Image recording apparatus using optical beam for applying a tran

Details Image recording apparatus using optical beam for applying a tran Image recording apparatus using optical beam for applying a tran

1995-02-01

1999-08-24

Le, N.

Incremental printing of symbolic information

Electric marking apparatus or processes

Electrostatic

347125, 347158, B41J 2385, B41J 2415, G03G 908

Patent

active

059430826

ABSTRACT:
In a laser beam printer, automatic optical quantity (APC) control is performed based on an optical quantity detection output to generate a laser beam having a predetermined quantity of light. In each scanning cycle, APC is effected by utilizing a period (unblanking period) in which the laser device is forcibly actuated to generate a horizontal synchronization signal. The unblanking period may be changed according to the print paper size or image formation
on-image-formation periods. Also, light quantity control may be effected through a plurality of scanning cycles before image formation and may be effected by utilizing the unblanking period during the period corresponding to the intervals of print sheets. Techniques also provided to prevent a transfer unit from being contaminated by toner images formed as a byproduct of APC.

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