JPS55121418A - Zoom lens - Google Patents

Zoom lens

Info

Publication number
JPS55121418A
JPS55121418A JP3037779A JP3037779A JPS55121418A JP S55121418 A JPS55121418 A JP S55121418A JP 3037779 A JP3037779 A JP 3037779A JP 3037779 A JP3037779 A JP 3037779A JP S55121418 A JPS55121418 A JP S55121418A
Authority
JP
Japan
Prior art keywords
lens
lenses
groups
concave
cemented
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
JP3037779A
Other languages
Japanese (ja)
Other versions
JPS6144287B2 (en
Inventor
Keiji Ikemori
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 JP54030377A priority Critical patent/JPS6144287B2/ja
Publication of JPS55121418A publication Critical patent/JPS55121418A/en
Publication of JPS6144287B2 publication Critical patent/JPS6144287B2/ja
Expired legal-status Critical Current

Links

Abstract

PURPOSE: To provide the focal length range from near standard up to telephoto by the lens group consisting of 4 groups, which 1st to 4th group lenses respectively having actions of focusing, variable power, maintenance of image plane in a fixed position and fixing during zooming and satisfying the specified conditions.
CONSTITUTION: The lens of good aberration correction may be obtained if the conditions of formulas (1)W(6) are satisfied where the biconvex lens, cemented lens and cemented meniscus positive lens out of the 4th to the 1st lens groups are let 4-1-1, 4-1-2, 4-1-3 lens respectively and where the refractive index of the 4-1-1 lens is let Na, the refractive indices and Abbe numbers of the convex lens and concave lens of the 4-1-2 lens and the concave lens and convex lens of the 4-1-3 lens are let Nb, Nc, Ne, Nf, μb, μc, μe, μf, respectively and the focal lengths of the 4-1-1, 4-1-2, 4-1-3 lenses Fa, Fb, Fc respectively.
COPYRIGHT: (C)1980,JPO&Japio
JP54030377A 1979-03-15 1979-03-15 Expired JPS6144287B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP54030377A JPS6144287B2 (en) 1979-03-15 1979-03-15

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP54030377A JPS6144287B2 (en) 1979-03-15 1979-03-15

Publications (2)

Publication Number Publication Date
JPS55121418A true JPS55121418A (en) 1980-09-18
JPS6144287B2 JPS6144287B2 (en) 1986-10-02

Family

ID=12302180

Family Applications (1)

Application Number Title Priority Date Filing Date
JP54030377A Expired JPS6144287B2 (en) 1979-03-15 1979-03-15

Country Status (1)

Country Link
JP (1) JPS6144287B2 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4359270A (en) * 1980-03-24 1982-11-16 Asahi Kogaku Kogyo Kabushiki Kaisha Zoom lens
JPS5846313A (en) * 1981-09-16 1983-03-17 Hitachi Ltd Zoom lens

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4960240A (en) * 1972-10-09 1974-06-11
JPS50109739A (en) * 1974-02-04 1975-08-29
JPS5291449A (en) * 1976-01-28 1977-08-01 Canon Inc Zoom lens which is good in near range focusing function

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4960240A (en) * 1972-10-09 1974-06-11
JPS50109739A (en) * 1974-02-04 1975-08-29
JPS5291449A (en) * 1976-01-28 1977-08-01 Canon Inc Zoom lens which is good in near range focusing function

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4359270A (en) * 1980-03-24 1982-11-16 Asahi Kogaku Kogyo Kabushiki Kaisha Zoom lens
JPS5846313A (en) * 1981-09-16 1983-03-17 Hitachi Ltd Zoom lens
JPH0237562B2 (en) * 1981-09-16 1990-08-24 Hitachi Ltd

Also Published As

Publication number Publication date
JPS6144287B2 (en) 1986-10-02

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