JPS55121418A - Zoom lens - Google Patents
Zoom lensInfo
- 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
- groups
- lenses
- cemented
- concave
- 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
Links
Landscapes
- Lenses (AREA)
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
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP3037779A JPS55121418A (en) | 1979-03-15 | 1979-03-15 | Zoom lens |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP3037779A JPS55121418A (en) | 1979-03-15 | 1979-03-15 | Zoom lens |
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 |
---|---|---|---|
JP3037779A Granted JPS55121418A (en) | 1979-03-15 | 1979-03-15 | Zoom lens |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS55121418A (en) |
Cited By (2)
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)
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 |
-
1979
- 1979-03-15 JP JP3037779A patent/JPS55121418A/en active Granted
Patent Citations (3)
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)
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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