CN113721352B - Micro-distance deformed wide screen lens and digital camera and video camera with same - Google Patents
Micro-distance deformed wide screen lens and digital camera and video camera with same Download PDFInfo
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- CN113721352B CN113721352B CN202111022324.1A CN202111022324A CN113721352B CN 113721352 B CN113721352 B CN 113721352B CN 202111022324 A CN202111022324 A CN 202111022324A CN 113721352 B CN113721352 B CN 113721352B
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Abstract
The invention belongs to the technical field of optical devices, and particularly relates to a micro-distance deformation wide screen lens and a digital camera or video camera with the micro-distance deformation wide screen lens, wherein the micro-distance deformation wide screen lens sequentially comprises a first lens group GFc0 with negative diopter from an object side to an image plane side, a cylindrical lens group G1 with diopter in a Y direction, a cylindrical lens group G2 with diopter in an X direction and a positive lens group G3; when an object moves from infinity to a close distance, a first negative diopter lens group GFc1 and a fifth negative diopter lens group GFc5 in a first lens group GFc0 are fixed, a space L1 between a second positive diopter lens group GFc2 and a third negative diopter lens group GFc3 is changed to be small by a large size, and a space L2 between a fourth positive diopter lens group GFc4 and a fifth negative diopter lens group GFc5 is changed to be small by a large size to realize focusing; the invention has the advantages of high performance, small volume and low cost, the deformation ratio can reach more than 1.33 times, the function of micro-distance of about 0.5 times is realized, the excellent micro-distance photographic performance is realized, and the elliptic facula required by artistic creation is realized after scaling.
Description
Technical Field
The invention belongs to the technical field of optical devices, and particularly relates to a micro-distance deformation wide screen lens and a digital camera or video camera with the same.
Background
In recent years, with the advance of high image quality of movie cameras, digital camera systems are becoming popular, the frames are in a format of 4:3 and 16:9, but cinema screens are in a ratio of 2.35:1 and 2.6:1 or more, so that when the movie cameras are played, the movie cameras need to be cut up and down to reach the length-width ratio so as to meet the visual habit of human eyes; therefore, the up-and-down clipping also can lose a lot of effective pixels, and the image quality is reduced, so that the market has more and more demands on the deformable lens with high performance and high compression ratio, and meanwhile, when shooting detail scenes such as small objects, the deformable wide screen lens with micro-distance shooting capability is also required, and the demands are more and more strong.
The currently known deformed wide-screen lens patent is that, as described in japanese patent laid-open No. 8-184759, a cylindrical lens group with a 1.33 times deformation ratio is located between group 4G 4 and group 5 and also between the diaphragm and the image plane, so that although miniaturization is easy to realize, the space is limited, large-magnification deformation is difficult to realize, and meanwhile, because of deformation, the diameters of the beam X and Y directions on the shaft are different, the X and Y directions of the aperture Fno are different; in addition, when shooting, the out-of-focus optical shift is elliptical, and when in actual projection, the optical shift is scaled and restored to be circular light spots, so that the artistic creation requirement of the elliptical light spots generated by the deformed lens cannot be obtained, meanwhile, the focusing movement space is smaller, the high-magnification micro-distance photographic effect cannot be realized, the focusing group is too simple, and the high-performance micro-distance photographic image quality cannot be realized.
As described in japanese patent laid-open No. 2005-221597, in example 1, a cylindrical lens group having a 1.33 times distortion ratio is placed between a diaphragm and an image surface, and the artistic creation demand of an elliptical spot is similarly generated, but in example 2, although the cylindrical lens having a distortion ratio is placed at the forefront end, the focal lengths in the horizontal X-direction and the vertical Y-direction are different due to the characteristics of the cylindrical lens, and when the cylindrical lens is placed at the forefront end, although the imaging point is uniform at infinity, a good imaging effect is obtained, but when an object is moved to a certain close distance, the focal lengths in the X-and Y-directions are different, which inevitably results in different image point positions, and once the depth of field is exceeded, X and Y are easily caused to be rapidly reduced due to the inconsistent image point positions, so that the near-photographing performance of such a structure is poor, and the micro-distance photographing effect is further not achieved.
