Optical arrangement for a passive infrared motion detector

US4268752A · kind A · utility

Assignee

• Heimann GmbH · DE

Inventors

• Thomas Herwig · Eltville am Rhein, DE
• Gerhard Doenges · Nastätten, DE

Key dates

• Filing date: May 21, 1979
• Grant date: May 19, 1981
• Expiry date: May 21, 1999

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10S250/01
• WIPO field: Control
• WIPO sector: Instruments

Abstract

An optical arrangement for a passive infrared motion detector which has an infrared detector unit and a system for directing infrared radiation from at least two separate directions to be monitored onto the detector unit characterized by the system including a single focusing device and separate, flat reflecting surfaces or directing mirrors, which are arranged with at least one flat reflecting surface associated with each direction to be monitored to reflect a beam or solid angle of radiation from the direction onto the single focusing device which device will focus the radiation along a folded beam path to the detector unit.