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Method of making optical low-pass filter

A manufacturing method and filter technology, applied in the direction of filters, etc., can solve the problems of increased thickness, high cost of crystal raw materials, and limited miniaturization of optical systems, and achieve the effect of improving yield and eliminating installation errors.

Inactive Publication Date: 2016-05-18
曹敬伟
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0002] At present, optical low-pass filters using birefringence of crystals have high raw material costs. In particular, color video cameras using solid-state imaging elements require multiple crystals and increase in thickness, which limits the miniaturization of the optical system.

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  • Method of making optical low-pass filter

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Embodiment Construction

[0009] The present invention will be further explained below in conjunction with the accompanying drawings.

[0010] A method for manufacturing an optical low-pass filter, characterized in that: the regions with different refractive indices change periodically in shape in the same continuous region; a plurality of regions with the different refractive indices are formed discontinuously, and these formed A plurality of regions are arranged in two-dimensional or three-dimensional periodicity; the regions with the different refractive indices, in the same continuous region, the shape changes periodically, and according to the periodic shape change, the optical component for the phase-type optical low-pass filter In the high spatial frequency region above the cutoff frequency, the MTF value is about 0.5.

[0011] The above content is only a preferred embodiment of the present invention, and is not intended to limit the implementation of the present invention. Appropriate modificat...

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Abstract

The invention discloses a method of making an optical low-pass filter. According to areas with different refractive indexes, the shape in the same continuous area changes periodically; multiple areas with different refractive indexes are formed discontinuously, and the formed multiple areas are arranged in a two-dimensional or three-dimensional period mode; according to the areas with different refractive indexes, in the samecontinuous area, the shape changes periodically, according to the periodical change of the shape, an optical part for the phase-type optical low-pass filter is in a high-spatial frequency area above cut-off frequency, and the MTF value is 0.5. Through radiating on a transparent material or converging and radiating on a pulse laser, the inner part forms areas with different refractive indexes, the problem of mounting errors can be eliminated, and the yield of the product can be improved.

Description

technical field [0001] The invention relates to the technical field of optical components, in particular to a method for manufacturing an optical low-pass filter. Background technique [0002] At present, optical low-pass filters using crystal birefringence have high raw material costs for crystals. In particular, in color video cameras using solid-state imaging elements, multi-chip crystals are required and the thickness increases, which limits the miniaturization of the optical system. Contents of the invention [0003] In view of the above problems, the technical problem to be solved by the present invention is to provide a method for manufacturing an optical low-pass filter. [0004] A method for manufacturing an optical low-pass filter, characterized in that: the regions with different refractive indices change periodically in shape in the same continuous region; a plurality of regions with the different refractive indices are formed discontinuously, and these formed ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B5/20
Inventor 曹敬伟
Owner 曹敬伟