Electronic shutter for automatic exposure control
Abstract
Abstract DURING AN INITIAL INCREMENT OF MOVEMENT OF THE OPERATING MEMBER OF AN ELECTRONIC SHUTTER AND BEFORE AN EXPOSURE STARTS, AN ELECTRIC CIRCUIT SENSES THE BRIGHTNESS OF THE SUBJECT TO BE PHOTOGRTAPHED. IF THE BRIGHTNESS OF THE SUBJECT IS TOO HIGH OR TOO LOW FOR SATISFACTORILY TAKING A PICTURE WITH THE APERTURE THAT HAS BEEN SELECTED, FURTHER MOVEMENT OF THE OPERATING MEMBER IS BLOCKED AND A CORRESPONDING LAMP IS LIGHTED TO INDICATE EXCESSIVE OR INSUFFICIENT BRIGHTNESS. IF THE BRIGHTNESS IS WITHIN ALLOWABLE LIMITS, MOVEMENT OF THE OPERATING MEMBER IS PERMITTED TO PROCEED TO MAKE AN EXPOSURE AND A CHANGEOVER SWITCH OPERATED BY THE OPERATING MEMBER RECONSTITUTES THE CIRCUIT AS A TIMING CIRCUIT TO CONTROL THE EXPOSURE TIME ACCORDING TO THE BRIGHTNESS OF THE SUBJECT.
Inventors
- 👤 Kiyoshi Kitai
Bibliographic Details
Claims Analysis
Total Claims: 0References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-09-19 | 1975-03-21 | 1975-09-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-09-19 | 1979-03-21 | 1979-09-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-09-19 | 1983-03-21 | 1983-09-20 | $7700.00 | Window Closed / Lapsed |