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GB859126A - Improvements in and relating to variable aperture masking plate assemblies for optical projectors or cameras - Google Patents

Improvements in and relating to variable aperture masking plate assemblies for optical projectors or cameras

Info

Publication number
GB859126A
GB859126A GB2264857A GB2264857A GB859126A GB 859126 A GB859126 A GB 859126A GB 2264857 A GB2264857 A GB 2264857A GB 2264857 A GB2264857 A GB 2264857A GB 859126 A GB859126 A GB 859126A
Authority
GB
United Kingdom
Prior art keywords
aperture
plate
base plate
shutter
cameras
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
Application number
GB2264857A
Inventor
Albert Stanley Pratt
John Frederick William Barclay
Raymond Hillery Camp
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.)
RANK PREC IND B A F Ltd
Original Assignee
RANK PREC IND B A F Ltd
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 RANK PREC IND B A F Ltd filed Critical RANK PREC IND B A F Ltd
Priority to GB2264857A priority Critical patent/GB859126A/en
Publication of GB859126A publication Critical patent/GB859126A/en
Expired legal-status Critical Current

Links

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
    • G03B21/00—Projectors or projection-type viewers; Accessories therefor
    • G03B21/14—Details
    • G03B21/32—Details specially adapted for motion-picture projection

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Projection Apparatus (AREA)

Abstract

859,126. Optical apparatus. RANK PRECISION INDUSTRIES (B.A.F.) Ltd. July 17, 1957, No. 22648/57. Classes 97(1) and 98(1) A variable aperture masking plate particularly for motion picture projectors or cameras comprises a base plate having a fixed aperture and two shutter members slidably supported on said base plate, each shutter member including a limb extending to the boundary of the base plate whereat it is connected to mechanism for urging the limbs in opposite directions to vary the effective aperture. As shown, a base plate 1 has an aperture 2 behind which are slidably mounted the two L-shaped shutters 3 and 4. The long sides of each shutter are mounted in a groove 5 milled in the back of the plate. A screw thread 6 having a knurled knob 13 is mounted within a housing 7 and carries a left hand threaded nut 9 attached to the long limb of the shutter member 4 and a right hand threaded nut 8 attached to the shutter member 3 and a spiral spring 10 located between the nuts to urge them apart. Thus rotation of the knob 13 in either direction serves to vary the length of one side of the aperture 2, the shutters being urged against the plate 1 by springs 11 and 12. In a further embodiment, the relative motion between the shutters is effected by the rotation of a pivoted arcuate plate which is attached to F-shaped shutter members on either side of the pivot. The mask is intended to adapt motion picture cameras or projectors to image formats of differing size.
GB2264857A 1957-07-17 1957-07-17 Improvements in and relating to variable aperture masking plate assemblies for optical projectors or cameras Expired GB859126A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB2264857A GB859126A (en) 1957-07-17 1957-07-17 Improvements in and relating to variable aperture masking plate assemblies for optical projectors or cameras

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB2264857A GB859126A (en) 1957-07-17 1957-07-17 Improvements in and relating to variable aperture masking plate assemblies for optical projectors or cameras

Publications (1)

Publication Number Publication Date
GB859126A true GB859126A (en) 1961-01-18

Family

ID=10182849

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2264857A Expired GB859126A (en) 1957-07-17 1957-07-17 Improvements in and relating to variable aperture masking plate assemblies for optical projectors or cameras

Country Status (1)

Country Link
GB (1) GB859126A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4987436A (en) * 1986-09-02 1991-01-22 Asahi Kogaku Kogyo Kabushiki Kaisha Camera image plane size control device
GB2264179A (en) * 1992-02-12 1993-08-18 Asahi Optical Co Ltd Apparatus for changing the size of the photographing aperture in a camera

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4987436A (en) * 1986-09-02 1991-01-22 Asahi Kogaku Kogyo Kabushiki Kaisha Camera image plane size control device
GB2235542A (en) * 1986-09-02 1991-03-06 Asahi Optical Co Ltd Camera image size control device
US5010357A (en) * 1986-09-02 1991-04-23 Asahi Kogaku Kogyo Kabushiki Kaisha Camera image plane size control device
GB2235542B (en) * 1986-09-02 1991-07-24 Asahi Optical Co Ltd Camera having image plane size control device
GB2264179A (en) * 1992-02-12 1993-08-18 Asahi Optical Co Ltd Apparatus for changing the size of the photographing aperture in a camera
US5335031A (en) * 1992-02-12 1994-08-02 Asahi Kogaku Kogyo Kabushiki Kaishi Apparatus for changing the size of the photographing aperture in a camera
GB2264179B (en) * 1992-02-12 1996-01-17 Asahi Optical Co Ltd Apparatus for changing the size of the photographing aperture in a camera

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