Apparatus for wobble correction using an agile beam polygon ROS and all-spherical optics
US5498869A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 1, 1995 |
| Grant date | Mar 12, 1996 |
| Priority date | — |
| Expiry date | Jun 1, 2015 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N2201/04794
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
Facet-to-facet pyramidal wobble is corrected without resorting to cylindrical optics by adapting agile beam concepts to provide real-time control of the light beam position on the photoreceptor. The agile beam is provided by either or both of a variable wavelength light source or a variable index of refraction prism. The position of the light beam is determined by either or both of a super linear position detector directly detecting the position of the light beam, or a facet detector and a look-up table for indirectly estimating the position of the light beam. By actively compensating for pyramidal wobble, the passive but expensive and difficult-to-position cylindrical optics can be replaced with cheap and easy-to-position spherical optics.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.