Communications: electrical – Condition responsive indicating system – Specific condition
340693, 361395, G08B 1318
A transmitting lens and a receiving lens are arranged alongside each other on one narrow side of a shallow housing so that a pencil beam of light transmitted by the transmitting lens and reflected by a separate reflector is received by the receiving lens and concentrated onto a photoelectric converter. Interruption of the pencil beam of light results in interruption of the output signal from the photoelectric converter and is detected and used to actuate an alarm signaller located within the housing. The alarm signaller, which is preferably a buzzer, is connected with the housing to form a single constructional unit. The optics and electronics are conveniently mounted on a circuit board which is conveniently located within the housing and secured by a resilient cushion.
patent: 3356904 (1967-12-01), Yonkers
patent: 3668476 (1972-06-01), Wrabel et al.
patent: 4156883 (1979-05-01), Walter et al.
Erwin Sick GmbH - Optik-Elektronik
Swann III Glen R.
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