Laser emission module and 3D imaging device

Abstract

The invention provides a laser emission module and a 3D imaging device, and relates to the technical field of optical devices. A light source assembly can emit light beams. The emitted light beams arecollimated by a collimating mirror and then parallel light beams are emitted; the parallel light beams pass through a diffractive optical element, and then the light beams are copied and spliced to form multiple beams of parallel light; a plurality of beams of parallel light are emitted to a zoom-out lens and shrunk at a preset multiplying power and then projected into a target space to generatea speckle pattern and thus the purpose of reducing the field angle of the laser emission module is achieved, and the density of the speckle points in a unit area is improved; meanwhile, the diameter of the speckle points can be reduced through the reducing lens, and the purpose of improving the energy density of the speckle points is achieved. Therefore, the texture of the target space is clearer,the contrast ratio is higher, more accurate depth measurement information can be conveniently obtained by the laser emission module during long-distance application, and a foundation is laid for wideapplication of the laser emission module.

Description

technical field [0001] The invention relates to the technical field of optical devices, in particular to a laser emitting module and a 3D imaging device. Background technique [0002] 2D imaging devices can obtain 2D plane information of objects, but due to the rapid improvement of people's living standards, traditional 2D imaging devices have gradually been unable to meet people's daily needs. With the in-depth research of science and technology, 3D imaging devices can further obtain the depth information of objects on the basis of 2D imaging, thereby constructing a three-dimensional 3D model, which is widely used in industrial measurement, biometrics, AR, VR and other fields. [0003] In the 3D imaging device, the core component is the laser emitting module, which is mainly used to project the speckle pattern into the target space, and obtain the speckle pattern in the target space through the receiving camera to measure the depth information. However, in practical appli...

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Problems solved by technology

[0004] The purpose of the present invention is to provide a laser emitting module and a 3D imaging device to solve the problem that the existing 3D imaging device is difficult to obtain accurate depth measurement information during long-distance projection.

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