CN108732718B

CN108732718B - Imaging lens

Info

Publication number: CN108732718B
Application number: CN201710270038.4A
Authority: CN
Inventors: 黄俊裕; 杜宇
Original assignee: Shenyang Ruoming Optical Technology Co ltd
Current assignee: Shenyang Ruoming Optical Technology Co., Ltd.
Priority date: 2017-04-24
Filing date: 2017-04-24
Publication date: 2020-09-29
Anticipated expiration: 2037-04-24
Also published as: CN108732718A

Abstract

The invention discloses an imaging lens, which comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, an eighth lens, a ninth lens and a tenth lens which are sequentially arranged from an enlargement side to a reduction side, wherein the first lens, the fourth lens, the fifth lens and the ninth lens respectively have negative diopter, and the second lens, the third lens, the sixth lens, the seventh lens, the eighth lens and the tenth lens respectively have positive diopter. The imaging lens can provide good imaging quality.

Description

Imaging lens

Technical Field

The present disclosure relates to optical elements, and particularly to an imaging lens.

Background

An image capturing device (e.g., a camera) captures an image of an object side by an imaging lens and an image sensor, wherein the imaging lens is used for focusing a light beam from the object side onto the image sensor, and the image sensor is used for sensing the image. In order to fully exhibit the performance of the image sensor, it is necessary to use a good imaging lens, and generally, the good imaging lens needs to have advantages such as low distortion (aberration), low aberration (aberration), and high resolution (resolution) … …. Therefore, how to design an imaging lens providing good imaging quality is a great problem for designers.

Disclosure of Invention

The invention provides an imaging lens to provide good imaging quality.

To achieve the above advantages, the present invention provides an imaging lens including a first lens element, a second lens element, a third lens element, a fourth lens element, a fifth lens element, a sixth lens element, a seventh lens element, an eighth lens element, a ninth lens element, a tenth lens element and an eleventh lens element arranged in sequence from an enlargement side to a reduction side, wherein the first lens element, the fourth lens element, the fifth lens element, the seventh lens element, the eighth lens element, the ninth lens element and the eleventh lens element respectively have a positive refractive power, and the second lens element, the third lens element, the sixth lens element and the tenth lens element respectively have a negative refractive power.

In an embodiment of the invention, the first lens element has a convex surface facing the magnification side, the first lens element is a meniscus convex lens or a plano-convex lens, the second lens element has a concave surface facing the reduction side, the second lens element is a meniscus concave lens, the third lens element has a concave surface facing the reduction side, the third lens element is a plano-concave lens or a meniscus concave lens, the fourth lens element is a biconvex lens or a meniscus convex lens, the fifth lens element is a meniscus convex lens, the sixth lens element and the seventh lens element form a first compound lens, a junction surface between the sixth lens element and the seventh lens element is a curved surface, the eighth lens element is a plano-convex lens, a biconvex lens or a meniscus convex lens, the ninth lens element is a biconvex lens element, the tenth lens element and the eleventh lens element form a second compound lens, and a junction surface between the tenth lens element and the eleventh lens element is a curved surface.

In an embodiment of the invention, the sixth lens element has a concave surface facing the magnification side, and the seventh lens element has a convex surface facing the reduction side.

In an embodiment of the invention, the tenth lens has a concave surface facing the magnification side, and the eleventh lens has a convex surface facing the reduction side.

In an embodiment of the invention, the imaging lens further includes an aperture stop disposed between the fifth lens element and the sixth lens element.

In an embodiment of the invention, the imaging lens includes a twelfth lens element disposed at one of the following positions: between the first lens and the second lens, between the second lens and the third lens, between the third lens and the fourth lens, between the fourth lens and the fifth lens, between the fifth lens and the aperture stop, and between the aperture stop and the sixth lens.

In an embodiment of the invention, the twelfth lens element is disposed between the first lens element and the second lens element, between the third lens element and the fourth lens element, or between the aperture stop and the sixth lens element, and the twelfth lens element has a positive refractive power

In an embodiment of the invention, when the twelfth lens element is disposed between the first lens element and the second lens element, a material of the twelfth lens element includes crown glass.

In an embodiment of the invention, the material of the first lens is not limited, for example, the first lens includes flint glass or crown glass, the second lens includes heavy flint glass, the third lens includes heavy flint glass, the fourth lens includes light crown glass, the fifth lens includes heavy lanthanum flint glass, one of the sixth lens and the seventh lens includes heavy flint glass, the other of the sixth lens and the seventh lens includes light crown glass, one of the eighth lens and the ninth lens includes heavy flint glass, the other of the eighth lens and the ninth lens includes crown glass, one of the tenth lens and the eleventh lens includes heavy flint glass, and the other of the tenth lens and the eleventh lens includes light crown glass.

