Apparatus and process for photographically duplicating intelligence existing on photoplastic film
US4147429A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jan 31, 1978 |
| Grant date | Apr 3, 1979 |
| Priority date | — |
| Expiry date | Jan 31, 1998 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03G16/00
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
Process and apparatus for duplicating on microfiche the intelligence appearing on a photoplastic microfiche master by irradiating the duplicate through the master with high intensity moderately collimated light. Photoplastic film having a relatively thick thermoplastic layer is used as the master. The master and the duplicate are separated by a gap of predetermined size, which gap can be filled by air, plastic, glass or any other transparent medium. Multiple light sources isolated from one another, are used and provision is made for absorbing and dissipating some of the heat before the light reaches the master. Means are provided for assuring relatively uniform light intensity across the entire recording face and for assuring consistent irradiation of the duplicate irrespective of lamp age or line voltage variations.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.