Diffraction optical component and its production

Abstract

An optical diffraction element consists of a lens and a diffraction grating being stuck on said lens. Its preparing method including providing a lens with the first surface and a diffraction grating with the second surface and diffraction surface in opposite to the second surface, setting diffraction structure on said diffraction surface and sticking the first surface of lens on the second surface of diffraction grating to let diffraction surface with diffraction be set towards outside.

Description

【Technical field】 [0001] The invention relates to an optical element and a manufacturing method thereof, in particular to a diffractive optical element and a manufacturing method thereof. 【Background technique】 [0002] With the development of multimedia technology, digital products such as DVDs, digital cameras, digital projectors, video cameras, scanners, and fax machines are becoming more and more popular among consumers. The image quality of the object also puts forward higher requirements, that is, it is hoped that the image of the object to be shot is clear, and the image quality of the object depends to a large extent on the quality of each optical component in the digital product. [0003] Diffractive optical lenses can avoid the customary chromatic aberration problem of ordinary lenses, thereby greatly improving the imaging quality of the lens and making the picture effect of digital products better. At present, the more commonly used method is to use injection mol...

AI Technical Summary

Problems solved by technology

The disadvantage of this injection molding method is that the shrinkage of the plastic material itself makes the diffraction structure of the obtained lens deviate greatly from that of the mold, so the quality of the diffractive optical lens is difficult to guarantee

Another existing method for making a diffractive optical lens is to first coat a photoresist on a substrate, then set the required diffraction structure stripes on the photoresist, and then develop and fix the diffraction stripes. It is formed on the photoresist, then the diffraction stripes are etched on the substrate, and finally the photoresist is removed to make the diffractive optical element. This method is complicated and difficult to realize the automation of production, so it cannot be mass-produced

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