FR2408846A1 - Objectif a focale variable - Google Patents

Objectif a focale variable

Info

Publication number
FR2408846A1
FR2408846A1 FR7832135A FR7832135A FR2408846A1 FR 2408846 A1 FR2408846 A1 FR 2408846A1 FR 7832135 A FR7832135 A FR 7832135A FR 7832135 A FR7832135 A FR 7832135A FR 2408846 A1 FR2408846 A1 FR 2408846A1
Authority
FR
France
Prior art keywords
variable focal
objective
focal objective
median element
elements
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
FR7832135A
Other languages
English (en)
French (fr)
Other versions
FR2408846B1 (enExample
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.)
Gretag AG
Original Assignee
Gretag AG
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 Gretag AG filed Critical Gretag AG
Publication of FR2408846A1 publication Critical patent/FR2408846A1/fr
Application granted granted Critical
Publication of FR2408846B1 publication Critical patent/FR2408846B1/fr
Granted 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
    • G02B15/14—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
    • 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
    • G02B15/143—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 three groups only
    • G02B15/1431—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 three groups only the first group being positive
    • G02B15/143105—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 three groups only the first group being positive arranged +-+

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Lenses (AREA)
  • Automatic Focus Adjustment (AREA)
  • Lens Barrels (AREA)
FR7832135A 1977-11-15 1978-11-14 Objectif a focale variable Granted FR2408846A1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CH1392277A CH621414A5 (enExample) 1977-11-15 1977-11-15

Publications (2)

Publication Number Publication Date
FR2408846A1 true FR2408846A1 (fr) 1979-06-08
FR2408846B1 FR2408846B1 (enExample) 1984-01-13

Family

ID=4396495

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7832135A Granted FR2408846A1 (fr) 1977-11-15 1978-11-14 Objectif a focale variable

Country Status (7)

Country Link
US (1) US4247168A (enExample)
JP (1) JPS5491223A (enExample)
CH (1) CH621414A5 (enExample)
DE (1) DE2849128A1 (enExample)
FR (1) FR2408846A1 (enExample)
GB (1) GB2008789B (enExample)
IT (1) IT1106040B (enExample)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS56159614A (en) * 1980-05-13 1981-12-09 Asahi Optical Co Ltd Copying variable magnification lens system
US4894682A (en) * 1986-09-30 1990-01-16 Canon Kabushiki Kaisha Variable magnification copying apparatus
US6657670B1 (en) * 1999-03-16 2003-12-02 Teco Image Systems Co., Ltd. Diaphragm structure of digital still camera
US9596900B2 (en) 2009-12-25 2017-03-21 Ykk Corporation Upper die for fastening button
US9777235B2 (en) 2016-04-04 2017-10-03 Allard Services Limited Fuel oil compositions and processes
BR112018068810A2 (pt) 2016-04-04 2019-01-22 Arq Ip Limited produto fracionado e processo para sua produção, processo para operar um destilador fracionário, produto de mistura líquida-sólida combinada e seu uso

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2159394A (en) * 1936-06-09 1939-05-23 Paramount Productions Inc Variable equivalent focal length lens
US2663223A (en) * 1950-07-18 1953-12-22 Watson W & Sons Ltd Variable magnification optical system
US3625595A (en) * 1970-01-26 1971-12-07 Bell & Howell Co Self-compensating symmetrical lens system
US3883228A (en) * 1973-07-09 1975-05-13 Minnesota Mining & Mfg Variable magnification zoom lens
US4009928A (en) * 1975-06-27 1977-03-01 Back Frank G Three element varifocal lens systems
GB1495062A (en) * 1974-06-13 1977-12-14 Bertele L Objectives having variable focal length

Family Cites Families (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1947669A (en) * 1931-09-28 1934-02-20 Bell & Howell Co Lens of variable equivalent focal length
GB398307A (en) 1932-06-16 1933-09-14 Arthur Warmisham Improvements in variable focus lenses
DE650907C (de) * 1934-08-28 1937-10-05 Hugh Iwan Gramatzki Optisches System
US3436145A (en) * 1964-09-17 1969-04-01 Ednalite Corp Focusing lens pair combined with photocopying objective
US3495895A (en) * 1966-09-01 1970-02-17 Rodenstock Optik G Apochromatic,symmetrical,wide-angle objective lens system
AT287341B (de) * 1969-08-14 1971-01-25 Eumig Pankratisches Projektionsobjektiv
JPS491242A (enExample) * 1972-04-17 1974-01-08
US3752565A (en) * 1972-02-18 1973-08-14 Shima Kogaku Kk Zoom lens apparatus
GB1386175A (en) * 1972-06-02 1975-03-05 Rank Organisation Ltd Lenses
JPS5852201B2 (ja) * 1974-04-04 1983-11-21 ミノルタ株式会社 変倍レンズ
DE2703914C2 (de) * 1976-03-03 1986-06-26 Xerox Corp., Rochester, N.Y. Vario-Objektiv zur Abbildung zwischen einem festen endlichen Objekt-/Bildebenenabstand
US4056308A (en) * 1976-03-03 1977-11-01 Xerox Corporation Variable focal length reflector lens system

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2159394A (en) * 1936-06-09 1939-05-23 Paramount Productions Inc Variable equivalent focal length lens
US2663223A (en) * 1950-07-18 1953-12-22 Watson W & Sons Ltd Variable magnification optical system
US3625595A (en) * 1970-01-26 1971-12-07 Bell & Howell Co Self-compensating symmetrical lens system
US3883228A (en) * 1973-07-09 1975-05-13 Minnesota Mining & Mfg Variable magnification zoom lens
GB1495062A (en) * 1974-06-13 1977-12-14 Bertele L Objectives having variable focal length
US4009928A (en) * 1975-06-27 1977-03-01 Back Frank G Three element varifocal lens systems

Also Published As

Publication number Publication date
US4247168A (en) 1981-01-27
FR2408846B1 (enExample) 1984-01-13
IT1106040B (it) 1985-11-11
DE2849128A1 (de) 1979-05-17
DE2849128C2 (enExample) 1989-11-23
CH621414A5 (enExample) 1981-01-30
JPS5491223A (en) 1979-07-19
IT7851471A0 (it) 1978-10-11
GB2008789A (en) 1979-06-06
GB2008789B (en) 1982-04-07

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Legal Events

Date Code Title Description
ST Notification of lapse