JPS55103512A - Focusing point detecting method of optical device - Google Patents

Focusing point detecting method of optical device

Info

Publication number
JPS55103512A
JPS55103512A JP1081479A JP1081479A JPS55103512A JP S55103512 A JPS55103512 A JP S55103512A JP 1081479 A JP1081479 A JP 1081479A JP 1081479 A JP1081479 A JP 1081479A JP S55103512 A JPS55103512 A JP S55103512A
Authority
JP
Japan
Prior art keywords
optical device
imaging lens
moire image
overlapped
focusing
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
JP1081479A
Other languages
Japanese (ja)
Inventor
Nozomi Kitagishi
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.)
Canon Inc
Original Assignee
Canon 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 Canon Inc filed Critical Canon Inc
Priority to JP1081479A priority Critical patent/JPS55103512A/en
Publication of JPS55103512A publication Critical patent/JPS55103512A/en
Pending legal-status Critical Current

Links

Landscapes

  • Focusing (AREA)
  • Automatic Focus Adjustment (AREA)

Abstract

PURPOSE: To detect focusing of an optical device promptly and accurately from the appearing moire image interference fringe, by placing first and second charts having regular pattern on the imaging lens focal plane and subject position.
CONSTITUTION: A first chart 6 and a second chart 7 are placed on a focal plane 4 of an imaging lens 2 and a subject position 5. The respective charts are provided with regular patterns 61, 71, which should cause moire interference phenomenon when they are overlapped. A moire image 9 of good contrast appears when the two regular patterns to be overlapped are formed in the same pitch. There fore, since the moire image 9 appears only when correctly focused, the range finding precision similar to the required precision of the imaging lens may be obtained, so that the focusing of the optical device may be detected promptly and accurately.
COPYRIGHT: (C)1980,JPO&Japio
JP1081479A 1979-02-01 1979-02-01 Focusing point detecting method of optical device Pending JPS55103512A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP1081479A JPS55103512A (en) 1979-02-01 1979-02-01 Focusing point detecting method of optical device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP1081479A JPS55103512A (en) 1979-02-01 1979-02-01 Focusing point detecting method of optical device

Publications (1)

Publication Number Publication Date
JPS55103512A true JPS55103512A (en) 1980-08-07

Family

ID=11760808

Family Applications (1)

Application Number Title Priority Date Filing Date
JP1081479A Pending JPS55103512A (en) 1979-02-01 1979-02-01 Focusing point detecting method of optical device

Country Status (1)

Country Link
JP (1) JPS55103512A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60207113A (en) * 1984-03-30 1985-10-18 Dainippon Screen Mfg Co Ltd Method and device for moire prevention of image scanning recorder

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60207113A (en) * 1984-03-30 1985-10-18 Dainippon Screen Mfg Co Ltd Method and device for moire prevention of image scanning recorder

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