Disclosure of Invention
The invention aims to solve the problem that the traditional deformed wide screen lens cannot realize high-performance and high-magnification micro-distance photographic effect, and provides the micro-distance deformed wide screen lens with the length-width deformation ratio of more than 1.33 times and the photographic magnification of about 0.5 times.
In order to achieve the above purpose, the invention is realized by adopting the following technical scheme:
the micro-distance deformed wide-screen lens sequentially comprises a first lens group GFc0 with negative diopter, a cylindrical lens group G1 with diopter in the Y direction, a cylindrical lens group G2 with diopter in the X direction and a positive lens group G3 from the object side to the image side;
The first lens group GFc0 comprises a first negative diopter lens group GFc1, a second positive diopter lens group GFc2, a third negative diopter lens group GFc3, a fourth positive diopter lens group GFc4 and a fifth negative diopter lens group GFc5 from the object side to the image plane side in sequence;
The aperture S is arranged in the positive lens group G3;
When an object moves from infinity to a close distance, a first negative diopter lens group GFc1 and a fifth negative diopter lens group GFc5 in the first lens group GFc0 are fixed, an interval L1 between a second positive diopter lens group GFc2 and a third negative diopter lens group GFc3 is changed from large to small, and an interval L2 between a fourth positive diopter lens group GFc4 and a fifth negative diopter lens group GFc5 is changed from large to small to achieve a focusing function;
Preferably, the macro distortion wide screen lens further satisfies the following conditional expression:
0.5≤Fy/Fc2≤1.2 (1)
0.5≤Fy/Fc4≤1.2 (2)
wherein, fy: an infinity state, a Y-direction focal length of the entire optical system;
fc2: a focal distance of the second positive refractive power lens group GFc2 in the first lens group GFc 0;
fc4: the focal distance of the fourth positive refractive power lens group GFc4 in the first lens group GFc 0.
Preferably, the macro distortion wide screen lens further satisfies the following conditional expression:
2.5≤Fy/(L1A-L1B)≤7 (3)
wherein, fy: an infinity state, a Y-direction focal length of the entire optical system;
L1A: in the infinity state, the separation distance between the second positive refractive power lens group GFc2 and the third negative refractive power lens group GFc3 in the first lens group GFc 0;
L1B: in the closest shooting distance state, the second positive refractive power lens group GFc2 and the third negative refractive power lens group GFc3 in the first lens group GFc0 are spaced apart.
Preferably, the macro distortion wide screen lens further satisfies the following conditional expression:
3≤Fy/(L2A-L2B)≤6 (4)
wherein, fy: an infinity state, a Y-direction focal length of the entire optical system;
L2A: in the infinity state, the distance between the fourth positive refractive power lens group GFc4 and the fifth negative refractive power lens group GFc5 in the first lens group GFc 0;
L2B: in the closest shooting distance state, the fourth positive refractive power lens group GFc4 and the fifth negative refractive power lens group GFc5 in the first lens group GFc0 are spaced apart.
The macro distortion wide screen lens provided by the invention has weaker diopter of the focusing group GFc2, namely the second positive diopter lens group GFc2, if the lower limit of the conditional expression (1) is exceeded, and the performance is relatively easy to realize, but the macro photographing function is realized, the movement amount is greatly increased, and the miniaturization is very difficult to realize. If the upper limit of the condition (1) is exceeded, that is, the diopter of the focusing group GFc2, that is, the second positive diopter lens group GFc2 is too strong, although the macro photographing function is easily realized and the miniaturization is relatively easy, various aberrations are generated due to the too strong diopter, the performance is hardly ensured, and particularly, the aberrations such as chromatic dispersion, coma and the like are greatly increased.
If the lower limit of the conditional expression (2) is exceeded, that is, the diopter of the focusing group GFc4, that is, the fourth positive diopter lens group GFc4 is weak, the performance is relatively easy to realize, but it is very difficult to realize miniaturization by greatly increasing the movement amount in order to realize the macro photographing function. If the upper limit of the conditional expression (2) is exceeded, that is, the diopter of the focusing group GFc4, that is, the fourth positive diopter lens group GFc4 is too strong, although the macro photographing function is easily realized and the miniaturization is relatively easy, various aberrations are generated due to the too strong diopter, the performance is hardly ensured, and particularly, the aberrations such as chromatic dispersion, coma and the like are greatly increased.
