US3873987A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Diaphragm shutter
Assignee: Eastman Kodak Co
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Filing: 1973-09-13
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Granted: 1975-03-25
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Expires: 1993-09-13
Abstract
Abstract A diaphragm shutter includes apertured diaphragm shutter blades mounted for movement from a minimum aperture position to a maximum aperture position through a sequence of delays provided by an inertial delay member located to be engaged by the diaphragm blades as the diaphragm shutter blades move from the minimum aperture position toward the maximum aperture position. The inertial delay member includes an escapement mechanism, engageable by one of the diaphragm shutter blades, which is selectively contoured at a position of engagement by the diaphragm shutter blade to provide for the sequence of delays in the opening of the diaphragm shutter movement. The diaphragm shutter blades are permitted to move unimpeded to a preselected aperture size before engagement with the escapement mechanism. Light responsive means operate to move the blades to form the minimum aperture size after an exposure aperture has been formed which permits proper exposure in relation to received light intensity.
Inventors
- 👤 Gerhard Brauning
- 👤 Wolfgang Ort
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 21:17
CPC Classifications
G; G03; G03B; G03B9/00; G03B9/58; G03B7/00; G03B7/08; G03B7/081; G03B7/085
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
169 words
In a camera, exposure control apparatus comprising: diaphragm means, mounted for movement to form an exposure aperture of varied size; means for retaining said diaphragm means in a position to form an aperture of minimum size; means for urging said diaphragm means toward a position to form an aperture of maximum size; means for releasing said diaphragm means to permit said urging means to move said diaphragm means toward said position to form said maximum aperture; inertial delay means, located to be engaged by said diaphragm means after an unimpeded moVement of said diaphragm means towards said position to form said maximum aperture and after an exposure aperture has been formed which would permit exposure, for retarding the opening of said diaphragm means between said minimum and maximum aperture sizes; and light responsive means for moving said diaphragm means to said position of minimum aperture after said diaphragm means has moved to form an aperture of a size which permits exposure in relation to the intensity of received light.
Claim 2
Dependent Claim
169 words
In a camera, exposure control apparatus comprising: diaphragm means, mounted for movement to form an exposure aperture of varied size; means for retaining said diaphragm means in a position to form an aperture of minimum size; means for urging said diaphragm means toward a position to form an aperture of maximum size; means for releasing said diaphragm means to permit said urging means to move said diaphragm means toward said position to form said maximum aperture; inertial delay means, located to be engaged by said diaphragm means after an unimpeded moVement of said diaphragm means towards said position to form said maximum aperture and after an exposure aperture has been formed which would permit exposure, for retarding the opening of said diaphragm means between said minimum and maximum aperture sizes; and light responsive means for moving said diaphragm means to said position of minimum aperture after said diaphragm means has moved to form an aperture of a size which permits exposure in relation to the intensity of received light.
Claim 3
Dependent Claim
200 words
In a camera of the type having means for controlling an exposure aperture-time relationship in response to received light, diaphragm shutter apparatus comprising; first and second apertured blades, mounted for movement for forming an exposure aperture of varied size; means for retaining said first and second blades in a position to form a minimum of said aperture; means for urging said first and second blades toward a position to form a maximum of said aperture; means for releasing said first and second blades for movement; inertial delay means, including a program element to selectively retard the movement of said first and second blades during movement from said minimum aperture positions toward said maximum aperture positions and being located to be engaged by at least one of said first or second blades after a preselected unretarded movement toward said position to form said maximum aperture, for controlling the movement of said first and second blades to provide a preselected relationship between aperture and time; and light responsive means for moving said first and second blades to form said aperture of minimum size when said aperture has reached an aperture size which permits exposure in a predetermined relation to received light intensity.
Claim 4
Dependent Claim
200 words
In a camera of the type having means for controlling an exposure aperture-time relationship in response to received light, diaphragm shutter apparatus comprising; first and second apertured blades, mounted for movement for forming an exposure aperture of varied size; means for retaining said first and second blades in a position to form a minimum of said aperture; means for urging said first and second blades toward a position to form a maximum of said aperture; means for releasing said first and second blades for movement; inertial delay means, including a program element to selectively retard the movement of said first and second blades during movement from said minimum aperture positions toward said maximum aperture positions and being located to be engaged by at least one of said first or second blades after a preselected unretarded movement toward said position to form said maximum aperture, for controlling the movement of said first and second blades to provide a preselected relationship between aperture and time; and light responsive means for moving said first and second blades to form said aperture of minimum size when said aperture has reached an aperture size which permits exposure in a predetermined relation to received light intensity.
Claim 5
Dependent Claim
48 words
Apparatus as claimed in claim 2 wherein said program element is an escapement disc having an irregularly stepped surface upon which said one blade is movable throughout the entire range of movement of said diaphragm means from a position of minimum aperture to a position of maximum aperture.
Claim 6
Dependent Claim
30 words
Apparatus as claimed in claim 2 wherein said program element is an escapement disc having an inclined surface which extends over the full range of movement of said diaphragm means.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-03-24 | 1978-09-23 | 1979-03-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-03-24 | 1982-09-23 | 1983-03-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-03-24 | 1986-09-23 | 1987-03-25 | $7700.00 | Window Closed / Lapsed |