Phototransistor apparatus with current injection ambient compens

Details Phototransistor apparatus with current injection ambient compens Phototransistor apparatus with current injection ambient compens

1986-02-18

1987-12-15

Westin, Edward P.

Radiant energy

Photocells; circuits and apparatus

Photocell controlled circuit

307311, H01J 4014

Patent

active

047135344

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: 3764813 (1973-10-01), Clement et al.
patent: 3811046 (1974-05-01), Levick
patent: 3970846 (1976-07-01), Schofield, Jr. et al.
patent: 4128760 (1978-12-01), Del Signore
patent: 4198623 (1980-04-01), Misek et al.
patent: 4243879 (1981-01-01), Caroll et al.
patent: 4247767 (1981-01-01), O'Brien et al.
patent: 4267443 (1981-05-01), Carroll et al.

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