Anti-thief security sensor assembly with variable amount of...

Details Anti-thief security sensor assembly with variable amount of... Anti-thief security sensor assembly with variable amount of...

2006-02-14

2006-02-14

Wu, Daniel (Department: 2632)

Communications: electrical

Condition responsive indicating system

Specific condition

C340S552000, C340S556000

Reexamination Certificate

active

06998982

ABSTRACT:
To provide an anti-thief security sensor assembly capable of automatically setting a projecting power in such a manner that a received beam amount of the anti-thief security sensor assembly for detecting an infrared beam interrupted to sense an intruder attains a predetermined value during an optical axis adjustment, the anti-thief security sensor assembly includes an infrared beam projecting unit (1) for emitting the infrared beam (IR), and an infrared beam receiving unit (2) for receiving the infrared beam (IR). The infrared beam receiving unit (2) has a received beam amount detector (26) for detecting the received beam amount, and a signal transmitter (28) for transmitting a received beam level display signal (L) indicative of the amount of the received beam detected to the infrared beam projecting unit (1). The infrared beam projecting unit (1) has a projecting power adjuster (15) for, on the basis of the received beam level display signal (L), adjusting a projecting power so that the amount of the received beam attains the predetermined value.

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