Exposure control device
US4103307A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 23, 1977 |
| Grant date | Jul 25, 1978 |
| Priority date | — |
| Expiry date | May 23, 1997 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03B7/097
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
An automatic exposure control device to convert the analogue value of an object to be photographed, to digital value for controlling appropriate exposure value using said digital value. The device has a photo-sensing means to sense the light from the object digitally, a photographing information setting means to digitally set various photographing information such as film sensitivity, diaphragm aperture value, shutter speed, etc., a calculating means to digitally calculate diaphragm aperture value, shutter speed value means corresponding to the output of the above mentioned photo-sensing means and the photographing information setting means, a function detecting and setting means to detect and set each functional state, and a sequence control means having an instructional function for various calculating operations to control sequence-wise the computation operation of the above mentioned computation device, corresponding to the output of said function detecting and setting means, wherein the sequence control means determines the photographing mode corresponding to the output of the above mentioned function detecting and setting means. At the same time, appropriate exposure value is…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.