Self Adjusting Optical Document Sensors
Original Publication Date: 1980-Dec-01
Included in the Prior Art Database: 2005-Feb-14
This system automatically compensates for dust buildup and the different amplification factors of unmatched light-emitting diodes and photo transistors. Compensation is accomplished by frequently and automatically adjusting the LED output using a plurality of counters and D to A converters. Adjustment is initiated following initial program load and at any time from the operator's console.