JPS5979475A - Protecting device of magnetic head for magnetic disk device - Google Patents
Protecting device of magnetic head for magnetic disk deviceInfo
- Publication number
- JPS5979475A JPS5979475A JP19030482A JP19030482A JPS5979475A JP S5979475 A JPS5979475 A JP S5979475A JP 19030482 A JP19030482 A JP 19030482A JP 19030482 A JP19030482 A JP 19030482A JP S5979475 A JPS5979475 A JP S5979475A
- Authority
- JP
- Japan
- Prior art keywords
- signal
- magnetic head
- detection signal
- circuit
- servo system
- 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
- 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
-
- 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
- G11B5/58—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 for the purpose of maintaining alignment of the head relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following
- G11B5/596—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 for the purpose of maintaining alignment of the head relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following for track following on disks
Abstract
Description
【発明の詳細な説明】
〔発明の技術分野〕
本発明は磁気ディスク装置に卦けろ磁気ヘッドの保護装
置に関する。DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a protection device for a magnetic head in a magnetic disk device.
一般に、磁気ディスク装置におけろ磁気ディスク上の所
望トラックへの位置決め制御はサーボ系を備えて行われ
ている。Generally, in a magnetic disk drive, positioning control to a desired track on a magnetic disk is performed using a servo system.
ところが、何らかの異常によりサーボ系が発振した場合
磁気ヘッドが機械的な振切な伴う異常動作を起こし、著
しい場合には磁気ヘッドと磁気ディスクが接触Ｊ−るこ
とになる。その結果、４１１ｉ気ディスク面の破損や（
１′ＦＡ気ヘツドのクラッシュといった致命的な故障を
引き起すこととなり、結局システムダウンを招くおそれ
がある。However, if the servo system oscillates due to some abnormality, the magnetic head will undergo abnormal operation accompanied by mechanical vibration, and in severe cases, the magnetic head and magnetic disk may come into contact. As a result, damage to the 411i disk surface or (
This may cause a fatal failure such as a crash of the 1' FA air head, which may eventually lead to system down.
そこで、本発明は、かかる事態を防１トシ、磁気ヘッド
を有効に保ギにしうる保、、、ｊＩ装装置化化提供るこ
とを目的とする。SUMMARY OF THE INVENTION Therefore, it is an object of the present invention to prevent such a situation and to provide a system that can effectively protect a magnetic head.
上記目的を達成するために、不発明の保護装置ば、４Ｇ
気ヘツドの位置検出１ｄ号の変動成分を信号処理回路に
より直流化し、その直流信号と予め定められた基準１＋
Ｍを比較回路により比較して位置検出信号の変動成分の
振幅が異常値である場合にそのＦｉ″を報知し、その報
知信号な保護装置により磁気ヘッドの保１１φゲ行うよ
うにした点に特徴を有する０
〔ン［ｊｌν１のプ３施イン１１〕
以下、図面を〃ド照して本発明の実施例について詳細に
説明する。In order to achieve the above purpose, an uninvented protection device, 4G
The fluctuation component of the air head position detection No. 1d is converted to DC by a signal processing circuit, and the DC signal and a predetermined standard 1+ are
M is compared by a comparison circuit, and if the amplitude of the fluctuation component of the position detection signal is an abnormal value, that Fi'' is notified, and the magnetic head is protected by a protection device based on the notification signal. Embodiments of the present invention will now be described in detail with reference to the drawings.
第１図は本発明による保贈装置の一実施例を示すブロッ
ク図であり、特にサーボ系の発振を検出する部分を示し
ている。第１図において２図示しないサーボ系におけろ
磁気ヘッドから出力された位ｌｉｄ検出信号■Ｓがコン
デンサＣ１、抵抗Ｒ＋から成る直流阻止回路２を介して
入力されろ。直流阻止回路２により位ｉ５Ｊ検出信号Ｖ
３の直流分がカットされ、ダイオードＤ、コンデンサＣ
２ｔｈ抵抗Ｒ２から成７′）整γ１１９回路４に入力さ
れ、位６を構出信号ｖＳの交流５１ｊ、分（変動成分）
のレベルに応じた直流信号に変換されろ。整流回路４か
らの出力］１■流信号は１曽輻器ＯＰ、抵抗Ｒｓ 、
Ｒａ、コンデンサＣ３から成７）積分回路に入力され、
前記交流成分の積分値に比例する信号ＶＡに変換されろ
。積分出力１８号ＶＡは比較回路８において基準電圧Ｖ
Ｒと突き合わされ。FIG. 1 is a block diagram showing an embodiment of the gift protection device according to the present invention, and particularly shows a portion for detecting oscillation of a servo system. In FIG. 1, a lid detection signal S output from a magnetic head in a servo system (not shown) is inputted via a DC blocking circuit 2 consisting of a capacitor C1 and a resistor R+. The DC blocking circuit 2 outputs the i5J detection signal V.
