WO2004093076A1 - Hard disk device - Google Patents

Hard disk device Download PDF

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Publication number
WO2004093076A1
WO2004093076A1 PCT/JP2003/013137 JP0313137W WO2004093076A1 WO 2004093076 A1 WO2004093076 A1 WO 2004093076A1 JP 0313137 W JP0313137 W JP 0313137W WO 2004093076 A1 WO2004093076 A1 WO 2004093076A1
Authority
WO
WIPO (PCT)
Prior art keywords
hard disk
head
disk drive
circuit
acceleration sensor
Prior art date
Application number
PCT/JP2003/013137
Other languages
French (fr)
Japanese (ja)
Inventor
Mitsuhiro Yuasa
Original Assignee
Tokyo Electron Limited
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 Tokyo Electron Limited filed Critical Tokyo Electron Limited
Priority to AU2003271190A priority Critical patent/AU2003271190A1/en
Publication of WO2004093076A1 publication Critical patent/WO2004093076A1/en

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Classifications

    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B21/00—Head arrangements not specific to the method of recording or reproducing
    • G11B21/02—Driving or moving of heads
    • G11B21/12—Raising and lowering; Back-spacing or forward-spacing along track; Returning to starting position otherwise than during transducing operation
    • 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
    • G01—MEASURING; TESTING
    • G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
    • G01P15/00—Measuring acceleration; Measuring deceleration; Measuring shock, i.e. sudden change of acceleration
    • G01P15/02—Measuring acceleration; Measuring deceleration; Measuring shock, i.e. sudden change of acceleration by making use of inertia forces using solid seismic masses
    • G01P15/08—Measuring acceleration; Measuring deceleration; Measuring shock, i.e. sudden change of acceleration by making use of inertia forces using solid seismic masses with conversion into electric or magnetic values
    • G01P2015/0805—Measuring acceleration; Measuring deceleration; Measuring shock, i.e. sudden change of acceleration by making use of inertia forces using solid seismic masses with conversion into electric or magnetic values being provided with a particular type of spring-mass-system for defining the displacement of a seismic mass due to an external acceleration
    • G01P2015/0822—Measuring acceleration; Measuring deceleration; Measuring shock, i.e. sudden change of acceleration by making use of inertia forces using solid seismic masses with conversion into electric or magnetic values being provided with a particular type of spring-mass-system for defining the displacement of a seismic mass due to an external acceleration for defining out-of-plane movement of the mass
    • G01P2015/084—Measuring acceleration; Measuring deceleration; Measuring shock, i.e. sudden change of acceleration by making use of inertia forces using solid seismic masses with conversion into electric or magnetic values being provided with a particular type of spring-mass-system for defining the displacement of a seismic mass due to an external acceleration for defining out-of-plane movement of the mass the mass being suspended at more than one of its sides, e.g. membrane-type suspension, so as to permit multi-axis movement of the mass

Definitions

  • the present invention relates to a hard disk drive, and more particularly to a hard disk drive that prevents a collision between a head and a platter due to a drop impact.
  • Hard disk drives are an important element as storage devices for personal computers. The development of higher magnetic densities has resulted in smaller and thinner hard disks, which has recently become portable. Recently, a removable hard disk device disk has appeared (Japanese Patent Application Laid-Open No. 2002-3667362).
  • Removable hard disks have larger capacities than other removable media, a higher data transfer rate, comfortable backup, and comfortable temporary storage, so they can be used in various fields. Its usefulness and convenience have been recognized.
  • Such a hard disk drive is miniaturized and, for example, is carried as a music player, so unlike a fixed type hard disk drive, it is expected that the hard disk drive will be dropped from the hand.
  • the head will not collide with the plaque when not reading or writing, since the head is retracted to the shipyard.
  • the impact on the hard disk drive device due to the fall causes the head to collide with the platter, causing the magnetic layer on the surface of the blitter and the head to be destroyed.
  • the collision point, but also the fragments generated at that time rotate at high speed It can collide with other areas of the platter and repeat blasting, causing the entire area of the disk to become unusable, a so-called head crash problem.
  • Japanese Patent Application Laid-Open No. 2-444858 discloses that a sensor for detecting head vibration is provided inside a head assembly of a hard disk drive, and a detection signal of the sensor is provided. Indicates that the operation of the head assembly is stopped.
  • Japanese Patent Application Laid-Open No. 8-315,988 discloses that a collision is detected by a three-axis acceleration sensor, and when the value detected by this detector is equal to or more than a specified value, the spindle motor is detected. There is disclosed an apparatus in which the number of revolutions is rotated at a higher speed than the steady-state rotation, the head floats, and the head is retracted to the sibbing zone (position B in the figure). The technique disclosed in the above-mentioned Japanese Patent Application Laid-Open No. Hei 8-313540 is designed to rotate the spindle motor at a speed higher than the steady speed when the value detected by the detector is equal to or greater than a specified value.
  • the head is lifted up, the head is lifted up, and the ship is evacuated to the ship zone.In other words, it performs post-impact processing.
  • the removable hard disk device has recently begun to be used as a storage device for a portable music player.
  • data is always read, processed, and played back. This means that the head remains on the platter for a long time.
  • the present invention is configured to predict a collision in advance and to evacuate the head in advance with respect to a head crash due to a fall, thereby preventing a crash due to a fall. Trying to do so.
  • the present invention provides a hard disk drive with a built-in head collision prevention circuit and a configuration for issuing a head retreat instruction when a drop state is detected. That is, the present invention includes a head collision prevention circuit for detecting acceleration and generating a signal for retreating the head when the speed exceeds a certain value, and the head is moved to the ship zone by the signal.
  • a hard disk drive device characterized by being configured to evacuate.
  • the present invention provides a head collision prevention circuit, wherein the head collision prevention circuit is connected to an acceleration sensor, the acceleration sensor, and a speed calculation circuit that calculates a speed based on an output from the sensor.
  • a critical speed discriminating circuit that compares the calculated speed with a predetermined critical speed, and generates an alarm signal when the calculated speed exceeds the critical speed.
  • the present invention is the hard disk drive according to claim 2, wherein the head collision prevention circuit is formed of one chip.
  • the present invention is the hard disk drive according to claim 2, wherein at least a part of the head collision prevention circuit excluding the acceleration sensor and the acceleration sensor are formed of one chip.
  • the present invention is the hard disk drive according to claim 2, wherein the acceleration sensor is a three-axis acceleration sensor.
  • the three-axis acceleration sensor may be a piezoresistive three-axis acceleration sensor. 6.
  • the present invention is the hard disk device according to claim 2 or 3, wherein the head collision prevention circuit is provided on a substrate of the hard disk device.
  • the present invention is the hard disk device according to claim 2, wherein the head collision prevention circuit is integrated with a hard disk drive circuit as an IC.
