JPS57189106A - Focus detector - Google Patents

Focus detector

Info

Publication number
JPS57189106A
JPS57189106A JP7438881A JP7438881A JPS57189106A JP S57189106 A JPS57189106 A JP S57189106A JP 7438881 A JP7438881 A JP 7438881A JP 7438881 A JP7438881 A JP 7438881A JP S57189106 A JPS57189106 A JP S57189106A
Authority
JP
Japan
Prior art keywords
lens
image
forming
curved image
correcting
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
JP7438881A
Other languages
Japanese (ja)
Inventor
Takeshi Utagawa
Toru Fukuhara
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.)
Nikon Corp
Original Assignee
Nikon Corp
Nippon Kogaku KK
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 Nikon Corp, Nippon Kogaku KK filed Critical Nikon Corp
Priority to JP7438881A priority Critical patent/JPS57189106A/en
Publication of JPS57189106A publication Critical patent/JPS57189106A/en
Pending legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
    • G02B27/40—Optical focusing aids

Landscapes

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

Abstract

PURPOSE:To remarkably increase the accuracy of focusing detection, by providing an optical member correcting the curved image of an image-forming optical system for focus detection near a photodetecting plane. CONSTITUTION:As optical members 8s and 8t correcting curved image of a reimage-forming lens, a convex lens or a convex cylindrical lens is used. An optical member for the correction of curved image is located near detecting planes 8e and 8f. Thus, by correctly forming the image with the lens on the surfaces 8e and 8f, even if a fixed aperture is used for the lens, and also even if the aperture is stopped for the lens, since the distribution of illumination can be uniformed, the focus detecting error can be eliminated.
JP7438881A 1981-05-18 1981-05-18 Focus detector Pending JPS57189106A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP7438881A JPS57189106A (en) 1981-05-18 1981-05-18 Focus detector

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP7438881A JPS57189106A (en) 1981-05-18 1981-05-18 Focus detector

Publications (1)

Publication Number Publication Date
JPS57189106A true JPS57189106A (en) 1982-11-20

Family

ID=13545740

Family Applications (1)

Application Number Title Priority Date Filing Date
JP7438881A Pending JPS57189106A (en) 1981-05-18 1981-05-18 Focus detector

Country Status (1)

Country Link
JP (1) JPS57189106A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6153615A (en) * 1984-08-24 1986-03-17 Canon Inc Focus detecting device

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6153615A (en) * 1984-08-24 1986-03-17 Canon Inc Focus detecting device

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