GB821605A - Improvements in or relating to light-control devices for cameras - Google Patents

Improvements in or relating to light-control devices for cameras

Info

Publication number
GB821605A
GB821605A GB3598154A GB3598154A GB821605A GB 821605 A GB821605 A GB 821605A GB 3598154 A GB3598154 A GB 3598154A GB 3598154 A GB3598154 A GB 3598154A GB 821605 A GB821605 A GB 821605A
Authority
GB
United Kingdom
Prior art keywords
discs
opacity
opposite directions
density
dec
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
GB3598154A
Inventor
Donald Jackson
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.)
Pye Electronic Products Ltd
Original Assignee
Pye 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 Pye Ltd filed Critical Pye Ltd
Priority to GB3598154A priority Critical patent/GB821605A/en
Publication of GB821605A publication Critical patent/GB821605A/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
    • G03B17/00—Details of cameras or camera bodies; Accessories therefor
    • G03B17/02—Bodies
    • G03B17/12—Bodies with means for supporting objectives, supplementary lenses, filters, masks, or turrets
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/20—Filters
    • G02B5/205—Neutral density filters
    • 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
    • G03B19/00—Cameras
    • G03B19/18—Motion-picture cameras

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Blocking Light For Cameras (AREA)
  • Mechanical Light Control Or Optical Switches (AREA)

Abstract

821,605. Optical filters. PYE Ltd. Dec. 13, 1955 [Dec. 13. 1954]. No. 35981/54. Classes 97(1) and 98(1) A variable density light filter particularly for use in television cameras consists of two discs or elongated plates mounted one behind the other each element having a density which varies continuously along or around it from a maximum to a minimum value the two elements being so arranged that their densities vary in opposite directions and a drive being provided to move the elements in opposite directions to increase or decrease simultaneously the main density of that part of each element through which the light passes. Fig. 1 shows a portion of a television camera comprising a lens turret plate 16 rotatable on bearings 26, 27, 28 and two graded opacity discs 1, 2 rotatable on a bearing 32 and respectively having gear teeth 5, 6. The discs are arranged as shown in Fig. 2 so that the opacity of one increases in the direction in which the opacity in the other decreases the discs being driven simultaneously in opposite directions by gearing operated by a driving shaft 9 controlled by a potentiometer 21 having microswitches to prevent the dividing line between the opacities of the two discs from entering the lens aperture 17. A gear 18 operated by a spindle 19 adjusts simultaneously the iris diaphragms of the lenses held by the plate 16 as described in Specifications 670,581 and 706,922. Specifications 693,385, 699,104 and 723,872 also are referred to.
GB3598154A 1954-12-13 1954-12-13 Improvements in or relating to light-control devices for cameras Expired GB821605A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB3598154A GB821605A (en) 1954-12-13 1954-12-13 Improvements in or relating to light-control devices for cameras

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB3598154A GB821605A (en) 1954-12-13 1954-12-13 Improvements in or relating to light-control devices for cameras

Publications (1)

Publication Number Publication Date
GB821605A true GB821605A (en) 1959-10-14

Family

ID=10383644

Family Applications (1)

Application Number Title Priority Date Filing Date
GB3598154A Expired GB821605A (en) 1954-12-13 1954-12-13 Improvements in or relating to light-control devices for cameras

Country Status (1)

Country Link
GB (1) GB821605A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3185053A (en) * 1962-09-05 1965-05-25 Emil S Wieszeck Camera light control mechanism
FR2615009A1 (en) * 1987-05-06 1988-11-10 Angenieux P Ets Variable-opacity attenuator for camera objective
EP0658244A1 (en) * 1992-05-22 1995-06-21 Panavision International, L.P. System for varying light intensity such as for use in motion picture photography
EP0678701A1 (en) * 1994-03-25 1995-10-25 Panavision International, L.P. System for varying light intensity such as for use in motion picture photography

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3185053A (en) * 1962-09-05 1965-05-25 Emil S Wieszeck Camera light control mechanism
FR2615009A1 (en) * 1987-05-06 1988-11-10 Angenieux P Ets Variable-opacity attenuator for camera objective
EP0658244A1 (en) * 1992-05-22 1995-06-21 Panavision International, L.P. System for varying light intensity such as for use in motion picture photography
EP0658244A4 (en) * 1992-05-22 1995-09-27 Panavision Int Lp System for varying light intensity such as for use in motion picture photography.
US5515119A (en) * 1992-05-22 1996-05-07 Panavision International, L.P. System for varying light intensity such as for use in motion picture photography
EP0678701A1 (en) * 1994-03-25 1995-10-25 Panavision International, L.P. System for varying light intensity such as for use in motion picture photography

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