Anti-theft security sensor assembly has level output circuit which outputs amount of infrared beam received by beam receiving unit, corresponding to physical opening of projector cover of projection unit

摘要

A projection unit (1) includes a generating circuit (8) which transmits a request to a receiving unit (2), to output the level of received infrared beam corresponding to the detection of the physical opening of the projector cover, by a detector switch (7). An output circuit (52) of the receiving unit, outputs the amount of received beam, accordingly.