A hot-pressing manufacturing method of a flexible variable-angle array diffractive optical device

Abstract

A method for manufacturing a flexible variable-angle array diffractive optical element through hot pressing includes the following steps: (1) making a single diffractive optical element mold; (2) making a flexible variable-angle array diffractive optical element mold; and (3) making a flexible variable-angle array diffractive optical element on a thermoplastic material: preparing and cleaning a thermoplastic flexible material; hot-pressing the flexible variable-angle array diffractive optical element mold using a hot press, and controlling the imprint depth by making use of the pressure and the hot pressing time, wherein the imprint depth is determined by the depth h of a binary diffractive optical structure; and after imprinting and cooling, removing and cutting the thermoplastic flexiblematerial, and bonding a first group of one-dimensional binary diffractive optical structures and an Nth group of one-dimensional binary diffractive optical structures together along the Y axis to form a flexible variable-angle array diffractive optical element. The flexible variable-angle array diffractive optical element has the advantages of good full-band speckle suppression effect, simple mode of motion, easy implementation, good system versatility and robustness, and low cost.

Description

technical field [0001] The invention belongs to the field of laser display projection, and in particular relates to a hot-pressing manufacturing method of a diffractive optical device structure used for laser speckle suppression on a flexible plastic material. Background technique [0002] Laser projection display system is getting more and more attention and welcome because of its rich colors, high picture quality, long life, high reliability, high efficiency, low energy consumption and other advantages. However, since laser light is highly coherent light, a picture noise called laser speckle will inevitably be generated. Speckle appears as black spots randomly distributed in the laser spot, and its essence is the random coherent superposition of signals. The existence of speckle seriously affects the quality of images and information. In the field of laser projection display, speckle will degrade the image quality of projection display, cause viewers to experience symptom...

AI Technical Summary

Problems solved by technology

[0006] In order to overcome the insufficient speckle suppression effect of the existing moving diffractive optical device technology, the inability to perform full-band speckle suppression, the number and types of devices used in the system, complex moving parts and impact damage to the instrument, large size, and complex instrument structure , high energy consumption and other shortcomings, and there is no universal manufacturing technology for making flexible diffractive optical devices for thermoplastic materials. Robust, low-cost flexible variable-angle array diffractive optical device hot-pressed manufacturing method, made of thermoplastic materials, through the variable-angle array diffractive structure, to build a crawler transmission that can circulate infinitely at a constant speed instead of reciprocating mechanical movement Red, green, blue full-band laser speckle suppression

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