In an embodiment of the invention, a full field angle of the imaging lens is between 50 degrees and 180 degrees.

The imaging lens of the invention comprises eleven lenses, and the lenses arranged from the magnifying side to the reducing side have diopters and respectively have positive, negative, positive, negative and positive diopters according to the sequence, so the imaging lens can provide good imaging quality.

The foregoing description is only an overview of the technical solutions of the present invention, and in order to make the technical means of the present invention more clearly understood, the present invention may be implemented in accordance with the content of the description, and in order to make the above and other objects, features, and advantages of the present invention more clearly understood, the following preferred embodiments are described in detail with reference to the accompanying drawings.

Drawings

Fig. 1 is a schematic diagram of an imaging lens according to an embodiment of the present invention.

Fig. 2A is an astigmatism and field curvature diagram of an embodiment of the imaging lens of fig. 1.

Fig. 2B is a distortion diagram of an embodiment of the imaging lens of fig. 1.

Fig. 2C is a Modulation Transfer Function (MTF) diagram of an embodiment of the imaging lens of fig. 1.

Fig. 3 is a schematic diagram of an imaging lens according to another embodiment of the present invention.

Fig. 4A is an astigmatism and field curvature diagram of an embodiment of the imaging lens of fig. 3.

Fig. 4B is a distortion diagram of an embodiment of the imaging lens of fig. 3.

Fig. 4C is a modulation transfer function diagram of an embodiment of the imaging lens of fig. 3.

Fig. 5 is a schematic diagram of an imaging lens according to another embodiment of the present invention.

Fig. 6A is an astigmatism and field curvature diagram of an embodiment of the imaging lens of fig. 5.

Fig. 6B is a distortion diagram of an embodiment of the imaging lens of fig. 5.

FIG. 6C is a modulation transfer function diagram of an embodiment of the imaging lens of FIG. 5.

Fig. 7 is a schematic diagram of an imaging lens according to another embodiment of the present invention.

Fig. 8A is an astigmatism and field curvature diagram of an embodiment of the imaging lens of fig. 7.

Fig. 8B is a distortion diagram of an embodiment of the imaging lens of fig. 7.

FIG. 8C is a modulation transfer function diagram of an embodiment of the imaging lens of FIG. 7.

Fig. 9 is a schematic diagram of an imaging lens according to another embodiment of the present invention.

Fig. 10A is an astigmatism and field curvature diagram of an embodiment of the imaging lens of fig. 9.

Fig. 10B is a distortion diagram of an embodiment of the imaging lens of fig. 9.

FIG. 10C is a modulation transfer function diagram of an embodiment of the imaging lens of FIG. 9.

Fig. 11 is a schematic diagram of an imaging lens according to another embodiment of the present invention.

Fig. 12A is an astigmatism and field curvature diagram of the imaging lens of fig. 11 according to an embodiment.

Fig. 12B is a distortion diagram of an embodiment of the imaging lens of fig. 11.

FIG. 12C is a modulation transfer function diagram of an embodiment of the imaging lens of FIG. 11.

Fig. 13 is a schematic diagram of an imaging lens according to another embodiment of the present invention.

Fig. 14A is an astigmatism and field curvature diagram of the imaging lens of fig. 13 according to an embodiment.

Fig. 14B is a distortion diagram of an embodiment of the imaging lens of fig. 13.

FIG. 14C is a modulation transfer function diagram of an embodiment of the imaging lens of FIG. 13.

Detailed Description

The imaging lens of the embodiments of the present invention can be applied to a still or moving image capturing device, including but not limited to a video camera, a monitoring device, a machine vision device, and the like. For example, the imaging lens may also be applied in a projection device. Several embodiments of the imaging lens of the present invention will be described in detail below.

Fig. 1 is a schematic diagram of an imaging lens according to an embodiment of the present invention. Referring to fig. 1, the imaging lens 100 may be a fixed focus lens, and includes a first lens G1, a second lens G2, a third lens G3, a fourth lens G4, a fifth lens G5, a sixth lens G6, a seventh lens G7, an eighth lens G8, a ninth lens G9, a tenth lens G10, and an eleventh lens G11, which are sequentially arranged from an enlargement side to a reduction side, wherein the first lens G1, the fourth lens G4, the fifth lens G5, the seventh lens G7, the eighth lens G8, the ninth lens G9, and the eleventh lens G11 respectively have a positive refractive power, and the second lens G2, the third lens G3, the sixth lens G6, and the tenth lens G10 respectively have a negative refractive power. When the imaging lens 100 is applied to an image capturing device, the element P disposed on the reduction side is, for example, an image sensing element of the image capturing device, and the imaging lens 100 is used to image an object on the enlargement side on the image sensing element. When the imaging lens 100 is applied to a projection apparatus, the element P disposed on the reduction side is, for example, a Light Valve (Light Valve) of the projection apparatus, and the imaging lens 100 is used for projecting an image beam from the Light Valve onto a screen on the enlargement side.