  • the head can be evacuated before a collision, so that a head crash of the hard disk can be prevented. Can be prevented. Therefore, there is no need to retract the head while floating the head by rotating the spindle motor at high speed unlike the prior art, and the control is simple.
  • FIG. 1 is a block diagram of a head collision prevention circuit of the present invention.
  • FIG. 2 is a flowchart showing an embodiment of the present invention.
  • FIG. 3 is a perspective view showing a basic configuration of the piezoresistive three-axis acceleration sensor 2.
  • FIG. 4 is a cross section (1) of the sensor 2 taken along a cutting line AA ′ in FIG.
  • FIG. 5 is a cross-sectional view illustrating deformation of the sensor 2 when acceleration is applied in the X-axis or y-axis direction in FIG.
  • FIG. 6 is a cross-sectional view showing deformation of the sensor 2 when acceleration is applied in the z-axis direction in FIG.
  • Fig. 7 is a schematic view of a conventional removable hard disk 11 device. It is.
  • FIG. 8 is a front view showing the inside of the cartridge 12 with the top cover of the disk cartridge of the apparatus shown in FIG. 7 removed.
  • FIG. 9 is a block diagram of an electric circuit configuration of the apparatus shown in FIG. Embodiment of the Invention
  • FIG. 7 is a diagram described in Patent Document 1 below, and particularly shows a state in which the disk cartridge 12 is removed from the removable hard disk 13.
  • the disc cartridge 12 includes a chassis 14, a top cover 15, and a coil force par 16.
  • the removable purple hard disk 13 includes a circuit board 16, a connector 17 with the cartridge 12, a magnetic circuit 18 for driving a head arm actuator, and the like.
  • FIG. 8 shows a state where the top force par 15 of the disc cartridge 12 has been removed.
  • the disk 19 in the center called blutter, is made of a metal disk and is coated with a magnetic material.
  • the storage is performed by changing the magnetization state of the magnetic material on the blitter by the head 21 at the tip of the head arm actuator 20, or: from the head 21 Information is read by detecting the magnetization state.
  • the movement of the head arm actuator 20 is controlled by a voice coil motor driving movable coil 22 and the magnetic circuit 18.
  • the head arm actuator 20 indicated by a broken line is retracted to a ship yard which is a non-operating area.
  • Fig. 9 shows the electrical circuit configuration of the removable hard disk drive. It is a block diagram.
  • the circuit board 16 mounted on the removable hard disk 13 includes an interface circuit 201, a head-to-muffler actuator drive control circuit 203, and a position control circuit 205. And a disk rotation control circuit 207 and a data processing circuit 209.
  • the head arm actuator drive control circuit 203 supplies a drive signal to the movable coil 22 of the Pois-coil motor based on the position control signal from the position control circuit 205, and Drives the actuator 20.
  • the acceleration applied to the hard disk device built in the player becomes a gravitational acceleration g, but this state continues until the player collides with the ground. Accordingly, when the acceleration applied to the hard disk device is the gravitational acceleration g for a predetermined time or more, it is considered that the hard disk device is falling.
  • the acceleration when the acceleration is detected, and the hard disk device falls according to gravity and detects that the speed exceeds a certain value, it is determined that the device is falling, and the A signal to the effect is sent to the head actuator control circuit so that the head is evacuated to the shipyard.
  • FIG. 1 is a block diagram showing the configuration of the present invention.
  • the head collision prevention circuit 1 detects the acceleration, and based on this acceleration, Calculates the speed and generates a signal to retreat the head when the speed exceeds a certain value.In response to the signal, the head arm actuator drive control circuit ships the head. Evacuate in the zone.
  • Such a head collision prevention circuit 1 includes an acceleration sensor 2, a speed calculation circuit 3 connected thereto, and a critical speed discrimination circuit 4 connected to the speed calculation circuit 3.
  • the head collision prevention circuit 1 is composed of one chip to reduce the mounting area and weight.
  • a movable body such as a disk cartridge chassis or a head arm actuator It is placed on an appropriate position near the shipboard that does not hinder the operation of the above, or on the circuit board of the removable hard disk 16 described below. It can also be integrated with the hard disk drive circuit. Alternatively, it can be created as an IC integrated with a hard disk drive circuit.
  • the head collision prevention circuit 1 is formed as a single chip
  • a part of the head collision prevention circuit excluding the acceleration sensor and the acceleration sensor 2 may be formed as one chip, or the head collision prevention circuit 1 may be formed as a single chip.
  • the acceleration sensor 2, the speed calculation circuit 3, and the critical speed discrimination circuit 4 that constitute the prevention circuit 1 may be created as individual devices.
  • each functional element may be mounted on the same die, or may be formed into one chip by a package.
  • a part of the function of the head collision prevention circuit may be assigned to another device mounted on the hard disk device and / or an external device capable of communicating with the hard disk device.
  • FIG. 3 is a perspective view of the piezoresistive element type three-axis acceleration sensor 2.
  • the sensor 2 may, for example, 5 mm X 5 mm X l . Intended for housing the piezoelectric element to zero Kke the di size of 2 mm, using the resistance change of the element, in one chip, X yz The three axes of acceleration are simultaneously detected.
  • the shape of the sensor 2 is connected to the central rectangular portion 6, the side 7 of even connexion surrounds four sides of this and space, and said central rectangular portion 6 and the central part 7 7 2 ⁇ ⁇ • each four sides
  • the connecting part consists of 8 t 8 2 .
  • the piezo element 9 is formed on the upper surface of the connecting portion 8.
  • AA represents a cutting line for cutting the center of the sensor 2 in the X-axis direction.
  • FIG. 4 is a cross-sectional view taken along a cutting line AA ′ in FIG. Pi E zone resistive element 9, the connecting portions 8 i 8 2, ing is formed on ⁇ ⁇ ⁇ above.
  • the central rectangular portion 6 has a weight 10 projecting downward.
  • FIG. 5 is a schematic diagram showing deformation of the sensor when a force is applied in a two-dimensional xy direction on the surface of the sensor.
  • FIG. 6 is a schematic diagram showing deformation of the sensor 2 when a force is applied in the z-axis direction perpendicular to the surface of the sensor 2.
  • a bridge circuit (not shown) including four sets of the piezoresistive elements 9, an unbalanced voltage is detected, and the acceleration is thereby detected.
  • Such a three-axis acceleration sensor 2 can detect the dynamic acceleration of the X-axis, y-axis, and z-axis.Using this output, the inclination at rest and the gravitational acceleration that is the static acceleration can be calculated. Is possible. As described above, signals representing the respective accelerations in the x, y, and z-axis directions are generated from the three-axis acceleration sensor 2, and the acceleration ⁇ is calculated based on these signals. Supplied to The speed calculation circuit 3 is a circuit for calculating the speed V from the acceleration ⁇ when the acceleration ⁇ is equal to the gravitational acceleration g, and is calculated by a known calculation method. The critical speed discrimination circuit 4 compares the speed V received from the speed calculation circuit 3 with the critical speed Vc, and generates an alarm signal AL indicating a falling state when V ⁇ Vc.
