High resolution print bar system
US5166999A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 25, 1991 |
| Grant date | Nov 24, 1992 |
| Priority date | — |
| Expiry date | Oct 25, 2011 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N1/0455
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
The resolution of an LED print bar used in printing applications is modified by optically coupling the print bar, in a preferred embodiment, to a two row, square ended, reduction enlargement gradient index lens array. The lens array is modified to have a radiometric speed suitable for printing applications (f/3 or faster) with a total conjugate long enough to maintain optical quality at full field. In a preferred embodiment, a nominal 480 spi print bar is coupled to a modified 0.80X R/E lens array to provide a resolution in an image plane of 600 spi. Other embodiments are described which utilize a plurality of print bars with a combination of unity magnification gradient index lens array in conjunction with a modified R/E lens array.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.