CN211180379U - Zoom lens for projection and projection display device - Google Patents
Zoom lens for projection and projection display device Download PDFInfo
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- CN211180379U CN211180379U CN201890000524.2U CN201890000524U CN211180379U CN 211180379 U CN211180379 U CN 211180379U CN 201890000524 U CN201890000524 U CN 201890000524U CN 211180379 U CN211180379 U CN 211180379U
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/16—Optical objectives specially designed for the purposes specified below for use in conjunction with image converters or intensifiers, or for use with projectors, e.g. objectives for projection TV
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- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/22—Telecentric objectives or lens systems
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- G—PHYSICS
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- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B15/00—Optical objectives with means for varying the magnification
- G02B15/14—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective
- G02B15/16—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective with interdependent non-linearly related movements between one lens or lens group, and another lens or lens group
- G02B15/20—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective with interdependent non-linearly related movements between one lens or lens group, and another lens or lens group having an additional movable lens or lens group for varying the objective focal length
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Abstract
The utility model provides a seek miniaturization, F value little and reduce the side for telecentric, and ensured high zoom ratio and high peripheral light quantity than high performance zoom lens for projection and have this zoom lens for projection's projection type display device. The projection zoom lens includes, in order from the magnification side, a negative first lens group, a positive second lens group, a negative third lens group, a positive fourth lens group, a diaphragm, a fifth lens group, and a positive sixth lens group. When the zooming is performed, the first lens group and the sixth lens group are fixed, and other lens groups move. The cemented lens disposed on the most diminished side in the range from the surface on the most magnified side to the surface on the most diminished side of the second lens group is formed by sequentially joining a biconcave lens and a biconvex lens from the magnified side and has positive refractive power. Satisfying a predetermined conditional expression.
Description
Technical Field
The present invention relates to a zoom lens for projection and a projection display device, and more particularly, to a zoom lens for projection suitable for enlarging and projecting a light flux carrying video information from a light valve onto a screen, and a projection display device using the zoom lens for projection.
Background
Conventionally, projection display devices that enlarge and project an image displayed on a light valve such as a liquid crystal display element or a DMD (Digital Micromirror Device: registered trademark) onto a screen or the like have been widely used. For example, a projection type display device having the following structure is used: the three light valves are used and are respectively associated with illumination light of three primary colors of red, green, and blue, and the lights modulated by the respective light valves are combined by a color combining prism or the like to project an image via a projection lens.
In recent years, as the performance of light valves has been improved, a projection lens used together with a light valve is required to obtain good aberration correction commensurate with the resolution of the light valve. Further, there is a tendency to demand a lens system configured to be compact and have a wider angle. Further, from the viewpoint of the installation property, a lens system having a magnification-varying function is preferable.
As a lens system having a zoom function which can be applied to a projection type display device, for example, the techniques described in japanese patent application laid-open nos. 2010-282147 and 2010-261976 have been proposed. Jp 2010-282147 a and jp 2010-261976 a describe zoom lenses as follows: the lens group closest to the enlargement side and the lens group closest to the reduction side are fixed at the time of magnification change, and 3 or 4 lens groups that move at the time of magnification change are arranged between these lens groups.
Disclosure of Invention
Technical problem to be solved by the invention
Since the color synthesis prism changes the spectral characteristics according to the angle of incident light, it is desirable to make the reduction side telecentric for a projection lens used in combination with the color synthesis prism. In addition, in view of improving the degree of freedom in setting the distance from the screen, the installation in the indoor space, and the versatility, there is a high demand for a projection lens having a small size and a high zoom ratio. Further, it is also desirable that the projection lens has a small F value.
On the other hand, in the projection display device, it is desired to reduce the difference in illuminance between the center and the peripheral portion of the image projected on the screen. The ratio of the light amount of a point on the optical axis of the image to the light amount of a point on the optical axis of the image is called the peripheral light amount ratio, and a projection lens capable of securing a high peripheral light amount ratio is desired.
However, in order to sufficiently satisfy recent requirements, it is preferable to further increase the zoom ratio as the lens system described in japanese patent application laid-open No. 2010-282147. In the lens system described in jp 2010-261976 a, in order to secure a high zoom ratio and a high peripheral light amount ratio while maintaining a small F value and telecentricity on the reduction side, it is necessary to set the position of the diaphragm closer to the reduction side.
The present invention has been made in view of the above circumstances, and an object thereof is to provide a zoom lens for projection which is miniaturized, has a small F value, is configured to be telecentric on the reduction side, ensures a high zoom ratio and a high peripheral light amount ratio, and has excellent optical performance, and a projection display device including the zoom lens for projection.
Means for solving the technical problem
A zoom lens for projection of the present invention is a zoom lens for projection, which is constituted by, in order from an enlargement side, a first lens group having negative power, a second lens group having positive power, a third lens group having negative power, a fourth lens group having positive power, a stop, a fifth lens group, and a sixth lens group having positive power, wherein the first lens group and the sixth lens group are fixed with respect to an image forming surface on a reduction side at the time of magnification change, the second lens group, the third lens group, the fourth lens group, and the fifth lens group are moved by changing an interval in an optical axis direction with respect to adjacent lens groups, the reduction side is telecentric, at least one cemented lens is included from a lens surface closest to the enlargement side to a lens surface closest to the reduction side of the second lens group, and, of at least one cemented lens included from the lens surface closest to the enlargement side to the lens surface closest to the reduction side of the second lens group, a cemented lens closest to the reduction side is formed by sequentially joining a biconcave lens and a biconvex lens from the enlargement side to the bicon When the combined focal length of all lenses closer to the enlargement side than the meniscus lens at the wide-angle end is ffc and the focal length of the entire system at the wide-angle end is fw, the following conditional expression (1) is satisfied,
1＜|ffc/fw|＜2 (1)
when the distance between the focal position on the enlargement side of the lens group obtained by combining the fifth lens group and the sixth lens group at this time and the base point on the optical axis is dd56, and the effective image circle diameter on the reduction side of the entire system is Im Φ, the following conditional expression (2) is satisfied in at least a part of the variable magnification region from the wide angle end to the telephoto end,
-0.7＜dd56/ImΦ＜3 (2)
when the maximum value of the focal length of the entire system in the variable magnification region satisfying the conditional expression (2) is fdmax and the minimum value of the focal length of the entire system in the variable magnification region satisfying the conditional expression (2) is fdmin, the following conditional expression (3) is satisfied,
1.35＜fdmax/fdmin＜2 (3)
the fifth lens group has a lens component having positive refractive power on the most diminished side, and satisfies the following conditional expression (4) when the focal length of the lens component is fg5e,
3.6＜fg5e/fw＜6 (4)。
in the zoom lens for projection of the present invention, at least one of the following conditional expressions (1-1) to (4-1) is preferably satisfied.
1＜|ffc/fw|＜1.6 (1-1)
-0.5＜dd56/ImΦ＜2 (2-1)
1.45＜fdmax/fdmin＜2 (3-1)
4＜fg5e/fw＜6 (4-1)
In the projection zoom lens of the present invention, it is preferable that the following conditional expression (5) is satisfied, and more preferable that the following conditional expression (5-1) is satisfied, where fG56 is a combined focal length of the fifth lens group and the sixth lens group at the wide-angle end and fw is a focal length of the entire system at the wide-angle end.
2＜fG56/fw＜5 (5)
2＜fG56/fw＜4 (5-1)
In the zoom lens for projection according to the present invention, when the maximum diameter of the light flux at the maximum angle of view at the aperture position is Φ y, the maximum diameter of the on-axis light flux at the aperture position is Φ c, and the minimum value of Φ y/Φ c in the entire zoom region is (Φ y/Φ c) min, the following conditional expression (6) is preferably satisfied, and the following conditional expression (6-1) is more preferably satisfied.
0.8＜(Φy/Φc)min≤1 (6)
0.85＜(Φy/Φc)min≤1 (6-1)
In the zoom lens for projection according to the present invention, when the diameter of the effective image circle on the reduction side of the entire system is represented by Im Φ, and the distance on the optical axis from the lens surface closest to the enlargement side to the lens surface closest to the reduction side is represented by L, the following conditional expression (7) is preferably satisfied, and the following conditional expression (7-1) is more preferably satisfied.
0.08＜ImΦ/L＜0.15 (7)
0.1＜ImΦ/L＜0.15 (7-1)
In the zoom lens for projection according to the present invention, when the maximum F value in the entire zoom region of the zoom lens for projection is FNomax, the following conditional expression (8) is preferably satisfied, and the following conditional expression (8-1) is more preferably satisfied.
1.2＜FNomax＜3 (8)
1.5＜FNomax＜3 (8-1)
In the zoom lens for projection according to the present invention, it is preferable that the aperture diameter of the aperture is variable.
A projection display device of the present invention includes: a light source; a light valve to which light from the light source is incident; and the zoom lens for projection of the present invention described above as a zoom lens for projection that projects an optical image formed by light modulated by the light valve onto a screen.
Further, the above-mentioned "enlargement side" means a projected side (screen side), and in the case of performing reduction projection, the screen side is also referred to as an enlargement side for convenience. On the other hand, the "reduction side" means the original image display region side (light valve side), and when performing reduction projection, the light valve side is also referred to as the reduction side for convenience.
The "consisting of" means a substantial structure, and may include optical components other than lenses having substantially no optical power, such as a diaphragm, a mask (mask), a cover glass, and/or a filter, in addition to the elements listed as the constituent elements.
The above-mentioned "the reduction side is telecentric" means that the bisector angle line of the upper maximum ray and the lower maximum ray in the cross section of the light beam converged to an arbitrary point on the reduction side image plane is close to a state parallel to the optical axis, and is not limited to the case of complete telecentricity, that is, the case where the bisector angle line is completely parallel to the optical axis, which means that some errors are included. Here, the case where there is some error is a case where the inclination of the bisector line with respect to the optical axis is in the range of-3 ° to +3 °.
The "lens group" described above does not necessarily have to be a lens group including a plurality of lenses, and includes a lens group including only one lens. Further, "lens component" means a lens in which the air contact surface on the optical axis is only two surfaces, that is, the enlargement side surface and the reduction side surface, and one lens component means one single lens or one cemented lens. "Φ y" and "Φ c" are diameters in a direction perpendicular to the optical axis.
The power of each lens group is represented by the power of the entire corresponding lens group. The sign of the refractive power of the lens group, the sign of the refractive power of the lens, and the surface shape of the lens are considered to be in the paraxial region for a lens including an aspherical surface. The above conditions are all related to the d-line (wavelength 587.6nm (nm)) at a projection distance of infinity.
Effects of the invention
According to the present invention, in the zoom lens having the 6-group structure, by appropriately setting the power arrangement, the aperture position, and the like and satisfying a predetermined conditional expression, it is possible to provide a zoom lens for projection which is miniaturized, has a small F-number, is telecentric on the reduction side, ensures a high zoom ratio and a high peripheral light quantity ratio, and has excellent optical performance, and a projection display device having the zoom lens for projection.
Drawings
Fig. 1 is a cross-sectional view showing a structure and light beams of a zoom lens for projection according to embodiment 1 of the present invention.
Fig. 2 is a cross-sectional view showing a structure and light beams of a zoom lens for projection according to embodiment 2 of the present invention.
Fig. 3 is a cross-sectional view showing a structure and light beams of a zoom lens for projection according to embodiment 3 of the present invention.
Fig. 4 is a cross-sectional view showing a structure and light beams of a zoom lens for projection according to embodiment 4 of the present invention.
Fig. 5 is a cross-sectional view showing a structure and light beams of a zoom lens for projection according to embodiment 5 of the present invention.
