Optical reader and light source used for the same
US5196950A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 31, 1989 |
| Grant date | Mar 23, 1993 |
| Priority date | — |
| Expiry date | Jul 31, 2009 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N1/04
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An optical reader includes a transport mechanism for transporting a document in a document transport direction. The transport mechanism includes a lower guide plate and an upper guide plate opposite to the lower guide plate so as to form a gap through which the document is transported. The lower guide plate has an opening window. A light source obliquely projects light along a projection optical axis onto the document through the opening window. A read element receives light reflected by the document and outputting an electrical signal corresponding to the received light. The read element has a read optical axis along which the light reflected by the document comes. The read optical axis and the projection optical axis intersect on the side of the upper guide plate outside of the gap.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.