The imaging lens 100 of the present embodiment further includes an aperture stop SA disposed between the fifth lens G5 and the fifth lens G6, for example.

The first lens G1 has, for example, a convex surface facing the magnification side, and the first lens G1 is a meniscus convex lens or a plano-convex lens. For example, the first lens G1 of the present embodiment is, for example, a meniscus convex lens, the surface S1 of the first lens G1 facing the magnification side is a convex curved surface, and the surface S2 facing the reduction side is a concave curved surface. In addition, the material of the first lens G1 can be selected from flint glass or crown glass, but is not limited thereto. In another embodiment, the first lens G1 is, for example, a plano-convex lens, the surface of the first lens G1 facing the magnification side is a convex curved surface, and the surface facing the reduction side is a flat surface. In another embodiment, the first lens G1 may be a biconvex lens, i.e., the surface S1 facing the magnification side and the surface S2 facing the reduction side of the first lens G1 are both convex curved surfaces, for example. In another embodiment, the first lens G1 may have a convex surface facing the reduction side, and the first lens G1 may be a meniscus convex lens, a plano-convex lens, or other convex lens.

In order to change the light beam passing through the first lens G1 from contraction to diffusion, the second lens G2 with a strong refractive power (strong refractive power, generally a glass with a high refractive index, for example, a refractive index higher than 1.8, or a surface type with a strong refractive power, for example, a biconvex lens with a small radius of curvature) is required to be used, while the second lens G2 is a meniscus concave lens, and the second lens G2 has a concave surface facing the reduction side, specifically, the surface S3 facing the enlargement side of the second lens G2 of the present embodiment is a convex surface, and the surface S4 facing the reduction side is a concave surface. In addition, the material of the second lens G2 can be selected to have a high refractive index (here, the high refractive index is generally greater than 1.7), which can diffuse the contracted light beam, and in one embodiment, the material of the second lens G2 can be selected to be a glass material. For example, the material of the second lens G2 includes, for example, heavy flint glass. In another embodiment, the second lens G2 is, for example, a plano-concave lens, the surface of the second lens G2 facing the magnification side is a flat surface, and the surface facing the reduction side is a concave curved surface. In another embodiment, the second lens G2 can also be a biconcave lens, i.e., the surface S3 facing the magnification side and the surface S4 facing the reduction side of the second lens G2 are both concave curved surfaces, for example.

The third lens G3 has, for example, a concave surface facing the reduction side, and the third lens G3 is a plano-concave lens or a meniscus concave lens. For example, the third lens G3 of the present embodiment is a plano-concave lens, the surface S5 of the third lens G3 facing the enlargement side is a flat surface, and the surface S6 facing the reduction side is a concave curved surface. In addition, the material of the third lens G3 can be flint glass, and in an embodiment, the material of the third lens G3 is, for example, heavy flint glass, which can be used to correct chromatic aberration, but is not limited thereto. In addition, in other embodiments, the third lens G3 may also be a meniscus concave lens or a double concave lens according to design requirements.

The fourth lens element G4 and the fifth lens element G5 are used to contract the diffused light beam, the fourth lens element G4 is a double convex lens or a meniscus convex lens, and the fifth lens element G5 is a meniscus convex lens. Specifically, the fourth lens G4 of the present embodiment is, for example, a biconvex lens, i.e., the surface S7 facing the magnification side and the surface S8 facing the reduction side of the fourth lens G4 are, for example, both convex curved surfaces. In addition, the material of the fourth lens G4 can be selected from crown glass, and the material of the fourth lens G4 can also reduce the cost. In one embodiment, the material of the fourth lens G4 is, for example, light crown glass. In addition, in other embodiments, the fourth lens G4 may also be a meniscus convex lens, a plano-convex lens or other convex lenses.

A surface S9 of the fifth lens G5 facing the enlargement side of the present embodiment is, for example, a convex curved surface, and a surface S10 facing the reduction side is a concave curved surface. In addition, the material of the fifth lens G5 may be heavy flint glass, which can diffuse the contracted light beam, for example, the material of the fifth lens G5 may include heavy lanthanum flint glass. In another embodiment, the fifth lens G5 may be a plano-convex lens according to design requirements.

