GB878236A - Lens shade - Google Patents

Lens shade

Info

Publication number
GB878236A
GB878236A GB9913/60A GB991360A GB878236A GB 878236 A GB878236 A GB 878236A GB 9913/60 A GB9913/60 A GB 9913/60A GB 991360 A GB991360 A GB 991360A GB 878236 A GB878236 A GB 878236A
Authority
GB
United Kingdom
Prior art keywords
aperture
camera
lens
maximum dimension
plate
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
GB9913/60A
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.)
Polaroid Corp
Original Assignee
Polaroid Corp
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 Polaroid Corp filed Critical Polaroid Corp
Publication of GB878236A publication Critical patent/GB878236A/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

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Blocking Light For Cameras (AREA)

Abstract

878,236. Lens hoods. INTERNATIONAL POLAROID CORPORATION. March 21, 1960 [April 2, 1959], No. 9913/60. Class 98(1) An aperture defining and shading device for a camera comprises a member, with an aperture for aligning with a camera lens, which carries a second apertured shading member movable towards the first member from a position in which the second member is aligned with and spaced a predetermined distance from the first aperture. The device shown in Fig. 1 comprises a base plate 26 having a flange 28 for attachment to the camera and an aperture 30. Fixed to or integral with this base is one end 38 of a curved sheet 36 of resilient material having an aperture 44 therein which is normally spaced a distance d from the aperture 30, which distance is determined by the equation A = a+d (L/F), where A is the maximum dimension of aperture 44; a is the maximum dimension of aperture 30; FÀis the focal length of the camera objective; L is the maximum dimension of the image formed by said lens in its focal plane. The shapes of plate 36 and of the apertures 30, 44 may vary, e.g. the plate may be elliptical and the apertures may be rectangular. Filters &c. may be attached to the base plate. In Fig. 4 the device is pivoted to a bellows-type camera at 54 and is spring urged into the position shown or into a position in front of the lens.
GB9913/60A 1959-04-02 1960-03-21 Lens shade Expired GB878236A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US878236XA 1959-04-02 1959-04-02

Publications (1)

Publication Number Publication Date
GB878236A true GB878236A (en) 1961-09-27

Family

ID=22207464

Family Applications (1)

Application Number Title Priority Date Filing Date
GB9913/60A Expired GB878236A (en) 1959-04-02 1960-03-21 Lens shade

Country Status (1)

Country Link
GB (1) GB878236A (en)

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