GB2320584B - Prism with part recessed rear face for viewfinder - Google Patents

Prism with part recessed rear face for viewfinder

Info

Publication number
GB2320584B
GB2320584B GB9726885A GB9726885A GB2320584B GB 2320584 B GB2320584 B GB 2320584B GB 9726885 A GB9726885 A GB 9726885A GB 9726885 A GB9726885 A GB 9726885A GB 2320584 B GB2320584 B GB 2320584B
Authority
GB
United Kingdom
Prior art keywords
viewfinder
prism
rear face
recessed rear
part recessed
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
GB9726885A
Other versions
GB2320584A (en
GB9726885D0 (en
Inventor
Isamu Hirai
Etsuro Nishio
Yutaka Kamijo
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 GB9726885D0 publication Critical patent/GB9726885D0/en
Publication of GB2320584A publication Critical patent/GB2320584A/en
Application granted granted Critical
Publication of GB2320584B publication Critical patent/GB2320584B/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
    • G02B5/00—Optical elements other than lenses
    • G02B5/04—Prisms
    • 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
    • G03B7/09976—Through the lens [TTL] measuring in mirror-reflex cameras the sensor being mounted in, before, or behind the porro-prism

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Viewfinders (AREA)
  • Optical Elements Other Than Lenses (AREA)
  • Exposure Control For Cameras (AREA)
GB9726885A 1996-12-20 1997-12-18 Prism with part recessed rear face for viewfinder Expired - Fee Related GB2320584B (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP8354999A JPH10186454A (en) 1996-12-20 1996-12-20 Prism

Publications (3)

Publication Number Publication Date
GB9726885D0 GB9726885D0 (en) 1998-02-18
GB2320584A GB2320584A (en) 1998-06-24
GB2320584B true GB2320584B (en) 2001-06-06

Family

ID=18441296

Family Applications (1)

Application Number Title Priority Date Filing Date
GB9726885A Expired - Fee Related GB2320584B (en) 1996-12-20 1997-12-18 Prism with part recessed rear face for viewfinder

Country Status (3)

Country Link
JP (1) JPH10186454A (en)
DE (1) DE19756567B4 (en)
GB (1) GB2320584B (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114952498B (en) * 2022-04-08 2023-02-10 北京创思工贸有限公司 Processing method of porro prism

Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1118980A (en) * 1965-10-22 1968-07-03 Paillard Sa Improvements in or relating to a light intensity measuring device in the objective-lens of a filming apparatus
GB1194814A (en) * 1968-02-23 1970-06-10 Honeywell Inc Improvements in or relating to Cameras
GB1203872A (en) * 1968-02-08 1970-09-03 Pentacon Dresden Veb Camera viewfinder
GB1209551A (en) * 1967-02-02 1970-10-21 Nippon Kogaku Kk Single lens reflex camera
GB1263307A (en) * 1968-05-30 1972-02-09 Ricoh Kk Improvements in and relating to optical arrangements
GB1305883A (en) * 1970-04-28 1973-02-07
US4027327A (en) * 1974-08-09 1977-05-31 Fuji Photo Optical Co., Ltd. View finder for reflex camera
GB2017333A (en) * 1978-02-13 1979-10-03 Pentacon Dresden Veb Viewfinder system for a single- lens reflex camera
GB1558833A (en) * 1976-01-13 1980-01-09 Vivitar Corp Camera viewfinding systems
GB1559613A (en) * 1975-10-28 1980-01-23 Nippon Kogaku Kk Viewfinder for a single-lens reflex camera
US5245469A (en) * 1991-04-10 1993-09-14 Olympus Optical Co., Ltd. Real image type finder optical system

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1209729A (en) * 1968-08-19 1970-10-21 Ricoh Kk Improvements in and relating to optical exposure arrangements
US4134652A (en) * 1973-08-07 1979-01-16 Canon Kabushiki Kaisha Light measuring arrangement for a single lens reflex camera

Patent Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1118980A (en) * 1965-10-22 1968-07-03 Paillard Sa Improvements in or relating to a light intensity measuring device in the objective-lens of a filming apparatus
GB1209551A (en) * 1967-02-02 1970-10-21 Nippon Kogaku Kk Single lens reflex camera
GB1203872A (en) * 1968-02-08 1970-09-03 Pentacon Dresden Veb Camera viewfinder
GB1194814A (en) * 1968-02-23 1970-06-10 Honeywell Inc Improvements in or relating to Cameras
GB1263307A (en) * 1968-05-30 1972-02-09 Ricoh Kk Improvements in and relating to optical arrangements
GB1305883A (en) * 1970-04-28 1973-02-07
US4027327A (en) * 1974-08-09 1977-05-31 Fuji Photo Optical Co., Ltd. View finder for reflex camera
GB1559613A (en) * 1975-10-28 1980-01-23 Nippon Kogaku Kk Viewfinder for a single-lens reflex camera
GB1558833A (en) * 1976-01-13 1980-01-09 Vivitar Corp Camera viewfinding systems
GB2017333A (en) * 1978-02-13 1979-10-03 Pentacon Dresden Veb Viewfinder system for a single- lens reflex camera
US5245469A (en) * 1991-04-10 1993-09-14 Olympus Optical Co., Ltd. Real image type finder optical system

Also Published As

Publication number Publication date
GB2320584A (en) 1998-06-24
GB9726885D0 (en) 1998-02-18
DE19756567B4 (en) 2005-03-24
JPH10186454A (en) 1998-07-14
DE19756567A1 (en) 1998-06-25

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Legal Events

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

Effective date: 20071218