JPS56156813A - Lens for copying - Google Patents

Lens for copying

Info

Publication number
JPS56156813A
JPS56156813A JP6054880A JP6054880A JPS56156813A JP S56156813 A JPS56156813 A JP S56156813A JP 6054880 A JP6054880 A JP 6054880A JP 6054880 A JP6054880 A JP 6054880A JP S56156813 A JPS56156813 A JP S56156813A
Authority
JP
Japan
Prior art keywords
lens
lenses
constitution
diaphragm face
faces
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
JP6054880A
Other languages
Japanese (ja)
Other versions
JPS6051092B2 (en
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 JP6054880A priority Critical patent/JPS6051092B2/en
Publication of JPS56156813A publication Critical patent/JPS56156813A/en
Publication of JPS6051092B2 publication Critical patent/JPS6051092B2/en
Expired 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 reduce the astigmatism range, by separting cemented lenses of the orthometer type lens and by specifying respective parameters. CONSTITUTION:Six-group six-lens constitution in aperture ratio 1:4.5 is given to the lens for copying, and this lens is symmetrical completely with diaphragm face r7 as the center. In this case, when radiuses of curvatures of lenses, the diaphragm face, intervals of faces of lenses, distances from lens faces to the diaphragm face, refractive indexes of respective lenses, Abbe numbers of respective lenses, the focal length of the lens, and half-image angle are denoted as r1, r2-r6 and r8-r13, r7, d1, d2-d5, d8, d9-d12, d6 and d7, n1 and n2-n6, v1 and v2- v6, (f), and omega, respec tively, constitution requirements are shown in expressions. Thus, flatness is kept up to most circumferential side omega=22.6 of frame aberration, and the overall length is shortened to 0.362f, and the lens is made compact.
JP6054880A 1980-05-09 1980-05-09 Copying lens Expired JPS6051092B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP6054880A JPS6051092B2 (en) 1980-05-09 1980-05-09 Copying lens

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP6054880A JPS6051092B2 (en) 1980-05-09 1980-05-09 Copying lens

Publications (2)

Publication Number Publication Date
JPS56156813A true JPS56156813A (en) 1981-12-03
JPS6051092B2 JPS6051092B2 (en) 1985-11-12

Family

ID=13145444

Family Applications (1)

Application Number Title Priority Date Filing Date
JP6054880A Expired JPS6051092B2 (en) 1980-05-09 1980-05-09 Copying lens

Country Status (1)

Country Link
JP (1) JPS6051092B2 (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63186207A (en) * 1987-01-29 1988-08-01 Ricoh Co Ltd Large-aperture lens for copying
JPH01279218A (en) * 1988-05-02 1989-11-09 Dainippon Screen Mfg Co Ltd Apochromat lens
EP0785077A3 (en) * 1996-01-22 1998-06-10 Fuji Xerox Co., Ltd. Image recording apparatus with an array light source

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63186207A (en) * 1987-01-29 1988-08-01 Ricoh Co Ltd Large-aperture lens for copying
JPH01279218A (en) * 1988-05-02 1989-11-09 Dainippon Screen Mfg Co Ltd Apochromat lens
EP0785077A3 (en) * 1996-01-22 1998-06-10 Fuji Xerox Co., Ltd. Image recording apparatus with an array light source

Also Published As

Publication number Publication date
JPS6051092B2 (en) 1985-11-12

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