JPS62208477A - Magnetic disk device - Google Patents

Magnetic disk device

Info

Publication number
JPS62208477A
JPS62208477A JP4960686A JP4960686A JPS62208477A JP S62208477 A JPS62208477 A JP S62208477A JP 4960686 A JP4960686 A JP 4960686A JP 4960686 A JP4960686 A JP 4960686A JP S62208477 A JPS62208477 A JP S62208477A
Authority
JP
Japan
Prior art keywords
circuit
position signal
output
read
value
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
JP4960686A
Other languages
Japanese (ja)
Inventor
Toshibumi Mori
俊文 森
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.)
NEC Corp
Original Assignee
NEC 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 NEC Corp filed Critical NEC Corp
Priority to JP4960686A priority Critical patent/JPS62208477A/en
Publication of JPS62208477A publication Critical patent/JPS62208477A/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
    • G11B19/02—Control of operating function, e.g. switching from recording to reproducing
    • G11B19/04—Arrangements for preventing, inhibiting, or warning against double recording on the same blank or against other recording or reproducing malfunctions
    • 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
    • G11B5/553—Details
    • G11B5/5547—"Seek" control and circuits therefor

Landscapes

  • Moving Of The Head To Find And Align With The Track (AREA)

Abstract

PURPOSE:To shorten the access time by providing a means which attains read and write actions when the peak value of a position signal detected by a peak detection means is smaller than the value of a position signal corresponding to a maximum error where a write action is performable. CONSTITUTION:Comparators 4 and 5 compare the position signal with a reference voltage -Vr and a reference signal +Vr. In order for an AND circuit 10 to take an AND between the outputs of the comparators 4 and 5, the output 106 of the AND circuit 10 is outputted so as to stand at '1' while the position signal lies in a range of -Vr-+Vr. In order for an AND circuit 11 to take on AND between the output 106 of the AND circuit 10 and positioning mode signal 107, the output of the AND circuit 11 becomes '1' while the position signal lies in a range of -Vr-+Vr under the positioning control. Here, ¦Vr¦ is the value of the position signal corresponding to the maximum position error where read and write actions are always performable. Thus in accordance with the degree of the stability of the position signal, the read and write actions becomes possible, whereby the access time can be shortened with high reliability.

Description

【発明の詳細な説明】 〔産業上の利用分野〕 本発明は磁気ディスク装置に関し、嵜に立置決め制御回
路を改良した磁気ディスク装置に関する。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a magnetic disk device, and more particularly to a magnetic disk device having an improved vertical positioning control circuit.

〔従来の技術〕[Conventional technology]

従来の磁気ディスク装置は、磁気ディスクのサーボ面に
書かれた位置決め信号により制御する位置決め制御回路
を有しているが、シーク動作終了時、速度制御から位置
決め制御になったとき位置決めが不安定になっているた
め、シーク動作終了後一定時間だけリード、ライト動作
を行なえないようにしている。Conventional magnetic disk drives have a positioning control circuit that is controlled by positioning signals written on the servo surface of the magnetic disk, but when the seek operation is completed and the speed control changes to positioning control, the positioning becomes unstable. Therefore, read and write operations are not allowed for a certain period of time after the seek operation is completed.

〔発明が解決しようとする問題点〕[Problem that the invention seeks to solve]

上述し九従来の磁気ディスク装置は、シーク動作終了後
の所定期間リード、ライト動作を行なえないようになっ
ているため、シーク終了後、前記所定期間内の早い時刻
に位置決めが安定した場合でもリード、ライト動作が行
なえず、アクセスタイムが長くなる欠点があった。The nine conventional magnetic disk drives mentioned above are not able to perform read or write operations for a predetermined period of time after the end of a seek operation. However, it has the disadvantage that write operations cannot be performed and access time becomes long.

