JPS6256917A - Small-sized zoom lens - Google Patents

Small-sized zoom lens

Info

Publication number
JPS6256917A
JPS6256917A JP19745985A JP19745985A JPS6256917A JP S6256917 A JPS6256917 A JP S6256917A JP 19745985 A JP19745985 A JP 19745985A JP 19745985 A JP19745985 A JP 19745985A JP S6256917 A JPS6256917 A JP S6256917A
Authority
JP
Japan
Prior art keywords
lens
refracting power
small
aspherical
sized zoom
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
JP19745985A
Other languages
Japanese (ja)
Inventor
Hiroki Nakayama
Koji Oizumi
Yasuhisa Sato
Yasuyuki Yamada
Original Assignee
Canon Inc
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 Canon Inc filed Critical Canon Inc
Priority to JP19745985A priority Critical patent/JPS6256917A/en
Publication of JPS6256917A publication Critical patent/JPS6256917A/en
Granted legal-status Critical Current

Links

Abstract

PURPOSE: To obtain a small-sized zoom lens which has high optical performance by providing two lens groups and making one lens surface of the 1st or 2nd lens group and the object-side lens surface of the 6th lens aspherical.
CONSTITUTION: The 1st lens group which has positive refracting power and the 2nd group which has negative refracting power are provided successively from the object side and the gap between both lens groups is varied to perform power variation. At least one lens surface of the 1st lens group is made aspherical so that the refracting power is larger at a position of 100% in lens surface effective diameter than at a position of 90%. In another way, at least one lens surface of the 2nd lens group is made aspherical so that the negative refracting power is smaller at a position of 90% in lens surface effective diameter than at a position of 100%. Further, the object-side lens surface of the 6th lens is made aspherical so that the negative refracting power is smaller at the lens peripheral part than at the center part. Thus, the optical performance of the small-sized zoom lens is improved.
COPYRIGHT: (C)1987,JPO&Japio
JP19745985A 1985-09-05 1985-09-05 Small-sized zoom lens Granted JPS6256917A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP19745985A JPS6256917A (en) 1985-09-05 1985-09-05 Small-sized zoom lens

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP19745985A JPS6256917A (en) 1985-09-05 1985-09-05 Small-sized zoom lens

Publications (1)

Publication Number Publication Date
JPS6256917A true JPS6256917A (en) 1987-03-12

Family

ID=16374853

Family Applications (1)

Application Number Title Priority Date Filing Date
JP19745985A Granted JPS6256917A (en) 1985-09-05 1985-09-05 Small-sized zoom lens

Country Status (1)

Country Link
JP (1) JPS6256917A (en)

Cited By (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63311224A (en) * 1987-06-12 1988-12-20 Olympus Optical Co Ltd Compact zoom lens
JPH0273322A (en) * 1988-09-09 1990-03-13 Nikon Corp Miniature zoom lens
JPH02120714A (en) * 1988-10-31 1990-05-08 Canon Inc Zoom lens of small size
US5218478A (en) * 1989-11-17 1993-06-08 Canon Kabushiki Kaisha Small-sized zoom lens
US5327290A (en) * 1989-10-13 1994-07-05 Minolta Camera Kabushiki Kaisha Compact size zoom lens system
JPH07306361A (en) * 1994-05-11 1995-11-21 Canon Inc Compact zoom lens
US5541773A (en) * 1993-03-26 1996-07-30 Olympus Optical Co., Ltd. Two-unit zoom lens system
US5585971A (en) * 1993-03-30 1996-12-17 Canon Kabushiki Kaisha Small-sized variable magnification lens
US5687027A (en) * 1995-03-02 1997-11-11 Canon Kabushiki Kaisha Zoom lens for optical apparatus such as camera
USRE35775E (en) * 1987-07-23 1998-04-21 Betensky; Ellis I. Zoom lens with short back focal length
US5757556A (en) * 1995-05-10 1998-05-26 Canon Kabushiki Kaisha Zoom lens
US5798873A (en) * 1993-11-25 1998-08-25 Canon Kabushiki Kaisha Small-sized zoom lens
US5831772A (en) * 1993-04-07 1998-11-03 Canon Kabushiki Kaisha Compact zoom lens
US5844725A (en) * 1994-09-06 1998-12-01 Canon Kabushiki Kaisha Zoom lens
US6008953A (en) * 1996-07-26 1999-12-28 Canon Kabushiki Kaisha Zoom lens
US6215600B1 (en) 1997-09-30 2001-04-10 Canon Kabushiki Kaisha Zoom lens
US6219190B1 (en) 1998-11-06 2001-04-17 Canon Kabushiki Kaisha Zoom lens
US6384986B1 (en) 1999-02-02 2002-05-07 Canon Kabushiki Kaisha Zoom lens and optical apparatus having the same
US10983315B2 (en) 2018-02-28 2021-04-20 Canon Kabushiki Kaisha Optical system and imaging apparatus

Cited By (20)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63311224A (en) * 1987-06-12 1988-12-20 Olympus Optical Co Ltd Compact zoom lens
USRE35775E (en) * 1987-07-23 1998-04-21 Betensky; Ellis I. Zoom lens with short back focal length
US4929069A (en) * 1988-09-09 1990-05-29 Nikon Corporation Zoom lens
JPH0273322A (en) * 1988-09-09 1990-03-13 Nikon Corp Miniature zoom lens
JPH02120714A (en) * 1988-10-31 1990-05-08 Canon Inc Zoom lens of small size
US5327290A (en) * 1989-10-13 1994-07-05 Minolta Camera Kabushiki Kaisha Compact size zoom lens system
US5218478A (en) * 1989-11-17 1993-06-08 Canon Kabushiki Kaisha Small-sized zoom lens
US5541773A (en) * 1993-03-26 1996-07-30 Olympus Optical Co., Ltd. Two-unit zoom lens system
US5585971A (en) * 1993-03-30 1996-12-17 Canon Kabushiki Kaisha Small-sized variable magnification lens
US5831772A (en) * 1993-04-07 1998-11-03 Canon Kabushiki Kaisha Compact zoom lens
US5798873A (en) * 1993-11-25 1998-08-25 Canon Kabushiki Kaisha Small-sized zoom lens
JPH07306361A (en) * 1994-05-11 1995-11-21 Canon Inc Compact zoom lens
US5844725A (en) * 1994-09-06 1998-12-01 Canon Kabushiki Kaisha Zoom lens
US5687027A (en) * 1995-03-02 1997-11-11 Canon Kabushiki Kaisha Zoom lens for optical apparatus such as camera
US5757556A (en) * 1995-05-10 1998-05-26 Canon Kabushiki Kaisha Zoom lens
US6008953A (en) * 1996-07-26 1999-12-28 Canon Kabushiki Kaisha Zoom lens
US6215600B1 (en) 1997-09-30 2001-04-10 Canon Kabushiki Kaisha Zoom lens
US6219190B1 (en) 1998-11-06 2001-04-17 Canon Kabushiki Kaisha Zoom lens
US6384986B1 (en) 1999-02-02 2002-05-07 Canon Kabushiki Kaisha Zoom lens and optical apparatus having the same
US10983315B2 (en) 2018-02-28 2021-04-20 Canon Kabushiki Kaisha Optical system and imaging apparatus

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