The sixth lens G6 and the seventh lens G7 form a first compound lens C1, and a junction surface S12 between the sixth lens G6 and the seventh lens G7 is a plane or a curved surface. For example, the joint surface S12 of the present embodiment is a curved surface protruding to the enlargement side, the sixth lens G6 and the seventh lens G7 have a surface curved toward the reduction side, respectively, i.e., the sixth lens G6 has a concave surface (surface S11) toward the enlargement side, the seventh lens G7 has a convex surface (surface S13) toward the reduction side, wherein the concave surface is a concave curved surface, for example, and the convex surface is a convex curved surface, for example. Further, the sixth lens G6 and the seventh lens G7 constitute a first compound lens C1 by, for example, gluing.

The joining surface S12 may be adjusted in accordance with the case where the light flux enters the pupil from the aperture stop SA (here, the pupil generally refers to the aperture stop, and the portion before the aperture stop is the entrance pupil and the portion after the aperture stop is the exit pupil), and the joining surface S12 may be made to be a curved surface or a flat surface convex toward the reduction side.

The materials of the sixth lens G6 and the seventh lens G7 may be a combination of two glasses having a large difference in refractive index and abbe number. For example, the refractive index difference between the materials of the sixth lens G6 and the seventh lens G7 is greater than 0.2, and the abbe number difference between the materials of the sixth lens G6 and the seventh lens G7 is greater than 20. Specifically, the material of one of the sixth lens G6 and the seventh lens G7 includes flint glass, and the material of the other of the sixth lens G6 and the seventh lens G7 includes light crown glass. For example, the material of the sixth lens G6 is flint glass, and the material of the seventh lens G7 is light crown glass. In another embodiment, the material of the sixth lens G6 is light crown glass, and the material of the seventh lens G7 is flint glass. In addition, in an embodiment, the flint glass is, for example, heavy flint glass.

In addition, in other embodiments, the joining surface S12 may be a curved surface or a flat surface protruding toward the reduced side.

The eighth lens G8 is, for example, a plano-convex lens, a biconvex lens, or a meniscus convex lens, specifically, the eighth lens G8 of the present embodiment is, for example, a plano-convex lens, a surface S14 of the eighth lens G8 facing the enlargement side is, for example, a convex curved surface, and a surface S15 facing the reduction side is a plane. In addition, in other embodiments, the eighth lens G8 may also be a double convex lens or a meniscus convex lens according to design requirements.

The ninth lens G9 is, for example, a biconvex lens or a meniscus convex lens, specifically, the ninth lens G9 of the present embodiment is, for example, a biconvex lens, that is, the surface S16 facing the magnification side and the surface S17 facing the reduction side of the ninth lens G9 are, for example, both convex curved surfaces. In another embodiment, the ninth lens G9 may also be a meniscus convex lens or a plano-convex lens.

The material of one of the eighth lens G8 and the ninth lens G9 includes flint glass, and the material of the other of the eighth lens G8 and the ninth lens G9 includes crown glass. For example, the material of the eighth lens G8 is, for example, heavy flint glass, and the material of the ninth lens G9 is, for example, crown glass. In another embodiment, the material of the eighth lens G8 is crown glass, and the material of the ninth lens G9 is flint glass.

The tenth lens G10 and the eleventh lens G11 constitute, for example, a second compound lens C2, and a junction surface S19 between the tenth lens G10 and the eleventh lens G11 is a flat surface or a curved surface. For example, the joint surface S19 of the present embodiment is a curved surface protruding to the enlargement side, the tenth lens G10 and the eleventh lens G11 have a surface curved toward the reduction side, respectively, i.e., the tenth lens G10 has a concave surface (surface S18) toward the enlargement side, the eleventh lens G11 has a convex surface (surface S20) toward the reduction side, wherein the concave surface is a concave curved surface, for example, and the convex surface is a convex curved surface, for example. Further, the tenth lens G10 and the eleventh lens G11 constitute a second compound lens C2 by, for example, gluing.

The tenth lens G10 and the eleventh lens G11 may be made of a combination of two glasses having a large difference in refractive index and abbe number. For example, the refractive index difference between the materials of the tenth lens G10 and the eleventh lens G11 is greater than 0.2, and the abbe number difference between the materials of the tenth lens G10 and the eleventh lens G11 is greater than 20. Specifically, the material of one of the tenth lens G10 and the eleventh lens G11 includes, for example, heavy flint glass, and the material of the other of the tenth lens G10 and the eleventh lens G11 includes, for example, light crown glass. For example, the material of the tenth lens G10 is, for example, heavy flint glass, and the material of the eleventh lens G11 is, for example, light crown glass. In another embodiment, the material of the tenth lens G10 is light crown glass, and the material of the eleventh lens G11 is heavy flint glass.

In other embodiments, the joining surface S19 may be a curved surface or a flat surface protruding toward the reduced side.

