GB1467664A - Zoom lenses - Google Patents

Zoom lenses

Info

Publication number
GB1467664A
GB1467664A GB997974A GB997974A GB1467664A GB 1467664 A GB1467664 A GB 1467664A GB 997974 A GB997974 A GB 997974A GB 997974 A GB997974 A GB 997974A GB 1467664 A GB1467664 A GB 1467664A
Authority
GB
United Kingdom
Prior art keywords
lens
group
movable
distance
zoom
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
GB997974A
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.)
Canon Inc
Original Assignee
Canon Inc
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 JP48026343A external-priority patent/JPS5215226B2/ja
Priority claimed from JP8704173A external-priority patent/JPS5624926B2/ja
Priority claimed from JP8814973A external-priority patent/JPS5629243B2/ja
Application filed by Canon Inc filed Critical Canon Inc
Publication of GB1467664A publication Critical patent/GB1467664A/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
    • G02B15/22—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 movable lens means specially adapted for focusing at close distances
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B7/00—Mountings, adjusting means, or light-tight connections, for optical elements
    • G02B7/28—Systems for automatic generation of focusing signals
    • G02B7/282—Autofocusing of zoom lenses
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B17/00—Details of cameras or camera bodies; Accessories therefor
    • G03B17/02—Bodies
    • G03B17/12—Bodies with means for supporting objectives, supplementary lenses, filters, masks, or turrets
    • G03B17/14—Bodies with means for supporting objectives, supplementary lenses, filters, masks, or turrets interchangeably

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Lens Barrels (AREA)
  • Automatic Focus Adjustment (AREA)

Abstract

1467664 Zoom lens CANON KK 6 March 1974 [6 March 1973 2 Aug 1973 6 Aug 1973] 9979/74 Heading G2J A zoom lens system including at least two movable lens groups 11, 12, Fig. 3, both movable, e.g. manually or by motor at P, Q, along the optical axis to effect magnification change and simultaneously compensate for image phase shift comprises a first detecting means 14 detecting the position of one group, a second detecting means 15 detecting the position of the other group, operation means controlled by the two detecting means, e.g. circuit 16, to determine the required position of the other group to maintain the image plane constant following magnification change effected by movement of the one group, and setting means, e.g. circuit 17 and motor 18 acting via rack and pinion 20, 19, to adjust the position of the other group. Figs. 2A-2C show a zoom lens having a fixed front and rear lens 5, 8, a fixed focal plane 9 and movable variator and imaging groups 6, 7. In Fig. 2A the zoom lens is set to its longest focal length and focused on infinity. In Fig. 2B lens 7 is moved a distance a to focus on object O distant R from lens 5. To zoom the lens from its telephoto setting for a required magnification, lens 6 is moved distance c and lens 7 distance (b-a) where b = function of (a, c). The speed and accuracy of focusing depend on the distance R, the focal length and the aperture, and each detector may be a rheostat rotated on adjusting a lens or an encoder plate Figs. 7, 8 (not shown) moved with a lens, with a plurality of brushes contacting differently spaced conductors on the plate to accommodate the accuracy for a given distance setting. In the embodiment of Fig. 10 the set value of aperture 212 is detected at 213 and fed to circuit 214 whereby the motor adjusts the lens positions accordingly. Imaging lens 7 and variator 6 may have their functions reversed or the lens 6, 7 may be fixed and the lens 5, 8 made movable, but this entails a larger diameter front lens 5. Imaging lens 7 may be formed by two movable groups Fig. 11 (not shown).
GB997974A 1973-03-06 1974-03-06 Zoom lenses Expired GB1467664A (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
JP48026343A JPS5215226B2 (en) 1973-03-06 1973-03-06
JP8704173A JPS5624926B2 (en) 1973-08-02 1973-08-02
JP8814973A JPS5629243B2 (en) 1973-08-06 1973-08-06

Publications (1)

Publication Number Publication Date
GB1467664A true GB1467664A (en) 1977-03-16

Family

ID=27285364

Family Applications (1)

Application Number Title Priority Date Filing Date
GB997974A Expired GB1467664A (en) 1973-03-06 1974-03-06 Zoom lenses

Country Status (3)

Country Link
DE (1) DE2410744C3 (en)
FR (1) FR2220800A1 (en)
GB (1) GB1467664A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9684149B2 (en) 2012-08-07 2017-06-20 Carl Zeiss Industrielle Messtechnik Gmbh Coordinate measuring machine and method for determining spatial coordinates on a measurement object

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2611639C3 (en) * 1976-03-19 1982-12-09 Jos. Schneider, Optische Werke, AG, 6550 Bad Kreuznach Control device for lenses with variable focal length
US4239354A (en) * 1979-01-02 1980-12-16 Polaroid Corporation Autofocus movie camera having improved focus response
DE2917176C3 (en) * 1979-04-27 1986-11-13 Optische Werke G. Rodenstock, 8000 München Reproduction lens for computer-controlled repro devices
DE2925906A1 (en) * 1979-06-27 1981-01-15 Rollei Werke Franke Heidecke OPTICAL IMAGING SYSTEM WITH VARIABLE FOCAL LENGTH, IN PARTICULAR ZOOM LENS FOR PHOTOGRAPHIC CAMERAS
JPS5729034A (en) * 1980-07-29 1982-02-16 Asahi Optical Co Ltd Control circuit of zoom device
FR2580412B1 (en) * 1985-04-10 1989-02-17 Angenieux P Ets VARIABLE FOCAL LENS DEVICE
EP0250686A1 (en) * 1986-06-26 1988-01-07 Etablissements Pierre Angenieux Objective system with a variable focal length
JP2505192B2 (en) * 1987-03-10 1996-06-05 オリンパス光学工業株式会社 Zoom mechanism
CA1331429C (en) * 1988-06-03 1994-08-16 Hiroshi Nomura Zoom lens barrel and camera incorporating such barrel
DE102014205272B4 (en) * 2014-03-20 2017-05-11 Deutsches Zentrum für Luft- und Raumfahrt e.V. Method and camera unit for detecting objects

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9684149B2 (en) 2012-08-07 2017-06-20 Carl Zeiss Industrielle Messtechnik Gmbh Coordinate measuring machine and method for determining spatial coordinates on a measurement object

Also Published As

Publication number Publication date
DE2410744A1 (en) 1974-09-12
DE2410744B2 (en) 1980-02-21
FR2220800A1 (en) 1974-10-04
DE2410744C3 (en) 1980-11-13

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Legal Events

Date Code Title Description
PS Patent sealed
PE20 Patent expired after termination of 20 years

Effective date: 19940305