公开(公告)号：US20230349695A1

公开(公告)日：2023-11-02

申请号：US18125591

申请日：2023-03-23

Applicant: TOPCON CORPORATION

Inventor： Masaho KIKUCHI ,  Masahiro OHISHI

IPC: G01B11/06 ,  G01C15/00

CPC classification number: G01C15/006 ,  G01B11/0608

Abstract: In a surveying instrument including an instrument height measuring unit the instrument height measuring unit includes a light transmitting unit configured to emit light, a beam splitter configured to be incident with light emitted from the light transmitting unit, split the incident light into reference light and distance-measuring light, send the reference light to a reference light path, and send the distance-measuring light to a distance-measuring light path, a first light receiving unit configured to receive the reference light, a second light receiving unit configured to receive light being the distance-measuring light that has been emitted toward a position below the vertical axis of the surveying instrument main body and returned by being reflected by a distance-measuring object, and an arithmetic unit configured to calculate the instrument height based on a difference between light reception signals generated by the first light receiving unit and the second light receiving unit.

公开(公告)号：US20180245917A1

公开(公告)日：2018-08-30

申请号：US15878830

申请日：2018-01-24

Applicant: TOPCON CORPORATION

Inventor： Akinobu SUGIURA ,  Masahiro OHISHI

IPC: G01C15/00 ,  G01C3/08 ,  G01S7/481

CPC classification number: G01C15/004 ,  G01C3/08 ,  G01C15/002 ,  G01S7/4812 ,  G01S17/08

Abstract: Provided is a surveying instrument including a light emitting section for emitting distance measuring light having an intensity distribution in which an intensity is high at the center and it became lower as approaching the periphery, a light receiving section for receiving the distance measuring light via a measurement object; and a distance-measurement optical system for guiding the light to the light receiving section via the measurement object. The surveying instrument performs a prism-mode and non-prism-mode measurements. The optical system includes an aperture diaphragm arranged in a distance-measurement optical path during the prism-mode-measurement. An opening of the aperture diaphragm has widths of greater than 0 and not greater than 0.5 times the full width at half maximum of the intensity distribution in a cross-section of non-prism-distance-measurement beam in the horizontal and vertical direction.