The first lens G1, the fourth lens G4, the fifth lens G5, the seventh lens G7, the eighth lens G8, the ninth lens G9 and the eleventh lens G11 listed above may be replaced with other kinds of concave lenses according to design requirements, for example: meniscus concave lenses, plano-concave lenses, biconcave lenses, and the like. In addition, the second lens G2, the third lens G3, the sixth lens G6 and the tenth lens listed above can be replaced by other kinds of convex lenses according to design requirements, for example: meniscus convex lenses, plano-convex lenses, biconvex lenses, and the like. In addition, the full field angle of the imaging lens 100 of the present embodiment is, for example, between 50 degrees and 180 degrees, but not limited thereto.

The imaging lens 100 of the present embodiment includes eleven lenses, and since the lenses arranged from the magnification side to the reduction side all have diopters and have positive, negative, positive, negative, and positive diopters according to the sequence, the imaging lens can provide good imaging quality.

Table one will give an example of the parameters of the imaging lens 100. It should be noted that the data listed in the table i is not intended to limit the present invention, and any person skilled in the art can make appropriate changes to the parameters or settings of the table i after referring to the present invention, and still fall within the scope of the present invention.

Watch 1

The pitch indicated in table one is the linear distance between two adjacent surfaces on the optical axis 150 of the imaging lens 100. For example, the distance between the surface S1 and the surface S1 is the linear distance between the surface S2 and the optical axis 150, and the distance between the surface S20 is the linear distance between the surface S20 and the element P on the optical axis 150. A surface with a positive radius of curvature represents that the surface curves toward the enlargement side, and a surface with a negative radius of curvature represents that the surface curves toward the reduction side.

Fig. 2A is an astigmatism and field curvature diagram of an embodiment of the imaging lens of fig. 1, fig. 2B is a distortion diagram of an embodiment of the imaging lens of fig. 1, and fig. 2C is a modulation transfer function diagram of an embodiment of the imaging lens of fig. 1. As shown in fig. 2A to 2C, the imaging lens 100 of the present embodiment can provide good imaging quality.

In other embodiments, the distance between the lenses, the distance between the lens and the magnifying side, and the distance between the lens and the shrinking side can be adjusted according to design requirements to accommodate one or more other lenses, and can be configured in one of the following positions: between the magnification side and the first lens G1, between the first lens G1 and the second lens G2, between the third lens G3 and the fourth lens G4, between the fourth lens G4 and the fifth lens G5, between the fifth lens G5 and the aperture stop SA, and between the aperture stop SA and the sixth lens G6. Specifically, one or more lenses may be provided at each of the positions. Various embodiments are described below with reference to the accompanying drawings.

Fig. 3 is a schematic diagram of an imaging lens according to another embodiment of the present invention. Referring to fig. 3, an imaging lens 100a of the present embodiment is similar to the imaging lens 100 of fig. 1, and the main difference is that the imaging lens 100a further includes a twelfth lens G12 disposed between the first lens G1 and the second lens G2.

In the present embodiment, the twelfth lens element G12 has, for example, positive refractive power, so in some super-large aperture or wide-angle applications, the imaging lens 100a can be used to eliminate the residual aberration generated after diffusing the light beam. Specifically, the twelfth lens G12 of the present embodiment is a convex meniscus lens, in which the surface S21 of the twelfth lens G12 facing the magnification side is a convex curved surface and the surface S22 of the twelfth lens G12 facing the reduction side is a concave curved surface, and in other embodiments, the twelfth lens G12 is not limited to a convex meniscus lens, and the twelfth lens G12 may be other kinds of convex lenses, for example: plano-convex lenses, biconvex lenses, and the like. As shown in fig. 3, the third lens G3 'of the present embodiment is, for example, a meniscus concave lens, that is, the surface S5' of the third lens G3 'facing the enlargement side is, for example, a convex curved surface, and the surfaces S6' facing the reduction side are, for example, concave curved surfaces, but may be other types of concave lenses, and may be other types of concave lenses, for example, a plano-concave lens, a biconcave lens, or the like. On the other hand, the eighth lens G8 'of the present embodiment is, for example, a biconvex lens, that is, the surface S14' facing the enlargement side and the surface S15 'facing the reduction side of the eighth lens G8' are, for example, both convex surfaces, but may be other types of convex lenses, for example, a meniscus convex lens, a plano-convex lens, or the like. In other embodiments, the twelfth lens G12 may be disposed between the first lens G1 and the magnifying side, or one lens having positive refractive power may be added to each of both sides of the first lens G1.

The twelfth lens G12 is disposed between the first lens G1 and the magnification side or between the first lens G1 and the second lens G2, and the material of the twelfth lens G12 includes crown glass, for example. In one embodiment, the crown glass includes light crown glass or fluorine crown glass, but not limited thereto.

Table two will give an example of the parameters of the imaging lens 100 a. It should be noted that the data listed in the second table are not intended to limit the present invention, and those skilled in the art can make appropriate changes to the parameters or settings of the second table after referring to the present invention, which still fall within the scope of the present invention.

