Apparatus and method for jet drop copying with an array of jets and photodetectors
US4259696A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 12, 1979 |
| Grant date | Mar 31, 1981 |
| Priority date | — |
| Expiry date | Sep 12, 1999 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N1/1912
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A jet drop copying apparatus has a print head which directs a row of jets toward a print sheet mounted on a rotating drum. The row of jets extend substantially across the full width of the print sheet and are operated under control of a printing controller to print a series of tracks extending circumferentially along the sheet. The jets are shifted laterally in synchronism with the drum rotation such that each jet is moved a distance equal to the width of one printing track during one rotation of the drum. The shifting continues until a solid print has been obtained. An illumination device is provided for illuminating a narrow strip extending across a document to be copied and projecting an image of the illuminated strip upon a row of photodetectors. Longitudinal image scanning proceeds in synchronism with the rotation of the printing drum, and there is a lateral shifting of the image in synchronism with the shifting of the jet printing tracks.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.