GB2227104B - Viewfinder - Google Patents

Viewfinder

Info

Publication number
GB2227104B
GB2227104B GB9000066A GB9000066A GB2227104B GB 2227104 B GB2227104 B GB 2227104B GB 9000066 A GB9000066 A GB 9000066A GB 9000066 A GB9000066 A GB 9000066A GB 2227104 B GB2227104 B GB 2227104B
Authority
GB
United Kingdom
Prior art keywords
viewfinder
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 - Fee Related
Application number
GB9000066A
Other versions
GB9000066D0 (en
GB2227104A (en
Inventor
Saburo Sugawara
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 GB9000066D0 publication Critical patent/GB9000066D0/en
Publication of GB2227104A publication Critical patent/GB2227104A/en
Application granted granted Critical
Publication of GB2227104B publication Critical patent/GB2227104B/en
Anticipated expiration legal-status Critical
Expired - Fee Related 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
    • 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

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Astronomy & Astrophysics (AREA)
  • Optics & Photonics (AREA)
  • Lenses (AREA)
  • Viewfinders (AREA)
GB9000066A 1989-01-09 1990-01-03 Viewfinder Expired - Fee Related GB2227104B (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP1002331A JPH0758368B2 (en) 1989-01-09 1989-01-09 Viewfinder optical system of a single-lens reflex camera using a pentamirror

Publications (3)

Publication Number Publication Date
GB9000066D0 GB9000066D0 (en) 1990-03-07
GB2227104A GB2227104A (en) 1990-07-18
GB2227104B true GB2227104B (en) 1993-03-31

Family

ID=11526331

Family Applications (1)

Application Number Title Priority Date Filing Date
GB9000066A Expired - Fee Related GB2227104B (en) 1989-01-09 1990-01-03 Viewfinder

Country Status (4)

Country Link
JP (1) JPH0758368B2 (en)
DE (1) DE4000448C2 (en)
FR (1) FR2641621B1 (en)
GB (1) GB2227104B (en)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3072157B2 (en) * 1991-09-10 2000-07-31 旭光学工業株式会社 Zoom finder
GB2261744B (en) * 1991-11-25 1996-07-03 Asahi Optical Co Ltd Variable power view finder with aspheric lens surfaces
GB2282459B (en) * 1991-11-25 1996-07-03 Asahi Optical Co Ltd Optical system having a biaspheric lens and an aspheric lens
JP4439608B2 (en) * 1997-12-24 2010-03-24 キヤノン株式会社 Viewfinder optical system
JP6447124B2 (en) * 2014-12-26 2019-01-09 株式会社ニコン Eyepiece, optical device, and method of manufacturing eyepiece

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB983342A (en) * 1962-12-19 1965-02-17 Ednalite Corp Improvements in or relating to lens systems
GB1269529A (en) * 1968-06-04 1972-04-06 Ricoh Kk Improvements in and relating to viewfinder systems
GB1483116A (en) * 1974-10-29 1977-08-17 Rank Organisation Ltd Optical objectives
GB1500495A (en) * 1975-04-04 1978-02-08 Harwood G Photographic lens
US4212526A (en) * 1978-08-22 1980-07-15 Minolta Camera Kabushiki Kaisha Viewfinder for single lens reflex camera

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1800365B2 (en) * 1968-10-01 1976-09-16 Ausscheidung in: 18 17 991 KJC. Ricoh, Tokio Lightweight SLR camera - with hollow pentaprism and exposure meter pivotted to swing into operating position after viewing
JPS6048013B2 (en) * 1978-03-09 1985-10-24 キヤノン株式会社 Finder optical system
JPH0241613Y2 (en) * 1979-02-01 1990-11-06
JPS5754931A (en) * 1980-09-19 1982-04-01 Nippon Kogaku Kk <Nikon> View finder for single-lens reflex camera

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB983342A (en) * 1962-12-19 1965-02-17 Ednalite Corp Improvements in or relating to lens systems
GB1269529A (en) * 1968-06-04 1972-04-06 Ricoh Kk Improvements in and relating to viewfinder systems
GB1483116A (en) * 1974-10-29 1977-08-17 Rank Organisation Ltd Optical objectives
GB1500495A (en) * 1975-04-04 1978-02-08 Harwood G Photographic lens
US4212526A (en) * 1978-08-22 1980-07-15 Minolta Camera Kabushiki Kaisha Viewfinder for single lens reflex camera

Also Published As

Publication number Publication date
GB9000066D0 (en) 1990-03-07
JPH02181713A (en) 1990-07-16
JPH0758368B2 (en) 1995-06-21
GB2227104A (en) 1990-07-18
FR2641621B1 (en) 1993-04-23
DE4000448A1 (en) 1990-07-12
DE4000448C2 (en) 1993-12-02
FR2641621A1 (en) 1990-07-13

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Legal Events

Date Code Title Description
PCNP Patent ceased through non-payment of renewal fee

Effective date: 19960103