Apparatus for forming superimposed images
US4912491A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 19, 1988 |
| Grant date | Mar 27, 1990 |
| Priority date | — |
| Expiry date | May 19, 2008 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N2201/04794
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An image forming apparatus for forming superimposed images includes a plurality of image forming devices each for forming a different image and a registration mark, corresponding to the position of the associated image, on an image transferring medium. The registration mark is formed on a transparent part of the medium and is illuminated from below. A detector above the medium detects the position of the shadow of the registration mark for each image and the result of detection is used to adjust the position of at least one image forming device to produce proper registration between the images formed by the respective image forming devices.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.