Structured light projection module without collimating lens and a 3D imaging device

Abstract

The invention discloses a structured light projection module without a collimating lens and a 3D imaging device having the same. The structured light projection module comprises a laser vcsel array light source and a diffractive optical element. The light-emitting surface of the laser vcsel array light source has light emitting points arranged regularly. The diffractive optical element has a microstructure distributed based on random phases and is used for copying a light beam emitted by the laser vcsel array light source and diffusing the light beam outwardly. According to the invention, thestructural compactness and the light energy utilization rate of the module can be increased effectively; usage of a DOE failure detecting device in the structured light projection module is avoided; and the safety problem of the structured light 3D imaging device in biological recognition application is solved in principle.

Description

technical field [0001] The invention relates to the field of optoelectronic technology, in particular to a structured light projection module without a collimating lens and a 3D imaging device with the structured light projection module. Background technique [0002] Different from traditional 2D imaging devices, such as cameras, which can only obtain plane 2D information of objects, 3D imaging devices can also obtain depth information of objects and build a three-dimensional 3D model, so 3D imaging devices are widely used in industrial measurement, parts Modeling, medical diagnosis, security monitoring, machine vision, biometrics, augmented reality AR, virtual reality VR and other fields have great application value. [0003] The 3D imaging device based on structured light technology is a new type of technical device with small size and high imaging precision, which has great potential for commercial application and has been applied to a certain extent in the field of consu...

AI Technical Summary

Problems solved by technology

[0004] The core part of the structured light 3D imaging device is the structured light projection module. The structured light projection module in the structured light 3D imaging device currently on the market needs a collimator lens to pre-adjust the projected light path, so it has a complex structure, optical Disadvantages of low energy utilization

At the same time, due to the use of the collimating lens, once the DOE of the projection module fails, the outgoing light of the laser light source will converge at the center. In biometric applications such as 3D face recognition, there will be a safety hazard of causing retinal burns to the user's eyes. question

Therefore, structured light projection modules using collimating lenses will add a DOE failure detection device inside the module, which further makes the structure of the module complex and bloated

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