GB1263307A - Improvements in and relating to optical arrangements - Google Patents

Improvements in and relating to optical arrangements

Info

Publication number
GB1263307A
GB1263307A GB2633369A GB2633369A GB1263307A GB 1263307 A GB1263307 A GB 1263307A GB 2633369 A GB2633369 A GB 2633369A GB 2633369 A GB2633369 A GB 2633369A GB 1263307 A GB1263307 A GB 1263307A
Authority
GB
United Kingdom
Prior art keywords
view
finder
pentaprism
photo
eye
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
GB2633369A
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.)
Ricoh Co Ltd
Original Assignee
Ricoh 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 Ricoh Co Ltd filed Critical Ricoh Co Ltd
Publication of GB1263307A publication Critical patent/GB1263307A/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
    • G03B7/00—Control of exposure by setting shutters, diaphragms or filters, separately or conjointly
    • G03B7/08—Control effected solely on the basis of the response, to the intensity of the light received by the camera, of a built-in light-sensitive device
    • G03B7/099—Arrangement of photoelectric elements in or on the camera
    • G03B7/0993—Arrangement of photoelectric elements in or on the camera in the camera
    • G03B7/0997—Through the lens [TTL] measuring
    • G03B7/09971—Through the lens [TTL] measuring in mirror-reflex cameras
    • G03B7/09972—Through the lens [TTL] measuring in mirror-reflex cameras using the mirror as sensor light reflecting or transmitting member

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Viewfinders (AREA)
  • Cameras In General (AREA)

Abstract

1,263,307. View-finders. RICOH K. K. May 23, 1969 [May 30, 1968], No.26333/69. Heading G2A. A pentaprism view-finder 1A has a focusing plate 3A and an eye-piece 2A, a photo-electric element 5A being mounted with respect to the view-finder so as to view along a rectilinear path through the view-finder a predetermined portion of the focusing plate without detracting from light passing along the main viewing light path through the view-finder. A parallel sided glass plate 7 is positioned between prism surface 1cA and an eye-piece 2A, and a condenser lens 6A focuses light from a point PA in the focusing plate on to the photo-electric element. The pentaprism may be replaced by mirrors formed on the interior surfaces of a hollow plastics mounting, the glass plate 7 being omitted.
GB2633369A 1968-05-30 1969-05-23 Improvements in and relating to optical arrangements Expired GB1263307A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP3694968 1968-05-30

Publications (1)

Publication Number Publication Date
GB1263307A true GB1263307A (en) 1972-02-09

Family

ID=12483985

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2633369A Expired GB1263307A (en) 1968-05-30 1969-05-23 Improvements in and relating to optical arrangements

Country Status (2)

Country Link
DE (1) DE1927593A1 (en)
GB (1) GB1263307A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2320584A (en) * 1996-12-20 1998-06-24 Asahi Optical Co Ltd Prism with part recessed rear face for viewfinder
US6021006A (en) * 1996-11-12 2000-02-01 Asahi Kogaku Kogyo Kabushiki Kaisha Optical system having composite prism

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6021006A (en) * 1996-11-12 2000-02-01 Asahi Kogaku Kogyo Kabushiki Kaisha Optical system having composite prism
GB2320584A (en) * 1996-12-20 1998-06-24 Asahi Optical Co Ltd Prism with part recessed rear face for viewfinder
GB2320584B (en) * 1996-12-20 2001-06-06 Asahi Optical Co Ltd Prism with part recessed rear face for viewfinder
DE19756567B4 (en) * 1996-12-20 2005-03-24 Pentax Corp. prism

Also Published As

Publication number Publication date
DE1927593A1 (en) 1969-12-11

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