FR2638249B1 - Viseur a foyer variable pour appareil de prise de vues - Google Patents

Viseur a foyer variable pour appareil de prise de vues

Info

Publication number
FR2638249B1
FR2638249B1 FR8914073A FR8914073A FR2638249B1 FR 2638249 B1 FR2638249 B1 FR 2638249B1 FR 8914073 A FR8914073 A FR 8914073A FR 8914073 A FR8914073 A FR 8914073A FR 2638249 B1 FR2638249 B1 FR 2638249B1
Authority
FR
France
Prior art keywords
camera
variable focus
sight
focus sight
variable
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
FR8914073A
Other languages
English (en)
Other versions
FR2638249A1 (fr
Inventor
Sugawara Saburo
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 FR2638249A1 publication Critical patent/FR2638249A1/fr
Application granted granted Critical
Publication of FR2638249B1 publication Critical patent/FR2638249B1/fr
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
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B13/00—Optical objectives specially designed for the purposes specified below
    • G02B13/18—Optical objectives specially designed for the purposes specified below with lenses having one or more non-spherical faces, e.g. for reducing geometrical aberration
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B15/00—Optical objectives with means for varying the magnification
    • G02B15/14—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective
    • G02B15/144—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective having four groups only
    • G02B15/1441—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective having four groups only the first group being positive
    • G02B15/144109—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective having four groups only the first group being positive arranged +--+
    • 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
    • G02B23/145—Zoom viewfinders

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Astronomy & Astrophysics (AREA)
  • Lenses (AREA)
  • Viewfinders (AREA)
FR8914073A 1988-10-26 1989-10-26 Viseur a foyer variable pour appareil de prise de vues Expired - Fee Related FR2638249B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP63270384A JP2859275B2 (ja) 1988-10-26 1988-10-26 ズームファインダー

Publications (2)

Publication Number Publication Date
FR2638249A1 FR2638249A1 (fr) 1990-04-27
FR2638249B1 true FR2638249B1 (fr) 1994-02-25

Family

ID=17485511

Family Applications (1)

Application Number Title Priority Date Filing Date
FR8914073A Expired - Fee Related FR2638249B1 (fr) 1988-10-26 1989-10-26 Viseur a foyer variable pour appareil de prise de vues

Country Status (5)

Country Link
US (1) US5052787A (fr)
JP (1) JP2859275B2 (fr)
DE (1) DE3935696A1 (fr)
FR (1) FR2638249B1 (fr)
GB (1) GB2225871B (fr)

Families Citing this family (20)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH04264411A (ja) * 1991-02-19 1992-09-21 Asahi Optical Co Ltd アルバダ式ズームファインダ
JP2577264Y2 (ja) * 1991-04-16 1998-07-23 旭光学工業株式会社 カメラのファインダー
US5241337A (en) * 1991-05-13 1993-08-31 Eastman Kodak Company Real image viewfinder requiring no field lens
US5182592A (en) * 1991-05-13 1993-01-26 Eastman Kodak Company Real image zoom viewfinder
US5155517A (en) * 1991-05-13 1992-10-13 Eastman Kodak Company Optical system with improved field mask
JP3072157B2 (ja) * 1991-09-10 2000-07-31 旭光学工業株式会社 変倍ファインダー
GB2261744B (en) * 1991-11-25 1996-07-03 Asahi Optical Co Ltd Variable power view finder with aspheric lens surfaces
JPH05297274A (ja) * 1992-04-16 1993-11-12 Nikon Corp ケプラー式ズームファインダー光学系
JP3330660B2 (ja) * 1992-07-20 2002-09-30 株式会社リコー 変倍ファインダー
US5442481A (en) * 1992-08-18 1995-08-15 Asahi Kogaku Kabushiki Kaisha Finder optical system in camera
FR2700623B1 (fr) * 1993-01-18 1996-05-24 Asahi Optical Co Ltd Viseur du type à image réelle.
US5692227A (en) * 1993-04-05 1997-11-25 Asahi Kogaku Kogyo Kabushiki Kaisha Viewfinder
CN1071459C (zh) * 1994-02-04 2001-09-19 旭光学工业株式会社 实象型的可变光焦度取景器
JP3554366B2 (ja) * 1994-07-29 2004-08-18 ペンタックス株式会社 高変倍実像式ファインダー
JP3443200B2 (ja) * 1995-02-28 2003-09-02 オリンパス光学工業株式会社 ケプラー式変倍ファインダー
JPH09251126A (ja) * 1996-03-15 1997-09-22 Olympus Optical Co Ltd 実像式ファインダー光学系
JPH11133317A (ja) * 1997-10-31 1999-05-21 Asahi Optical Co Ltd ズームルーペ
CN104570298B (zh) * 2015-01-04 2017-04-05 中山联合光电科技有限公司 一种内对焦、大像面、高照度的手机镜头
TWI730517B (zh) 2019-11-29 2021-06-11 大立光電股份有限公司 透鏡系統及電子裝置
CN112230405B (zh) * 2020-11-04 2022-10-04 中国航空工业集团公司洛阳电光设备研究所 一种消除冷像的红外大视场无前固定组变焦距光学系统

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1126729B (de) * 1960-01-20 1962-03-29 Voigtlaender Ag ALBADA-Sucher mit Parallaxausgleich
JPH0615355B2 (ja) * 1984-04-18 1994-03-02 ヤマハ発動機株式会社 車両の懸架装置
JPS6187112A (ja) * 1984-10-05 1986-05-02 Nippon Telegr & Teleph Corp <Ntt> 光フアイバ成端構造
JPS6187122A (ja) * 1984-10-05 1986-05-02 Konishiroku Photo Ind Co Ltd 変倍ファインダ−
JPS61156019A (ja) * 1984-12-27 1986-07-15 Canon Inc 変倍フアインダ−
JPS61160712A (ja) * 1985-01-08 1986-07-21 Canon Inc 変倍フアインダ−
JPS6352114A (ja) * 1986-08-22 1988-03-05 Asahi Optical Co Ltd ズ−ムレンズを備えたレンズシヤツタ式カメラのフアインダ光学装置
JP2501452B2 (ja) * 1987-01-23 1996-05-29 オリンパス光学工業株式会社 アルバダ式ズ―ムファインダ―
JPH0782185B2 (ja) * 1987-03-09 1995-09-06 コニカ株式会社 アルバダ式逆ガリレオフアインダ−
JPH06187122A (ja) * 1992-08-03 1994-07-08 Nec Eng Ltd 文字情報入力による予告指令方式

Also Published As

Publication number Publication date
JPH02116811A (ja) 1990-05-01
JP2859275B2 (ja) 1999-02-17
DE3935696C2 (fr) 1993-01-21
FR2638249A1 (fr) 1990-04-27
GB8923916D0 (en) 1989-12-13
US5052787A (en) 1991-10-01
GB2225871A (en) 1990-06-13
GB2225871B (en) 1992-12-23
DE3935696A1 (de) 1990-07-05

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Legal Events

Date Code Title Description
D6 Patent endorsed licences of rights
ST Notification of lapse

Effective date: 20070629