Fig. 6 is a cross-sectional view showing a structure and light beams of a zoom lens for projection according to embodiment 6 of the present invention.
Fig. 7 is a cross-sectional view showing a structure and light beams of a zoom lens for projection according to embodiment 7 of the present invention.
Fig. 8 is a cross-sectional view showing a structure and light beams of a zoom lens for projection according to embodiment 8 of the present invention.
Fig. 9 is a cross-sectional view showing a structure and light beams of a zoom lens for projection according to embodiment 9 of the present invention.
Fig. 10 is a cross-sectional view showing a structure and light beams of a zoom lens for projection according to embodiment 10 of the present invention.
Fig. 11 is each aberration diagram of the zoom lens for projection according to embodiment 1 of the present invention, the upper stage being an aberration diagram in the wide-angle end state, the middle stage being an aberration diagram in the intermediate focal length state, and the lower stage being an aberration diagram in the telephoto end state, and the aberration diagrams in each state being a spherical aberration diagram, an astigmatism diagram, a distortion aberration diagram, and a magnification chromatic aberration diagram in this order from the left side.
Fig. 12 is each aberration diagram of the zoom lens for projection according to embodiment 2 of the present invention, the upper stage being an aberration diagram in the wide-angle end state, the middle stage being an aberration diagram in the intermediate focal length state, and the lower stage being an aberration diagram in the telephoto end state, and the aberration diagrams in each state being a spherical aberration diagram, an astigmatism diagram, a distortion aberration diagram, and a magnification chromatic aberration diagram in this order from the left side.
Fig. 13 is each aberration diagram of the zoom lens for projection according to embodiment 3 of the present invention, the upper stage being an aberration diagram in the wide-angle end state, the middle stage being an aberration diagram in the intermediate focal length state, and the lower stage being an aberration diagram in the telephoto end state, and the aberration diagrams in each state being a spherical aberration diagram, an astigmatism diagram, a distortion aberration diagram, and a magnification chromatic aberration diagram in this order from the left side.
Fig. 14 is each aberration diagram of the zoom lens for projection according to embodiment 4 of the present invention, the upper stage being an aberration diagram in the wide-angle end state, the middle stage being an aberration diagram in the intermediate focal length state, and the lower stage being an aberration diagram in the telephoto end state, and the aberration diagrams in each state being a spherical aberration diagram, an astigmatism diagram, a distortion aberration diagram, and a magnification chromatic aberration diagram in this order from the left side.
Fig. 15 is each aberration diagram of the zoom lens for projection according to embodiment 5 of the present invention, the upper stage being an aberration diagram in the wide-angle end state, the middle stage being an aberration diagram in the intermediate focal length state, and the lower stage being an aberration diagram in the telephoto end state, and the aberration diagrams in each state being a spherical aberration diagram, an astigmatism diagram, a distortion aberration diagram, and a magnification chromatic aberration diagram in this order from the left side.
Fig. 16 is each aberration diagram of the zoom lens for projection according to embodiment 6 of the present invention, the upper stage being an aberration diagram in the wide-angle end state, the middle stage being an aberration diagram in the intermediate focal length state, and the lower stage being an aberration diagram in the telephoto end state, and the aberration diagrams in each state being a spherical aberration diagram, an astigmatism diagram, a distortion aberration diagram, and a magnification chromatic aberration diagram in this order from the left side.
Fig. 17 is each aberration diagram of the zoom lens for projection according to embodiment 7 of the present invention, the upper stage being an aberration diagram in the wide-angle end state, the middle stage being an aberration diagram in the intermediate focal length state, and the lower stage being an aberration diagram in the telephoto end state, and the aberration diagrams in each state being a spherical aberration diagram, an astigmatism diagram, a distortion aberration diagram, and a magnification chromatic aberration diagram in this order from the left side.
Fig. 18 is each aberration diagram of the zoom lens for projection according to embodiment 8 of the present invention, the upper stage being an aberration diagram in the wide-angle end state, the middle stage being an aberration diagram in the intermediate focal length state, and the lower stage being an aberration diagram in the telephoto end state, and the aberration diagrams in each state being a spherical aberration diagram, an astigmatism diagram, a distortion aberration diagram, and a magnification chromatic aberration diagram in this order from the left side.
Fig. 19 is each aberration diagram of the zoom lens for projection according to embodiment 9 of the present invention, the upper stage being an aberration diagram in the wide-angle end state, the middle stage being an aberration diagram in the intermediate focal length state, and the lower stage being an aberration diagram in the telephoto end state, and the aberration diagrams in each state being a spherical aberration diagram, an astigmatism diagram, a distortion aberration diagram, and a magnification chromatic aberration diagram in this order from the left side.
Fig. 20 is each aberration diagram of the zoom lens for projection according to embodiment 10 of the present invention, the upper stage being an aberration diagram in the wide-angle end state, the middle stage being an aberration diagram in the intermediate focal length state, and the lower stage being an aberration diagram in the telephoto end state, and the aberration diagrams in each state being a spherical aberration diagram, an astigmatism diagram, a distortion aberration diagram, and a magnification chromatic aberration diagram in this order from the left side.
Fig. 21 is a schematic configuration diagram of a projection display device according to an embodiment of the present invention.
Detailed Description
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. Fig. 1 shows a configuration of a zoom lens for projection and a cross-sectional view of a light beam according to an embodiment of the present invention. The example shown in fig. 1 corresponds to the zoom lens of embodiment 1 described later. In fig. 1, the left side of the paper is an enlarged side, and the right side of the paper is a reduced side, and represents a state of focusing on an infinitely distant object.
In fig. 1, the WIDE-angle end state is shown in the upper stage denoted by "WIDE", the on-axis light beam wa, the light beam wb at an intermediate viewing angle, and the light beam wc at a maximum viewing angle are described as light beams, the intermediate focal length state is shown in the middle stage denoted by "MIDD L E", the on-axis light beam ma, the light beam mb at an intermediate viewing angle, and the light beam mc at a maximum viewing angle are described as light beams, the telephoto end state is shown in the lower stage denoted by "TE L E", the on-axis light beam ta, the light beam tb at an intermediate viewing angle, and the light beam tc. at a maximum viewing angle are described as light beams, arrows indicating the approximate moving directions of the lens groups moving when zooming from the WIDE-angle end to the intermediate focal length state are shown between the upper stage and the middle stage, and arrows indicating the approximate moving directions of the lens groups moving when zooming from the intermediate focal length state to the telephoto end are shown between the middle stage and the lower stage.
The zoom lens for projection may be mounted on a projection display device, for example, and used as a zoom lens for projection that projects image information displayed on a light valve onto a screen. In fig. 1, a case where the display device is mounted on a projection display device is assumed, and an image display surface Sim of an optical member PP assumed to be a filter, a prism, or the like and a light valve positioned on a reduction-side surface of the optical member PP is also illustrated. In the example of fig. 1, the image display surface Sim corresponds to a reduction-side imaging surface.
In fig. 1, an example is shown in which the position of the reduction-side surface of the optical member PP coincides with the position of the image display surface Sim, but the present invention is not necessarily limited to this. In fig. 1, only one image display surface Sim is shown for simplification of the drawing, but in a projection display device, a light flux from a light source may be separated into three primary colors by a dichroic optical system, and three light valves may be provided for each primary color, thereby displaying a full color image.
The zoom lens for projection is composed of, in order from the enlargement side toward the reduction side along the optical axis Z, a first lens group G1 having negative power, a second lens group G2 having positive power, a third lens group G3 having negative power, a fourth lens group G4 having positive power, an aperture stop St, a fifth lens group G5 having positive power or negative power, and a sixth lens group G6 having positive power. At the time of magnification change, the first lens group G1 and the sixth lens group G6 are fixed with respect to the reduction-side image formation surface, and the second lens group G2, the third lens group G3, the fourth lens group G4, and the fifth lens group G5 are moved by changing the interval in the optical axis direction with the adjacent lens groups.
By adopting the 6-group configuration as described above, it is advantageous to suppress aberration variation at the time of magnification variation. By setting the first lens group G1 closest to the magnification side as a negative lens group, a wider angle of view is facilitated. In addition, by moving the positive second lens group G2, the negative third lens group G3, the positive fourth lens group G4, and the fifth lens group G5 at the time of magnification change, it is possible to realize a small F value required for a lens system for projection, and to realize a high zoom ratio while keeping a small outer diameter of the lens on the magnification side. By disposing the aperture stop St between the fourth lens group G4 and the fifth lens group G5, the peripheral light amount ratio is easily ensured.
In the example shown in fig. 1, the first lens group G1 is composed of four lenses of the lenses L11 to L14 in order from the magnified side, the second lens group G2 is composed of three lenses of the lenses L21 to L23 in order from the magnified side, the third lens group G3 is composed of only one lens of the lenses L31, the fourth lens group G4 is composed of two lenses of the lenses L41 to L42 in order from the magnified side, the fifth lens group G5 is composed of six lenses of the lenses L51 to L56 in order from the magnified side, and the sixth lens group G6 is composed of only one lens of the lenses L61, however, each lens group of the zoom lens for projection of the present invention may be composed of lenses having a number different from that of the example shown in fig. 1.
The reduction side of the zoom lens for projection is telecentric so as to meet the required specifications of a projection lens used in combination with a color synthesis prism.
In the following description, the cemented lens disposed at the above-described position and having the above-described configuration is referred to as a meniscus cemented lens CE in the example of fig. 1, the meniscus cemented lens CE is composed of a cemented lens L and a lens L22, and the meniscus cemented lens CE is disposed from the lens surface on the most enlargement side to the lens surface on the most reduction side of the second lens group G2, whereby chromatic aberration of magnification is easily corrected and an image plane is corrected while a wide angle of view is realized.
The meniscus lens CE is formed by joining a biconcave lens and a biconvex lens in this order from the enlargement side, and the entire cemented lens is a meniscus lens with a concave surface facing the enlargement side. Here, an attempt is made to compare a cemented lens, which is a cemented lens formed by a negative meniscus lens and a biconvex lens having the same refractive power as the meniscus cemented lens CE and having convex surfaces facing the enlargement side in this order from the enlargement side, that is, a cemented lens having a biconvex shape as a whole, with the meniscus cemented lens CE. The height of the cemented lens having a shape such as the meniscus cemented lens CE on the lens surface on the enlargement side of the light beam incident from the reduction side and emitted to the enlargement side is lower than the height of the cemented lens having a biconvex shape as a whole. Therefore, when considering the diameter of the lens positioned on the enlargement side of the cemented lens, the cemented lens having a shape such as the meniscus lens CE can suppress the diameter of the lens positioned on the enlargement side more than the cemented lens having a biconvex shape as a whole, and can be further miniaturized. Further, since the meniscus lens CE has positive refractive power as a whole, the light flux emitted to the enlargement side acts so as to be focused on the optical axis side, and therefore, it is easy to further reduce the diameter of the lens on the enlargement side.
The projection zoom lens is configured to satisfy the following conditional expression (1) when a focal length of the entire system at the wide-angle end is fw and a combined focal length of all lenses on the magnification side of the meniscus lens CE at the wide-angle end is ffc. By setting to be higher than the lower limit of conditional expression (1), it is easy to suppress the lens diameter on the magnification side while securing the angle of view at the wide-angle end and realizing a high zoom ratio. By setting the upper limit lower than the conditional expression (1), it is easy to correct the field curvature and the chromatic aberration of magnification with good balance. In order to enhance the effect of the conditional expression (1), the following conditional expression (1-1) is preferably satisfied, and the following conditional expression (1-2) is more preferably satisfied.
