Image reading device with protective layers
US5017988A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 5, 1990 |
| Grant date | May 21, 1991 |
| Priority date | — |
| Expiry date | Feb 5, 2010 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH10F39/191
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An image reading device has an entrance window provided in a substrate for receiving the light illuminating an information bearing member bearing information to be read. A photosensor is provided on the substrate for receiving the light that has entered through the entrance window and has been reflected by the information bearing member. Further, a protective layer is formed on the photosensor opposite to the substrate, in order to maintain a constant distance between the information bearing member and the photosensor, and has a multi-layer structure of separate functions, comprising a first layer of a first function at the side of the photosensor, and a second layer of another function different from the first function.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.