Medium detecting system with automatic compensation for sensor v

Details Medium detecting system with automatic compensation for sensor v Medium detecting system with automatic compensation for sensor v

1989-08-29

1991-01-15

Westin, Edward P.

Radiant energy

Photocells; circuits and apparatus

With circuit for evaluating a web, strand, strip, or sheet

250556, 356 71, G01N 2186, G06K 900

Patent

active

049856367

ABSTRACT:
In a medium detecting system having a plurality of optical sensors, each including a light-emitting element and a light-receiving element whose current varies with the amount of light received, and a load resistance unit provided in common for the sensors, the resistance of the load resistance circuit can be varied in accordance with load resistance selecting data supplied thereto. A sensor selector is responsive to sensor selecting data for selecting one of the sensors and connecting the light-receiving element of the selected sensor to the load resistance unit. A rewritable memory stores the sensor selecting data and data used for selecting the load resistance.

REFERENCES:
patent: 4559452 (1985-12-01), Igaki et al.

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