JPS57111509A - Fine space positioning device of information retrieval device - Google Patents

Fine space positioning device of information retrieval device

Info

Publication number
JPS57111509A
JPS57111509A JP18530980A JP18530980A JPS57111509A JP S57111509 A JPS57111509 A JP S57111509A JP 18530980 A JP18530980 A JP 18530980A JP 18530980 A JP18530980 A JP 18530980A JP S57111509 A JPS57111509 A JP S57111509A
Authority
JP
Japan
Prior art keywords
laser light
plural
diffraction grating
light beam
detecting
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
JP18530980A
Other languages
Japanese (ja)
Other versions
JPS6041283B2 (en
Inventor
Eiichi Tsukada
Toranosuke Izawa
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 Telegraph and Telephone Corp
Original Assignee
Nippon Telegraph and Telephone Corp
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 Telegraph and Telephone Corp filed Critical Nippon Telegraph and Telephone Corp
Priority to JP18530980A priority Critical patent/JPS6041283B2/en
Publication of JPS57111509A publication Critical patent/JPS57111509A/en
Publication of JPS6041283B2 publication Critical patent/JPS6041283B2/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
    • G06K7/00—Methods or arrangements for sensing record carriers, e.g. for reading patterns
    • G06K7/10—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation
    • G06K7/10544—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation by scanning of the records by radiation in the optical part of the electromagnetic spectrum
    • G06K7/10821—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation by scanning of the records by radiation in the optical part of the electromagnetic spectrum further details of bar or optical code scanning devices
    • G06K7/10831—Arrangement of optical elements, e.g. lenses, mirrors, prisms

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Health & Medical Sciences (AREA)
  • General Health & Medical Sciences (AREA)
  • Toxicology (AREA)
  • Artificial Intelligence (AREA)
  • Computer Vision & Pattern Recognition (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Length Measuring Devices By Optical Means (AREA)
  • Optical Transform (AREA)

Abstract

PURPOSE:To execute positioning with high accuracy by a fine interval, by splitting a laser light beam into plural beams by use of a diffraction grating, and coupling them as plural optical spots whose phase has been shifted onto the grating stripes of a position detecting scale. CONSTITUTION:One laser light beam from a semiconductor laser is split into plural laser light beams by a diffraction grating, only a laser light beam having intense light quantity, which is used for detecting a position is made incident to a condensing lens, and this beam is focused as a spot on a position detecting scale 1. When the diffraction grating is rotated and adjusted, 3 condensing spots SP1, SP2 and SP3 which are slightly separated and are shifted in phase by a portion corresponding to a recording information space pitch (m) are obtained. A positioner is positioned by a periodical position signal waveform obtained by plural photodetectors for detecting said plural laser light beams.
JP18530980A 1980-12-29 1980-12-29 Fine interval positioning device in information retrieval equipment Expired JPS6041283B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP18530980A JPS6041283B2 (en) 1980-12-29 1980-12-29 Fine interval positioning device in information retrieval equipment

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP18530980A JPS6041283B2 (en) 1980-12-29 1980-12-29 Fine interval positioning device in information retrieval equipment

Publications (2)

Publication Number Publication Date
JPS57111509A true JPS57111509A (en) 1982-07-12
JPS6041283B2 JPS6041283B2 (en) 1985-09-14

Family

ID=16168593

Family Applications (1)

Application Number Title Priority Date Filing Date
JP18530980A Expired JPS6041283B2 (en) 1980-12-29 1980-12-29 Fine interval positioning device in information retrieval equipment

Country Status (1)

Country Link
JP (1) JPS6041283B2 (en)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59132311A (en) * 1983-01-18 1984-07-30 Sony Magnescale Inc Optical scale
JPS59159016A (en) * 1983-03-01 1984-09-08 Mansei Kogyo Kk Optical encoder
JPS60100013A (en) * 1983-11-05 1985-06-03 Fanuc Ltd Apparatus for detection of rotation
JPS6140511A (en) * 1984-07-31 1986-02-26 Derufuai:Kk Encoder
JPS6140510A (en) * 1984-07-31 1986-02-26 Derufuai:Kk Encoder
JPS6222019A (en) * 1985-07-19 1987-01-30 ドクトル・ヨハネス・ハイデンハイン・ゲゼルシヤフト・ミツト・ベシユレンクテル・ハフトウング Detector for fundamental position
JPH0284967U (en) * 1988-12-19 1990-07-03

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP6386337B2 (en) * 2014-10-23 2018-09-05 株式会社ミツトヨ Optical encoder

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59132311A (en) * 1983-01-18 1984-07-30 Sony Magnescale Inc Optical scale
JPS59159016A (en) * 1983-03-01 1984-09-08 Mansei Kogyo Kk Optical encoder
JPS60100013A (en) * 1983-11-05 1985-06-03 Fanuc Ltd Apparatus for detection of rotation
JPS6140511A (en) * 1984-07-31 1986-02-26 Derufuai:Kk Encoder
JPS6140510A (en) * 1984-07-31 1986-02-26 Derufuai:Kk Encoder
JPS6222019A (en) * 1985-07-19 1987-01-30 ドクトル・ヨハネス・ハイデンハイン・ゲゼルシヤフト・ミツト・ベシユレンクテル・ハフトウング Detector for fundamental position
JPH0464566B2 (en) * 1985-07-19 1992-10-15 Dokutoru Yohanesu Haidenhain Gmbh
JPH0284967U (en) * 1988-12-19 1990-07-03

Also Published As

Publication number Publication date
JPS6041283B2 (en) 1985-09-14

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