  • the alarm signal AL is supplied to the head actuator drive control circuit 203 as a signal to retreat the head to the shipyard.
  • the head arm actuator control circuit 203 controls the head arm to retreat to the sibbing zone.
  • the flow of the drop detection process is a process flow that starts at a predetermined time interval.
  • acceleration signals in the X, y, and z-axis directions are detected from the three-axis acceleration sensor 2 (Step 1).
  • the acceleration of the device is calculated based on the acceleration signal (step 2).
  • the acceleration ⁇ is compared with the gravitational acceleration g (step 3), and the directions match, and when the direction is g (in the case of n0), the processing shifts to the main processing ( Step 9).
  • Step 4 the time during which this state continues is measured, and the velocity V is calculated using the time (step 4).
  • the speed V is compared with the critical speed Vc, which is the speed at which the device can be considered to be falling.
  • Vc the critical speed at which the device can be considered to be falling.
  • Step 5 If V ⁇ Vc, it is determined that the hard disk drive is falling, and an alarm signal AL is generated (Step 6).
  • the head arm actuator drive control circuit 203 controls the head arm to retreat to the shiving zone (step 7). After that, all the processing ends (Step 8).
  • step 5 If it is determined in step 5 that V is less than Vc, the process returns to step 1.
  • This processing can be realized by using a microprocessor or by using individual function circuits.
  • This flow is an example, and the present invention is not limited to this flow.
  • the head should not be evacuated when falling for a short time, such as when going down stairs. Instead of step 8, it is possible to return to the main processing after a certain time has passed. Also, it is clear that the idea of the present invention can be applied not only to music reproduction but also to writing to a music player.
  • a three-axis acceleration sensor can be applied to a fixed type hard disk device to prevent a head crash caused by a drop.

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  • Moving Of Head For Track Selection And Changing (AREA)

Abstract

A hard disk device, comprising a mechanism that incorporates an accelerator sensor to retract a head when a dropped state is detected by the sensor, whereby the hard disk device can be prevented from being crashed by dropping by predicting drop and impact beforehand. More specifically, a hard disk device comprising an acceleration sensor and a control device for controlling the head to retract to a ship zone when a speed detected by the sensor exceeds a specified value, wherein the head of the hard disk device is formed so as to be retracted to the shipping zone before the hard disk device receives an impact by dropping.

Description

明 細 書 ハー ドディスク装置 技術の分野 '  Description Hard Disk Drive Technology Field ''
本発明は、 ハー ドディスク装置、 特に落下衝撃によるへッ ドとプ ラッタの衝突を予防するハー ドディスク装置に関する。 背景技術  The present invention relates to a hard disk drive, and more particularly to a hard disk drive that prevents a collision between a head and a platter due to a drop impact. Background art
ハー ドディスク装置は、 パソコンの記憶装置と して重要な要素で あり、 磁気密度の高密度化について開発が進められて来た結果、 小 型化、 薄型化が進み、 最近になって携帯可能な、 リムーパブルハー ドディスク装置ディスクが出現した （特開 2 0 0 2 - 3 6 7 3 6 2 号） 。  Hard disk drives are an important element as storage devices for personal computers.The development of higher magnetic densities has resulted in smaller and thinner hard disks, which has recently become portable. Recently, a removable hard disk device disk has appeared (Japanese Patent Application Laid-Open No. 2002-3667362).
リ ムーパブルハードディスクは、 他のリ ムーパブルメディアと比 ぺると容量が大きく、 データ転送レートも高く、 又、 パックアップ が快適にでき、 テンポラリのス ト レージも快適にできるので、 様々 な分野で、 その有用性、 利便性が認められてきている。  Removable hard disks have larger capacities than other removable media, a higher data transfer rate, comfortable backup, and comfortable temporary storage, so they can be used in various fields. Its usefulness and convenience have been recognized.
このよ うなハー ドディスク装置は、 小型化され、 例えば、 音楽プ レーャと して持ち蓮びされるので、 固定タイプのハー ドディスク装 置とは異なり、 手元から落とすケースが予想される。 該ハー ドディ スク装置を落と した場合、 読み書きをしていない状態では、 ヘッ ド はシップヤードに退避しているため、 へッ ドがプラックに衝突する ことは無い。 しかし、 読み書きしている場合は、 落下によるハー ド ディスク ドライブ装置への衝撃によ り、 へッ ドがブラッタに衝突し 、 ブラ ッタ表面の磁性層及び、 へッ ドの破壊を引き起こす。 さ らに 、 衝突個所だけでなく、 更に、 その際発生した破片が高速回転して いるブラッタの他の領域に衝突し、 破壌を繰り返し、 ディスクの全 領域が使えなく なるという、 所謂へッ ドクラッシュという問題を引 き起こす可能性がある。 Such a hard disk drive is miniaturized and, for example, is carried as a music player, so unlike a fixed type hard disk drive, it is expected that the hard disk drive will be dropped from the hand. When the hard disk drive is dropped, the head will not collide with the plaque when not reading or writing, since the head is retracted to the shipyard. However, when reading and writing, the impact on the hard disk drive device due to the fall causes the head to collide with the platter, causing the magnetic layer on the surface of the blitter and the head to be destroyed. Furthermore, not only the collision point, but also the fragments generated at that time rotate at high speed It can collide with other areas of the platter and repeat blasting, causing the entire area of the disk to become unusable, a so-called head crash problem.
この種の問題に対し、 特開平 2— 4 4 4 5 8号公報には、 ハ ー ド ディスク装置のへッ ドアセンブリの内部にへッ ドの振動を感知する センサを備え、 センサの検知信号でへッ ドアセンブリ の動作を停止 するものが示されている。  In order to solve this kind of problem, Japanese Patent Application Laid-Open No. 2-444858 discloses that a sensor for detecting head vibration is provided inside a head assembly of a hard disk drive, and a detection signal of the sensor is provided. Indicates that the operation of the head assembly is stopped.
