Self-timer
US4079398A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 11, 1975 |
| Grant date | Mar 14, 1978 |
| Priority date | — |
| Expiry date | Jul 11, 1995 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03B9/64
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A self-timer for cinecameras wherein an electric delay circuit is used for detecting a length of time from the release to the commencement of a photographing process which takes place with an electric power having been actually supplied to a film feeding motor. The amount of the rotation made by the film feeding motor from the start of the rotation of the motor is either mechanically or electrically detected. When the detected amount of rotation reaches a preset value corresponding to a number of frames of the film required for self-timer photographing, the motor is stopped to terminate the photographing operation, so that the photographing operation with the self-timer can be accomplished exactly for a preset number of frames.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.