Image forming apparatus, electron beam apparatus, modulation...

Computer graphics processing and selective visual display system – Display driving control circuitry – Intensity or color driving control

Reexamination Certificate

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Details

C345S077000, C345S089000, C345S208000

Reexamination Certificate

active

06947060

ABSTRACT:
An image forming apparatus which performs pulsewidth modulation with a pulsewidth set by counting a clock. Especially, for grayscale level correction by setting the frequency of the clock, the periodic clock is counted, and an output pattern is changed in accordance with a count value of the clock. Otherwise, information corresponding to a clock pattern is stored in advance, and the information is sequentially read and used as a clock. Otherwise, a clock source in which the frequency is controlled by a control signal is used.

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European Search Report (No. 2638130) dated Jun. 16, 1999.

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