JPS58128057A - Positioning carriage for magnetic disc - Google Patents

Positioning carriage for magnetic disc

Info

Publication number
JPS58128057A
JPS58128057A JP1136282A JP1136282A JPS58128057A JP S58128057 A JPS58128057 A JP S58128057A JP 1136282 A JP1136282 A JP 1136282A JP 1136282 A JP1136282 A JP 1136282A JP S58128057 A JPS58128057 A JP S58128057A
Authority
JP
Japan
Prior art keywords
mass
carriage
arm
gain
positioning
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.)
Granted
Application number
JP1136282A
Other languages
Japanese (ja)
Other versions
JPH0546035B2 (en
Inventor
Hiroshi Koriyama
郡山 博
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
Nippon Electric Co 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 NEC Corp, Nippon Electric Co Ltd filed Critical NEC Corp
Priority to JP1136282A priority Critical patent/JPS58128057A/en
Publication of JPS58128057A publication Critical patent/JPS58128057A/en
Publication of JPH0546035B2 publication Critical patent/JPH0546035B2/ja
Granted legal-status Critical Current

Links

Classifications

    • GPHYSICS
    • G11INFORMATION STORAGE
    • G11BINFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B5/00Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
    • G11B5/48Disposition 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
    • G11B5/54Disposition 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
    • G11B5/55Track change, selection or acquisition by displacement of the head
    • G11B5/5521Track change, selection or acquisition by displacement of the head across disk tracks

Abstract

PURPOSE:To attain accurate positioning, by making positioning point of a mass added to an arm adjustable, and adjusting a resonance frequency and the gain. CONSTITUTION:A carriage 2 fitted to a carriage housing 1, a linear motor activating the said carriage 2, an arm 2' of the carriage 2, and a moving head 7 fitted to the said arm 2' are provided and a mass 10 is newly fitted to the arm section 2'. The mass 10 is threaded in female screw like a nut, the position of the mass is shifted while measuring the vibrating characteristics, an optimum position is obtained and the mass is fixed with an adhesives. In adjusting the position of the mass, the gain of the resonance frequency of the servo system in the positioning mechanism of the magnetic head of a magnetic disc device is decreased by adjusting the position of the mass.

Description

【発明の詳細な説明】 本発明は、磁気ディスク装置に用いられる位置決めキャ
リッジに関する。
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a positioning carriage used in a magnetic disk drive.

通常、可動ヘッド鳳磁気ディスク装置においては、磁気
ディスク上の特定の情報の呼び出しの要求があり次第、
呼び出し時間を最小にするように可動ヘッドが磁気ディ
スクの半径方向に急速に位置決めしなければならない。
Normally, in a movable head magnetic disk device, as soon as there is a request to retrieve specific information on the magnetic disk,
The movable head must be positioned rapidly in the radial direction of the magnetic disk to minimize readout time.

従来のり一タリー型の磁気ディスク装置は第1図(a)
、(b)に示すように、磁気ヘッド7がキャリッジ2に
取り付けられ、とのキャリッジ2が回転軸6を中心に回
転して、磁気ヘッド7を磁気ディスク8上の適切な位置
にもたらし、軸9を回転中心、とする礁気ディスク80
回転にともなつて、磁気デニタの書き込み、読み出しを
行う構造を有していた。キャリッジ2はプイスコイルモ
ータ3により移動するようになっていて、このボイスコ
イルモータ3は、本体に固定された永久磁石(図示せず
)に対して前記キャリッジ2上に取り付けられた線材4
を有するフィル部5が移動するようになっている。
A conventional glue-tally type magnetic disk device is shown in Figure 1(a).
, (b), the magnetic head 7 is attached to the carriage 2, and the carriage 2 rotates around the rotating shaft 6 to bring the magnetic head 7 to an appropriate position on the magnetic disk 8, Reef air disk 80 with rotation center at 9
It had a structure in which writing and reading of magnetic data were performed as it rotated. The carriage 2 is moved by a voice coil motor 3, which moves a wire 4 attached to the carriage 2 with respect to a permanent magnet (not shown) fixed to the main body.
The fill section 5 having a shape is movable.