また、 特開平 8— 3 1 5 4 9 8号公報には、 衝擊を 3軸加速度セ ンサで検出し、 この検出器によ り検出された値が規定値以上である ときに、 スピン ドルモータの回転数を定常回転よ り高速に回転させ 、 ヘッ ドを浮上させ、 シッビングゾーンに退避させる （図における Bの位置） ものが開示されている。 前記特開平 8— 3 1 5 4 9 8号 公報に開示される技術は、 検出器によ り検出された値が規定値以上 であるときに、 スピンドルモータの回転数を定常回転より高速に回 転させて、 へッ ドを浮上させてシップゾーンに退避するものであり 、 いわば衝撃後の処理を行う ものであって、 装置の落下に対し、 衝 突を予測し、 へッ ドクラッシュを未然に防止するものではなかった 前記したよ う に、 リ ムーパブル · ハー ドディスク装置は、 最近、 携帯音楽プレーヤ用の記憶装置と して使用され始めているが、 この ような携帯音楽プレーヤは、 パソコンと異なり、 使用時には常時、 データを読み込み、 処理を行って、 演奏再生を行っている。 これは 、 ヘッ ドがブラッタ上に位置する状態が長く続く ことを意味してい る。  Also, Japanese Patent Application Laid-Open No. 8-315,988 discloses that a collision is detected by a three-axis acceleration sensor, and when the value detected by this detector is equal to or more than a specified value, the spindle motor is detected. There is disclosed an apparatus in which the number of revolutions is rotated at a higher speed than the steady-state rotation, the head floats, and the head is retracted to the sibbing zone (position B in the figure). The technique disclosed in the above-mentioned Japanese Patent Application Laid-Open No. Hei 8-313540 is designed to rotate the spindle motor at a speed higher than the steady speed when the value detected by the detector is equal to or greater than a specified value. The head is lifted up, the head is lifted up, and the ship is evacuated to the ship zone.In other words, it performs post-impact processing. As described above, the removable hard disk device has recently begun to be used as a storage device for a portable music player. In contrast, during use, data is always read, processed, and played back. This means that the head remains on the platter for a long time.
このために、 このような携帯プレーヤ装置においては、 落下対策 は極めて重要な課題である。 発明の開示 For this reason, in such a portable player device, countermeasures against falling are an extremely important issue. Disclosure of the invention
本発明は、 このような課題に対して、 特に落下によるヘッ ドクラ ッシュに対し、 衝擊を事前に予測して、 予めヘッ ドを退避するよ う に構成し、 落下によるクラッシュを未然に防止しよ う とするもので ある。  In order to prevent such a problem, the present invention is configured to predict a collision in advance and to evacuate the head in advance with respect to a head crash due to a fall, thereby preventing a crash due to a fall. Trying to do so.
このために、 本発明は、 ハー ドディスク装置において、 ヘッ ド衝 突防止回路を内蔵し、 落下状態を検出した場合に、 ヘッ ド退避命令 を発行する構成を設けるものである。 即ち、 本発明は、 加速度を検 出し、 速度が一定値を超えたときへッ ドを退避する信号を生成する へッ ド衝突防止回路を備え、 前記信号によ りへッ ドをシップゾーン に退避するよう構成されてなることを特徴とするハ ー ドディスク ド ライブ装置である。  For this reason, the present invention provides a hard disk drive with a built-in head collision prevention circuit and a configuration for issuing a head retreat instruction when a drop state is detected. That is, the present invention includes a head collision prevention circuit for detecting acceleration and generating a signal for retreating the head when the speed exceeds a certain value, and the head is moved to the ship zone by the signal. A hard disk drive device characterized by being configured to evacuate.
又、 本発明は、 前記ヘッ ド衝突防止回路が、 加速度センサと、 前 記加速度センサに接続され、 該センサからの出力に基づいて速度を 計算する速度計算回路と、 前記速度計算回路に接続し、 前記計算さ れた速度と、 予め定められた臨界速度とを比較し、 前記計算された 速度が前記臨界速度を上回る場合にアラーム信号を生成する臨界速 度判別回路とからなることを特徴とする請求項 1記載のハー ドディ スク装置である。  Also, the present invention provides a head collision prevention circuit, wherein the head collision prevention circuit is connected to an acceleration sensor, the acceleration sensor, and a speed calculation circuit that calculates a speed based on an output from the sensor. A critical speed discriminating circuit that compares the calculated speed with a predetermined critical speed, and generates an alarm signal when the calculated speed exceeds the critical speed. The hard disk device according to claim 1, wherein
更に、 本発明は、 前記ヘッ ド衝突防止回路が 1チップからなるこ とを特徴とする請求項 2記載のハ ー ドディスク装置である。  Further, the present invention is the hard disk drive according to claim 2, wherein the head collision prevention circuit is formed of one chip.
更に、 本発明は、 前記加速度センサを除く前記ヘッ ド衝突防止回 路の少なく とも一部と加速度センサとが 1チップからなることを特 徴とする請求項 2記載のハー ドディスク装置である。  Further, the present invention is the hard disk drive according to claim 2, wherein at least a part of the head collision prevention circuit excluding the acceleration sensor and the acceleration sensor are formed of one chip.
更に、 本発明は、 前記加速度センサが 3軸加速度センサであるこ とを特徴とする請求項 2記載のハ ー ドディスク装置である。  Further, the present invention is the hard disk drive according to claim 2, wherein the acceleration sensor is a three-axis acceleration sensor.
更に、 本発明は、 前記 3軸加速度センサがピエゾ抵抗型 3軸加速 度センサであることを特徴とする請求項 5記載のハードディスク装 置である。 Further, in the present invention, the three-axis acceleration sensor may be a piezoresistive three-axis acceleration sensor. 6. The hard disk drive according to claim 5, wherein the hard disk drive is a degree sensor.
更に、 本発明は、 前記ヘッ ド衝突防止回路がハードディスク装置 の基板に载置されることを特徴とする請求項 2又は 3記載のハー ド ディスク装置である。  Further, the present invention is the hard disk device according to claim 2 or 3, wherein the head collision prevention circuit is provided on a substrate of the hard disk device.
更に、 本発明は、 前記へッ ド衝突防止回路がハ ー ドディスク ドラ ィブ回路と一体的に I C化されてなることを特徴とする請求項 2記 載のハー ドディスク装置である。  Further, the present invention is the hard disk device according to claim 2, wherein the head collision prevention circuit is integrated with a hard disk drive circuit as an IC.
本発明によれば、 データの読み書き中にハー ドディスク装置を落 と しても、 衝突前にへッ ドを退避させることが可能となるので、 ハ 一ドディスクのへッ ドクラッシュを未然に防止することができる。 従って、 従来技術のようにスピンドルモータを高速回転させへッ ド を浮上させながら退避する必要は無く、 制御も簡単である。 図面の簡単な説明  According to the present invention, even if the hard disk drive is dropped while reading or writing data, the head can be evacuated before a collision, so that a head crash of the hard disk can be prevented. Can be prevented. Therefore, there is no need to retract the head while floating the head by rotating the spindle motor at high speed unlike the prior art, and the control is simple. BRIEF DESCRIPTION OF THE FIGURES
本発明を添付する図面を参照しながら以下に説明する。 The present invention will be described below with reference to the accompanying drawings.
第 1図は、 本発明のへッ ド衝突防止回路のブロ ック図である 第 2図は、 本発明の実施態様を示すフローチャートである。  FIG. 1 is a block diagram of a head collision prevention circuit of the present invention. FIG. 2 is a flowchart showing an embodiment of the present invention.
