Scattering light smoke alarm

US6515589B2 · kind B2 · utility

Assignee

• Robert Bosch GmbH · DE

Inventors

• Joachim Schneider · Ehringshausen, DE
• Anton Pfefferseder · Oberhaching, DE
• Bernd Siber · Glonn, DE
• Andreas Hensel · Egmating, DE
• Ulrich Oppelt · Zorneding, DE

Key dates

• Filing date: Sep 21, 2001
• Grant date: Feb 4, 2003
• Expiry date: Sep 21, 2021

Classification

• Technology area (CPC G): Physics
• CPC primary: G08B17/113
• WIPO field: Control
• WIPO sector: Instruments

Abstract

A scattering light smoke alarm has a light transmitter and a light receiver arranged so that a scattering point of the light transmitter and the light receiver are located outside the scattering light smoke alarm in a free space, a cover for protecting the light receiver and the light transmitter, and an element for distinguishing between smoke and other foreign bodies which are located in an area around the scattering point.