JPS56165106A - Automatic focusing device for zoom lens - Google Patents
Automatic focusing device for zoom lensInfo
- 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
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)
- Focusing (AREA)
- Lens Barrels (AREA)
- Automatic Focus Adjustment (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.
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)
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 |
-
1980
- 1980-05-23 JP JP6913380A patent/JPS56165106A/en active Pending
Cited By (3)
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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