Apparatus and method for generating images by producing light spots of different sizes
US4809021A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 12, 1988 |
| Grant date | Feb 28, 1989 |
| Priority date | — |
| Expiry date | Jan 12, 2008 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N2201/04794
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An electro-optical light scanning system using a modulated laser illumination source directed upon a multi-faceted rotating polygonal mirror or polygon. The mirrored facets reflect the impinging light toward a moving photoreceptor and forms a raster of scan lines as the photoreceptor moves to create dot images on the photoreceptor. The invention also encompasses amplitude modulation for varying the intensity of the laser illumination in conjunction with acousto-optical modulation for maintaining a constant level illumination and/or for varying dot size. Other embodiments describe producing dot size variation in an ink jet printer, a light emitting diode printer and a thermal printer.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.