US3590703A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Set value indicating apparatus for single lens reflex camera
Assignee: Nikon Corp
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Filing: 1968-04-19
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Granted: 1971-07-06
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Expires: 1988-04-19
Abstract
Abstract A view finder for a single lens reflex camera is provided in which the exposure data such as shutter speed, lens aperture, distance and the like may be observed; provisions being made to record the data on the photograph. An aperture or window is provided in the camera body for illuminating the data dials. Two pivotable mirrors, a prism and a lens are provided to project an image of the dial data on the border portion of the focusing plate. Both pivotable mirrors are coupled to the shutter release button, the first mirror blocking the incoming light as an exposure is made, the second mirror tilting slightly at the same time. A lamp synchronized with the shutter release button flashing to provide the required light for recording data on the film by the tilted second mirror.
Inventors
- 👤 Shigeo Ono
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 01:07
CPC Classifications
G; G03; G03B; G03B17/00; G03B17/24; G03B17/245; G03B2217/00; G03B2217/24; G03B2217/242; G03B2217/243
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
200 words
A single lens reflex camera comprising, in combination, a view finder having an eyepiece, a shutter releasing member on the camera body, a viewing mirror movable between an exposure position and a viewing position in response to operation of said shutter releasing member, a focusing plate having an area restricted within field of view of said view finder for receiving light rays from the exit pupil of said camera objective and a transparent portion adjacent to said area, exposure condition indicating means arranged in the camera housing and having scale markings movable in cooperation with the exposure factor setting means of the camera, means for illuminating said indicating means, a scale indicating optical system provided in the camera housing for directing an image of said scale markings toward said transparent portion of said focusing plate through said viewing mirror, said viewing mirror deflecting respectively the light rays passing through said camera objective and the light rays passing through said scale indicating optical system into the focusing plane of said view finder when said mirror is in said viewing position, said transparent portion of the focusing plate being formed to refract said light rays from said scale markings toward said eyepiece.
Claim 2
Dependent Claim
200 words
A single lens reflex camera comprising, in combination, a view finder having an eyepiece, a shutter releasing member on the camera body, a viewing mirror movable between an exposure position and a viewing position in response to operation of said shutter releasing member, a focusing plate having an area restricted within field of view of said view finder for receiving light rays from the exit pupil of said camera objective and a transparent portion adjacent to said area, exposure condition indicating means arranged in the camera housing and having scale markings movable in cooperation with the exposure factor setting means of the camera, means for illuminating said indicating means, a scale indicating optical system provided in the camera housing for directing an image of said scale markings toward said transparent portion of said focusing plate through said viewing mirror, said viewing mirror deflecting respectively the light rays passing through said camera objective and the light rays passing through said scale indicating optical system into the focusing plane of said view finder when said mirror is in said viewing position, said transparent portion of the focusing plate being formed to refract said light rays from said scale markings toward said eyepiece.
Claim 3
Dependent Claim
74 words
A single lens reflex camera according to claim 1, wherein said illuminating means includes a window provided on the camera housing, and a hinged mirror movable by said shutter releasing member between a first position to direct the light rays from said window to said indicating means and a second position to shield said window, when said hinged mirror is located in said second position, said viewing mirror is moved toward said exposure position.
Claim 4
Dependent Claim
115 words
A single lens reflex camera according to claim 1, wherein said scale indicating optical means includes means for forming an image of said scale markings on said focuSing plate and a second pivoted mirror slightly moved by said shutter releasing member between a first position in which to direct the image of said scale marking onto said transparent portion of said focusing plate and a second position in which to direct the same image into the field of view of said view finder, when said second pivoted mirror is moved to said second position and said viewing mirror is located in said exposure position, the image of said scale marking is formed in the picture.
Claim 5
Dependent Claim
48 words
A single lens reflex camera according to claim 3 wherein, said illuminating means further includes an artificial light source provided in the camera housing for illuminating said scale markings when said second pivoted mirror is in its second position and the viewing mirror is in its exposure position.
Claim 6
Dependent Claim
157 words
Apparatus for indicating the set values of a single lens reflex camera, comprising exposure data indicating means interlocked with and set by settable mechanisms of the camera, an observation optical system for forming an image of said indicating means on the focusing screen within the viewfinder of the camera, an image forming optical system for the camera including an objective to project an image of the object to be photographed on the focusing screen of the viewfinder; the observation optical system being arranged to be optically separate from and outside of the effective exit pupil of the objective, means for illuminating said indicating means, said illuminating means includes means for artificially illuminating said data indicating means and means for accepting natural light for illuminating said data indicating means, and means interlocked with the shutter release mechanism of the camera for blocking the natural light and artificially illuminating said data indicating means upon release of the camera shutter.
Claim 7
Dependent Claim
157 words
Apparatus for indicating the set values of a single lens reflex camera, comprising exposure data indicating means interlocked with and set by settable mechanisms of the camera, an observation optical system for forming an image of said indicating means on the focusing screen within the viewfinder of the camera, an image forming optical system for the camera including an objective to project an image of the object to be photographed on the focusing screen of the viewfinder; the observation optical system being arranged to be optically separate from and outside of the effective exit pupil of the objective, means for illuminating said indicating means, said illuminating means includes means for artificially illuminating said data indicating means and means for accepting natural light for illuminating said data indicating means, and means interlocked with the shutter release mechanism of the camera for blocking the natural light and artificially illuminating said data indicating means upon release of the camera shutter.
References Cited (Backward Citations)
US3259039A
Cited
FR1381778A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-07-05 | 1975-01-04 | 1975-07-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-07-05 | 1979-01-04 | 1979-07-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-07-05 | 1983-01-04 | 1983-07-06 | $7700.00 | Window Closed / Lapsed |