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Aspherical lens

A kind of aspherical surface and lens technology, applied in the field of lenses, can solve the problems of refractive index error and inability to eliminate aberration well, and achieve the effects of reducing difficulty, easy manufacturing, low cost, and reducing usage

Inactive Publication Date: 2009-02-18
HONG FU JIN PRECISION IND (SHENZHEN) CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there is a maximum value for oblique astigmatism, refractive index error and distortion at 0.3 field of view
[0041] Therefore, aspherical lenses are optimized with three or four fields of view, which cannot eliminate aberrations well.

Method used

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Embodiment Construction

[0057] Such as image 3 Shown is a schematic diagram of the aspheric lens structure of the present invention. The aspheric lens includes a first aspheric surface 1 and a second aspheric surface 2, and the radius of curvature of the first aspheric surface 1 is R 1 , The radius of curvature of the second aspheric surface 2 is R 2 , The thickness of the lens center is t, and the diameter of the lens is DA.

[0058] The aspheric lens of the present invention adopts the damping least square method to optimize the design. In the performance function (3), the process of correcting the aberration to the target value in the aspheric lens design of the present invention is expressed as having 10 variable design parameters, that is, 10 design variable performance functions. By χ 1 , Χ 2 , Χ 3 ,...Χ 9 , Χ 10 Represents the aspheric coefficient P of the first aspheric surface 1 1 , B 1 , C 1 , D 1 , E 1 And the aspheric coefficient P of the second aspheric surface 2 2 , B 2 , C 2 , D 2 , E 2 ,...

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Abstract

An aspherics includes a first / second aspheric surface. The variety of the refractive index is in 1D. Fixing the first aspheric surface, making the aspherics in 5 field of view at least, and making the target value of the performance function PHI=Sigma[wi(ei-ti]2 be zero; wherein, wi: power factor; m: optimizing term; ei: correction term considerable; and ti: target value of one astigmation.

Description

【Technical Field】 [0001] The invention relates to a lens, in particular to an aspheric lens. 【Background technique】 [0002] At present, the lenses used in optical equipment such as optical pickups, camera lenses, and spectacle lenses generally have spherical lenses or aspheric lenses. [0003] For spherical lenses, since the two refractive surfaces are both spherical, it is easier to manufacture and process. However, for a diverging spherical lens with a thin center and a thick edge, as the refractive index (also called power) of the lens increases, the edge of the lens will obviously thicken. The refractive index of the lens refers to the rear vertex power value of the lens, and its value is equal to the reciprocal of the paraxial rear vertex focal length (the distance from the vertex of the image side of the lens to the focal point of the image side) measured in meters. It can be calculated by formula (1): [0004] F v = ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02B13/18
Inventor 孙文信
Owner HONG FU JIN PRECISION IND (SHENZHEN) CO LTD
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