Image forming apparatus
US6049351A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 15, 1998 |
| Grant date | Apr 11, 2000 |
| Priority date | — |
| Expiry date | May 15, 2018 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B26/127
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.