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US3916424A Expired / Lapsed US ⏱️ 0.0 years remaining

Electronic flash device for photographic cameras

Assignee: Rollei Werke Franke und Heidecke GmbH and Co KG
•
Filing: 1973-10-09
•
Granted: 1975-10-28
•
Expires: 1993-10-09
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Abstract

Abstract A photographic camera of the type having provision for automatic exposure control (for automatically setting either the diaphragm aperture, or the shutter speed, or both, in accordance with the prevailing light as measured by an exposure meter) in combination with an electronic flash unit detachably mountable on and removable from the camera. In distinction to prior arrangements where the mounting of the flash unit on the camera served to disconnect the automatic exposure control of the camera and where the automatic exposure control could not be reactivated until the flash unit was removed from the camera, the present construction provides for de-activating and reactivating the automatic exposure control by operation of the on and off switch of the flash unit. It is the position of this switch, acting through a projection on the switch mechanism which extends through an opening into the camera body, which serves to activate or deactivate the automatic exposure control of the camera, and to control the setting of the diaphragm to the proper aperture for use with the flash unit, according to its guide number.

Inventors

  • 👤 Claus Prochnow

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-11-05 09:10
CPC Classifications
G; G03; G03B; G03B7/00; G03B7/16; G03B15/00; G03B15/02; G03B15/03; G03B15/05; G03B9/00; G03B9/70; G03B2215/00; G03B2215/05; G03B2215/0503

Claims Analysis

Total Claims: 6
Claim 1
Independent Claim 177 words
The combination of a photographic camera of the type having means for automatically setting a diaphragm aperture, an electronic flash unit detachably mounted on said camera, said unit having an on-off switch movable between an off position and an on position, a switching protuberance in said unit connected to said switch and movable from said unit, means forming an opening in said camera positioned to permit movement of said protuberance into said camera when said flash unit is mounted thereon, means responsive to movement Of said switch from off position to on position for moving said protuberance from said unit into said camera, and means within said camera and controlled by said protuberance for setting said diaphragm aperture to a value appropriate to the flash unit, said camera including a photoelectric exposure meter having a movable sensing pointer, means for setting the diaphragm aperture in accordance with the position of the pointer, and means for controlling the position of said pointer in response to the position of said protuberance when said switch is in the on position.
Claim 2
Dependent Claim 177 words
The combination of a photographic camera of the type having means for automatically setting a diaphragm aperture, an electronic flash unit detachably mounted on said camera, said unit having an on-off switch movable between an off position and an on position, a switching protuberance in said unit connected to said switch and movable from said unit, means forming an opening in said camera positioned to permit movement of said protuberance into said camera when said flash unit is mounted thereon, means responsive to movement Of said switch from off position to on position for moving said protuberance from said unit into said camera, and means within said camera and controlled by said protuberance for setting said diaphragm aperture to a value appropriate to the flash unit, said camera including a photoelectric exposure meter having a movable sensing pointer, means for setting the diaphragm aperture in accordance with the position of the pointer, and means for controlling the position of said pointer in response to the position of said protuberance when said switch is in the on position.
Claim 3
Dependent Claim 33 words
The combination as defined in claim 1, wherein said on-off switch is in the form of a slider switch and has a plurality of on positions individually associated with detent means (8, 16).
Claim 4
Dependent Claim 33 words
The combination as defined in claim 2, wherein each separate on position of said switch controls a different position of said sensing pointer and thereby determines a different value of the diaphragm aperture.
Claim 5
Dependent Claim 28 words
The combination as defined in claim 1, further comprising an intermediate lever (9) in the camera, operatively interposed between said switching protuberance (7) and said sensing pointer (12).
Claim 6
Dependent Claim 29 words
The combination as defined in claim 4, further comprising a return spring (10) tending to move said intermediate lever (9) out of the range of said sensing pointer (12).

References Cited (Backward Citations)

US3171337A Cited
US3273479A Cited
US3335650A Cited
US3318215A Cited
US3511144A Cited
US3633476A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1978-10-27 1979-04-28 1979-10-28 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1982-10-27 1983-04-28 1983-10-28 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1986-10-27 1987-04-28 1987-10-28 $7700.00 Window Closed / Lapsed

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