このコイル部に電流を流すことにより、前記永久磁石と
OIl&lIK力を生じ、これによってキャリッジ2が
移動する。磁気へ多ドの位置決めは、一般に、大気ヘッ
ド位置検出→ボイスコイルモータ制復回路→ボイスコイ
ルモータ用フィル通電→コイル移動→磁気ヘッド移動→
磁気ヘッド位置検出の閉ループを形成するサーが回路系
によって制御される。
By passing a current through this coil portion, an OIl&lIK force is generated with the permanent magnet, thereby causing the carriage 2 to move. Positioning of the magnetic head is generally done by atmospheric head position detection → voice coil motor control circuit → voice coil motor fill energization → coil movement → magnetic head movement →
A circuit system controls a circuit that forms a closed loop for detecting the position of the magnetic head.

ところが、前記りニアモータが呼び出し等O命令により
急速な動作をすると、上述のようなサーボループにおい
ては、共振周波数およびそのゲインが問題になる。この
共振周波数が低すぎたり。
However, when the near motor performs rapid operation due to an O command such as a call, the resonance frequency and its gain become a problem in the servo loop as described above. This resonant frequency may be too low.

そのゲインが高すぎると、簡単に1サーボ系が共振を起
し、磁気ディスク装置の位置決めキャリッジは正確な位
置決めが不可能となる。
If the gain is too high, one servo system will easily resonate, making it impossible for the positioning carriage of the magnetic disk drive to perform accurate positioning.

したがって、この種の位置決めキャリッジは近年のよう
に記録密度、容量の増大に伴い、情報の呼び出し書き込
み時における前記共振周波数およびそのゲインが問題と
なっている。
Therefore, with the increase in recording density and capacity of this type of positioning carriage in recent years, the resonance frequency and its gain when reading and writing information have become a problem.

本発明の目的は回転式アームを有する位置決めキャリッ
ジにおいて、従来のもののこのような欠点を除来し、前
記共振周波数およびゲインを調整し得る位置決めキャリ
ッジを提供するものである。
SUMMARY OF THE INVENTION An object of the present invention is to provide a positioning carriage having a rotary arm, which eliminates the above disadvantages of the conventional positioning carriage and whose resonance frequency and gain can be adjusted.

本発明によれば、磁気ヘッドを設けた回転アームを有す
る回転型の位置決めキャリッジにおいて前記キャリッジ
のアームに質量体を付加したことを特徴とする磁気ディ
スク装置の位置決めキャリッジが得られる。
According to the present invention, there is obtained a positioning carriage for a magnetic disk device, which is a rotary type positioning carriage having a rotating arm provided with a magnetic head, and is characterized in that a mass body is added to the arm of the carriage.

更に本発1j!によれば、特許請求の範囲第1項におい
て、前記アームに付加した質量体は取付位置を調整でき
るようにしたことを特徴とする磁気ディスク装置の位置
決めキャリ、ツジが得られる。
Furthermore, the main departure 1j! According to the first aspect of the present invention, there is provided a positioning carrier for a magnetic disk device, characterized in that the mounting position of the mass body added to the arm can be adjusted.

本発明は、質量を付加することで、回転アームの共振周
波数を下げ、他の要因による共振点(たとえば、ベアリ
ングの振動)によって生じる又共振に、アームの共振点
を合わせ、ゲインを小さくする、即ち、反共振に共振を
合わせ、その共振点のゲインを下げる効果をねらったも
めである。
The present invention lowers the resonant frequency of the rotating arm by adding mass, aligns the resonant point of the arm with the resonance caused by the resonant point caused by other factors (for example, bearing vibration), and reduces the gain. In other words, the aim is to match resonance to anti-resonance and reduce the gain at that resonance point.

以下、本発明の実施例について図面を参照して説明する
Embodiments of the present invention will be described below with reference to the drawings.

第2図は、本発明の一実施例を示す。第2図に幹いて1
本実施例はキャリッジハウジング1に取付けられたキャ
リッジ2と、該中ヤリッジ2を作動させ4リニアモータ
と、キャリッジ2のアーム部2と、該アーム部2′に取
付けられている可動ヘッド7とを有している、更に本実
施例にはアーム部2′に新たに取り付けた質量体10を
有している。
FIG. 2 shows one embodiment of the invention. Figure 2 shows 1
This embodiment includes a carriage 2 attached to a carriage housing 1, a 4-linear motor that operates the intermediate carriage 2, an arm 2 of the carriage 2, and a movable head 7 attached to the arm 2'. Furthermore, this embodiment has a mass body 10 newly attached to the arm portion 2'.