If the lower limit of the conditional expression (3) is exceeded, the shift amounts of the focus groups GFc2 and GFc3, that is, the second positive refractive power lens group GFc2 and the third negative refractive power lens group GFc3, are excessively large, and although the performance is easy to achieve, the shift amounts are excessively large, which may cause difficulty in miniaturization and lose the effect of practicality. If the upper limit of the conditional expression (3) is exceeded, the movement amounts of the focus groups GFc2 and GFc3, that is, the second positive diopter lens group GFc2 and the third negative diopter lens group GFc3 are small, although miniaturization is easy to achieve, it is difficult to achieve a high magnification photographic effect, and at the same time, because the movement amount is small, achieving a high magnification macro photographic effect necessarily results in an excessively strong refraction of the focus groups, which leads to a sharp increase in various aberrations, so that performance cannot be ensured.
If the lower limit of the conditional expression (4) is exceeded, the amount of movement of the focusing group GFc4, that is, the fourth positive refractive power lens group GFc4 is excessively large, which is easy to achieve in terms of performance, but because the amount of movement is excessively large, miniaturization is difficult, and the effect of practicality is lost. If the upper limit of the conditional expression (4) is exceeded, the amount of movement of the focusing group GFc4, that is, the fourth positive refractive power lens group GFc4 is small, although miniaturization is easy to achieve, it is difficult to achieve a high magnification photographic effect, and at the same time, because the amount of movement is small, achieving a high magnification macro photographic effect necessarily results in an excessively strong refraction of the focusing group, which leads to a rapid increase in various aberrations, so that performance cannot be ensured.
The invention also provides a digital camera with the micro-distance deformed wide screen lens.
The invention also provides a digital video camera which is provided with the micro-distance deformation wide screen lens.
Compared with the prior art, the invention has the following technical effects:
The invention provides a micro-distance deformation wide screen lens, the shooting effect is shown in figure 1, the round object is imaged on the image surface after shooting and is horizontally compressed to become an elliptical image, and simultaneously elliptical light spots required by artistic creation are provided, because the optimized focusing group GFc is arranged in front of the cylindrical lens group, not only can the high-performance micro-distance photographic effect be realized, but also the upper light angle received by the cylindrical lens can be ensured to be unchanged all the time, the long-distance deformation ratio and the short-distance deformation ratio can be ensured to be unchanged, and good imaging can be realized at all the distances.
The micro-distance deformed wide screen lens provided by the invention has the advantages of high performance, small volume, low cost and deformation ratio of more than 1.33 times, has the micro-distance function of about 0.5 times, has good micro-distance photographic performance, and has elliptical light spots required by artistic creation after scaling.
Additional features and advantages of the invention will be set forth in the detailed description which follows.
Drawings
Fig. 1 is a schematic diagram of a round object imaged by a macro distortion wide screen lens according to the present invention;
fig. 2 shows YZ and XZ views of a macro distortion wide screen lens provided in embodiment 1 of the present invention;
Fig. 3 shows spherical aberration, curvature of field, distortion aberration and chromatic aberration of magnification in the Y direction and the X direction at a short distance, which are endless in embodiment 1 of the present invention;
Fig. 4 shows YZ and XZ views of a macro distortion wide screen lens provided in embodiment 2 of the present invention;
fig. 5 shows spherical aberration, field curvature aberration, distortion aberration, and chromatic aberration of magnification in Y and X directions for infinity, close distance, and closed distance for example 2 of the present invention.
Detailed Description
In order that the manner in which the invention is practiced, as well as the features and objects and advantages thereof, will be readily understood and appreciated, a more particular description of the invention will be rendered by reference to specific embodiments thereof which are illustrated in the appended drawings.
Fig. 1 is a schematic diagram of a round object imaged by the macro deformation wide screen lens provided by the invention, the round object imaged is horizontally compressed on an image plane to form an elliptical image, and elliptical light spots required by artistic creation are provided.
The advantages of the macro distortion wide screen lens provided by the invention are further described below with reference to specific embodiments.
