Distance measurement unit

Abstract

Abstract PURPOSE:To perform accurate measurement with detection of significant light only, by changing the reference voltage according to the output of the photoelectric conversion circuit, in detecting the distance through the detection of reflection light of pulsive optical beam with a plurality of photoelectric elements. CONSTITUTION:A plurality of photoelectric elements 9-12 of the light beam projection system used for the automatic focus adjuster of cameras are respectively connected to the photoelectric conversion circuits 13-16, and the output is fed to the reference voltage change circuit 70 consisting of the operational amplifiers 71- 74, 81, transistors 75-78, 82 and constant current source 84, and through the voltage comparison circuits 17-20, it is stored in the registers 21-24. Accordingly, as the comparison reference voltage of the voltage comparison circuits 17-20, the voltage in which the reflection light of maximum intensity from the measured body is changed according to the output of the photoelectric conversion circuit incident, can be given, allowing to exclude meaningless signal and to detect accurate distance.

Inventors

• 👤 Motonobu Matsuda

Bibliographic Details