Apparatus and method using non-contact light sensing with select

Details Apparatus and method using non-contact light sensing with select Apparatus and method using non-contact light sensing with select

1994-09-15

1997-11-25

Hofsass, Jeffery

Communications: electrical

Condition responsive indicating system

Specific condition

340630, 250554, G08B 2100

Patent

active

056917007

ABSTRACT:
A light detection apparatus includes a light detector using a photoelectric converter such as a photodiode. The light detector has a selective viewport that limits the field of view observed by the photoelectric converter. The photoelectric converter generates a current signal based on the light received through the selective viewport. Using current-mode amplification, a current amplifier generates an amplified current signal based on the current signal received from the photoelectric converter. A switch coupled to receive the amplified current signal from the current amplifier, generates an output signal based on the amplified current signal. The switch can be implemented to generate the output signal with predetermined logic levels compatible with a desired logic family.

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