〔問題点を解決するための手段〕[Means for solving problems]

本発明の磁気ディスク装置は、速度制御から位置決め制
御に変化してから位置４５号が正極でかつ最大値又は負
極でかつ最小値となる値を検出するピーク検出器と前記
ピーク検出器より検出された位置信号のピーク値が正常
にリード、ライト動作を行なえる最大の位置誤差に相当
する位置信号の値工９小さければリード、ライト動作を
可能とする回路を有している０ 〔実施例〕 次に、本発明について図面を参照して説明するＯ第１図
は本発明の一実施例の回路図である。位置信号を微分す
る微分回路１．微分回路１の出力をＯｖと比較し位置信
号の傾きが正極で“１“を出力するコンパレータ２９位
置信号とＯｖを比較し位置信号が正極で“１“を出力す
るコンパレータ３９位ｖｔ侶号と基準電圧−Ｖｒを比較
し位ｆ侶号が基準電圧−Ｖｒニジ大きいとき“ｌ“を出
力するコンパレータ４２位置信号と基準′１圧＋Ｖｒと
比較し位置信号が゛基準゛電圧＋Ｖｒ工９小さいとき”
１　”　ｅ出カーｆ’ルコ／パレータ５．コンｉ（レー
タ２の出力を反転させるＮＵＴ回路６．コンｉ（レータ
３の出力を反転させるＮ（ＪＴＩｇ１ｍ４７．コンｉく
レータ２の出力とＮ　ＯＴ回路７の出力の論理積を出力
するＡＮＬ）回ｗｒ８．コンパレータ３の出力とＮＯＴ
回路６の論理）ｔ＊を出力するＡＮＬ）回路９゜ＡＮｉ
）回路８の出力とＡＮＤ回路９の出力の論理和を出力す
る（Ｊ　ｌ（、回路１２．　コンパレータ４とコンパレ
ータ５の１倫理積を出力するＡＮＬ）回路１０゜ＡＮＩ
Ｊ回路１０の出力と位置決め制御中゛１″になる位置決
めモード信号の論理積を出力するＡＮＩ）回路１１，０
几回路１２の出力をＣＬＯＣＫ入力。The magnetic disk drive of the present invention includes a peak detector that detects a value at which position No. 45 is a positive pole and a maximum value or a negative pole and a minimum value after changing from speed control to positioning control; If the peak value of the position signal corresponding to the maximum position error that allows normal read and write operations is smaller than 9, the circuit has a circuit that enables read and write operations.[Example] Next, the present invention will be explained with reference to the drawings. FIG. 1 is a circuit diagram of an embodiment of the present invention. Differentiation circuit for differentiating position signals 1. Comparator 29 compares the output of the differentiating circuit 1 with Ov and outputs "1" if the slope of the position signal is positive. Comparator 39 compares the position signal with Ov and outputs "1" if the position signal is positive. The comparator 42 outputs "l" when the reference voltage -Vr is greater than the reference voltage -Vr.Comparing the position signal with the reference voltage +Vr, the position signal is smaller than the reference voltage +Vr. ”
1 ” e output car f' Ruco/Parameter 5. Condenser i (NUT circuit that inverts the output of Lator 2 6. Condenser i (NUT circuit that inverts the output of Layer 3) ANL which outputs the AND of the output of circuit 7) times wr8. Output of comparator 3 and NOT
Logic of circuit 6) ANL that outputs t*) Circuit 9゜ANi
) Outputs the logical sum of the output of circuit 8 and the output of AND circuit 9 (J l (, circuit 12. ANL that outputs the 1 logic product of comparator 4 and comparator 5) Circuit 10゜ANI
ANI) circuit 11,0 that outputs the AND of the output of the J circuit 10 and the positioning mode signal that becomes "1" during positioning control.
CLOCK input the output of the circuit 12.

ＡＮｉ）回路１１の出力ｆ：８　Ｅ　’Ｉ’入力、ＤＡ
ＴＡを“０１とするＬ）　−Ｆ／Ｆ回路１３．速度制御
から位置決め制−に変ったとき一定期間”１”を出力す
るクングルクヨット回路１４．シングル７ヨツト回路１
４と１）　−Ｆ／Ｆ回路１３の論理績をと９リード・ラ
イト不可信号を出力するＡＮＩ）回路１５から構成され
る。ANi) Output f of circuit 11: 8 E 'I' input, DA
(L with TA set to “01”) -F/F circuit 13. Kungluk yacht circuit that outputs “1” for a certain period when changing from speed control to positioning system 14. Single 7 yacht circuit 1
4 and 1) - ANI) circuit 15 which outputs the logic result of the F/F circuit 13 and 9 a read/write disable signal.

