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Optical imaging system

An optical imaging system, optical axis technology, applied in optics, optical components, instruments, etc., can solve the problems of small aperture, small image area, unclear imaging, etc., to achieve correction of astigmatism and distortion, balance aberration, high imaging quality effect

Pending Publication Date: 2021-11-02
ZHEJIANG SUNNY OPTICAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there are still many problems with fisheye lenses. For example, the common fisheye lens has a small aperture, which will cause insufficient light intake and unclear imaging. In addition, it is difficult to correct aberrations, and the image surface is generally small.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

specific Embodiment 1

[0097] figure 1 It is a schematic diagram of the lens group structure of Embodiment 1 of the optical imaging system of the present invention. The optical imaging system includes in sequence from the object side to the image side along the optical axis: a first lens E1, a second lens E2, a third lens E3, an aperture STO, The fourth lens E4, the fifth lens E5, the sixth lens E6, the seventh lens E7, the eighth lens E8, the filter E9 and the imaging surface S19.

[0098] The first lens E1 has negative refractive power, its object side S1 is convex, and its image side S2 is concave. The second lens E2 has negative refractive power, its object side S3 is concave, and its image side S4 is concave. The third lens E3 has positive refractive power, its object side S5 is convex, and its image side S6 is concave. The fourth lens E4 has positive refractive power, its object side S7 is concave, and its image side S8 is convex. The fifth lens E5 has positive refractive power, its object ...

Embodiment 1

[0106] The optical imaging system in embodiment 1 satisfies:

[0107] f / EPD=1.10; wherein, f is the effective focal length of the optical imaging system, and EPD is the entrance pupil diameter of the optical imaging system.

[0108] f3 / f=3.29; wherein, f is the effective focal length of the optical imaging system, and f3 is the effective focal length of the third lens.

[0109] (R15+R16) / f8=1.22; wherein, R15 is the radius of curvature of the object side of the eighth lens, R16 is the radius of curvature of the image side of the eighth lens, and f8 is the effective focal length of the eighth lens.

[0110] |f7 / R11|=2.62; wherein, f7 is the effective focal length of the seventh lens, and R11 is the radius of curvature of the object side of the sixth lens.

[0111] |f1 / f|=5.86; wherein, f is the effective focal length of the optical imaging system, and f1 is the effective focal length of the first lens.

[0112] |f1 / f2|+|f7 / f8|=4.14; where, f1 is the effective focal length of ...

specific Embodiment 2

[0125] image 3 It is a schematic diagram of the lens group structure of Embodiment 2 of the optical imaging system of the present invention. The optical imaging system includes in sequence from the object side to the image side along the optical axis: a first lens E1, a second lens E2, a third lens E3, a diaphragm STO, The fourth lens E4, the fifth lens E5, the sixth lens E6, the seventh lens E7, the eighth lens E8, the filter E9 and the imaging surface S19.

[0126] The first lens E1 has negative refractive power, its object side S1 is convex, and its image side S2 is concave. The second lens E2 has negative refractive power, its object side S3 is concave, and its image side S4 is concave. The third lens E3 has positive refractive power, its object side S5 is convex, and its image side S6 is concave. The fourth lens E4 has positive refractive power, its object side S7 is concave, and its image side S8 is convex. The fifth lens E5 has positive refractive power, its object ...

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Abstract

The invention discloses an optical imaging system, which sequentially comprises a first lens with negative focal power, a second lens with negative focal power, a third lens, a fourth lens with the image side surface as a convex surface, a fifth lens element, a sixth lens, a seventh lens, and an eighth lens along an optical axis from an object side to an image side, an air gap is formed between every two adjacent lenses; the maximum half field angle Semi-FOV of the optical imaging system is larger than 95 degrees, and the Semi-FOV is controlled to be larger than 95 degrees, so that receiving of information in a larger field range of an object space is facilitated; in addition, an air gap is formed between adjacent lenses, so that the assembly of the lenses can be ensured.

Description

technical field [0001] The invention belongs to the field of optical imaging, in particular to an optical imaging system including eight lenses. Background technique [0002] With the rapid development of drones, security, automobiles, meteorology, medical care and other fields, higher and higher requirements are placed on the field of view of the imaging lens mounted on them. The fisheye lens compresses the light at the edge of the field of view as much as possible by introducing barrel distortion, thereby realizing an ultra-wide-angle lens with a field of view approaching or exceeding 180°. At present, there are still many problems with fisheye lenses. For example, the small aperture of common fisheye lenses will cause insufficient light intake and unclear imaging. In addition, it is difficult to correct aberrations, and the image surface is generally small. [0003] In order to solve the above problems, the object of the present invention is to design an 8-piece optical ...

Claims

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Application Information

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IPC IPC(8): G02B13/00G02B13/06G02B13/18
Inventor 戴付建龚停停宋立通赵烈烽
Owner ZHEJIANG SUNNY OPTICAL CO LTD
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