JPS56121007A - Zoom lens controller - Google Patents

Zoom lens controller

Info

Publication number
JPS56121007A
JPS56121007A JP2269680A JP2269680A JPS56121007A JP S56121007 A JPS56121007 A JP S56121007A JP 2269680 A JP2269680 A JP 2269680A JP 2269680 A JP2269680 A JP 2269680A JP S56121007 A JPS56121007 A JP S56121007A
Authority
JP
Japan
Prior art keywords
zoom lens
voltage
zoom ratio
zoom
outputted
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.)
Pending
Application number
JP2269680A
Other languages
Japanese (ja)
Inventor
Yasutaka Shibuya
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.)
Hitachi Denshi KK
Original Assignee
Hitachi Denshi KK
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 Hitachi Denshi KK filed Critical Hitachi Denshi KK
Priority to JP2269680A priority Critical patent/JPS56121007A/en
Publication of JPS56121007A publication Critical patent/JPS56121007A/en
Pending legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B7/00—Mountings, adjusting means, or light-tight connections, for optical elements
    • G02B7/02—Mountings, adjusting means, or light-tight connections, for optical elements for lenses
    • G02B7/04—Mountings, adjusting means, or light-tight connections, for optical elements for lenses with mechanism for focusing or varying magnification
    • G02B7/10—Mountings, adjusting means, or light-tight connections, for optical elements for lenses with mechanism for focusing or varying magnification by relative axial movement of several lenses, e.g. of varifocal objective lens

Landscapes

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

Abstract

PURPOSE:To obtain a miniature, inexpensive zoom lens of high magnification, by using an ordinary zoom lens and extender and by controlling them relatively. CONSTITUTION:When voltage v that corresponds to zoom ratio (l) to be set in comparator 1 and voltage vn that corresponding to maximum zoom ratio (n) of zoom lens 5 are inputted to the comparator while v >=vn, comparator 1 outputs extender input signal E. When this input signal E is on, extender 4 is held inserted, namely, magnification (m) is set. On the other hand, zoom ratio (l) is set to i/m (m<=n) by potentiometer 2 and voltage v /m is outputted. Selector 3, applied with v and v /m, is switched with input signal E; when E is off, v is outputted when on, v /m is outputted. With this voltage, the zoom ratio of zoom lens 5 is set to (l) or l/m. Consequently, the zoom ratio (l) is continuously variable from 1 to mXn times.
JP2269680A 1980-02-27 1980-02-27 Zoom lens controller Pending JPS56121007A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2269680A JPS56121007A (en) 1980-02-27 1980-02-27 Zoom lens controller

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2269680A JPS56121007A (en) 1980-02-27 1980-02-27 Zoom lens controller

Publications (1)

Publication Number Publication Date
JPS56121007A true JPS56121007A (en) 1981-09-22

Family

ID=12090028

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2269680A Pending JPS56121007A (en) 1980-02-27 1980-02-27 Zoom lens controller

Country Status (1)

Country Link
JP (1) JPS56121007A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58202431A (en) * 1982-05-19 1983-11-25 Fuji Photo Film Co Ltd Focusing device of lens system switching type camera
JPS59127008A (en) * 1983-01-11 1984-07-21 Fuji Photo Film Co Ltd Automatic focusing device of lens switching camera
FR2614702A1 (en) * 1987-04-29 1988-11-04 Angenieux P Ets VARIABLE FOCAL OBJECTIVE DEVICE AND ITS CONTROL METHOD

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58202431A (en) * 1982-05-19 1983-11-25 Fuji Photo Film Co Ltd Focusing device of lens system switching type camera
JPS59127008A (en) * 1983-01-11 1984-07-21 Fuji Photo Film Co Ltd Automatic focusing device of lens switching camera
FR2614702A1 (en) * 1987-04-29 1988-11-04 Angenieux P Ets VARIABLE FOCAL OBJECTIVE DEVICE AND ITS CONTROL METHOD
US4854685A (en) * 1987-04-29 1989-08-08 Etablissements Pierre Angenieux Variable-focus objective-lens device and a method for the control of said device

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