公开(公告)号：US06737977B2

公开(公告)日：2004-05-18

申请号：US10040629

申请日：2002-01-09

申请人： Takayuki Nishikawa ,  Shoichi Oka ,  Koji Sakamoto ,  Takeshi Wada ,  Yasuyuki Kawano ,  Kenji Toyoda ,  Naoya Nagasawa ,  Shinji Kirihata

发明人： Takayuki Nishikawa ,  Shoichi Oka ,  Koji Sakamoto ,  Takeshi Wada ,  Yasuyuki Kawano ,  Kenji Toyoda ,  Naoya Nagasawa ,  Shinji Kirihata

IPC分类号： G08B1710

CPC分类号： G08B17/06 ,  G08B17/107 ,  G08B17/113 ,  G08B29/183

摘要： An improved fire detector unit has a plastic base defining a smoke chamber for detection of a smoke density in terms of light scattering due to the smoke particles in the smoke chamber. The base carries a circuit board mounting a light emitting element, a light receiving element, and other components forming a fire detecting circuit responsible for generating a fire warning signal based upon the detected smoke density. A metal-made electromagnetic shield is molded into the base to protect the light receiving element from electromagnetic radiation noises. The electromagnetic shield includes a ground terminal for connection with a ground line of the circuit board. In addition, terminal pins are molded into the base for electrical and physical connection of the circuit board to the base.

摘要翻译： 改进的火灾探测器单元具有限定烟室的塑料基座，用于根据烟雾室中的烟雾颗粒在光散射方面检测烟雾浓度。 底座承载安装发光元件的电路板，光接收元件和形成火灾检测电路的其他部件，该电路负责基于检测到的烟雾浓度产生火警警告信号。 金属制的电磁屏蔽件被模制到基座中以保护光接收元件免受电磁辐射噪声。 电磁屏蔽包括用于与电路板的接地线连接的接地端子。 此外，端子销被模制到基座中，用于将电路板与基座的电气和物理连接。