Optical detection apparatus for detecting light interruption

Details Optical detection apparatus for detecting light interruption Optical detection apparatus for detecting light interruption

1996-04-23

1997-12-16

Evans, F. L.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

250214B, G02F 100

Patent

active

056988451

ABSTRACT:
The light selected by a selection circuit 3 at a light emitting side and emitted from a light emitting element 1 such as a LED is converted to a specifically modulated light by an oscillation circuit 11. The light received by a light receiving element 2 such as a phototransistor at the receiving side is amplified by an amplifier circuit 6, and a detection circuit 12 detects whether a specifically modulated light is received. The H/L detection circuit 13 determines the presence/absence of a light interruption to produce a signal of either H (high level) or L (low level). Also, the signal from the oscillator 11 of the emission side is received by the receiving side and compared with the received signal to determine whether the same signal as emitted from the emitting element has been actually received.

REFERENCES:
patent: 5164714 (1992-11-01), Wehrer
patent: 5179369 (1993-01-01), Person et al.

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