Apparatus for forming a color image
US5266976A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 31, 1990 |
| Grant date | Nov 30, 1993 |
| Priority date | — |
| Expiry date | Oct 31, 2010 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S347/90
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A color image recording apparatus comprises edge detection device with image sensors for detecting longitudinal edges of electrostatic recording paper, and mark detection device for detecting registration marks formed at an equal pitch along the edges of the recording paper. Both edges are detected at a first pass thereof through the edge detection device, and the detected output is stored in a memory. During each of second and subsequent passes, detected data is compared with the initially stored data to correct for expansion and shrinkage of the recording paper. Oblique motion of the recording paper is detected from the timing difference between registration marks formed on opposite sides of the recording paper, which timing difference is used to change line recording timing. A single correction is periodically repeated and changed until completion of the correcting for oblique motion of the recording paper as well as expansion or shrinkage thereof, hence ensuring an exact positional coincidence of the individual color images.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.