Sync contact switch for movie camera
US3945718A · kind A · utility
Inventor
Key dates
| Filing date | Jul 8, 1974 |
| Grant date | Mar 23, 1976 |
| Priority date | — |
| Expiry date | Jul 8, 1994 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03B31/04
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A switch adapted to cooperate with the pull-down claw of a silent movie camera for transmitting an electrical signal each time a frame of movie film is advanced past the shutter of the camera includes an insulating base adapted to be positioned within the film receiving compartment of a movie camera so as to fit around the film gate, the base having a grounding contact arm engaging the gate so as to be grounded through the camera and a contact finger insulated from the gate and disposed for intermittent engagement with the reciprocating pull-down claw which serves to close the switch each time a frame of film is advanced past the shutter.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.