GB1553054A - Variable magnification lens - Google Patents

Variable magnification lens

Info

Publication number
GB1553054A
GB1553054A GB8787/77A GB878777A GB1553054A GB 1553054 A GB1553054 A GB 1553054A GB 8787/77 A GB8787/77 A GB 8787/77A GB 878777 A GB878777 A GB 878777A GB 1553054 A GB1553054 A GB 1553054A
Authority
GB
United Kingdom
Prior art keywords
lens
elements
focal length
variable magnification
magnification lens
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
GB8787/77A
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.)
Xerox Corp
Original Assignee
Xerox 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
Priority claimed from US05/663,394 external-priority patent/US4056308A/en
Priority claimed from US05/663,397 external-priority patent/US4061419A/en
Application filed by Xerox Corp filed Critical Xerox Corp
Publication of GB1553054A publication Critical patent/GB1553054A/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B17/00—Systems with reflecting surfaces, with or without refracting elements
    • G02B17/08—Catadioptric systems
    • G02B17/0896—Catadioptric systems with variable magnification or multiple imaging planes, including multispectral systems
    • 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
    • G02B15/1421—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 the first group being positive
    • 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
    • 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
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B17/00—Systems with reflecting surfaces, with or without refracting elements
    • G02B17/008—Systems specially adapted to form image relays or chained systems
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B17/00—Systems with reflecting surfaces, with or without refracting elements
    • G02B17/08—Catadioptric systems

Landscapes

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

Abstract

The lens is built up symmetrically from six elements, the outer elements (4, 14) being fixed and the inner elements (6, 8; 10, 12), which are connected in pairs, being displaceable symmetrically relative to one another along the optical axis (16) for the purpose of varying the focal length. The parameters of the elements are selected such that the image field remains virtually plane over the entire range of the focal length. The rear half of the lens can be replaced by a plane mirror, thus producing a mirror lens having the same properties as the said six-member lens. The two lenses are used, in particular, in the production of photocopiers. <IMAGE>
GB8787/77A 1976-03-03 1977-03-02 Variable magnification lens Expired GB1553054A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US05/663,394 US4056308A (en) 1976-03-03 1976-03-03 Variable focal length reflector lens system
US05/663,397 US4061419A (en) 1976-03-03 1976-03-03 Variable magnification lens system

Publications (1)

Publication Number Publication Date
GB1553054A true GB1553054A (en) 1979-09-19

Family

ID=27098728

Family Applications (1)

Application Number Title Priority Date Filing Date
GB8787/77A Expired GB1553054A (en) 1976-03-03 1977-03-02 Variable magnification lens

Country Status (5)

Country Link
CH (1) CH611717A5 (en)
DE (1) DE2703914C2 (en)
FR (1) FR2343268A1 (en)
GB (1) GB1553054A (en)
NL (1) NL7702191A (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH621414A5 (en) * 1977-11-15 1981-01-30 Gretag Ag

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3537774A (en) * 1969-04-02 1970-11-03 Eastman Kodak Co Photographic objective of the gauss type having two airspaced negative doublets
BE755985A (en) * 1969-09-10 1971-03-10 Xerox Corp SYMMETRICAL DAGOR TYPE REPRODUCTIVE LENS SYSTEM, SEPARATE
US3687522A (en) * 1971-02-01 1972-08-29 Ilex Optical Co Inc Variable magnification lens system for finite conjugate distances
US3659922A (en) * 1971-02-25 1972-05-02 Xerox Corp Symmetrical half-lens optical system
JPS5110091B2 (en) * 1972-06-20 1976-04-01
US3865471A (en) * 1974-01-02 1975-02-11 Xerox Corp Lens system for photoelectrophoretic copying machine

Also Published As

Publication number Publication date
FR2343268A1 (en) 1977-09-30
NL7702191A (en) 1977-09-06
CH611717A5 (en) 1979-06-15
FR2343268B1 (en) 1980-09-12
DE2703914A1 (en) 1977-09-08
DE2703914C2 (en) 1986-06-26

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Legal Events

Date Code Title Description
PS Patent sealed [section 19, patents act 1949]
746 Register noted 'licences of right' (sect. 46/1977)
PCNP Patent ceased through non-payment of renewal fee