Data recording photographic camera
US4493547A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Dec 27, 1983 |
| Grant date | Jan 15, 1985 |
| Priority date | — |
| Expiry date | Dec 27, 2003 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03B2217/243
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A data recording camera, which records information on unexposed film concomitant to taking a picture, uses a light source to record the information and for initiating a camera operation related to picture taking, such as firing an electronic flash. A photoelectric sensor in the camera, for example a phototransistor or a photodiode, responds to incident light from the light source and to the discontinuation of such light by undergoing respective electrical changes. A triggering element connected to the photoelectric sensor initiates the camera operation in response to the photoelectric sensor undergoing a particular one of its electrical changes. In the example of an electronic flash, a silicon controlled rectifier (SCR) is connected to the photoelectric sensor. The SCR renders the flash circuit conductive, to fire a flash tube in synchronization with opening of the camera shutter, in response to the photoelectric sensor undergoing an electrical change after the shutter uncovers the light source.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.