公开(公告)号：US10371803B2

公开(公告)日：2019-08-06

申请号：US15452786

申请日：2017-03-08

Applicant: TOPCON CORPORATION

Inventor： Yoshikatsu Tokuda

IPC: G01S17/08 ,  G01S17/10 ,  G01S7/486 ,  G01S7/497

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：US11555898B2

公开(公告)日：2023-01-17

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：US10386466B2

公开(公告)日：2019-08-20

申请号：US15452791

申请日：2017-03-08

Applicant: TOPCON CORPORATION

Inventor： Yoshikatsu Tokuda

IPC: G01S17/10 ,  G01S7/486

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.

公开(公告)号：US10277006B2

公开(公告)日：2019-04-30

申请号：US15570415

申请日：2016-04-28

Applicant: TOPCON CORPORATION

Inventor： Suguru Miyagawa ,  Yoshiaki Goto ,  Yoshikatsu Tokuda

IPC: H01S5/042 ,  G01S17/10 ,  G01S7/484 ,  H01S5/0683 ,  G01R15/22 ,  H01S3/00 ,  H04B10/50 ,  G01S7/497

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.