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Wide-angle lens

A wide-angle lens and lens technology, applied in the field of camera lenses, can solve the problems of unusable, distortion, and large structure size and cannot be applied to head-mounted VR, etc., and achieve the effects of eliminating aberration, reducing focus movement, and improving optical performance.

Active Publication Date: 2016-11-16
郑州联创电子有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For example, in Patent No. CN201310528701.8, although the field of view range of the wide-angle lens is [130°~220°], and the problem of serious distortion after the field of view exceeds 90° is solved, the total optical length of the entire lens L= 17.02mm, which is not conducive to the miniaturization of the entire lens
In addition, the wide-angle lens in the prior art cannot be applied to a head-mounted VR (Virtual Reality, VR for short) device due to its large structural size, and cannot be used in a dark environment

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0058] see Figure 1a to Figure 1e , is a kind of wide-angle lens provided in the first embodiment of the present invention. From the object side to the imaging surface, it includes a meniscus-shaped first lens L1 with negative refractive power and a concave surface facing the imaging surface, and a second lens with negative refractive power. Lens L2, the third lens L3 with positive refractive power, the fourth lens L4 with positive refractive power and convex surfaces on both sides, and the fifth lens L5 with negative refractive power and concave surfaces on both sides, with positive refractive power And the sixth lens L6 whose both sides are convex, the diaphragm S7 arranged between the third lens L3 and the fourth lens L4, and the filter arranged between the sixth lens L6 and the imaging surface In the light sheet G1, each lens is a plastic aspheric lens.

[0059] In this embodiment, the curvature radius of the S2 surface of the first lens L1<the curvature radius of the S3...

Embodiment 2

[0069] see Figure 2a to Figure 2e , is a wide-angle lens provided in the second embodiment of the present invention. The structure of the wide-angle lens in this embodiment is roughly the same as that of the wide-angle lens in the first embodiment. The difference is that the second lens near the object side One side is convex and the side near the imaging surface is concave, and the side of the third lens near the object side is concave and the side near the imaging surface is convex.

[0070] In this embodiment, the curvature radius of the S4 surface of the second lens<the curvature radius of the S2 surface of the first lens<the curvature radius of the S6 surface of the third lens<the curvature radius of the S1 surface of the first lens Radius of curvature<radius of curvature of surface S5 of the third lens<radius of curvature of surface S3 of the second lens.

[0071] In this embodiment, relevant parameters of each lens are shown in Table 2-1.

[0072] table 2-1

[0073]...

Embodiment 3

[0080] see Figure 3a to Figure 3e , is a kind of wide-angle lens provided by the third embodiment of the present invention. The structure of the wide-angle lens in this embodiment is roughly the same as that of the wide-angle lens in the first embodiment. The difference is that the third lens is close to the object side One side is concave and the side closer to the imaging plane is convex.

[0081] In this embodiment, the curvature radius of the S2 surface of the first lens<the curvature radius of the S4 surface of the second lens<the curvature radius of the S3 surface of the second lens<the curvature radius of the S6 surface of the third lens Radius of curvature<radius of curvature of surface S5 of the third lens<radius of curvature of surface S1 of the first lens.

[0082] In this embodiment, relevant parameters of each lens are shown in Table 3-1.

[0083] Table 3-1

[0084] Surface serial number

surface type

radius of curvature

thickness

Refra...

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Abstract

The invention provides a wide-angle lens, which comprises, from an object side to an imaging plane in sequence, a meniscus-type first lens, which has negative focal power and the concave surface of which faces to the imaging plane; a second lens, which has negative focal power; a third lens has positive focal power; a fourth lens, which has positive focal power, and the double surfaces of which are convex surfaces respectively; a fifth lens, which has negative focal power and the double surfaces of which are concave surfaces respectively; a sixth lens, which has positive focal power and the double surfaces of which are convex surfaces respectively; a diaphragm, which is arranged between the third lens and the fourth lens; and an optical filter, which is arranged between the sixth lens and the imaging plane, wherein each lens is a plastic aspheric lens. Since each lens is the plastic aspheric lens, the wide-angle lens is allowed to have better optical performance; and meanwhile, structure composition between the lenses can help realize miniaturization of the wide-angle lens.

Description

technical field [0001] The invention relates to the field of camera lens technology, in particular to a wide-angle lens. Background technique [0002] A wide-angle lens, also known as a short focal length lens, is a lens with a shorter focal length than a standard lens and a larger field of view. Its main goal is to require the angle of view to be as high as possible, and at the same time, it is hoped that the image can be as undistorted as possible, especially that the distortion of the image can be as small as possible. [0003] In the prior art, a wide-angle lens includes a front lens group with negative refractive power, a diaphragm, and a rear lens group with positive refractive power in order from the object side to the image side. For example, in Patent No. CN201310528701.8, although the field of view range of the wide-angle lens is [130°~220°], and the problem of severe distortion after the field of view exceeds 90° is solved, the total optical length of the entire ...

Claims

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Application Information

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IPC IPC(8): G02B13/00G02B13/06G02B13/18
CPCG02B13/0045G02B13/06G02B13/18
Inventor 陈伟建刘绪明曾吉勇
Owner 郑州联创电子有限公司
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