第 3図は、 ピエゾ抵抗型 3軸加速度センサ 2の基本構成を示す斜 視図である。  FIG. 3 is a perspective view showing a basic configuration of the piezoresistive three-axis acceleration sensor 2.
第 4図は、 第 3図において、 切新線 A A ' に沿って切り取ったセ ンサ 2の断面 (1である。  FIG. 4 is a cross section (1) of the sensor 2 taken along a cutting line AA ′ in FIG.
第 5図は、 第 4図において X軸、 又は y軸方向に加速度が加わつ た時のセンサ 2の変形を表す断面図である。  FIG. 5 is a cross-sectional view illustrating deformation of the sensor 2 when acceleration is applied in the X-axis or y-axis direction in FIG.
第 6図は、 第 4図において z軸方向に加速度が加わった時のセン サ 2の変形を表す断面図である。  FIG. 6 is a cross-sectional view showing deformation of the sensor 2 when acceleration is applied in the z-axis direction in FIG.
第 7図は、 従来のリ ムーバブルハー ドディスク 1 1装置の概観図 である。 Fig. 7 is a schematic view of a conventional removable hard disk 11 device. It is.
第 8図は、 第 7図の装置のディスクカー ト リ ッジの トップカバー を取り外した、 該カー ト リ ッジ 1 2の内部を示す正面図である。 第 9図は、 第 7図の装置の電気回路構成のブロ ック図である。 発明の実施の形態  FIG. 8 is a front view showing the inside of the cartridge 12 with the top cover of the disk cartridge of the apparatus shown in FIG. 7 removed. FIG. 9 is a block diagram of an electric circuit configuration of the apparatus shown in FIG. Embodiment of the Invention
以下、 図面を用いて本発明の実施の態様を説明する前に、 リ ムー バブルハ ー ドディスク装置について説明する。  Hereinafter, before describing embodiments of the present invention with reference to the drawings, a removable hard disk device will be described.
このようなリ ムーバブルハー ドディスク装置 5の概観を図 7に示 す。 図 7は、 下記特許文献 1 に記載された図であって、 特に、 ディ スクカー ト リ ッジ 1 2がリムーパブルハー ドディスク 1 3力、ら取り 出され状態を示す図である。 ディスクカー ト リ ッジ 1 2は、 シヤー シ 1 4 と ト ップカバー 1 5、 コイル力パー 1 6等を備えてなる。 又、 リ ムーパプルハードディスク 1 3は、 回路基板 1 6、 カー ト リ ッジ 1 2 とのコネクタ 1 7、 へッ ドアームァクチユエータ駆動用 の磁気回路 1 8等を備えてなる。  An overview of such a removable hard disk drive 5 is shown in FIG. FIG. 7 is a diagram described in Patent Document 1 below, and particularly shows a state in which the disk cartridge 12 is removed from the removable hard disk 13. The disc cartridge 12 includes a chassis 14, a top cover 15, and a coil force par 16. Further, the removable purple hard disk 13 includes a circuit board 16, a connector 17 with the cartridge 12, a magnetic circuit 18 for driving a head arm actuator, and the like.
図 8は、 前記ディスクカー ト リ ッジ 1 2の ト ップ力パー 1 5を取 り外した状態を示す。 中央部の円盤 1 9は、 ブラッタと呼ばれ、 金 属製のディスクからなり、'磁性体が塗布されている。 前記ブラッタ 上の磁性体の磁化状態を、 へッ ドアームァクチユエータ 2 0の先端 にあるヘッ ド 2 1 によ り、 変化させることによ り記憶を行い、 又は ： ヘッ ド 2 1から磁化状態を検出することによ り情報の読み出しを 行なっている。 ヘッ ドアームァクチユエータ 2 0は、 ボイスコイル モータ駆動用可動コイル 2 2 と前記磁気回路 1 8によ り移動制御さ れる。 なお図において、 破線で示すヘッ ドアームァクチユエータ 2 0は、 非動作領域であるシップヤー ドに退避している。  FIG. 8 shows a state where the top force par 15 of the disc cartridge 12 has been removed. The disk 19 in the center, called blutter, is made of a metal disk and is coated with a magnetic material. The storage is performed by changing the magnetization state of the magnetic material on the blitter by the head 21 at the tip of the head arm actuator 20, or: from the head 21 Information is read by detecting the magnetization state. The movement of the head arm actuator 20 is controlled by a voice coil motor driving movable coil 22 and the magnetic circuit 18. In the figure, the head arm actuator 20 indicated by a broken line is retracted to a ship yard which is a non-operating area.
図 9は、 前記リ ムーパブルハー ドディスク装置の電気回路構成の ブロ ック図である。 図 9に示すよ うに、 リ ムーパブルハー ドデイ ス クー 1 3に搭載した回路基板 1 6には、 インタフェース回路 2 0 1 と、 へッ ドア一ムァクチユエータ駆動制御回路 2 0 3 と、 位置制御 回路 2 0 5 と、 ディスク回転制御回路 2 0 7 と、 データ処理回路 2 0 9が組み込まれている。 へッ ドアームァクチユエータ駆動制御回 路 2 0 3は、 位置制御回路 2 0 5からの位置制御信号に基づいてポ イ スコィルモータの可動コイル 2 2へ駆動信号を供給してへッ ドア 一ムァクチユエータ 2 0を駆動する。 Fig. 9 shows the electrical circuit configuration of the removable hard disk drive. It is a block diagram. As shown in FIG. 9, the circuit board 16 mounted on the removable hard disk 13 includes an interface circuit 201, a head-to-muffler actuator drive control circuit 203, and a position control circuit 205. And a disk rotation control circuit 207 and a data processing circuit 209. The head arm actuator drive control circuit 203 supplies a drive signal to the movable coil 22 of the Pois-coil motor based on the position control signal from the position control circuit 205, and Drives the actuator 20.
次に、 本発明の考え方を、 携帯音楽プレーヤを例にとって説明す る。  Next, the concept of the present invention will be described using a portable music player as an example.
携帯音楽プレーヤが落下する場合、 該プレーヤに内蔵されるハー ドディスク装置に加わる加速度は、 重力加速度 g となるが、 この状 態は該プレーヤが地面に衝突するまで継続する。 従って、 逆に、 ハ ー ドディスク装置に加わる加速度が重力加速度 gである状態が所定 時間以上継続する場合は、 ハー ドディスク装置が落下しているとい える。  When the portable music player falls, the acceleration applied to the hard disk device built in the player becomes a gravitational acceleration g, but this state continues until the player collides with the ground. Accordingly, when the acceleration applied to the hard disk device is the gravitational acceleration g for a predetermined time or more, it is considered that the hard disk device is falling.
