The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Aug. 25, 2015
Filed:
Mar. 28, 2011
Thomas Hanses, Feldkirchen-Westerham, DE;
Gerhard Gruener, Riemerling, DE;
Wolfgang Werkmeister, Poing, DE;
Joerg Tuermer, Ebersberg, DE;
Thomas Hanses, Feldkirchen-Westerham, DE;
Gerhard Gruener, Riemerling, DE;
Wolfgang Werkmeister, Poing, DE;
Joerg Tuermer, Ebersberg, DE;
Robert Bosch GmbH, Stuttgart, DE;
Abstract
A photoelectric smoke detectorfor detecting smoke particlesis disclosed, the smoke detectorcomprising: a light emitting element, a light receiving elementfor receiving lightemitted by the light emitting elementand scattered by the smoke particlesand for outputting a detection signalobtained by photoelectrical converting the received light, an amplifier circuitfor amplifying the detection signaland providing an amplified output signal, wherein the amplified output signalmay be divided into an offset-signaland an amplified detection signal, whereby the photoelectric smoke detectoris adapted to operate in a pulsed mode, so that the detection signalcomprises high-frequency components, whereby the amplified detection signalis determined by high-frequency components of the detection signaland that the offset-signalis determined by low-frequency components of the detection signaland/or by low-frequency components of at least an intermediate signal based on the detection signal, and whereby the amplifier circuitis adapted to transfer the high-frequency components with a higher gain and to transfer the low-frequency components with a lower gain in order to improve the signal ratio between the amplified detection signaland the offset-signal