Coded data generation or conversion – Digital pattern reading type converter – For x or y coordinate determination
Patent
1987-08-06
1989-01-17
Caldwell, Sr., John W.
Coded data generation or conversion
Digital pattern reading type converter
For x or y coordinate determination
340712, 250214B, 250221, 341 31, G08C 2100
Patent
active
047990449
ABSTRACT:
A current injection compensation circuit for dynamically compensating for the effect of ambient conditions on phototransistor output is disclosed. An output voltage is maintained at a nominal reference voltage level independent of ambient light input to allow use of a large output for a detected signal. Phototransistor current is a function only of ambient conditions, especially incident ambient light and is unaffected by compensation current injection. The ambient compensation current injection network can be employed with interactive touch input devices, such as infrared touch entry systems used with video displays.
REFERENCES:
patent: 4128760 (1978-12-01), Del Signore, II
patent: 4198623 (1980-04-01), Misek et al.
patent: 4341956 (1982-07-01), Bax
patent: 4591710 (1986-05-01), Komadina et al.
patent: 4701609 (1987-10-01), Koishi et al.
patent: 4707689 (1987-11-01), DiPiazza et al.
"Automatic Ambient Light & Dark Current Compensation of Photosensor", Chien et al, IBM Tech. Dis. Bulletin, 10/77.
Masters Timothy E.
Wehrer Wayne J.
AMP Incorporated
Caldwell Sr. John W.
Pitts Robert W.
Queen Tyrone
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