发明名称 |
Fire detector unit |
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.
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申请公布号 |
US6737977(B2) |
申请公布日期 |
2004.05.18 |
申请号 |
US20020040629 |
申请日期 |
2002.01.09 |
申请人 |
MATSUSHITA ELECTRIC WORKS, LTD. |
发明人 |
NISHIKAWA TAKAYUKI;OKA SHOICHI;SAKAMOTO KOJI;WADA TAKESHI;KAWANO YASUYUKI;TOYODA KENJI;NAGASAWA NAOYA;KIRIHATA SHINJI |
分类号 |
G08B17/107;(IPC1-7):G08B17/10 |
主分类号 |
G08B17/107 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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