JPS55113173A - Magnetic-head positioning system - Google Patents
Magnetic-head positioning systemInfo
- Publication number
- JPS55113173A JPS55113173A JP2032279A JP2032279A JPS55113173A JP S55113173 A JPS55113173 A JP S55113173A JP 2032279 A JP2032279 A JP 2032279A JP 2032279 A JP2032279 A JP 2032279A JP S55113173 A JPS55113173 A JP S55113173A
- Authority
- JP
- Japan
- Prior art keywords
- head
- speed
- circuit
- temperature
- positioning
- 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
Landscapes
- Moving Of The Head To Find And Align With The Track (AREA)
- Moving Of Head For Track Selection And Changing (AREA)
Abstract
PURPOSE: To position a magnetic head with high reliability by varying a servocontrol constant according to the temperature of a voice coil positioning the magnetic head.
CONSTITUTION: Target speed generating circuit 2 is controlled through control circuit 1 to generate the positioning movement speed of magnetic head 11 through voice coil motor 8 by speed signal generating circuit 4, and the speed of head 11 is servocontrolled through a coarse-fine switching circuit to equalize a set speed to a movement speed at a differential amplifier, thereby exercising coarse control over the position of head 11. Since this circuit 4 has its gain controlled through a thermistor, etc., detecting the temperature of the permanent magnet, etc., of motor 8, the coarse control over the head position can accurately be exercised. Similarly, the positioning of the head is carried out accutately under servocontrol of the coarse control without influencing the temperature by position signal demodulation circuit 12, error signal generating circuit 7, etc., whose servo constant is controlled according to the detected temperature of the permanent magnet of motor 8.
COPYRIGHT: (C)1980,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2032279A JPS55113173A (en) | 1979-02-23 | 1979-02-23 | Magnetic-head positioning system |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2032279A JPS55113173A (en) | 1979-02-23 | 1979-02-23 | Magnetic-head positioning system |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS55113173A true JPS55113173A (en) | 1980-09-01 |
Family
ID=12023885
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP2032279A Pending JPS55113173A (en) | 1979-02-23 | 1979-02-23 | Magnetic-head positioning system |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS55113173A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5003415A (en) * | 1987-06-18 | 1991-03-26 | Qume Corporation | Adaptive head positioning servo-mechanism |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS4968706A (en) * | 1972-10-31 | 1974-07-03 | ||
JPS5084776A (en) * | 1973-12-04 | 1975-07-08 |
-
1979
- 1979-02-23 JP JP2032279A patent/JPS55113173A/en active Pending
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS4968706A (en) * | 1972-10-31 | 1974-07-03 | ||
JPS5084776A (en) * | 1973-12-04 | 1975-07-08 |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5003415A (en) * | 1987-06-18 | 1991-03-26 | Qume Corporation | Adaptive head positioning servo-mechanism |
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