FR1190618A - Objectif de distance foncale correspondante variable - Google Patents

Objectif de distance foncale correspondante variable

Info

Publication number
FR1190618A
FR1190618A FR1190618DA FR1190618A FR 1190618 A FR1190618 A FR 1190618A FR 1190618D A FR1190618D A FR 1190618DA FR 1190618 A FR1190618 A FR 1190618A
Authority
FR
France
Prior art keywords
focal distance
variable corresponding
corresponding focal
distance objective
objective
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
Other languages
English (en)
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.)
Bell and Howell Co
Original Assignee
Bell and Howell Co
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 Bell and Howell Co filed Critical Bell and Howell Co
Application granted granted Critical
Publication of FR1190618A publication Critical patent/FR1190618A/fr
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
    • G02B15/14—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
    • G02B15/144—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 four groups only
    • G02B15/1441—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 four groups only the first group being positive
    • G02B15/144113—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 four groups only the first group being positive arranged +-++

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Moving Of The Head For Recording And Reproducing By Optical Means (AREA)
  • Lenses (AREA)
FR1190618D 1957-09-20 1957-11-21 Objectif de distance foncale correspondante variable Expired FR1190618A (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US685200A US2959101A (en) 1957-09-20 1957-09-20 Optical objective of variable equivalent focal length

Publications (1)

Publication Number Publication Date
FR1190618A true FR1190618A (fr) 1959-10-14

Family

ID=24751153

Family Applications (1)

Application Number Title Priority Date Filing Date
FR1190618D Expired FR1190618A (fr) 1957-09-20 1957-11-21 Objectif de distance foncale correspondante variable

Country Status (3)

Country Link
US (1) US2959101A (fr)
FR (1) FR1190618A (fr)
GB (1) GB840520A (fr)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3090282A (en) * 1959-01-28 1963-05-21 Angenieux Pierre Mechanism for controlling the axial displacements of optical elements
US3185029A (en) * 1961-01-23 1965-05-25 Bausch & Lomb Linear zoom optical system
JPS5891421A (ja) * 1981-11-26 1983-05-31 Canon Inc リヤ−フオ−カス方式のズ−ムレンズ
KR100371773B1 (ko) * 1995-07-07 2003-04-10 펜탁스 가부시키가이샤 렌즈셔터타입줌렌즈카메라및이러한카메라를제어하는방법
TWI640811B (zh) 2017-06-16 2018-11-11 大立光電股份有限公司 攝像系統鏡片組、取像裝置及電子裝置
TWI656377B (zh) 2018-03-28 2019-04-11 大立光電股份有限公司 取像光學鏡頭、取像裝置及電子裝置

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2732763A (en) * 1956-01-31 Varifocal lens constructions and devices
GB440397A (en) * 1934-03-26 1935-12-30 Henri Chretien Improvements in optical systems
FR1123471A (fr) * 1955-01-19 1956-09-21 Applic Tech Et D Expl Cinemato Perfectionnements aux appareils d'optique à distance focale variable
FR1120271A (fr) * 1955-01-24 1956-07-03 Objectif à longueur focale variable

Also Published As

Publication number Publication date
GB840520A (en) 1960-07-06
US2959101A (en) 1960-11-08

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