JPS5542301A - Magnetic disc memory unit - Google Patents
Magnetic disc memory unitInfo
- Publication number
- JPS5542301A JPS5542301A JP11328378A JP11328378A JPS5542301A JP S5542301 A JPS5542301 A JP S5542301A JP 11328378 A JP11328378 A JP 11328378A JP 11328378 A JP11328378 A JP 11328378A JP S5542301 A JPS5542301 A JP S5542301A
- Authority
- JP
- Japan
- Prior art keywords
- pattern
- speed
- magnetic disc
- generator
- disc
- 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
Landscapes
- Rotational Drive Of Disk (AREA)
Abstract
PURPOSE:To prevent a magnetic disc and head from colliding in a fixed-head magnetic disc memory unit by slowly decelerating the rotation speed of a disc to a stop according to a preset rotation deceration pattern at the time of the occurrence of an earthquake. CONSTITUTION:Once an earthquake occurs and shock-sensing switch 13 operates, power supply to motor 5 is cut off through the operation of driver circuit 6, a deceleration pattern is generated by pattern generator 14, and a voltage in accordance with the pattern is generated by voltage converter 15 and then applied across a comparator. The output of speed generator 7, on the other hand, is waveform- shaped by waveform shaping circuit 8 and supplied to the comparator. Here, when the output of speed generator 7 is greater than that of pattern generator 14, a brake starts operating to decelerate the speed of the rotation of a disc smoothly to a stop as shown by the dotted line.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP11328378A JPS5542301A (en) | 1978-09-14 | 1978-09-14 | Magnetic disc memory unit |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP11328378A JPS5542301A (en) | 1978-09-14 | 1978-09-14 | Magnetic disc memory unit |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS5542301A true JPS5542301A (en) | 1980-03-25 |
Family
ID=14608243
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP11328378A Pending JPS5542301A (en) | 1978-09-14 | 1978-09-14 | Magnetic disc memory unit |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5542301A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2008117480A (en) * | 2006-11-06 | 2008-05-22 | Fuji Xerox Co Ltd | Image forming device and program |
-
1978
- 1978-09-14 JP JP11328378A patent/JPS5542301A/en active Pending
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2008117480A (en) * | 2006-11-06 | 2008-05-22 | Fuji Xerox Co Ltd | Image forming device and program |
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