1＜|ffc/fw|＜2 (1)
1＜|ffc/fw|＜1.6 (1-1)
1＜|ffc/fw|＜1.4 (1-2)
Further, when the distance on the optical axis between the enlargement side focal position of the lens group obtained by combining the fifth lens group G5 and the sixth lens group G6 and the base point is dd56, and the effective image circle diameter on the reduction side of the entire system is Im Φ, with the enlargement side being negative and the reduction side being positive with respect to the base point of the lens surface on the most reduction side of the fourth lens group G4, the projection zoom lens is configured to satisfy the following conditional expression (2) in at least a part of the variable magnification region from the wide angle end to the telephoto end. By setting the lower limit higher than the conditional expression (2), the peripheral light amount ratio can be easily secured. By setting the upper limit lower than the conditional expression (2), the total length of the lens system can be easily suppressed. In order to enhance the effect of the conditional expression (2), the following conditional expression (2-1) is preferably satisfied, and the following conditional expression (2-2) is more preferably satisfied, in at least a part of the variable magnification region from the wide-angle end to the telephoto end.
-0.7＜dd56/ImΦ＜3 (2)
-0.5＜dd56/ImΦ＜2 (2-1)
-0.4＜dd56/ImΦ＜2 (2-2)
In fig. 1, dd56 and Im Φ/2 are illustrated only in the wide-angle end state, and illustration of the portions in the intermediate focal length state and the telephoto end state is omitted.
When the minimum value of the focal length of the entire system in the variable magnification region satisfying the conditional expression (2) is fdmin and the maximum value of the focal length of the entire system in the variable magnification region satisfying the conditional expression (2) is fdmax, the zoom lens for projection satisfies the following conditional expression (3). By setting the lower limit higher than the conditional expression (3), the zoom ratio required for the zoom lens for projection is obtained while easily securing the peripheral light amount ratio. By setting the total length of the lens system to be lower than the upper limit of the conditional expression (3), the total length of the lens system can be prevented from increasing and the number of lenses can be prevented from increasing. In order to enhance the effect of the conditional expression (3), the following conditional expression (3-1) is preferably satisfied.
1.35＜fdmax/fdmin＜2 (3)
1.45＜fdmax/fdmin＜2 (3-1)
Further, the projection zoom lens is configured to satisfy the following conditional expression (4) when the fifth lens group G5 has a lens component having positive refractive power on the most diminished side, the focal length of the lens component is fg5e, and the focal length of the entire system at the wide-angle end is fw. By setting the lower limit higher than the conditional expression (4), the power with respect to the off-axis light does not become excessively strong, and the increase in the lens diameter of the lens group that moves at the time of magnification on the magnification side with respect to the aperture stop St can be suppressed. By setting the upper limit of conditional expression (4) to be lower, the variation in field curvature and chromatic aberration of magnification at the time of magnification change can be easily corrected with good balance. In order to enhance the effect of the conditional expression (4), the following conditional expression (4-1) is preferably satisfied, and the following conditional expression (4-2) is more preferably satisfied.
3.6＜fg5e/fw＜6 (4)
4＜fg5e/fw＜6 (4-1)
4＜fg5e/fw＜5 (4-2)
In the projection zoom lens, it is preferable that the following conditional expression (5) is satisfied, where fG56 is a combined focal length of the fifth lens group G5 and the sixth lens group G6 at the wide-angle end, and fw is a focal length of the entire system at the wide-angle end. By setting the lower limit higher than the conditional expression (5), the power with respect to the off-axis light does not become excessively strong, and the increase in the lens diameter of the lens group that moves at the time of magnification on the magnification side with respect to the aperture stop St can be suppressed. By setting the upper limit lower than the conditional expression (5), the total length of the lens system can be easily suppressed. In order to enhance the effect of the conditional expression (5), the following conditional expression (5-1) is more preferably satisfied.
2＜fG56/fw＜5 (5)
2＜fG56/fw＜4 (5-1)
In the zoom lens for projection, it is preferable that the following conditional expression (6) is satisfied, where Φ y represents the maximum diameter of the light flux at the maximum angle of view at the position of the aperture stop St, Φ c represents the maximum diameter of the on-axis light flux at the position of the aperture stop St, and (Φ y/Φ c) min represents the minimum value of Φ y/Φ c in the entire zoom region. In addition, the on-axis light beam means a light beam having a viewing angle of 0 °. Since the maximum value of Φ y/Φ c is 1 optically, the upper limit of conditional expression (6) is 1. By setting the lower limit higher than the conditional expression (6), a high peripheral light amount ratio can be ensured. In order to enhance the effect of conditional expression (6), it is more preferable that the following conditional expression (6-1) is satisfied.
0.8＜(Φy/Φc)min≤1 (6)
0.85＜(Φy/Φc)min≤1 (6-1)
In the zoom lens for projection, it is preferable that the following conditional expression (7) is satisfied when the effective image circle diameter on the reduction side of the entire system is Im Φ and the distance on the optical axis from the lens surface closest to the enlargement side to the lens surface closest to the reduction side is L, the total length of the lens system is easily suppressed by setting the lower limit of the conditional expression (7) higher, the total length of the lens system is suppressed from increasing and the number of lenses is increased by setting the lower limit of the conditional expression (7), and in order to improve the effect of the conditional expression (7), the following conditional expression (7-1) is more preferably satisfied, and the following conditional expression (7-2) is still more preferably satisfied.
0.08＜ImΦ/L＜0.15 (7)
0.1＜ImΦ/L＜0.15 (7-1)
0.1＜TmΦ/L＜0.13 (7-2)
When the maximum F value in the entire zoom region of the zoom lens for projection is ENomax, the following conditional expression (8) is preferably satisfied. By setting the lower limit higher than the conditional expression (8), the total length of the lens system can be prevented from increasing and the number of lenses can be prevented from increasing. By setting the lower limit than the upper limit of conditional expression (8), a small F value required as a projection lens to be mounted on a projection display device can be secured. In order to enhance the effect of the conditional expression (8), the following conditional expression (8-1) is more preferably satisfied, and the following conditional expression (8-2) is still more preferably satisfied.
1.2＜FNomax＜3 (8)
1.5＜FNomax＜3 (8-1)
1.6＜FNomax＜3 (8-2)
It is preferable that both of conditional expression (6) and conditional expression (8) are satisfied. It is easy to configure to satisfy the conditional expression (6) in a lens system having a large F value, but it is difficult to obtain a clear image in such a lens system. By satisfying both the conditional expression (6) and the conditional expression (8), it is possible to secure a high peripheral light intensity ratio while securing a small F value required for a projection lens, and it is easy to obtain a clear projection image from the center to the peripheral portion of the screen.
In addition, it is preferable that the aperture diameter of the aperture stop St of the zoom lens for projection is variable. With such an arrangement, it is easy to make the F value constant at the time of magnification change. Further, the aperture stop St may be moved by changing the interval in the optical axis direction with the adjacent lens group at the time of magnification change, or may be moved integrally with any one of the fourth lens group G4 and the fifth lens group G5 at the time of magnification change.
In the zoom lens for projection, focusing may be performed by moving the entire first lens group G1 or a part of the lenses of the first lens group G1 in the optical axis direction.
The above-described preferred configurations and possible configurations may be arbitrarily combined, and are preferably selectively employed as appropriate in accordance with the required specifications. According to the present embodiment, a zoom lens for projection that is miniaturized, has a small F value, is configured to be telecentric on the reduction side, ensures a high zoom ratio and a high peripheral light amount ratio, and has good optical performance can be realized. Here, "small F value" means an F value of less than 3, and "high zoom ratio" means a zoom ratio of more than 1.35.
Next, numerical embodiments of the zoom lens for projection according to the present invention will be described. In addition, the numerical data of the examples shown below are normalized so that the focal length of the entire system at the wide-angle end becomes 10.00 when the projection distance is infinity, and are each a value obtained by rounding off the focal length by a predetermined number of bits.
[ example 1]
The zoom lens for projection of embodiment 1 has a 6-group structure in which a first lens group G1 having negative refractive power, a second lens group G2 having positive refractive power, a third lens group G3 having negative refractive power, a fourth lens group G4 having positive refractive power, an aperture stop St, a fifth lens group G5 having positive refractive power, and a sixth lens group G6. having positive refractive power are arranged in this order from the magnification side, the first lens group G1 and the sixth lens group G6 are fixed at the time of magnification change, the second lens group G2 to the fifth lens group G5 are moved by changing the interval in the optical axis direction with the adjacent lens groups, and focusing is performed by moving only the lens L14 in the optical axis direction, as shown in fig. 1, and the method and structure thereof are as the example shown in fig. 1, and therefore, a part of the description will be omitted.
Basic lens data of the zoom lens for projection of embodiment 1 is shown in table 1, and technical parameters and variable surface intervals are shown in table 2. In table 1, the column Si shows the surface number of the i-th surface (i is 1, 2, 3, …) when the enlarged surface of the component element closest to the enlarged side is designated as the 1 st surface and the surface numbers of the component elements are added so as to increase in order toward the reduced side, the column Ri shows the radius of curvature of the i-th surface, and the column Di shows the surface interval between the i-th surface and the i + 1-th surface on the optical axis Z. In table 1, the column Ndj shows the refractive index of the j-th component element (j: 1, 2, 3, …) that increases in order toward the reduction side with the component element closest to the enlargement side being the 1 st component element, with respect to the d-line (wavelength 587.6nm (nm)), and the column ν dj shows the abbe number of the d-line standard of the j-th component element. In the column of the glass material name (manufacturer) in table 1, the names of the glass types of the constituent elements are shown outside the parentheses, and the manufacturer names are shown inside the parentheses. The manufacturer name is represented by OHARA, ohya, and HOYA.
Here, the sign of the curvature radius is positive for the component of the surface shape of the convex surface toward the enlargement side, and negative for the component of the surface shape of the convex surface toward the reduction side. Table 1 also shows the aperture stop St and the optical member PP. In table 1, the term (St) is also written in the column of the surface number corresponding to the surface of the aperture stop St. The value of the lowermost column of Di is the interval between the face closest to the reduction side in the table and the image display face Sim. In table 1, a mark such as DD [ ] is used for the variable surface interval, and the surface number on the enlarged side of the interval is added to [ ] and is shown in the Di column.
In table 2, the values of the zoom ratio Zr, the focal length F of the entire system, the F value fno, the maximum full view angle 2 ω, and the variable plane spacing are shown with the d line as a standard (°) means the unit is degrees in table 2, the respective values of the WIDE-angle end state, the intermediate focal length state, and the telephoto end state are shown in the columns denoted WIDE, mid L E, and TE L E, respectively, in table 2, the values of table 1 and table 2 are values when the projection distance is infinite.
