US3675562A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Iris diaphragm for a camera
Assignee: Canon Inc
•
Filing: 1970-06-24
•
Granted: 1972-07-11
•
Expires: 1990-06-24
Abstract
Abstract An iris diaphragm for a camera which is characterized in forming at least a part of one side of each diaphragm blade constituting a diaphragm aperture in a nonlinear, concavo-convex shape so that the generation of glare is reduced.
Inventors
- 👤 Noriaki Sanada
- 👤 Masaharu Ito
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 19:13
CPC Classifications
G; G03; G03B; G03B9/00; G03B9/08; G02; G02B; G02B5/00; G02B5/005
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
85 words
A light diaphragm, comprising a plurality of overlapping blades, said blades each having an aperture-forming edge and being arranged to form an aperture with the edges, said blades being movable for varying the portion of the edges that form the aperture and for varying the size of the aperture, said blades each defining at the edge a plurality of cyclical undulations which have extremeties, the extremeties of at least a plurality of said undulations on each blade projecting into the aperture formed by the blades.
Claim 2
Dependent Claim
85 words
A light diaphragm, comprising a plurality of overlapping blades, said blades each having an aperture-forming edge and being arranged to form an aperture with the edges, said blades being movable for varying the portion of the edges that form the aperture and for varying the size of the aperture, said blades each defining at the edge a plurality of cyclical undulations which have extremeties, the extremeties of at least a plurality of said undulations on each blade projecting into the aperture formed by the blades.
Claim 3
Dependent Claim
14 words
A diaphragm as in claim 1, wherein said blades are pivotally mounted for movement.
Claim 4
Dependent Claim
26 words
A diaphragm as in claim 1, wherein said blades are sickle shaped and the edges having said undulations are on the interior of the sickle shape.
Claim 5
Dependent Claim
14 words
A diaphragm as in claim 3, wherein said blades are pivotally mounted for movement.
Claim 6
Dependent Claim
17 words
A diaphragm as in claim 1, wherein said undulations extend over only a portion of the edges.
Claim 7
Dependent Claim
23 words
A diaphragm as in claim 5, wherein said blades are sickle shaped and the edges are on the interior of the sickle shape.
Claim 8
Dependent Claim
79 words
A diaphragm as in claim 5, wherein said blades are movable to vary the aperture from a size smaller than a given size to a size larger than the given size and wherein the edges outside the undulations are substantially continuous, said blades exposing only the undulations in the aperture when the aperture is less than the given size and exposing the undulations and the continuous portion of the edges when the aperture is larger than the given size.
Claim 9
Dependent Claim
31 words
A diaphragm as in claim 1, wherein said edges include a portion having the undulations and a continuous portion, the continuous portion extending substantially along the average values of the undulations.
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) | 1975-07-11 | 1976-01-10 | 1976-07-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-07-11 | 1980-01-10 | 1980-07-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-07-11 | 1984-01-10 | 1984-07-11 | $7700.00 | Window Closed / Lapsed |