Photoelectric sensor employing custom lens member

Details Photoelectric sensor employing custom lens member Photoelectric sensor employing custom lens member

1988-10-14

1989-11-14

Westin, Edward P.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

250239, 350444, H01J 314

Patent

active

048809748

ABSTRACT:
A photoelectric sensor comprises a thin plate-shaped optical body, a circuit block and a casing for incorporating therein the optical body and the circuit block. A nearly infrared light incoming through a front surface of the casing is reflected upon a first reflective surface of the optical body. Following this first reflection, a second reflection is made upon a second reflective surface thereof. The light having passed through a light collective lens is received by a photoelectric converting element and converted into electric signals for output. Since the optical body comprises a plurality of reflective surfaces, an optical path up to the photoelectric converting element can be incorporated compactly within the thin plate-shaped optical body.

REFERENCES:
patent: 3059113 (1962-10-01), McHenry
patent: 3897133 (1975-07-01), Warner et al.
patent: 4554448 (1985-11-01), Sillitto
patent: 4566763 (1986-01-01), Greguss
patent: 4808812 (1989-02-01), Tanaka et al.

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