An improved optical smoke detector is obtained if at least one planar-optical element (5) is arranged in the beam path between radiation source (1) and radiation receiver (2). This element can be either a diffractive element, preferably a holographic-optical element (HOE) or a micro-Fresnel reflector (MFR). <IMAGE>
申请公布号
EP0588232(B1)
申请公布日期
1997.07.09
申请号
EP19930114472
申请日期
1993.09.09
申请人
CERBERUS AG
发明人
MUELLER, KURT;RYSER, PETER;WIESER, DIETER;KUNZ, RINO ERNST;ROSSI, MARKUS;GALE, MICHAEL THOMAS