Example 1
As shown in figure 2 which shows YZ and XZ views of the macro distortion wide screen lens provided in this embodiment,
The lens comprises a first lens group GFc0 with negative diopter, a cylindrical lens group G1 with diopter in the Y direction, a cylindrical lens group G2 with diopter in the X direction and a positive lens group G3 in sequence from the object side to the image plane side;
The first lens group GFc0 comprises a first negative diopter lens group GFc1, a second positive diopter lens group GFc2, a third negative diopter lens group GFc3, a fourth positive diopter lens group GFc4 and a fifth negative diopter lens group GFc5 from the object side to the image plane side in sequence;
The aperture S is arranged in the positive lens group G3;
When an object moves from infinity to a close distance, a first negative diopter lens group GFc1 and a fifth negative diopter lens group GFc5 in the first lens group GFc0 are fixed, an interval L1 between a second positive diopter lens group GFc2 and a third negative diopter lens group GFc3 is changed from large to small, and an interval L2 between a fourth positive diopter lens group GFc4 and a fifth negative diopter lens group GFc5 is changed from large to small to achieve a focusing function;
As shown in fig. 3, there are infinity, spherical aberration in the Y and X directions at a short distance, field curvature aberration, distortion aberration, and chromatic aberration of magnification in the present embodiment.
The data for example 1 are as follows:
rx (mm): radius of curvature of each face in the X direction;
Ry (mm): radius of curvature of each face in the Y direction;
D (mm): each lens spacing and lens thickness;
nd: refractive index of each glass of d-line;
Vd: abbe number of the glass;
focal distance: fx=39.73, fy=59.0;
Fno：2.9；
Half drawing angle: ωx=16.9°, ωy=7.64°;
| Object distance | inf | 0.5 Times |
| D(3) | 14.3412 | 25.2858 |
| D(5) | 14.9937 | 4.049 |
| D(8) | 2.204 | 16.5397 |
| D(11) | 16.4858 | 2.15 |
Example 2
As shown in figure 4 which is a YZ and XZ view of the macro distortion wide screen lens provided in this embodiment,
The lens comprises a first lens group GFc0 with negative diopter, a cylindrical lens group G1 with diopter in the Y direction, a cylindrical lens group G2 with diopter in the X direction and a positive lens group G3 in sequence from the object side to the image plane side;
The first lens group GFc0 comprises a first negative diopter lens group GFc1, a second positive diopter lens group GFc2, a third negative diopter lens group GFc3, a fourth positive diopter lens group GFc4 and a fifth negative diopter lens group GFc5 from the object side to the image plane side in sequence;
The aperture S is arranged in the positive lens group G3;
When an object moves from infinity to a close distance, a first negative diopter lens group GFc1 and a fifth negative diopter lens group GFc5 in the first lens group GFc0 are fixed, an interval L1 between a second positive diopter lens group GFc2 and a third negative diopter lens group GFc3 is changed from large to small, and an interval L2 between a fourth positive diopter lens group GFc4 and a fifth negative diopter lens group GFc5 is changed from large to small to achieve a focusing function;
as shown in fig. 5, there are infinity, spherical aberration in the Y and X directions at a short distance, field curvature aberration, distortion aberration, and chromatic aberration of magnification in the present embodiment.
The data for example 2 are as follows:
rx (mm): radius of curvature of each face in the X direction;
Ry (mm): radius of curvature of each face in the Y direction;
D (mm): each lens spacing and lens thickness;
nd: refractive index of each glass of d-line;
Vd: abbe number of the glass;
Focal distance: fx=33.16, fy=65.0;
Fno：2.9；
Half drawing angle: ωx=16.5°, ωy=7.09°;
the condition is satisfied:
| Conditional expression | Example 1 | Example 2 |
| (1):0.5≤Fy/Fc2≤1.2 | 0.986 | 0.729 |
| (2):0.5≤Fy/Fc4≤1.2 | 0.77 | 0.80 |
| (3):2.5≤Fy/(L1A-L1B)≤7 | 5.39 | 3.49 |
| (4):3≤Fy/(L2A-L2B)≤6 | 4.12 | 4.15 |
The micro-distance deformation wide screen lens provided by the invention has the advantages of high performance, small volume and low cost, the deformation ratio can reach more than 1.33 times, the micro-distance function of about 0.5 times is realized, the excellent micro-distance photographic performance is realized, and after scaling, the lens has elliptical light spots required by artistic creation.