磁気ディスク8は軸9を支点として回転するようになっ
ている。一般に呼び出し、書き込み命令により、キャリ
ッジ2が急速な移動をすると、その加振力のために、ア
ーム部2′及びキャリッジ2内部の図示しない回転軸及
びベアリング、及びコイル5が、ある周波数で共振し、
その共i!によってキャリッジ2が上下、左右方向に振
動し、これによって可動ヘッド7と磁気ディスク8の情
報位置との相互間の位置変化、即ち、オフトラックを生
じる。この可動ヘッド7で生じる振動は、可動ヘッド7
の取付部であるアーム2′の先端の振動特性に左右され
る。この振動のシック方向の特性(加速度)を測定する
と第3図のようになる。
The magnetic disk 8 is configured to rotate about a shaft 9 as a fulcrum. Generally, when the carriage 2 moves rapidly due to a read or write command, the arm part 2', the rotating shaft and bearing (not shown) inside the carriage 2, and the coil 5 resonate at a certain frequency due to the excitation force. ,
That co-i! This causes the carriage 2 to vibrate vertically and horizontally, resulting in a mutual positional change between the movable head 7 and the information position on the magnetic disk 8, that is, off-track. The vibrations generated in the movable head 7 are
It depends on the vibration characteristics of the tip of the arm 2', which is the mounting part of the arm 2'. When the characteristics (acceleration) of this vibration in the sick direction are measured, the result is as shown in FIG.

通常、2に七以上の共振点については、ノツチフィルタ
等のフィルタを用いてゲインを落している。典鵜なノツ
チフィルタの特性を第4図に示す゛。一般に、フィルタ
を用いると、位相がまわることから、各々の共振点に対
してフィルタを用いることは1位相マージンが少なくな
るのでかえって、サーlの追従性が悪くなる。また、共
振点と共振点の間にノツチフィルタを用いて、両方のゲ
インを落そ、うとしても、その共振点のゲインが高いと
、十分に紘落ちない。従って、共振点の数を少なく、ま
たゲインを小さくする必要がある。
Usually, for resonance points of 2 to 7 or more, a filter such as a notch filter is used to reduce the gain. Figure 4 shows the characteristics of a standard notch filter. In general, when a filter is used, the phase rotates, so using a filter for each resonance point reduces the one phase margin, which actually worsens the followability of the circuit. Furthermore, even if a notch filter is used between the two resonance points to reduce the gain at both points, if the gain at the resonance point is high, the gain will not be reduced sufficiently. Therefore, it is necessary to reduce the number of resonance points and the gain.

そこで、本実施例を第3図を用いて説明する。Therefore, this embodiment will be explained using FIG. 3.

共振点a、b、eは、それぞれ、ベアリング、アーム、
コイルによる振動である。ベアリングの剛性は、予圧を
上げてもそれほど高くはならず、かえって寿命、摩擦ト
ルクの問題が出るし、コイルの剛性を上げるためには、
コイルの肉厚を増せば良いが、永久磁石のギャップ(図
示せず)が大きくなり、キャリッジを動作させる力が弱
くなる。
Resonance points a, b, and e are the bearing, arm, and
This is vibration caused by a coil. Even if you increase the preload, the rigidity of the bearing will not increase that much, which will actually cause problems with life and friction torque.In order to increase the rigidity of the coil,
Although it is possible to increase the thickness of the coil, the gap between the permanent magnets (not shown) becomes larger and the force for moving the carriage becomes weaker.

また、アームの剛性を上げると慣性モーメントが大きく
なるため適用が困難である。
Furthermore, increasing the rigidity of the arm increases the moment of inertia, making it difficult to apply.

そこで、本発明は、共振点すのゲインを低くすることを
天的とする。
Therefore, the purpose of the present invention is to lower the gain at the resonance point.

