Vertically scanning microfilm reader and reader printer
US4123699A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 23, 1977 |
| Grant date | Oct 31, 1978 |
| Priority date | — |
| Expiry date | Sep 23, 1997 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03B21/111
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
The inventive microfilm reader and reader-printer has a film gate which is anchored to the chassis of the reader or reader-printer and which is entirely separate from a light system, lens mount, and focusing system which float up and down with respect to the film gate and chassis. The floating system is mounted on an elevator mechanism which lifts or lowers it relative to the film gate to scan across the width of the film. A prism is included in the lens system to rotate and vertically align the projected image. A combination of the movements of the elevator mechanism and prism enables any vertical segment of the microfilm to be scanned, selected, and read in a vertical orientation.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.