US3903539A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Focal plane shutter blades for camera
Assignee: Seiko Koki KK
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Filing: 1974-09-16
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Granted: 1975-09-02
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Expires: 1994-09-16
Abstract
Abstract A focal plane shutter and shutter blade operating devices for a camera. The focal plane shutter has a plurality of shutter blades arranged in two separate groups operated independently of each other as a shutter-opening blade group and a shutter-closing blade group. A shutter blade operating mechanism comprises separate devices for opening and closing the shutter with the two groups independently of each other driven in the same direction. Each shutter blade group has a slit-forming or aperture-forming shutter blade and a swinging shutter blade driven separately from the other shutter blades of the groups. A main shutter bladedriving lever and an auxiliary parallel lever are both pivotally connected to each slit-forming shutter blade in each group of shutter blades. These two levers in each group of shutter blades are connected to the slit-forming shutter blades with pivots in a common plane and with these pivots on the blade spaced equally from the respective centers of rotation of the parallel levers. The parallel levers function in a parallel arrangement to maintain aperture-forming straight edges travelling across the exposure aperture of the shutter uniformly. The swinging blades in both groups in one embodiment of the invention are pivoted on respective ones of the parallel levers and in a second embodiment are pivoted on the slit-forming shutter blade transported by the operating parallel levers.
Inventors
- 👤 Kiyoshi Kitai
- 👤 Eiichi Onda
- 👤 Mitsuo Koyama
- 👤 Shinji Nagaoka
- 👤 Tadashi Nakagawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 12:10
CPC Classifications
G; G03; G03B; G03B9/00; G03B9/08; G03B9/10; G03B9/18
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
227 words
In a focal-plane type shutter for a camera the combination of: means defining a shutter aperture; a first group and a second group of shutter blades, each group alternately opening and closing said aperture when each is in an opening and closing position, respectively, and each group having a slit-forming shutter blade, a swinging shutter blade and a plurality of other shutter blades; means mounting said first group of shutter blades for cooperative movement in a general direction from the opening position to the closing position thereof, and reverse; and means mounting said second group of shutter blades for cooperative movement from the opening to the closing position thereof, and reverse, in a general direction opposite to that of said first group; the mounting means of each group comprising: pivot means, parallel lever means pivotally mounted thereat connected to the corresponding slit-forming shutter blade for displacement of that blade into the opening position thereof when the respective lever means move in a first angular direction, means mounting said swinging shutter blade for displacement in response to moving of the respective lever means and in angular direction opposite to that of the respective moving of the respective lever means, and means mounting said other shutter blades for sequential displacement in response to angular moving of the respective lever means and in the same angular direction as the same.
Claim 2
Dependent Claim
227 words
In a focal-plane type shutter for a camera the combination of: means defining a shutter aperture; a first group and a second group of shutter blades, each group alternately opening and closing said aperture when each is in an opening and closing position, respectively, and each group having a slit-forming shutter blade, a swinging shutter blade and a plurality of other shutter blades; means mounting said first group of shutter blades for cooperative movement in a general direction from the opening position to the closing position thereof, and reverse; and means mounting said second group of shutter blades for cooperative movement from the opening to the closing position thereof, and reverse, in a general direction opposite to that of said first group; the mounting means of each group comprising: pivot means, parallel lever means pivotally mounted thereat connected to the corresponding slit-forming shutter blade for displacement of that blade into the opening position thereof when the respective lever means move in a first angular direction, means mounting said swinging shutter blade for displacement in response to moving of the respective lever means and in angular direction opposite to that of the respective moving of the respective lever means, and means mounting said other shutter blades for sequential displacement in response to angular moving of the respective lever means and in the same angular direction as the same.
Claim 3
Dependent Claim
45 words
In a focal-plane type shutter, a combination according to claim 1, wherein said aperture is rectangular, wherein said slit-forming shutter blade has a leading, straight edge, and wherein said lever means includes means for maintaining said straight edge parallel to a side of said aperture.
Claim 4
Dependent Claim
75 words
In a focal-plane type shutter, a combination according to claim 1, wherein said means mounting said swinging shutter blade includes additional pivot means disposed on said slit-forming blade and movable therewith, for pivotally connecting said swinging shutter blade to said lever means, and wherein said means mounting said other shutter blades includes third pivot means and means pivotally mounting said other blades thereat for pivotally connecting each of said other blades to said lever means.
Claim 5
Dependent Claim
70 words
In a focal-plane type shutter, a combination according to claim 3, which includes two pairs of pivots, one pair of each parallel lever means, and wherein each parallel lever means comprises two levers and means pivotally mounting each, at one end portion thereof, to one pivot of one of said pairs of pivots, and pivotally mounting each, at the other end portion thereof, relative to the respective slit-forming shutter blade.
Claim 6
Dependent Claim
36 words
In a focal-plane type shutter, a combination according to claim 3, including a pivot for one of said levers of each pair of parallel levers, the latter pivot being disposed on the respective slit-forming shutter blade.
Claim 7
Dependent Claim
79 words
A focal-plane type shutter according to claim 3, wherein the means connecting said swinging shutter blade and the means connecting said other shutter blades to said lever means comprise means defining an elongated slot in said swinging shutter blade and a slot in each of said other shutter blades, and two pins, each connected to said lever means, one received in the slot in said swinging shutter blade and one received in the slots in said other shuttEr blades.
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) | 1978-09-01 | 1979-03-03 | 1979-09-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-09-01 | 1983-03-03 | 1983-09-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-09-01 | 1987-03-03 | 1987-09-02 | $7700.00 | Window Closed / Lapsed |