Film information exchange system with virtual identification codes
US5194892A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Apr 16, 1991 |
| Grant date | Mar 16, 1993 |
| Priority date | — |
| Expiry date | Apr 16, 2011 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03B2217/244
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A virtually transparent magnetic layer is included as an additional layer in a photographic film. Information exchange between various users of the film, such as the film manufacturer, the camera user, the dealer and photofinisher, is carried via plural longitudinal magnetic tracks on the film, each track being dedicated to the writing and reading of a predetermined set of related parameters. The tracks are divided into data fields. A data field includes a virtual identification code and a plurality of sub-fields representative of different parameters. The virtual identification code serves as an address to corresponding stored instructions which identify and interpret the data in the corresponding sub-fields. Look-up tables addressed by said virtual identification codes can include bit-map instructions, state identifier instructions, and/or scaling algorithm instructions.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.