Input device controller

Details Input device controller Input device controller

1995-04-18

1997-04-22

Bayerl, Raymond J.

Computer graphics processing and selective visual display system

Display peripheral interface input device

Cursor mark position control device

250200, 250206, 2502061, 250551, G08C 2100

Patent

active

056232845

ABSTRACT:
The present invention is related to an input device controller having a photo coupler generating an induced current in response to a received quantum of light and using multi-stage, e.g. three-stage, dynamic impedances as an impedance match to obtain better frequency response and accurate identification of light-pass/light-shield state of the photo coupler. It also related to an input device controller using a reference voltage supply circuit including a constant current generator and an equivalent circuit to avoid the bad effect on the cursor shift control caused by the variation of the reference voltage.

REFERENCES:
patent: 4807166 (1989-02-01), Zalenski
patent: 5418381 (1995-05-01), Aizawa

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