Pulse width control circuit

Details Pulse width control circuit Pulse width control circuit

1985-12-16

1987-10-13

Heyman, John S.

Electrical pulse counters, pulse dividers, or shift registers: c

Applications

Control

377 39, 377 45, 377114, 377 43, 328 62, 328 71, 328105, H03K 515, G05B 1918

Patent

active

047003677

ABSTRACT:
A pulse width control circuit for providing a control signal to adjust variations of electrical characteristics among a plurality of printing elements has an up/down counter and a plurality of control signal generating circuits. The up/down counter counts the number of pulses of a clock signal and delivers the counted value. The control signal generating circuit compares the counted values from the up/down counter with set values corresponding to conduction time periods of the currents used for driving light emitting diodes, and generates a plurality of control pulse signals having pulse widths whose central positions thereof are in accord with each other.

REFERENCES:
patent: 3663938 (1972-05-01), Baer
patent: 3676650 (1972-07-01), Henegar
patent: 3930201 (1975-12-01), Ackermann et al.
patent: 4015493 (1977-04-01), Woolston

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