Watch two

Fig. 4A is an astigmatism and field curvature diagram of an embodiment of the imaging lens of fig. 3, fig. 4B is a distortion diagram of an embodiment of the imaging lens of fig. 3, and fig. 4C is a modulation transfer function diagram of an embodiment of the imaging lens of fig. 3. As shown in fig. 4A to 4C, the imaging lens 100a of the present embodiment can be adapted to eliminate residual aberration to provide good imaging quality.

Fig. 5 is a schematic diagram of an imaging lens according to another embodiment of the present invention. Referring to fig. 5, an imaging lens 100b of the present embodiment is similar to the imaging lens 100 of fig. 1, and the main difference is that the imaging lens 100b further includes a twelfth lens G13 disposed between the third lens G3 and the fourth lens G4.

In the present embodiment, the twelfth lens G13 has, for example, positive refractive power. Specifically, the twelfth lens G13 of the present embodiment is a biconvex lens, that is, the surface S23 facing the enlargement side and the surface S24 facing the reduction side of the twelfth lens G13 are both convex curved surfaces, for example. In addition, in other embodiments, the twelfth lens G13 is not limited to a biconvex lens, and the twelfth lens G13 may be other kinds of convex lenses, for example: plano-convex lenses, meniscus-convex lenses, and the like. In other embodiments, the twelfth lens element G13 may be disposed between the fourth lens element G4 and the fifth lens element G5, or one lens element with positive refractive power may be added on each side of the fourth lens element G4. As shown in fig. 5, the third lens G3 'of the present embodiment is, for example, a biconcave lens, i.e., the surface S5' facing the enlargement side and the surface S6 'facing the reduction side of the third lens G3' are, for example, both concave curved surfaces, but may be other types of concave lenses. On the other hand, the eighth lens G8' of the present embodiment is similar to the design of fig. 3, and will not be repeated here.

Table three will give an example of the parameters of the imaging lens 100 b. It should be noted that the data listed in table three are not intended to limit the present invention, and those skilled in the art can make appropriate changes to the parameters or settings of the present invention without departing from the scope of the present invention.

Watch III

Fig. 6A is an astigmatism and field curvature diagram of an embodiment of the imaging lens of fig. 5, fig. 6B is a distortion diagram of an embodiment of the imaging lens of fig. 5, and fig. 6C is a modulation transfer function diagram of an embodiment of the imaging lens of fig. 5. As shown in fig. 6A to 6C, the imaging lens 100b of the present embodiment can be adapted to provide good imaging quality.

Fig. 7 is a schematic diagram of an imaging lens according to another embodiment of the present invention. Referring to fig. 7, an imaging lens 100c of the present embodiment is similar to the imaging lens 100 of fig. 1, and the main difference is that the imaging lens 100c further includes a twelfth lens G14 disposed between the aperture stop SA and the sixth lens G6.

In the present embodiment, the twelfth lens G14 has, for example, positive refractive power. Specifically, the twelfth lens G14 of the present embodiment is a convex meniscus lens, the surface S25 of the twelfth lens G14 facing the magnification side is a concave curved surface, and the surface S26 facing the reduction side is, for example, a convex curved surface, and in other embodiments, the twelfth lens G14 is not limited to a convex meniscus lens, and the twelfth lens G14 may be other kinds of convex lenses, for example: plano-convex lenses, biconvex lenses, and the like. In other embodiments, the twelfth lens G14 may be disposed between the fifth lens G5 and the aperture stop SA, or one lens with positive refractive power may be added on each side of the aperture stop SA. In addition, as shown in fig. 7, the third lens G3 ″ and the eighth lens G8' of the present embodiment are similar to the design of fig. 5, and will not be repeated here.

Table four will give an example of the parameters of the imaging lens 100 c. It should be noted that the data listed in table four are not intended to limit the present invention, and those skilled in the art can make appropriate changes to the parameters or settings of the present invention without departing from the scope of the present invention.

Watch four

Fig. 8A is an astigmatism and field curvature diagram of an embodiment of the imaging lens of fig. 7, fig. 8B is a distortion diagram of an embodiment of the imaging lens of fig. 7, and fig. 8C is a modulation transfer function diagram of an embodiment of the imaging lens of fig. 7. As shown in fig. 8A to 8C, the imaging lens 100C of the present embodiment is suitable for eliminating the aberration caused by the too large incident angle of the light beam, so as to provide good imaging quality.

Fig. 9 is a schematic diagram of an imaging lens according to another embodiment of the present invention. Referring to fig. 9, an imaging lens 100d of the present embodiment is similar to the imaging lens 100 of fig. 1, and the main difference is that the imaging lens 100d further includes a twelfth lens G15 disposed between the third lens G3 and the fourth lens G4.