[ Table 1]
Example 1
| Si | Ri | Di | Ndj | νdj | Name of glass Material (manufacturer) |
| 1 | 34.8258 | 5.010 | 1.77250 | 49.62 | TAF1(HOYA) |
| 2 | 103.4918 | 0.143 | |||
| 3 | 26.6497 | 1.100 | 1.67790 | 55.34 | S-LAL12(OHARA) |
| 4 | 14.4720 | 5.097 | |||
| 5 | 59.4717 | 1.004 | 1.77250 | 49.62 | TAF1(HOYA) |
| 6 | 17.1032 | 5.662 | |||
| 7 | -40.9901 | 0.885 | 1.85150 | 40.78 | S-LAH89(OHARA) |
| 8 | 36.5673 | DD[8] | |||
| 9 | -50.9620 | 1.004 | 1.80518 | 25.46 | FD60-W(HOYA) |
| 10 | 34.7336 | 6.338 | 1.77250 | 49.62 | TAF1(HOYA) |
| 11 | -30.0945 | 3.953 | |||
| 12 | 57.3053 | 3.707 | 1.80518 | 25.46 | FD60-W(HOYA) |
| 13 | -63.9020 | DD[13] | |||
| 14 | -49.7784 | 1.052 | 1.51680 | 64.20 | BSC7(HOYA) |
| 15 | -100.8533 | DD[15] | |||
| 16 | 42.8827 | 6.855 | 1.49700 | 81.61 | FCD1(HOYA) |
| 17 | -18.2829 | 1.033 | 1.62004 | 36.26 | S-TIM2(OHARA) |
| 18 | -31.8584 | DD[18] | |||
| 19(St) | ∞ | 5.016 | |||
| 20 | 19.2632 | 0.622 | 1.59551 | 39.24 | S-TIM8(OHARA) |
| 21 | 12.8717 | 2.638 | |||
| 22 | -13.2785 | 0.674 | 1.51742 | 52.43 | S-NSL36(OHARA) |
| 23 | 17.4861 | 5.902 | 1.49700 | 81.61 | FCD1(HOYA) |
| 24 | -9.8879 | 0.765 | 1.80400 | 46.58 | S-LAH65V(OHARA) |
| 25 | -15.6295 | 0.143 | |||
| 26 | 76.9337 | 5.605 | 1.49700 | 81.61 | FCD1(HOYA) |
| 27 | -12.4807 | 0.866 | 1.51742 | 52.43 | S-NSL36(OHARA) |
| 28 | -27.0061 | DD[28] | |||
| 29 | 32.1460 | 4.799 | 1.49700 | 81.61 | FCD1(HOYA) |
| 30 | -45.4376 | 8.211 | |||
| 31 | ∞ | 13.600 | 1.51633 | 64.14 | S-BSL7(OHARA) |
| 32 | ∞ | 0.000 |
[ Table 2]
Example 1
| WIDE | middle | TELE | |
| Zr | 1.00 | 1.22 | 1.52 |
| f | 10.00 | 12.20 | 15.20 |
| FNo. | 2.50 | 2.50 | 2.50 |
| 2ω(°) | 63.4 | 53.8 | 44.4 |
| DD[8] | 9.131 | 5.906 | 3.362 |
| DD[13] | 6.595 | 10.972 | 8.039 |
| DD[15] | 14.572 | 5.200 | 0.478 |
| DD[18] | 0.958 | 5.918 | 13.047 |
| DD[28] | 0.476 | 3.736 | 6.807 |
Fig. 11 shows respective aberration diagrams of the zoom lens for projection of embodiment 1 when the projection distance is 956.6, in fig. 11, spherical aberration, astigmatism, distortion aberration, and chromatic aberration of magnification are shown in order from the left side, in fig. 11, the upper stage denoted by WIDE represents the WIDE-angle end state, the middle stage denoted by MIDD L E represents the intermediate focal length state, and the lower stage denoted by TE L E represents the telephoto end state, in the spherical aberration diagram, aberrations at d-line (wavelength 587.6nm (nm)), C-line (wavelength 656.3nm (nm)), and F-line (wavelength 486.1 nm)) are shown by black solid line, long broken line, and short broken line, respectively, in the astigmatism diagram, the aberration at d-line in the sagittal direction is shown by solid line, the aberration at d-line in the meridional direction is shown by short broken line, in the distortion aberration diagram, the aberration at d-line is shown by solid line, and short broken line, respectively, in the magnification diagram, the aberration at C-line, and F-line are shown by long broken line, and short broken line, respectively, and half-angle aberration in the meridional direction means ω.
The notation, meaning, description method, and aberration diagram of each data described in the above description of embodiment 1 show aberration when the projection distance is 956.6, which is basically the same in the following embodiments 2 to 10. Note that the projection zoom lens has a 6-group configuration, and the lens groups that move during magnification change are the same in embodiments 2 to 10 below.
[ example 2]
In the zoom lens for projection of example 2, the first lens group G1 is constituted by four lenses of lenses L to L in order from the magnified side, the second lens group G2 is constituted by three lenses of lenses L021 to L in order from the magnified side, the third lens group G3 is constituted by only one lens of lens L, the fourth lens group G4 is constituted by one lens of lenses 6341 to L in order from the magnified side, the fifth lens group G68642 is constituted by only one lens of lens 6865 to lens L, the fifth lens group G7375 is constituted by only one lens of lens 8653 in order from the magnified side, and the first lens group G1 is constituted by only one lens of lens 8621 and the fifth lens group G8656 is constituted by one lens of lens 867 to lens 8653 in order from the magnified side, and the entire zoom lens group G8621 is constituted by only one lens of lens L and a zoom lens 8621 is joined to the sixth lens group G8656 in order from the magnified side.
Basic lens data of the zoom lens for projection of embodiment 2 is shown in table 3, technical parameters and variable surface intervals are shown in table 4, and respective aberration diagrams are shown in fig. 12.
[ Table 3]
Example 2
| Si | Ri | Di | Ndj | νdj | Name of glass Material (manufacturer) |
| 1 | 41.0565 | 4.136 | 1.77250 | 49.60 | S-LAH66(OHARA) |
| 2 | 124.5031 | 0.048 | |||
| 3 | 26.8966 | 1.100 | 1.58913 | 61.13 | S-BAL35(OHARA) |
| 4 | 14.1944 | 5.373 | |||
| 5 | 71.0974 | 0.957 | 1.77250 | 49.60 | S-LAH66(OHARA) |
| 6 | 17.4421 | 4.795 | |||
| 7 | -39.4864 | 0.909 | 1.77250 | 49.60 | S-LAH66(OHARA) |
| 8 | 44.7748 | DD[8] | |||
| 9 | -40.0464 | 1.004 | 1.80518 | 25.46 | FD60-W(HOYA) |
| 10 | 46.9146 | 6.573 | 1.74320 | 49.34 | S-LAM60(OHARA) |
| 11 | -28.1995 | 0.397 | |||
| 12 | 53.4913 | 3.589 | 1.80518 | 25.46 | FD60-W(HOYA) |
| 13 | -104.6292 | DD[13] | |||
| 14 | -40.1755 | 1.435 | 1.48749 | 70.24 | S-FSL5(OHARA) |
| 15 | -49.2134 | DD[15] | |||
| 16 | 47.4879 | 7.325 | 1.49700 | 81.54 | S-FPL51(OHARA) |
| 17 | -20.1308 | 1.028 | 1.65412 | 39.68 | S-NBH5(OHARA) |
| 18 | -33.3815 | DD[18] | |||
| 19(St) | ∞ | DD[19] | |||
| 20 | 17.6851 | 0.622 | 1.51742 | 52.43 | S-NSL36(OHARA) |
| 21 | 13.0194 | 3.535 | |||
| 22 | -11.7773 | 0.722 | 1.60342 | 38.03 | S-TIM5(OHARA) |
| 23 | 40.5846 | 4.137 | 1.49700 | 81.54 | S-FPL51(OHARA) |
| 24 | -15.7123 | 0.048 | |||
| 25 | 54.4239 | 3.139 | 1.49700 | 81.54 | S-FPL51(OHARA) |
| 26 | -31.2322 | DD[26] | |||
| 27 | 28.6360 | 3.924 | 1.49700 | 81.54 | S-FPL51(OHARA) |
| 28 | -48.2744 | 7.781 | |||
| 29 | ∞ | 13.600 | 1.51633 | 64.14 | S-BSL7(OHARA) |
| 30 | ∞ | 0.000 |
[ Table 4]
Example 2
| WIDE | middle | TELE | |
| Zr | 1.00 | 1.22 | 1.52 |
| f | 10.00 | 12.20 | 15.20 |
| FNo. | 2.50 | 2.50 | 2.50 |
| 2ω(°) | 64.2 | 54.4 | 44.8 |
| DD[8] | 10.311 | 7.122 | 4.501 |
| DD[13] | 15.722 | 19.226 | 2.787 |
| DD[15] | 10.019 | 0.478 | 8.192 |
| DD[18] | 1.068 | 7.615 | 16.165 |
| DD[19] | 7.778 | 7.783 | 7.821 |
| DD[26] | 2.164 | 4.837 | 7.596 |
[ example 3]
In the zoom lens for projection of example 3, the first lens group G1 is constituted by seven lenses of lenses 3611 to L in order from the magnified side, the second lens group G2 is constituted by only one lens of the lenses L021, the third lens group G3 is constituted by two lenses of the lenses L to L in order from the magnified side, the fourth lens group G4 is constituted by only one lens of the lenses 5841 to L in order from the magnified side, the fifth lens group G3 is constituted by only two lenses of the lenses L to L in order from the magnified side, the fifth lens group G4643 is constituted by only one lens of the lenses L to L, the fifth lens group G2 is constituted by only one lens of the lenses 4655 to L in order from the magnified side, the fifth lens group G6355 is constituted by only one lens of the lenses 4655 to 599, and the fifth lens group G5955 is constituted by only one lens of the lenses 4655 and the convex-94 is joined to the convex-94 lens L in order from the magnified side, and the fifth lens group G5955 is joined to the convex-94 lens L in order from the magnified side, and the convex-828653 is joined to the convex-constituted by the fifth lens group constituted by the convex-8294 and the convex-94 lens group constituted by the fifth lens 8456 in order from the magnification side.
Basic lens data of the zoom lens for projection of embodiment 3 is shown in table 5, technical parameters and variable surface intervals are shown in table 6, and respective aberration diagrams are shown in fig. 13.
