Patent US3646871A successfully refreshed from Google Patents.
US3646871A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Diaphragm adjustment device for a motion picture camera
Assignee: Paillard SA
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Filing: 1970-03-02
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Granted: 1972-03-07
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Expires: 1990-03-02
Abstract
Abstract An automatic control and a manual regulator for the diaphragm are combined with preselection apparatus so that after manual focusing adjustment at maximum aperture, the latter is restored to automatic control on actuating the filming trigger. The automatic control comprises an electric motor actuating the diaphragm through a coupling and a friction clutch with a locking member. The coupling has two parts held in a certain position by a spring and two stops, and is rotatably mounted on a springurged sliding shaft fixed to a control button and bearing a cogwheel which meshes with a pinion for automatic control and disengages for manual control. Under or over exposure is indicated by lamps controlled by a contactor responsive to the direction of rotation of the motor.
Inventors
- 👤 Gilbert Ramet
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 08:49
CPC Classifications
G; G03; G03B; G03B9/00; G03B9/02; G03B9/07
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
185 words
In a photographic apparatus having automatic setting means for a diaphragm control element comprising, a motor in circuit with photoelectric means, the improvement including, coupling means connecting said motor to said control element, said coupling means including first and second adjacent rotary parts having stop means, said first rotary part entrained by said motor, spring means urging said rotary parts to a given relative position as limited by said stop means, catch means selectively engageable with said motor entrained first rotary part to immobilize same, a third rotary part disposed adjacent said second rotary part and carried by a manually operable cOntrol member movable to adjust said diaphragm control element against the force of said spring means into full open position of said diaphragm, holding means engageable with said third rotary part to maintain the diaphragm in open position against the force of said spring means upon adjustment of said movably operable control member, and release means operable to disengage said holding means to allow said motor to return the diaphragm to the setting as determined by said first rotary part entrained by said motor.
Claim 2
Dependent Claim
185 words
In a photographic apparatus having automatic setting means for a diaphragm control element comprising, a motor in circuit with photoelectric means, the improvement including, coupling means connecting said motor to said control element, said coupling means including first and second adjacent rotary parts having stop means, said first rotary part entrained by said motor, spring means urging said rotary parts to a given relative position as limited by said stop means, catch means selectively engageable with said motor entrained first rotary part to immobilize same, a third rotary part disposed adjacent said second rotary part and carried by a manually operable cOntrol member movable to adjust said diaphragm control element against the force of said spring means into full open position of said diaphragm, holding means engageable with said third rotary part to maintain the diaphragm in open position against the force of said spring means upon adjustment of said movably operable control member, and release means operable to disengage said holding means to allow said motor to return the diaphragm to the setting as determined by said first rotary part entrained by said motor.
Claim 3
Dependent Claim
27 words
A photographic apparatus according to claim 1 wherein, said release means acting on said holding means comprises an element combined with the shutter release of the apparatus.
Claim 4
Dependent Claim
18 words
A photographic apparatus according to claim 1, including, friction means connecting said motor to said first rotary part.
Claim 5
Dependent Claim
17 words
A photographic apparatus according to claim 1, including means indicating the direction of rotation of said motor.
Claim 6
Dependent Claim
65 words
A photographic apparatus according to claim 1 wherein, said third rotary part is axially movable by means of said manually operable control member whereby said first and second rotary parts are displaced to interrupt linking engagement between said motor and diaphragm control element to allow free manual adjustment of said diaphragm control element by subsequent rotary displacement of said control member and third rotary part.
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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) | 1975-03-07 | 1975-09-06 | 1976-03-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-03-07 | 1979-09-06 | 1980-03-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-03-07 | 1983-09-06 | 1984-03-07 | $7700.00 | Window Closed / Lapsed |