US3668995A - Iris diaphragm with extra leaf for complete closure - Google Patents

Iris diaphragm with extra leaf for complete closure Download PDF

Info

Publication number
US3668995A
US3668995A US886425A US3668995DA US3668995A US 3668995 A US3668995 A US 3668995A US 886425 A US886425 A US 886425A US 3668995D A US3668995D A US 3668995DA US 3668995 A US3668995 A US 3668995A
Authority
US
United States
Prior art keywords
leaf
leaves
iris
diaphragm
ring
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US886425A
Other languages
English (en)
Inventor
Klaus Bardutzky
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Jos Schneider Optische Werke GmbH
Original Assignee
Jos Schneider Optische Werke GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Jos Schneider Optische Werke GmbH filed Critical Jos Schneider Optische Werke GmbH
Application granted granted Critical
Publication of US3668995A publication Critical patent/US3668995A/en
Assigned to JOS. SCHNEIDER OPTISCHE WERKE AKTIENGESELLSCHAFT reassignment JOS. SCHNEIDER OPTISCHE WERKE AKTIENGESELLSCHAFT CHANGE OF NAME (SEE DOCUMENT FOR DETAILS). EFFECTIVE JULY 30, 1981 Assignors: JOS. SCHNEIDER GMBH & CO. OPTISCHE WERKE
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B9/00—Exposure-making shutters; Diaphragms
    • G03B9/08—Shutters

Definitions

  • German v P 18 l 5 349 6 further includes an extra leaf pivoted to the mounting ring and y coupled with one of the control leaves through a pin engaging 52 U.s. Cl. ..95/64 R L5MPed whereby in a limited inwardly swung [51] 9/06 position of the iris leaves, further rotation of the setting ring 58 Field of Search ..95/63, 64 R Cams the extra leafinto a p Position obstructing the residual aperture. [5 6] Referenes med 7 Claim, 4 Drawing Figures UNITED STATES PATENTS 622,592 4/1899 Berger ..95/64 R PATENTEDJUH13 m2 I 3,668,995
  • My present invention relates to an iris diaphragm for photographic, cinematographic or television cameras.
  • iris diaphragms include a pair of relatively rotatable coaxial rings, generally a fixed mounting ring and an adjustable setting ring, as well as a set of peripherally equispaced iris leaves which are jointly swung toward or away from the ring axis upon relative rotation of the rings in one sense or the other to narrow or to widen a central aperture defined by inner edge portions of these leaves.
  • the swing of the iris leaves is brought about by advantageously leaf-shaped control elements which are articulated to respective iris leaves while being pivoted to the setting ring, the iris leaves in turn being pivoted to the mounting ring.
  • the pivot of any control leaf lies substantially opposite its point of articulation to the associated iris leaf so that further rotation of the setting ring beyond this terminal position will not bring the iris leaves closer to the axis.
  • This terminal ring position therefore, coincides with 'a limiting leaf position in which the diaphragm aperture has reached an irreducible minimum.
  • the general object of my present invention is to provide an improved diaphragm of this type having means for completely closing the iris aperture, e.g.'for the purpose of allowing the testing of the camera shutter without exposing the film or for protecting the photocathode of a television camera from glare.
  • a more specific object of this invention is to provide means in such iris diaphragm enabling complete closure to be achieved with relatively little effort.
  • the coupling formations are a slot on the extra leaf and a pin on the coacting control element, the slot preferably having two angularly adjoining sections whose vertex is occupied by the pin in the terminal ring position to accelerate the inward swing of the extra lead upon further rotation.
  • the slot may be substantially L-shaped and so positioned that the pin, when engaging the shorter leg of the L during the closure movement, exerts a camming effect whereby only a small additional fraction of a turn will suflice to obstruct the diaphragm aperture.
  • the iris diaphragm shown in the drawing comprises a fixed mounting ring 5 and a rotatable setting ring 7 (shown only in part) centered on a common axis 0.
  • the assembly further includes an extra leaf 8 (see also FIG. 4) pivoted at 9 to the fixed ring 5 and provided with an L-shaped camming slot 10 engaged by a pin 11 which carried on the control leaf 2 illustrated in FIGS. 1 3.
  • Slot 10 has a longer section or leg A-B and a shorter section or leg B-C; it will be noted, particuthe leg A-B includes an acute angle with a line 2 passing through pivot 9 and vertex B whereas the leg B-C includes an obtuse angle with that line.
  • the location of vertex B is so chosen that pin 11, sliding in leg A-B during the inward swing of the iris leaves from their wide-open position of FIG. 1, reaches that vertex in the terminal position of FIG.
  • pivots 4 and 9 will be seen to lie substantially on a common diameter with the point of articulation 3 between the iris leaf 1 and the control leaf 2 carrying the pin 11.
  • the contours of the iris leaves and of the extra leaf 8 are so chosen that, up to that point, leaf 8 never obstructs the aperture defined by the edge portions of leaves 1 remote from their pivots 6.
  • the angle a defined by pivots 6 and 9 with the optical axis 0, determines the rotary position in which the pin 11 reaches the vertex B so that the stroke of leaf 8 may be modified by whence it will be apparent that five iris leaves along with five articulated at a hinge point 3 to varying thisangle.
  • a displaceable mounting of pivot 9- and pin 11 enables adjustment of that angle.
  • An iris diaphragm comprising a first ring and a second ring centered on a common axis for relative rotation; a set of iris leaves pivoted at peripherally spaced locations to said first ring; a set of control leaves pivoted at peripherally spaced locations to said second ring, each control leaf being articulated to a respective iris leaf for swinging same, upon relative rotation of said rings in a predetermined direction, toward said axis into a limiting position in which edge portions of said iris leaves remote from their pivots define a restricted aperture; and an extra leaf pivoted to said first ring, one of said control leaves being provided with a pin and said extra leaf being proobstructing said restricted aperture upon relative rotation of said rings in said direction beyond a terminal position corresponding to said limiting position of said iris leaves.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Diaphragms For Cameras (AREA)
US886425A 1968-12-18 1969-12-18 Iris diaphragm with extra leaf for complete closure Expired - Lifetime US3668995A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19681815349 DE1815349A1 (de) 1968-12-18 1968-12-18 Blende mit mehreren bogenfoermigen,durch ein Gelenk miteinander verbundenen Lamellenpaaren

