JPS56143407A - Change-over type variable magnification lens system - Google Patents

Change-over type variable magnification lens system

Info

Publication number
JPS56143407A
JPS56143407A JP4767180A JP4767180A JPS56143407A JP S56143407 A JPS56143407 A JP S56143407A JP 4767180 A JP4767180 A JP 4767180A JP 4767180 A JP4767180 A JP 4767180A JP S56143407 A JPS56143407 A JP S56143407A
Authority
JP
Japan
Prior art keywords
group
lens
lens system
lens group
positive
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
JP4767180A
Other languages
Japanese (ja)
Other versions
JPS6119007B2 (en
Inventor
Keiji Ikemori
Kazuo Tanaka
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.)
Canon Inc
Original Assignee
Canon Inc
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 Canon Inc filed Critical Canon Inc
Priority to JP4767180A priority Critical patent/JPS56143407A/en
Priority to US06/244,780 priority patent/US4466707A/en
Priority to DE19813110797 priority patent/DE3110797A1/en
Publication of JPS56143407A publication Critical patent/JPS56143407A/en
Publication of JPS6119007B2 publication Critical patent/JPS6119007B2/ja
Granted 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
    • G02B15/02—Optical objectives with means for varying the magnification by changing, adding, or subtracting a part of the objective, e.g. convertible objective

Landscapes

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

Abstract

PURPOSE:To make the extent of extension with respect to the same object distance the same despite magnification changing by changing magnification by the movement of the 1st group lens on the optical axis and the change-over of the 2nd lens group to the other lens group of different refracting powers in a lens system consisting of 3-group lenses of positive, negative and positive successively from the object side. CONSTITUTION:In the lens system consisting of the positive 1st lens group 1, the negative 2nd lens group 2-1 and the positive 3rd lens group, the 2nd lens group 2-1 is substituted with the other lens system 2-2 of a different refracting power, and the 1st group lens system 1 is moved to the object side, whereby the focus is made longer. Focusing is accomplished by moving the 2nd lens group 2-1 or 2-2 on the optical axis. Thereby, the extent of extension with respect to the same object distance is made the same despite magnification changing.
JP4767180A 1980-03-21 1980-04-11 Change-over type variable magnification lens system Granted JPS56143407A (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
JP4767180A JPS56143407A (en) 1980-04-11 1980-04-11 Change-over type variable magnification lens system
US06/244,780 US4466707A (en) 1980-03-21 1981-03-17 Variable magnification lens system
DE19813110797 DE3110797A1 (en) 1980-03-21 1981-03-19 Lens system having variable magnification

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP4767180A JPS56143407A (en) 1980-04-11 1980-04-11 Change-over type variable magnification lens system

Publications (2)

Publication Number Publication Date
JPS56143407A true JPS56143407A (en) 1981-11-09
JPS6119007B2 JPS6119007B2 (en) 1986-05-15

Family

ID=12781720

Family Applications (1)

Application Number Title Priority Date Filing Date
JP4767180A Granted JPS56143407A (en) 1980-03-21 1980-04-11 Change-over type variable magnification lens system

Country Status (1)

Country Link
JP (1) JPS56143407A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58108510A (en) * 1981-12-23 1983-06-28 Canon Inc Switching type variable power lens system
US4668054A (en) * 1984-04-20 1987-05-26 Olympus Optical Co., Ltd. Vari-focal photographic lens system of lens group exchange type
JP2012027349A (en) * 2010-07-27 2012-02-09 Olympus Imaging Corp Imaging optical system and image pickup device including the same

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58108510A (en) * 1981-12-23 1983-06-28 Canon Inc Switching type variable power lens system
JPS6155091B2 (en) * 1981-12-23 1986-11-26 Canon Kk
US4668054A (en) * 1984-04-20 1987-05-26 Olympus Optical Co., Ltd. Vari-focal photographic lens system of lens group exchange type
JP2012027349A (en) * 2010-07-27 2012-02-09 Olympus Imaging Corp Imaging optical system and image pickup device including the same

Also Published As

Publication number Publication date
JPS6119007B2 (en) 1986-05-15

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