US3680460A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Motor driver diaphragm shutter
Assignee: Hittech Prontor GmbH
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Filing: 1970-05-11
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Granted: 1972-08-01
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Expires: 1990-05-11
Abstract
Abstract A photographic camera is provided with a shutter blade system that simultaneously serves to set the shutter opening. The shutter blade system is movable out of the closed position by means of a setter in opposition to the force of a return spring. A motorized drive operates to open the shutter blade system and is operatively connectable to the setter so as to periodically switch the setter ahead. An electronic control device is operatively connected to the motorized drive. The control device, relative to the time of the start of the motor drive, provides a switch impulse to an electro-mechanical mechanism which brings about a separation of the connection between the motorized drive and the setter according to a pre-selected or light-dependent determined time interval ascertained by a light-sensitive element.
Inventors
- 👤 Franz W R Starp
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 22:18
CPC Classifications
G; G03; G03B; G03B9/00; G03B9/08; G03B9/10; G03B9/18; G03B9/22; G03B7/00; G03B7/08; G03B7/081; G03B7/087; G03B9/58
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
199 words
A photographic camera including a shutter blade system simultaneously serving as a diaphragm aperture device, comprising, in combination, a setter connected to said blade system and operable to move said blade system out of its closed position; a return spring engaged with said setter and biasing the same to move said blade system to its closed position; motorized drive means operatively associated with said setter and operable to actuate said setter to move said blade system out of its closed position; electromagnetic means operatively associated with said drive means to control connection of said drive means to said setter; electronic control means connected to said drive means and to said electromagnetic means and operable, responsive to operation of a release member, to energize said drive means and to condition said electromagnetic means to connect said drive means to said setter; and time constant responsive means in said control means operable, when a time period following energization of said drive means results in a predetermined time constant, to condition said electromagnetic means to disconnect said drive means from said setter for return of said setter to a position moving said blade system to its closed position, by said return spring.
Claim 2
Dependent Claim
199 words
A photographic camera including a shutter blade system simultaneously serving as a diaphragm aperture device, comprising, in combination, a setter connected to said blade system and operable to move said blade system out of its closed position; a return spring engaged with said setter and biasing the same to move said blade system to its closed position; motorized drive means operatively associated with said setter and operable to actuate said setter to move said blade system out of its closed position; electromagnetic means operatively associated with said drive means to control connection of said drive means to said setter; electronic control means connected to said drive means and to said electromagnetic means and operable, responsive to operation of a release member, to energize said drive means and to condition said electromagnetic means to connect said drive means to said setter; and time constant responsive means in said control means operable, when a time period following energization of said drive means results in a predetermined time constant, to condition said electromagnetic means to disconnect said drive means from said setter for return of said setter to a position moving said blade system to its closed position, by said return spring.
Claim 3
Dependent Claim
75 words
The photographic camera of claim 1, in which said drive means includes a frequency generator; an electromagnetic device, including an oscillatable permanent magnet, connected to said frequency generator for energization thereby; a mechanical stepping mechanism connected to said oscillatable permanent magnet and including a push pawl carried by said permanent magnet; said setter having a circular periphery provided with saw-like teeth engageable by said push pawl for driving of said setter by said drive means.
Claim 4
Dependent Claim
22 words
The photographic camera of claim 2, in which said time constant responsive means comprises a sweep circuit connected to an RC member.
Claim 5
Dependent Claim
66 words
The photographic camera of claim 3, in which said electromagnetic means comprises a holding electromagnet; a pivotally mounted lever; an armature carried by said lever and cooperable with said electromagnet for movement of said lever in a direction providing for engagement of said push pawl with said saw teeth; and a spring biasing said lever to a position disengaging said push pawl from said saw teeth.
Claim 6
Dependent Claim
35 words
The photographic camera of claim 3, including mechanical switches connected in the circuit of said electronic control means; and a spring biased control disk with an associated plurality of cams operable to actuate said switches.
Claim 7
Dependent Claim
56 words
The photographic camera of claim 5, in which said control disk is movable into a cocked position against its spring bias; and positioning means operatively associating said lever and said control disk and swinging said lever to a position engaging said armature with said electromagnet responsive to movement of said control disk into the cocked position.
Claim 8
Dependent Claim
31 words
The photographic camera of claim 4, including a camera release; mechanical switches included in said electronic control means; and control means on said camera release operable to actuate said mechanical switches.
Claim 9
Dependent Claim
68 words
The photographic camera of claim 1, in which said drive means comprises mechanical stepping means including a push pawl; said setter having a circular periphery provided with saw teeth engageable by said push pawl; a DC motor; circuit means controlling energization of said DC motor; a rotatable switching cam operable to actuate said mechanical steppinG means; and intermediate gearing mechanically connecting said DC motor and said switching cam.
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) | 1975-08-01 | 1976-01-31 | 1976-08-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-08-01 | 1980-01-31 | 1980-08-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-08-01 | 1984-01-31 | 1984-08-01 | $7700.00 | Window Closed / Lapsed |