Publications (1)

Publication Number Publication Date
US3668995A true US3668995A (en) 1972-06-13

Family

ID=5716575

Family Applications (1)

Application Number Title Priority Date Filing Date
US886425A Expired - Lifetime US3668995A (en) 1968-12-18 1969-12-18 Iris diaphragm with extra leaf for complete closure

Country Status (2)

Country Link
US (1) US3668995A (de)
DE (1) DE1815349A1 (de)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3836234A (en) * 1972-05-17 1974-09-17 Rank Organisation Ltd Fully closing iris diaphragm
US3883886A (en) * 1973-02-26 1975-05-13 Rollei Werke Franke Heidecke Photographic diaphragm and camera
US4272175A (en) * 1978-11-14 1981-06-09 Asahi Kogaku Kogyo Kabushiki Kaisha Automatic aperture control device
US5394212A (en) * 1992-07-23 1995-02-28 Fuji Photo Optical Co., Ltd. Diaphragm with light blocking element
US20040174616A1 (en) * 2003-03-03 2004-09-09 Leica Microsystems Wetzlar Gmbh Iris diaphragm device

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2316812C2 (de) * 1973-04-04 1982-10-21 Rollei-Werke Franke & Heidecke Gmbh & Co Kg, 3300 Braunschweig "Fotografische Blende für eine Stehbildkamera"

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3836234A (en) * 1972-05-17 1974-09-17 Rank Organisation Ltd Fully closing iris diaphragm
US3883886A (en) * 1973-02-26 1975-05-13 Rollei Werke Franke Heidecke Photographic diaphragm and camera
US4272175A (en) * 1978-11-14 1981-06-09 Asahi Kogaku Kogyo Kabushiki Kaisha Automatic aperture control device
US5394212A (en) * 1992-07-23 1995-02-28 Fuji Photo Optical Co., Ltd. Diaphragm with light blocking element
US20040174616A1 (en) * 2003-03-03 2004-09-09 Leica Microsystems Wetzlar Gmbh Iris diaphragm device
US6980376B2 (en) 2003-03-03 2005-12-27 Leica Microsystems Wetzlar Gmbh Iris diaphragm device

Also Published As

Publication number Publication date
DE1815349A1 (de) 1970-06-25

Similar Documents

Publication Publication Date Title
US3978503A (en) Light shield mechanism for quadrilateral opening
US3668995A (en) Iris diaphragm with extra leaf for complete closure
US6912097B2 (en) Iris diaphragm
US3906529A (en) Zoom lens mechanism
US2222298A (en) Adjustable diaphragm
US4415242A (en) Camera lens cover and sunshade apparatus
US4229074A (en) Zoom lens assembly for photographic cameras
US4199247A (en) Photographic diaphragm with two independent sets of leaves
US2580324A (en) Camera diaphragm mechanism
US3798670A (en) Camera focusing mechanism
US4206988A (en) Viewfinder for single lens reflex cameras
US3687047A (en) Interchangeable lens capable of change over between automatic and manual stop operations
US2372430A (en) Camera
US3766841A (en) Method and apparatus for extending the exposure range for camera lenses
US1775180A (en) Light screen for the lens of photographic cameras
US1973542A (en) Photographic copying attachment
US3005392A (en) Camera capable of being set for different types of operation
US2421746A (en) Masking attachment for photographic cameras
US2821891A (en) Diaphragm for photographic cameras
US1755175A (en) Dowser or diaphragm for motion-picture apparatus
US1750830A (en) Vignetting shutter
US1900730A (en) Camera back
US2176679A (en) Photographic camera
US3685418A (en) Iris diaphragm and blade therefor
US3208366A (en) Shutter-diaphragm assemblies for photographic devices

Legal Events

Date Code Title Description
AS Assignment

Owner name: JOS. SCHNEIDER OPTISCHE WERKE AKTIENGESELLSCHAFT

Free format text: CHANGE OF NAME;ASSIGNOR:JOS. SCHNEIDER GMBH & CO. OPTISCHE WERKE;REEL/FRAME:003925/0522

Effective date: 19810730