Image recording apparatus using optical beam

Details Image recording apparatus using optical beam Image recording apparatus using optical beam

1994-06-01

1995-10-31

Blankenship, Howard B.

Incremental printing of symbolic information

Electric marking apparatus or processes

Electrostatic

358298, 358300, 358302, 372 29, 347246, G01D 942

Patent

active

054634105

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.

REFERENCES:
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patent: 4513300 (1985-04-01), Tatsuno et al.
patent: 4640606 (1987-02-01), Inamoto
patent: 4695714 (1987-09-01), Kimizuka et al.
patent: 4712118 (1987-12-01), Seto et al.
patent: 4812861 (1989-03-01), Sasaki et al.
patent: 4908634 (1990-03-01), Arimoto et al.
patent: 5043745 (1991-08-01), Inoue et al.

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