Patent US4305649A successfully refreshed from Google Patents.
US4305649A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Inhibit circuit for an electronic flash charge circuit
Assignee: Seiko Koki KK
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Filing: 1980-04-25
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Granted: 1981-12-15
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Expires: 2000-04-25
Abstract
Abstract In a camera of the type including an electronic flash light unit with an oscillating circuit and an electronic shutter which are both supplied with power from a common power supply, an inhibit circuit for an electric flash charge circuit is provided in which a base of the transistor in the oscillating circuit is connected to the output terminal of the exposure control circuit via a semi-conductor switching element. The semi-conductor switching element stops oscillation in the electric flash charge circuit while the exposure control circuit is in operation.
Inventors
- 👤 Shinji Nagaoka
- 👤 Yuzuru Takazawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 14:58
CPC Classifications
G; G03; G03B; G03B15/00; G03B15/02; G03B15/03; G03B15/05; G03B2215/00; G03B2215/05
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
101 words
In a camera control circuit including an electro-magnet for controlling the exposure completion time, an exposure control circuit having a shutter control circuit for controlling the electro-magnet, an electric flash circuit having an oscillation transistor forming an oscillation circuit, and a power supply to be applied in common with said exposure control circuit and said electric flash circuit, the improvement comprising: a semi-conductor switching means arranged between the output terminal of the shutter control circuit for controlling said electro-magnet and the base of said oscillation transistor for keeping said oscillation transistor inoperative during the time in which said electro-magnet is energized.
Claim 2
Dependent Claim
101 words
In a camera control circuit including an electro-magnet for controlling the exposure completion time, an exposure control circuit having a shutter control circuit for controlling the electro-magnet, an electric flash circuit having an oscillation transistor forming an oscillation circuit, and a power supply to be applied in common with said exposure control circuit and said electric flash circuit, the improvement comprising: a semi-conductor switching means arranged between the output terminal of the shutter control circuit for controlling said electro-magnet and the base of said oscillation transistor for keeping said oscillation transistor inoperative during the time in which said electro-magnet is energized.
Claim 3
Dependent Claim
18 words
A camera control circuit as set forth in claim 1; wherein said semi-conductor switching means comprises a diode.
Claim 4
Dependent Claim
18 words
A camera control circuit as set forth in claim 1; wherein said semi-conductor switching means comprises a transistor.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-12-14 | 1985-06-15 | 1985-12-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-12-14 | 1989-06-15 | 1989-12-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-12-14 | 1993-06-15 | 1993-12-15 | $7700.00 | Window Closed / Lapsed |