In the present embodiment, the twelfth lens G15 has, for example, a negative refractive power. Specifically, the twelfth lens G15 of the present embodiment is a meniscus concave lens, the surface S27 of the twelfth lens G15 facing the magnification side is a convex curved surface, and the surface S28 facing the reduction side is, for example, a concave curved surface, and in other embodiments, the twelfth lens G15 is not limited to a meniscus concave lens, and the twelfth lens G15 may be another kind of concave lens, for example: plano-concave lenses, biconcave lenses, and the like. In addition, as shown in fig. 9, the third lens G3 'and the eighth lens G8' of the present embodiment are similar to the design of fig. 3, and will not be repeated here.

Table five will give an example of the parameters of the imaging lens 100 d. It should be noted that the data shown in the table v is not intended to limit the present invention, and any person skilled in the art can make appropriate changes to the parameters or settings of the table v after referring to the present invention, which still fall within the scope of the present invention.

Watch five

Fig. 10A is an astigmatism and field curvature diagram of an embodiment of the imaging lens of fig. 9, fig. 10B is a distortion diagram of an embodiment of the imaging lens of fig. 9, and fig. 10C is a modulation transfer function diagram of an embodiment of the imaging lens of fig. 9. As shown in fig. 10A to 10C, the imaging lens 100d of the present embodiment is suitable for eliminating the aberration caused by the too large incident angle of the light beam, so as to provide good imaging quality.

Fig. 11 is a schematic diagram of an imaging lens according to another embodiment of the present invention. Referring to fig. 11, an imaging lens 100e of the present embodiment is similar to the imaging lens 100 of fig. 1, and the main difference is that the imaging lens 100e further includes a twelfth lens G16 disposed between the fourth lens G4 and the fifth lens G5.

Specifically, the twelfth lens G16 of the present embodiment has, for example, positive refractive power. Specifically, the twelfth lens G16 of the present embodiment is a biconvex lens, that is, the surface S29 facing the enlargement side and the surface S30 facing the reduction side of the twelfth lens G16 are, for example, convex curved surfaces, and in other embodiments, the twelfth lens G16 is not limited to a biconvex lens, and the twelfth lens G16 may be other kinds of convex lenses, for example: meniscus convex lenses, plano-convex lenses, and the like. In addition, as shown in fig. 11, the third lens G3 ″ of the present embodiment is similar to the design of fig. 5, and will not be repeated here. On the other hand, the eighth lens G8 ″ of the present embodiment is, for example, a meniscus convex lens, that is, the surface S14 ″ facing the enlargement side of the eighth lens G8 ″ is, for example, a convex curved surface, and the surface S15 ″ facing the reduction side is, for example, a concave curved surface, but may be other kinds of convex lenses.

Table six will give an example of the parameters of the imaging lens 100 e. It should be noted that the data listed in table six are not intended to limit the present invention, and any person skilled in the art can make appropriate changes to the parameters or settings after referring to the present invention, and still fall within the scope of the present invention.

Watch six

Fig. 12A is an astigmatism and field curvature diagram of an embodiment of the imaging lens of fig. 11, fig. 12B is a distortion diagram of an embodiment of the imaging lens of fig. 11, and fig. 12C is a modulation transfer function diagram of an embodiment of the imaging lens of fig. 11. As shown in fig. 12A to 12C, the imaging lens 100e of the present embodiment is suitable for eliminating the aberration caused by the too large incident angle of the light beam, so as to provide good imaging quality.

Fig. 13 is a schematic diagram of an imaging lens according to another embodiment of the present invention. Referring to fig. 13, an imaging lens 100f of the present embodiment is similar to the imaging lens 100 of fig. 1, and the main difference is that the imaging lens 100f further includes a twelfth lens G17 disposed between the fifth lens G5 and the aperture stop SA.

In the present embodiment, the twelfth lens G17 has, for example, positive refractive power. Specifically, the twelfth lens G17 of the present embodiment is a convex meniscus lens, the surface S31 of the twelfth lens G17 facing the magnification side is a convex curved surface, and the surface S32 facing the reduction side is, for example, a concave curved surface, and in other embodiments, the twelfth lens G17 is not limited to a convex meniscus lens, and the twelfth lens G17 may be other kinds of convex lenses, for example: plano-convex lenses, biconvex lenses, and the like. In addition, as shown in fig. 13, the third lens G3 ″ and the eighth lens G8' of the present embodiment are similar to the design of fig. 5, and will not be repeated here.

Table seven will give an example of the parameters of the imaging lens 100 f. It should be noted that the data shown in the table seven are not intended to limit the present invention, and any person skilled in the art can make appropriate changes to the parameters or settings after referring to the present invention, which still fall within the scope of the present invention.

