Patent US3633476A successfully refreshed from Google Patents.
US3633476A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Autoflash switching device for camera
Assignee: Canon Inc
•
Filing: 1969-05-01
•
Granted: 1972-01-11
•
Expires: 1989-05-01
Abstract
Abstract An autoflash switching system and device for use in automatic photoelectric exposure control cameras (EE cameras) wherein the camera is automatically switched from its autophotography position to its flashphotography position upon attachment of a flashgun to an accessory shoe.
Inventors
- 👤 Mutsunobu Yazaki
- 👤 Takashi Uchiyama
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 07:22
CPC Classifications
G; G03; G03B; G03B7/00; G03B7/16
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
179 words
A system providing automatic flash photography exposure control for a camera comprising, in combination, a flashgun receptor including a conductive member connected to the camera housing, an exposure control cIrcuit including a photoconductor and a resistor variably settable in accordance with camera focusing, first terminals of said photoconductor and said resistor being connected together, first and second contact elements insulatively supported in said conductive member, said first contact element being connected to the resistor second terminal and said second contact element being connected to said camera housing through the camera shutter flash contacts, said conductive member being connected to the photoconductor second terminal, said flashgun including a power supply, a flashbulb filament and a conductive base insulatively supporting third and fourth contact elements, said conductive base being matable with said receptor conductive member for providing engagement of said first and third contact elements and engagement of said second and fourth contact elements, said power supply and said filament being series connected between said fourth contact element and said conductive base, said third contact being connected to said conductive base.
Claim 2
Independent Claim
179 words
A system providing automatic flash photography exposure control for a camera comprising, in combination, a flashgun receptor including a conductive member connected to the camera housing, an exposure control cIrcuit including a photoconductor and a resistor variably settable in accordance with camera focusing, first terminals of said photoconductor and said resistor being connected together, first and second contact elements insulatively supported in said conductive member, said first contact element being connected to the resistor second terminal and said second contact element being connected to said camera housing through the camera shutter flash contacts, said conductive member being connected to the photoconductor second terminal, said flashgun including a power supply, a flashbulb filament and a conductive base insulatively supporting third and fourth contact elements, said conductive base being matable with said receptor conductive member for providing engagement of said first and third contact elements and engagement of said second and fourth contact elements, said power supply and said filament being series connected between said fourth contact element and said conductive base, said third contact being connected to said conductive base.
Claim 3
Dependent Claim
41 words
The system claimed in claim 1 wherein said exposure control circuit comprises a series circuit including said photoconductor, an ammeter and a battery and a further resistor variably settable in accordance with film sensitivity and connected in parallel with said ammeter.
Claim 4
Dependent Claim
18 words
The system claimed in claim 1 wherein said third contact element is connected directly to said conductive base.
Claim 5
Dependent Claim
20 words
The system claimed in claim 1 wherein said third contact element is connected to said conductive base through said filament.
References Cited (Backward Citations)
US3406619A
Cited
US3498192A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-01-10 | 1975-07-12 | 1976-01-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-01-10 | 1979-07-12 | 1980-01-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-01-10 | 1983-07-12 | 1984-01-11 | $7700.00 | Window Closed / Lapsed |