JPS56165107A - Focusing device for zoom lens - Google Patents
Focusing device for zoom lensInfo
- Publication number
- JPS56165107A JPS56165107A JP6913480A JP6913480A JPS56165107A JP S56165107 A JPS56165107 A JP S56165107A JP 6913480 A JP6913480 A JP 6913480A JP 6913480 A JP6913480 A JP 6913480A JP S56165107 A JPS56165107 A JP S56165107A
- Authority
- JP
- Japan
- Prior art keywords
- lens
- lens group
- move
- group
- change
- 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
- G02B7/00—Mountings, adjusting means, or light-tight connections, for optical elements
- G02B7/02—Mountings, adjusting means, or light-tight connections, for optical elements for lenses
- G02B7/04—Mountings, adjusting means, or light-tight connections, for optical elements for lenses with mechanism for focusing or varying magnification
- G02B7/10—Mountings, adjusting means, or light-tight connections, for optical elements for lenses with mechanism for focusing or varying magnification by relative axial movement of several lenses, e.g. of varifocal objective lens
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Lens Barrels (AREA)
- Lenses (AREA)
Abstract
PURPOSE:To prevent a change of an amount delivered for matching of a focal point of a lense against a change of a focal distance by dividing the fourth group lens system into a plurality of lenses and by making them move in connection with zooming to cause a composed refractive power to change in a four component mechanically correcting system zoom lens where it comprises four groups and the focal points is matched by moving the lens system. CONSTITUTION:A paraxial lens construction in a zoom lens consists of the positive first lens group 1, the negative second lens group 2, the positive third lens group and the fourth lens group comprising a positive lens 4a and a negative lens 4b that move when focusing. The first lens group 1 and the third lens group 3 move in a body and the focal length is changed by permitting the second group to move in a form of a curved line. In interlock with a zoom operation lenses 4a, 4b in the fourth lens group move with a changed separation to change the composite refractive power. Pins 15, 16 extruded to the sides of each frame of the lens group 4a, 4b a key groove 11 constructed in a zoom operating ring move along slots 9, 10 of a lens barrel 17 moved back and forth by a motor M.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP6913480A JPS56165107A (en) | 1980-05-23 | 1980-05-23 | Focusing device for zoom lens |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP6913480A JPS56165107A (en) | 1980-05-23 | 1980-05-23 | Focusing device for zoom lens |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS56165107A true JPS56165107A (en) | 1981-12-18 |
JPS6356962B2 JPS6356962B2 (en) | 1988-11-09 |
Family
ID=13393864
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP6913480A Granted JPS56165107A (en) | 1980-05-23 | 1980-05-23 | Focusing device for zoom lens |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS56165107A (en) |
Cited By (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS58136012A (en) * | 1982-02-08 | 1983-08-12 | Canon Inc | Focusing method of zoom lens |
JPS58202416A (en) * | 1982-05-19 | 1983-11-25 | Minolta Camera Co Ltd | Zoom lens system of high variable magnification ratio containing wide angle area |
JPS58195214U (en) * | 1982-06-23 | 1983-12-26 | ミノルタ株式会社 | Zoom lens for autofocus camera |
US4636040A (en) * | 1982-02-19 | 1987-01-13 | Minolta Camera Kabushiki Kaisha | Zoom lens system |
US4699475A (en) * | 1981-11-04 | 1987-10-13 | Nippon Kogaku K. K. | Zoom lens including a wide angle of view |
US5014077A (en) * | 1985-05-15 | 1991-05-07 | Canon Kabushiki Kaisha | Camera with variable focal length optical system |
US5185678A (en) * | 1990-07-11 | 1993-02-09 | Minolta Camera Kabushiki Kaisha | Compact high ratio zoom lens system |
USRE34453E (en) * | 1986-10-11 | 1993-11-23 | Minolta Camera Kabushiki Kaisha | Photographic camera |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5266445A (en) * | 1975-11-27 | 1977-06-01 | Fuji Photo Optical Co Ltd | Zoom lens |
US4043642A (en) * | 1973-03-06 | 1977-08-23 | Canon Kabushiki Kaisha | Zoom lens system having electrical control of moving elements |
JPS5366224A (en) * | 1976-11-25 | 1978-06-13 | Bell & Howell Japan | Autoofocusing system in zoom lens |
JPS5366223A (en) * | 1976-11-25 | 1978-06-13 | Bell & Howell Japan | Focusing system in zoom lens and autoofocusing system |
-
1980
- 1980-05-23 JP JP6913480A patent/JPS56165107A/en active Granted
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4043642A (en) * | 1973-03-06 | 1977-08-23 | Canon Kabushiki Kaisha | Zoom lens system having electrical control of moving elements |
JPS5266445A (en) * | 1975-11-27 | 1977-06-01 | Fuji Photo Optical Co Ltd | Zoom lens |
JPS5366224A (en) * | 1976-11-25 | 1978-06-13 | Bell & Howell Japan | Autoofocusing system in zoom lens |
JPS5366223A (en) * | 1976-11-25 | 1978-06-13 | Bell & Howell Japan | Focusing system in zoom lens and autoofocusing system |
Cited By (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4699475A (en) * | 1981-11-04 | 1987-10-13 | Nippon Kogaku K. K. | Zoom lens including a wide angle of view |
JPS58136012A (en) * | 1982-02-08 | 1983-08-12 | Canon Inc | Focusing method of zoom lens |
US4636040A (en) * | 1982-02-19 | 1987-01-13 | Minolta Camera Kabushiki Kaisha | Zoom lens system |
US4844600A (en) * | 1982-02-19 | 1989-07-04 | Minolta Camera Kabushiki Kaisha | Zoom lens system |
JPS58202416A (en) * | 1982-05-19 | 1983-11-25 | Minolta Camera Co Ltd | Zoom lens system of high variable magnification ratio containing wide angle area |
JPH0529885B2 (en) * | 1982-05-19 | 1993-05-06 | Minolta Camera Kk | |
JPS58195214U (en) * | 1982-06-23 | 1983-12-26 | ミノルタ株式会社 | Zoom lens for autofocus camera |
US5014077A (en) * | 1985-05-15 | 1991-05-07 | Canon Kabushiki Kaisha | Camera with variable focal length optical system |
USRE34453E (en) * | 1986-10-11 | 1993-11-23 | Minolta Camera Kabushiki Kaisha | Photographic camera |
US5185678A (en) * | 1990-07-11 | 1993-02-09 | Minolta Camera Kabushiki Kaisha | Compact high ratio zoom lens system |
Also Published As
Publication number | Publication date |
---|---|
JPS6356962B2 (en) | 1988-11-09 |
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