US3654845A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Photographic shutter with electro-magnetic drive means
Assignee: Compur Werk GmbH and Co
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Filing: 1970-03-30
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Granted: 1972-04-11
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Expires: 1990-03-30
Abstract
Abstract A photographic shutter having a shutter blade drive ring provided with magnetic coils disposed in the magnetic field of a magnet which is fixed in the housing. When the coils are energized, they react with the magnetic field of the magnet to cause the drive ring to turn, to open and close the shutter blades. An electronic circuit provides the pulses which energize the coils to operate the shutter.
Inventors
- 👤 Paul Fahlenberg
- 👤 Wilhelm Pross
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 09:56
CPC Classifications
G; G03; G03B; G03B9/00; G03B9/58
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
155 words
A photographic shutter having an optical axis and a housing, shutter blades arranged in said housing and movable between shutter closed and opened positions, a driving ring for moving said shutter blades, at least one magnetic coil fixed on said driving ring and having current input and output circuit connections, at least one ring shaped magnet fixed within said housing coaxially with respect to said optical axis and being magnetized in an axial direction with respect to said optical axis, said magnetic coil having a winding portion arranged in the magnetic field of said magnet and movable in common with said driving ring when a current flows through said magnetic coil, the winding portion (26a, 26b) of the magnetic coil (26) lying within the magnetic field being a flat shaped winding coil, the windings thereof running radially with respect to said optical axis and perpendicular with respect to a tangent of said driving ring, (16).
Claim 2
Dependent Claim
155 words
A photographic shutter having an optical axis and a housing, shutter blades arranged in said housing and movable between shutter closed and opened positions, a driving ring for moving said shutter blades, at least one magnetic coil fixed on said driving ring and having current input and output circuit connections, at least one ring shaped magnet fixed within said housing coaxially with respect to said optical axis and being magnetized in an axial direction with respect to said optical axis, said magnetic coil having a winding portion arranged in the magnetic field of said magnet and movable in common with said driving ring when a current flows through said magnetic coil, the winding portion (26a, 26b) of the magnetic coil (26) lying within the magnetic field being a flat shaped winding coil, the windings thereof running radially with respect to said optical axis and perpendicular with respect to a tangent of said driving ring, (16).
Claim 3
Dependent Claim
37 words
A shutter as defined in claim 1, wherein said driving ring is formed of molded synthetic plastic material and said coil is preformed to the desired shape and bonded to said driving ring during the molding thereof.
Claim 4
Dependent Claim
48 words
A shutter as defined in claim 2, wherein a part of the winding of the preformed coil is rigidly molded on said driving ring and another part of the winding is provided with a thin coating of the same plastic material from which said driving ring is formed.
Claim 5
Dependent Claim
50 words
A shutter as defined in claim 1, wherein said coil is mounted on and rotates with said driving ring, characterized by the fact that input and output circuit connections for said coil are conductively connected through tangentially yielding conducting connections with coupling connections arranged in fixed position of said housing.
Claim 6
Dependent Claim
17 words
A shutter as defined in claim 4, wherein said circuit connections yield radially as well as tangentially.
Claim 7
Dependent Claim
155 words
A photographic shutter having an optical axis and a housing, shutter blades arranged in said housing and movable between shutter closed and opened positions, a driving ring for moving said shutter blades, at least one magnetic coil fixed on said driving ring and having current input and output circuit connections, at least one ring shaped magnet fixed within said housing coaxially with respect to said optical axis and being magnetized in a radial direction with respect to said optical axis, said magnetic coil having a winding portion arranged in the magnetic field of said magnet and movable in common with said driving ring when a current flows through said magnetic coil, the winding portion (126a, 126b) of the magnetic coil (126) lying within the magnetic field being a ring shaped winding coil, the windings thereof running axially with respect to said optical axis and perpendicular with respect to a tangent of said driving ring (16).
Claim 8
Dependent Claim
155 words
A photographic shutter having an optical axis and a housing, shutter blades arranged in said housing and movable between shutter closed and opened positions, a driving ring for moving said shutter blades, at least one magnetic coil fixed on said driving ring and having current input and output circuit connections, at least one ring shaped magnet fixed within said housing coaxially with respect to said optical axis and being magnetized in a radial direction with respect to said optical axis, said magnetic coil having a winding portion arranged in the magnetic field of said magnet and movable in common with said driving ring when a current flows through said magnetic coil, the winding portion (126a, 126b) of the magnetic coil (126) lying within the magnetic field being a ring shaped winding coil, the windings thereof running axially with respect to said optical axis and perpendicular with respect to a tangent of said driving ring (16).
Claim 9
Dependent Claim
37 words
A shutter as defined in claim 6, wherein said driving ring is formed of molded synthetic plastic material and said coil is preformed to the desired shape and bonded to said driving ring during the molding thereof.
Claim 10
Dependent Claim
48 words
A shutter as defined in claim 7, wherein a part of the winding of the preformed coil is rigidly mounted on said driving ring and another part of the windiNg is provided with a thin coating of the same plastic material from which said driving ring is formed.
Claim 11
Dependent Claim
50 words
A shutter as defined in claim 6, wherein said coil is mounted on and rotates with said driving ring, characterized by the fact that input and output circuit connections for said coil are conductively connected through tangentially yielding conducting connections with coupling connections arranged in fixed position on said housing.
Claim 12
Dependent Claim
17 words
A shutter as defined in claim 9, wherein said circuit connections yield radially as well as tangentially.
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) | 1975-04-11 | 1975-10-11 | 1976-04-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-04-11 | 1979-10-11 | 1980-04-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-04-11 | 1983-10-11 | 1984-04-11 | $7700.00 | Window Closed / Lapsed |