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GB1323221A - Objectives of variable focal length - Google Patents

Objectives of variable focal length

Info

Publication number
GB1323221A
GB1323221A GB826771A GB1323221DA GB1323221A GB 1323221 A GB1323221 A GB 1323221A GB 826771 A GB826771 A GB 826771A GB 1323221D A GB1323221D A GB 1323221DA GB 1323221 A GB1323221 A GB 1323221A
Authority
GB
United Kingdom
Prior art keywords
focal length
objectives
variable focal
zooming
divergent
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
GB826771A
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.)
Rank Organization Ltd
Original Assignee
Rank Organization Ltd
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 Rank Organization Ltd filed Critical Rank Organization Ltd
Publication of GB1323221A publication Critical patent/GB1323221A/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
    • G02B15/14—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
    • G02B15/145—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 five groups only
    • G02B15/1455—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 five groups only the first group being negative

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Lenses (AREA)
  • Lens Barrels (AREA)

Abstract

1323221 Zoom lens RANK ORGANISATION Ltd 22 March 1972 [31 March 1971] 8267/71 Heading G2J A zoom lens having a stationary rear assembly and a front assembly comprising four members the first being divergent and stationary with respect to zooming the second and fourth both convergent move forward simultaneously for zooming to the maximum focal length and the third moving backwardly and being divergent. The front assembly satisfies the relationships
GB826771A 1971-03-31 1971-03-31 Objectives of variable focal length Expired GB1323221A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB826771 1971-03-31

Publications (1)

Publication Number Publication Date
GB1323221A true GB1323221A (en) 1973-07-11

Family

ID=9849218

Family Applications (1)

Application Number Title Priority Date Filing Date
GB826771A Expired GB1323221A (en) 1971-03-31 1971-03-31 Objectives of variable focal length

Country Status (6)

Country Link
DD (1) DD99858A5 (en)
DE (1) DE2212535A1 (en)
FR (1) FR2132334A6 (en)
GB (1) GB1323221A (en)
IT (1) IT1045153B (en)
NL (1) NL7204399A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5264965A (en) * 1991-02-15 1993-11-23 Asahi Kogaku Kogyo Kabushiki Kaisha Zoom lens
US9036266B2 (en) 2011-10-20 2015-05-19 Fujifilm Corporation Zoom lens for projection and projection-type display apparatus

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5264965A (en) * 1991-02-15 1993-11-23 Asahi Kogaku Kogyo Kabushiki Kaisha Zoom lens
US9036266B2 (en) 2011-10-20 2015-05-19 Fujifilm Corporation Zoom lens for projection and projection-type display apparatus

Also Published As

Publication number Publication date
IT1045153B (en) 1980-05-10
FR2132334A6 (en) 1972-11-17
DE2212535A1 (en) 1972-10-12
DD99858A5 (en) 1973-08-20
NL7204399A (en) 1972-10-03

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Legal Events

Date Code Title Description
PS Patent sealed
PCNP Patent ceased through non-payment of renewal fee