Watch seven

Fig. 14A is an astigmatism and field curvature diagram of an embodiment of the imaging lens of fig. 13, fig. 14B is a distortion diagram of an embodiment of the imaging lens of fig. 13, and fig. 14C is a modulation transfer function diagram of an embodiment of the imaging lens of fig. 13. As shown in fig. 14A to 14C, the imaging lens 100f of the present embodiment is suitable for eliminating the aberration caused by the too large incident angle of the light beam, so as to provide good imaging quality.

In addition to the other lens configurations listed in the above embodiments, in other embodiments, the twelfth lens element may also be disposed between the second lens element G2 and the third lens element G3 to reduce the effect of the light beam spreading through the second lens element G2, so that the imaging lens has good imaging quality. In addition, in other embodiments, a lens with positive refractive power may be additionally provided on each of two sides of the second lens G2.

The imaging lens of the embodiment of the invention comprises eleven lenses, and the lenses arranged from the magnification side to the reduction side have diopters and respectively have positive, negative, positive, negative and positive diopters according to the sequence, so the imaging lens can provide good imaging quality. In addition, the imaging lens of the embodiment of the invention can further comprise one or more pieces of other lenses, so that the imaging lens is also favorable for providing good imaging quality.

Although the present invention has been described with reference to a preferred embodiment, it should be understood that various changes, substitutions and alterations can be made herein without departing from the spirit and scope of the invention as defined by the appended claims.

Claims

1. An imaging lens including a first lens element, a second lens element, a third lens element, a fourth lens element, a fifth lens element, a sixth lens element, a seventh lens element, an eighth lens element, a ninth lens element, a tenth lens element and an eleventh lens element arranged in sequence from an enlargement side to a reduction side, wherein the first lens element, the fourth lens element, the fifth lens element, the seventh lens element, the eighth lens element, the ninth lens element and the eleventh lens element each have a positive refractive power, and the second lens element, the third lens element, the sixth lens element and the tenth lens element each have a negative refractive power;

the first lens is provided with a convex surface facing the amplification side, and the first lens is a meniscus convex lens or a plano-convex lens; the second lens is provided with a concave surface facing the reduction side, and is a meniscus concave lens; the third lens is provided with a concave surface facing the reduction side, and is a plano-concave lens, a biconcave lens or a meniscus concave lens; the fourth lens is a biconvex lens or a meniscus convex lens; the fifth lens is a meniscus convex lens; the sixth lens and the seventh lens form a first compound lens, and the joint surface of the sixth lens and the seventh lens is a curved surface; the eighth lens is a plano-convex lens, a biconvex lens or a meniscus convex lens; the ninth lens is a biconvex lens; the tenth lens and the eleventh lens form a second compound lens, and a joint surface of the tenth lens and the eleventh lens is a curved surface.

2. The imaging lens assembly of claim 1 wherein the sixth lens element has a concave surface facing the magnification side and the seventh lens element has a convex surface facing the reduction side.

3. The imaging lens assembly of claim 1 wherein the tenth lens element has a concave surface facing the magnification side and the eleventh lens element has a convex surface facing the reduction side.

4. The imaging lens of claim 1 further comprising an aperture stop disposed between the fifth lens element and the sixth lens element.

5. The imaging lens assembly of claim 4 further comprising a twelfth lens element disposed in one of: between the first lens and the second lens, between the second lens and the third lens, between the third lens and the fourth lens, between the fourth lens and the fifth lens, between the fifth lens and the aperture stop, between the aperture stop and the sixth lens.

6. The imaging lens according to claim 5, wherein the twelfth lens is disposed between the first lens and the second lens, between the third lens and the fourth lens, or between the aperture stop and the sixth lens, the twelfth lens having a positive refractive power.

7. The imaging lens as claimed in claim 6, wherein when the twelfth lens is disposed between the first lens and the second lens, the material of the twelfth lens comprises crown glass.

8. The imaging lens of claim 1 wherein the material of the first lens comprises flint glass or crown glass; the material of the second lens comprises heavy flint glass; the material of the third lens comprises heavy flint glass; the material of the fourth lens comprises light crown glass; the material of the fifth lens comprises heavy lanthanum flint glass; the material of one of the sixth lens and the seventh lens comprises heavy flint glass, and the material of the other of the sixth lens and the seventh lens comprises light crown glass; the material of one of the eighth lens and the ninth lens comprises heavy flint glass, and the material of the other of the eighth lens and the ninth lens comprises crown glass; the material of one of the tenth lens and the eleventh lens comprises heavy flint glass, and the material of the other of the tenth lens and the eleventh lens comprises light crown glass.

9. The imaging lens of claim 1, wherein a full field angle of the imaging lens is between 50 degrees and 180 degrees.