3 DC component is cut, diode D, capacitor C
The AC 51j of the signal vS, which is input to the γ119 circuit 4 and composed of the 2th resistor R2, is input to the γ119 circuit 4 (fluctuation component).
be converted into a DC signal according to the level of Output from rectifier circuit 4] 1 current signal is 1 radiator OP, resistor Rs,
Ra, composed of capacitor C3 7) Input to the integrating circuit,
It is converted into a signal VA proportional to the integral value of the AC component. Integral output No. 18 VA is the reference voltage V in the comparator circuit 8.
Matched with R.
基準電圧ＶＲに対して積分出力信号ＶＡが高くなった場
合（■＜ＶＡ）に比較回路８から発振検出信号ｖＢが出
力されろ。When the integrated output signal VA becomes higher than the reference voltage VR (■<VA), the comparison circuit 8 outputs the oscillation detection signal vB.
次に動作を説明する。第２図（Ａ）は゛す゛−ボ系が発
振した場合の位置検出信号ＶＳの波形図、（Ｂ）はその
位置検出信号Ｖ８の波形に対して得られる積分回路６の
出力信号ＶＡの波形図である。Next, the operation will be explained. FIG. 2 (A) is a waveform diagram of the position detection signal VS when the subsystem oscillates, and (B) is a waveform diagram of the output signal VA of the integrating circuit 6 obtained for the waveform of the position detection signal V8. It is.
サーボ系が正常に動作しており、磁気ヘッドが目標トラ
ックに正しく位置している場合には位置検出信号Ｖｓは
所定の直流レベルで一定となっており、その交流成分は
第２図（Ｎに示すように比較的小さなものである。また
、磁気ヘッドが目標トラックからずれているとしても位
１４検出信号ＶＳはその位置誤差に対応する直流レベル
で安定しており交流成分は少ない。このような正常状態
においてに、直流阻止回路２の出力はほぼゝ０＃レベル
に近く、従って整流回路４の出力も低いレベルとなって
いる。このため、積分回路６の増幅器ＯＰは反転積分の
結果、基準電圧ＶＲよりも低レベルの７ｉＩｆ分出力信
号ＶＡを出力する。この積分出力信号ＶＡは比較１ｉ３
１１ｘｇ ８の反転入力側に入力される。したがって、
比較回路８の出力信号ｖＢは論理レベル１Ｌ“どなる。When the servo system is operating normally and the magnetic head is correctly positioned on the target track, the position detection signal Vs is constant at a predetermined DC level, and its AC component is shown in Figure 2 (N). As shown, it is relatively small.Furthermore, even if the magnetic head deviates from the target track, the position 14 detection signal VS is stable at the DC level corresponding to the position error, and there is little AC component. In a normal state, the output of the DC blocking circuit 2 is close to the 0# level, and therefore the output of the rectifier circuit 4 is also at a low level.Therefore, the amplifier OP of the integrating circuit 6 receives the reference signal as a result of inversion integration. Outputs an output signal VA of 7iIf at a lower level than the voltage VR.This integrated output signal VA is
It is input to the inverting input side of 11xg8. therefore,
The output signal vB of the comparator circuit 8 reaches the logic level 1L.
このことはサーボ系が正常であることを報知すゐ〇
一方、電気回路あるいは機構部分等に何らかの異常が発
生し、サーボ系が発振すると、第２図（Ａ）のように位
置検出信号ＶＢの振幅が大きくなる。This notifies you that the servo system is normal. On the other hand, if some abnormality occurs in the electric circuit or mechanical part and the servo system oscillates, the position detection signal VB is output as shown in Figure 2 (A). amplitude becomes larger.
つまり、磁気ヘッドがサーボ系の発振によって４辰呻す
るからである。位１４検出信号ＶＳは上述同様に直流阻
止回路２、整流回路４を介して振幅の大きくなった交流
成分に対応する直流信号に変換される。この直流信号レ
ベルは大きいから積分回路６での積分出力信号ＶＡは基
準市、圧ＶＲより高いレヘルト７：Ｃ；ｂ （”Ａ ＞
■Ｒ）。その結果、比較回路８は論理レベル’ Ｈ“
の信号を出力し、発振検出信号ＶＢの内容はサーボ系異
常を報知することとなろ−この発振検出信号ｖＢは保護
装置に与えられろ。In other words, the magnetic head makes four noises due to the oscillation of the servo system. Similarly to the above, the detection signal VS is converted into a DC signal corresponding to the AC component with increased amplitude via the DC blocking circuit 2 and the rectifier circuit 4. Since this DC signal level is large, the integrated output signal VA from the integrating circuit 6 is higher than the reference voltage VR.
■R). As a result, the comparator circuit 8 has a logic level 'H''.
