JPS56165107A - Focusing device for zoom lens - Google Patents

Focusing device for zoom lens

Info

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
Application number
JP6913480A
Other languages
Japanese (ja)
Other versions
JPS6356962B2 (en
Inventor
Mitsuo Yasukuni
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Minolta Co Ltd
Original Assignee
Minolta Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Minolta Co Ltd filed Critical Minolta Co Ltd
Priority to JP6913480A priority Critical patent/JPS56165107A/en
Publication of JPS56165107A publication Critical patent/JPS56165107A/en
Publication of JPS6356962B2 publication Critical patent/JPS6356962B2/ja
Granted legal-status Critical Current

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.
JP6913480A 1980-05-23 1980-05-23 Focusing device for zoom lens Granted JPS56165107A (en)

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)

* Cited by examiner, † Cited by third party
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)

* Cited by examiner, † Cited by third party
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

Patent Citations (4)

* Cited by examiner, † Cited by third party
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)

* Cited by examiner, † Cited by third party
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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