Photographic still camera film system
US4488796A · kind A · utility
Inventor
Key dates
| Filing date | Apr 25, 1983 |
| Grant date | Dec 18, 1984 |
| Priority date | — |
| Expiry date | Apr 25, 2003 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03B2217/268
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A photographic still camera film system 10 uses a paper backed film strip 11 wound in a supply coil 20 with a leading end of the paper backing 12 attached to a take-up spindle 31 in a take-up container 30. A pair of axially interconnected end flanges 21 engage the ends of supply coil 20 with resilient material 22 carried on their inner faces. Resilient material 22 keeps the convolutions of supply coil 20 light tight. A rotatable hub supported on flanges 21 engages the inside of supply coil 20 to allow the supply coil to rotate relative to the flanges as the supply coil is unwound. The frictional engagement of resilient material 22 with the ends of supply coil 20 effectively prevents clock springing of the supply coil as it is unwound. A gear 46 arranged on take-up container 30 turns take-up spindle 31 to advance paper backed film strip 11 from supply coil 20 to take-up container 30.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.