FR2373803A1 - Pancratic lens with variable magnification attachment - has basic lens having fixed focal length and two displaceable lens elements (OE 15.2.78) - Google Patents

Pancratic lens with variable magnification attachment - has basic lens having fixed focal length and two displaceable lens elements (OE 15.2.78)

Info

Publication number
FR2373803A1
FR2373803A1 FR7737163A FR7737163A FR2373803A1 FR 2373803 A1 FR2373803 A1 FR 2373803A1 FR 7737163 A FR7737163 A FR 7737163A FR 7737163 A FR7737163 A FR 7737163A FR 2373803 A1 FR2373803 A1 FR 2373803A1
Authority
FR
France
Prior art keywords
lens
displaceable
focal length
variable magnification
pancratic
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.)
Withdrawn
Application number
FR7737163A
Other languages
French (fr)
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Publication of FR2373803A1 publication Critical patent/FR2373803A1/en
Withdrawn legal-status Critical Current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
    • G02B15/16—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 with interdependent non-linearly related movements between one lens or lens group, and another lens or lens group
    • G02B15/177—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 with interdependent non-linearly related movements between one lens or lens group, and another lens or lens group having a negative front lens or group of lenses
    • 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
    • G02B15/144—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
    • G02B15/1445—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 negative
    • G02B15/144511—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 negative arranged -+-+

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Nonlinear Science (AREA)
  • Lenses (AREA)

Abstract

The front-lens attachment has a negative front element stationary relative to the image plane and two lens elements displaceable along the optical axis. The positive lens element adjacent the front element and the negative displaceable lens element cause the imaging scale to change when the focal length is adjusted. The focal length of the negative displaceable lens element and the focal length of the positive displaceable lens element fulfil conditions stipulated by a given formula. The positive lens element can consist of a positively refracting lens, a negatively refracting lens cemented to it and a positively refracting simple lens.
FR7737163A 1976-12-10 1977-12-09 Pancratic lens with variable magnification attachment - has basic lens having fixed focal length and two displaceable lens elements (OE 15.2.78) Withdrawn FR2373803A1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
AT917676A AT346102B (en) 1976-12-10 1976-12-10 PANRATIC LENS

Publications (1)

Publication Number Publication Date
FR2373803A1 true FR2373803A1 (en) 1978-07-07

Family

ID=3611841

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7737163A Withdrawn FR2373803A1 (en) 1976-12-10 1977-12-09 Pancratic lens with variable magnification attachment - has basic lens having fixed focal length and two displaceable lens elements (OE 15.2.78)

Country Status (4)

Country Link
JP (1) JPS5373150A (en)
AT (1) AT346102B (en)
DE (1) DE2754950A1 (en)
FR (1) FR2373803A1 (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2780309B2 (en) * 1989-02-28 1998-07-30 ミノルタ株式会社 Compact zoom lens system
JP2516522B2 (en) * 1992-04-21 1996-07-24 株式会社エルモ社 Wide zoom lens

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3924934A (en) * 1972-12-26 1975-12-09 David S Grey Compact seven element zoom lens with mechanical compensation

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3924934A (en) * 1972-12-26 1975-12-09 David S Grey Compact seven element zoom lens with mechanical compensation

Also Published As

Publication number Publication date
AT346102B (en) 1978-10-25
JPS5373150A (en) 1978-06-29
ATA917676A (en) 1978-02-15
DE2754950A1 (en) 1978-06-15

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Legal Events

Date Code Title Description
ST Notification of lapse