JPH0443311A - Zoom lens - Google Patents

Zoom lens

Info

Publication number
JPH0443311A
JPH0443311A JP14984890A JP14984890A JPH0443311A JP H0443311 A JPH0443311 A JP H0443311A JP 14984890 A JP14984890 A JP 14984890A JP 14984890 A JP14984890 A JP 14984890A JP H0443311 A JPH0443311 A JP H0443311A
Authority
JP
Japan
Prior art keywords
lens
positive
group
3rd group
surface
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
JP14984890A
Other versions
JP3147167B2 (en
Inventor
Atsujirou Ishii
Original Assignee
Olympus Optical 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 Olympus Optical Co Ltd filed Critical Olympus Optical Co Ltd
Priority to JP14984890A priority Critical patent/JP3147167B2/en
Priority claimed from US07/712,980 external-priority patent/US5189558A/en
Publication of JPH0443311A publication Critical patent/JPH0443311A/en
Application granted granted Critical
Publication of JP3147167B2 publication Critical patent/JP3147167B2/en
Anticipated expiration legal-status Critical
Application status is Expired - Fee Related legal-status Critical

Links

Abstract

PURPOSE: To make the power variation ratio large and to decrease the number of lens elements by using an aspherical surface which decreases in refracting power with the distance from the optical axis as at least one surface among the lens surfaces of a 4th group composed of a single positive or two positive lenses.
CONSTITUTION: A 3rd group consists of a positive and a negative lens and the 4th group consists of a single positive lens; and the object-side surface of the 4th group is aspherical and the surface of the 3rd group which is closest to the object side is also aspherical. Thus, the negative lens is arranged in the 3rd group to compensate an on-axis chromatic aberration and a power chromatic aberration sufficiently and this negative lens compensates even a negative spherical aberration. Further, the 3rd group is given sufficient refracting power, the principal point of the 3rd group is set as forward as possible, and a positive lens whose object-side surface is convex is arranged on the most object side to provide two or three positive lenses including the positive lens. The 4th group is used as a focusing group. Consequently, the small-sized lens system which has a high power variation ratio and a large aperture ratio and consists of a small number of lens elements is obtained.
COPYRIGHT: (C)1992,JPO&Japio
JP14984890A 1990-06-11 1990-06-11 Zoom lens Expired - Fee Related JP3147167B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP14984890A JP3147167B2 (en) 1990-06-11 1990-06-11 Zoom lens

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP14984890A JP3147167B2 (en) 1990-06-11 1990-06-11 Zoom lens
US07/712,980 US5189558A (en) 1990-06-11 1991-06-10 Vari-focal system having short total length

Publications (2)

Publication Number Publication Date
JPH0443311A true JPH0443311A (en) 1992-02-13
JP3147167B2 JP3147167B2 (en) 2001-03-19

Family

ID=15483975

Family Applications (1)

Application Number Title Priority Date Filing Date
JP14984890A Expired - Fee Related JP3147167B2 (en) 1990-06-11 1990-06-11 Zoom lens

Country Status (1)

Country Link
JP (1) JP3147167B2 (en)

Cited By (27)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0478808A (en) * 1990-07-20 1992-03-12 Canon Inc Rear focus type zoom lens
JPH0478807A (en) * 1990-07-20 1992-03-12 Canon Inc Rear focus type zoom lens
US5583697A (en) * 1993-04-26 1996-12-10 Canon Kabushiki Kaisha Rear-focus type zoom lens with movable second and fourth lens units for zooming and focusing
US5612825A (en) * 1994-03-14 1997-03-18 Canon Kabushiki Kaisha Zoom lens
WO1997038340A1 (en) * 1996-04-10 1997-10-16 Matsushita Electric Industrial Co., Ltd. Zoom lens unit
US5712733A (en) * 1995-01-31 1998-01-27 Canon Kabushiki Kaisha Zoom lens of rear focus type
US5751496A (en) * 1995-05-30 1998-05-12 Canon Kabushiki Kaisha Zoom lens of rear focus type
US5818646A (en) * 1995-05-30 1998-10-06 Canon Kabushiki Kaisha Zoom lens of rear focus type
US5933283A (en) * 1996-04-15 1999-08-03 Canon Kabushiki Kaisha Zoom lens
US6084722A (en) * 1997-07-02 2000-07-04 Canon Kabushiki Kaisha Zoom lens of rear focus type and image pickup apparatus
US6118593A (en) * 1998-09-09 2000-09-12 Canon Kabushiki Kaisha Zoom lens and optical apparatus having the same
EP1046940A2 (en) * 1999-04-05 2000-10-25 Matsushita Electric Industrial Co., Ltd. Zoom lens and video camera using the same
US6178049B1 (en) 1996-04-09 2001-01-23 Canon Kabushiki Kaisha Zoom lens
US6185048B1 (en) 1997-10-14 2001-02-06 Olympus Optical Co., Ltd. Zoom lens system
US6331917B1 (en) 1997-10-14 2001-12-18 Olympus Optical Co., Ltd. Zoom lens system
US6344932B1 (en) 1999-01-19 2002-02-05 Canon Kabushiki Kaisha Zoom lens and optical apparatus having the same
US6392817B1 (en) 1999-07-26 2002-05-21 Canon Kabushiki Kaisha Rear focus type zoom lens and optical apparatus using the same
US6498687B1 (en) 1999-10-06 2002-12-24 Canon Kabushiki Kaisha Zoom lens and optical apparatus having the same
US6587281B2 (en) 2000-06-12 2003-07-01 Olympus Optical Co., Ltd. Zoom image pickup optical system
US6606202B2 (en) 2000-09-26 2003-08-12 Canon Kabushiki Kaisha Zoom lens system and optical apparatus using the same
US6754009B2 (en) 2002-02-28 2004-06-22 Canon Kabushiki Kaisha Zoom lens and image taking apparatus having the same
US6972909B2 (en) 2004-02-26 2005-12-06 Canon Kabushiki Kaisha Zoom lens and image pickup apparatus having the same
US7106521B2 (en) 2001-09-28 2006-09-12 Canon Kabushiki Kaisha Zoom lens and camera with the zoom lens
US7199942B2 (en) 2005-04-19 2007-04-03 Canon Kabushiki Kaisha Zoom lens system and image pickup apparatus including the zoom lens system
US7199941B2 (en) 2003-10-29 2007-04-03 Sony Corporation Zoom lens
US7457046B2 (en) 2003-07-01 2008-11-25 Canon Kabushiki Kaisha Zoom lens system and image-taking apparatus
US7715113B2 (en) 2007-11-15 2010-05-11 Fujinon Corporation Zoom lens and imaging apparatus

