JPS57203905A - Optical position detector - Google Patents

Optical position detector

Info

Publication number
JPS57203905A
JPS57203905A JP56089007A JP8900781A JPS57203905A JP S57203905 A JPS57203905 A JP S57203905A JP 56089007 A JP56089007 A JP 56089007A JP 8900781 A JP8900781 A JP 8900781A JP S57203905 A JPS57203905 A JP S57203905A
Authority
JP
Japan
Prior art keywords
hologram
laser beam
position detector
disc
diffracted
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
JP56089007A
Other languages
Japanese (ja)
Inventor
Tadao Oiwa
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.)
NEC Corp
Original Assignee
NEC Corp
Nippon Electric Co Ltd
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 NEC Corp, Nippon Electric Co Ltd filed Critical NEC Corp
Priority to JP56089007A priority Critical patent/JPS57203905A/en
Publication of JPS57203905A publication Critical patent/JPS57203905A/en
Pending legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
    • G01D5/00—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable
    • G01D5/26—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light
    • G01D5/32—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light
    • G01D5/34—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light the beams of light being detected by photocells
    • G01D5/347—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light the beams of light being detected by photocells using displacement encoding scales
    • G01D5/34776—Absolute encoders with analogue or digital scales
    • G01D5/34792—Absolute encoders with analogue or digital scales with only digital scales or both digital and incremental scales

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Length Measuring Devices By Optical Means (AREA)
  • Transmission And Conversion Of Sensor Element Output (AREA)
  • Optical Transform (AREA)

Abstract

PURPOSE:To measure an absolute rotational angle with high accuracy by irradiating a laser beam to a hologram cell in which absolute address is coded and recorded. CONSTITUTION:A hologram disc 10 is attached to a rotating body of a hologram cell 14 on the disc 10 from a laser beam source 9, and the laser beam is diffracted on the face of the hologram. The diffracted beam is detected by a plurality of light detectors 11 and led to a detection circuit. The circuit 12 codifies and outputs the absolue rotational position.
JP56089007A 1981-06-10 1981-06-10 Optical position detector Pending JPS57203905A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP56089007A JPS57203905A (en) 1981-06-10 1981-06-10 Optical position detector

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP56089007A JPS57203905A (en) 1981-06-10 1981-06-10 Optical position detector

Publications (1)

Publication Number Publication Date
JPS57203905A true JPS57203905A (en) 1982-12-14

Family

ID=13958788

Family Applications (1)

Application Number Title Priority Date Filing Date
JP56089007A Pending JPS57203905A (en) 1981-06-10 1981-06-10 Optical position detector

Country Status (1)

Country Link
JP (1) JPS57203905A (en)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01263522A (en) * 1988-04-14 1989-10-20 Nikon Corp Optical type absolute encoder
WO2006064801A1 (en) * 2004-12-13 2006-06-22 Nikon Corporation Photoelectric encoder
EP1862775A1 (en) * 2006-05-31 2007-12-05 Delphi Technologies, Inc. High resolution position encoder
EP1862773A1 (en) * 2006-05-31 2007-12-05 Delphi Technologies, Inc. Contactless switch
EP1862771A1 (en) * 2006-05-31 2007-12-05 Delphi Technologies, Inc. Optical angular enoder with detection of eccentricity
US7332709B2 (en) 2004-12-13 2008-02-19 Nikon Corporation Photoelectric encoder
DE102005058808B4 (en) * 2005-12-09 2019-02-21 Dr. Johannes Heidenhain Gmbh Position measuring device with holographic scale

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01263522A (en) * 1988-04-14 1989-10-20 Nikon Corp Optical type absolute encoder
WO2006064801A1 (en) * 2004-12-13 2006-06-22 Nikon Corporation Photoelectric encoder
JP2006343314A (en) * 2004-12-13 2006-12-21 Sendai Nikon:Kk Photoelectric encoder
US7332709B2 (en) 2004-12-13 2008-02-19 Nikon Corporation Photoelectric encoder
DE102005058808B4 (en) * 2005-12-09 2019-02-21 Dr. Johannes Heidenhain Gmbh Position measuring device with holographic scale
EP1862775A1 (en) * 2006-05-31 2007-12-05 Delphi Technologies, Inc. High resolution position encoder
EP1862773A1 (en) * 2006-05-31 2007-12-05 Delphi Technologies, Inc. Contactless switch
EP1862771A1 (en) * 2006-05-31 2007-12-05 Delphi Technologies, Inc. Optical angular enoder with detection of eccentricity

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