この共振点すの振動キードは、アーム先端のねじれ振動
を示す・この振動モードを第5図に示す。
The vibration key at this resonance point indicates torsional vibration at the tip of the arm. This vibration mode is shown in Figure 5.

この振動モードの節、腹に注目すると、このねじれ振動
に対しては、単に質量を付加しただけでは共振点すは下
がらない。即ち、節の上に質量を付加しても無意味で、
この共振点すを下げるためには、第6図に示すように、
付加する質量m0位蓋を腹の上にのせ、かつその効果を
増すためには。
If we pay attention to the nodes and antinodes of this vibration mode, we can see that simply adding mass does not lower the resonance point for this torsional vibration. In other words, it is meaningless to add mass on top of the node,
In order to lower this resonance point, as shown in Figure 6,
In order to place the lid on the abdomen and increase its effect, the mass to be added is m0.

質量mと中心軸20距離jで生じる曲げ啼−メントml
の大きさを考慮すれば良い。この曲げモーメントmlが
大きいほど、共振点bo屑波数は下がる。
Bending bending ml caused by mass m and center axis 20 distance j
All you have to do is consider the size of . The larger the bending moment ml, the lower the resonance point bo debris wave number.

また、質量mが小さくても、距離jが大きければ共振点
すは下がる。
Furthermore, even if the mass m is small, if the distance j is large, the resonance point S will be lowered.

一方、第3図より共振点aには、夏共振点a′があり、
そのゲインは非常に小さい。この部分に共振点すをもつ
てくるように、前述した曲げモーメントmjを調整する
。その結果、共振点すのゲインは、共振点b“になり、
非常に小さくなる。
On the other hand, from FIG. 3, there is a summer resonance point a' at resonance point a,
Its gain is very small. The above-mentioned bending moment mj is adjusted so as to bring the resonance point to this part. As a result, the gain at the resonance point S becomes the resonance point b'',
becomes very small.

なお、この質量mo位置の調整は、第6図に示すように
質量mをナツト式にめネジを切り、振動特性第3図を調
走しながら質量mの位置を移動させ、最適位置を求め、
質量mを接着剤等で固定すれば良い。
To adjust the position of the mass mo, cut a female thread on the mass m in a nut style as shown in Figure 6, move the position of the mass m while adjusting the vibration characteristics in Figure 3, and find the optimal position. ,
The mass m may be fixed with adhesive or the like.

また、第7図に示すように、付加する質量その□ものを
、ボルト式にしても良いし、アームの両側に質量を付加
しても良い。
Further, as shown in FIG. 7, the added mass itself may be of a bolt type, or the mass may be added to both sides of the arm.

なお、本発明の他の実施例として、第8図がある。即ち
このアームの曲げ振動に対しては、!8図に示すように
、アームの先端に前述の質量を付加する例もある。なお
、この時の曲はモーメントは、質量mの重心位置の回転
半径rと質量mの積となる。
Note that FIG. 8 shows another embodiment of the present invention. In other words, for the bending vibration of this arm,! As shown in Figure 8, there is also an example in which the aforementioned mass is added to the tip of the arm. Note that the moment of the song at this time is the product of the radius of rotation r of the center of gravity of mass m and the mass m.

本発明は、以上説明したように、前記キャリッジのアー
ムに質量体の位置を調整することにより磁気ディスク装
置の磁気ヘッドの位置決め機構におけゐサーボ系の共振
周波数のゲインを低下させサー軍系の制御を容易KL、
蓚実かつ安定な位置決めを行うことが出来る。
As explained above, the present invention reduces the gain of the resonance frequency of the servo system in the positioning mechanism of the magnetic head of a magnetic disk drive by adjusting the position of the mass body on the arm of the carriage. KL, easy to control
Accurate and stable positioning can be performed.

