US4401380A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Blade for focal plane shutter
Assignee: Nikon Corp
•
Filing: 1982-02-09
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Granted: 1983-08-30
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Expires: 2002-02-09
Abstract
Abstract A shutter blade for focal plane shutter, in which the blade thickness is made the thinnest possible by forming a plurality of recesses throughout the whole area, except for the connecting part of the blade with a drive mechanism and the outer peripheral edge of the blade. The recesses are in the regular polygonal shape such as hexagon, square, triangle, and so forth.
Inventors
- 👤 Akihiko Sato
- 👤 Yoshiyuki Nakano
- 👤 Etsuo Tanaka
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 13:31
CPC Classifications
G; G03; G03B; G03B9/00; G03B9/08; G03B9/10; G03B9/18
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
194 words
A shutter blade for a focal plane shutter comprising an opaque plate adapted to move across a film exposure aperture, the plate having a connecting portion adapted to connect the blade to a drive mechanism, having an outer peripheral edge portion contiguous with the connecting portion, the outer peripheral edge portion circumscribing the edge of the plate and defining the outer boundary thereof, and having an interior portion within the peripheral edge portion, the interior portion including a plurality of recesses greater than two of a regular polygonal shape, each recess being of the same size and shape, and a plurality of ribs connected together and to the peripheral edge portion, adjacent recesses being separated by one of said ribs and being symmetrically disposed with respect to said one rib, the connecting portion and the peripheral edge portion defining areas of the shutter blade having greater thickness than the areas of said recesses, which recess areas do not penetrate the thickness of the plate, and wherein the connecting portion, the peripheral edge portion, and the ribs are arranged to carry mechanical stresses applied to the blade and to relieve the recesses of mechanical stresses.
Claim 2
Dependent Claim
194 words
A shutter blade for a focal plane shutter comprising an opaque plate adapted to move across a film exposure aperture, the plate having a connecting portion adapted to connect the blade to a drive mechanism, having an outer peripheral edge portion contiguous with the connecting portion, the outer peripheral edge portion circumscribing the edge of the plate and defining the outer boundary thereof, and having an interior portion within the peripheral edge portion, the interior portion including a plurality of recesses greater than two of a regular polygonal shape, each recess being of the same size and shape, and a plurality of ribs connected together and to the peripheral edge portion, adjacent recesses being separated by one of said ribs and being symmetrically disposed with respect to said one rib, the connecting portion and the peripheral edge portion defining areas of the shutter blade having greater thickness than the areas of said recesses, which recess areas do not penetrate the thickness of the plate, and wherein the connecting portion, the peripheral edge portion, and the ribs are arranged to carry mechanical stresses applied to the blade and to relieve the recesses of mechanical stresses.
Claim 3
Dependent Claim
33 words
A shutter blade in accordance with claim 1, wherein the plurality of ribs includes ribs arranged to extend in a direction in which impact forces caused by inertia are exerted on the blade.
Claim 4
Dependent Claim
19 words
A shutter blade in accordance with claim 1, wherein the recesses are formed on opposite surfaces of the plate.
Claim 5
Dependent Claim
17 words
A shutter blade in accordance with claim 1, wherein the recesses are of a regular hexagonal shape.
Claim 6
Dependent Claim
16 words
A shutter blade in accordance with claim 1, wherein the recesses are of a square shape.
Claim 7
Dependent Claim
23 words
A shutter blade in accordance with claim 1, wherein the thickness of the connecting portion and the outer peripheral edge portion is uniform.
Claim 8
Dependent Claim
141 words
A shutter blade for a focal plane shutter comprising an opaque plate adapted to move across a film exposure aperture, the plate having a connecting portion adapted to connect the blade to a drive mechanism, an interior portion comprising a plurality of interconnected ribs defining a plurality of more than two recesses, which recesses do not penetrate the plate, each recess being the same size and having the same regular polygonal shape and adjacent recesses being arranged symmetrically with respect to one of said ribs, and a peripheral portion surrounding and defining said interior portion, the connecting portion, the ribs and the peripheral portion being contiguous and defining areas of the shutter blade having greater thickness than the areas of said recesses and being arranged to carry mechanical stresses applied to the blade and to relieve the recesses of mechanical stresses.
