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JPS57119309A - Automatic focus control device - Google Patents

Automatic focus control device

Info

Publication number
JPS57119309A
JPS57119309A JP527581A JP527581A JPS57119309A JP S57119309 A JPS57119309 A JP S57119309A JP 527581 A JP527581 A JP 527581A JP 527581 A JP527581 A JP 527581A JP S57119309 A JPS57119309 A JP S57119309A
Authority
JP
Japan
Prior art keywords
optical
image
lens
focus control
automatic focus
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
JP527581A
Other languages
Japanese (ja)
Inventor
Hirokuni Nakatani
Toru Takamura
Yuji Matsuda
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.)
Panasonic Holdings Corp
Original Assignee
Matsushita Electric Industrial 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 Matsushita Electric Industrial Co Ltd filed Critical Matsushita Electric Industrial Co Ltd
Priority to JP527581A priority Critical patent/JPS57119309A/en
Publication of JPS57119309A publication Critical patent/JPS57119309A/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
    • G02B7/36—Systems for automatic generation of focusing signals using image sharpness techniques, e.g. image processing techniques for generating autofocus signals
    • G02B7/38—Systems for automatic generation of focusing signals using image sharpness techniques, e.g. image processing techniques for generating autofocus signals measured at different points on the optical axis, e.g. focussing on two or more planes and comparing image data

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Computer Vision & Pattern Recognition (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Automatic Focus Adjustment (AREA)

Abstract

PURPOSE:To always ensure the automatic focus control in a continuous way, by controlling the focal position of an objective lens by making use of a part of an optical image obtained through the objective lens. CONSTITUTION:A subject 1 is projected to an image pickup element 3 through a main lens 2. A part of the formed subject image is guided to an optical path different from the element 3 through an optical system comprising a half mirror 6, a lens 7 and a mirror 8. Then two focus detecting lenses 9 and 10 having the same focal distance are provided to obtain two optical images similar to the optical image of the element 3 on an image forming surface 11. In addition, two focus detecting image sensors 12 and 13 are disposed at the positions near the surface 11 having different lengths of optical paths in order to obtain the out- of-focus information on the surface 11 through output terminals 14 and 15. The lens 2 is shifted by making use of the outputs of the sensors 12 and 13. In such a way, the automatic focus control is always made possible in a continuous way.
JP527581A 1981-01-16 1981-01-16 Automatic focus control device Pending JPS57119309A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP527581A JPS57119309A (en) 1981-01-16 1981-01-16 Automatic focus control device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP527581A JPS57119309A (en) 1981-01-16 1981-01-16 Automatic focus control device

Publications (1)

Publication Number Publication Date
JPS57119309A true JPS57119309A (en) 1982-07-24

Family

ID=11606683

Family Applications (1)

Application Number Title Priority Date Filing Date
JP527581A Pending JPS57119309A (en) 1981-01-16 1981-01-16 Automatic focus control device

Country Status (1)

Country Link
JP (1) JPS57119309A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2378834A (en) * 2001-03-28 2003-02-19 Fuji Photo Optical Co Ltd Apparatus for detecting focusing status of a lens

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2378834A (en) * 2001-03-28 2003-02-19 Fuji Photo Optical Co Ltd Apparatus for detecting focusing status of a lens
GB2378834B (en) * 2001-03-28 2005-03-02 Fuji Photo Optical Co Ltd Apparatus for detecting focusing status of taking lens
US7030927B2 (en) 2001-03-28 2006-04-18 Fujinon Corporation Apparatus for detecting focusing status of taking lens

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