Registry adjusting device for laser beam printer

Details Registry adjusting device for laser beam printer Registry adjusting device for laser beam printer

1999-07-30

2000-12-12

Yockey, David F.

Incremental printing of symbolic information

Light or beam marking apparatus or processes

Scan of light

B41J 247

Patent

active

061605662

ABSTRACT:
A phase-difference-measuring-circuit counts time-lags of beam-detect-signals with regard to a reference beam-detect-signal based on a reference clock. The counted values are stored in respective registers. When register-load-signals are set to "active", the stored values are loaded to pulse-generating-circuits, and counters in the pulse-generating-circuits count down the stored values based on the reference clock. During this count down operation, pulse-generating-circuits output one-shot-pulse-signals. When the on-shot-pulse-signals stays active, frequency dividers are set to "disable" and stop their operations. Duties of motor clocks driving rotary polygons in laser-beam-scanning-units are temporarily varied during this period, and the motor clocks are outputted with phase delay corresponding to this period, thereby correcting phase deviation in the main scan direction of the polygons.

REFERENCES:
patent: 5764270 (1998-06-01), Kitagawa et al.

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