Color image reading apparatus with two color separation filters each having two filter elements
US4827335A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 21, 1987 |
| Grant date | May 2, 1989 |
| Priority date | — |
| Expiry date | Aug 21, 2007 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N1/482
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A color reading apparatus having a document table upon which the documents to be read are placed. The document table is formed of transparent glass which is illuminated by a light source, the light source being driven by a light source driver. An image of a document to be read is focused on an image sensor through a focusing lens and through first and second color separation filters. Each of the color separation filters have first and second filter elements which are formed on a transparent substrate and are aligned in the direction from which a photosensor array of the image sensor performs scanning. The image sensor is driven by a CCD driver and generates an image signal corresponding to the focused image. The CCD driver is controlled by a control circuit which is connected to a reference clock. The image signal output from the image sensor is amplified by an amplifier and converted to a digital signal by an A/D converter. The digital signal is then supplied to an image signal processing circuit. The two color separation filters are periodically moved such that the four filter elements are inserted between the lens and the image sensor in various combinations of two filter elemen…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.