Area array laser projector and depth camera thereof

Abstract

The present invention discloses an area array laser projector and a depth camera thereof. The area array laser projector comprises a substrate, at least two light-emitting elements, a controller and a diffractive optical element. The diffractive optical element is disposed at a position spaced at a first distance from the substrate. The at least two light-emitting elements are fixed at one side of the substrate that is facing the diffractive optical element. The at least two light-emitting elements are controlled by the controller to emit the laser. The emitted laser has at least two different wavelengths. The diffractive optical element is used for expanding the beam of the laser emitted by the at least two light-emitting elements, and then emitting laser patterns into the space. The area array laser projector is provided with the at least two light-emitting elements, so that the laser having at least two different wavelengths can be emitted. Therefore, the formation of noise patterns in the laser patterns can be effectively reduced. As a result, the accuracy of a depth image acquired by the depth camera is improved.

Description

technical field [0001] The invention relates to the field of optics, in particular to an area array laser projector and a depth camera thereof. Background technique [0002] Laser projectors are used to emit set optical patterns to the target space, and are widely used in the field of optical-based three-dimensional measurement. A laser projector generally consists of a light source, a collimating mirror, and a diffractive optical element. The light source can be a single edge-emitting laser light source or an area array laser light source composed of multiple vertical cavity surface-emitting lasers. [0003] Compared with a laser projector based on a single edge-emitting laser source, an area array laser projector based on at least two vertical cavity surface-emitting laser sources can emit a laser pattern with the same power and higher uniformity in a smaller volume. [0004] However, whether it is a laser projector based on a single edge-emitting laser source or an area ...

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Problems solved by technology

[0004] However, whether it is a laser projector based on a single edge-emitting laser source or an area array laser projector based on at least two vertical cavity surface-emitting laser sources, due to the high coherence of the laser source, the laser light generated by projecting the laser light onto the target object In addition to the active pattern formed by the light source beam in the pattern, other noise patterns will also be generated, and the noise pattern will directly affect the quality of the laser pattern and the accuracy of the depth image acquired by the depth camera

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