JPS57186728A - Lens for copying machine - Google Patents

Lens for copying machine

Info

Publication number
JPS57186728A
JPS57186728A JP7247381A JP7247381A JPS57186728A JP S57186728 A JPS57186728 A JP S57186728A JP 7247381 A JP7247381 A JP 7247381A JP 7247381 A JP7247381 A JP 7247381A JP S57186728 A JPS57186728 A JP S57186728A
Authority
JP
Japan
Prior art keywords
lens
copying machine
main lens
parameters
varying
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
JP7247381A
Other languages
Japanese (ja)
Inventor
Sho Tokumaru
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 JP7247381A priority Critical patent/JPS57186728A/en
Publication of JPS57186728A publication Critical patent/JPS57186728A/en
Pending legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B13/00—Optical objectives specially designed for the purposes specified below
    • G02B13/24—Optical objectives specially designed for the purposes specified below for reproducing or copying at short object distances

Landscapes

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

Abstract

PURPOSE:To realize compact constitution by using a four-element symmetric cella type, adding an auxiliary lens for magnification variation while moving this main lens, and thus varying focal length without varying conjugate length. CONSTITUTION:A main lens A has -x copying magnification, 241.89 focal length, and effective No.10.0 while having parameters so that r1=-r8=84.620, r2=-r7=-200.304, r3=-r6=-109.121, and r4=-r5=116.330, d1=d7=19.08, d2= d6=5.23, d3=d5=4.56, and d4=5.71, n1=n4=1.6779 and n2=n3=1.57616, and nu1=nu4=55.4 and nu2=nu3=41.4. For magnification variation, an auxiliary lens B having parameters so that r9=-683.57 and r10=-624.49, d8=5.0 and d9=5.0, n5=1.5168, and nu5=64.1 is added to the main lens A.
JP7247381A 1981-05-13 1981-05-13 Lens for copying machine Pending JPS57186728A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP7247381A JPS57186728A (en) 1981-05-13 1981-05-13 Lens for copying machine

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP7247381A JPS57186728A (en) 1981-05-13 1981-05-13 Lens for copying machine

Publications (1)

Publication Number Publication Date
JPS57186728A true JPS57186728A (en) 1982-11-17

Family

ID=13490316

Family Applications (1)

Application Number Title Priority Date Filing Date
JP7247381A Pending JPS57186728A (en) 1981-05-13 1981-05-13 Lens for copying machine

Country Status (1)

Country Link
JP (1) JPS57186728A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10371927B2 (en) 2014-12-30 2019-08-06 Largan Precision Co., Ltd. Photographing optical lens assembly, image capturing device and electronic device
US11262545B2 (en) 2019-07-19 2022-03-01 Largan Precision Co., Ltd. Imaging lens assembly, image capturing unit and electronic device

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10371927B2 (en) 2014-12-30 2019-08-06 Largan Precision Co., Ltd. Photographing optical lens assembly, image capturing device and electronic device
US11262542B2 (en) 2014-12-30 2022-03-01 Largan Precision Co., Ltd. Photographing optical lens assembly, image capturing device and electronic device
US11867884B2 (en) 2014-12-30 2024-01-09 Largan Precision Co., Ltd. Photographing optical lens assembly, image capturing device and electronic device
US11262545B2 (en) 2019-07-19 2022-03-01 Largan Precision Co., Ltd. Imaging lens assembly, image capturing unit and electronic device

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