ハー ドディスク装置に加わる加速度が重力加速度 g となり、 その 状態が所定時間継続し、 従って速度がある臨界値を越える場合は、 落下していると判断し、 へッ ドアームをシップヤー ドに退避するよ うに制御しなければならない。  If the acceleration applied to the hard disk drive becomes the gravitational acceleration g and this state continues for a predetermined period of time and the speed exceeds a certain critical value, it is determined that the vehicle is falling and the head arm is evacuated to the shipyard. Control.
そこで本発明においては、 加速度を検出し、 ハー ドディスク装置 が重力に従って落下して、 その速度が一定値を超えたことを検知す ると、 本装置が落下していると判断して、 その旨の信号をヘッ ドァ ームァクチユエータ制御回路に送り、 へッ ドをシップヤー ドに退避 させるようにする。  Thus, in the present invention, when the acceleration is detected, and the hard disk device falls according to gravity and detects that the speed exceeds a certain value, it is determined that the device is falling, and the A signal to the effect is sent to the head actuator control circuit so that the head is evacuated to the shipyard.
図 1 は、 本発明の構成を示すブロ ック図である。 図 1 において、 ヘッ ド衝突防止回路 1 は、 加速度を検出し、 この加速度に基づいて 速度を計算し、 速度が一定値を超えたときへッ ドを退避する信号を 生成するものであり、 前記信号を受けてへッ ドアームァクチユエ一 タ駆動制御回路は、 ヘッ ドをシップゾーンに退避するものである。 FIG. 1 is a block diagram showing the configuration of the present invention. In FIG. 1, the head collision prevention circuit 1 detects the acceleration, and based on this acceleration, Calculates the speed and generates a signal to retreat the head when the speed exceeds a certain value.In response to the signal, the head arm actuator drive control circuit ships the head. Evacuate in the zone.
このよ うなへッ ド衝突防止回路 1 は.， 加速度センサ 2 と、 これに 接続する速度計算回路 3 と、 更に該速度計算回路 3に接続する臨界 速度判別回路 4を備えてなる。  Such a head collision prevention circuit 1 includes an acceleration sensor 2, a speed calculation circuit 3 connected thereto, and a critical speed discrimination circuit 4 connected to the speed calculation circuit 3.
へッ ド衝突防止回路 1 は、 実装面積、 重量を削減する為に 1チッ プで構成し、 例えば、 ディスクカー ト リ ッジのシャーシ、 又は、 へ ッ ドアームァクチユエータ等の可動体の動作を阻害しないシップャ 一 ド付近の適当な位置、 又は下記説明するリ ムーバブルハー ドディ スク 1 6の回路基板に载置される。 また、 ハー ドディスク ドライブ 回路と一体に I C化することもできる。 又は、 ハー ドディスク ドラ ィブ回路と一体化した I Cと して作成することも出来る。  The head collision prevention circuit 1 is composed of one chip to reduce the mounting area and weight.For example, a movable body such as a disk cartridge chassis or a head arm actuator It is placed on an appropriate position near the shipboard that does not hinder the operation of the above, or on the circuit board of the removable hard disk 16 described below. It can also be integrated with the hard disk drive circuit. Alternatively, it can be created as an IC integrated with a hard disk drive circuit.
へッ ド衝突防止回路 1 が 1チップ化されている例を説明したが、 加速度センサを除くへッ ド衝突防止回路の一部と前記加速度センサ 2 とを 1チップとしてもよいし、 ヘッ ド衝突防止回路 1 を構成する 加速度センサ 2、 速度計算回路 3、 臨界速度判別回路 4を個別のデ パイスとして作成してもよい。 又、 1チップ化の方法と して、 同一 ダイ上に各機能要素搭載してもよいし、 パッケージで 1チップ化し てもよい。 更に、 ハー ドディスク装置に搭載された他のデバイス及 び/又はハー ドディスク装置と通信可能な外部のデパイスにへッ ド 衝突防止回路の機能の一部を負わせてもよい。  Although the example in which the head collision prevention circuit 1 is formed as a single chip has been described, a part of the head collision prevention circuit excluding the acceleration sensor and the acceleration sensor 2 may be formed as one chip, or the head collision prevention circuit 1 may be formed as a single chip. The acceleration sensor 2, the speed calculation circuit 3, and the critical speed discrimination circuit 4 that constitute the prevention circuit 1 may be created as individual devices. In addition, as a method of forming into one chip, each functional element may be mounted on the same die, or may be formed into one chip by a package. Furthermore, a part of the function of the head collision prevention circuit may be assigned to another device mounted on the hard disk device and / or an external device capable of communicating with the hard disk device.
次に、 本発明のへッ ド衝突防止回路の主要な構成要素である加速 度センサ 2について説明する。 最新の加速度センサと して、 1チッ プで 3軸の加速度を同時に検出を行う ものが出現し、 ゲーム機、 携 帯電話、 カメラ、 自動車等様々の分野で使用されているが、 これを 例にとって説明する。 図 3は、 ピエゾ抵抗素子型 3軸加速度センサ 2の斜視図を示す。 該センサ 2は、 例えば、 5 mm X 5 mm X l . 2 mmの大きさの 0ッケー ジ内にピエゾ電気素子を収納するもので、 該素子の抵抗変化を利用 し、 1チップで、 X y zの 3軸の加速度を同時に検出を行う も のである。 該センサ 2の形状は、 中央矩形部 6 と、 これと空間をも つて囲む 4辺からなる側部 7 と、 各 4辺の中央部 7 7 2 · · • と前記中央矩形部 6 とを連結する連結部 8 t 8 2 、 · · · から なる。 ピエゾ素子 9は、 この連結部 8の上面に形成される。 なお、 A A， は、 前記センサ 2の中央部を X軸方向に切断する切断線を 表す。 Next, the acceleration sensor 2 which is a main component of the head collision prevention circuit of the present invention will be described. As the latest acceleration sensors, those that simultaneously detect three-axis acceleration in one chip have appeared, and are used in various fields such as game consoles, mobile phones, cameras, and automobiles. To explain. FIG. 3 is a perspective view of the piezoresistive element type three-axis acceleration sensor 2. The sensor 2 may, for example, 5 mm X 5 mm X l . Intended for housing the piezoelectric element to zero Kke the di size of 2 mm, using the resistance change of the element, in one chip, X yz The three axes of acceleration are simultaneously detected. The shape of the sensor 2 is connected to the central rectangular portion 6, the side 7 of even connexion surrounds four sides of this and space, and said central rectangular portion 6 and the central part 7 7 2 · · • each four sides The connecting part consists of 8 t 8 2 . The piezo element 9 is formed on the upper surface of the connecting portion 8. AA, represents a cutting line for cutting the center of the sensor 2 in the X-axis direction.
