JPS6413108A - Focus detecting device for camera - Google Patents

Focus detecting device for camera

Info

Publication number
JPS6413108A
JPS6413108A JP16771687A JP16771687A JPS6413108A JP S6413108 A JPS6413108 A JP S6413108A JP 16771687 A JP16771687 A JP 16771687A JP 16771687 A JP16771687 A JP 16771687A JP S6413108 A JPS6413108 A JP S6413108A
Authority
JP
Japan
Prior art keywords
correlation
detects
photographing lens
focus
images
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
JP16771687A
Other languages
Japanese (ja)
Inventor
Yoshiaki Takahashi
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.)
Konica Minolta Inc
Original Assignee
Konica Minolta Inc
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 Konica Minolta Inc filed Critical Konica Minolta Inc
Priority to JP16771687A priority Critical patent/JPS6413108A/en
Priority to EP88306162A priority patent/EP0298725A3/en
Publication of JPS6413108A publication Critical patent/JPS6413108A/en
Priority to US07/456,620 priority patent/US4956660A/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
    • G02B7/34—Systems for automatic generation of focusing signals using different areas in a pupil plane

Landscapes

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

Abstract

PURPOSE:To precisely detect a focus even if the contrast of an object is low by providing a means detecting parts having high correlation degrees based on the maximum and minimum values of the change rate of comparison data. CONSTITUTION:The optical axis of a photographing lens is held with a picture signal forming means 20, which converts 1st and 2nd images formed of fluxes of the object passing by the 1st and 2nd parts of the photographing lens into picture signals. Next, a correlation detecting means 30 detects the correlation of the two images by means of the picture signals, and a defocus amount operating means 40 detects the focus position of the photographing lens based on the correlation. The correlation detecting means 30 obtains the maximum value of the change rate of the comparison data and its minimum value, and detects a part with the highest correation degree among the two images based on said two values. Thus, even if the contrast of the object is low, a focus is precisely detected.
JP16771687A 1987-07-07 1987-07-07 Focus detecting device for camera Pending JPS6413108A (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
JP16771687A JPS6413108A (en) 1987-07-07 1987-07-07 Focus detecting device for camera
EP88306162A EP0298725A3 (en) 1987-07-07 1988-07-06 Focus detecting apparatus for camera
US07/456,620 US4956660A (en) 1987-07-07 1989-12-28 Focus detecting apparatus for camera

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP16771687A JPS6413108A (en) 1987-07-07 1987-07-07 Focus detecting device for camera

Publications (1)

Publication Number Publication Date
JPS6413108A true JPS6413108A (en) 1989-01-18

Family

ID=15854870

Family Applications (1)

Application Number Title Priority Date Filing Date
JP16771687A Pending JPS6413108A (en) 1987-07-07 1987-07-07 Focus detecting device for camera

Country Status (1)

Country Link
JP (1) JPS6413108A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007052205A (en) * 2005-08-17 2007-03-01 Canon Inc Focus detector and its control method

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62205324A (en) * 1986-03-05 1987-09-09 Minolta Camera Co Ltd Automatic focus detector for camera
JPS62280708A (en) * 1986-05-29 1987-12-05 Olympus Optical Co Ltd Interpolating method for focus detecting device

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62205324A (en) * 1986-03-05 1987-09-09 Minolta Camera Co Ltd Automatic focus detector for camera
JPS62280708A (en) * 1986-05-29 1987-12-05 Olympus Optical Co Ltd Interpolating method for focus detecting device

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007052205A (en) * 2005-08-17 2007-03-01 Canon Inc Focus detector and its control method

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