Combined pulse-width and amplitude modulation of exposing laser beam for thermal dye transfer
US5874981A · kind A · utility
4Cited by
19References
8Claims
0Family size
Assignee
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Key dates
| Filing date | Dec 19, 1995 |
| Grant date | Feb 23, 1999 |
| Priority date | — |
| Expiry date | Dec 19, 2015 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N1/40031
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A laser thermal system that uses a dye donor produces a desired relationship of exposure to density by modifying the input current waveform supplied to the exposure source. The modification is a combination of amplitude modulation and pulse width modulation in an imagewise fashion. The efficiency and the speed of image formation is increased by bringing the dye donor temperature near the threshold of dye transfer using a segment of the total current waveform for a very short duration.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.