JPS57108819A - Wide-angle copying lens - Google Patents

Wide-angle copying lens

Info

Publication number
JPS57108819A
JPS57108819A JP55184669A JP18466980A JPS57108819A JP S57108819 A JPS57108819 A JP S57108819A JP 55184669 A JP55184669 A JP 55184669A JP 18466980 A JP18466980 A JP 18466980A JP S57108819 A JPS57108819 A JP S57108819A
Authority
JP
Japan
Prior art keywords
lens
concave
meniscus lens
wide
convex
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
JP55184669A
Other languages
Japanese (ja)
Inventor
Koichi Shinohara
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.)
Ricoh Co Ltd
Original Assignee
Ricoh 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 Ricoh Co Ltd filed Critical Ricoh Co Ltd
Priority to JP55184669A priority Critical patent/JPS57108819A/en
Publication of JPS57108819A publication Critical patent/JPS57108819A/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 a large aperture, a compact size and a wide angle respectively, by giving the conditions to the parameter of a lens system of 4 groups and 6 lenses. CONSTITUTION:The lens system includes the 1st concave meniscus lens 1, a cemented lens of the 2nd concave meniscus lens 2 (focal distance f2) and the 3rd convex meniscus lens 3 (refractive index u3), a cemented lens of the 4th diaphragm convex meniscus lens 4 (u4) and the 5th concave meniscus lens 5 (f5), and the 6th concave meniscus lens 6 (f8) respectively. Then the conditions (1)- (5) are satisfied when the composite focal distance is set to (f). In such way, a wide-angle lens type of a combination of a concave-convex-concave lenses which is used for a photographing lens, etc. is used to obtain the best performance at about 1X magnification ratio.
JP55184669A 1980-12-25 1980-12-25 Wide-angle copying lens Pending JPS57108819A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP55184669A JPS57108819A (en) 1980-12-25 1980-12-25 Wide-angle copying lens

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP55184669A JPS57108819A (en) 1980-12-25 1980-12-25 Wide-angle copying lens

Publications (1)

Publication Number Publication Date
JPS57108819A true JPS57108819A (en) 1982-07-07

Family

ID=16157280

Family Applications (1)

Application Number Title Priority Date Filing Date
JP55184669A Pending JPS57108819A (en) 1980-12-25 1980-12-25 Wide-angle copying lens

Country Status (1)

Country Link
JP (1) JPS57108819A (en)

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