Laser screen projection scanning method and device

Abstract

The invention discloses a laser screen projection scanning method and device, especially a miniature laser projection scanning device, and belongs to the laser projection equipment technical field. In the method, scattering laser beams generated by a laser are shaped by a collimating lens to form parallel light beams; the parallel light beams are reflected by the reflector of a scanning galvanometer to form narrower scanning light beams; the scanning light beams are radiated into wide scanning light beams through a curved lens, and meanwhile a shield window adjusts an emitting angle and shape to further control the scanning light beams; a coupled control system controls the on and off, and intensity of the laser, and the rotation frequency, amplitude and phase of the scanning galvanometer to form required two-dimensional projection. In the method, parallel light beams are radiated through the scanning galvanometer and the lens, so that the two difficulties of scanning module light beam uniformity and parallelism are solved at the same time. Compared with a common projection system, the device possesses a smaller size and lower consumption.

Description

technical field [0001] The invention discloses a laser light curtain projection scanning method and device, in particular to a miniature laser projection scanning device. It belongs to the technical field of laser projection equipment. Background technique [0002] In the laser projection device, it is a commonly used 3D scanning imaging technology to irradiate a specific pattern onto the object to be measured, and then calculate the information of the object by photographing the pattern modulated by the surface of the object. Scanning pattern is an important technology in 3D scanning imaging, and it is a limiting factor of 3D scanning imaging quality. The laser light curtain projection scanning device based on the scanning galvanometer can realize a high-quality adjustable light curtain, and can save a lot of volume and weight. For example, on mobile devices such as mobile phones, due to size limitations, a projection scanning system with a small volume is required. Ther...

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Problems solved by technology

At the same time, it solves the two major problems of the traditional single cylinder lens optical scanning module: one is that the energy distribution of the scanning beam is uneven, and the scanning beam presents a situation where the energy density in the middle is high and the two sides are low; the other is that the light moves to When the angle of incidence is not normal, the scanning light is bent on both sides

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