図 4は、 図 3の切断線 A A ' に沿って切断した断面図である。 ピ ェゾ抵抗素子 9は、 各連結部 8 i 8 2 、 · · · 上に形成されてな る。 中央矩形部 6は下部に突き出す錘 1 0を備えている。 FIG. 4 is a cross-sectional view taken along a cutting line AA ′ in FIG. Pi E zone resistive element 9, the connecting portions 8 i 8 2, ing is formed on · · · above. The central rectangular portion 6 has a weight 10 projecting downward.
このような構成において、 その素子に加速度によ り力 Fが加わる と、 錘 1 0の動きによ りセンサ 2は変形を起こし、 前記センサ 2に 加速度に比例した応力 σが発生し、 応力 に比例して、 該ピエゾ抵 抗素子 2 5の抵抗値 Rが変化する。  In such a configuration, when a force F is applied to the element by acceleration, the sensor 2 is deformed by the movement of the weight 10, and a stress σ proportional to the acceleration is generated in the sensor 2, and the stress is reduced. The resistance value R of the piezoresistive element 25 changes in proportion.
図 5は、 センサの表面の 2次元方向 x y方向に力が加わる時の 前記センサの変形を示す模式図である。  FIG. 5 is a schematic diagram showing deformation of the sensor when a force is applied in a two-dimensional xy direction on the surface of the sensor.
又、 図 6は、 センサ 2の表面に垂直である z軸方向に力が加わる 時の前記センサ 2の変形を示す模式図である。 四組の前記ピエゾ抵 抗素子 9からなるブリ ッジ回路 （図示しない） を構成することによ り、 非平衡の電圧を検出して、 これによ り加速度を検出するもので ある。  FIG. 6 is a schematic diagram showing deformation of the sensor 2 when a force is applied in the z-axis direction perpendicular to the surface of the sensor 2. By configuring a bridge circuit (not shown) including four sets of the piezoresistive elements 9, an unbalanced voltage is detected, and the acceleration is thereby detected.
このような 3軸加速度センサ 2は、 前記 X軸、 y軸、 z軸の動的 加速度を検出できるが、 この出力を使って、 静止時の傾き 及び静 止加速度である重力加速度を算出することが可能になっている。 前記したように、 3軸加速度センサ 2からは x、 y、 z軸方向の 各加速度を表す信号が生成されるが、 これら信号に基づいて加速度 αが算出され、 該加速度 αは速度計算回路 3に供給される。 速度計 算回路 3は、 前記加速度《 とが重力加速度 gに等しい時に、 該加速 度 αから速度 Vを算出する回路で、 公知の計算方法で計算される。 臨界速度判別回路 4は、 速度計算回路 3から受け取った速度 Vと臨 界速度 V c とを比較し、 V≥ V cである時に、 落下状態を示すァラ ーム信号 A L発生する。 Such a three-axis acceleration sensor 2 can detect the dynamic acceleration of the X-axis, y-axis, and z-axis.Using this output, the inclination at rest and the gravitational acceleration that is the static acceleration can be calculated. Is possible. As described above, signals representing the respective accelerations in the x, y, and z-axis directions are generated from the three-axis acceleration sensor 2, and the acceleration α is calculated based on these signals. Supplied to The speed calculation circuit 3 is a circuit for calculating the speed V from the acceleration α when the acceleration << is equal to the gravitational acceleration g, and is calculated by a known calculation method. The critical speed discrimination circuit 4 compares the speed V received from the speed calculation circuit 3 with the critical speed Vc, and generates an alarm signal AL indicating a falling state when V≥Vc.
これは、 装置が、 落下していることを意味する。 アラーム信号 A Lは、 ヘッ ドをシップヤードに退避する旨の信号と して、 ヘッ ドァ ームァクチユエータ駆動制御回路 2 0 3へ供給される。  This means that the device is falling. The alarm signal AL is supplied to the head actuator drive control circuit 203 as a signal to retreat the head to the shipyard.
このアラーム信号 A Lを受け、 へッ ドアームァクチユエータ制御 回路 2 0 3は、 ヘッ ドアームをシッビングゾーンに退避するよ うに 制御を行う。  Upon receiving this alarm signal AL, the head arm actuator control circuit 203 controls the head arm to retreat to the sibbing zone.
以上の動作を、 図 2に示すへッ ド衝突防止回路 1 に関するフ ロー チャートに従って説明する。  The above operation will be described with reference to a flowchart relating to the head collision prevention circuit 1 shown in FIG.
落下検出処理のフ ローは、 所定時間間隔でスター トする処理フ ロ 一である。  The flow of the drop detection process is a process flow that starts at a predetermined time interval.
始めに、 3軸加速度センサ 2から X、 y、 z軸方向の各加速度信 号が検出される （ステ ップ 1 ) 。 該加速度信号に基づいて、 装置の 加速度ひが算出される （ステップ 2 ) 。  First, acceleration signals in the X, y, and z-axis directions are detected from the three-axis acceleration sensor 2 (Step 1). The acceleration of the device is calculated based on the acceleration signal (step 2).
速度計算回路 3において、 前記加速度 ο; と重力加速度 g とを比較 し (ステ ップ 3 ) 、 方向が一致し、 ひ ≠ g の時 ( n 0 の場合) は、 メイ ン処理に移行する （ステップ 9 ) 。  In the speed calculation circuit 3, the acceleration ο; is compared with the gravitational acceleration g (step 3), and the directions match, and when the direction is g (in the case of n0), the processing shifts to the main processing ( Step 9).
方向が一致し、 o; = g の時は、 この状態が継続する時間を計時し 、 これを用いて速度 Vを計算する （ステップ 4 ) 。 該速度 Vと装置 が落下していると見なせる速度である臨界速度 V c とを比較し （ス テツプ 5 ) 、 V≥ V cの時には、 ハー ドディスク装置が落下してい ると判断し、 アラーム信号 A Lを発生する （ステップ 6 ) 。 該ァラ ーム信号 A Lを受信すると、 ヘッ ドアームァクチユエータ駆動制御 回路 2 0 3は、 へッ ドアームをシッ ビングゾーンに退避するよ うに 制御を行う （ステップ 7 ) 。 その後、 全ての処理を終了する (ステ ップ 8 ) 。 When the directions coincide and o; = g, the time during which this state continues is measured, and the velocity V is calculated using the time (step 4). The speed V is compared with the critical speed Vc, which is the speed at which the device can be considered to be falling. Step 5) If V≥Vc, it is determined that the hard disk drive is falling, and an alarm signal AL is generated (Step 6). When the alarm signal AL is received, the head arm actuator drive control circuit 203 controls the head arm to retreat to the shiving zone (step 7). After that, all the processing ends (Step 8).
ステップ 5において、 Vく V cの場合、 ステップ 1 に戻る。  If it is determined in step 5 that V is less than Vc, the process returns to step 1.
この処理は、 マイクロプロセッサを使って実現することができる し、 個別機能回路を使用して実現することもできる。 又このフロー は一例であって、 本発明はこれに限定されるものではない。  This processing can be realized by using a microprocessor or by using individual function circuits. This flow is an example, and the present invention is not limited to this flow.
