Digital synthesizer, digital copier and magnification control unit
US6515767B1 · kind B1 · utility
Assignee
Inventor
Key dates
| Filing date | Jun 19, 2002 |
| Grant date | Feb 4, 2003 |
| Priority date | — |
| Expiry date | Jun 19, 2022 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N1/393
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
The digital synthesizer comprises a system control unit, a read control unit, and a write drive control unit, and based on a magnification fine adjustment value set using a magnification fine adjustment panel, in the copy mode, a magnification of an image in the main scanning direction is finely adjusted by controlling a write reference clock frequency for modulating a laser beam for image formation so that a desired pixel density is obtained and also a magnification of the image in the auxiliary scanning direction is finely adjusted by controlling a scan speed when reading an image from a document, while in the printer mode, a magnification of an image in the main scanning direction is finely adjusted by controlling a write reference clock frequency and also a magnification of the image in the auxiliary scanning direction is finely adjusted by controlling a rotational speed of a polygon mirror for scanning a photosensitive mirror with a write beam.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.