[ Table 5]
Example 3
| Si | Ri | Di | Ndj | νdj | Name of glass Material (manufacturer) |
| 1 | 31.0039 | 5.500 | 1.77250 | 49.62 | TAF1(HOYA) |
| 2 | 81.4392 | 0.103 | |||
| 3 | 29.8927 | 0.990 | 1.77250 | 49.60 | S-AH66(OHARA) |
| 4 | 16.7719 | 3.705 | |||
| 5 | 36.1465 | 0.959 | 1.77250 | 49.60 | S-LAH66(OHARA) |
| 6 | 17.3227 | 4.960 | |||
| 7 | -76.3281 | 0.935 | 1.84666 | 23.78 | S-TIH53W(OHARA) |
| 8 | 28.4657 | 2.068 | |||
| 9 | ∞ | 0.772 | 1.49700 | 81.54 | S-FPL51(OHARA) |
| 10 | 48.6693 | 5.029 | |||
| 11 | -28.6360 | 0.773 | 1.57099 | 50.80 | S-BAL2(OHARA) |
| 12 | 41.5714 | 6.230 | 1.77250 | 49.60 | S-LAH66(OHARA) |
| 13 | -27.9430 | DD[13] | |||
| 14 | 132.8650 | 2.492 | 1.80610 | 33.27 | NBFD15-W(HOYA) |
| 15 | -97.1286 | DD[15] | |||
| 16 | 46.1660 | 4.797 | 1.62004 | 36.26 | S-TIM2(OHARA) |
| 17 | -35.2612 | 0.798 | 1.77250 | 49.62 | TAF1(HOYA) |
| 18 | 58.7663 | DD[18] | |||
| 19 | 27.9803 | 6.469 | 1.49700 | 81.61 | FCD1(HOYA) |
| 20 | -18.0395 | 0.803 | 1.57099 | 50.80 | S-BAL2(OHARA) |
| 21 | 77.4840 | 2.636 | 1.62299 | 58.16 | S-BSM15(OHARA) |
| 22 | -38.3069 | DD[22] | |||
| 23(St) | ∞ | 7.151 | |||
| 24 | 15.9896 | 0.634 | 1.75520 | 27.51 | S-TIH4(OHARA) |
| 25 | 12.6799 | 3.576 | |||
| 26 | -12.0831 | 0.629 | 1.61340 | 44.27 | S-NBM51(OHARA) |
| 27 | 29.2518 | 3.818 | 1.49700 | 81.61 | FCD1(HOYA) |
| 28 | -15.9020 | 0.431 | |||
| 29 | 54.3904 | 4.792 | 1.49700 | 81.61 | FCD1(HOYA) |
| 30 | -11.9801 | 0.867 | 1.51742 | 52.43 | S-NSL36(OHARA) |
| 31 | -33.5500 | DD[31] | |||
| 32 | 34.3448 | 2.875 | 1.49700 | 81.61 | FCD1(HOYA) |
| 33 | -40.8645 | 7.387 | |||
| 34 | ∞ | 13.600 | 1.51633 | 64.14 | S-BSL7(OHARA) |
| 35 | ∞ | 0.000 |
[ Table 6]
Example 3
| WIDE | middle | TELE | |
| Zr | 1.00 | 1.30 | 1.52 |
| f | 10.00 | 13.00 | 15.20 |
| FNo. | 2.48 | 2.48 | 2.48 |
| 2ω(°) | 63.8 | 51.0 | 44.6 |
| DD[13] | 15.375 | 5.527 | 1.179 |
| DD[15] | 0.994 | 17.278 | 22.188 |
| DD[18] | 20.723 | 6.444 | 0.335 |
| DD[22] | 0.239 | 3.535 | 5.982 |
| DD[31] | 4.163 | 8.710 | 11.809 |
[ example 4]
In the zoom lens for projection of embodiment 4, the first lens group G1 is composed of seven lenses of lenses 3611 to L in order from the magnified side, the second lens group G2 is composed of only one lens of a lens L021, the third lens group G3 is composed of two lenses of a lens L to L in order from the magnified side, the fourth lens group G4 is composed of only one lens of lenses L to L in order from the magnified side, the fifth lens group G3 is composed of only two lenses of a lens L to L in order from the magnified side, the fifth lens group G4643 is composed of only one lens of a lens L to a lens L in order from the magnified side, the fifth lens group G2 is composed of only one lens of a lens 469 to a lens 8655, and the fifth lens group G5955 is composed of only one lens of a lens 469 to a lens 8655 in order from the magnified side, the fifth lens group G599 is composed of a lens L and a focusing lens 8655 is joined to the fifth lens group G5917 in order from the magnified side, and the fifth lens group G5955 is joined to the convex-a focusing lens 8416 by a lens 82862 and the optical axis of a lens L.
Basic lens data of the zoom lens for projection of embodiment 4 are shown in table 7, technical parameters and variable surface intervals are shown in table 8, and respective aberration diagrams are shown in fig. 14.
[ Table 7]
Example 4
| Si | Ri | Di | Ndj | νdj | Name of glass Material (manufacturer) |
| 1 | 31.6928 | 5.168 | 1.77250 | 49.60 | S-LAH66(OHARA) |
| 2 | 81.7439 | 0.096 | |||
| 3 | 29.2798 | 1.007 | 1.65160 | 58.55 | S-LAL7(OHARA) |
| 4 | 16.7797 | 2.828 | |||
| 5 | 25.5071 | 0.959 | 1.77250 | 49.60 | S-LAH66(OHARA) |
| 6 | 15.3732 | 5.638 | |||
| 7 | -95.7607 | 0.887 | 1.84666 | 23.78 | S-TIH53W(OHARA) |
| 8 | 28.1070 | 2.158 | |||
| 9 | ∞ | 0.767 | 1.80000 | 29.84 | S-NBH55(OHARA) |
| 10 | 40.5852 | 4.942 | |||
| 11 | -27.2580 | 0.772 | 1.61800 | 63.33 | S-PHM52(OHARA) |
| 12 | 39.6493 | 6.233 | 1.77250 | 49.62 | TAF1(HOYA) |
| 13 | -25.7694 | DD[13] | |||
| 14 | 148.1908 | 2.493 | 1.80610 | 33.27 | NBFD15-W(HOYA) |
| 15 | -81.2421 | DD[15] | |||
| 16 | 30.6724 | 4.799 | 1.62004 | 36.26 | S-IIM2(OHARA) |
| 17 | -37.9126 | 0.719 | 1.77250 | 49.60 | S-LAH66(OHARA) |
| 18 | 50.2466 | DD[18] | |||
| 19 | 27.8974 | 6.478 | 1.49700 | 81.61 | FCDI(HOYA) |
| 20 | -17.2922 | 0.742 | 1.65844 | 50.88 | S-BSM25(OHARA) |
| 21 | -60.9712 | 2.402 | 1.59522 | 67.73 | S-FPM2(OHARA) |
| 22 | -27.9574 | DD[22] | |||
| 23(St) | ∞ | 6.162 | |||
| 24 | 16.5667 | 0.719 | 1.75520 | 27.51 | S-TIH4(OHARA) |
| 25 | 12.5956 | 3.484 | |||
| 26 | -11.4997 | 0.628 | 1.61340 | 44.27 | S-NBM51(OHARA) |
| 27 | 30.4644 | 3.913 | 1.49700 | 81.61 | FCD1(HOYA) |
| 28 | -14.8463 | 0.431 | |||
| 29 | 54.4158 | 5.518 | 1.49700 | 81.61 | FCD1(HOYA) |
| 30 | -11.9853 | 0.868 | 1.51742 | 52.43 | S-NSL36(OHARA) |
| 31 | -32.9835 | DD[31] | |||
| 32 | 35.6455 | 3.761 | 1.49700 | 81.61 | FCD1(HOYA) |
| 33 | -39.1638 | 7.684 | |||
| 34 | ∞ | 13.600 | 1.51633 | 64.14 | S-BSL7(OHARA) |
| 35 | ∞ | 0.000 |
[ Table 8]
Example 4
| WIDE | middle | TELE | |
| Zr | 1.00 | 1.30 | 1.52 |
| f | 10.00 | 13.00 | 15.20 |
| FNo. | 2.48 | 2.48 | 2.48 |
| 2ω(°) | 63.6 | 51.0 | 44.6 |
| DD[13] | 15.509 | 6.057 | 1.904 |
| DD[15] | 0.995 | 15.129 | 19.126 |
| DD[18] | 18.410 | 5.692 | 0.336 |
| DD[22] | 0.240 | 3.742 | 6.435 |
| DD[31] | 4.183 | 8.717 | 11.536 |
[ example 5]
In the zoom lens for projection of example 5, the first lens group G1 is composed of seven lenses of lenses L to L in order from the magnified side, the second lens group G2 is composed of only one lens of lens 021, the third lens group G3 is composed of two lenses of lenses L to L in order from the magnified side, the fourth lens group G4 is composed of two lenses of lenses 57327 to L in order from the magnified side, the third lens group G3 is composed of two lenses of lenses L to L in order from the magnified side, the fourth lens group G4 is composed of only one lens of lenses L021, the fifth lens group G68643 is composed of three lenses L to L in order from the magnified side, and the fifth lens group G8656 is composed of two lenses of lenses 828653 to 8617 in order from the magnified side, and the fifth lens group G8656 is composed of two lenses of lenses 8428 to 8653 in order from the magnified side, and the fifth lens group G8653 is composed of lenses 828658 and the fifth lens group G8653 is composed of lenses 8658 and the fifth lens is composed of lenses 828653 in order from the magnified side, and the magnification side, and the fifth lens group is joined together by the lens 8658 and the convex-828616.
Basic lens data of the zoom lens for projection of embodiment 5 are shown in table 9, technical parameters and variable surface intervals are shown in table 10, and respective aberration diagrams are shown in fig. 15.
[ Table 9]
Example 5
| Si | Ri | Di | Ndj | νdj | Name of glass Material (manufacturer) |
| 1 | 35.4020 | 4.674 | 1.77250 | 49.60 | S-LAH66(OHARA) |
| 2 | 108.3326 | 0.096 | |||
| 3 | 32.7373 | 1.008 | 1.65160 | 58.55 | S-LAL7(OHARA) |
| 4 | 16.8043 | 3.631 | |||
| 5 | 33.8350 | 0.960 | 1.77250 | 49.60 | S-LAH66(OHARA) |
| 6 | 16.1513 | 6.355 | |||
| 7 | -33.5192 | 1.200 | 1.84666 | 23.78 | S-T1H53W(OHARA) |
| 8 | 56.7661 | 1.202 | |||
| 9 | ∞ | 1.086 | 1.80000 | 29.84 | S-NBH55(OHARA) |
| 10 | 58.0313 | 4.054 | |||
| 11 | -33.9050 | 0.894 | 1.49700 | 81.54 | S-FPL51(OHARA) |
| 12 | 59.7110 | 6.241 | 1.77250 | 49.62 | TAF1(HOYA) |
| 13 | 24.9316 | DD[13] | |||
| 14 | 78.6513 | 2.497 | 1.80610 | 33.27 | NBFD15-W(HOYA) |
| 15 | -4983.3599 | DD[15] | |||
| 16 | 37.9853 | 3.645 | 1.67270 | 32.10 | S-TIM25(OHARA) |
| 17 | -41.3977 | 0.721 | 1.77250 | 49.60 | S-LAH66(OHARA) |
| 18 | 46.3884 | DD[18] | |||
| 19 | 32.6867 | 6.006 | 1.49700 | 81.54 | S-FPL51(OHARA) |
| 20 | -19.5190 | 0.864 | 1.65412 | 39.68 | S-NBH5(OHARA) |
| 21 | -82.8305 | 2.262 | 1.56883 | 56.04 | BAC4(HOYA) |
| 22 | -30.9899 | DD[22] | |||
| 23(St) | ∞ | 6.918 | |||
| 24 | 18.5290 | 0.624 | 1.80518 | 25.46 | FD60-W(HOYA) |
| 25 | 14.0123 | 3.600 | |||
| 26 | -12.2576 | 0629 | 1.61340 | 44.27 | S-NBM51(OHARA) |
| 27 | 41.9901 | 3.121 | 1.49700 | 81.61 | FCD1(HOYA) |
| 28 | -16.4175 | 0.391 | |||
| 29 | 54.4957 | 6.338 | 1.49700 | 81.61 | FCD1(HOYA) |
| 30 | -12.7610 | 0.869 | 1.51742 | 52.43 | S-NSL36(OHARA) |
| 31 | -32.2529 | DD[31] | |||
| 32 | 345.5426 | 2.016 | 1.53775 | 74.70 | S-FPM3(OHARA) |
| 33 | 62.9685 | 4.731 | |||
| 34 | 68.8501 | 2.197 | 1.49700 | 81.61 | FCD1(HOYA) |
| 35 | -50.0704 | 7.475 | |||
| 36 | ∞ | 13.600 | 1.51633 | 64.14 | S-BSL7(OHARA) |
| 37 | ∞ | 0.000 |
[ Table 10]
Example 5
| WIDE | middle | TELE | |
| Zr | 1.00 | 1.30 | 1.52 |
| f | 10.00 | 13.00 | 15.20 |
| FNo. | 2.48 | 2.48 | 2.48 |
| 2ω(°) | 63.8 | 51.2 | 44.6 |
| DD[13] | 25.002 | 9.497 | 2.145 |
| DD[15] | 0.996 | 18.883 | 24.091 |
| DD[18] | 15.895 | 4.996 | 1.010 |
| DD[22] | 0.427 | 4.523 | 7.532 |
| DD[31] | 1.755 | 6.177 | 9.297 |
[ example 6]
In the zoom lens for projection of example 6, the first lens group G1 is composed of seven lenses of lenses L to L in order from the magnified side, the second lens group G2 is composed of only one lens of the lens L021, the third lens group G3 is composed of two lenses of the lenses L to L in order from the magnified side, the fourth lens group G4 is composed of only one lens of the lenses L021, the third lens group G3 is composed of two lenses of the lenses L to 8624 in order from the magnified side, the fifth lens group G4 is composed of three lenses L to L in order from the magnified side, and the fifth lens group G8656 is composed of two lenses of three lenses of the lenses 57324 to L in order from the magnified side, the fifth lens group G8656 is composed of three lenses of the lenses 8656 to the lenses 8653 in order from the magnified side, and the fifth lens group G8653 is composed of the convex lens 8653 and the convex lens 8653 is composed of the lens 8658 and the convex lens 865 is joined with the concave-convex lens L in order from the magnified side, and the magnification side by the convex-8258.
