公开(公告)号：US20220307646A1

公开(公告)日：2022-09-29

申请号：US17655548

申请日：2022-03-19

Applicant: Topcon Corporation

Inventor： Fumitoshi KASAHARA ,  Fumio OHTOMO ,  Naoki SHOJI ,  Masae MATSUMOTO ,  Jun ABE

IPC: F16M11/12 ,  F16M11/18 ,  G01C15/00

Abstract: The inclination sensor includes a gimbal mechanism rotatably supported around a first shaft and a second shaft, a first motor, a second motor, an acceleration sensor disposed in the gimbal mechanism with an origin point of coordinate axes being coincident with a point of intersection of a shaft center of the first shaft and a shaft center of the second shaft, and a control unit that simultaneously rotates the first shaft and the second shaft to continuously rotate the acceleration sensor around the first shaft and the second shaft and applies frequency analysis to the output values from the acceleration sensor to arithmetically determine the inclination angle with respect to the horizontal direction.

公开(公告)号：US20220283277A1

公开(公告)日：2022-09-08

申请号：US17685526

申请日：2022-03-03

Applicant: TOPCON CORPORATION

Inventor： Yasutoshi AOKI ,  Jun ABE ,  Yuichi OHASHI

IPC: G01S7/4912 ,  G01S17/34

Abstract: An electro-optical distance meter measures an electrical noise signal in a state where a received light amount adjusting means completely blocks light and measure a distance-measuring signal under a proper state of the adjusting means to calculate a distance by subtracting the electrical noise signal and an optical noise signal from the distance-measuring signal. The distance meter measures a first noise signal in a state where the adjusting means completely blocks light with a noise measuring jig having a unique jig-derived noise signal attached and a second noise signal in a state where the adjusting means transmits light most with the noise measuring jig attached, to calculate the optical noise signal by subtracting the first noise signal and the jig-derived noise signal from the second noise signal. The noise measuring jig is detachably attached to the electro-optical distance meter and removes reflected light entering the light receiving element when attached.

公开(公告)号：US20230015894A1

公开(公告)日：2023-01-19

申请号：US17812163

申请日：2022-07-12

Applicant: TOPCON CORPORATION

Inventor： Masae MATSUMOTO ,  Naoki SHOJI ,  Jun ABE

IPC: G01S17/26 ,  G01S17/36 ,  G01S7/487

Abstract: The light wave distance meter is disclosed, including: a distance measuring light-emitting unit; a light-receiving signal generating unit; and a control arithmetic unit. A light-receiving signal includes a first intermittent light-receiving signal corresponding to a first distance measuring light, a second intermittent light-receiving signal corresponding to a second distance measuring light, a third intermittent light-receiving signal corresponding to a third distance measuring light, and a fourth intermittent light-receiving signal corresponding to a fourth distance measuring light. The control arithmetic unit executes an error determination control to acquire a shift signal generated by shifting at least a phase of any one of the first to fourth intermittent light-receiving signals by 2π·n−π/2 or 2π·n+π/2, and compares the phase of the shift signal and the phase of the intermittent light-receiving signal at least between either the first frequencies or between the second frequencies.

公开(公告)号：US20220244381A1

公开(公告)日：2022-08-04

申请号：US17580147

申请日：2022-01-20

Applicant: TOPCON CORPORATION

Inventor： Yasutoshi AOKI ,  Jun ABE

IPC: G01S17/08 ,  G01S7/486

Abstract: Provided is an electro-optical distance meter includes a light transmitting unit configured to emit distance-measuring light along a collimation axis toward a measuring object; a light receiving unit including a light receiving element configured to receive reflected distance-measuring light and convert the reflected distance-measuring light into a distance-measuring signal, and a received light amount adjuster configured to adjust a light amount entering the light receiving element; an arithmetic control unit; and a storage unit. The arithmetic control unit calculates a true distance-measuring signal by subtracting an optical noise signal stored in advance in the storage unit and an electrical noise signal measured before a distance measurement from the distance-measuring signal, and calculates a distance to the measuring object based on the true distance-measuring signal.

公开(公告)号：US20170242124A1

公开(公告)日：2017-08-24

申请号：US15433722

申请日：2017-02-15

Applicant: TOPCON CORPORATION

Inventor： Katsuyuki NAGAI ,  Takahiro MAEHARA ,  Jun ABE

IPC: G01S17/08

CPC classification number: G01S17/08 ,  G01S7/4915 ,  G01S17/36 ,  G01S17/42

Abstract: Decrease in a measurable distance that occurs when a distance measuring light is obliquely incident on an object is suppressed. A distance measuring device 100 includes an emitting unit 103, a detecting unit 104, a frequency-modulated component separating unit 105, a selecting unit 107, and a distance calculating unit 108. The emitting unit 103 emits distance measuring light to an object to be measured. The distance measuring light is modulated by multiple modulation frequencies. The detecting unit 104 receives and detects light of the distance measuring light that is reflected from the object. The separating unit 105 separates components of the received reflected light into multiple frequency-modulated components. The selecting unit 107 selects a frequency-modulated component that has a received-light intensity exceeding a threshold value from among the separated multiple modulation frequencies. The distance calculating unit 108 calculates a distance to the object based on the selected frequency-modulated component.