JPS5766411A - Focus detecting method - Google Patents

Focus detecting method

Info

Publication number
JPS5766411A
JPS5766411A JP14265380A JP14265380A JPS5766411A JP S5766411 A JPS5766411 A JP S5766411A JP 14265380 A JP14265380 A JP 14265380A JP 14265380 A JP14265380 A JP 14265380A JP S5766411 A JPS5766411 A JP S5766411A
Authority
JP
Japan
Prior art keywords
image
diffraction grating
grating
boundary line
spot light
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
JP14265380A
Other languages
Japanese (ja)
Inventor
Toshihiro Kondo
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.)
Nippon Seimitsu Kogyo KK
Original Assignee
Nippon Seimitsu Kogyo 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 Nippon Seimitsu Kogyo KK filed Critical Nippon Seimitsu Kogyo KK
Priority to JP14265380A priority Critical patent/JPS5766411A/en
Publication of JPS5766411A publication Critical patent/JPS5766411A/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
    • G02B7/30—Systems for automatic generation of focusing signals using parallactic triangle with a base line
    • G02B7/32—Systems for automatic generation of focusing signals using parallactic triangle with a base line using active means, e.g. light emitter

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Measurement Of Optical Distance (AREA)
  • Automatic Focus Adjustment (AREA)

Abstract

PURPOSE:To achieve focus detection with simple constitution by arranging adjacent photodetecting elements on the reverse surface of a diffraction grating so that their boundary line crosses the parallel direction of the grating, and then detecting the existence of a diffraction image. CONSTITUTION:Light from a spot light source 3 emitting light at constant cycles is passed through an anamorphic lens 4, a slit 5 and a lens 6 to strike a body, and an image of spot light is formed on a diffraction grating 7 through an objective lens 1. On the reverse surface of the diffraction grating 7, a photodetecting element 8 consisting of two photoelectric elements 8A and 8B whose boundary line cross the parallel direction of the grating of the diffraction grating is arranged in close contact. The image of the spot light is formed where its boundary is nearly coincident with the boundary line of the photoelectric elements 8A and 8B in an in-focus state. Therefore, the image is in focus when the maximum difference in output between the photoelectric elements 8A and 8B is obtained.
JP14265380A 1980-10-13 1980-10-13 Focus detecting method Pending JPS5766411A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP14265380A JPS5766411A (en) 1980-10-13 1980-10-13 Focus detecting method

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP14265380A JPS5766411A (en) 1980-10-13 1980-10-13 Focus detecting method

Publications (1)

Publication Number Publication Date
JPS5766411A true JPS5766411A (en) 1982-04-22

Family

ID=15320359

Family Applications (1)

Application Number Title Priority Date Filing Date
JP14265380A Pending JPS5766411A (en) 1980-10-13 1980-10-13 Focus detecting method

Country Status (1)

Country Link
JP (1) JPS5766411A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60156619U (en) * 1984-03-28 1985-10-18 株式会社高岳製作所 Mold butting for air switch
JPS61137116A (en) * 1984-12-07 1986-06-24 Canon Inc Focus detecting device
EP0343158A1 (en) * 1987-01-13 1989-11-29 Thomas Dewitt Range finding by diffraction.
JP2017075868A (en) * 2015-10-15 2017-04-20 アズビル株式会社 Photoelectric sensor

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60156619U (en) * 1984-03-28 1985-10-18 株式会社高岳製作所 Mold butting for air switch
JPS61137116A (en) * 1984-12-07 1986-06-24 Canon Inc Focus detecting device
EP0343158A1 (en) * 1987-01-13 1989-11-29 Thomas Dewitt Range finding by diffraction.
JP2017075868A (en) * 2015-10-15 2017-04-20 アズビル株式会社 Photoelectric sensor

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