次に第２図のタイムチャートを参照しながら動作を説明
する０第２図の位置信号１０１は微分回路１にニジ微分
され、出力１０２となり、この出力１０２はコ／パＶ−
夕２でＯｖと比較され出力１０３が得られる。一方、位
置信号１０１はコンパレータ３でＯＶと比較され出力１
０４が得りｎる。コンパレータ２の出力１０３と、コン
パレータ３の出力１０４を入力とするＮＵＴ回路７の出
力をＡＮＤ回路８．で論理積をとり、又、コンｉ（レー
タ２の出力１０３を入力とするＮＯＴ回路６とコンパレ
ータ３の出力１０４をＡＮＬ）回路９で論理績をとる。Next, the operation will be explained with reference to the time chart in FIG. 2.The position signal 101 in FIG.
At evening 2, it is compared with Ov and output 103 is obtained. On the other hand, the position signal 101 is compared with OV by comparator 3 and output 1
04 is obtained. The output of the NUT circuit 7 whose inputs are the output 103 of the comparator 2 and the output 104 of the comparator 3 is ANDed by the AND circuit 8. A logical product is taken by a comparator i circuit 9 (NOT circuit 6 which inputs the output 103 of the lator 2 and an ANL from the output 104 of the comparator 3).

ＡＮＤ回路８の出力とＡＮＩ）回路９の出力を０凡回路
１２で論理和をとることにより位置信号１０１が正極で
かつ最大値又は負極でかつ最小値からＯｖｌでの間Ｏｆ
（、回路１２が“１“を出力する。これにエリ、（Ｊｉ
（、回路１２の出力１０５が“Ｏ“→”１“に変化する
のは、位置１６号が正極でかつ最大値になった時、又は
負極でかつ最小値になったときでめる〇 一方、位置１キ号はコンパレータ４お工びコンパノー夕
５でそれぞれ基準電圧−Ｖｒおよび基準電圧子Ｖｒと比
較されコンパレータ４の出力とコンパレータ５の出力は
ＡＮｉ）１ｇｌ路１０で論理積上とるためＡＮＬ）回路
１０の出力１０６は位置信号が−Ｖｒ　〜＋　Ｖｒの間
ｍ　ｔ　ｌ　（！：なる工うに出力する０又、ＡＮＬ）
回路１０の出力１０６は、Ａ　ＩＱ　ｊ）回路１１で位
置決めモード信号１０７と論理積をとるためＡＮＤ回路
１１の出力は位置決め制御中でかつ位置信号が−Ｖｒ〜
十Ｖｒの間“１１となる。ここでｌ　Ｖｒ　ｌは正常に
リード、ライト動作を行なえる位置誤差が最大のときに
相当する位置信号の１１ｉとしておく。Ｏａ回路１２の
出力１０５ＶｉＬ）−Ｆ／Ｆ　ｌ　３のＣＬＯＣＫ入力
、ＡＮＤ回路１１の出力はＤ−に’／Ｆ１３のＳＥＴ入
力となっているため、速度制御中はＤ　−Ｆ／Ｆ　１３
の出力１０８は”１”となっている。速度制御から位置
決め制御になり位ｖｊｔ１Ｍ号が−Ｖｒ〜＋Ｖｒの間で
かつ正極で最大値又は負極で最小値になったときＬ）−
１’／Ｆ１３の出力は”Ｏ“となる。一方、速度制御か
ら位置決め一ド・ライト不可信号１１０ｔｌ−得る０位
置決め制御になってからＡＮＤ回路１５の出力が“１“
の間リード、ライト動作を禁止しておくことにより位置
決めが安定した直後リード、ライト動作を行なえる。By logically ORing the output of the AND circuit 8 and the output of the ANI) circuit 9, the position signal 101 is outputted between the positive polarity, the maximum value or the negative polarity, and Ovl from the minimum value.
(, circuit 12 outputs “1”.Eri, (Ji
(The output 105 of the circuit 12 changes from "O" to "1" when position 16 is positive and reaches the maximum value, or when it is negative and reaches the minimum value.) On the other hand, the position 1 key is compared with the reference voltage -Vr and the reference voltage Vr by comparator 4 and comparator 5, respectively, and the output of comparator 4 and the output of comparator 5 are logically multiplied by ANi)1gl path 10. ANL) The output 106 of the circuit 10 is a position signal between -Vr and +Vr.
Since the output 106 of the circuit 10 is ANDed with the positioning mode signal 107 in the A IQ j) circuit 11, the output of the AND circuit 11 is in the positioning control mode and the position signal is -Vr~
It becomes "11" during 10 Vr.Here, l Vr l is set to 11i, which is the position signal corresponding to the maximum position error that allows normal read and write operations.The output of Oa circuit 12 is 105ViL)-F/ Since the CLOCK input of F l 3 and the output of the AND circuit 11 are the SET input of '/F13 to D-, D - F/F 13 is input during speed control.
The output 108 of is "1". When speed control changes to positioning control and position vjt1M is between -Vr and +Vr and reaches the maximum value at the positive pole or the minimum value at the negative pole L)-
The output of 1'/F13 becomes "O". On the other hand, the output of the AND circuit 15 becomes "1" after the positioning control becomes 0, where the positioning/write disable signal 110tl- is obtained from the speed control.
By prohibiting read and write operations during this period, read and write operations can be performed immediately after positioning is stabilized.

