JPS57211503A - Measuring method for displacement of disc - Google Patents

Measuring method for displacement of disc

Info

Publication number
JPS57211503A
JPS57211503A JP9672481A JP9672481A JPS57211503A JP S57211503 A JPS57211503 A JP S57211503A JP 9672481 A JP9672481 A JP 9672481A JP 9672481 A JP9672481 A JP 9672481A JP S57211503 A JPS57211503 A JP S57211503A
Authority
JP
Japan
Prior art keywords
disc
turntable
displacement
measured
electrode
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
JP9672481A
Other languages
Japanese (ja)
Inventor
Mitsuo Sato
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.)
Hitachi Ltd
Original Assignee
Hitachi 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 Hitachi Ltd filed Critical Hitachi Ltd
Priority to JP9672481A priority Critical patent/JPS57211503A/en
Publication of JPS57211503A publication Critical patent/JPS57211503A/en
Pending legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B19/00—Driving, starting, stopping record carriers not specifically of filamentary or web form, or of supports therefor; Control thereof; Control of operating function ; Driving both disc and head
    • G11B19/20—Driving; Starting; Stopping; Control thereof
    • G11B19/2009—Turntables, hubs and motors for disk drives; Mounting of motors in the drive
    • G11B19/2018—Incorporating means for passive damping of vibration, either in the turntable, motor or mounting
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B7/00—Measuring arrangements characterised by the use of electric or magnetic techniques
    • G01B7/30—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring angles or tapers; for testing the alignment of axes
    • G01B7/31—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring angles or tapers; for testing the alignment of axes for testing the alignment of axes
    • G01B7/312—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring angles or tapers; for testing the alignment of axes for testing the alignment of axes for measuring eccentricity, i.e. lateral shift between two parallel axes
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B17/00—Guiding record carriers not specifically of filamentary or web form, or of supports therefor
    • G11B17/02—Details
    • G11B17/022—Positioning or locking of single discs
    • G11B17/028—Positioning or locking of single discs of discs rotating during transducing operation

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Supporting Of Heads In Record-Carrier Devices (AREA)
  • Measurement Of Length, Angles, Or The Like Using Electric Or Magnetic Means (AREA)

Abstract

PURPOSE:To enable reliable measurement of the displacement of a disc by arranging two or more equal-area electrodes on the radius vector of a turntable, detecting thereby a change in electrostatic capacitance simultaneously, taking the difference in detection, and thereby eliminating an error caused by the plane vibration of the turntable. CONSTITUTION:A disc 3 is set on a turntable 4 and a reference electrode 1 is arranged at the outer-peripheral part of the disc 3, while a measuring electrode 2 having an area equal to that of the electrode 1 is arranged at a part to be measured of the disc. The turntable 4 is rotated by a motor 8, a change in electrostatic capacitance is measured, and a difference component is taken out by a differential unit 5, transduced into a voltage by a capacitance-voltage transducing circuit 6 and displayed in a recorder 7. Accordingly, an error due to the plane vibration of the turntable is eliminated and thus the amount of displacement of the disc is measured with reliability.
JP9672481A 1981-06-24 1981-06-24 Measuring method for displacement of disc Pending JPS57211503A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP9672481A JPS57211503A (en) 1981-06-24 1981-06-24 Measuring method for displacement of disc

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP9672481A JPS57211503A (en) 1981-06-24 1981-06-24 Measuring method for displacement of disc

Publications (1)

Publication Number Publication Date
JPS57211503A true JPS57211503A (en) 1982-12-25

Family

ID=14172676

Family Applications (1)

Application Number Title Priority Date Filing Date
JP9672481A Pending JPS57211503A (en) 1981-06-24 1981-06-24 Measuring method for displacement of disc

Country Status (1)

Country Link
JP (1) JPS57211503A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0300336A2 (en) * 1987-07-22 1989-01-25 Slovenska Akademia Vied Disc recording medium and equipment for its rotary and linear motion
EP1643488A2 (en) * 2004-09-30 2006-04-05 Hitachi Global Storage Technologies B. V. Disc drive
JP2010032478A (en) * 2008-07-31 2010-02-12 Toray Ind Inc Forming regimes monitoring device and method of fiber-reinforced plastic, and manufacturing method of fiber reinforced plastics therewith

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5543476A (en) * 1978-09-25 1980-03-27 Yokogawa Hokushin Electric Corp Displacement measuring device

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5543476A (en) * 1978-09-25 1980-03-27 Yokogawa Hokushin Electric Corp Displacement measuring device

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0300336A2 (en) * 1987-07-22 1989-01-25 Slovenska Akademia Vied Disc recording medium and equipment for its rotary and linear motion
EP0300336A3 (en) * 1987-07-22 1990-03-14 Slovenska Akademia Vied Disc recording medium and equipment for its rotary and linear motion
EP1643488A2 (en) * 2004-09-30 2006-04-05 Hitachi Global Storage Technologies B. V. Disc drive
EP1643488A3 (en) * 2004-09-30 2007-08-08 Hitachi Global Storage Technologies B. V. Disc drive
JP2010032478A (en) * 2008-07-31 2010-02-12 Toray Ind Inc Forming regimes monitoring device and method of fiber-reinforced plastic, and manufacturing method of fiber reinforced plastics therewith

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