Half tone laser recording apparatus
US5392060A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jul 31, 1992 |
| Grant date | Feb 21, 1995 |
| Priority date | — |
| Expiry date | Jul 31, 2012 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB41J2/52
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
A laser recording recording apparatus including a semiconductor laser as a light source and enabling half-tone recording. The apparatus includes a recording medium moving in a sub-scanning direction, M semiconductor lasers arranged along the sub-scanning direction at a slight distance to one another and enabled to be independently modulated according to image signals, where M is an integral number of at least two, a deflector for deflecting M laser beams emitted from the M semiconductor lasers toward the recording medium and for scanning the beams in a main scanning direction, and an image forming optical system for imaging the deflected laser beams at a predetermined distance between one another along the sub-scanning direction. An exposure pattern on the recording medium is represented by a pixel matrix comprising N.times.L micro pixels, where N is the number of micro pixels with respect to said main scanning direction and L is the number of micro pixels with respect to the sub-scanning direction, and the exposure pattern is varied according to a density information included in the image signal thereby to record half-tone, where L is an integral number of times M.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.