Air-platen bearing
US4411503A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 23, 1978 |
| Grant date | Oct 25, 1983 |
| Priority date | — |
| Expiry date | May 23, 1998 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03B1/52
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A fluid bearing platen for a film gate structure contains a pair of cavities to which pressurized fluid, such as air, to be applied against the opposing surfaces of a photographic film, is supplied. Between each respective cavity and one side of the film there is disposed a thermodynamically non-throttling material, such as porous stainless steel, through which the pressurized fluid from the cavities passes, to be directed against the opposite sides of the film. The non-throttling material effectively creates an adiabatic transfer from the cavities to the film's opposing surfaces, thereby eliminating temperature loss and avoiding the wrinkling or warpage of the film.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.