Light beam scanning apparatus
US6496212B1 · kind B1 · utility
Assignees
Inventors
Key dates
| Filing date | Dec 15, 1999 |
| Grant date | Dec 17, 2002 |
| Priority date | — |
| Expiry date | Dec 15, 2019 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N2201/04794
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A light beam position detecting device detects the passage positions of a plurality of light beams for scanning the surface of a photosensitive drum. The light beam position detecting device has a sensor pattern for generating an output which is continuously changed in a wide range with a variation in the passage position of the light beam in a sub-scanning direction perpendicular to a main scanning direction of the light beam. The sensor pattern precisely detects the relative scanning position of the light beam in a wide range. The passage positions of the plurality of light beams for scanning the surface of the photosensitive drum are controlled to a preset position based on the output of the sensor pattern.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.