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JPS54127321A - Zoom lens - Google Patents

Zoom lens

Info

Publication number
JPS54127321A
JPS54127321A JP3461878A JP3461878A JPS54127321A JP S54127321 A JPS54127321 A JP S54127321A JP 3461878 A JP3461878 A JP 3461878A JP 3461878 A JP3461878 A JP 3461878A JP S54127321 A JPS54127321 A JP S54127321A
Authority
JP
Japan
Prior art keywords
moved
groups
lenses
zooming
group
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.)
Pending
Application number
JP3461878A
Other languages
Japanese (ja)
Inventor
Kazuo Tanaka
Takamasa Hirose
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.)
Canon Inc
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 JP3461878A priority Critical patent/JPS54127321A/en
Publication of JPS54127321A publication Critical patent/JPS54127321A/en
Pending legal-status Critical Current

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  • Lenses (AREA)

Abstract

PURPOSE: To prevent the decrease in zoom ratio owing to subject distance by monotonously changing the respective image forming ratios of two groups of lenses cooperatively moving at the zooming.
CONSTITUTION: When one of the 2nd, 3rd groups 12, 13 between the stationary 1st, 4th group lenses 11, 14 is moved, the focus is adjusted according to the distance of the moving object and when the lenses 12, 13 are cooperatively moved, zooming is accomplished. When the 2nd group 12 is linearly moved toward the direction of the image and the 3rd group 13 is moved non-linearly in the same direction at this cooperative moving, the image forming magnification of the 2nd, 3rd groups 12, 13 monotonously changes according to the movement quantity. Then, even if the subject distance becomes small, the zoom ratio becomes constant without decreasing and good zooming may be accomplished.
COPYRIGHT: (C)1979,JPO&Japio
JP3461878A 1978-03-25 1978-03-25 Zoom lens Pending JPS54127321A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP3461878A JPS54127321A (en) 1978-03-25 1978-03-25 Zoom lens

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP3461878A JPS54127321A (en) 1978-03-25 1978-03-25 Zoom lens

Publications (1)

Publication Number Publication Date
JPS54127321A true JPS54127321A (en) 1979-10-03

Family

ID=12419356

Family Applications (1)

Application Number Title Priority Date Filing Date
JP3461878A Pending JPS54127321A (en) 1978-03-25 1978-03-25 Zoom lens

Country Status (1)

Country Link
JP (1) JPS54127321A (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58143312A (en) * 1982-02-19 1983-08-25 Minolta Camera Co Ltd Zoom lens system
JPS6190119A (en) * 1984-10-10 1986-05-08 Canon Inc Zoom lens
DE3546211A1 (en) * 1984-12-28 1986-07-03 Canon K.K., Tokio/Tokyo VARIO LENS WITH AN ELEMENT WITH VARIABLE BREAKING POWER
JPS6243615A (en) * 1985-08-22 1987-02-25 Canon Inc Zoom lens with large aperture ratio
US5136431A (en) * 1988-12-06 1992-08-04 Canon Kabushiki Kaisha Zoom lens of the internal focus type

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS49115322A (en) * 1973-03-06 1974-11-05
JPS5036118A (en) * 1973-08-02 1975-04-05
JPS5037431A (en) * 1973-08-06 1975-04-08

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS49115322A (en) * 1973-03-06 1974-11-05
JPS5036118A (en) * 1973-08-02 1975-04-05
JPS5037431A (en) * 1973-08-06 1975-04-08

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58143312A (en) * 1982-02-19 1983-08-25 Minolta Camera Co Ltd Zoom lens system
JPS6190119A (en) * 1984-10-10 1986-05-08 Canon Inc Zoom lens
DE3546211A1 (en) * 1984-12-28 1986-07-03 Canon K.K., Tokio/Tokyo VARIO LENS WITH AN ELEMENT WITH VARIABLE BREAKING POWER
DE3546211C2 (en) * 1984-12-28 1991-07-25 Canon K.K., Tokio/Tokyo, Jp
JPS6243615A (en) * 1985-08-22 1987-02-25 Canon Inc Zoom lens with large aperture ratio
US5136431A (en) * 1988-12-06 1992-08-04 Canon Kabushiki Kaisha Zoom lens of the internal focus type

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