US3670636A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for controlling the shutter speed of photographic cameras
Assignee: Ernst Leitz Wetzlar GmbH
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Filing: 1970-08-31
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Granted: 1972-06-20
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Expires: 1990-08-31
Abstract
Abstract Apparatus for controlling the shutter speed of photographic cameras which includes mechanical components for controlling the shutter speed in the short-time range combined with an electric timing circuit and an electromagnet for effecting control in the long-time range.
Inventors
- 👤 Werner Holle
- 👤 Arthur Kessler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 18:57
CPC Classifications
G; G03; G03B; G03B7/00; G03B7/08; G03B7/081; G03B7/083; G03B9/00; G03B9/08; G03B9/36; G03B9/40; G03B9/42
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
175 words
A photographic camera comprising first and second shutter blinds, first means for releasably locking said first shutter blind in a retracted position, second means for releasably locking said second shutter blind in a retracted position, drive means for driving said first and said second shutter blinds from a retracted position to a released position upon release of said first and said second means, a lever movably attached to said second means with one end of said lever extending into the path of travel of said drive means, a cam adjacent the second end of said lever for adjusting the position of said one end in the path of travel of said drive means, such that said drive means strikes said lever and releases said second means, a variable resistor connected with said cam and movable simultaneously with said cam, an electromagnet adjacent said second means and a timing circuit connecting said variable resistor and said electromagnet such that on the expiration of a selected time interval said electromagnet is energized and releases said second means.
Claim 2
Dependent Claim
175 words
A photographic camera comprising first and second shutter blinds, first means for releasably locking said first shutter blind in a retracted position, second means for releasably locking said second shutter blind in a retracted position, drive means for driving said first and said second shutter blinds from a retracted position to a released position upon release of said first and said second means, a lever movably attached to said second means with one end of said lever extending into the path of travel of said drive means, a cam adjacent the second end of said lever for adjusting the position of said one end in the path of travel of said drive means, such that said drive means strikes said lever and releases said second means, a variable resistor connected with said cam and movable simultaneously with said cam, an electromagnet adjacent said second means and a timing circuit connecting said variable resistor and said electromagnet such that on the expiration of a selected time interval said electromagnet is energized and releases said second means.
Claim 3
Dependent Claim
15 words
The apparatus of claim 1, including means actuating said drive means and said electromagnet simultaneously.
Claim 4
Dependent Claim
75 words
The apparatus of claim 1, wherein said electromagnet is a holding magnet, said second shutter blind has as said second means for releasably locking said second shutter blind a pawl, spring means positioned against said pawl, said pawl held in its locking position against the force of said spring means by said holding magnet, and including a mechanical member for releasing said pawl from its locking position during the movement of said first shutter blind.
Claim 5
Dependent Claim
70 words
The apparatus of claim 1, wherein said camera has as said second means for releasably locking said second shutter blind a pawl, a mechanical member movable together with said first shutter blind for forcing the release of said pawl from its locking position, said timing circuit and said electromagnet comprising a holding magnet connected to said pawl whereby said mechanical member is actuated only when said magnet is without current.
Claim 6
Dependent Claim
89 words
The apparatus of claim 4, wherein there is provided between said first shutter blind and said pawl a connectIng lever, speed control setting means geared to said connecting lever, said connecting lever being displaceable upon adjustment of said speed control setting means and being pivotable in all positions, spring means bearing against said connecting lever, said connecting lever being in contacting engagement with said pawl and being pivotably mounted whereby said connecting lever can act against the force of spring means to displace said pawl from its locking position.
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) | 1975-06-20 | 1975-12-20 | 1976-06-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-06-20 | 1979-12-20 | 1980-06-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-06-20 | 1983-12-20 | 1984-06-20 | $7700.00 | Window Closed / Lapsed |