GB1477560A - Viewfinder system for single lens reflex cameras - Google Patents

Viewfinder system for single lens reflex cameras

Info

Publication number
GB1477560A
GB1477560A GB3960375A GB3960375A GB1477560A GB 1477560 A GB1477560 A GB 1477560A GB 3960375 A GB3960375 A GB 3960375A GB 3960375 A GB3960375 A GB 3960375A GB 1477560 A GB1477560 A GB 1477560A
Authority
GB
United Kingdom
Prior art keywords
prism
eye
view
piece
finder
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
GB3960375A
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.)
Pentax Corp
Original Assignee
Asahi Kogaku Kogyo Co 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 Asahi Kogaku Kogyo Co Ltd filed Critical Asahi Kogaku Kogyo Co Ltd
Publication of GB1477560A publication Critical patent/GB1477560A/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
    • G03B19/00—Cameras
    • G03B19/02—Still-picture cameras
    • G03B19/12—Reflex cameras with single objective and a movable reflector or a partly-transmitting mirror
    • 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)
  • General Physics & Mathematics (AREA)
  • Astronomy & Astrophysics (AREA)
  • Optics & Photonics (AREA)
  • Viewfinders (AREA)
  • Optical Elements Other Than Lenses (AREA)
  • Exposure Control For Cameras (AREA)

Abstract

1477560 View-finders ASAHI KOGAKU KOGYO KK 26 Sept 1975 [30 Sept 1974] 39603/75 Heading G2J A view-finder having an eye-piece 12 includes a prism having entry and exit faces disposed at 45 degrees to each other and perpendicular to the optical axis of the view-finder, the prism being shaped so as to reflect an incoming perpendicular beam in a direction perpendicular to the exit face. As shown in Fig. 3, the view-finder includes two such prisms 9, 11, the prism 9 being a leaf prism. The prism 11 and eye-piece 12 are mounted in a housing 10 which is rotatably supported on a housing 7 of the prism 9 so that the eye-piece 12 may be moved from an eye-level viewing position to a waist-level viewing position.
GB3960375A 1974-09-30 1975-09-26 Viewfinder system for single lens reflex cameras Expired GB1477560A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP49112561A JPS5139120A (en) 1974-09-30 1974-09-30

Publications (1)

Publication Number Publication Date
GB1477560A true GB1477560A (en) 1977-06-22

Family

ID=14589744

Family Applications (1)

Application Number Title Priority Date Filing Date
GB3960375A Expired GB1477560A (en) 1974-09-30 1975-09-26 Viewfinder system for single lens reflex cameras

Country Status (5)

Country Link
JP (1) JPS5139120A (en)
DE (2) DE2559601C3 (en)
FR (1) FR2286395A1 (en)
GB (1) GB1477560A (en)
ZA (1) ZA755710B (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1715379A3 (en) * 2005-04-18 2007-06-20 Leica Camera Aktiengesellschaft Angle converter for the viewfinder of a rangefinder camera

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS54143633A (en) * 1978-04-28 1979-11-09 Asahi Optical Co Ltd Interchangeable contact lens mirror barrel
JPS60263101A (en) * 1984-06-11 1985-12-26 Canon Inc Finder optical system
JPS616601A (en) * 1984-06-20 1986-01-13 Canon Inc Finder optical system
JPS60233630A (en) * 1984-05-07 1985-11-20 Canon Inc Finder optical system
JPS616804U (en) * 1984-06-18 1986-01-16 キヤノン株式会社 Prism for finder
JPS60233628A (en) * 1984-05-07 1985-11-20 Canon Inc Finder optical system
JPS616803U (en) * 1984-06-18 1986-01-16 キヤノン株式会社 Prism for finder
JPH0381749A (en) * 1989-08-25 1991-04-08 Olympus Optical Co Ltd Real image type finder
DE4345554B4 (en) * 1992-09-11 2007-09-13 Canon K.K. Two-prism viewfinder for photographic or video camera - produces real image in neighbourhood of frame inserted between adjacent faces of polygonal and triangular prisms
JPH07198914A (en) * 1993-12-28 1995-08-01 Asahi Optical Co Ltd Prism and finder provided with it

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5117468B2 (en) * 1972-06-19 1976-06-02

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1715379A3 (en) * 2005-04-18 2007-06-20 Leica Camera Aktiengesellschaft Angle converter for the viewfinder of a rangefinder camera

Also Published As

Publication number Publication date
DE2543160A1 (en) 1976-04-01
ZA755710B (en) 1976-08-25
DE2543160B2 (en) 1977-06-30
DE2559601A1 (en) 1977-09-01
DE2559601B2 (en) 1978-12-07
FR2286395B1 (en) 1981-04-30
DE2559601C3 (en) 1979-08-16
FR2286395A1 (en) 1976-04-23
DE2543160C3 (en) 1978-03-02
JPS5139120A (en) 1976-04-01

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Legal Events

Date Code Title Description
PS Patent sealed
732 Registration of transactions, instruments or events in the register (sect. 32/1977)
746 Register noted 'licences of right' (sect. 46/1977)
PE20 Patent expired after termination of 20 years

Effective date: 19950925