Photoelectric sensor having a folded light path

Details Photoelectric sensor having a folded light path Photoelectric sensor having a folded light path

1989-07-18

1990-12-18

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

350444, H01J 314

Patent

active

049788434

ABSTRACT:
A photoelectric sensor comprises a thin plate-shaped optical body, a circuit block and a tubular casing for incorporating therein the optical body and the circuit block. A signal light incoming through a transparent protector of the casing is reflected upon a first reflective mirror of the optical body. Following this first reflection, a second reflection is made upon a second reflective mirror thereof. The light having passed through a light collecting 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: 4554448 (1985-11-01), Sillitto
patent: 4566763 (1986-01-01), Greguss
patent: 4880974 (1989-11-01), Yamakawa

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