US3727531A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Iris diaphragm with linear aperture scale
Assignee: Jos Schneider Optische Werke GmbH
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Filing: 1972-06-21
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Granted: 1973-04-17
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Expires: 1992-06-21
Abstract
Abstract An iris diaphragm provided with a fixed mounting ring and a rotatable setting ring coplanar therewith has a multiplicity of angularly equispaced iris-leaf pairs each including a main leaf and an ancillary leaf articulated to each other at one end, the free opposite ends of the two leaves being respectively fulcrumed on the mounting ring and on the setting ring confronting the same side of the leaves. The generally crescent-shaped ancillary leaf has an arcuate inner edge with a radius of curvature substantially corresponding to the maximum radius of the diaphragm aperture; the main leaf may be of similar configuration of may have a generally elbow-shaped contour.
Inventors
- 👤 A Baab
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 14:21
CPC Classifications
G; G03; G03B; G03B9/00; G03B9/08
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
126 words
An iris diaphragm comprising: a first ring and a second ring respectively forming an inner annular land and an outer annular land substantially flush in a plane transverse to a common axis thereof, said rings being relatively rotatable about said axis; and a plurality of iris-leaf pairs on one side of said plane each including a main leaf with an end pivoted to said inner land and an ancillary leaf with an end pivoted to said outer land, the opposite ends of said leaves being articulated to each other and projecting inwardly toward said axis in a first relative angular position of said rings by lying alongside said inner land in a second relative angular position of said leaves, thereby defining minimum and maximum aperture stops.
Claim 2
Dependent Claim
126 words
An iris diaphragm comprising: a first ring and a second ring respectively forming an inner annular land and an outer annular land substantially flush in a plane transverse to a common axis thereof, said rings being relatively rotatable about said axis; and a plurality of iris-leaf pairs on one side of said plane each including a main leaf with an end pivoted to said inner land and an ancillary leaf with an end pivoted to said outer land, the opposite ends of said leaves being articulated to each other and projecting inwardly toward said axis in a first relative angular position of said rings by lying alongside said inner land in a second relative angular position of said leaves, thereby defining minimum and maximum aperture stops.
Claim 3
Dependent Claim
32 words
An iris diaphragm as defined in claim 1 wherein said first ring forms part of an annular diaphragm mounting having an annular peripheral recess, said second ring being seated in said recess.
Claim 4
Dependent Claim
28 words
An iris diaphragm as defined in claim 2 wherein said mounting is provided with a removable annular cover overlying said leaves on the side remote from said lands.
Claim 5
Dependent Claim
36 words
An iris diaphragm as defined in claim 1 wherein said ancillary leaf is generally crescent-shaped with an arcuate concave edge whose radius of curvature substantially equals the radius of the inner periphery of said first ring.
Claim 6
Dependent Claim
35 words
An iris diaphragm as defined in claim 4 wherein said main leaf is generally crescent-shaped with an arcuate concave edge of substantially the same radius of curvature as the concave edge of said ancillary leaf.
Claim 7
Dependent Claim
27 words
An iris diaphragm as defined in claim 5 wherein the number of said iris-leaf pairs is four, the pivots of corresponding leaves thereof being spaced 90* apart.
Claim 8
Dependent Claim
54 words
An iris diaphragm as defined in claim 4 wherein said main leaf is generally elbow-shaped with an angularly bent inner edge having a substantially straight portion, a convex portion generally perpendicular thereto and a substantially linear portion near the articulated end thereof, the latter portion including an obtuse angle with said substantially straight portion.
Claim 9
Dependent Claim
29 words
An iris diaphragm as defined in claim 7 wherein the concave edge of said ancillary leaf cuts across said angularly bent inner edge in said second relative angular position.
Claim 10
Dependent Claim
27 words
An iris diaphragm as defineD in claim 7 wherein the number of said iris-leaf pairs is five, the pivots of corresponding leaves thereof being spaced 72* apart.
Claim 11
Dependent Claim
37 words
An iris diaphragm as defined in claim 1 wherein the articulated end of the leaves of each pair overlap the pivoted ends of the leaves of an adjoining pair in imbricated relationship in said second angular 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) | 1976-04-16 | 1976-10-16 | 1977-04-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-04-16 | 1980-10-16 | 1981-04-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-04-16 | 1984-10-16 | 1985-04-17 | $7700.00 | Window Closed / Lapsed |