US3633484A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electromagnetic shutter mechanism for a camera
Assignee: Fujifilm Holdings Corp
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Filing: 1970-03-24
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Granted: 1972-01-11
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Expires: 1990-03-24
Abstract
Abstract A pivotable shutter blade is spring biased to closed position and carries a pin fixed thereto for closing a switch to the timeconstant circuit, which in turn energizes an electromagnet which momentarily maintains the shutter in open position for a time dependent upon full charging of the condenser of the timeconstant circuit. The face of the electromagnet is parallel with the plane of the shutter.
Inventors
- 👤 Yoshizo Ikegami
- 👤 Kuniomi Abe
- 👤 Maskazu Nagai
- 👤 Susumu Fukuda
- 👤 Takehiko Kakei
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 07:15
CPC Classifications
G; G03; G03B; G03B9/00; G03B9/08
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
139 words
An electromagnetic shutter mechanism for a camera including a shutter blade movable between aperture closing and aperture opening position, a time-constant circuit employing condenser, a voltage source for charging said condense, and a photoelectric element for controlling the charging rate thereof, the improvement comprising: an electromagnet, for maintaining said shutter in aperture open position, and energizable by said voltage source for a time determined by said time-constant circuit, spring biasing means for biasing said shutter blade toward aperture closing position, said electromagnet being positioned such that the eNd face thereof lies parallel to but spaced slightly form the plane defined by a portion of said shutter blade when in full closed position, and means for insuring full face contact between at least a portion of said shutter blade and said electromagnet when said blade moves into full open position.
Claim 2
Dependent Claim
139 words
An electromagnetic shutter mechanism for a camera including a shutter blade movable between aperture closing and aperture opening position, a time-constant circuit employing condenser, a voltage source for charging said condense, and a photoelectric element for controlling the charging rate thereof, the improvement comprising: an electromagnet, for maintaining said shutter in aperture open position, and energizable by said voltage source for a time determined by said time-constant circuit, spring biasing means for biasing said shutter blade toward aperture closing position, said electromagnet being positioned such that the eNd face thereof lies parallel to but spaced slightly form the plane defined by a portion of said shutter blade when in full closed position, and means for insuring full face contact between at least a portion of said shutter blade and said electromagnet when said blade moves into full open position.
Claim 3
Dependent Claim
50 words
The shutter mechanism, as claimed in claim 1, further comprising skewed plates disposed on each side of said movable shutter blade in spaced parallel fashion adjacent to said magnet to cause said shutter blade to move into contact with the end face of said magnet when in full open position.
Claim 4
Dependent Claim
72 words
The shutter mechanism as claimed in claim 1, wherein the leading edge of said shutter blade is bent away from the pale defined by the end face of said electromagnet while the surface of the trailing edge of the same facing said electromagnet is coplanar therewith so as to effect full face contact between said trailing edge and the end face of said electromagnet when said blade moves into full open 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) | 1975-01-10 | 1975-07-12 | 1976-01-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-01-10 | 1979-07-12 | 1980-01-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-01-10 | 1983-07-12 | 1984-01-11 | $7700.00 | Window Closed / Lapsed |