DISTANCE MEASURING INSTRUMENT

摘要

PURPOSE:To measure the distance of an object to be measured with high accuracy by providing an observation part to photodetect reflected light at peripheral plural places of a projection part to irradiate the projection light and photodetecting the reflected light with the intense reflected light. CONSTITUTION:The projection light 15 is irradiated on the object 13 to be measured from the projection part 25 and at the same time, a motor 35 is driven to turn a measuring header 23. The photodetected position of the reflected light 17 on the photodetection surface of an optical detecting element 31 and the intensity of the reflected light 17 at the photodetected position are made electrical signals and inputted to a measurement controller 39. This measurement controller 39 drives the motor 35 and turns the measuring header 23 and stops the measuring header 23 at the position where the intensity of the reflected light of the reflected light incident on the observation part 27 is made maximum. In this way, the reflected light with the intense reflected light is photodetected and the photodetected position of the reflected light can be accurately detected by the optical detecting element 31.