GB2295900B - Real image optical finder system - Google Patents

Real image optical finder system

Info

Publication number
GB2295900B
GB2295900B GB9524993A GB9524993A GB2295900B GB 2295900 B GB2295900 B GB 2295900B GB 9524993 A GB9524993 A GB 9524993A GB 9524993 A GB9524993 A GB 9524993A GB 2295900 B GB2295900 B GB 2295900B
Authority
GB
United Kingdom
Prior art keywords
real image
image optical
optical finder
finder system
real
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
GB9524993A
Other versions
GB2295900A (en
GB9524993D0 (en
Inventor
Sachio Hasushita
Masato Noguchi
Kazuhiro Yamada
Ichiro Taguchi
Masahiro Inazuka
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
Priority claimed from US08/354,093 external-priority patent/US5537184A/en
Application filed by Asahi Kogaku Kogyo Co Ltd filed Critical Asahi Kogaku Kogyo Co Ltd
Publication of GB9524993D0 publication Critical patent/GB9524993D0/en
Publication of GB2295900A publication Critical patent/GB2295900A/en
Application granted granted Critical
Publication of GB2295900B publication Critical patent/GB2295900B/en
Anticipated expiration legal-status Critical
Expired - Fee Related 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
    • G03B17/00—Details of cameras or camera bodies; Accessories therefor
    • G03B17/18—Signals indicating condition of a camera member or suitability of light
    • G03B17/20—Signals indicating condition of a camera member or suitability of light visible in viewfinder
    • 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
    • G03B13/00—Viewfinders; Focusing aids for cameras; Means for focusing for cameras; Autofocus systems for cameras
    • G03B13/02—Viewfinders
    • G03B13/04—Viewfinders of direct vision type, e.g. frame, sighting mark
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Viewfinders (AREA)
  • Liquid Crystal (AREA)
GB9524993A 1994-12-06 1995-12-06 Real image optical finder system Expired - Fee Related GB2295900B (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US08/354,093 US5537184A (en) 1994-01-25 1994-12-06 Real image finder system for a camera

Publications (3)

Publication Number Publication Date
GB9524993D0 GB9524993D0 (en) 1996-02-07
GB2295900A GB2295900A (en) 1996-06-12
GB2295900B true GB2295900B (en) 1998-06-17

Family

ID=23391853

Family Applications (1)

Application Number Title Priority Date Filing Date
GB9524993A Expired - Fee Related GB2295900B (en) 1994-12-06 1995-12-06 Real image optical finder system

Country Status (4)

Country Link
JP (1) JPH08234274A (en)
DE (1) DE19545545A1 (en)
FR (1) FR2727772B1 (en)
GB (1) GB2295900B (en)

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1988002877A2 (en) * 1986-10-20 1988-04-21 Eastman Kodak Company Optical device

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5130855A (en) * 1988-04-22 1992-07-14 Minolta Camera Kabushiki Kaisha Viewfinder optical system
JPH0229723A (en) * 1988-07-20 1990-01-31 Minolta Camera Co Ltd Real image type finder for camera
US5363163A (en) * 1991-05-14 1994-11-08 Minolta Camera Kabushiki Kaisha Finder optical system for pseudo focal length

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1988002877A2 (en) * 1986-10-20 1988-04-21 Eastman Kodak Company Optical device

Also Published As

Publication number Publication date
GB2295900A (en) 1996-06-12
FR2727772B1 (en) 1998-03-20
JPH08234274A (en) 1996-09-13
FR2727772A1 (en) 1996-06-07
GB9524993D0 (en) 1996-02-07
DE19545545A1 (en) 1996-08-29

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Legal Events

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

Effective date: 20051206