Dot printer for reproduction of halftone images
US4394662A · kind A · utility
26Cited by
7References
21Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jul 30, 1981 |
| Grant date | Jul 19, 1983 |
| Priority date | — |
| Expiry date | Jul 30, 2001 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N1/4051
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
To overcome the tendency of the recording head of a dot printer to become inoperative in a range below a threshold level, a gray scale input signal is modulated with an oscillating signal so that the modulated signal oscillates above and below the threshold level to reproduce halftone values below the otherwise inoperative range.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.