Indicating device for motion picture camera
US4105310A · kind A · utility
7Cited by
3References
8Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Dec 6, 1976 |
| Grant date | Aug 8, 1978 |
| Priority date | — |
| Expiry date | Dec 6, 1996 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03B1/60
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
An indicating lamp disposed on a camera housing so as to be observed by a person to be photographed is energized in two different modes respectively before and after a film has been exhausted or nearly completely used. A power-supplying circuit for energizing the indicating lamp includes first and second switches connected in parallel with each other for supplying electric power to the indicating lamp. The first switch is repeatedly closed and opened due to the operation of the motion picture camera while the second switch is opened or closed immediately before the film is exhausted or nearly completely used.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.