FR2661006B1 - Systeme de lentilles a focale variable. - Google Patents

Systeme de lentilles a focale variable.

Info

Publication number
FR2661006B1
FR2661006B1 FR9104743A FR9104743A FR2661006B1 FR 2661006 B1 FR2661006 B1 FR 2661006B1 FR 9104743 A FR9104743 A FR 9104743A FR 9104743 A FR9104743 A FR 9104743A FR 2661006 B1 FR2661006 B1 FR 2661006B1
Authority
FR
France
Prior art keywords
lens system
variable focal
focal lens
variable
lens
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
FR9104743A
Other languages
English (en)
Other versions
FR2661006A1 (fr
Inventor
Takayuki Ito
Nobutaka Minefuji
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 FR2661006A1 publication Critical patent/FR2661006A1/fr
Application granted granted Critical
Publication of FR2661006B1 publication Critical patent/FR2661006B1/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
    • 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
    • G02B15/142—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 two groups only
    • G02B15/1425—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 two groups only the first group being negative
FR9104743A 1990-04-17 1991-04-17 Systeme de lentilles a focale variable. Expired - Fee Related FR2661006B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP10218690 1990-04-17

Publications (2)

Publication Number Publication Date
FR2661006A1 FR2661006A1 (fr) 1991-10-18
FR2661006B1 true FR2661006B1 (fr) 1993-10-15

Family

ID=14320638

Family Applications (1)

Application Number Title Priority Date Filing Date
FR9104743A Expired - Fee Related FR2661006B1 (fr) 1990-04-17 1991-04-17 Systeme de lentilles a focale variable.

Country Status (4)

Country Link
US (1) US5155629A (fr)
DE (1) DE4112608A1 (fr)
FR (1) FR2661006B1 (fr)
GB (1) GB2244819B (fr)

Families Citing this family (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH05249373A (ja) * 1992-03-05 1993-09-28 Nikon Corp 広角ズームレンズ
US5321553A (en) * 1992-03-10 1994-06-14 Nikon Corporation Zoom lens
JPH05323192A (ja) * 1992-05-26 1993-12-07 Fuji Photo Optical Co Ltd 可変焦点距離レンズ
US5381269A (en) * 1993-03-30 1995-01-10 Eastman Kodak Company Zoom lens
US5552937A (en) * 1993-04-13 1996-09-03 Matsushita Electric Industrial Co., Ltd. Wide-angel aspheric zoom lens
US5546232A (en) * 1993-06-14 1996-08-13 Asahi Kogaku Kogyo Kabushiki Kaisha Two-group zoom lens
US5657167A (en) * 1994-04-11 1997-08-12 Fuji Photo Optical Co., Ltd. Focal length changeable lens system
US5539581A (en) * 1994-06-17 1996-07-23 Nikon Corp. Zoom lens system
US5745301A (en) * 1994-12-19 1998-04-28 Benopcon, Inc. Variable power lens systems for producing small images
JP3467105B2 (ja) * 1995-01-10 2003-11-17 ペンタックス株式会社 接眼レンズ系
JPH11125767A (ja) * 1997-10-21 1999-05-11 Asahi Optical Co Ltd 撮影レンズ系
US6934092B1 (en) * 1998-02-19 2005-08-23 Canon Kabushiki Kaisha Zoom lens and photographing apparatus having the same
US7212351B2 (en) * 2005-04-28 2007-05-01 Olympus Imaging Corp. Zoom optical system and image taking apparatus using the same
TW200704994A (en) 2005-07-22 2007-02-01 Optronics Technology Inc A Zoom lens
EP1760511A1 (fr) 2005-08-31 2007-03-07 A-Optronics Technology Inc. Zoom type rétrofocus à deux groupes de lentilles
CN100424537C (zh) * 2005-09-09 2008-10-08 欣相光电股份有限公司 变焦镜头
US10606046B2 (en) 2015-07-20 2020-03-31 Young Optics Inc. Zoom lens

Family Cites Families (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4923912B1 (fr) * 1970-12-15 1974-06-19
JPS6039204B2 (ja) * 1976-11-12 1985-09-05 ミノルタ株式会社 二成分広角ズ−ムレンズ系
JPS5811609B2 (ja) * 1978-03-10 1983-03-03 旭光学工業株式会社 コンパクトな広角ズ−ムレンズ
JPS55163511A (en) * 1979-06-08 1980-12-19 Nippon Kogaku Kk <Nikon> 2-group constitution zoom lens
JPS5695211A (en) * 1979-12-28 1981-08-01 Nippon Kogaku Kk <Nikon> Wide angle zoom lens
JPS56119109A (en) * 1980-02-23 1981-09-18 Mamiya Koki Kk Wide angle zoom lens
JPS57118213A (en) * 1981-01-14 1982-07-23 Asahi Optical Co Ltd Compact and wide-angle zoom lens
JPS585707A (ja) * 1981-07-03 1983-01-13 Nippon Kogaku Kk <Nikon> 広角ズ−ムレンズ
US4647160A (en) * 1981-12-24 1987-03-03 Canon Kabushiki Kaisha Small-sized wide angle zoom objective
JPS59137918A (ja) * 1983-01-27 1984-08-08 Olympus Optical Co Ltd 明るいズ−ムレンズ
JPS60178420A (ja) * 1984-02-27 1985-09-12 Canon Inc ズ−ムレンズ
US4770509A (en) * 1984-09-28 1988-09-13 Nippon Kogaku K. K. Zoom lens comprising two groups of lenses
JPS61240217A (ja) * 1985-04-17 1986-10-25 Asahi Optical Co Ltd コンパクトな広角ズ−ムレンズ
JPS63265211A (ja) * 1987-04-23 1988-11-01 Canon Inc バツクフオ−カスの長い変倍撮影レンズ

Also Published As

Publication number Publication date
US5155629A (en) 1992-10-13
FR2661006A1 (fr) 1991-10-18
GB2244819B (en) 1994-08-03
DE4112608A1 (de) 1991-10-24
GB2244819A (en) 1991-12-11
GB9107969D0 (en) 1991-05-29

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Legal Events

Date Code Title Description
ST Notification of lapse