Basic lens data of the zoom lens for projection of embodiment 6 are shown in table 11, technical parameters and variable surface intervals are shown in table 12, and respective aberration diagrams are shown in fig. 16.
[ Table 11]
Example 6
| Si | Ri | Di | Ndj | νdj | Name of glass Material (manufacturer) |
| 1 | 37.1928 | 4.561 | 1.77250 | 49.60 | S-LAH66(OHARA) |
| 2 | 110.1977 | 0.096 | |||
| 3 | 32.1365 | 1.152 | 1.65160 | 58.55 | S-LAL7(OHARA) |
| 4 | 16.8037 | 3.513 | |||
| 5 | 32.9808 | 0.960 | 1.77250 | 49.62 | TAF1(HOYA) |
| 6 | 16.3813 | 6.234 | |||
| 7 | -35.2438 | 0.960 | 1.84666 | 23.78 | S-TIH53W(OHARA) |
| 8 | 53.9970 | 1.262 | |||
| 9 | ∞ | 0.960 | 1.80000 | 29.84 | S-N8H55(OHARA) |
| 10 | 58.5981 | 4.750 | |||
| 11 | -36.6577 | 1.013 | 1.49700 | 81.54 | S-FPL51(OHARA) |
| 12 | 62.5105 | 6.241 | 1.77250 | 49.62 | TAF1(HOYA) |
| 13 | -25.7659 | DD[13] | |||
| 14 | 76.8356 | 2.160 | 1.80610 | 33.27 | NBFD15-W(HOYA) |
| 15 | ∞ | DD[15] | |||
| 16 | 34.5240 | 3.990 | 1.67270 | 32.10 | S-TIM25(OHARA) |
| 17 | 46.3730 | 0.816 | 1.77250 | 49.60 | S-LAH66(OHARA) |
| 18 | 38.9215 | DD[18] | |||
| 19 | 29.0819 | 6.041 | 1.49700 | 81.54 | S-FPL51(OHARA) |
| 20 | -18.8932 | 0.816 | 1.65412 | 39.68 | S-NBH5(OHARA) |
| 21 | -67.9351 | 1.688 | 1.56883 | 56.04 | BAC4(HOYA) |
| 22 | -30.6445 | DD[22] | |||
| 23(St) | ∞ | 6.174 | |||
| 24 | 17.8965 | 0.624 | 1.80518 | 25.46 | FD60-W(HOYA) |
| 25 | 13.5369 | 3.479 | |||
| 26 | -12.1583 | 0.629 | 1.61340 | 44.27 | S-NBM51(OHARA) |
| 27 | 30.2341 | 3.985 | 1.49700 | 81.61 | FCD1(HOYA) |
| 28 | -16.1545 | 0.241 | |||
| 29 | 54.4938 | 5.521 | 1.49700 | 81.61 | FCD1(HOYA) |
| 30 | -13.3387 | 0.773 | 1.51742 | 52.43 | S-NSL36(OHARA) |
| 31 | -36.8267 | DD[31] | |||
| 32 | 370.3222 | 1.824 | 1.49700 | 81.54 | S-FPL51(OHARA) |
| 33 | -57.3886 | 3.545 | |||
| 34 | 88.4263 | 2.497 | 1.53775 | 74.70 | S-FPM3(OHARA) |
| 35 | -45.2494 | 7.474 | |||
| 36 | ∞ | 13.600 | 1.51633 | 64.14 | S-BSL7(OHARA) |
| 37 | ∞ | 0.000 |
[ Table 12]
Example 6
| WIDE | middle | TELE | |
| Zr | 1.00 | 1.30 | 1.52 |
| f | 10.00 | 13.00 | 15.20 |
| FNo. | 2.48 | 2.48 | 2.48 |
| 2ω(°) | 63.8 | 51.2 | 44.6 |
| DD[13] | 25.759 | 10.023 | 2.158 |
| DD[15] | 0.996 | 19.146 | 25.757 |
| DD[18] | 15.455 | 5.137 | 0.696 |
| DD[22] | 0.384 | 3.563 | 6.137 |
| DD[31] | 3.268 | 7.992 | 11.114 |
[ example 7]
Fig. 7 shows a lens structure and a light beam of the zoom lens for projection of example 7, the zoom lens for projection of example 7 has a 6-group structure in which a first lens group G1 having negative power, a second lens group G2 having positive power, a third lens group G3 having negative power, a fourth lens group G4 having positive power, an aperture stop St, a fifth lens group G5 having negative power, and a sixth lens group G6. having positive power are arranged in this order from the magnification side in the zoom lens for projection of example 7, the first lens group G1 is composed of seven lenses of lenses L to L in order from the magnification side, the second lens group G2 is composed of only one lens of the lenses L021, the third lens group G3 is composed of two lenses of the lenses L to L in order from the magnification side, the fourth lens group G4 is composed of only one lens 68641 to L in order from the magnification side, the fifth lens group G5923 is composed of two lenses of the lenses L to L in order from the magnification side, the fifth lens group G5953 is composed of the lenses 8658 and the fifth lens group 8653 is joined to the convex lens 8653 in order from the magnification side through the magnification side in the fifth lens 828658, and the fifth lens group 8658 is joined to the fifth lens group 8616 in order from the magnification side in the magnification side by the magnification side in the magnification side of the magnification side in the magnification side.
Basic lens data of the zoom lens for projection of embodiment 7 are shown in table 13, technical parameters and variable surface intervals are shown in table 14, and respective aberration diagrams are shown in fig. 17.
[ Table 13]
Example 7
| Si | Ri | Di | Ndj | νdj | Name of glass Material (manufacturer) |
| 1 | 36.3982 | 4.801 | 1.77250 | 49.60 | S-LAH66(OHARA) |
| 2 | 118.2422 | 0.096 | |||
| 3 | 34.2537 | 1.152 | 1.61800 | 63.33 | S-PHM52(OHARA) |
| 4 | 16.8040 | 3.594 | |||
| 5 | 34.3793 | 0.960 | 1.77250 | 49.62 | IAF1(HOYA) |
| 6 | 16.5181 | 6.082 | |||
| 7 | -35.0475 | 0.960 | 1.84661 | 23.88 | S-IIH53W(OHARA) |
| 8 | 46.5632 | 1.410 | |||
| 9 | ∞ | 0.960 | 1.80000 | 29.84 | S-NBH55(OHARA) |
| 10 | 58.8336 | 4.270 | |||
| 11 | -38.0928 | 1.013 | 1.49700 | 81.54 | S-FPL51(OHARA) |
| 12 | 55.1383 | 6.167 | 1.77250 | 49.60 | S-LAH66(OHARA) |
| 13 | -25.8398 | DD[13] | |||
| 14 | 78.4726 | 2.160 | 1.80610 | 33.27 | NBFD15-W(HOYA) |
| 15 | ∞ | DD[15] | |||
| 16 | 37.6755 | 3.990 | 1.67270 | 32.10 | S-TIM25(OHARA) |
| 17 | -43.9988 | 0.816 | 1.77250 | 49.60 | S-LAH66(OHARA) |
| 18 | 43.5471 | DD[18] | |||
| 19 | 28.4911 | 5.862 | 1.49700 | 81.54 | S-FPL51(OHARA) |
| 20 | -18.5921 | 0.816 | 1.65412 | 39.68 | S-NBH5(OHARA) |
| 21 | -62.2787 | 2.405 | 1.56883 | 56.04 | BAC4(HOYA) |
| 22 | -30.8493 | DD[22] | |||
| 23(St) | ∞ | 6.909 | |||
| 24 | 18.0036 | 0.624 | 1.80518 | 25.46 | FD60-W(HOYA) |
| 25 | 138173 | 3.709 | |||
| 26 | -11.9629 | 0.629 | 1.61340 | 44.27 | S-NBM51(OHARA) |
| 27 | 29.9933 | 3.984 | 1.49700 | 81.61 | FCD1(HOYA) |
| 28 | -16.2611 | 0.240 | |||
| 29 | 54.4946 | 5.521 | 1.49700 | 81.61 | FCD1(HOYA) |
| 30 | -13.7100 | 0.773 | 1.57099 | 50.80 | S-8AL2(OHARA) |
| 31 | -30.7224 | DD[31] | |||
| 32 | 503.6009 | 1.824 | 1.53775 | 74.70 | S-FPM3(OHARA) |
| 33 | -61.7610 | 3.815 | |||
| 34 | 85.4173 | 2.737 | 1.49700 | 81.61 | FCD1(HOYA) |
| 35 | -40.8118 | 7.568 | |||
| 36 | ∞ | 13.600 | 1.51633 | 64.14 | S-BSL7(OHARA) |
| 37 | ∞ | 0.000 |
[ Table 14]
Example 7
| WIDE | middle | TELE | |
| Zr | 1.00 | 1.30 | 1.52 |
| f | 10.00 | 13.00 | 15.20 |
| FNo. | 2.48 | 2.48 | 2.48 |
| 2ω(°) | 63.6 | 51.2 | 44.6 |
| DD[13] | 23.774 | 8.731 | 1.381 |
| DD[15] | 0.336 | 18.728 | 23.814 |
| DD[18] | 15.683 | 4.339 | 0.750 |
| DD[22] | 0.384 | 3.976 | 6.626 |
| DD[31] | 1.144 | 5.548 | 8.749 |
[ example 8]
In the zoom lens for projection of example 8, the first lens group G1 is composed of seven lenses of lenses L to L in order from the magnified side, the second lens group G2 is composed of only one lens of the lens L021, the third lens group G3 is composed of two lenses of the lenses L to L in order from the magnified side, the fourth lens group G4 is composed of only two lenses of the lenses L to L in order from the magnified side, the fifth lens group G8656 is composed of two lenses of the lenses 57324 to L in order from the magnified side, the fifth lens group G8656 is composed of two lenses of the lenses 57327 to 4617 in order from the magnified side, and the fifth lens group G2 is composed of two lenses of the lenses 82865 to 8653 in order from the magnified side and the fifth lens group G8653 is composed of two lenses of the lenses 57327 to 469 to 8617 in order from the magnified side, and the fifth lens group G8656 is composed of the lenses 82865 and the fifth lens 8653 is composed of the lens 865 and the fifth lens group G8653 is composed of the lens 865 and the lens 8653 in order from the magnified side, and the fifth lens group is composed of the convex-concave-convex-concave-convex-concave lens 86-convex lens 8653 in order from the concave-convex-concave-convex-concave-.
Basic lens data of the zoom lens for projection of example 8 is shown in table 15, technical parameters and variable surface intervals are shown in table 16, and respective aberration diagrams are shown in fig. 18.
