Patent US3785265A successfully refreshed from Google Patents.
US3785265A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Iris diaphragm
Assignee: Societe dOptique Precision Electronique et Mecanique SOPELEM SA
•
Filing: 1973-05-25
•
Granted: 1974-01-15
•
Expires: 1993-05-25
Abstract
Abstract An iris diaphragm includes shutter blades moved by a conventional control member during a first phase of adjustment to reduce the aperture to a size at which diffraction effects are still unimportant. In a second phase of adjustment the shutter blades are stationary and a transparent support member is moved to introduce increasingly dense portions of a graduated filter into the optical path. Light control over a range of 1:1,000,000 may thus be obtained. There may follow a third phase in which the shutter blades again move to reduce the aperture to zero. The blades and the filter support may be placed on opposite sides of a permanent stop and actuated by respective control members coupled to a common setting ring. Alternatively the blades and filter support may be on the same side of the stop and actuated by a common control member. The filter support may be introduced into the optical path only after the first phase has ended, or a transparent portion thereof may be always in the optical path, the filter-carrying portion being brought into action only during the second phase.
Inventors
- 👤 J Lardeau
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 15:40
CPC Classifications
G; G03; G03B; G03B9/00; G03B9/08; G03B19/00; G03B19/18
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
155 words
In iris diaphragm means, in combination: casing means defining an aperture in an optical path; control means mounted for movement with respect to said casing means; a plurality of iris blades pivoted to the casing means; iris drive means coupling said iris blades with said control means whereby in response to a first phase of movement of said control means said blades progressively reduce said aperture to a predetermined size and remain stationary during a second phase of movement of said control means succeeding to said first phase; a transparent filter support member pivoted to said casing means; a graduated-density filter on said support member whereby predetermined pivotal movement of said support member introduces increasingly dense portions of said filter into said aperture; filter drive means coupling said support member with said control means whereby said pivotal movement of said support member is produced in response to said second movement phase of said control means.
Claim 2
Dependent Claim
155 words
In iris diaphragm means, in combination: casing means defining an aperture in an optical path; control means mounted for movement with respect to said casing means; a plurality of iris blades pivoted to the casing means; iris drive means coupling said iris blades with said control means whereby in response to a first phase of movement of said control means said blades progressively reduce said aperture to a predetermined size and remain stationary during a second phase of movement of said control means succeeding to said first phase; a transparent filter support member pivoted to said casing means; a graduated-density filter on said support member whereby predetermined pivotal movement of said support member introduces increasingly dense portions of said filter into said aperture; filter drive means coupling said support member with said control means whereby said pivotal movement of said support member is produced in response to said second movement phase of said control means.
Claim 3
Dependent Claim
56 words
The invention claimed in claim 1 wherein said iris drive means further responds to a third phase of movement of said control means, following said second phase, by actuating said iris blades progressively to close said aperture, said filter control means being arranged to hold said filter support member stationary during said third phase of movement.
Claim 4
Dependent Claim
88 words
The invention claimed in claim 1 wherein said casing means includes a hollow cylindrical portion having medially therein a transverse, centrally apertured portion defining a fixed stop in said optical path, wherein said iris blades are pivoted upon one face of said apertured portion and said iris drive means includes a plurally slotted annular iris drive member mounted for rotating movement within said cylindrical casing portion and wherein said iris blades each have a respective drive pin engaging in a respective one of said iris drive member slots.
Claim 5
Dependent Claim
66 words
The invention claimed in claim 3 wherein said filter support member is pivoted at a point upon the face of said apertured casing portion opposite to said one face, wherein said filter drive means includes a slotted annular filter drive member mounted for rotating movement within said cylindrical casing portion and said filter support member has a drive pin engaged in said filter drive member slot.
Claim 6
Dependent Claim
63 words
The invention claimed in claim 4 wherein said control means includes a setting ring surrounding said cylindrical casing portion for rotating movement thereabout; said casing portion includes peripherally extending slots and each of said iris drive member and said filter drive member is driving coupled with said setting ring by a respective coupling pin extending radially through a respective one of said slots.
Claim 7
Dependent Claim
96 words
The invention claimed in claim 1 wherein said casing means includes a hollow cylindrical portion having therein a transverse centrally apertured portion defining a fixed stop in said optical path, wherein said iris blades and said filter support member are pivoted upon the same face of said apertured casing portion, and wherein said drive means includes a common plurally slotted drive member mounted for rotating movement within said cylindrical casing portion, each of said iris blades and said filter support member having a respective drive pin engaged in a respective one of said driving member slots.
Claim 8
Dependent Claim
61 words
The invention claimed in claim 4 wherein said graduated-density filter is bounded by circular arcs centred at said pivot point, wherein the width of said filter is slightly greater than the diameter of said iris aperture of said predetermined size and wherein the mean radius of said filter is equal to the distance from said pivot point to said optical axis.
Claim 9
Dependent Claim
58 words
The invention claimed in claim 1 wherein said filter support member has a form similar to that of said iris blades, said filter drive means actuating said filter support member for movement simultaneously with said iris blades during said first phase of movement and producing said predetermined movement of said support member during said second phase or movement.
Claim 10
Dependent Claim
72 words
The invention claimed in claim 1 wherein a portion of said transparent filter support member is always disposed in said optical path, wherein at the commencement of said first phase of movement the least dense portions of said filter are disposed within the iris aperture, and wherein said filter drive means is arranged to produce said predetermined movement of said filter support member only after termination of said first phase of movement.
Claim 11
Dependent Claim
81 words
The invention claimed in claim 1 wherein a portion of said transparent filter support is always disposed in said optical path, wherein said filter drive means is arranged during said first phase of movement to cause said filter support member to move together with said iris blades, whereby said filter remains outside the iris aperture during this phase of movement, and wherein during said second phase of movement said filter drive means produces said predetermined movement of said filter support member.
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) | 1977-01-14 | 1977-07-16 | 1978-01-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-01-14 | 1981-07-16 | 1982-01-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-01-14 | 1985-07-16 | 1986-01-15 | $7700.00 | Window Closed / Lapsed |