Direct type optical projection system and optical projection method

Abstract

The invention discloses a direct type optical projection system comprising a light source module configured to emit a collimated beam; a fly-eye lens configured to allow the collimated beam to enter from one surface of the fly-eye lens and exit from the second surface of the fly-eye lens, and to allow the collimated beam to be converged on the focal plane of the fly-eye lens to form lattice lighton the focal plane; and a telecentric projection lens group for allowing light emitted from the fly-eye lens to penetrate through the telecentric projection lens group, and allowing the light emittedfrom the telecentric projection lens group to form speckles or area arrays on an imaging plane. In addition, the invention also discloses an optical protection method comprising the following steps ofemitting the collimated beam; allowing the collimated beam to enter from the first surface of the fly-eye lens and exit from the second surface of the fly-eye lens, and to be converted on the focal plane of the fly-eye lens to form the lattice light on the focal plane; and allowing the light emitted from the fly-eye lens to enter and penetrate through the telecentric projection lens group, thus allowing the light emitted from the telecentric projection lens group to form the speckles or area arrays on the imaging plane.

Description

Technical field [0001] The invention relates to an optical device and a method of use, in particular to an optical projection system and an optical projection method. Background technique [0002] As a brand-new technology, 3D depth vision has appeared in consumer products such as mobile phones, somatosensory games, and payment, and has gradually penetrated into new fields such as security and autonomous driving. With the continuous advancement of hardware technology and the continuous optimization of algorithms and software levels, the accuracy and practicality of 3D depth vision have been greatly improved. [0003] In the prior art, 3D depth vision mainly uses binocular stereo vision, 3D structured light and TOF. Among them, binocular stereo vision generally uses dual cameras to obtain two digital images of the measured object at the same time from different angles, and restores the three-dimensional geometric information of the object based on the principle of parallax, and rec...

AI Technical Summary

Problems solved by technology

VCSEL has a large thermal resistance. When driven by high power, the main wavelength drifts greatly with temperature changes. At the same time, the optical design of DOE is closely related to the wavelength. Therefore, the large drift of the wavelength will easily lead to matching problems and affect the stability of the projected spot.

[0007] (2) The projection system of VCSEL+DOE cannot meet the demand for higher detection accuracy for the number of lattices

Due to the collimation of VCSEL and the limitation of DOE's component process precision, only tens of thousands of points can be projected at present, which cannot meet the demand for higher detection accuracy and the number of lattices

[0008] (3) The projection system of VCSEL+DOE is prone to photobiological safety problems

In practical applications, when the DOE surface is damp, the texture may be filled with water vapor and fail, causing the laser to escape directly, which will burn the human eye

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