Claim 9
Dependent Claim
141 words
A shutter blade for a focal plane shutter comprising an opaque plate adapted to move across a film exposure aperture, the plate having a connecting portion adapted to connect the blade to a drive mechanism, an interior portion comprising a plurality of interconnected ribs defining a plurality of more than two recesses, which recesses do not penetrate the plate, each recess being the same size and having the same regular polygonal shape and adjacent recesses being arranged symmetrically with respect to one of said ribs, and a peripheral portion surrounding and defining said interior portion, the connecting portion, the ribs and the peripheral portion being contiguous and defining areas of the shutter blade having greater thickness than the areas of said recesses and being arranged to carry mechanical stresses applied to the blade and to relieve the recesses of mechanical stresses.
Claim 10
Dependent Claim
170 words
A shutter blade for a focal plane shutter comprising an opaque plate adapted to move across a film exposure aperture, the plate having a connecting portion adapted to connect the blade to a drive mechanism, having an outer peripheral edge portion contiguous with the connecting portion, the outer peripheral edge portion circumscribing the edge of the plate and defining the outer boundary thereof, and having an interior portion within the peripheral edge portion, the interior portion including a plurality of recesses greater than two, and a plurality of ribs connected together and to the peripherial edge portion, adjacent recesses being separated by one of said ribs, the connecting portion and the peripheral edge portion defining areas of the shutter blade having greater thickness than the areas of said recesses, which recess areas do not penetrate the thickness of the plate, and wherein the connecting portion, the peripheral edge portion, and the ribs are arranged to carry mechanical stresses applied to the blade and to relieve the recesses of mechanical stresses.
Claim 11
Dependent Claim
170 words
A shutter blade for a focal plane shutter comprising an opaque plate adapted to move across a film exposure aperture, the plate having a connecting portion adapted to connect the blade to a drive mechanism, having an outer peripheral edge portion contiguous with the connecting portion, the outer peripheral edge portion circumscribing the edge of the plate and defining the outer boundary thereof, and having an interior portion within the peripheral edge portion, the interior portion including a plurality of recesses greater than two, and a plurality of ribs connected together and to the peripherial edge portion, adjacent recesses being separated by one of said ribs, the connecting portion and the peripheral edge portion defining areas of the shutter blade having greater thickness than the areas of said recesses, which recess areas do not penetrate the thickness of the plate, and wherein the connecting portion, the peripheral edge portion, and the ribs are arranged to carry mechanical stresses applied to the blade and to relieve the recesses of mechanical stresses.
Claim 12
Dependent Claim
45 words
A shutter blade in accordance with claim 8, wherein said plurality of ribs are connected together at a plurality of connection points within said interior portion, and the ribs that are connected together at each connection point extend from the connection point in different directions.
Claim 13
Dependent Claim
23 words
A shutter blade in accordance with claim 9, wherein each rib extending from said connection points extends in one of three predetermined directions.
Claim 14
Dependent Claim
29 words
A shutter blade in accordance with claim 9, wherein the ribs extending from a connection point are arranged at an angle of 120 degrees with respect to one another.
Claim 15
Dependent Claim
38 words
A shutter blade in accordance with claim 8, wherein the plurality of recesses comprise first and second groups of recesses, the recesses of each group being arranged such that they extend along one of first or second lines.
Claim 16
Dependent Claim
21 words
A shutter blade in accordance with claim 8, wherein the plurality of ribs are connected together to form a zig-zag pattern.
Claim 17
Dependent Claim
115 words
A shutter blade for a focal plane shutter comprising an opaque plate adapted to move across a film exposure aperture, the plate having a connecting portion adapted to connect the blade to a drive mechanism, an interior portion comprising a plurality of interconnected ribs defining a plurality of more than two recesses, which recesses do not penetrate the plate, and a peripheral portion surrounding and defining said interior portion, the connecting portion, the ribs and the peripheral portion being contiguous and defining areas of the shutter blade having greater thickness than the areas of said recesses and being arranged to carry mechanical stresses applied to the blade and to relieve the recesses of mechanical stresses.
Claim 18
Dependent Claim
115 words
A shutter blade for a focal plane shutter comprising an opaque plate adapted to move across a film exposure aperture, the plate having a connecting portion adapted to connect the blade to a drive mechanism, an interior portion comprising a plurality of interconnected ribs defining a plurality of more than two recesses, which recesses do not penetrate the plate, and a peripheral portion surrounding and defining said interior portion, the connecting portion, the ribs and the peripheral portion being contiguous and defining areas of the shutter blade having greater thickness than the areas of said recesses and being arranged to carry mechanical stresses applied to the blade and to relieve the recesses of mechanical stresses.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-08-29 | 1987-02-28 | 1987-08-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-08-29 | 1991-02-28 | 1991-08-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-08-29 | 1995-02-28 | 1995-08-30 | $7700.00 | Window Closed / Lapsed |