JPS56158315A - Zoom lens system - Google Patents

Zoom lens system

Info

Publication number
JPS56158315A
JPS56158315A JP6204580A JP6204580A JPS56158315A JP S56158315 A JPS56158315 A JP S56158315A JP 6204580 A JP6204580 A JP 6204580A JP 6204580 A JP6204580 A JP 6204580A JP S56158315 A JPS56158315 A JP S56158315A
Authority
JP
Japan
Prior art keywords
lens
negative
positive
front group
image side
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
Application number
JP6204580A
Other languages
Japanese (ja)
Inventor
Shuji Ogino
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 JP6204580A priority Critical patent/JPS56158315A/en
Publication of JPS56158315A publication Critical patent/JPS56158315A/en
Pending legal-status Critical Current

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
    • G02B15/1421—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 positive

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Lenses (AREA)

Abstract

PURPOSE:To reduce the aberration and at the same time realize a compact structure for a double component zoom lens system having about a double zoom ratio, by forming the front group with a negative meniscus lens, a negative lens and a positive meniscus lens and the rear group with two positive lenses, a negative lens and a positive lens respectively to satisfy various terms. CONSTITUTION:A double component zoom lens system consists of the front group having a negative refractive power as a whole and the rear group having a positive refractive power as a whole. The front group consists of a negative meniscus lens L1 with the concave side turned to the image side, a negative lens L2 and a positive meniscus lens L3 with the concave side turned to the image side in that order from the side of an object. The rear group consists of two positiv lenses L4 and L5, a negative lens L6 having a large curvature surface at the image side and a positive lens L7. Then the terms (1)-(4) are satified, where fL and fI are synthetic focal distance of the full system and the front group I and d4 is an air space between L2 and L3.
JP6204580A 1980-05-10 1980-05-10 Zoom lens system Pending JPS56158315A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP6204580A JPS56158315A (en) 1980-05-10 1980-05-10 Zoom lens system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP6204580A JPS56158315A (en) 1980-05-10 1980-05-10 Zoom lens system

Publications (1)

Publication Number Publication Date
JPS56158315A true JPS56158315A (en) 1981-12-07

Family

ID=13188790

Family Applications (1)

Application Number Title Priority Date Filing Date
JP6204580A Pending JPS56158315A (en) 1980-05-10 1980-05-10 Zoom lens system

Country Status (1)

Country Link
JP (1) JPS56158315A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59142515A (en) * 1983-02-02 1984-08-15 Asahi Optical Co Ltd Zoom lens
JPS6159306A (en) * 1984-08-30 1986-03-26 Nippon Kogaku Kk <Nikon> Lens with variable focal length
US5539581A (en) * 1994-06-17 1996-07-23 Nikon Corp. Zoom lens system

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59142515A (en) * 1983-02-02 1984-08-15 Asahi Optical Co Ltd Zoom lens
JPS6159306A (en) * 1984-08-30 1986-03-26 Nippon Kogaku Kk <Nikon> Lens with variable focal length
US5539581A (en) * 1994-06-17 1996-07-23 Nikon Corp. Zoom lens system

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