Light barrier receiver
First Claim
1. A light barrier receiver having a shallow housing comprising at least base and cover parts, a receiving lens arranged to one narrow side of the housing and adapted to concentrate a received light beam on a photoelectric converter arranged behind the lens, at least one of the base and cover parts incuding cylindrical positioning pin means, the photoelectric converter being adapted to allow response of an alarm signaller following interruption of the light beam of the light barrier receiver via a processing circuit, said receiving lens, photoelectric converter and alarm signaller and the processing circuit being mounted on a circuit board, the circuit board having a hole of a diameter equal to said cylindrical positioning pin means and being located thereover and resilient means bearing on the circuit board to secure the circuit board in position by rotationally biasing the circuit board about the positioning pin means against stop means.
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Accused Products
Abstract
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.
14 Citations
20 Claims
- 1. A light barrier receiver having a shallow housing comprising at least base and cover parts, a receiving lens arranged to one narrow side of the housing and adapted to concentrate a received light beam on a photoelectric converter arranged behind the lens, at least one of the base and cover parts incuding cylindrical positioning pin means, the photoelectric converter being adapted to allow response of an alarm signaller following interruption of the light beam of the light barrier receiver via a processing circuit, said receiving lens, photoelectric converter and alarm signaller and the processing circuit being mounted on a circuit board, the circuit board having a hole of a diameter equal to said cylindrical positioning pin means and being located thereover and resilient means bearing on the circuit board to secure the circuit board in position by rotationally biasing the circuit board about the positioning pin means against stop means.
Specification