公开(公告)号：US20230080388A1

公开(公告)日：2023-03-16

申请号：US17931123

申请日：2022-09-11

Applicant: TOPCON CORPORATION

Inventor： Hideki MORITA ,  Yoshikatsu TOKUDA

IPC: G01S7/481 ,  G01S17/10

Abstract: Scanning density of laser scanning is increased at low cost. A laser scanning apparatus includes a vertical rotation unit and a controller. The vertical rotation unit emits pulses of laser scanning light. The controller controls emission of pulses of the laser scanning light. Assuming that a symbol “n” is a natural number of one or more, the controller controls so that a position in a rotation direction of emission of pulses of the laser scanning light for (n+1)th rotation of the vertical rotation unit will be different from that for nth rotation of the vertical rotation unit.

公开(公告)号：US20200271762A1

公开(公告)日：2020-08-27

申请号：US16798250

申请日：2020-02-21

Applicant: Topcon Corporation

Inventor： Yoshikatsu TOKUDA

IPC: G01S7/4861 ,  G01S13/10

Abstract: Provided is a distance measuring device which allows the measurement accuracy to be improved while the memory size is reduced. A distance measuring device includes a light emitting element which emits range-finding light as pulse light, a light receiving element which receives reflected range-finding light obtained as the range-finding light is reflected on a measurement object, an AD converter which converts the light reception signal output from the light receiving element from an analogue signal to a digital signal, multiple memories which have different memory sizes from each other and store sampled data output from the AD converter, and a rough distance calculator which calculates a distance on the basis of the sampled data stored in the multiple memories.

公开(公告)号：US20230081870A1

公开(公告)日：2023-03-16

申请号：US17931138

申请日：2022-09-12

Applicant: TOPCON CORPORATION

Inventor： Hideki MORITA ,  Yoshikatsu TOKUDA

IPC: G01S7/481 ,  G01S17/10

Abstract: Scanning density of laser scanning is increased at low cost. A laser scanning apparatus includes a horizontal rotation unit and a controller. The horizontal rotation unit determines an area of laser scanning. The controller controls rotation of the horizontal rotation unit. The horizontal rotation unit is rotated while the laser scanning is performed, whereby scanning using laser scanning light is performed in a vertical angle direction at a predetermined interval. The controller makes the horizontal rotation unit repeatedly rotate multiple times in angular ranges that partially overlap one another, in order to perform the laser scanning multiple times on areas of the laser scanning that overlap one another. Start positions of the rotation of multiple times of the horizontal rotation unit are successively shifted by a predetermined amount. The predetermined amount of shifting corresponds to a distance shorter than the predetermined interval.

公开(公告)号：US20180109073A1

公开(公告)日：2018-04-19

申请号：US15570415

申请日：2016-04-28

Applicant: TOPCON CORPORATION

Inventor： Suguru MIYAGAWA ,  Yoshiaki GOTO ,  Yoshikatsu TOKUDA

IPC: H01S5/042 ,  H01S5/0683 ,  H01S3/00 ,  G01R15/22 ,  H04B10/50

CPC classification number: H01S5/042 ,  G01R15/22 ,  G01S7/484 ,  G01S7/497 ,  G01S17/10 ,  H01S3/0057 ,  H01S5/0057 ,  H01S5/0683 ,  H01S5/06835 ,  H01S5/06837 ,  H04B10/504

Abstract: Provided is a technology for suppressing variations in the waveform of a light emission pulse caused by various factors in a light-emitting device. A light-emitting device is provided with: a light source 101 in which relaxation oscillation occurs immediately after energization; a light source drive circuit 104 which includes a differentiation circuit 102 having a resistor and a capacitor connected in parallel, and in which a switching element 103 for voltage application is connected in series with the differentiation circuit; a power supply circuit 105; a light-reception element 107 which detects pulsed light emitted from the light source 101; and a voltage control unit 109 which controls an output voltage from the power supply circuit 105 in correspondence with the waveform of the detected pulsed light.

公开(公告)号：US20170276773A1

公开(公告)日：2017-09-28

申请号：US15452786

申请日：2017-03-08

Applicant: TOPCON CORPORATION

Inventor： Yoshikatsu TOKUDA

IPC: G01S7/497 ,  G01S7/486 ,  G01S17/08

CPC classification number: G01S7/497 ,  G01S7/486 ,  G01S7/4861 ,  G01S7/4865 ,  G01S17/08 ,  G01S17/10

Abstract: A distance calculating unit includes a first filter for a detection signal of reference pulsed light, a second filter for measuring pulsed light, an adder circuit that adds outputs from the two filters together, an A/D converter that receives output from the adder circuit, a separated-signal calculating unit that analyzes output from the A/D converter and that generates a first separated signal and a second separated signal, a conversion processing unit that converts the phase of at least one of the two separated signals into a phase of a predetermined frequency, and a distance calculating unit that calculates a distance to an object by using a phase difference between the two separated signals and a correction parameter, which is obtained by making the reference pulsed light pass through the first filter and the second filter at the same time and by calculating a phase difference between outputs from these filters.

公开(公告)号：US20170276772A1

公开(公告)日：2017-09-28

申请号：US15452791

申请日：2017-03-08

Applicant: TOPCON CORPORATION

Inventor： Yoshikatsu TOKUDA

IPC: G01S7/486 ,  G01S17/10

CPC classification number: G01S7/4861 ,  G01S7/4865 ,  G01S17/10

Abstract: A distance calculating unit includes a first filter that receives a detection signal of reference pulsed light, a second filter that receives a detection signal of measuring pulsed light, an adder circuit that adds the outputs from the two filters together, an A/D converter that receives the output signal from the adder circuit, and a separated-signal calculating unit that analyzes the output from the A/D converter and that generates a first separated signal corresponding to a reference detection signal and a second separated signal corresponding to a measurement detection signal. The distance calculating unit further includes a conversion processing unit that converts the phase of at least one of the two separated signals into a phase of a predetermined frequency, and a distance calculating unit that calculates a distance to an object by using a phase difference between the two separated signals in the predetermined frequency.