Laser printer for printing a plurality of output-images sizes
US4651169A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Apr 2, 1985 |
| Grant date | Mar 17, 1987 |
| Priority date | — |
| Expiry date | Apr 2, 2005 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N1/393
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A multi-format laser printer is disclosed which uses a constantly rotating polygon to line scan an intensity modulated beam of laser light across an image zone. Optical means, which include a cylindrical mirror are provided for causing first and second beam spot sizes to be in focus at the image zone. The first beam spot size is selected to be in focus for a first range of line scan lengths and the second beam spot size is selected to be in focus for at least one predetermined line scan length not in such range. The line scan length in the first range is adjusted by changing the periodicity of modulation of the laser beam. The velocity of the photosensitive member is adjusted to change the length of the output image in the page scan direction.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.