GB1154785A - Lens System - Google Patents

Lens System

Info

Publication number
GB1154785A
GB1154785A GB45431/67A GB4543167A GB1154785A GB 1154785 A GB1154785 A GB 1154785A GB 45431/67 A GB45431/67 A GB 45431/67A GB 4543167 A GB4543167 A GB 4543167A GB 1154785 A GB1154785 A GB 1154785A
Authority
GB
United Kingdom
Prior art keywords
lens
coma
different
shape
bending
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.)
Expired
Application number
GB45431/67A
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.)
International Business Machines Corp
Original Assignee
International Business Machines Corp
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 International Business Machines Corp filed Critical International Business Machines Corp
Publication of GB1154785A publication Critical patent/GB1154785A/en
Expired 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
    • 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
    • G02B15/142—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 two groups only

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Exposure And Positioning Against Photoresist Photosensitive Materials (AREA)
  • Lenses (AREA)

Abstract

1,154,785. Optical objectives. INTERNATIONAL BUSINESS MACHINES CORP. Oct. 5, 1967 [Dec. 8, 1966], No.45431/67. Heading G2J. An objective for use at a plurality of different conjugate object and image distances for different magnification ratios, e.g. for micro-filming in which a reduction of 50X, 40X, 30X, 20X, 17X and 15X is required, comprises a group of lens elements I - VIII and means for changing the effective shape of one lens element V so that a substantial effect is produced only on the coma of the system to permit correction of coma for each of the different conjugate object and image distances. As shown, Fig. 28, the lens V is relatively thin and close to the diaphragm 12 so that its astigmatic contribution is mainly a function of the lens power and almost independent of its shape. Also the spherical aberration changes slowly as a function of bending whereas the coma contribution changes rapidly with bending. Therefore by having a series of lens elements V on a turret 14, each element being of a different shape but all being of similar power, the appropriate one may be introduced into the system for a given magnification, or reduction. To correct for astigmatism the distance S 2 between elements II and III is varied such as by a lead screw 18, the other air spaces remaining constant. Optical data are given for the example shown.
GB45431/67A 1966-12-08 1967-10-05 Lens System Expired GB1154785A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US60015866A 1966-12-08 1966-12-08

Publications (1)

Publication Number Publication Date
GB1154785A true GB1154785A (en) 1969-06-11

Family

ID=24402531

Family Applications (1)

Application Number Title Priority Date Filing Date
GB45431/67A Expired GB1154785A (en) 1966-12-08 1967-10-05 Lens System

Country Status (6)

Country Link
CH (1) CH469277A (en)
DE (1) DE1572700B1 (en)
FR (1) FR1542937A (en)
GB (1) GB1154785A (en)
NL (1) NL6716449A (en)
SE (1) SE320517B (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3036916A1 (en) * 1979-10-01 1981-04-09 Polaroid Corp., 02139 Cambridge, Mass. AUTOMATIC FOCUS ADJUSTMENT FOR PHOTOGRAPHIC APPARATUS
GB2339619A (en) * 1998-05-14 2000-02-02 Pilkington Perkin Elmer Ltd Dual field of view objective lens with switchable intermediate lens
US6160668A (en) * 1998-05-14 2000-12-12 Pilkington Pe Limited Optical systems

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4466707A (en) * 1980-03-21 1984-08-21 Canon Kabushiki Kaisha Variable magnification lens system

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR951536A (en) * 1944-06-30 1949-10-27 Kodak Pathe Improvements to photographic lenses
DE1087825B (en) * 1958-07-01 1960-08-25 Zeiss Carl Fa Photographic lens
FR1239950A (en) * 1959-05-30 1960-09-02 Meopta Prevov Narodni Podnik High-brightness photographic lens

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3036916A1 (en) * 1979-10-01 1981-04-09 Polaroid Corp., 02139 Cambridge, Mass. AUTOMATIC FOCUS ADJUSTMENT FOR PHOTOGRAPHIC APPARATUS
GB2339619A (en) * 1998-05-14 2000-02-02 Pilkington Perkin Elmer Ltd Dual field of view objective lens with switchable intermediate lens
US6160668A (en) * 1998-05-14 2000-12-12 Pilkington Pe Limited Optical systems
GB2339619B (en) * 1998-05-14 2002-05-01 Pilkington Perkin Elmer Ltd Optical systems

Also Published As

Publication number Publication date
DE1572700B1 (en) 1971-10-07
NL6716449A (en) 1968-06-10
CH469277A (en) 1969-02-28
FR1542937A (en)
SE320517B (en) 1970-02-09

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