Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1987-12-07
1989-01-24
Westin, Edward P.
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
340644, 341 31, H03K 1794, H03K 17969
Patent
active
048002640
ABSTRACT:
The invention relates to a manually controlled static switch. This switch comprises a body having a slot with a base wall, bordered on either side by first and second recesses, so that the slot has at least two walls transparent to electromagnetic radiation positioned laterally with respect to the base wall and which are substantially parallel to one another, an electromagnetic radiation beam emitter disposed in the first recess, so as to be able to supply beams to said second recess, a radiation--sensitive receiver located in the second recess and which detects the beams, the receiver emitting an output signal having two different levels depending on whether the receiver does or does not receive the beam. The base wall is made from a transparent material and the switch also comprises a visible light source positioned behind the base wall of the slot and oriented so as to illuminate the interior of the slot through the base wall and means for controlling the source as a function of the value of the output signal of the sensitive receiver.
Application to static switches.
REFERENCES:
patent: 3398290 (1968-08-01), Basehore et al.
patent: 4222111 (1980-09-01), Sloan et al.
patent: 4278870 (1981-07-01), Carleton et al.
patent: 4311990 (1982-01-01), Burke
VCL Audio
Westin Edward P.
Wieland Charles F.
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