DE4232222C2 - Vario-Reellbildsucher - Google Patents

Vario-Reellbildsucher

Info

Publication number
DE4232222C2
DE4232222C2 DE4232222A DE4232222A DE4232222C2 DE 4232222 C2 DE4232222 C2 DE 4232222C2 DE 4232222 A DE4232222 A DE 4232222A DE 4232222 A DE4232222 A DE 4232222A DE 4232222 C2 DE4232222 C2 DE 4232222C2
Authority
DE
Germany
Prior art keywords
vario
real image
shielding device
light shielding
iib
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
DE4232222A
Other languages
German (de)
English (en)
Other versions
DE4232222A1 (de
Inventor
Takayuki Ito
Sachio Hasushita
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 DE4232222A1 publication Critical patent/DE4232222A1/de
Application granted granted Critical
Publication of DE4232222C2 publication Critical patent/DE4232222C2/de
Anticipated expiration legal-status Critical
Expired - Fee Related 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)
DE4232222A 1991-09-26 1992-09-25 Vario-Reellbildsucher Expired - Fee Related DE4232222C2 (de)

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
DE4232222A1 DE4232222A1 (de) 1993-04-22
DE4232222C2 true DE4232222C2 (de) 2002-06-06

Family

ID=18117889

Family Applications (1)

Application Number Title Priority Date Filing Date
DE4232222A Expired - Fee Related DE4232222C2 (de) 1991-09-26 1992-09-25 Vario-Reellbildsucher

Country Status (5)

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

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 (4)

* 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
US4963005A (en) * 1986-05-14 1990-10-16 Canon Kabushiki Kaishi Zoom lens having built-in diaphragm
DE4104557A1 (de) * 1990-02-14 1991-08-22 Asahi Optical Co Ltd Reellbildsucher

Family Cites Families (5)

* 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
JPH0658454B2 (ja) * 1985-07-03 1994-08-03 キヤノン株式会社 変倍フアインダ−
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
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
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 (4)

* 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
US4963005A (en) * 1986-05-14 1990-10-16 Canon Kabushiki Kaishi Zoom lens having built-in diaphragm
DE4104557A1 (de) * 1990-02-14 1991-08-22 Asahi Optical Co Ltd Reellbildsucher

Also Published As

Publication number Publication date
JPH0588235A (ja) 1993-04-09
GB2260202B (en) 1994-11-09
FR2681954B1 (enExample) 1995-03-10
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
FR2681954A1 (fr) 1993-04-02

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Legal Events

Date Code Title Description
8110 Request for examination paragraph 44
8125 Change of the main classification

Ipc: G03B 13/12

D2 Grant after examination
8364 No opposition during term of opposition
8327 Change in the person/name/address of the patent owner

Owner name: PENTAX CORP., TOKIO/TOKYO, JP

8339 Ceased/non-payment of the annual fee