JPS5542301A - Magnetic disc memory unit - Google Patents

Magnetic disc memory unit

Info

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
Application number
JP11328378A
Other languages
Japanese (ja)
Inventor
Kenichi Nishi
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.)
Mitsubishi Electric Corp
Original Assignee
Mitsubishi Electric Corp
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 Mitsubishi Electric Corp filed Critical Mitsubishi Electric Corp
Priority to JP11328378A priority Critical patent/JPS5542301A/en
Publication of JPS5542301A publication Critical patent/JPS5542301A/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

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.
JP11328378A 1978-09-14 1978-09-14 Magnetic disc memory unit Pending JPS5542301A (en)

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)

* Cited by examiner, † Cited by third party
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

Cited By (1)

* Cited by examiner, † Cited by third party
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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