Cited By (34)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0478807A (en) * 1990-07-20 1992-03-12 Canon Inc Rear focus type zoom lens
JPH0478808A (en) * 1990-07-20 1992-03-12 Canon Inc Rear focus type zoom lens
US5583697A (en) * 1993-04-26 1996-12-10 Canon Kabushiki Kaisha Rear-focus type zoom lens with movable second and fourth lens units for zooming and focusing
US5612825A (en) * 1994-03-14 1997-03-18 Canon Kabushiki Kaisha Zoom lens
US5712733A (en) * 1995-01-31 1998-01-27 Canon Kabushiki Kaisha Zoom lens of rear focus type
US5751496A (en) * 1995-05-30 1998-05-12 Canon Kabushiki Kaisha Zoom lens of rear focus type
US5818646A (en) * 1995-05-30 1998-10-06 Canon Kabushiki Kaisha Zoom lens of rear focus type
US6178049B1 (en) 1996-04-09 2001-01-23 Canon Kabushiki Kaisha Zoom lens
US6226130B1 (en) 1996-04-09 2001-05-01 Canon Kabushiki Kaisha Zoom lens
WO1997038340A1 (en) * 1996-04-10 1997-10-16 Matsushita Electric Industrial Co., Ltd. Zoom lens unit
US5933283A (en) * 1996-04-15 1999-08-03 Canon Kabushiki Kaisha Zoom lens
US6084722A (en) * 1997-07-02 2000-07-04 Canon Kabushiki Kaisha Zoom lens of rear focus type and image pickup apparatus
USRE40582E1 (en) * 1997-10-14 2008-11-25 Olympus Corporation Zoom lens system
US6744571B2 (en) 1997-10-14 2004-06-01 Olympus Optical Co., Ltd. Zoom lens system
US6185048B1 (en) 1997-10-14 2001-02-06 Olympus Optical Co., Ltd. Zoom lens system
US6331917B1 (en) 1997-10-14 2001-12-18 Olympus Optical Co., Ltd. Zoom lens system
US6118593A (en) * 1998-09-09 2000-09-12 Canon Kabushiki Kaisha Zoom lens and optical apparatus having the same
US6388818B1 (en) 1998-09-09 2002-05-14 Canon Kabushiki Kaisha Zoom lens and optical apparatus having the same
US6344932B1 (en) 1999-01-19 2002-02-05 Canon Kabushiki Kaisha Zoom lens and optical apparatus having the same
EP1046940A2 (en) * 1999-04-05 2000-10-25 Matsushita Electric Industrial Co., Ltd. Zoom lens and video camera using the same
US6542312B1 (en) 1999-04-05 2003-04-01 Matsushita Electric Industrial Co., Ltd. Zoom lens and video camera using the same
EP1046940A3 (en) * 1999-04-05 2002-03-27 Matsushita Electric Industrial Co., Ltd. Zoom lens and video camera using the same
US6392817B1 (en) 1999-07-26 2002-05-21 Canon Kabushiki Kaisha Rear focus type zoom lens and optical apparatus using the same
US6498687B1 (en) 1999-10-06 2002-12-24 Canon Kabushiki Kaisha Zoom lens and optical apparatus having the same
US6587281B2 (en) 2000-06-12 2003-07-01 Olympus Optical Co., Ltd. Zoom image pickup optical system
US6788474B2 (en) 2000-06-12 2004-09-07 Olympus Corporation Zoom image pickup optical system
US6606202B2 (en) 2000-09-26 2003-08-12 Canon Kabushiki Kaisha Zoom lens system and optical apparatus using the same
US7106521B2 (en) 2001-09-28 2006-09-12 Canon Kabushiki Kaisha Zoom lens and camera with the zoom lens
US6754009B2 (en) 2002-02-28 2004-06-22 Canon Kabushiki Kaisha Zoom lens and image taking apparatus having the same
US7457046B2 (en) 2003-07-01 2008-11-25 Canon Kabushiki Kaisha Zoom lens system and image-taking apparatus
US7199941B2 (en) 2003-10-29 2007-04-03 Sony Corporation Zoom lens
US6972909B2 (en) 2004-02-26 2005-12-06 Canon Kabushiki Kaisha Zoom lens and image pickup apparatus having the same
US7199942B2 (en) 2005-04-19 2007-04-03 Canon Kabushiki Kaisha Zoom lens system and image pickup apparatus including the zoom lens system
US7715113B2 (en) 2007-11-15 2010-05-11 Fujinon Corporation Zoom lens and imaging apparatus

Also Published As

Publication number Publication date
JP3147167B2 (en) 2001-03-19

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