FR2681954A1 - Viseur a grandissement variable. - Google Patents

Viseur a grandissement variable. Download PDF

Info

Publication number
FR2681954A1
FR2681954A1 FR9211493A FR9211493A FR2681954A1 FR 2681954 A1 FR2681954 A1 FR 2681954A1 FR 9211493 A FR9211493 A FR 9211493A FR 9211493 A FR9211493 A FR 9211493A FR 2681954 A1 FR2681954 A1 FR 2681954A1
Authority
FR
France
Prior art keywords
viewfinder
focal length
light
magnification
variation
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.)
Granted
Application number
FR9211493A
Other languages
English (en)
French (fr)
Other versions
FR2681954B1 (OSRAM
Inventor
Ito Takayuki
Hasushita Sachio
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 FR2681954A1 publication Critical patent/FR2681954A1/fr
Application granted granted Critical
Publication of FR2681954B1 publication Critical patent/FR2681954B1/fr
Granted legal-status Critical Current

Links

Classifications

    • 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
    • G02B15/16—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 with interdependent non-linearly related movements between one lens or lens group, and another lens or lens group
    • 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
    • G02B15/143—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 three groups only
    • 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)
  • Nonlinear Science (AREA)
  • Lenses (AREA)
  • Viewfinders (AREA)
FR9211493A 1991-09-26 1992-09-25 Viseur a grandissement variable. Granted FR2681954A1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP32011791A JP3164618B2 (ja) 1991-09-26 1991-09-26 実像式変倍ファインダー

Publications (2)

Publication Number Publication Date
FR2681954A1 true FR2681954A1 (fr) 1993-04-02
FR2681954B1 FR2681954B1 (OSRAM) 1995-03-10

Family

ID=18117889

Family Applications (1)

Application Number Title Priority Date Filing Date
FR9211493A Granted FR2681954A1 (fr) 1991-09-26 1992-09-25 Viseur a grandissement variable.

Country Status (5)

Country Link
US (1) US5309278A (OSRAM)
JP (1) JP3164618B2 (OSRAM)
DE (1) DE4232222C2 (OSRAM)
FR (1) FR2681954A1 (OSRAM)
GB (1) GB2260202B (OSRAM)

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4239603B4 (de) * 1991-11-25 2005-04-21 Pentax Corp. Reellbildvariosucher
GB2261744B (en) * 1991-11-25 1996-07-03 Asahi Optical Co Ltd Variable power view finder with aspheric lens surfaces
GB2282461A (en) * 1991-11-25 1995-04-05 Asahi Optical Co Ltd Variable power view finder
JP3387524B2 (ja) * 1992-07-06 2003-03-17 オリンパス光学工業株式会社 変倍ファインダ光学系
KR0133039B1 (ko) * 1993-04-26 1998-04-15 이대원 줌잉 작동하는 렌즈계를 보유하는 광학기기
JP3311090B2 (ja) * 1993-07-12 2002-08-05 旭光学工業株式会社 実像式ファインダ
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
US6522475B2 (en) * 1996-02-15 2003-02-18 Canon Kabushiki Kaisha Zoom lens
JP3306351B2 (ja) * 1997-09-29 2002-07-24 旭光学工業株式会社 実像式変倍ファインダー
JP3490924B2 (ja) 1999-04-08 2004-01-26 ペンタックス株式会社 実像式変倍ファインダ

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4367927A (en) * 1977-07-23 1983-01-11 Olympus Optical Co., Ltd. Zoom lens system
US4779969A (en) * 1985-07-03 1988-10-25 Canon Kabushiki Kaisha Finding device of variable magnification
US4842395A (en) * 1984-12-27 1989-06-27 Canon Kabushiki Kaisha Finder of variable magnification
US4909615A (en) * 1987-05-29 1990-03-20 Minolta Camera Kabushiki Kaisha Zoom lens system for use in an image projecting apparatus with kohler illumination
US4963005A (en) * 1986-05-14 1990-10-16 Canon Kabushiki Kaishi Zoom lens having built-in diaphragm

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4637690A (en) * 1981-04-06 1987-01-20 Konishiroku Photo Industry Co., Ltd. Telecentric zoom lens system
JP2699394B2 (ja) * 1988-04-07 1998-01-19 ミノルタ株式会社 変倍ファインダー光学系
JP2881744B2 (ja) * 1990-02-14 1999-04-12 旭光学工業株式会社 実像式ファインダー
JPH10257817A (ja) * 1997-03-18 1998-09-29 Mitsubishi Agricult Mach Co Ltd 移動収穫機のベルトクラッチ装置

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4367927A (en) * 1977-07-23 1983-01-11 Olympus Optical Co., Ltd. Zoom lens system
US4842395A (en) * 1984-12-27 1989-06-27 Canon Kabushiki Kaisha Finder of variable magnification
US4779969A (en) * 1985-07-03 1988-10-25 Canon Kabushiki Kaisha Finding device of variable magnification
US4963005A (en) * 1986-05-14 1990-10-16 Canon Kabushiki Kaishi Zoom lens having built-in diaphragm
US4909615A (en) * 1987-05-29 1990-03-20 Minolta Camera Kabushiki Kaisha Zoom lens system for use in an image projecting apparatus with kohler illumination

Also Published As

Publication number Publication date
JPH0588235A (ja) 1993-04-09
GB2260202B (en) 1994-11-09
FR2681954B1 (OSRAM) 1995-03-10
DE4232222C2 (de) 2002-06-06
DE4232222A1 (de) 1993-04-22
US5309278A (en) 1994-05-03
JP3164618B2 (ja) 2001-05-08
GB2260202A (en) 1993-04-07
GB9220408D0 (en) 1992-11-11

Similar Documents

Publication Publication Date Title
FR2660765A1 (fr) Appareil de visee a foyer variable pour appareil de prise de vues.
JP2004069808A5 (OSRAM)
JPH05224122A (ja) ズームレンズ
JP3035830B2 (ja) ズームレンズ
JP2005173191A5 (OSRAM)
FR2658924A1 (fr) Viseur zoom.
FR2761166A1 (fr) Objectif a focale variable
FR2681954A1 (fr) Viseur a grandissement variable.
FR2723217A1 (fr) Viseur a image reelle a puissance variable
FR2801111A1 (fr) Objectif a focale variable et appareil photographique
FR2682776A1 (fr) Systeme de lentilles formant un objectif a focale variable.
JP4921045B2 (ja) 光学系及びそれを有する光学機器
FR2658312A1 (fr) Viseur a image reelle notamment pour appareils photographiques.
JP2003302575A5 (OSRAM)
FR2674640A1 (fr) Systeme de lentilles a focale variable.
FR2700623A1 (fr) Viseur du type à image réelle.
FR2722891A1 (fr) Viseur a grossissement variable
FR2681153A1 (fr) Viseur a focale variable.
KR102822139B1 (ko) 렌즈 광학계
FR2734916A1 (fr) Viseur a grossissement variable
CN103487919A (zh) 摄像镜片组及其摄像装置
JP2719839B2 (ja) コンパクトなズームレンズ
FR2522162A1 (fr) Objectif, notamment pour appareil de prise de vue propre a une surveillance terrestre ou subaquatique
JPS63194215A (ja) リアアタツチメントレンズ
KR102632378B1 (ko) 촬상 광학계 및 이를 포함하는 휴대용 전자기기

Legal Events

Date Code Title Description
ST Notification of lapse

Effective date: 20060531