JPS5475018A - Voice coil motor driving circuit - Google Patents
Voice coil motor driving circuitInfo
- Publication number
- JPS5475018A JPS5475018A JP14293477A JP14293477A JPS5475018A JP S5475018 A JPS5475018 A JP S5475018A JP 14293477 A JP14293477 A JP 14293477A JP 14293477 A JP14293477 A JP 14293477A JP S5475018 A JPS5475018 A JP S5475018A
- Authority
- JP
- Japan
- Prior art keywords
- capacitor
- voice coil
- voltage
- coil motor
- energized
- 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.)
- Granted
Links
Abstract
PURPOSE: To simplify the retract operation of a magnetic head at power failure by integrating the discharge current of a capacitor and forming speed voltage, then negatively feedbacking it and determining the speed of a voice coil.
CONSTITUTION: When a power off abnormality occurs, voltage V3 is applied to a transisotr Tr1 and it is energized. A transistor Tr2 is energized by applying voltage V1 between its base input terminal t1 and ground. The charge stored in a capacitor C1 is discharged through a parallel circuit of Tr1, VCM, Tr2, K1, and C2. Discharge currnt (i) is applied to the voice coil motor VCM and operates it. The capacitor C2 integrates the discharge current (i) and capacitor voltage V2 almost shows that of the moving part. Even while the moving part runs at constant speed and strikes on a stopper, it is not excessively shocked and magnetic head is not also damaged.
COPYRIGHT: (C)1979,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP14293477A JPS5475018A (en) | 1977-11-29 | 1977-11-29 | Voice coil motor driving circuit |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP14293477A JPS5475018A (en) | 1977-11-29 | 1977-11-29 | Voice coil motor driving circuit |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS5475018A true JPS5475018A (en) | 1979-06-15 |
JPS5756318B2 JPS5756318B2 (en) | 1982-11-29 |
Family
ID=15327033
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP14293477A Granted JPS5475018A (en) | 1977-11-29 | 1977-11-29 | Voice coil motor driving circuit |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5475018A (en) |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS56106575U (en) * | 1980-01-16 | 1981-08-19 | ||
JPS62149083A (en) * | 1985-12-23 | 1987-07-03 | Hitachi Ltd | Magnetic disk unit |
JPS6431563U (en) * | 1987-08-17 | 1989-02-27 | ||
US6639749B1 (en) | 1999-01-21 | 2003-10-28 | Seagate Technology Llc | Supplying power from a spindle motor in a disc drive system |
US6859340B2 (en) | 2001-03-09 | 2005-02-22 | Seagate Technology Llc | Method and device for retracting an actuator |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS60111504U (en) * | 1983-12-27 | 1985-07-29 | タナシン電機株式会社 | tape recorder |
-
1977
- 1977-11-29 JP JP14293477A patent/JPS5475018A/en active Granted
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS56106575U (en) * | 1980-01-16 | 1981-08-19 | ||
JPS62149083A (en) * | 1985-12-23 | 1987-07-03 | Hitachi Ltd | Magnetic disk unit |
JPS6431563U (en) * | 1987-08-17 | 1989-02-27 | ||
US6639749B1 (en) | 1999-01-21 | 2003-10-28 | Seagate Technology Llc | Supplying power from a spindle motor in a disc drive system |
US6859340B2 (en) | 2001-03-09 | 2005-02-22 | Seagate Technology Llc | Method and device for retracting an actuator |
Also Published As
Publication number | Publication date |
---|---|
JPS5756318B2 (en) | 1982-11-29 |
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