Optical data recording circuit for a photographic camera
US5870639A · kind A · utility
2Cited by
17References
5Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Mar 20, 1997 |
| Grant date | Feb 9, 1999 |
| Priority date | — |
| Expiry date | Mar 20, 2017 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03B17/245
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
Data bits representing different aspect ratio formats of film image frames are optically recorded on photographic film by means of light emitting devices energized from the flash charge storage capacitor. The light emitting devices are driven by a constant current source control circuit, the control circuit and light emitting devices being coupled to the capacitor by the flash sync switch. Data bit format selection is achieved by either user operated light emitting device selection switches or by means of an optical bit forming mask having plural aperture selectable by means of a movable slide shutter.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.