公开(公告)号：US20230305151A1

公开(公告)日：2023-09-28

申请号：US18121391

申请日：2023-03-14

Applicant: TOPCON CORPORATION

Inventor： Yasutoshi AOKI

IPC: G01S17/34 ,  G01S7/4911 ,  G01S7/4914 ,  G01S7/48

CPC classification number: G01S17/34 ,  G01S7/4808 ,  G01S7/4911 ,  G01S7/4914

Abstract: Provided is an electro-optical distance meter includes: a first light emitting element transmitting a distance measurement light modulated based on main modulation frequencies F2, F3 to a distance measurement optical path; a second light emitting element transmitting a reference light modulated with adjacent modulation frequencies F2+b·F2, F3+b·F3 close to the main modulation frequencies F2, F3 to a reference optical path; a light receiving element receiving a distance measurement light and a reference light; and frequency converters receiving inputting of a light reception signal based on the distance measurement light and the reference light and signals of local frequencies 2+a·F2, F3+a·F3, and generate a distance measurement intermediate frequency signal based on the distance measurement light and a reference intermediate frequency signal based on the reference light. A distance to a target reflection object is calculated by subtracting the reference intermediate frequency signal from the distance measurement intermediate frequency signal.

公开(公告)号：US20210063153A1

公开(公告)日：2021-03-04

申请号：US16985778

申请日：2020-08-05

Applicant: TOPCON CORPORATION

Inventor： Yosuke OKUDAIRA ,  Akinobu SUGIURA ,  Yasutoshi AOKI

IPC: G01C15/00 ,  G01C3/02

Abstract: Provided is a surveying instrument configured so that the optical axis of a guide light irradiation unit that irradiates guide light for guiding a survey operator and the optical axis of a lens barrel portion of a distance-measuring optical system become parallel to each other on a horizontal plane. The guide light irradiation unit is not disposed above the lens barrel portion that substantially matches a collimation direction is horizontally shifted with respect to the lens barrel portion. The horizontal shift distance D is configured so that a horizontal distance D between the optical axis of guide light and the optical axis of the lens barrel portion satisfies tan(α/2)×Cmin>D provided that α is an irradiation angle of the guide light in the horizontal direction, and Cmin is a shortest use distance of the surveying instrument.

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：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.