Laser recorder reproducing a picture having half-tones of high accuracy
US4384297A · kind A · utility
15Cited by
2References
8Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Apr 29, 1981 |
| Grant date | May 17, 1983 |
| Priority date | — |
| Expiry date | Apr 29, 2001 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N1/4056
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A laser recorder in which pictures with gradations at equal density intervals are reproduced with a high accuracy. An input analog video signal is sampled with a sampling pulse at a predetermined sampling rate. For each value of the sampled input signal, a number of high frequency pulses are outputted to modulate a semiconductor laser. The high frequency pulses are outputted so as to be distributed substantially in equal numbers on either side of the center of each sampling period.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.