Control systems for microfilm readers
US4339182A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 29, 1980 |
| Grant date | Jul 13, 1982 |
| Priority date | — |
| Expiry date | Oct 29, 2000 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06K17/0016
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A microfilm reader comprising a plurality of input keys for specifying the desired frame of a microfilm, drive assemblies for automatically transporting the microfilm in response to signals from input keys to bring the specified frame to the projecting position, and a control system. Upon the application of power to the control system or change of the magnification of projection, a signal output circuit emits signals equivalent to those produced when specific input keys are depressed, to transport the microfilm automatically to a predetermined position and bring a specified frame to the projecting position without striking any input key.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.