JPS57158819A - Method for focusing detection - Google Patents

Method for focusing detection

Info

Publication number
JPS57158819A
JPS57158819A JP4418281A JP4418281A JPS57158819A JP S57158819 A JPS57158819 A JP S57158819A JP 4418281 A JP4418281 A JP 4418281A JP 4418281 A JP4418281 A JP 4418281A JP S57158819 A JPS57158819 A JP S57158819A
Authority
JP
Japan
Prior art keywords
appreciation
fundamental
circuit
appreciation method
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.)
Granted
Application number
JP4418281A
Other languages
Japanese (ja)
Other versions
JPH0377487B2 (en
Inventor
Asao Hayashi
Kenichi Oikami
Masahiro Aoki
Masatoshi Ida
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 Corp
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 Corp, Olympus Optical Co Ltd filed Critical Olympus Corp
Priority to JP4418281A priority Critical patent/JPS57158819A/en
Publication of JPS57158819A publication Critical patent/JPS57158819A/en
Publication of JPH0377487B2 publication Critical patent/JPH0377487B2/ja
Granted 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)
  • Automatic Focus Adjustment (AREA)

Abstract

PURPOSE:To extend the range of possibility of focus detection, by using a different appreciation method to discriminate the focus when the appreciation function based on a based on a fundamental appreciation method is lower than a prescribed level. CONSTITUTION:An object 1 is projected as an optical image onto a photodetector array 3 by a focusing lens 2, and respective outputs of photodetectors are subjected to A/D conversion in parallel in a circuit 4 to operate a fundamental appreciation function in a central processing device 5. When the operation result is lower than a prescribed threshold, a memory selecting circuit 30 is controlled by the device 5, and the selective read mode of a digital memory in the A/D converting circuit 4 is changed to switch the appreciation method to a different appreciation method. The lens 2 is moved by an optical system driving device 8, and the focusing state is displayed on a display device 7.
JP4418281A 1981-03-27 1981-03-27 Method for focusing detection Granted JPS57158819A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP4418281A JPS57158819A (en) 1981-03-27 1981-03-27 Method for focusing detection

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP4418281A JPS57158819A (en) 1981-03-27 1981-03-27 Method for focusing detection

Publications (2)

Publication Number Publication Date
JPS57158819A true JPS57158819A (en) 1982-09-30
JPH0377487B2 JPH0377487B2 (en) 1991-12-10

Family

ID=12684426

Family Applications (1)

Application Number Title Priority Date Filing Date
JP4418281A Granted JPS57158819A (en) 1981-03-27 1981-03-27 Method for focusing detection

Country Status (1)

Country Link
JP (1) JPS57158819A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59177509A (en) * 1983-03-29 1984-10-08 Kyocera Corp Automatic focus control device at moving limit on infinite side of lens
JP2007219029A (en) * 2006-02-15 2007-08-30 Sharp Corp Automatic focusing device

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5557809A (en) * 1978-10-24 1980-04-30 Olympus Optical Co Ltd Focusing detection system
JPS5587114A (en) * 1978-12-25 1980-07-01 Agency Of Ind Science & Technol Focus position detector
JPS5589819A (en) * 1978-12-28 1980-07-07 Asahi Optical Co Ltd Focus detector of camera

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5557809A (en) * 1978-10-24 1980-04-30 Olympus Optical Co Ltd Focusing detection system
JPS5587114A (en) * 1978-12-25 1980-07-01 Agency Of Ind Science & Technol Focus position detector
JPS5589819A (en) * 1978-12-28 1980-07-07 Asahi Optical Co Ltd Focus detector of camera

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59177509A (en) * 1983-03-29 1984-10-08 Kyocera Corp Automatic focus control device at moving limit on infinite side of lens
JPH0380289B2 (en) * 1983-03-29 1991-12-24 Kyocera Corp
JP2007219029A (en) * 2006-02-15 2007-08-30 Sharp Corp Automatic focusing device

Also Published As

Publication number Publication date
JPH0377487B2 (en) 1991-12-10

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