The content of the oscillation detection signal VB is to notify a servo system abnormality - this oscillation detection signal vB should be given to the protection device.
保護装置としては、磁気ディスク面に対して磁気ヘッド
をリトラクトさせろ０
な卦、磁気ヘッドが他のトラックに移動しながらシーク
動作を行っている場合には位置決め動作とは異なり、サ
ーボ系が発振することはないｏしかし、磁気ヘッドの移
動に伴なって位置検出信号Ｖ８が大きく変動するため、
この変動を誤って発振状態として検出してしまう可能性
ありうるが、その鴨合には磁気ヘッドがシーク状態にあ
るとき発振検出Ｑの作を停止させろか、発振検出１１号
ＶＢの出力を禁止する等の処置を講ずればよい。As a protection device, retract the magnetic head relative to the magnetic disk surface.However, if the magnetic head performs a seek operation while moving to another track, the servo system will oscillate, unlike a positioning operation. However, as the position detection signal V8 fluctuates greatly as the magnetic head moves,
There is a possibility that this fluctuation may be mistakenly detected as an oscillation state, but in that case, when the magnetic head is in the seek state, the operation of oscillation detection Q should be stopped, or the output of oscillation detection No. 11 VB should be prohibited. All you have to do is take measures such as:
以上の構成からなる本発明によれば、サーボ系の’Ｍ−
ＩＨに基づく磁気ヘッドの磁気ディスクへの接触、衝突
事故を効果的に防止でき、その結果記憶内容の安全性を
４ｊｌＡ保することができ口。According to the present invention having the above configuration, the 'M-
It is possible to effectively prevent contact and collision accidents of magnetic heads based on IH with magnetic disks, and as a result, the safety of stored contents can be maintained.
第１図に本発明による磁気ヘッド保謀装置の一実施＋／
１ｊＶＣ，おいて、発（層検出部ケ示すブロック、第２
図（Ａ）ｒ拭分出力信号ＶＡの波形図、（Ｂ）は発振検
出信号ｖＢの波形図である。
２・・・直υｉｔ ｌ′Ｊ１１市回路、捲回路・整流回
路、６・・・積分回路、８・・・比較回路。FIG. 1 shows an implementation of the magnetic head security device according to the present invention.
1jVC, and the block indicating the layer detection section, the second
(A) is a waveform diagram of the wipe output signal VA, and (B) is a waveform diagram of the oscillation detection signal vB. 2... Direct υit l'J11 circuit, winding circuit/rectifier circuit, 6... Integrating circuit, 8... Comparing circuit.
Claims (1)
ｆｆに制御駆動するサーボ系を備えた磁気ディスク獲ｊ
＋’ｉ Ｋ ｋいて、 １Ω、置検出信号の変動成分を直流化する信号処理回路
と、 信号処理回路からの直流出力信号を予め定められた基準
値と比ｉ１ダして…■記位１ξ検出信号の変動成分の振
幅が異材である旨を報知′ｆる信号を出力する比叡回路
と、 前記報知信号？受けて磁気ヘッドの保１；φ動作を行う
保１．φ装置准とを１１１Ｎえたことを特徴とすな磁気
ディスク装置に〉ける磁気ヘッドの保護装置。[Claims] 41 & air head is set to a desired position i based on the position 1d detection signal.
A magnetic disk drive equipped with a servo system that controls and drives ff.
+'i K k, 1Ω, a signal processing circuit that converts the fluctuation component of the position detection signal into DC, and a DC output signal from the signal processing circuit is compared with a predetermined reference value i1... ■ Marking 1ξ a Hiei circuit that outputs a signal indicating that the amplitude of the fluctuation component of the detection signal is a foreign material; and the notification signal? Holding of the magnetic head 1; Holding 1 of performing φ operation. 1. A protection device for a magnetic head in a magnetic disk device, characterized in that a φ device has a diameter of 111N.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP19030482A JPS5979475A (en) | 1982-10-29 | 1982-10-29 | Protecting device of magnetic head for magnetic disk device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP19030482A JPS5979475A (en) | 1982-10-29 | 1982-10-29 | Protecting device of magnetic head for magnetic disk device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS5979475A true JPS5979475A (en) | 1984-05-08 |
Family
ID=16255925
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP19030482A Pending JPS5979475A (en) | 1982-10-29 | 1982-10-29 | Protecting device of magnetic head for magnetic disk device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5979475A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH02128214U (en) * | 1989-03-31 | 1990-10-23 | ||
| JPH02149114U (en) * | 1989-05-19 | 1990-12-19 |
-
1982
- 1982-10-29 JP JP19030482A patent/JPS5979475A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH02128214U (en) * | 1989-03-31 | 1990-10-23 | ||
| JPH02149114U (en) * | 1989-05-19 | 1990-12-19 |
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