Anamorphic enlarging system
US3998545A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Mar 26, 1975 |
| Grant date | Dec 21, 1976 |
| Priority date | — |
| Expiry date | Mar 26, 1995 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03B27/68
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
The enlarging system includes a projection housing for receiving a negative film insert device supporting an anamorphic negative film image which is projected towards a working surface. Below the insert device is a projection lens, lens adapter, anamorphic lens secured in the adapter, and a dioptor lens. A light bellows connects between the projection lens and the negative film insert device. A first adjustment is used to vary the distance of the entire projection housing and lens system towards and away from the working surface. A second adjustment, in turn, varies the distance of the lens system from the negative film insert device. The dioptor in combination with the anamorphic lens permits a selected format size for the enlarged print to be chosen, the first adjustment matching perfectly the projected image with the selected format. The second adjustment brings the image into a fine focus.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.