Circuit with an exposure measuring unit for sensor controlled range measurement

US4334150A · 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 11, 1980
• Grant date: Jun 8, 1982
• Expiry date: Jul 11, 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 with two linear image sensors is disclosed. These sensors are exposed to lines corresponding to two images derived from one object. The sensor signals are subjected to correlation measurements, from which the range of the object is determined. An exposure-measuring circuit determines the optimum integration time of the sensor elements. In the case of such circuits, one sets as exact a distance measurement as possible. For this purpose, comparing sensor elements of the exposure-measuring circuit, which are provided with a mean value of the exposure of many sensor locations, are designed such that they extend only over a part of the sensor lines. They are arranged in a sequence which runs along the entire sensor line. A separate controlling of the optimum integration time proceeds over individual line portions. A range of application for the invention encompasses photographic and electronic cameras.