Laser type recording device
US4395766A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 9, 1980 |
| Grant date | Jul 26, 1983 |
| Priority date | — |
| Expiry date | Dec 9, 2000 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N1/4056
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A laser recording device adapted for use in a facsimile system in which a semiconductor laser is activated by a series of pulses the number of which is produced in accordance with an input signal. The input signal is sampled with a sampling pulse signal whereas the pulses applied to the semiconductor laser are produced at a frequency which is at least two orders of magnitude greater than the frequency of the pulses used to sample the input signal. The input signal is digitized and used to address a read-only memory which outputs a number of pulses in dependence upon the amplitude of the input signal. The output number of pulses may be logarithmically related to the magnitude of the input signal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.