Photoelectric switch with visible signal

Details Photoelectric switch with visible signal Photoelectric switch with visible signal

1980-02-15

1982-02-09

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

250229, G02B 514

Patent

active

043151477

ABSTRACT:
A two-position switch for the control of a load, e.g. of a channel selector of a television receiver, comprises a transparent or translucent pushbutton with a stem carrying an optical reflector, such as a prism with a metallized surface, in an opaque housing receiving proximal ends of two optical fibers or fiber bundles whose distal ends confront a light source and a photodetector, respectively. In one position, the reflector directs light from the source to an exposed face of the pushbutton as a signal visible to the user while cutting off the illumination of the photodetector; in the other position, the visible light signal disappears while the photodetector is irradiated to operate the load.

REFERENCES:
patent: 3544749 (1970-12-01), De Angelo
patent: 3787837 (1974-01-01), Allen et al.
patent: 4152699 (1979-05-01), Sachsse

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