公开(公告)号：US11754679B2

公开(公告)日：2023-09-12

申请号：US16365523

申请日：2019-03-26

Applicant: TOPCON CORPORATION

Inventor： Nobuyuki Nishita ,  Takashi Takahashi ,  Tatsuya Kojima ,  Saki Horita

IPC: G01S7/48 ,  G01S7/481 ,  G02B26/00 ,  G01S17/10

CPC classification number: G01S7/4814 ,  G01S17/10 ,  G02B26/005

Abstract: An electro-optical distance meter includes a light source configured to emit light for distance measurement, a detector configured to receive the light and generate a distance measurement signal, a calculator configured to measure the distance from the distance measurement signal, an external optical path configured to guide the light from the light source to a target as measurement light, an internal optical path configured to guide the light from the light source directly to the detector as reference light, and a liquid shutter that can select one of the external and internal optical paths as the optical path through which the light from the light source travels by switching a region of light-blocking liquid.