〔発明の効果〕〔Effect of the invention〕

以上説明したように本発明は、位置１−号の安定度に応
じてリード、ライト動作を可能にすることにより、信頼
性を保ったままアクセスタイムが短くでさる効果がある
。As explained above, the present invention has the effect of shortening access time while maintaining reliability by enabling read and write operations depending on the stability of position No. 1-.

【図面の簡単な説明】[Brief explanation of drawings]

第１図は本発明の一実施例の回路図、第２図は第１図の
動作を示すタイミング図である。 １・・・・・・９分回ｇ、２〜５・・・・・・コンパレ
ータ、６〜７・・・・・・Ｎ　Ｏ’１”回路、８〜１１
・・・・・・ＡＮＤ回路、１２・・・・・・０１（回路
、１３・・・・・・Ｄ　−Ｆｉｋｌ、１４・・・・・・
シングルショット回路、１５・・・・・・ＡＮＩ）回路
、１０１・・・・・・位置１６号、１０７・・・・・・
位置決めモード信号、１１０・・・・・・リード・ライ
ト不可信号。FIG. 1 is a circuit diagram of one embodiment of the present invention, and FIG. 2 is a timing diagram showing the operation of FIG. 1. 1...9 minutes g, 2-5...comparator, 6-7...N O'1" circuit, 8-11
...AND circuit, 12...01 (circuit, 13...D -Fikl, 14...
Single shot circuit, 15...ANI) circuit, 101...Position No. 16, 107...
Positioning mode signal, 110...read/write disabled signal.

Claims (1)

【特許請求の範囲】[Claims] 速度制御から位置決め制御に変化してから位置信号が正
極でかつ最大値又は負極でかつ最小値となる値を検出す
るピーク検出手段と、前記ピーク検出手段から検出され
た位置信号のピーク値が正常にリード、ライト動作を行
なえる最大の位置誤差に相当する位置信号の値より小さ
ければリード、ライト動作を可能とする手段を有する磁
気ディスク装置。peak detection means for detecting a value at which the position signal is positive and has a maximum value or negative and has a minimum value after changing from speed control to positioning control; and a peak value of the position signal detected by the peak detection means is normal. A magnetic disk drive having means for enabling read and write operations if the value of the position signal is smaller than the maximum positional error that allows read and write operations.
JP4960686A 1986-03-07 1986-03-07 Magnetic disk device Pending JPS62208477A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP4960686A JPS62208477A (en) 1986-03-07 1986-03-07 Magnetic disk device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP4960686A JPS62208477A (en) 1986-03-07 1986-03-07 Magnetic disk device

Publications (1)

Publication Number Publication Date
JPS62208477A true JPS62208477A (en) 1987-09-12

Family

ID=12835891

Family Applications (1)

Application Number Title Priority Date Filing Date
JP4960686A Pending JPS62208477A (en) 1986-03-07 1986-03-07 Magnetic disk device

Country Status (1)

Country Link
JP (1) JPS62208477A (en)

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