Multilevel image printing device
US4434431A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 10, 1981 |
| Grant date | Feb 28, 1984 |
| Priority date | — |
| Expiry date | Jun 10, 2001 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N1/40037
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A multilevel image printing device in which a laser beam is scanned onto the surface of a photoconductive drum with plural intensity levels without the use of a modulator. A multilevel image outputting circuit produces a multilevel signal which is applied to a multilevel image signal to laser beam conversion circuit which converts it into an intensity value for operating a semiconductor laser beam source. The multilevel image signal to laser beam conversion circuit includes plural switches which are operated in response to the multilevel image signal coupled through resistors of different values which determine the voltage applied to the semiconductor laser beam source.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.