JPS56165106A - Automatic focusing device for zoom lens - Google Patents

Automatic focusing device for zoom lens

Info

Publication number
JPS56165106A
JPS56165106A JP6913380A JP6913380A JPS56165106A JP S56165106 A JPS56165106 A JP S56165106A JP 6913380 A JP6913380 A JP 6913380A JP 6913380 A JP6913380 A JP 6913380A JP S56165106 A JPS56165106 A JP S56165106A
Authority
JP
Japan
Prior art keywords
focusing
group
refractive power
lens group
lens
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
JP6913380A
Other languages
Japanese (ja)
Inventor
Mitsuo Yasukuni
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.)
Minolta Co Ltd
Original Assignee
Minolta Co 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 Minolta Co Ltd filed Critical Minolta Co Ltd
Priority to JP6913380A priority Critical patent/JPS56165106A/en
Publication of JPS56165106A publication Critical patent/JPS56165106A/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
    • G02B7/28—Systems for automatic generation of focusing signals
    • G02B7/282—Autofocusing of zoom lenses

Landscapes

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

Abstract

PURPOSE:To keep distances for adjusting focussing distance approximately constant by driving different lenses among a group of focusing lenses in accordance with focal lengths in a four component mechanically correcting type zoom lens where the fourth group is able to move for focusing. CONSTITUTION:In this zoom lens system, behind a lens group movable for zooming, a group of lenses for focusing is arranged, and a focusing lens group is constituted by a lens group 4a having a large refractive power and a group 4b having a small refractive power, and in the wide side, the lens group 4b with a small refractive power focusing and in the tele side the lens group 4b with a large refractive power being moved to focus. Focal distance information is taken out from the lens barrel to produce a signal on a terminal (a) in the case of the wide side or on a terminal (b) in the case of the tele side by a switching circuit and the body tube of 4a or 4b being controlled by a pulse produced by a circuit 13 to detect whether focusing points are matched and a pulse generating circuit 9 or 10.
JP6913380A 1980-05-23 1980-05-23 Automatic focusing device for zoom lens Pending JPS56165106A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP6913380A JPS56165106A (en) 1980-05-23 1980-05-23 Automatic focusing device for zoom lens

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP6913380A JPS56165106A (en) 1980-05-23 1980-05-23 Automatic focusing device for zoom lens

Publications (1)

Publication Number Publication Date
JPS56165106A true JPS56165106A (en) 1981-12-18

Family

ID=13393837

Family Applications (1)

Application Number Title Priority Date Filing Date
JP6913380A Pending JPS56165106A (en) 1980-05-23 1980-05-23 Automatic focusing device for zoom lens

Country Status (1)

Country Link
JP (1) JPS56165106A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60113219A (en) * 1983-11-04 1985-06-19 アグフア‐ゲヴエルト・アクチエンゲゼルシヤフト Photocopying equipment
US5267085A (en) * 1991-01-18 1993-11-30 Ricoh Company, Ltd. Zoom lens apparatus of two-lens group structure
JPH06140115A (en) * 1992-09-26 1994-05-20 Yamaichi Electron Co Ltd Ic socket

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60113219A (en) * 1983-11-04 1985-06-19 アグフア‐ゲヴエルト・アクチエンゲゼルシヤフト Photocopying equipment
US5267085A (en) * 1991-01-18 1993-11-30 Ricoh Company, Ltd. Zoom lens apparatus of two-lens group structure
JPH06140115A (en) * 1992-09-26 1994-05-20 Yamaichi Electron Co Ltd Ic socket

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