CH611717A5 - Lens having a variable focal length - Google Patents

Lens having a variable focal length

Info

Publication number
CH611717A5
CH611717A5 CH201077A CH201077A CH611717A5 CH 611717 A5 CH611717 A5 CH 611717A5 CH 201077 A CH201077 A CH 201077A CH 201077 A CH201077 A CH 201077A CH 611717 A5 CH611717 A5 CH 611717A5
Authority
CH
Switzerland
Prior art keywords
lens
focal length
variable focal
variable
length
Prior art date
Application number
CH201077A
Inventor
George L Mccrobie
Edgar E Price
Louise L Spurles
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 CH611717A5 publication Critical patent/CH611717A5/en

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)
CH201077A 1976-03-03 1977-02-17 Lens having a variable focal length CH611717A5 (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
CH611717A5 true CH611717A5 (en) 1979-06-15

Family

ID=27098728

Family Applications (1)

Application Number Title Priority Date Filing Date
CH201077A CH611717A5 (en) 1976-03-03 1977-02-17 Lens having a variable focal length

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
GB1553054A (en) 1979-09-19
FR2343268A1 (en) 1977-09-30
NL7702191A (en) 1977-09-06
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
PL Patent ceased