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US3722391A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Actuating mechanism for an electrically controlled shutter
Assignee: Hattori Tokeiten KK
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Filing: 1971-04-30
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Granted: 1973-03-27
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Expires: 1991-04-30
Abstract
Abstract A camera and shutter in which the shutter exposure time is controlled by a control circuit and the shutter blades are actuated to an open position from a closed position back to the closed position by a mechanism actuated in one direction of movement. The mechanism is reversed in direction only when the shutter is cocked. Two springs cooperate in controlling the movement of a driving plate in one direction. One spring rotates the plate and the other rotates an intermediate control member that stops the driving plate in a shutter-opening position and then is released by the time delay control circuitry of the control circuit so that it allows the driving plate to move under control of its spring in the same direction in closing the shutter that it travelled in opening the shutter.
Inventors
- 👤 K Kitai
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 17:25
CPC Classifications
G; G03; G03B; G03B9/00; G03B9/58
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
228 words
In a camera having an electric shutter, in combination, a plurality of shutter blades opening and cloSing an exposure aperture, means operable in one direction only for actuating said shutter blades from an aperture-closing position to an open position opening the aperture and back to an aperture-closing position comprising a driving member, means operably connecting said driving member to said shutter blades, a spring biasing said driving member in one direction, means releasably holding the driving member in a start position in which said blades are in an aperture-closing position, control means selectively temporarily stopping the driving member in its travel in said direction when the shutter exposure aperture is opened, a spring biasing said control means in a direction for releasing the driving member, time-exposure control means releasably holding the control means, means cooperating with said control means and the first-mentioned spring to allow the first-mentioned spring to actuate said driving member in the same said direction for actuating the shutter blades to an aperture-closing position when said control member is released, said control means comprising a pivotably mounted multi-arm lever, an armature on an arm of said lever, said time-exposure control means comprising an electromagnet releasably attracting said armature driving a period when said aperture is open for taking an exposure, said spring biasing the driving member biasing the armature in the direction of said electromagnet.
Claim 2
Dependent Claim
228 words
In a camera having an electric shutter, in combination, a plurality of shutter blades opening and cloSing an exposure aperture, means operable in one direction only for actuating said shutter blades from an aperture-closing position to an open position opening the aperture and back to an aperture-closing position comprising a driving member, means operably connecting said driving member to said shutter blades, a spring biasing said driving member in one direction, means releasably holding the driving member in a start position in which said blades are in an aperture-closing position, control means selectively temporarily stopping the driving member in its travel in said direction when the shutter exposure aperture is opened, a spring biasing said control means in a direction for releasing the driving member, time-exposure control means releasably holding the control means, means cooperating with said control means and the first-mentioned spring to allow the first-mentioned spring to actuate said driving member in the same said direction for actuating the shutter blades to an aperture-closing position when said control member is released, said control means comprising a pivotably mounted multi-arm lever, an armature on an arm of said lever, said time-exposure control means comprising an electromagnet releasably attracting said armature driving a period when said aperture is open for taking an exposure, said spring biasing the driving member biasing the armature in the direction of said electromagnet.
Claim 3
Dependent Claim
216 words
In a shutter, in combination, a plurality of movable shutter blades operable from a closed position to an open position and back to a closed position for opening and closing an exposure aperture, driving means driven in one direction for operating said shutter blades to said position and back to said closed position, electromagnetic means, a time delay circuit controlling said electro-magnetic means, movably mounted intermediate means releasably controlled by said electromagnetic means and releasably held thereby when said shutter blades are in a cocked condition, said intermediate means having means engageable by said driving means during a driving operation for at times temporarily delaying said driving means in dependence upon the time of release of said intermediate means under control of said time delay circuit, first spring means connected with said driving means and said intermediate means to maintain them unengaged and biasing said driving means in said one direction, second spring means connected with said intermediate means biasing the intermediate means in said one direction that said driving means operates to open and close said shutter blades and driving it in said one direction when released by said electromagnetic means, and means for causing said electromagnetic means to release said intermediate means at least during driving of said driving means in said one direction.
Claim 4
Dependent Claim
216 words
In a shutter, in combination, a plurality of movable shutter blades operable from a closed position to an open position and back to a closed position for opening and closing an exposure aperture, driving means driven in one direction for operating said shutter blades to said position and back to said closed position, electromagnetic means, a time delay circuit controlling said electro-magnetic means, movably mounted intermediate means releasably controlled by said electromagnetic means and releasably held thereby when said shutter blades are in a cocked condition, said intermediate means having means engageable by said driving means during a driving operation for at times temporarily delaying said driving means in dependence upon the time of release of said intermediate means under control of said time delay circuit, first spring means connected with said driving means and said intermediate means to maintain them unengaged and biasing said driving means in said one direction, second spring means connected with said intermediate means biasing the intermediate means in said one direction that said driving means operates to open and close said shutter blades and driving it in said one direction when released by said electromagnetic means, and means for causing said electromagnetic means to release said intermediate means at least during driving of said driving means in said one direction.
Claim 5
Dependent Claim
32 words
In a shutter according to claim 2, in which said first spring biases said intermediate means in a direction of said electromagnetic means when said shutter blades are in a cocked condition.
Claim 6
Dependent Claim
42 words
In a shutter according to claim 2, in which said first spring is disposed to operate said driving means to open the shutter blades and second spring operates said driving means to close the shutter blades in conjunction with said first spring.
Claim 7
Dependent Claim
22 words
In a shutter according to claim 2, in which the force of said first spring exceeds the force of said second spring.
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) | 1976-03-26 | 1976-09-25 | 1977-03-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-03-26 | 1980-09-25 | 1981-03-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-03-26 | 1984-09-25 | 1985-03-27 | $7700.00 | Window Closed / Lapsed |