Photoplastic film recording and monitoring apparatus
US4286864A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 31, 1980 |
| Grant date | Sep 1, 1981 |
| Priority date | — |
| Expiry date | Jan 31, 2000 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03G16/00
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A photoplastic film recording and monitoring apparatus has a rotatable mirror which in one position establishes a first optical path from a copy holding station through an objective lens to an image plane where a platen is provided for supporting a transmissively readable fiche of photoplastic film. In a second position of the rotatable mirror a second optical path is established from a projection light source through the image plane and the objective lens onto a viewing screen. In one embodiment a lens turret has a plurality of lenses of different focal lengths for providing different magnification ratios in order to photograph different size original copy. System controls are provided for automatically reverting to that one of the lenses which affords full screen projection of the image from the fiche frame onto the viewing screen regardless of the reduction ratio chosen for photocopying. Manual focusing adjustment is afforded only in the monitor mode and such adjustment is disengaged in the photocopying mode. The hot block for developing images in the various frames of the fiche is arranged to function as a valve for developing a vacuum on the underside of the fiche when the hot…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.