Lens and structured light projection module

Abstract

The invention provides a lens and a structured light projection module, and relates to the technical field of optical devices. The lens comprises a first convergent lens, a second convergent lens, a third convergent lens and a fourth convergent lens which are sequentially arranged along a light emitting direction, wherein the first convergent lens, the second convergent lens, the third convergentlens and the fourth convergent lens are all aspheric lenses. Under the action of the converging lens, the divergent light beams are finally intersected on the main optical axis to form a certain included angle to be projected into a target area in the form of parallel light beams, so that a light spot group is formed, and the depth information of an object in the target area is measured. When depth information is measured in some scenes, the requirement for the number of light spots is not high, therefore a diffractive optical element can be prevented from being used, the manufacturing cost ofthe lens is effectively reduced, the structure of the lens is simplified, and the assembling difficulty is also reduced. Through the lens, the distance between adjacent light spots can be increased,and therefore a larger field angle is formed.

Description

technical field [0001] The invention relates to the technical field of optical devices, in particular to a lens and a structured light projection module. Background technique [0002] Two-dimensional imaging devices can obtain two-dimensional plane information of objects. Due to the rapid improvement of people's living standards, traditional two-dimensional imaging devices have gradually been unable to meet people's daily needs. With the in-depth research of science and technology, on the basis of two-dimensional imaging, the three-dimensional imaging device can further obtain the depth information of the object, thereby constructing a three-dimensional three-dimensional model. [0003] In the 3D imaging device, the core component is the structured light emission module, which mainly projects the spot array to the target space through the collimating mirror and the diffraction element during projection, and uses the time-of-flight ranging to obtain the depth information of t...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a lens and a structured light projection module to solve the problem of using a collimator and a diffractive optical element in obtaining depth information in the existing structured light module. Taller and more complex questions

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