公开(公告)号：US20180074197A1

公开(公告)日：2018-03-15

申请号：US15702951

申请日：2017-09-13

Applicant: TOPCON CORPORATION

Inventor： Hideki MORITA ,  Ken'ichiro YOSHINO

IPC: G01S17/10

CPC classification number: G01S17/10 ,  G01S7/4861 ,  G01S7/497

Abstract: A distance measuring device is provided at low cost. The distance measuring device includes an avalanche photodiode, a TIA, and damping circuits. The avalanche photodiode detects pulsed light that is reflected from an object to be measured. The TIA is an amplifier circuit that converts electric current output from the avalanche photodiode into a voltage signal. The damping circuits and are arranged in a rear stage of the TIA and convert pulse signals into signals with a damped oscillation waveform. The signal path from the avalanche photodiode to the TIA allows a direct current signal to pass therethrough.

公开(公告)号：US20230077077A1

公开(公告)日：2023-03-09

申请号：US18050962

申请日：2022-10-28

Applicant: TOPCON CORPORATION

Inventor： Yasushi TANAKA ,  Takaaki SAITO ,  Ken'ichiro YOSHINO ,  Mitsuru KANOKOGI

IPC: G01S7/481 ,  G01S7/497 ,  G01J3/10 ,  G01S17/89 ,  G01S17/10 ,  G01S17/42

Abstract: A 3-dimensional measuring device includes: a light source unit; a projection optical system; a scanning mirror that is provided to be rotatable about a rotating shaft in a state of being inclined with respect to a shaft center of the rotating shaft to radiate a range-finding light within a plane crossing the rotating shaft in a rotary manner; a light-receiving optical system that receives a reflection range-finding light; a reference light optical system that is provided in a range outside a measuring range within a radiation range to receive and reflect the range-finding light as an internal reference light, the reference light optical system being capable of changing a light quantity of the internal reference light; and a light receiving element that receives the reflection range-finding light and the internal reference light.

公开(公告)号：US20190064326A1

公开(公告)日：2019-02-28

申请号：US16106309

申请日：2018-08-21

Applicant: TOPCON CORPORATION

Inventor： Yasushi TANAKA ,  Takaaki SAITO ,  Ken'ichiro YOSHINO ,  Mitsuru KANOKOGI

IPC: G01S7/481 ,  G01S7/497 ,  G01J3/10

Abstract: A 3-dimensional measuring device includes: a light source unit; a projection optical system; a scanning mirror that is provided to be rotatable about a rotating shaft in a state of being inclined with respect to a shaft center of the rotating shaft to radiate a range-finding light within a plane crossing the rotating shaft in a rotary manner; a light-receiving optical system that receives a reflection range-finding light; a reference light optical system that is provided in a range outside a measuring range within a radiation range to receive and reflect the range-finding light as an internal reference light, the reference light optical system being capable of changing a light quantity of the internal reference light; and a light receiving element that receives the reflection range-finding light and the internal reference light.

公开(公告)号：US20190227171A1

公开(公告)日：2019-07-25

申请号：US16369670

申请日：2019-03-29

Applicant: TOPCON CORPORATION

Inventor： Hideki MORITA ,  Ken'ichiro YOSHINO

IPC: G01S17/10 ,  H05K1/02

Abstract: A circuit configured to emit pulsed light includes a voltage generating circuit, a light emitting element, a circuit wiring that connects the voltage generating circuit and the light emitting element, a charge capacitor with its end connected to the circuit wiring, and a switching element configured to be turned on or off to apply voltage to the light emitting element. The inductance component for the circuit wiring is derived based on a relationship of the pattern length, pattern width and pattern thickness of the circuit wiring. In this manner, an inductance value of not greater than 1.4 nH can be set and suitably used for achieving an attenuation of at or below 3 dB in a circuit emitting light at a pulse width of 2 ns or less.

公开(公告)号：US20180284238A1

公开(公告)日：2018-10-04

申请号：US15935138

申请日：2018-03-26

Applicant: TOPCON CORPORATION

Inventor： Hideki MORITA ,  Ken'ichiro YOSHINO ,  Yasushi TANAKA

IPC: G01S7/481 ,  G01S17/42 ,  G01S17/89

CPC classification number: G01S7/4818 ,  G01B11/002 ,  G01C15/002 ,  G01S7/4813 ,  G01S17/42 ,  G01S17/89

Abstract: A three-dimensional measurement device includes a light source unit that emits distance measurement light, a projection light optical system that causes the distance measurement light, emitted by the light source unit, to be emitted along a distance measurement light axis, a light receiving optical unit that receives the reflected distance measurement light, a light receiving and splitting unit that splits the reflected distance measurement light that has transmitted through the light receiving optical unit into first reflected split light and second reflected split light, attenuates intensity of the second reflected split light to be lower than intensity of the first reflected split light, and converts the first reflected split light and the second reflected split light into electrical signals, and angle detection units that detect a light emitting direction of the distance measurement light.