JPS5472066A - Divergent refracting power group preceding type two- compoment zoom lens system - Google Patents
Divergent refracting power group preceding type two- compoment zoom lens systemInfo
- Publication number
- JPS5472066A JPS5472066A JP13907377A JP13907377A JPS5472066A JP S5472066 A JPS5472066 A JP S5472066A JP 13907377 A JP13907377 A JP 13907377A JP 13907377 A JP13907377 A JP 13907377A JP S5472066 A JPS5472066 A JP S5472066A
- Authority
- JP
- Japan
- Prior art keywords
- equation
- lens system
- refracting power
- zoom ratio
- corrections
- 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 compose a compact two-component zoom lens system of divergent refracting power group preceding type of relatively high zoom ratio having excellent aberration performance, by overcoming problems such as aberration corrections by setting various conditions shown in equation I.
CONSTITUTION: The stronger the divergency of front group refracting power ϕ1, the larger the zoom ratio Zr can be made, so that the effective diameter of front group 1 may be smaller. This, however, causes limits on the aberration corrections, thereby limiting also the divergency of ϕ1. Therefore, when expanding the zoom ratio to the value of equation I-1, the ratio of refracting powers ϕ1 and ϕ2 of front group I and rear group II is set to the value of equation I-2. Meanwhile, the distance L from the image plane to the front group becomes the minimum when the interval l between the front and rear groups is l=(2ϕ1+ϕ2)/(ϕ1+ϕ2), so that equation I-3 is established. If the upper limit of equation I-4 is exceeded, it is improper from the view point of aberration corrections, and if beneath the lower limit, corrections of strains may be possible. Thus, a compact lens system of high zoom ratio having excellent aberration performance may be obtained.
COPYRIGHT: (C)1979,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP13907377A JPS5472066A (en) | 1977-11-18 | 1977-11-18 | Divergent refracting power group preceding type two- compoment zoom lens system |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP13907377A JPS5472066A (en) | 1977-11-18 | 1977-11-18 | Divergent refracting power group preceding type two- compoment zoom lens system |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS5472066A true JPS5472066A (en) | 1979-06-09 |
JPS6140966B2 JPS6140966B2 (en) | 1986-09-12 |
Family
ID=15236850
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP13907377A Granted JPS5472066A (en) | 1977-11-18 | 1977-11-18 | Divergent refracting power group preceding type two- compoment zoom lens system |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5472066A (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5719708A (en) * | 1980-07-10 | 1982-02-02 | Konishiroku Photo Ind Co Ltd | Zoom lens |
US5434710A (en) * | 1991-12-24 | 1995-07-18 | Olympus Optical Co., Ltd. | Zoom lens system comprising three lens units |
US5644435A (en) * | 1995-01-19 | 1997-07-01 | Mitsubishi Denki Kabushiki Kaisha | Zoom lens system and projection-type display apparatus |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5183543A (en) * | 1975-01-18 | 1976-07-22 | Asahi Optical Co Ltd | |
JPS51144653A (en) * | 1975-06-06 | 1976-12-11 | Canon Inc | Zoom lens system |
JPS5220018A (en) * | 1975-08-07 | 1977-02-15 | Canon Inc | Wide angle zoom lens system |
JPS52134452A (en) * | 1976-05-06 | 1977-11-10 | Nippon Chemical Ind | Wide angle zoom lens system |
-
1977
- 1977-11-18 JP JP13907377A patent/JPS5472066A/en active Granted
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5183543A (en) * | 1975-01-18 | 1976-07-22 | Asahi Optical Co Ltd | |
JPS51144653A (en) * | 1975-06-06 | 1976-12-11 | Canon Inc | Zoom lens system |
JPS5220018A (en) * | 1975-08-07 | 1977-02-15 | Canon Inc | Wide angle zoom lens system |
JPS52134452A (en) * | 1976-05-06 | 1977-11-10 | Nippon Chemical Ind | Wide angle zoom lens system |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5719708A (en) * | 1980-07-10 | 1982-02-02 | Konishiroku Photo Ind Co Ltd | Zoom lens |
US5434710A (en) * | 1991-12-24 | 1995-07-18 | Olympus Optical Co., Ltd. | Zoom lens system comprising three lens units |
US5644435A (en) * | 1995-01-19 | 1997-07-01 | Mitsubishi Denki Kabushiki Kaisha | Zoom lens system and projection-type display apparatus |
Also Published As
Publication number | Publication date |
---|---|
JPS6140966B2 (en) | 1986-09-12 |
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