JPS5719708A - Zoom lens - Google Patents
Zoom lensInfo
- Publication number
- JPS5719708A JPS5719708A JP9326380A JP9326380A JPS5719708A JP S5719708 A JPS5719708 A JP S5719708A JP 9326380 A JP9326380 A JP 9326380A JP 9326380 A JP9326380 A JP 9326380A JP S5719708 A JPS5719708 A JP S5719708A
- Authority
- JP
- Japan
- Prior art keywords
- lens
- positive
- stop
- group
- lenses
- 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
Links
Classifications
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B15/00—Optical objectives with means for varying the magnification
- G02B15/14—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective
- G02B15/142—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective having two groups only
- G02B15/1425—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective having two groups only the first group being negative
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Lenses (AREA)
Abstract
PURPOSE:To eliminate eccentric errors of lenses by disposing a stop between the two positive lenses of a rear group when the refracting powers of the respective groups of a two group zoom lens are intensified for the purpose of miniaturization. CONSTITUTION:This zoom lens consists of a front group 9 having a negative refracting power and a rear group 10 having a positive refracting power, and its focal length is changed by moving both groups in the optical axis direction. The front group is constituted of a positive lens 1, a negative lens 2, and a positive meniscus lens 3 from the object side, and the rear group is constituted of a positive lens 4, a positive meniscus lens 5, a negative lens 6, ane a positive lens 7 successively. A stop is disposed between the lenses 4 and 5, to reduce the influence of the eccentricity of the lens 5 and the lens 6. The space d1 of the stop space and the focal length fM of the lens 5 are so set as to satisfy the relations of the equations I and II with respect to the combined focal length fR of the rear group, whereby the occurrence of spherical aberrations owing to the stop space is prevented and miniaturization is achieved.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP9326380A JPS5719708A (en) | 1980-07-10 | 1980-07-10 | Zoom lens |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP9326380A JPS5719708A (en) | 1980-07-10 | 1980-07-10 | Zoom lens |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS5719708A true JPS5719708A (en) | 1982-02-02 |
Family
ID=14077590
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP9326380A Pending JPS5719708A (en) | 1980-07-10 | 1980-07-10 | Zoom lens |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5719708A (en) |
Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS51144653A (en) * | 1975-06-06 | 1976-12-11 | Canon Inc | Zoom lens system |
JPS5213452A (en) * | 1975-07-23 | 1977-02-01 | Chiyoda Chem Eng Construct Co | Pressure welding rod holder for frictional pressure welder |
JPS5226236A (en) * | 1975-08-22 | 1977-02-26 | Canon Inc | Zoom lens system |
JPS52153752A (en) * | 1976-06-17 | 1977-12-21 | Olympus Optical Co Ltd | Wide angle zoom lens |
JPS5472066A (en) * | 1977-11-18 | 1979-06-09 | Minolta Camera Co Ltd | Divergent refracting power group preceding type two- compoment zoom lens system |
JPS5562421A (en) * | 1978-09-11 | 1980-05-10 | Optigon Res & Dev Corp | Zoom lens |
-
1980
- 1980-07-10 JP JP9326380A patent/JPS5719708A/en active Pending
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS51144653A (en) * | 1975-06-06 | 1976-12-11 | Canon Inc | Zoom lens system |
JPS5213452A (en) * | 1975-07-23 | 1977-02-01 | Chiyoda Chem Eng Construct Co | Pressure welding rod holder for frictional pressure welder |
JPS5226236A (en) * | 1975-08-22 | 1977-02-26 | Canon Inc | Zoom lens system |
JPS52153752A (en) * | 1976-06-17 | 1977-12-21 | Olympus Optical Co Ltd | Wide angle zoom lens |
JPS5472066A (en) * | 1977-11-18 | 1979-06-09 | Minolta Camera Co Ltd | Divergent refracting power group preceding type two- compoment zoom lens system |
JPS5562421A (en) * | 1978-09-11 | 1980-05-10 | Optigon Res & Dev Corp | Zoom lens |
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