Proximity switch

Details Proximity switch Proximity switch

1995-11-21

1997-10-07

Westin, Edward P.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

2502221, 340555, G01D 534

Patent

active

056751435

ABSTRACT:
The use of a single concave mirror (1) serving as an optical focusing and directing element for a proximity switch allows an increased sensitivity at equal construction size or a substantial reduction in the construction size with equal sensitivity. In a preferred embodiment, the concave mirror is divided into two halves (3, 4) by a supporting plate (2) for the light source (5) and the light sensor (6), the halves (3, 4) of the mirror serving the purpose of directing the emitted light (8) and focusing the reflected light (9) onto the light sensor. In order to increase the resistance to difficult environmental conditions, the concave mirror (1) or its portions (3, 4) can be filled with a substance which is transparent to the light of the light source (5). Metallized plastics material is a suitable material for the mirror, especially in combination with the mentioned filling substance.

REFERENCES:
patent: 3603800 (1971-09-01), Andres
patent: 3886544 (1975-05-01), Narodny
patent: 4564756 (1986-01-01), Johnson
patent: 4814600 (1989-03-01), Bergstrom
patent: 5138150 (1992-08-01), Duncan
patent: 5397890 (1995-03-01), Schueler et al.
patent: 5449899 (1995-09-01), Wilson
Patent Abstracts of Japan, vol. 9, No. 246 (P-393) (1969) Oct. 3, 1985, JP Publication No. 60-98381.

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