[ Table 15]
Example 8
| Si | Ri | Di | Ndj | νdj | Name of glass Material (manufacturer) |
| 1 | 36.4080 | 4.800 | 1.77250 | 49.62 | TAF1(HOYA) |
| 2 | 117.9423 | 0.096 | |||
| 3 | 34.8740 | 1.152 | 1.61800 | 63.33 | S-PHM52(OHARA) |
| 4 | 16.8029 | 3.446 | |||
| 5 | 32.3910 | 0.960 | 1.77250 | 49.62 | TAF1(HOYA) |
| 6 | 16.4482 | 6.116 | |||
| 7 | -36.0545 | 0.960 | 1.84661 | 23.88 | S-TIH53W(OHARA) |
| 8 | 50.4532 | 1.315 | |||
| 9 | ∞ | 0.960 | 1.80000 | 29.84 | S-NBH55(OHARA) |
| 10 | 51.3666 | 4.384 | |||
| 11 | -36.9452 | 1.013 | 1.49700 | 81.61 | FCD1(HOYA) |
| 12 | 54.7879 | 6.175 | 1.77250 | 49.62 | TAF1(HOYA) |
| 13 | -25.9782 | DD[13] | |||
| 14 | 82.8169 | 2.160 | 1.80610 | 33.27 | NBFD15-W(HOYA) |
| 15 | ∞ | DD[15] | |||
| 16 | 37.0943 | 4.133 | 1.67270 | 32.10 | S-TIM25(OHARA) |
| 17 | -45.5975 | 0.816 | 1.77250 | 49.62 | TAF1(HOYA) |
| 18 | 43.2548 | DD[18] | |||
| 19 | 28.5597 | 5.856 | 1.49700 | 81.61 | FCD1(HOYA) |
| 20 | -19.1512 | 0.821 | 1.65412 | 39.68 | S-NBH5(OHARA) |
| 21 | -62.6988 | 2.405 | 1.56883 | 56.04 | BAC4(HOYA) |
| 22 | -31.7864 | DD[22] | |||
| 23(St) | ∞ | 7.119 | |||
| 24 | 17.9468 | 0.624 | 1.80518 | 25.46 | FD60-W(HOYA) |
| 25 | 13.8987 | 3.794 | |||
| 26 | -11.9850 | 0.629 | 1.61340 | 44.27 | S-NBM51(OHARA) |
| 27 | 31.4060 | 3.984 | 1.49700 | 81.61 | FCD1(HOYA) |
| 28 | -16.3886 | 0.239 | |||
| 29 | 54.4911 | 5.519 | 1.49700 | 81.61 | FCD1(HOYA) |
| 30 | -14.0010 | 0.773 | 1.57099 | 50.80 | SBAL2(OHARA) |
| 31 | -30.1903 | DD[31] | |||
| 32 | 377.6230 | 1.824 | 1.49700 | 81.61 | FCD1(HOYA) |
| 33 | -59.4076 | 4.457 | |||
| 34 | 82.9236 | 2.736 | 1.49700 | 81.61 | FCD1(HOYA) |
| 35 | -42.8557 | 7.567 | |||
| 36 | ∞ | 13.600 | 1.51633 | 64.14 | S-BSL7(OHARA) |
| 37 | ∞ | 0.000 |
[ Table 16]
Example 8
| WIDE | middle | TELE | |
| Zr | 1.00 | 1.30 | 1.52 |
| f | 10.00 | 13.00 | 15.20 |
| FNo. | 2.48 | 2.48 | 2.48 |
| 2ω(°) | 63.8 | 51.2 | 44.6 |
| DD[13] | 23.703 | 8.374 | 1.110 |
| DD[15] | 0.336 | 18.437 | 23.278 |
| DD[18] | 15.763 | 4.625 | 1.055 |
| DD[22] | 0.384 | 4.051 | 6.761 |
| DD[31] | 0.532 | 5.232 | 8.514 |
[ example 9]
In the zoom lens for projection of example 9, the first lens group G1 is composed of seven lenses of lenses L to L in order from the magnified side, the second lens group G2 is composed of only one lens of the lens L021, the third lens group G3 is composed of two lenses of the lenses L to L in order from the magnified side, the fourth lens group G4 is composed of two lenses of the lenses L to 8624 in order from the magnified side, the fourth lens group G4 is composed of three lenses of the lenses 6341 to 68643 in order from the magnified side, and the fifth lens group G8656 is composed of two lenses of the lenses 57324 to L in order from the magnified side, and the fifth lens group G8656 is composed of three lenses of the lenses 6L to L and a light beam is composed of five lenses 8656 and a convex lens 8653 in order from the magnified side, and the fifth lens group G8653 is composed of two lenses of a lens of the lenses 828653 to 8617 in order from the magnified side, and the fifth lens group G8653 is composed of a lens 865 and a convex lens group G8653 is composed of a convex lens 865 and a concave lens 865 is joined with the convex lens group 865 in order from the magnified side, and the convex lens group 865.
Basic lens data of the zoom lens for projection of embodiment 9 is shown in table 17, technical parameters and variable surface intervals are shown in table 18, and respective aberration diagrams are shown in fig. 19.
[ Table 17]
Example 9
| Si | Ri | Di | Ndj | νdj | Name of glass Material (manufacturer) |
| 1 | 37.8636 | 4.681 | 1.77250 | 49.62 | TAF1(HOYA) |
| 2 | 119.8296 | 0.168 | |||
| 3 | 31.6764 | 0.960 | 1.61800 | 63.33 | S-PHM52(OHARA) |
| 4 | 16.8053 | 3.420 | |||
| 5 | 32.6736 | 0.768 | 1.77250 | 49.62 | TAF1(HOYA) |
| 6 | 16.3374 | 6.070 | |||
| 7 | -38.5656 | 0.720 | 1.84661 | 23.88 | S-TIH53W(OHARA) |
| 8 | 44.9845 | 1.391 | |||
| 9 | ∞ | 0.672 | 1.80000 | 29.84 | S-NBH55(OHARA) |
| 10 | 52.0652 | 4.400 | |||
| 11 | -34.4848 | 0.869 | 1.49700 | 81.61 | FCD1(HOYA) |
| 12 | 53.4049 | 5.954 | 1.77250 | 49.62 | TAF1(HOYA) |
| 13 | -25.8245 | DD[13] | |||
| 14 | 77.9183 | 1.680 | 1.80610 | 33.27 | NBFD15-W(HOYA) |
| 15 | ∞ | DD[15] | |||
| 16 | 37.9791 | 4.158 | 1.67270 | 32.10 | S-TIM25(OHARA) |
| 17 | -46.5642 | 0.672 | 1.77250 | 49.62 | IAF1(HOYA) |
| 18 | 45.1497 | DD[18] | |||
| 19 | 29.9622 | 5.714 | 1.49700 | 81.61 | FCD1(HOYA) |
| 20 | -19.9196 | 0.725 | 1.65412 | 39.68 | S-NBH5(OHARA) |
| 21 | -118.1364 | 2.406 | 1.56883 | 56.04 | BAC4(HOYA) |
| 22 | -32.7687 | DD[22] | |||
| 23(St) | ∞ | 7.508 | |||
| 24 | 18.7007 | 0.576 | 1.80518 | 25.46 | FD60-W(HOYA) |
| 25 | 14.5050 | 3.645 | |||
| 26 | -12.4256 | 0.581 | 1.61340 | 44.27 | SNBM51(OHARA) |
| 27 | 30.1727 | 4.153 | 1.49700 | 81.61 | FCD1(HOYA) |
| 28 | -16.3217 | 0.241 | |||
| 29 | 42.1620 | 5.330 | 1.49700 | 81.61 | FCD1(HOYA) |
| 30 | -14.9329 | 0.677 | 1.57099 | 50.80 | S-BAL2(OHARA) |
| 31 | -37.3858 | DD[31] | |||
| 32 | 292.8878 | 1.921 | 1.49700 | 81.61 | FCD1(HOYA) |
| 33 | -50.8301 | 2.297 | |||
| 34 | 71.1776 | 2.449 | 1.49700 | 81.61 | FCD1(HOYA) |
| 35 | -59.5868 | 7.642 | |||
| 36 | ∞ | 13.600 | 1.51633 | 64.14 | S-BSL7(OHARA) |
| 37 | ∞ | 0.000 |
[ Table 18]
Example 9
| WIDE | middle | TELE | |
| Zr | 1.00 | 1.30 | 1.52 |
| f | 10.00 | 13.00 | 15.20 |
| FNo. | 2.48 | 2.48 | 2.48 |
| 2ω(°) | 63.8 | 51.2 | 44.6 |
| DD[13] | 25.381 | 10.870 | 4.276 |
| DD[15] | 0.336 | 16.851 | 22.005 |
| DD[18] | 15.520 | 4.934 | 0.340 |
| DD[22] | 0.864 | 4.804 | 7.684 |
| DD[31] | 3.033 | 7.674 | 10.828 |
[ example 10]
In the zoom lens for projection of example 10, the first lens group G1 is composed of seven lenses of lenses 3611 to L in order from the magnified side, the second lens group G2 is composed of only one lens of the lenses L021, the third lens group G3 is composed of two lenses of the lenses L to L in order from the magnified side, the fourth lens group G4 is composed of only one lens of the lenses L to L in order from the magnified side, the fifth lens group G3 is composed of only two lenses of the lenses L to L in order from the magnified side, the fifth lens group G4643 is composed of only one lens of the lenses L to L, the fifth lens group G2 is composed of only one lens of the lenses L to L in order from the magnified side, the fifth lens group G5954 is composed of only one lens of the lenses 4654 to 5917, and the sixth lens group G6354 is composed of only one lens of the lenses 469 to 5917, and the fourth lens group G4 is composed of the lenses L and the fourth lens is composed of the lenses 5923 and the fourth lens is composed of the lenses L and the third lens group G8656 is joined to the convex lens 8416 in order from the magnified side, and the optical axis of the convex-82862.
Basic lens data of the zoom lens for projection of example 10 is shown in table 19, technical parameters and variable surface intervals are shown in table 20, and respective aberration diagrams are shown in fig. 20.
