Security sensor system

Details Security sensor system Security sensor system

2007-01-16

2007-01-16

Pyo, Kevin (Department: 2878)

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

C250S205000, C250S341100, C340S545300, C340S555000

Reexamination Certificate

active

11189716

ABSTRACT:
A security sensor system includes beam projecting and receiving units (1) and (2). The proper range of the received beam level is adjusted with change in time of the received beam level so that in the case that the received beam level departs from the proper range, the amount of beam projected from the beam projecting unit (1) can be adjusted to enable the received beam level to fall within the proper range. The unit (2) includes a received beam level detector (27), a level setting circuit (28) for setting a proper range of the received beam level, a request signal output circuit (30) for outputting a request signal requesting an adjustment of the amount of beam, and a transmitter (33) for transmitting the request signal to the unit (1). The unit (1) includes a beam projecting power adjustor (15) operable in response to the request signal.

REFERENCES:
patent: 5596310 (1997-01-01), Itoh
patent: 6714131 (2004-03-01), Iwasawa et al.
patent: 6998982 (2006-02-01), Iwasawa
patent: 2004/0113779 (2004-06-01), Iwasawa
patent: 0 466 522 (1992-01-01), None
patent: 2002-367045 (2002-12-01), None

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