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公开(公告)号：US20200003879A1
公开(公告)日：2020-01-02
申请号：US16025499
申请日：2018-07-02
Applicant: STMicroelectronics Ltd
Inventor： Guy AMOR , Tzvi PHILIPP , Elan ROTH
Abstract: A laser ranging system includes a light source emitting a beam of collimated light. A beam splitter polarizes the beam with a first type of linear polarization. A wave plate receives the beam from the beam splitter and polarizes the beam with a circular polarization. A movable mirror scans the beam across a target, receives a return beam from the target, and reflects the return beam toward the wave plate. The wave plate polarizes the return beam with a second type of linear polarization. The beam splitter receives the return beam from the wave plate. A detector detects arrival of the return beam from the beam splitter. A circuit receives determines a distance to the target as a function of a time interval between emission of the beam and arrival of the return beam.
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公开(公告)号：US20210048737A1
公开(公告)日：2021-02-18
申请号：US16540557
申请日：2019-08-14
Applicant: STMicroelectronics LTD
Inventor： Eli YASER , Guy AMOR , Yotam NACHMIAS , Dadi SHARON , Sivan NAGOLA
Abstract: A control circuit includes a first control circuit generating a first drive control signal from a pre-drive signal (that is a frequency at which an opening angle of the first and second mirrors is equal) for the first mirror. A second control circuit generates a second drive control signal from the pre-drive signal for the second mirror. First and second drivers generate first and second drive signals for the first and second mirrors from the first and second drive control signals. The first and second drive control signals are generated so that the first and second drive signals each have a same frequency as the pre-drive signal but are different in amplitude from one another to cause the first and second mirrors to move at a same frequency, with a same and substantially constant given opening angle as one another, and in phase with one another.
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