JPS57211503A - Measuring method for displacement of disc - Google Patents
Measuring method for displacement of discInfo
- 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
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.
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)
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)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5543476A (en) * | 1978-09-25 | 1980-03-27 | Yokogawa Hokushin Electric Corp | Displacement measuring device |
-
1981
- 1981-06-24 JP JP9672481A patent/JPS57211503A/en active Pending
Patent Citations (1)
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)
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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