US3631779A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electronic flash device for a camera
Assignee: Nikon Corp
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Filing: 1969-07-16
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Granted: 1972-01-04
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Expires: 1989-07-16
Abstract
Abstract A lamp device for indicating the completion of the charge in an electronic flash lamp unit having a synchro circuit connectable to a synchro-contact circuit in a camera. The device consists of a cable for picking up a voltage applied to both poles of the flash tube, through terminals thereof which are provided at the side of the electronic flash lamp unit. The indicating lamp may be built into an indicating lamp adapter or the camera body, for example, the view finder. A voltage adjusting device is provided between the indicating lamp and the terminals in such a manner that the adjusting device is connected to at least one terminal of the synchro circuit of the flash unit.
Inventors
- 👤 Kunihiko Hori
- 👤 Keno Okuno
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 05:12
CPC Classifications
G; G03; G03B; G03B15/00; G03B15/02; G03B15/03; G03B15/05; G03B2215/00; G03B2215/05; G03B2215/0514; G03B2215/056
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
242 words
An electronic flash device for a photographic camera comprising an electronic circuit in a flash lamp unit including a gaseous flash lamp, a main capacitor and electrical components for triggering said flash lamp, signal lamp means visibly situated within the camera for indicating that said flash lamp unit is ready for operation when the signal lamp means is illuminated; a flash synchronizing contact on the camera, a signal contact on the camera connected to said signal lamp means, a synchronizing cable for electrically connecting said synchronizing contact of the camera and said signal contact to said electronic circuit, a first plug unit being provided at one end of said synchronizing cable and having first contact means directly connectable to said synchronizing contact and second contact means directly connectable to said signal contact, said first contact means being connected to said triggering component in said flash lamp unit through two wires and said second contact means being connected to the positive side of said capacitor through a third wire, a second plug unit being provided at the other end of said synchronizing cable and having three contacts connectable to said three wires, said flash lamp unit having a plug socket for receiving said second plug unit, and said first plug unit further including means for mounting said first plug unit on an accessory shoe of the camera and a manually operable variable resistor for adjusting the voltage applied to said signal lamp means.
Claim 2
Dependent Claim
242 words
An electronic flash device for a photographic camera comprising an electronic circuit in a flash lamp unit including a gaseous flash lamp, a main capacitor and electrical components for triggering said flash lamp, signal lamp means visibly situated within the camera for indicating that said flash lamp unit is ready for operation when the signal lamp means is illuminated; a flash synchronizing contact on the camera, a signal contact on the camera connected to said signal lamp means, a synchronizing cable for electrically connecting said synchronizing contact of the camera and said signal contact to said electronic circuit, a first plug unit being provided at one end of said synchronizing cable and having first contact means directly connectable to said synchronizing contact and second contact means directly connectable to said signal contact, said first contact means being connected to said triggering component in said flash lamp unit through two wires and said second contact means being connected to the positive side of said capacitor through a third wire, a second plug unit being provided at the other end of said synchronizing cable and having three contacts connectable to said three wires, said flash lamp unit having a plug socket for receiving said second plug unit, and said first plug unit further including means for mounting said first plug unit on an accessory shoe of the camera and a manually operable variable resistor for adjusting the voltage applied to said signal lamp means.
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) | 1975-01-03 | 1975-07-05 | 1976-01-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-01-03 | 1979-07-05 | 1980-01-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-01-03 | 1983-07-05 | 1984-01-04 | $7700.00 | Window Closed / Lapsed |