公开(公告)号：US20190302233A1

公开(公告)日：2019-10-03

申请号：US16365523

申请日：2019-03-26

Applicant: TOPCON CORPORATION

Inventor： Nobuyuki NISHITA ,  Takashi TAKAHASHI ,  Tatsuya KOJIMA ,  Saki HORITA

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

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.