Camera with film take-up confirming mechanism
US5166715A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | May 13, 1991 |
| Grant date | Nov 24, 1992 |
| Priority date | — |
| Expiry date | May 13, 2011 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03B17/425
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
In a camera, a film presence sensing switch is located to detect the beginning of a full width main section of a filmstrip after a reduced width leading section of the filmstrip is wound at least partly onto a take-up spool. When a sufficient time has elapsed during the film winding operation for the reduced width section of the filmstrip to be wound onto the take-up spool, a motor drive for rotating the spool in a winding direction is de-energized should the switch fail to detect the beginning of the full width section of the filmstrip. Alternatively, the motor drive is allowed to remain energized to continue the film winding operation should the switch detect the beginning of the full width section.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.