JPS5778513A - Zoom lens system - Google Patents
Zoom lens systemInfo
- Publication number
- JPS5778513A JPS5778513A JP55154050A JP15405080A JPS5778513A JP S5778513 A JPS5778513 A JP S5778513A JP 55154050 A JP55154050 A JP 55154050A JP 15405080 A JP15405080 A JP 15405080A JP S5778513 A JPS5778513 A JP S5778513A
- Authority
- JP
- Japan
- Prior art keywords
- group
- fixed
- diaphragm
- lens group
- reduction
- 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
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
- G02B15/163—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 first movable lens or lens group and a second movable lens or lens group, both in front of a fixed lens or lens group
- G02B15/167—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 first movable lens or lens group and a second movable lens or lens group, both in front of a fixed lens or lens group having an additional fixed 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
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Nonlinear Science (AREA)
- Lenses (AREA)
Abstract
PURPOSE:To realize the infocus state to an approximate object, by shifting the lens group at the back of the diaphragm of a fixed rear group in a magnification and reduction system comprising a fixed front group, a magnification and reduction lens group including a variator and a compensator and the above-mentioned fixed rear group respectively. CONSTITUTION:A zoom lens system comprises a fixed front groupI, a variation and reduction lens group II including a variator and a compensator and a rear group III which is totally fixed and contains a diaphragm S at its front or inside part in that order from the side of an object. A mobile lens group F having the positive refractive power is provided at the side of an image from the diaphragm in the group III, and this group F is shifted toward the object to perform the focusing to an approximate object. The ratio between the focal distance fF of the group F and the focal distance of the group III is set at 0.2-2, and as a result a well- balanced compensation is possible to the aberration fluctuation caused by the focusing.
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP55154050A JPS5778513A (en) | 1980-11-04 | 1980-11-04 | Zoom lens system |
US06/318,144 US4492437A (en) | 1980-11-04 | 1981-11-04 | Zoom lens system |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP55154050A JPS5778513A (en) | 1980-11-04 | 1980-11-04 | Zoom lens system |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS5778513A true JPS5778513A (en) | 1982-05-17 |
JPH0125043B2 JPH0125043B2 (en) | 1989-05-16 |
Family
ID=15575811
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP55154050A Granted JPS5778513A (en) | 1980-11-04 | 1980-11-04 | Zoom lens system |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5778513A (en) |
Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS592235U (en) * | 1982-06-30 | 1984-01-09 | 中川 盛雄 | Drawer handle fixture |
JPS5945980U (en) * | 1982-09-17 | 1984-03-27 | 戸塚 忠男 | cord holder |
JPS5946589U (en) * | 1982-09-20 | 1984-03-28 | 松下電器産業株式会社 | Game top board |
JPS5949141U (en) * | 1982-09-21 | 1984-04-02 | 株式会社コロナ | Water heater safety device |
JPS5955538U (en) * | 1982-10-05 | 1984-04-11 | 住友ベークライト株式会社 | Medical composite tube |
US4650291A (en) * | 1982-08-13 | 1987-03-17 | Canon Kabushiki Kaisha | Zoom lens |
US4701034A (en) * | 1984-03-02 | 1987-10-20 | Olympus Optical Co., Ltd. | Large aperture zoom lens system |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS4832387A (en) * | 1971-08-31 | 1973-04-28 | ||
JPS5215226A (en) * | 1975-07-25 | 1977-02-04 | Sony Corp | Color demodulation circuit |
JPS52117126A (en) * | 1976-03-26 | 1977-10-01 | Minolta Camera Co Ltd | Telephoto lens system |
JPS5366226A (en) * | 1976-11-25 | 1978-06-13 | Bell & Howell Japan | Focusing system for zoom lens |
JPS54155834A (en) * | 1978-05-29 | 1979-12-08 | Bell & Howell Japan | Large aperture ratio zoom lens |
-
1980
- 1980-11-04 JP JP55154050A patent/JPS5778513A/en active Granted
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS4832387A (en) * | 1971-08-31 | 1973-04-28 | ||
JPS5215226A (en) * | 1975-07-25 | 1977-02-04 | Sony Corp | Color demodulation circuit |
JPS52117126A (en) * | 1976-03-26 | 1977-10-01 | Minolta Camera Co Ltd | Telephoto lens system |
JPS5366226A (en) * | 1976-11-25 | 1978-06-13 | Bell & Howell Japan | Focusing system for zoom lens |
JPS54155834A (en) * | 1978-05-29 | 1979-12-08 | Bell & Howell Japan | Large aperture ratio zoom lens |
Cited By (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS592235U (en) * | 1982-06-30 | 1984-01-09 | 中川 盛雄 | Drawer handle fixture |
US4650291A (en) * | 1982-08-13 | 1987-03-17 | Canon Kabushiki Kaisha | Zoom lens |
JPS5945980U (en) * | 1982-09-17 | 1984-03-27 | 戸塚 忠男 | cord holder |
JPS5946589U (en) * | 1982-09-20 | 1984-03-28 | 松下電器産業株式会社 | Game top board |
JPS5949141U (en) * | 1982-09-21 | 1984-04-02 | 株式会社コロナ | Water heater safety device |
JPH0116993Y2 (en) * | 1982-09-21 | 1989-05-18 | ||
JPS5955538U (en) * | 1982-10-05 | 1984-04-11 | 住友ベークライト株式会社 | Medical composite tube |
US4701034A (en) * | 1984-03-02 | 1987-10-20 | Olympus Optical Co., Ltd. | Large aperture zoom lens system |
Also Published As
Publication number | Publication date |
---|---|
JPH0125043B2 (en) | 1989-05-16 |
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