公开(公告)号：US20210325534A1

公开(公告)日：2021-10-21

申请号：US17193599

申请日：2021-03-05

Applicant: FUJITSU LIMITED

Inventor： Katsushi Sakai ,  Koichi Tezuka ,  Koichi Iida ,  KOSUKE YANAI

IPC: G01S17/08 ,  G01S17/894 ,  G01S7/4865

Abstract: A measurement method executed by a computer, the method includes executing transmission processing and measuring processing, the transmission processing including a process of notifying a first signal instructing light emitting processing and the measuring processing, the measuring processing including a process of identifying a distance by measuring a time from a reception time of the first signal; setting a communication path for notifying a second signal output by the transmission processing to the measuring processing via a transceiver for transmitting a synchronization signal, the synchronization signal being for notifying an external measurement device of a light emission output by the light emitting processing; and identifying a timing for transmitting the synchronization signal output by the transmission processing based on a time difference between a time for receiving the second signal not through the transceiver and a time for receiving the second signal via the transceiver.

公开(公告)号：US20220018937A1

公开(公告)日：2022-01-20

申请号：US17307425

申请日：2021-05-04

Applicant: FUJITSU LIMITED

Inventor： Koichi Tezuka ,  Koichi Iida ,  Katsushi Sakai ,  KOSUKE YANAI

IPC: G01S7/484 ,  G01S7/497 ,  G01S17/10

Abstract: A distance measurement device includes the plurality of laser sensors and a processor. The plurality of laser sensors configured to project a laser beam and receive reflected light from a measurement target that moves within a measurement region. The processor configured to drive, based on the measurement region and a provision position of the plurality of laser sensors, each of the laser sensors at a light emission cycle in which a light receiving window that receives reflected light of own light and an interference risk range are included the interference risk range being a range in which an interference is caused by a laser beam from another laser sensor. The processor controls to laser beam emission timings of the plurality of laser sensors so as to be different from each other.

公开(公告)号：US20220411258A1

公开(公告)日：2022-12-29

申请号：US17896257

申请日：2022-08-26

Applicant: FUJITSU LIMITED

Inventor： Koichi Iida ,  Arata EJIRI ,  KOSUKE YANAI ,  Shinichi Fujiyoshi ,  Koichi Tezuka ,  Takeshi MORIKAWA ,  Katsushi Sakai

IPC: B81B7/00 ,  G01S17/42 ,  G01S7/481

Abstract: A scanning-type distance measurement apparatus that includes a two-dimensional micro electro mechanical system (MEMS) mirror that reflects a laser beam includes: a memory; and a processor coupled to the memory and configured to: drive, on an axis that controls an angle of view out of two axes orthogonal to each other of the two-dimensional MEMS mirror, the axis of the two-dimensional MEMS mirror with a drive signal; and control a scanning angle range of the laser beam when a drive waveform of the drive signal is offset by an offset amount to shift a center angle of the scanning angle range, on the basis of the offset amount according to a shift direction from the center angle.

公开(公告)号：US20220206251A1

公开(公告)日：2022-06-30

申请号：US17700333

申请日：2022-03-21

Applicant: FUJITSU LIMITED

Inventor： Arata EJIRI ,  KOSUKE YANAI ,  Shinichi Fujiyoshi ,  Koichi Iida

IPC: G02B7/182 ,  G01S7/481 ,  G01S17/08

Abstract: A mirror control device configured to output a signal that indicates a first frame immediately after the angle-of-view change and a shift change amount, generate a shift correction amount and a scanning angle range correction amount that correspond to an expected deviation amount in the first frame using the shift change amount, output a corrected angle-of-view parameter and a corrected scanning angle range, drive the scanning mirror in the first direction to drive the scanning mirror, based on output of the angle-of-view parameter correction means, drive the scanning mirror in the second direction to drive the scanning mirror through a low-pass filter.

公开(公告)号：US20230082295A1

公开(公告)日：2023-03-16

申请号：US17990259

申请日：2022-11-18

Applicant: FUJITSU LIMITED

Inventor： KOSUKE YANAI ,  Shinichi Fujiyoshi ,  Yoshikatsu KOHARA ,  Etsuko YAMASHITA ,  Koichi Iida ,  Katsushi Sakai

IPC: G01S17/26 ,  G01S7/4865 ,  G01S7/481

Abstract: A measurement device includes: a memory; and a processor coupled to the memory and configured to: generate a drive signal with a sine wave, according to a clock signal; control a reflection direction of output light of a light emitting device, by utilizing a resonance frequency, according to the drive signal; control a timing at which the drive signal is generated; and add or remove a pulse of a reference clock signal configured to generate the clock signal, according to a phase difference between a desired control signal and the control signal.

公开(公告)号：US20220082666A1

公开(公告)日：2022-03-17

申请号：US17464822

申请日：2021-09-02

Applicant: FUJITSU LIMITED

Inventor： KOSUKE YANAI ,  Yoshikatsu KOHARA ,  Shinichi Fujiyoshi ,  Koichi Iida ,  Takeshi MORIKAWA ,  Katsushi Sakai

IPC: G01S7/481 ,  G01S17/46 ,  G02B26/08 ,  G02B26/10

Abstract: A laser sensor includes: a micro electro mechanical systems (MEMS) mirror that performs scanning in a reflection direction of laser light of a light emitting device on a first axis in a resonance direction and a second axis in a non-resonant direction; and a processor that performs control that synchronizes a drive cycle of the second axis with the drive cycle of the second axis of the MEMS mirror mounted on another laser sensor, using a timing designated based on the drive cycle of the first axis.