JPS56102815A - Automatic focusing device - Google Patents

Automatic focusing device

Info

Publication number
JPS56102815A
JPS56102815A JP430180A JP430180A JPS56102815A JP S56102815 A JPS56102815 A JP S56102815A JP 430180 A JP430180 A JP 430180A JP 430180 A JP430180 A JP 430180A JP S56102815 A JPS56102815 A JP S56102815A
Authority
JP
Japan
Prior art keywords
lens
photosensors
incident
focal length
half mirror
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
JP430180A
Other languages
Japanese (ja)
Inventor
Kenji Kimura
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.)
Olympus Corp
Original Assignee
Olympus Optical 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 Olympus Optical Co Ltd filed Critical Olympus Optical Co Ltd
Priority to JP430180A priority Critical patent/JPS56102815A/en
Publication of JPS56102815A publication Critical patent/JPS56102815A/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

Landscapes

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

Abstract

PURPOSE:To improve the precision of focus detection, by obtaining focal length information on a basis of the difference of the output between photodetectors which are arranged at an equal interval before and after the position of the optimum focal length of the lens. CONSTITUTION:The optical image incident through lens 10 is focused onto film 14 through half mirror 12, and the incident light reflected by half mirror 12 is incident to photosensors 16 and 18. Photosensors 16 and 18 are photoelectric conversion elements constituted by, for example, charge coupled devices. In respect to these charge coupled devices, the detection precision is improved according as the number of stages becomes larger. Outputs of photosensors 16 and 18 are supplied to operating circuit 20. Lens assembly 22 which fluctuates the position of the lens to perform focusing is connected to lens 10, and lens assembly 22 is rotated by DC reversible motor 28 through gears 24 and 26. This rotation of motor 28 is controlled according to the output of operating circuit 20.
JP430180A 1980-01-18 1980-01-18 Automatic focusing device Pending JPS56102815A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP430180A JPS56102815A (en) 1980-01-18 1980-01-18 Automatic focusing device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP430180A JPS56102815A (en) 1980-01-18 1980-01-18 Automatic focusing device

Publications (1)

Publication Number Publication Date
JPS56102815A true JPS56102815A (en) 1981-08-17

Family

ID=11580683

Family Applications (1)

Application Number Title Priority Date Filing Date
JP430180A Pending JPS56102815A (en) 1980-01-18 1980-01-18 Automatic focusing device

Country Status (1)

Country Link
JP (1) JPS56102815A (en)

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