JPS57169717A - Telecentric zoom lens - Google Patents

Telecentric zoom lens

Info

Publication number
JPS57169717A
JPS57169717A JP56055038A JP5503881A JPS57169717A JP S57169717 A JPS57169717 A JP S57169717A JP 56055038 A JP56055038 A JP 56055038A JP 5503881 A JP5503881 A JP 5503881A JP S57169717 A JPS57169717 A JP S57169717A
Authority
JP
Japan
Prior art keywords
group
positive
zoom lens
negative
telecentric zoom
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
JP56055038A
Other languages
Japanese (ja)
Inventor
Hiroshi Miyamae
Makoto Sakano
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.)
Konica Minolta Inc
Original Assignee
Konica Minolta 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 Konica Minolta Inc filed Critical Konica Minolta Inc
Priority to JP56055038A priority Critical patent/JPS57169717A/en
Priority to US06/365,646 priority patent/US4637690A/en
Publication of JPS57169717A publication Critical patent/JPS57169717A/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
    • G02B15/16—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
    • G02B15/173—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 arranged +-+
    • 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
    • G02B15/145—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 five groups only
    • G02B15/1451—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 five groups only the first group being positive
    • G02B15/145121—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 five groups only the first group being positive arranged +-+-+

Abstract

PURPOSE:To obtain a telecentric zoom lens with the distortion corrected well, by providing five groups, a positive group, a negative group, a positive group, a negative group, and a positive group and satisfying prescribed conditions. CONSTITUTION:The telecentric zoom lens consists of the first positive group, the second negative group, the third positive group, the fourth negative group, and the fifth positive group, and the first group and the fifth group are fixed, and the second group and the fourth group are moved on the optical axis toward the first group and the third group is moved on the optical axis in the opposite direction in accordance with the magnification varying of the whole of the system from the longer focus end to the shorter focus end, and a diaphragm is fixed to the third group. These groups satisfy conditions of expressionsI-III where fW and fi are the focal length of the shorter focus end and the focal length of the i-th group, respectively.
JP56055038A 1981-04-06 1981-04-14 Telecentric zoom lens Pending JPS57169717A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
JP56055038A JPS57169717A (en) 1981-04-14 1981-04-14 Telecentric zoom lens
US06/365,646 US4637690A (en) 1981-04-06 1982-04-05 Telecentric zoom lens system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP56055038A JPS57169717A (en) 1981-04-14 1981-04-14 Telecentric zoom lens

Publications (1)

Publication Number Publication Date
JPS57169717A true JPS57169717A (en) 1982-10-19

Family

ID=12987483

Family Applications (1)

Application Number Title Priority Date Filing Date
JP56055038A Pending JPS57169717A (en) 1981-04-06 1981-04-14 Telecentric zoom lens

Country Status (1)

Country Link
JP (1) JPS57169717A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0297361A2 (en) * 1987-06-19 1989-01-04 Dainippon Screen Mfg. Co., Ltd. Telecentric image-forming system having variable magnifications
JP2006337745A (en) * 2005-06-02 2006-12-14 Canon Inc Zoom lens and image pickup unit having the same

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57165810A (en) * 1981-04-06 1982-10-13 Konishiroku Photo Ind Co Ltd Telecentric zoom lens

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57165810A (en) * 1981-04-06 1982-10-13 Konishiroku Photo Ind Co Ltd Telecentric zoom lens

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0297361A2 (en) * 1987-06-19 1989-01-04 Dainippon Screen Mfg. Co., Ltd. Telecentric image-forming system having variable magnifications
JP2006337745A (en) * 2005-06-02 2006-12-14 Canon Inc Zoom lens and image pickup unit having the same

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