US3735687A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rotary shutter
Assignee: Individual
•
Filing: 1970-11-25
•
Granted: 1973-05-29
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Expires: 1990-11-25
Abstract
Abstract A high speed camera is especially adapted for aerial photography and it includes conventional rotary discs and a capping shutter. The rotary discs contain openings for alignment with the aperture of the camera. These discs, instead of being rotated synchronously, are rotated at different speeds, e.g. 4 to 3, respectively, whereby the disc openings become aligned with the camera aperture on multiple revolutions of the discs rather than on only one revolution. This permits operation of the capping shutter at a much slower speed, thus avoiding the impact forces of conventonal cameras when operating the capping shutter.
Inventors
- 👤 W Park
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 15:12
CPC Classifications
G; G03; G03B; G03B9/00; G03B9/08
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
164 words
In a high speed camera having an exposure aperture, two rotary disk shutters, said disk shutters having aperture openings alignable with each other and said exposure aperture, and a capping shutter for opening and closing said exposure aperture the improvement comprising: means for rotating said rotary disk shutters at different relative speeds to cause said aperture openings therein to approach each other from opposite directions and become aligned with each other and said exposure aperture at intervals corresponding to multiple revolutions of said rotary disk shutters, and means for opening and closing said capping shutter during said intervals, including a first shaft, means for constantly driving the shaft, a second shaft normally stationary, and a releasable coupling between said shafts, including a spur connected to the rotating shaft and a lever having a spur engageable notch pivotally connected to the other shaft, said lever being movable between positions of engagement and disengagement with the spur and means for moving the lever between said positions.
Claim 2
Dependent Claim
164 words
In a high speed camera having an exposure aperture, two rotary disk shutters, said disk shutters having aperture openings alignable with each other and said exposure aperture, and a capping shutter for opening and closing said exposure aperture the improvement comprising: means for rotating said rotary disk shutters at different relative speeds to cause said aperture openings therein to approach each other from opposite directions and become aligned with each other and said exposure aperture at intervals corresponding to multiple revolutions of said rotary disk shutters, and means for opening and closing said capping shutter during said intervals, including a first shaft, means for constantly driving the shaft, a second shaft normally stationary, and a releasable coupling between said shafts, including a spur connected to the rotating shaft and a lever having a spur engageable notch pivotally connected to the other shaft, said lever being movable between positions of engagement and disengagement with the spur and means for moving the lever between said positions.
Claim 3
Dependent Claim
29 words
In a high speed camera as defined by claim 1 in which the relative speeds of the rotary shutters are n and n - 1, respectively, per unit time.
Claim 4
Dependent Claim
26 words
In a high speed shutter defined by claim 1 in which the relative speeds of the rotary shutters are 4 and 3, respectively, per unit time.
Claim 5
Dependent Claim
22 words
In a high speed camera as defined by claim 1, means biasing the lever to a position of engagement with the spur.
Claim 6
Dependent Claim
18 words
In a high speed camera as defined by claim 1 in which the biasing means comprises a hairspring.
Claim 7
Dependent Claim
24 words
In a high speed camera as defined by claim 4 and overriding counterbiasing means for intermittently moving the lever to disengagement with the spur.
Claim 8
Dependent Claim
28 words
In a high speed camera as defined by claim 4 and means for moving the lever to a position of disengagement against the action of said biasing means.
Claim 9
Dependent Claim
53 words
In a high speed camera as defined by claim 1 in which the lever has a finger integral therewith for moving the lever, abutments rotatable with the lever shaft for limiting the movement of the finger relative to the lever shaft to positions of engagement and disengagement of the spur with the lever.
Claim 10
Dependent Claim
38 words
In a high speed camera as defined by claim 8 having an abutment in the path of travel of the finger and means for moving the abutment in and out of the path of travel of the finger.
Claim 11
Dependent Claim
40 words
In a high speed camera as defined by claim 9 in which two abutments are provided and means for alternately bringing one of the abutments in the path of travel of the finger to the exclusion of the other abutment.
Claim 12
Dependent Claim
40 words
In a high speed camera as defined by claim 10 in which the abutments are provided on a pivoted lever and means biasing the lever to a position where one abutment lies in the path of travel of the finger.
Claim 13
Dependent Claim
24 words
In a high speed camera as defined by claim 11 in which the abutments are spAced apart on the lever to straddle the finger.
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) | 1976-05-28 | 1976-11-27 | 1977-05-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-05-28 | 1980-11-27 | 1981-05-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-05-28 | 1984-11-27 | 1985-05-29 | $7700.00 | Window Closed / Lapsed |