Optical encoder
US4219850A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Feb 16, 1978 |
| Grant date | Aug 26, 1980 |
| Priority date | — |
| Expiry date | Feb 16, 1998 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N1/19536
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An optical encoder for scanning a master image at scan points positioned in a plurality of parallel scan rows across the master image includes a means for illuminating the master image. A plurality of photoelectric scanning means, each such scanning means including a row of photoelectric transducers, provides electrical signals in dependence upon the amount of light striking the transducers. Light is directed from the master image by a focusing arrangement toward a first one of the photoelectric scanning means such that the first photoelectric scanning means receives light from an associated one of the scan rows on the master image. An optical diversion means includes one or more half silvered mirrors which divert a portion of the light directed toward the first photoelectric scanning means such that it strikes the others of the plurality of photoelectric scanning means whereby each of the scanning means receives light from an associated one of the plurality of scan rows on the master image.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.