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

第1図(a)、(b)は、従来の磁気ディスク装置位置
決めキャリッジの平面図と正面図、第2図および第5図
−一鮒は、本発明の一実施例を示す平面図、第3図唸、
キャリッジのアームの振動特性の例を示す図、第4図(
a)、(b)は、典型的なノツチフィルタのゲイン及び
位相特性の例を示す図、第6図〜第8図は本発明の他の
実施例を示す図である。 1・・・・・・キャリッジハウジンダ、2・・・・・・
キャリッジ、21・・・・・・キャリッジのアーム部、
2I・・・・・・キャリッジのアーム部の振動モード(
変形後)、3・・・・・・ボイス・コイル・モータ、4
・・・・・・IIL り・・・・・・コイル、6・・・
・・・回転軸、7・・・・・・可動ヘッド、8・・・・
・・磁気ディスク、9・・・・・・軸、10・・・・・
・質量(!ス)。 11・・・・・・取付はネジ、12・・・・・・接着剤
。 (の) 第1図 (a−) 第4図 \ 帥6図 (の) j/1 (b’) 蝮7図 @8図
1(a) and 1(b) are a plan view and a front view of a conventional magnetic disk device positioning carriage, and FIGS. 2 and 5 are plan views and front views showing an embodiment of the present invention. 3 figures groan,
Figure 4 shows an example of the vibration characteristics of the carriage arm (
FIGS. 6a and 8b are diagrams showing examples of gain and phase characteristics of typical notch filters, and FIGS. 6 to 8 are diagrams showing other embodiments of the present invention. 1... Carriage housing 2...
Carriage, 21...Arm part of the carriage,
2I... Vibration mode of the carriage arm (
after deformation), 3...Voice coil motor, 4
・・・・・・IIL ri・・・Coil, 6...
...Rotating axis, 7...Movable head, 8...
...Magnetic disk, 9...Axis, 10...
・Mass (!s). 11...Mounting with screws, 12...Adhesive. (of) Figure 1 (a-) Figure 4 \ Figure 6 (of) j/1 (b') Figure 7 @ Figure 8

Claims (1)

【特許請求の範囲】 1)磁気ヘッドを設けた回転アームを有するu1型の位
置決めキャリッジにおいて、前記キャリッジのアームに
質量体を付加したことを特徴とする磁気ディスク装置の
位置決めキャリッジ。 2、特許請求の範囲第1項において、前記アームに付加
した質量体は取付位置を調整できるようにしたことを特
徴とする磁気ディスク装置の位置決めキャリッジ。
Claims: 1) A positioning carriage for a magnetic disk device, characterized in that a U1 type positioning carriage has a rotating arm provided with a magnetic head, and a mass body is added to the arm of the carriage. 2. The positioning carriage for a magnetic disk device according to claim 1, wherein the mounting position of the mass body added to the arm can be adjusted.
JP1136282A 1982-01-27 1982-01-27 Positioning carriage for magnetic disc Granted JPS58128057A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP1136282A JPS58128057A (en) 1982-01-27 1982-01-27 Positioning carriage for magnetic disc

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP1136282A JPS58128057A (en) 1982-01-27 1982-01-27 Positioning carriage for magnetic disc

Publications (2)

Publication Number Publication Date
JPS58128057A true JPS58128057A (en) 1983-07-30
JPH0546035B2 JPH0546035B2 (en) 1993-07-12

Family

ID=11775910

Family Applications (1)

Application Number Title Priority Date Filing Date
JP1136282A Granted JPS58128057A (en) 1982-01-27 1982-01-27 Positioning carriage for magnetic disc

Country Status (1)

Country Link
JP (1) JPS58128057A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6922305B2 (en) 2002-11-18 2005-07-26 Hitachi Global Storage Technologies Netherlands B.V. Apparatus and method for reducing vibrational excitation in storage devices with dual stage actuators
JP2008016116A (en) * 2006-07-05 2008-01-24 Nhk Spring Co Ltd Disk device

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS54163619U (en) * 1978-05-04 1979-11-16

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS54163619U (en) * 1978-05-04 1979-11-16

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6922305B2 (en) 2002-11-18 2005-07-26 Hitachi Global Storage Technologies Netherlands B.V. Apparatus and method for reducing vibrational excitation in storage devices with dual stage actuators
JP2008016116A (en) * 2006-07-05 2008-01-24 Nhk Spring Co Ltd Disk device
US7835114B2 (en) 2006-07-05 2010-11-16 Nhk Spring Co., Ltd. Disc drive apparatus
JP4709083B2 (en) * 2006-07-05 2011-06-22 日本発條株式会社 Disk unit

Also Published As

Publication number Publication date
JPH0546035B2 (en) 1993-07-12

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