Circuit for the sensor controlled distance measurement

US4370724A · kind A · utility

Assignee

• Siemens Aktiengesellschaft · DE

Inventors

• Heiner Herbst · Haar, DE
• Hans-Joerg Pfleiderer
• Hans-Peter Grassl · Zorneding, DE

Key dates

• Filing date: Jul 24, 1980
• Grant date: Jan 25, 1983
• Expiry date: Jul 24, 2000

Classification

• Technology area (CPC G): Physics
• CPC primary: G01C3/085
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

A circuit for sensor controlled distance measurement is disclosed having two linear image sensors which are positioned to receive corresponding lines of two images derived from an object. The sensor signals are subjected to correlation measurements from which the distance of the object is determined. In the case of circuits of this sort, one endeavors to attain as exact and unfalsified a distance measurement as possible. For this purpose, the sensor signals are digitalized in evaluators, then read via transfer transistors into shift registers which undertake relative position displacements of the sensor signals in a longitudinal direction of the image sensors between individual signal cycles, and are subject to a correlation measurement. The circuit distinguishes itself in that the digital evaluation proceeds completely independently of parameters of the shift register and is thus carried out very precisely. Applications include photographic and electronic cameras.