Camera for use with film-use-state indicating film cartridge
US5539484A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jun 7, 1995 |
| Grant date | Jul 23, 1996 |
| Priority date | — |
| Expiry date | Jun 7, 2015 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03B2217/266
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A camera of this invention can load a film cartridge, and has a spool around which a film is wound, a case for rotatably storing the spool, and an indicator for discriminatively indicating a use state of a film according to a rotational angular position of the spool. The camera has a spool drive, which can be engaged with the spool of the loaded cartridge at a predetermined rotational angular position, and can rotate the spool upon engagement, a first drive control for controlling the spool drive so as to rotate the spool to an angular position where the indicator indicates a used state of the film after the film is rewound, and an unloading detector for detecting an unloading operation of the film cartridge from the camera. The camera also has a second drive control for controlling the spool drive to assume an angular position where the spool drive can be engaged with the spool of the film cartridge on which a film unused state is indicated after the unloading operation of the film cartridge is detected.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.