Microfilm reader/printer
US4174891A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 6, 1978 |
| Grant date | Nov 20, 1979 |
| Priority date | — |
| Expiry date | Sep 6, 1998 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03B21/118
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A microprocessor controlled microfilm reader/printer is arranged to transport a roll of film having all images contained thereon, in a distinctive format involving sequentially recorded photographic areas. The reader/printer has an automatic call feature up, so that any given photographic area may be selected and projected responsive to the push of a button, the operation of a rotary switch, or both. A special bar code printed along an edge of the film eliminates the need for precise control over a film transport synchronized with a code reading speed. The bar code is preferably read by an optical electronic sensor, which provides a film positioning input control signal to enable an accurate locating of a selected photographic area within a viewing area.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.