Image forming apparatus

Details Image forming apparatus Image forming apparatus

1998-05-15

2000-04-11

Le, N.

Incremental printing of symbolic information

Light or beam marking apparatus or processes

Scan of light

347248, 347250, 347116, B41J 2435

Patent

active

060493518

ABSTRACT:
It is an object to stably form a color image of a high quality without a color deviation by completing a phase adjustment in a short time so that a reference signal of a main scanning control system and a reference signal of a sub scanning control system have a predetermined phase. To accomplish the object, an output timing of an ITOP signal which is generated by a sensor 9 which detects a predetermined position of a photosensitive drum 5 which is rotated is compared with an output timing of a virtual main scanning sync signal BD' of a polygon mirror 3 for scanning a light beam onto the photosensitive drum 5 in the main scanning direction, thereby deciding an output timing of a reference clock SP. On the basis of the decided output timing, a PLL circuit 116 controls a rotational speed of a polygon motor 117 so that a difference between the reference clock SP which is outputted by a counter 83 and the ITOP signal have a predetermined phase difference.

REFERENCES:
patent: 4580171 (1986-04-01), Arimoto
patent: 5331341 (1994-07-01), Egawa et al.
patent: 5424763 (1995-06-01), Komiya et al.
patent: 5673115 (1997-09-01), Arimoto
patent: 5724152 (1998-03-01), Hayashi et al.

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