公开(公告)号：US11774238B2

公开(公告)日：2023-10-03

申请号：US17426540

申请日：2020-01-10

申请人： Hangzhou UPhoton Optoelectronics Technology Co., Ltd.

发明人： Xiaodong Yin ,  Kehan Tian ,  Lixin Wei

IPC分类号： G01B11/25 ,  G01B11/02 ,  G02B27/42

CPC分类号： G01B11/2513 ,  G01B11/026 ,  G02B27/4205

摘要： A light projection method with safety protection and a light projection device with safety projection. The light projection method (200) comprises: turning on a light source at a safe power level (S201); using a diffractive optical element to modulate light emitted from the light source so as to project a pattern onto a target surface (S202); acquiring the pattern (S203); determining whether the pattern is normal (S204); and if so, turning on the light source at a rated power level, wherein the rated power level is higher than the safe power level (S205). The invention enables an optical system to have a smaller size while ensuring safety of a user, simplifies a structure, reduces costs, and facilitates efficient utilization of optical energy.