Optical projection module and control method thereof

Abstract

The invention discloses an optical projection module and a control method thereof. The optical projection module comprises a laser emission device, a collimating lens, a diffraction apparatus and an optical sensing device, wherein the collimating lens is arranged above the laser emission device; the diffraction apparatus is arranged above the collimating lens; and the optical sensing device is arranged on a side face of the diffraction apparatus and is used for sensing light rays emitting towards side periphery by the diffraction apparatus. The control method comprises the following steps: turning on the laser emission device; sensing light rays emitted from the diffraction apparatus by utilizing the optical sensing device, and generating different electric induction signals according to intensity of the light rays; judging whether operation of the diffraction apparatus is normal according to changes of the electric induction signals transmitted by the optical sensing device, and controlling the laser emission device to be turned off when the operation of the diffraction apparatus is judged to be abnormal. According to the optical projection module and the control method thereof, different electric induction signals are transmitted by sensing the light rays at the side periphery of the diffraction apparatus by the optical sensing device, whether the operation of the diffractionapparatus is normal is judged, the laser emission device is turned off when the operation is abnormal, and the condition that human eyes are damaged due to strong light emitting from the diffractionapparatus is avoided.

Description

technical field [0001] The invention relates to the technical field of electronic products, in particular to an optical projection module and a control method thereof. Background technique [0002] At present, structured light technology has gradually developed into a relatively mature stereoscopic imaging technology, which can be applied to face recognition, human-computer interaction, three-dimensional space scanning and other fields. The basic working principle of structured light technology is that the projection of optical projection modules has a certain Structured light patterns, such as scattered random scattering spots, project these random scattering spots on the surface of the object, and then collect the scattering spots projected on the surface of the object through the image acquisition device, and then calculate the depth of the object Information, realize face recognition, human-computer interaction, three-dimensional space scanning and other functions. [0...

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Problems solved by technology

[0003] The structured light pattern projected by the optical projection module is generally obtained by receiving the laser light emitted by a laser (such as VCSEL) through a collimator lens, converging it to form a parallel beam and projecting it outward, and then through a diffractive optical device (DOE). The parallel beam projected by the col

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