公开(公告)号：EP4152744A1

公开(公告)日：2023-03-22

申请号：EP22195417.5

申请日：2022-09-13

Applicant: STMicroelectronics Ltd ,  STMicroelectronics S.r.l.

Inventor： DOMNITS, Alex ,  ROTH, Elan ,  TERZI, Davide ,  MOLINARI, Luca ,  BOSCHI, Marco

IPC: H04N9/31

Abstract: A scanning laser projector (40) includes an optical module (10) and projection engine (41). The optical module includes a laser generator outputting a laser beam, and a movable mirror (20, 24) scanning the laser beam across an exit window defined through the housing in a scanning pattern wider than the exit window such that the laser beam is directed through the exit window in a projection pattern that is smaller than and within the scanning pattern. A first light detector (18a, 18b) is positioned about a periphery of the exit window such that as the movable mirror scans the laser beam in the scan pattern, at a point in the scan pattern where the laser beam is scanned across an interior of the housing and not through the exit window, the laser beam impinges upon the first light detector. The projection engine (41) adjusts driving of the movable mirror based upon output from the first light detector (18a, 18b).

公开(公告)号：EP3591425A1

公开(公告)日：2020-01-08

申请号：EP19183652.7

申请日：2019-07-01

Applicant: STMicroelectronics Ltd

Inventor： AMOR, Guy ,  PHILIPP, Tzvi ,  ROTH, Elan

IPC: G01S7/481 ,  G01S7/499 ,  G01S17/10

Abstract: A laser ranging system (5) includes a light source (32, 34) emitting a beam (31) of collimated light. A beam splitter (12) polarizes the beam with a first type of linear polarization. A wave plate (14) receives the beam from the beam splitter (12) and polarizes the beam with a circular polarization. A movable mirror (16) scans the beam across a target (22), receives a return beam (17) from the target, and reflects the return beam toward the wave plate (14). The wave plate polarizes the return beam with a second type of linear polarization. The beam splitter (12) receives the return beam (23) from the wave plate (14). A detector (20) detects arrival of the return beam from the beam splitter (12). A circuit (18) determines a distance to the target as a function of a time interval between emission of the beam (31) of collimated light and arrival of the return beam (23).