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The Processing Method of Improving the Center Deviation Precision of Aspheric Lens

An aspherical lens, aspherical technology, applied in the direction of lenses, metal processing equipment, manufacturing tools, etc., can solve problems such as damage to center deviation, inaccurate positioning, center deviation correction, etc.

Inactive Publication Date: 2011-12-07
LUOYANG INST OF ELECTRO OPTICAL EQUIP OF AVIC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the inability to accurately position the plate, the center deviation of the lens will be changed when the surface shape of the spherical surface is corrected by polishing, which will destroy the center deviation guaranteed by the precise positioning of the previous diamond turning process, resulting in a large center deviation of the lens.
Moreover, since the outer circle size of the lens is ground to a complete state after the spherical surface and the aspherical surface are best-fit spherical surface milling and grinding, the center deviation cannot be corrected after the polishing process is completed. The existing aspheric surface There are big defects in the lens processing method, and the aspheric lens produced by this method seriously affects the imaging quality of the optical system

Method used

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  • The Processing Method of Improving the Center Deviation Precision of Aspheric Lens

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Embodiment 1

[0029] Embodiment 1: The present embodiment 1 takes processing germanium aspheric lens---imaging lens as example: the technological requirement of this imaging lens is

[0030] The outer circle size of the blank is φ25, and the finished outer circle size of the lens is φ24 ;

[0031] Radius of spherical curvature R-10.447, platform size φ16, surface accuracy N=3, ΔN=0.3;

[0032] Aspheric equation

[0033]

[0034] Among them, c=1 / 14.028, h 2 = x 2 + y 2 , K=0, A=-1.0515E-06, B=-1.313E-8, ​​C=1.0551E-10,

[0035] D=-9.0347E-13, E=0, F=0, G=0, H=-0, J=0,

[0036] Surface accuracy Rt≤0.4μm, Ra≤0.04μm;

[0037] Center deviation χ≤1.2';

[0038] Center thickness dimension 5±0.02;

[0039] Surface blemish grade B=Ⅴ.

[0040] The processing method of the imaging lens is as follows:

[0041] (1) Calculate the radius of the best fitting sphere of the aspheric surface, and the radius of the best fitting sphere of the aspher...

Embodiment 2

[0051] Embodiment 2: This embodiment 2 takes the processing of germanium aspheric lens—narrow field of view eyepiece as an example:

[0052] The process requirements of the narrow field of view eyepiece are: the outer circle size of the blank is φ25.5; the finished outer circle size of the lens is φ23.5 ; Spherical curvature radius R-237.7, platform size φ21, surface shape accuracy N=3, ΔN=0.3;

[0053] Aspheric equation

[0054]

[0055] Where: c=1 / -105.3971, h 2 = x 2 + y 2 , K=70.913844, A=0.108734E-04, B=0.453598E-08,

[0056] C=0.771109E-10, D=0.191692E-11, E=-0.118487E-18, F=0, G=0, H=0, J=0,

[0057] Surface accuracy Rt≤0.4μm, Ra≤0.04μm;

[0058] Center deviation χ≤0.3′; center thickness dimension 3.4±0.03; surface defect grade B=Ⅴ.

[0059] The processing method of the narrow field eyepiece is as follows:

[0060] (1) Calculate the best fitting spherical radius of the aspheric surface, and the best fitting spherical radius of ...

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Abstract

The invention discloses a processing method for improving a central deviation precision of a non-spherical lens. When processing is carried out, an excircle of a lens is not directly ground to a completed size and a certain allowance is left; after processing by a spherical surface of a point diamond turning and an optimum fitting spherical surface, surface shape of a spherical surface is refined, so that a surface shape precision of the spherical surface is improved. When the surface shape of the spherical surface is being refined, a point diamond turning mode is changed, so that a central deviation is ensured. After the refinement, a reflective centering edging operation is added to correct the central deviation. Firstly, it is ensured that an optical axis of the spherical surface is superposed with a symmetric axis of the excircle of the lens and a platform is perpendicular to the optical axis; and secondly, positioning is carried out according to the processed excircle and the platform and a non-spherical surface shape that satisfies a precision requirement is made by utilizing the changed point diamond turning mode, so that a non-spherical optical axis is consistent with symmetric axis of the excircle of the lens. Because the reflective centering operation is reasonably arranged, an eccentric error caused during refinement and polishing of the surface shape of the spherical surface is improved and thus a central deviation precision of the non-spherical lens is enhanced.

Description

technical field [0001] The invention belongs to the technical field of optical manufacturing, and mainly relates to a processing method for improving the center deviation precision of an aspheric lens. Background technique [0002] The center deviation of the optical lens, especially the center deviation of the aspheric lens seriously affects the imaging quality of the optical system, and it needs to be strictly controlled during processing. Due to the improvement of the system's overall index requirements and the limitation of the structure, more and more infrared thermal imaging cameras use germanium aspheric lenses in the optical system. In order to improve the imaging quality of the optical system, it is necessary to strictly control the center deviation of the germanium aspheric lens. [0003] The aspherical lens involved in the present invention is such as figure 1 As shown, the lens is a convex lens structure. One side of the lens is a spherical surface 1 with a rad...

Claims

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Application Information

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IPC IPC(8): G02B3/02B24B13/00
Inventor 孙红晓杨凯袁兆峰刘彦清
Owner LUOYANG INST OF ELECTRO OPTICAL EQUIP OF AVIC
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