Electronically controlled microfilm photographic image utilization device
US4110020A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 3, 1976 |
| Grant date | Aug 29, 1978 |
| Priority date | — |
| Expiry date | Aug 3, 1996 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03B21/11
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
An electronically controlled photographic image utilization device is arranged to transport a roll of microfilm having all images printed thereon in separate photographic areas, each area being arranged in a microfiche-type format. The photographic image utilization device has an automatic call-up feature 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 is printed along the edge of the film and used in conjunction with a closed loop film control system to eliminate the need for precise, clock controlled synchronization between the film transport and the code reading. Preferably, the bar code is read by optical electronic sensors. Responsive thereto, the electronic control system accurately positions a selected photographic image, on the microfilm, within a viewing area. Thereafter, and while the film transport is being held stationary, any image on the microfilm may be selected for projection by a manual movement of a simple lens positioning mechanism which is small, compact, and easily moved. The reader may also be operated manually so that the automatic controls may b…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.