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Deformable wide-screen lens and digital camera with same

A digital camera and wide-screen technology, applied in optical components, optics, instruments, etc., can solve the problems of lower image quality, difficulty in large-magnification deformation, poor close-up performance, etc., and achieve low cost, good close-up capability, and small size small effect

Pending Publication Date: 2021-01-29
ANHUI CHANGGENG OPTICS TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] In recent years, with the advancement of high-quality cameras, digital camera systems have gradually become popular. The screens are mostly in 4:3 and 16:9 formats, but most theater screens are 2.35:1 and 2.6:1, or even larger. For this reason, when playing, it needs to be cut up and down to achieve such an aspect ratio to meet the visual habits of the human eye. In this way, many effective pixels will be lost and the image quality will be reduced by cutting up and down. Therefore, the market is demanding high-performance, Anamorphic lenses with high compression ratios are increasingly in demand
[0003] Currently known anamorphic wide-screen lens, as described in Japanese Patent Application Laid-Open No. 8-184759, the cylindrical lens group with a deformation ratio of 1.33 is located between the 4th group G4 and the 5th group, and is also located in the diaphragm. Between the image plane and the image plane, although it is easy to achieve miniaturization, the space is limited, and it is difficult to achieve large-magnification deformation. At the same time, because of the deformation, the diameters of the beams on the axis in the X and Y directions are different, which will lead to the X and Y directions of the aperture Fno Not the same, the out-of-focus spot is elliptical when shooting at the same time, but when it is actually projected, after scaling, it returns to a circular spot, and the artistic creation needs of the elliptical spot produced by the anamorphic lens cannot be obtained.
[0004] As described in Japanese Patent Application Laid-Open No. 2005-221597, Embodiment 1 also places a cylindrical lens group with a deformation ratio of 1.33 times between the diaphragm and the image plane. The artistic creation requirements of the elliptical spot, although the embodiment 2 puts the deformed cylindrical mirror at the front, but because of the characteristics of the cylindrical mirror, the focal length in the horizontal X direction and the vertical Y direction are different, when it is placed at the front , although infinity can achieve the same position of the imaging point and get a good imaging effect, but when the object moves to a certain close distance, because the focal lengths in the X and Y directions are different, the position of the image point will inevitably be different. Once the depth of field is exceeded range, it is easy to cause the performance of X and Y to drop sharply due to inconsistent image point positions, so the close-up performance of this structure will be poor

Method used

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  • Deformable wide-screen lens and digital camera with same
  • Deformable wide-screen lens and digital camera with same
  • Deformable wide-screen lens and digital camera with same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] Such as figure 1 The YZ and XZ views shown, from the object side to the image plane side, include the first lens group G1 with negative diopter, the second lens group cylindrical lens group G2 with positive diopter in the Y direction, and the third lens group with diopter in the X direction. The lens group cylindrical lens group G3 and the fourth positive lens group G4 with positive diopter; when the object moves from infinity to close distance, the negative diopter lens of the first lens group G1 closest to the image plane side moves, Realize the focusing function; the aperture S is set in the fourth positive lens group G4.

[0047] Such as figure 2 The spherical aberration, field curvature aberration, distortion aberration and chromatic aberration of magnification in the Y direction and X direction at infinity and short distance (object distance = 1500) of the shown embodiment 1.

[0048] [The data of Example 1 are as follows]

[0049] Rx (mm): the radius of curva...

Embodiment 2

[0061] Such as image 3 The YZ and XZ views shown, from the object side to the image plane side, include the first lens group G1 with negative diopter, the second lens group cylindrical lens group G2 with positive diopter in the Y direction, and the third lens group with diopter in the X direction. The lens group cylindrical lens group G3 and the fourth positive lens group G4 with positive diopter; when the object moves from infinity to close distance, the negative diopter lens of the first lens group G1 closest to the image plane side moves, Realize the focusing function; the aperture S is set in the fourth positive lens group G4.

[0062] Such as Figure 4 The spherical aberration, field curvature aberration, distortion aberration and chromatic aberration of magnification in the Y direction and X direction at infinity and short distance (object distance = 1500) of the shown embodiment 2.

[0063] [The data of embodiment 2 are as follows]

[0064] Rx (mm): the radius of cu...

Embodiment 3

[0076] Such as Figure 5 The YZ and XZ views shown, from the object side to the image plane side, include the first lens group G1 with negative diopter, the second lens group cylindrical lens group G2 with positive diopter in the Y direction, and the third lens group with diopter in the X direction. The lens group cylindrical lens group G3 and the fourth positive lens group G4 with positive diopter; when the object moves from infinity to close distance, the negative diopter lens of the first lens group G1 closest to the image plane side moves, Realize the focusing function; the aperture S is set in the fourth positive lens group G4.

[0077] Such as Figure 6 The spherical aberration, field curvature aberration, distortion aberration and chromatic aberration of magnification in the Y direction and X direction at infinity and short distance (object distance = 1500) of the shown embodiment 3.

[0078] [The data of embodiment 3 are as follows]

[0079] Rx (mm): the radius of c...

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Abstract

The invention belongs to the technical field of optical devices, and particularly relates to a deformable wide-screen lens which sequentially comprises a first lens group with negative diopter, a second lens group cylindrical lens group with positive diopter in the Y direction, a third lens group cylindrical lens group with diopter in the X direction and a fourth positive lens group with positivediopter from the object side to the image surface side. When an object moves from infinity to a close distance, the negative diopter lens, closest to the image plane side, of the first lens group moves to realize a focusing function. The aperture is arranged in the fourth positive lens group so as to meet the following conditional expressions: 0.3<=Fy / Fzy<=0.8, 3<=Abs(Fzx / Fzy), and 1.05<=DA / DY<=1.5; the deformable wide-screen lens provided by the invention has the advantages of high performance, small size and low cost, the deformation ratio of the deformable wide-screen lens is 1.5 times or more, and the deformable wide-screen lens has good close-up capability and has elliptical light spots required by artistic creation after zooming.

Description

technical field [0001] The invention belongs to the technical field of optical devices, and in particular relates to an anamorphic wide-screen lens and a digital camera equipped with it. Background technique [0002] In recent years, with the advancement of high-quality cameras, digital camera systems have gradually become popular. The screens are mostly in 4:3 and 16:9 formats, but most theater screens are 2.35:1 and 2.6:1, or even larger. For this reason, when playing, it needs to be cut up and down to achieve such an aspect ratio to meet the visual habits of the human eye. In this way, many effective pixels will be lost and the image quality will be reduced by cutting up and down. Therefore, the market is demanding high-performance, Anamorphic lenses with high compression ratios are in increasing demand. [0003] Currently known anamorphic wide-screen lens, as described in Japanese Patent Application Laid-Open No. 8-184759, the cylindrical lens group with a deformation r...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B13/00G02B13/08
CPCG02B13/00G02B13/08
Inventor 李大勇
Owner ANHUI CHANGGENG OPTICS TECH CO LTD