[ Table 19]
Example 10
| Si | Ri | Di | Ndj | νdj | Name of glass Material (manufacturer) |
| 1 | 33.0386 | 5.093 | 1.77250 | 49.60 | S-LAH66(OHARA) |
| 2 | 85.1024 | 0.095 | |||
| 3 | 26.1732 | 1.007 | 1.78590 | 44.20 | S-LAH51(OHARA) |
| 4 | 14.9090 | 6.403 | |||
| 5 | 371.5893 | 0.959 | 1.84666 | 23.78 | S-TIH53W(OHARA) |
| 6 | 24.3274 | 2.624 | |||
| 7 | 381.3009 | 0.887 | 1.77250 | 49.60 | S-LAH66(OHARA) |
| 8 | 30.6036 | 1.908 | |||
| 9 | 698.6572 | 0.767 | 1.83400 | 37.16 | S-LAH60(OHARA) |
| 10 | 48.0010 | 5.225 | |||
| 11 | -27.5542 | 0.772 | 1.49700 | 81.54 | S-FPL51(OHARA) |
| 12 | 45.3290 | 6.099 | 1.77250 | 49.60 | S-LAH66(OHARA) |
| 13 | -27.0037 | DD[13] | |||
| 14 | 77.6144 | 2.395 | 1.80610 | 33.27 | NBFD15(HOYA) |
| 15 | -205.6539 | DD[15] | |||
| 16 | 44.0385 | 3.660 | 1.60342 | 38.03 | S-TIM5(OHARA) |
| 17 | -42.3628 | 0.719 | 1.77250 | 49.60 | S-LAH66(OHARA) |
| 18 | 55.2998 | DD[18] | |||
| 19 | 25.2366 | 5.514 | 1.49700 | 81.54 | S-FPL51(OHARA) |
| 20 | -18.9649 | 0.730 | 1.57099 | 50.80 | S-BAL2(OHARA) |
| 21 | 25.6616 | 3.090 | 1.59522 | 67.73 | S-FPM2(OHARA) |
| 22 | -42.1684 | DD[22] | |||
| 23(St) | ∞ | DD[23] | |||
| 24 | 16.3923 | 0.527 | 1.80518 | 25.42 | S-TIH6(OHARA) |
| 25 | 12.6874 | 3.030 | |||
| 26 | -12.0393 | 0.964 | 1.61340 | 44.27 | S-NBM51(OHARA) |
| 27 | 19.6534 | 4.033 | 1.49700 | 81.54 | S-FPL51(OHARA) |
| 28 | -17.2619 | 0.431 | |||
| 29 | 49.8678 | 5.067 | 1.49700 | 81.54 | S-FPL51(OHARA) |
| 30 | -34.5206 | DD[30] | |||
| 31 | 29.3022 | 3.837 | 1.49700 | 81.54 | S-FPL51(OHARA) |
| 32 | -44.2864 | 7.522 | |||
| 33 | ∞ | 13.600 | 1.51633 | 64.14 | S-BSL7(OHARA) |
| 34 | ∞ | 0.000 |
[ Table 20]
Example 10
| WIDE | middle | TELE | |
| Zr | 1.00 | 1.30 | 1.52 |
| f | 10.00 | 13.00 | 15.20 |
| FNo. | 2.48 | 2.48 | 2.48 |
| 2ω(°) | 63.6 | 51.2 | 44.6 |
| DD[13] | 18.695 | 8.312 | 3.059 |
| DD[15] | 0.144 | 16.572 | 21.380 |
| DD[18] | 18.602 | 5.205 | 0.144 |
| DD[22] | 0.144 | 3.857 | 8.315 |
| DD[23] | 7.498 | 6.139 | 3.577 |
| DD[30] | 2.563 | 7.561 | 11.171 |
Table 21 shows the corresponding values of conditional expressions (1) to (8) and the values of the conditional expressions in the zoom lenses for projection according to embodiments 1 to 10, where the values shown in table 21 are values based on the d-line, in table 21, the corresponding value of dd56/Im Φ shows the maximum value and the minimum value in the entire variable power region, and the values of dd56 and Φ y/Φ c are shown in the columns in which the respective values in the WIDE-angle end state, the intermediate focal length state, and the telephoto end state are denoted as WIDE and mid L E, TE L E, respectively.
[ Table 21]
As is clear from the above data, the zoom lenses for projection of embodiments 1 to 10 are zoom lenses for projection which are telecentric on the reduction side, are compact, are configured so that the F value is substantially constant at the time of magnification change, have a small value such as 2.48 to 2.50 in the entire magnification change region, have a high zoom ratio as a projection lens with a zoom ratio of 1.52, can secure a high peripheral light amount, can correct various aberrations well, and have high performance.
Next, a projection display device according to an embodiment of the present invention will be described. Fig. 21 is a schematic configuration diagram of a projection display device according to an embodiment of the present invention. The projection display apparatus 100 shown in fig. 21 includes: a zoom lens 10 for projection according to an embodiment of the present invention; a light source 15; transmissive display elements 11a to 11c as light valves corresponding to the respective color lights; dichroic mirrors 12, 13 for color separation; a cross dichroic prism 14 for color synthesis; condenser lenses 16a to 16 c; and total reflection mirrors 18a to 18c for polarizing the optical path. Fig. 21 schematically illustrates a zoom lens 10 for projection. Although an integrator is disposed between the light source 15 and the dichroic mirror 12, this is not shown in fig. 21.
White light from the light source 15 is decomposed into three color light beams (G light, B light, and R light) by dichroic mirrors 12 and 13, and then incident on the transmissive display elements 11a to 11c corresponding to the respective color light beams via condenser lenses 16a to 16c, modulated by light, color-combined by a cross dichroic prism 14, and then incident on the projection zoom lens 10. The projection zoom lens 10 projects an optical image formed by light modulated by the transmissive display elements 11a to 11c onto the screen 105.
The present invention has been described above by way of the embodiments and examples, but the present invention is not limited to the above embodiments and examples, and various modifications are possible. For example, the curvature radius, the surface interval, the refractive index, and the abbe number of each lens are not limited to the above numerical values, i.e., the values shown in the examples, and may be other values.
The projection display device of the present invention is not limited to the above configuration, and for example, the light valve and the optical member for beam splitting or beam combining to be used are not limited to the above configuration, and various modifications can be made.
Description of the symbols
Zoom lens for 10 projection
11a to 11c transmission type display element
12. 13 dichroic mirror
14 cross dichroic prism
15 light source
16a to 16c condenser lens
18 a-18 c total reflection mirror
100 projection display device
105 screen
CE meniscus lens
G1 first lens group
G2 second lens group
G3 third lens group
G4 fourth lens group
G5 fifth lens group
G6 sixth lens group
L11-L17, L021-L123, L31, L32, L41-L43, L51-L56, L61, L62 lens
PP optical member
Sim image display surface
St aperture diaphragm
Light beam on ma, ta and wa axes
Beams of middle view angles mb, tb, wb
Light beam with maximum view angles of mc, tc and wc
Z optical axis
Claims (15)
1. A zoom lens for projection, characterized in that,
composed of a first lens group having negative power, a second lens group having positive power, a third lens group having negative power, a fourth lens group having positive power, a diaphragm, a fifth lens group, and a sixth lens group having positive power in this order from the magnification side,
the first lens group and the sixth lens group are fixed with respect to a reduction-side image forming surface at the time of magnification change, the second lens group, the third lens group, the fourth lens group, and the fifth lens group are moved by changing an interval in an optical axis direction with an adjacent lens group,
the reduction side is configured to be telecentric,
at least one cemented lens is included from a lens surface closest to the enlargement side to a lens surface closest to the reduction side of the second lens group, and the cemented lens closest to the reduction side of the at least one cemented lens included from the lens surface closest to the enlargement side to the lens surface closest to the reduction side of the second lens group is a meniscus cemented lens having positive refractive power as a whole, in which a biconcave lens and a biconvex lens are cemented in this order from the enlargement side,
when the combined focal length of all the lenses closer to the magnification side than the meniscus lens at the wide-angle end is represented by ffc and the focal length of the entire system at the wide-angle end is represented by fw, the following conditional expression (1) is satisfied,
1＜|ffc/fw|＜2 (1)
the zoom-in side is set to be negative and the zoom-out side is set to be positive with a base point of a lens surface of the fourth lens group closest to the zoom-out side as a base point, a distance on the optical axis between a focal position on the zoom-in side of a lens group obtained by combining the fifth lens group and the sixth lens group and the base point at this time is set to dd56, and an effective image circle diameter on the zoom-out side of the entire system is set to Im Φ, and the following conditional expression (2) is satisfied in at least a part of a variable magnification region from the wide-angle end to the telephoto end,
-0.7＜dd56/ImΦ＜3 (2)
when the maximum value of the focal length of the entire system in the variable magnification region satisfying the conditional expression (2) is fdmax, and the minimum value of the focal length of the entire system in the variable magnification region satisfying the conditional expression (2) is fdmin, the following conditional expression (3) is satisfied,
1.35＜fdmax/fdmin＜2 (3)
the fifth lens group has a lens component having positive refractive power on the most diminished side, and satisfies the following conditional expression (4) when the focal length of the lens component is fg5e,
3.6＜fg5e/fw＜6 (4)。
2. the zoom lens for projection according to claim 1,
a combined focal length of the fifth lens group and the sixth lens group at the wide-angle end is fG56, and the following conditional expression (5) is satisfied,
2＜fG56/fw＜5 (5)。
3. the zoom lens for projection according to claim 1 or 2,
the maximum diameter of the light beam at the maximum angle of view at the aperture position is Φ y, the maximum diameter of the light beam on the axis at the aperture position is Φ c, and the minimum value of Φ y/Φ c in the entire zoom region is (Φ y/Φ c) min, the following conditional expression (6) is satisfied,
0.8＜(Φy/Φc)min≤1 (6)。
4. the zoom lens for projection according to claim 1 or 2,
when the distance on the optical axis from the lens surface closest to the enlargement side to the lens surface closest to the reduction side is L, the following conditional expression (7) is satisfied,
0.08＜ImΦ/L＜0.15 (7)。
5. the zoom lens for projection according to claim 1 or 2,
the maximum F value in the entire zoom region of the zoom lens for projection is FNomax, and satisfies the following conditional expression (8),
1.2＜FNomax＜3 (8)。
6. the zoom lens for projection according to claim 1 or 2,
the aperture diameter of the diaphragm is variable.
7. The zoom lens for projection according to claim 1,
satisfies the following conditional expression (1-1),
1＜|ffc/fw|＜1.6 (1-1)。
8. the zoom lens for projection according to claim 1,
in at least a part of a variable magnification region from a wide angle end to a telephoto end, the following conditional expression (2-1) is satisfied,
-0.5＜dd56/ImΦ＜2 (2-1)。
9. the zoom lens for projection according to claim 1,
satisfies the following conditional expression (3-1),
1.45＜fdmax/fdmin＜2 (3-1)。
10. the zoom lens for projection according to claim 1,
satisfies the following conditional expression (4-1),
4＜fg5e/fw＜6 (4-1)。
11. the zoom lens for projection according to claim 2,
satisfies the following conditional expression (5-1),
2＜fG56/fw＜4 (5-1)。
12. the zoom lens for projection according to claim 3,
satisfies the following conditional expression (6-1),
0.85＜(Φy/Φc)min≤1 (6-1)。
13. the zoom lens for projection according to claim 4,
satisfies the following conditional expression (7-1),
0.1＜ImΦ/L＜0.15 (7-1)。
14. the zoom lens for projection according to claim 5,
satisfies the following conditional expression (8-1),
1.5＜FNomax＜3 (8-1)。
15. a projection display device is characterized by comprising:
a light source;
a light valve to which light from the light source is incident; and
the zoom lens according to any one of claims 1 to 14, which is a zoom lens that projects an optical image formed by light modulated by the light valve onto a screen.
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| JP2017027592A JP2018132710A (en) | 2017-02-17 | 2017-02-17 | Zoom lens for projection and projection type display device |
| PCT/JP2018/004272 WO2018150981A1 (en) | 2017-02-17 | 2018-02-07 | Projection zoom lens and projection-type display device |
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| JP2007187879A (en) * | 2006-01-13 | 2007-07-26 | Konica Minolta Photo Imaging Inc | Imaging optical system and imaging apparatus |
| JP2007279077A (en) * | 2006-04-03 | 2007-10-25 | Konica Minolta Opto Inc | Variable power optical system and imaging apparatus |
| JP4919392B2 (en) * | 2006-05-10 | 2012-04-18 | 富士フイルム株式会社 | Projection zoom lens and projection display device |
| JP4957124B2 (en) * | 2006-08-28 | 2012-06-20 | コニカミノルタアドバンストレイヤー株式会社 | Zoom lens |
| JP5345890B2 (en) * | 2009-04-28 | 2013-11-20 | 富士フイルム株式会社 | Projection zoom lens and projection display device |
| CN203799102U (en) * | 2011-10-26 | 2014-08-27 | 富士胶片株式会社 | Projection zoom lens and a projection-type display device |
| TWI479223B (en) * | 2012-06-05 | 2015-04-01 | Delta Electronics Inc | Projection zoom lens |
| WO2014076924A1 (en) * | 2012-11-19 | 2014-05-22 | 富士フイルム株式会社 | Zoom lens for projection and projection-type display device |
| WO2014076923A1 (en) * | 2012-11-19 | 2014-05-22 | 富士フイルム株式会社 | Zoom lens for projection, and projection-type display device |
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