The foregoing has outlined and described the basic principles, main features and features of the present invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, and that the above embodiments and descriptions are merely illustrative of the principles of the present invention, and various changes and modifications may be made therein without departing from the spirit and scope of the invention, which is defined by the appended claims. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (3)
1. The micro-distance deformed wide-screen lens is characterized by comprising a first lens group (GFc 0) with negative diopter, a cylindrical lens group (G1) with diopter in the Y direction, a cylindrical lens group (G2) with diopter in the X direction and a positive lens group (G3) in sequence from the object side to the image side;
The first lens group (GFc 0) comprises a first negative diopter lens group (GFc 1), a second positive diopter lens group (GFc 2), a third negative diopter lens group (GFc 3), a fourth positive diopter lens group (GFc 4) and a fifth negative diopter lens group (GFc 5) from the object side to the image side;
the aperture (S) is arranged in the positive lens group (G3);
when an object moves from infinity to a close distance, a first negative diopter lens group (GFc 1) and a fifth negative diopter lens group (GFc 5) in the first lens group (GFc 0) are fixed, a spacing L1 between the second positive diopter lens group (GFc 2) and the third negative diopter lens group (GFc 3) is reduced by a size, and a spacing L2 between the fourth positive diopter lens group (GFc 4) and the fifth negative diopter lens group (GFc 5) is reduced by a size to realize a focusing function;
The following conditional expression is also satisfied:
0.5 ≤ Fy/Fc2 ≤ 1.2 （1）
0.5 ≤ Fy/Fc4 ≤ 1.2 （2）
wherein, fy: an infinity state, a Y-direction focal length of the entire optical system;
fc2: a focal distance of the second positive refractive power lens group (GFc 2) in the first lens group (GFc 0);
fc4: a focal distance of a fourth positive refractive power lens group (GFc 4) in the first lens group (GFc 0);
The following conditional expression is also satisfied:
2.5 ≤ Fy/（L1A-L1B） ≤ 7 （3）
wherein, fy: an infinity state, a Y-direction focal length of the entire optical system;
L1A: in the infinity state, a separation distance between the second positive refractive power lens group (GFc 2) and the third negative refractive power lens group (GFc 3) in the first lens group (GFc 0);
L1B: in the closest shooting distance state, the distance between the second positive diopter lens group (GFc 2) and the third negative diopter lens group (GFc 3) in the first lens group (GFc 0);
The following conditional expression is also satisfied:
3 ≤ Fy/（L2A-L2B） ≤ 6 （4）
wherein, fy: an infinity state, a Y-direction focal length of the entire optical system;
L2A: in the infinity state, a distance between the fourth positive refractive power lens group (GFc 4) and the fifth negative refractive power lens group (GFc 5) in the first lens group (GFc 0);
L2B: in the closest shooting distance state, the distance between the fourth positive refractive power lens group (GFc 4) and the fifth negative refractive power lens group (GFc 5) in the first lens group (GFc 0) is set.
2. A digital camera having the macro distortion wide screen lens of claim 1.
3. A digital video camera having the macro distortion wide screen lens of claim 1.
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109856787A (en) * | 2018-12-28 | 2019-06-07 | 安徽长庚光学科技有限公司 | Zoom lens |
| CN112285889A (en) * | 2020-11-05 | 2021-01-29 | 安徽长庚光学科技有限公司 | Deformable wide-screen lens and digital camera with same |
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| JP5353267B2 (en) * | 2009-01-27 | 2013-11-27 | 株式会社リコー | Macro lens and camera |
| JP5565656B2 (en) * | 2009-09-16 | 2014-08-06 | 株式会社リコー | Imaging lens system and imaging apparatus |
| US8995064B2 (en) * | 2011-08-22 | 2015-03-31 | Nikon Corporation | Zoom lens, imaging apparatus, and method for manufacturing zoom lens |
| JP5867294B2 (en) * | 2012-05-30 | 2016-02-24 | 株式会社ニコン | PHOTOGRAPHIC LENS, OPTICAL DEVICE, AND MANUFACTURING METHOD |
| JP6251511B2 (en) * | 2013-08-09 | 2017-12-20 | 株式会社タムロン | Optical system and optical system focusing method |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109856787A (en) * | 2018-12-28 | 2019-06-07 | 安徽长庚光学科技有限公司 | Zoom lens |
| CN112285889A (en) * | 2020-11-05 | 2021-01-29 | 安徽长庚光学科技有限公司 | Deformable wide-screen lens and digital camera with same |
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