Planar array projection device and depth camera

Abstract

The invention discloses a planer array projection device and a depth camera. The planer array projection device comprises a planer array light source and a diffractive optical element, wherein the planer array light source comprises multiple light emitting elements for emitting laser; the diffractive optical element is used for carrying out beam expanding on the laser emitted by the planer array light source and converting the laser to patterned laser; the multiple light emitting elements are arranged into a first optical pattern; a pattern formed after a single beam of light is expanded through the diffractive optical element is a second optical pattern; the first optical pattern and the second optical pattern are composite to form a composite optical pattern, and the composite optical pattern is the patterned laser pattern; the first optical pattern, the second optical pattern and the composite optical pattern comprise multiple light beams; and the light beam layout in the composite optical pattern has local irrelevance, and the uniformity index is smaller than a preset threshold. Through the above mode, better optical projection effects can be achieved with a smaller light source, integration in a small device is realized, and the light weight and the thinness of the device are improved.

Description

technical field [0001] The invention relates to the field of optics, in particular to an area array projection device and a depth camera. Background technique [0002] Laser projection has been used in many occasions. For example, laser projection is used to generate structured light with a pattern and project it on an object, obtain the projected pattern on the object and obtain the depth information of the object accordingly. [0003] In the prior art, a depth camera can be composed of an infrared projector, an infrared camera and a processor. Among them, an infrared projector is generally composed of a light source, a lens, and a diffractive optical element, and is used to project an infrared image of a certain pattern to the target space, and the light source in the prior art is generally a single laser light source, which is large in size and difficult to Integrate into smaller projectors. Contents of the invention [0004] The invention provides an area array proj...

AI Technical Summary

Problems solved by technology

Among them, an infrared projector is generally composed of a light source, a lens, and a diffractive optical element, and is used to project an infrared image of a certain pattern to the target space, and the light source in the prior art is generally a single laser light source, which is large in size and difficult to Integrate into smaller projectors

Images