JPH0462004B2 - - Google Patents

Info

Publication number
JPH0462004B2
JPH0462004B2 JP18915684A JP18915684A JPH0462004B2 JP H0462004 B2 JPH0462004 B2 JP H0462004B2 JP 18915684 A JP18915684 A JP 18915684A JP 18915684 A JP18915684 A JP 18915684A JP H0462004 B2 JPH0462004 B2 JP H0462004B2
Authority
JP
Japan
Prior art keywords
light
radiation grating
radiation
grating
rotation
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.)
Expired
Application number
JP18915684A
Other languages
English (en)
Japanese (ja)
Other versions
JPS6166927A (ja
Inventor
Tetsuji Nishimura
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 JP18915684A priority Critical patent/JPS6166927A/ja
Publication of JPS6166927A publication Critical patent/JPS6166927A/ja
Priority to US07/481,684 priority patent/US4967072A/en
Publication of JPH0462004B2 publication Critical patent/JPH0462004B2/ja
Granted legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
    • G01P3/00—Measuring linear or angular speed; Measuring differences of linear or angular speeds
    • G01P3/36—Devices characterised by the use of optical means, e.g. using infrared, visible, or ultraviolet light
    • G01P3/366—Devices characterised by the use of optical means, e.g. using infrared, visible, or ultraviolet light by using diffraction of light
    • 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
    • G01D5/36—Forming the light into pulses
    • G01D5/38—Forming the light into pulses by diffraction gratings
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
    • G01P13/00—Indicating or recording presence, absence, or direction, of movement
    • G01P13/02—Indicating direction only, e.g. by weather vane
    • G01P13/04—Indicating positive or negative direction of a linear movement or clockwise or anti-clockwise direction of a rotational movement
    • G01P13/045—Indicating positive or negative direction of a linear movement or clockwise or anti-clockwise direction of a rotational movement with speed indication

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Electromagnetism (AREA)
  • Power Engineering (AREA)
  • Optical Transform (AREA)
JP18915684A 1984-09-05 1984-09-10 ロ−タリ−エンコ−ダ− Granted JPS6166927A (ja)

Priority Applications (2)

Application Number Priority Date Filing Date Title
JP18915684A JPS6166927A (ja) 1984-09-10 1984-09-10 ロ−タリ−エンコ−ダ−
US07/481,684 US4967072A (en) 1984-09-05 1990-02-20 Interferometric rotating condition detection apparatus

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP18915684A JPS6166927A (ja) 1984-09-10 1984-09-10 ロ−タリ−エンコ−ダ−

Publications (2)

Publication Number Publication Date
JPS6166927A JPS6166927A (ja) 1986-04-05
JPH0462004B2 true JPH0462004B2 (en]) 1992-10-02

Family

ID=16236377

Family Applications (1)

Application Number Title Priority Date Filing Date
JP18915684A Granted JPS6166927A (ja) 1984-09-05 1984-09-10 ロ−タリ−エンコ−ダ−

Country Status (1)

Country Link
JP (1) JPS6166927A (en])

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63247616A (ja) * 1987-04-03 1988-10-14 Canon Inc エンコ−ダ−
JP2774568B2 (ja) * 1989-05-12 1998-07-09 キヤノン株式会社 ロータリーエンコーダー
TW256914B (en) * 1994-05-27 1995-09-11 Ibm Servo-writing system for use in a data recording disk drive
US5442172A (en) * 1994-05-27 1995-08-15 International Business Machines Corporation Wavefront reconstruction optics for use in a disk drive position measurement system
JPH11211862A (ja) * 1997-11-19 1999-08-06 Seiko Epson Corp 情報処理装置

Also Published As

Publication number Publication date
JPS6166927A (ja) 1986-04-05

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