Light scattering type smoke detector,申请号US201012683926-传众专利搜索

Light scattering type smoke detector

申请公布号：US8773272(B2)

申请号：US201012683926

申请日期：2010.01.07

申请公布日期：2014.07.08

申请人：

Hochiki Corporation

发明人：Nagashima Tetsuya

分类号：G08B17/10

主分类号：G08B17/10

代理机构：

Sherr & Jiang, PLLC

代理人：Sherr & Jiang, PLLC

地址：Tokyo JP

摘要：A light scattering type smoke sensor includes a sensor body, light-emitter for emitting light toward an open smoke-sensing space and outputting a light-received signal according to the amount of scattering light received, and a fire judging unit for judging whether fire occurs or not on the basis of the amount of received light determined on the basis of the outputted light-received signal.

主权项：1. A light scattering type smoke sensor comprising: a sensor body; a light-emitter that is incorporated in the sensor body to emit light toward an open smoke-sensing space located outside the sensor body; a light-receiver that is incorporated in the sensor body to receive scattered light generated by the light emitted from the light-emitter to the smoke-sensing space, and to output a light-received signal corresponding to an amount of received light scattered; and a fire judging unit that judges presence/absence of fire occurrence based on the amount of received light identified by the light-received signal output from the light-receiver, wherein the fire judging unit judges that fire occurs, when the amount of received light exceeds a predetermined first fire threshold for a time equal to or longer than a predetermined first set time, and the amount of received light exceeds a predetermined second fire threshold which is higher than the first fire threshold for a time equal to or longer than a predetermined second set time.