GB851487A - Optical finders - Google Patents

Optical finders

Info

Publication number
GB851487A
GB851487A GB14490/57A GB1449057A GB851487A GB 851487 A GB851487 A GB 851487A GB 14490/57 A GB14490/57 A GB 14490/57A GB 1449057 A GB1449057 A GB 1449057A GB 851487 A GB851487 A GB 851487A
Authority
GB
United Kingdom
Prior art keywords
image
plane
biprismatic
objective
dihedral edge
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
GB14490/57A
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.)
Societe dOptique et de Mecanique de Haute Precision
Original Assignee
Societe dOptique et de Mecanique de Haute Precision
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 Societe dOptique et de Mecanique de Haute Precision filed Critical Societe dOptique et de Mecanique de Haute Precision
Publication of GB851487A publication Critical patent/GB851487A/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B23/00—Telescopes, e.g. binoculars; Periscopes; Instruments for viewing the inside of hollow bodies; Viewfinders; Optical aiming or sighting devices
    • G02B23/14—Viewfinders

Landscapes

  • Physics & Mathematics (AREA)
  • Astronomy & Astrophysics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Viewfinders (AREA)
  • Telescopes (AREA)

Abstract

851,487. Optical apparatus. SOC. D'OPTIQUE ET DE MECANIQUE DE HAUTE PRECISION. May 7,1957 [May 11, 1956], No. 14490/57. Classes 97(1) and 98(1) An optical-image finder includes an image forming system, and a biprismatic body located in the region where the image is formed and having its dihedral edge substantially perpendicular to the axial ray through the system, and focussing means for causing relative movement of the dihedral edge and the image parallel to the axial ray so that the image viewed through the biprismatic body appears duplicated unless the dihedral edge lies substantially in the image plane. Fig. 1 shows a biprism 4 on a support 6 slidable in a tube 7 adjacent the image plane of an objective 1 and an eyepiece 2 for viewing the image. The position at which the dihedral edge 5 coincides with the image is shown on a Scale II which may give directly the range of the object imaged. The biprismatic body may be employed in a reflex type camera and for this purpose may be carried on the plane face of a plane-convex field lens. Alternatively the objective may be moved to effect focussing and may be coupled directly to a camera objective. The biprismatic body may be of the form shown in Fig. 6 or may be in the form of a plane parallel plate wedge shaped at one end.
GB14490/57A 1956-05-11 1957-05-07 Optical finders Expired GB851487A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR851487X 1956-05-11

Publications (1)

Publication Number Publication Date
GB851487A true GB851487A (en) 1960-10-19

Family

ID=9323616

Family Applications (1)

Application Number Title Priority Date Filing Date
GB14490/57A Expired GB851487A (en) 1956-05-11 1957-05-07 Optical finders

Country Status (1)

Country Link
GB (1) GB851487A (en)

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