Patent ID: 6696946
Filing Date: 2004-02-24
Classification: G08B

Abstract:
An anti-thief security sensor assembly including a beam projecting unit for emitting an infrared beam, and a beam receiving unit for receiving the infrared beam emitted from the beam projecting unit, wherein when a human body intercepts passage of the infrared beam traveling from the beam projecting unit towards the beam receiving unit, the human body can be detected, said assembly comprising:a beam projecting unit including a first switch adapted to be activated when a cover protecting the beam projecting unit is removed and for outputting a discriminative signal descriptive of removal of such cover, and a transmitting circuit for transmitting the discriminative signal from the beam projecting unit to the beam receiving unit; and a beam receiving unit including a recognizing circuit for receiving the discriminative signal and outputting a notifying signal to notify the removal of the cover.