Photographic cassette for manipulation and exposure of a light-sensitive sheet
US4788566A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | May 28, 1987 |
| Grant date | Nov 29, 1988 |
| Priority date | — |
| Expiry date | May 28, 2007 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03B17/32
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A cassette having a housing with an opening for the light to penetrate when exposing a film sheet, loaded into the cassette, and also for the entry and exit of the film sheet when loading and unloading the cassette. For gripping the edges of the film sheet, inserted into the cassette, there are movable retaining members, which can be moved into ineffective positions outside the contours of the opening of the housing, to facilitate the entry and exit of the film sheet in a direction perpendicular to its plane. When the retaining members are moved into their effective positions, a pressure plate under the influence of a spring forces the film sheet, to be loaded into the cassette, against the retaining members, whereby the film sheet is held planar. Externally accessible actuators interact in the manner of rams with both the pressure plate and the retaining members such that at times when moving the actuators from an inactive into an active position, the pressure plate is forced away from the retaining members and the retaining members are moved into their ineffective positions, and vice versa.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.