JPS575023A - Zoom lens system - Google Patents
Zoom lens systemInfo
- Publication number
- JPS575023A JPS575023A JP7924480A JP7924480A JPS575023A JP S575023 A JPS575023 A JP S575023A JP 7924480 A JP7924480 A JP 7924480A JP 7924480 A JP7924480 A JP 7924480A JP S575023 A JPS575023 A JP S575023A
- Authority
- JP
- Japan
- Prior art keywords
- lens group
- lens
- focus side
- spacing
- long focus
- 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
- G02B15/16—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 with interdependent non-linearly related movements between one lens or lens group, and another lens or lens group
- G02B15/177—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 with interdependent non-linearly related movements between one lens or lens group, and another lens or lens group having a negative front lens or group of lenses
-
- 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
- G02B15/143—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 three groups only
- G02B15/1435—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 three groups only the first group being negative
- G02B15/143503—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 three groups only the first group being negative arranged -+-
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Nonlinear Science (AREA)
- Lenses (AREA)
Abstract
PURPOSE:To obtain a lens system of large wide angle zoom ratios and good various aberrations by moving the lens system in such a manner that the spacing between an objective lens group and an intermediate lens group decreases on the long focus side and that the spacing between the intermediate lens group and an eyepiece lens group increases on the long focus side. CONSTITUTION:Specifications of the lens are set as by the equations in order to change the focal length of the entire system while maintaining an image plane position constant. Namely, the lens system consists of an objective lens group L1 having negative refracting power, an intermediate lens group L2 having positive refracting power and an eyepiece lens group L3 having negative refracting power, and the spacing between the lens group L1, L2 on the short focus side decreases on the long focus side, and the spacing between the lens groups L2, L3 on the short focus side increases on the long focus side. The relations of the lens groups L1, L2 are formed by the conditions of an ordinary two component zoom, and the relations of the lens groups L2, L3 are formed by the conditions constituting a telephoto type. Hence, the correction of aberrations and miniaturization are accomplished by the symmetry and degrees of freedom of power disposition by the eyepiece lens group L3, and the lens system of small Petzval sum is obtained.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7924480A JPS575023A (en) | 1980-06-11 | 1980-06-11 | Zoom lens system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7924480A JPS575023A (en) | 1980-06-11 | 1980-06-11 | Zoom lens system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS575023A true JPS575023A (en) | 1982-01-11 |
Family
ID=13684436
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP7924480A Pending JPS575023A (en) | 1980-06-11 | 1980-06-11 | Zoom lens system |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS575023A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS58111013A (en) * | 1981-12-24 | 1983-07-01 | Canon Inc | Small-sized wide angle zoom lens |
| JPH03501416A (en) * | 1988-05-27 | 1991-03-28 | イーストマン・コダック・カンパニー | Compact wide-angle close-focus SLR camera zoom lens |
| US5434710A (en) * | 1991-12-24 | 1995-07-18 | Olympus Optical Co., Ltd. | Zoom lens system comprising three lens units |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS4923912A (en) * | 1972-07-03 | 1974-03-02 |
-
1980
- 1980-06-11 JP JP7924480A patent/JPS575023A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS4923912A (en) * | 1972-07-03 | 1974-03-02 |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS58111013A (en) * | 1981-12-24 | 1983-07-01 | Canon Inc | Small-sized wide angle zoom lens |
| JPS6161653B2 (en) * | 1981-12-24 | 1986-12-26 | Canon Kk | |
| JPH03501416A (en) * | 1988-05-27 | 1991-03-28 | イーストマン・コダック・カンパニー | Compact wide-angle close-focus SLR camera zoom lens |
| US5434710A (en) * | 1991-12-24 | 1995-07-18 | Olympus Optical Co., Ltd. | Zoom lens system comprising three lens units |
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