发明名称 |
Object detecting device with a pyroelectric sensor |
摘要 |
An object detecting device utilizes a pyroelectric sensor providing a sensing current, a voltage amplifier providing an amplified voltage proportional to the sensing current, and a level monitor providing a detection signal when the amplified voltage exceeds a detection threshold. The device has a standby mode where the voltage amplifier receives a limited source current to provide the voltage of low amplification, and the level monitor provides a wake-up signal when the low amplified voltage exceeds a preliminary threshold lower than the detection threshold. In response to the wake-up signal, the device is switched to an operation mode where the amplifier receives a rated source current to provide a voltage of high amplification for comparison with the detection threshold. Thus, the amplifier is kept to be less-power consuming in the absence of the wake-up signal, reducing a power requirement. <IMAGE> |
申请公布号 |
EP1291629(A3) |
申请公布日期 |
2003.10.15 |
申请号 |
EP20020005045 |
申请日期 |
2002.03.06 |
申请人 |
MATSUSHITA ELECTRIC WORKS, LTD. |
发明人 |
HIRONAKA, ATSUSHI;IKARI, MOTOO;TAKADA, YUJI;MATSUDA, HIROSHI;MURAYAMA, YORINOBU |
分类号 |
G01V8/10;G01J5/34;G08B13/191 |
主分类号 |
G01V8/10 |
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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