JPS576471A - Servo-information detecting system of magnetic disk - Google Patents

Servo-information detecting system of magnetic disk

Info

Publication number
JPS576471A
JPS576471A JP7971680A JP7971680A JPS576471A JP S576471 A JPS576471 A JP S576471A JP 7971680 A JP7971680 A JP 7971680A JP 7971680 A JP7971680 A JP 7971680A JP S576471 A JPS576471 A JP S576471A
Authority
JP
Japan
Prior art keywords
magnetic disk
control signal
disk
servo
gaps
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
JP7971680A
Other languages
Japanese (ja)
Inventor
Teruaki Emori
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.)
Fujitsu Ltd
Original Assignee
Fujitsu Ltd
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 Fujitsu Ltd filed Critical Fujitsu Ltd
Priority to JP7971680A priority Critical patent/JPS576471A/en
Publication of JPS576471A publication Critical patent/JPS576471A/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
    • G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
    • G11B5/48—Disposition or mounting of heads or head supports relative to record carriers ; arrangements of heads, e.g. for scanning the record carrier to increase the relative speed
    • G11B5/54—Disposition or mounting of heads or head supports relative to record carriers ; arrangements of heads, e.g. for scanning the record carrier to increase the relative speed with provision for moving the head into or out of its operative position or across tracks
    • G11B5/55—Track change, selection or acquisition by displacement of the head
    • G11B5/5521—Track change, selection or acquisition by displacement of the head across disk tracks
    • G11B5/5526—Control therefor; circuits, track configurations or relative disposition of servo-information transducers and servo-information tracks for control thereof

Abstract

PURPOSE:To generate a polyphase control signal having a prescribed phase difference, by a simple constitution, and to obtain an exact servo-speed information, by providing plural fead gaps having a prescribed length at prescribed intervals in the direction of the diameter of a disk, on a control signal read head. CONSTITUTION:Plural read gaps, for instance, two pieces HG1, HG2 of a read head HD are provided in the direction of the diameter of a magnetic disk, length of both is same as the width of each odd and even number track O, E of the magnetic disk, and a gap pitch is made about 1.5 times as wide as the width of the tracks O, E. Accordingly, a polyphase control signal which has no discontinuous point and corresponds to a position error of two phases, etc. of a phase difference of linear 90 deg., etc. in the direction of the diameter of the disk is generated through the gaps HG1, HG2. It is unnecessary to record a polyphase control signal, etc. in the disk, and an exact speed signal is formed by a simple constitution, and a stable magnetic disk servo-information is obtained.
JP7971680A 1980-06-13 1980-06-13 Servo-information detecting system of magnetic disk Pending JPS576471A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP7971680A JPS576471A (en) 1980-06-13 1980-06-13 Servo-information detecting system of magnetic disk

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP7971680A JPS576471A (en) 1980-06-13 1980-06-13 Servo-information detecting system of magnetic disk

Publications (1)

Publication Number Publication Date
JPS576471A true JPS576471A (en) 1982-01-13

Family

ID=13697923

Family Applications (1)

Application Number Title Priority Date Filing Date
JP7971680A Pending JPS576471A (en) 1980-06-13 1980-06-13 Servo-information detecting system of magnetic disk

Country Status (1)

Country Link
JP (1) JPS576471A (en)

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