又、 階段を下り る際等の短時間の落下状態では、 ヘッ ドの退避を 行わないよ うに設計するとよい。 なお、 ステップ 8の代わりに一定 時間を経過した後、 メイン処理に復帰するようにできる。 又、 音楽 再生に限らず、 音楽プレーヤに書き込みを行う場合にも、 本発明の 考えが適用できることは明らかである。  In addition, the head should not be evacuated when falling for a short time, such as when going down stairs. Instead of step 8, it is possible to return to the main processing after a certain time has passed. Also, it is clear that the idea of the present invention can be applied not only to music reproduction but also to writing to a music player.
ここでは、 ポータブルハードディスク装置の例をとつて説明した が、 固定型ハー ドディスク装置に 3軸加速度センサを応用して、 落 下によるへッ ドクラッシュの問題を予防できる。  Here, an example of a portable hard disk device has been described. However, a three-axis acceleration sensor can be applied to a fixed type hard disk device to prevent a head crash caused by a drop.
更なる応用と して、 上記説明した技術を用いて落下を予測し、 予 測結果に従ってアラーム音を発生することによ り、 ユーザ或いは他 の人の注意をひきつけることもできる。  As a further application, by predicting a fall using the above-described technology and generating an alarm sound according to the predicted result, it is possible to attract the attention of a user or another person.

Claims

求 の 範 囲 Range of request
1 . 加速度を検出し、 速度が一定値を超えたときヘッ ドを退避す る信号を生成するへッ ド衝突防止回路を備え、 前記信号によ りへッ ドをシップゾーンに退避するよう構成されてなることを特徴とする ハー ドディスク装置。 1. A head collision prevention circuit that detects acceleration and generates a signal to retreat the head when the speed exceeds a certain value is configured to retreat the head to the ship zone based on the signal. A hard disk drive characterized by being performed.
言青  Word blue
2 . 前記ヘッ ド衝突防止回路が、 加速度センサと、 前記加速度セ ンサに接続され、 該センサからの出力に基づいて速度を計算する速 度計算回路と、 前記速度計算回路に接続し、 前記計算された速度と 、 予め定められた臨界速度とを比較し、 前記計算された速度が前記 臨界速度を上回る場合にアラーム信号を生成する臨界速度判別回路 とからなることを特徴とする請求項 1記載のハードディスク装置。  2. The head collision prevention circuit is connected to an acceleration sensor, the acceleration sensor, and calculates a speed based on an output from the sensor; and a speed calculation circuit is connected to the speed calculation circuit. A critical speed discrimination circuit that compares the calculated speed with a predetermined critical speed and generates an alarm signal when the calculated speed exceeds the critical speed. Hard disk device.
3 . 前記へッ ド衝突防止回路が 1チップからなることを特徴とす る請求項 2記載のハー ドディスク装置。  3. The hard disk drive according to claim 2, wherein the head collision prevention circuit is formed of one chip.
4 . 前記加速度センサを除く前記へッ ド衝突防止回路の少なく と も一部と加速度センサとが 1チップからなることを特徴とする請求 項 2記載のハー ドディスク装置。  3. The hard disk drive according to claim 2, wherein at least a part of the head collision prevention circuit excluding the acceleration sensor and the acceleration sensor are formed of one chip.
5 . 前記加速度センサが 3軸加速度センサであることを特徴とす る請求項 2記載のハードディスク装置。  5. The hard disk drive according to claim 2, wherein the acceleration sensor is a three-axis acceleration sensor.
6 . 前記 3軸加速度センサがピエゾ抵抗型 3軸加速度センサであ ることを特徴とする請求項 5記載のハー ドディスク装置。  6. The hard disk drive according to claim 5, wherein the three-axis acceleration sensor is a piezoresistive three-axis acceleration sensor.
7 . 前記へッ ド衝突防止回路がハー ドディスク装置の基板に载置 されることを特徴とする請求項 2又は 3記載のハー ドディスク装置  7. The hard disk drive according to claim 2, wherein the head collision prevention circuit is mounted on a substrate of the hard disk drive.
8 . 前記ヘッ ド衝突防止回路がハー ドディスク ドライブ回路と一 体的に I C化されてなることを特徴とする請求項 2記載のハー ドデ ィスク装置。 8. The hard disk drive according to claim 2, wherein the head collision prevention circuit is integrated with the hard disk drive circuit.
PCT/JP2003/013137 2003-04-11 2003-10-14 Hard disk device WO2004093076A1 (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1777582A1 (en) * 2005-10-13 2007-04-25 Sony Corporation Information processing method and apparatus, imaging apparatus, and computer control program for such apparatus

Families Citing this family (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7042663B2 (en) * 2002-10-03 2006-05-09 Hitachi Global Storage Technologies Netherlands B.V. Magnetic disk protection mechanism, computer system comprising protection mechanism, protection method for magnetic disk, and program for protection method
JP2005114402A (en) * 2003-10-03 2005-04-28 Sony Corp Method and device for detecting falling-off
JP2005129172A (en) 2003-10-24 2005-05-19 Matsushita Electric Ind Co Ltd Impact protective device for hard disk drive
KR100618846B1 (en) 2004-07-16 2006-09-01 삼성전자주식회사 Method for protecting a hard disk drive from shock and a hard disk drive therefore
KR100630697B1 (en) 2004-08-11 2006-10-02 삼성전자주식회사 Method and apparatus for protecting hard disk drive in portable mobile device
KR20060022020A (en) * 2004-09-06 2006-03-09 삼성전자주식회사 Portable electronic device and protecting method for hard disk drive thereof
JP4736594B2 (en) * 2005-03-08 2011-07-27 ソニー株式会社 COMPOSITE STORAGE DEVICE, DATA WRITE METHOD, AND PROGRAM
US8005347B2 (en) 2005-07-13 2011-08-23 Victor Company Of Japan, Limited Recording/reproducing device capable of avoiding or reducing various malfunctions caused by dropping
KR100723494B1 (en) * 2005-07-23 2007-06-04 삼성전자주식회사 Method of detecting free fall of a mobile device, apparatus for the same and recording medium for the same
JP2007115309A (en) 2005-10-19 2007-05-10 Hitachi Global Storage Technologies Netherlands Bv Magnetic disk drive
KR100734284B1 (en) 2005-11-09 2007-07-02 삼성전자주식회사 Offset compensation method of acceleration detector, recording medium storing program to execute method and apparatus thereof
JP2007335016A (en) 2006-06-15 2007-12-27 Fujitsu Ltd Head slap detection device, storage device, head slap detection method, and head slap detection program
JP5043549B2 (en) 2007-07-30 2012-10-10 キヤノン株式会社 Electronic device, imaging apparatus, and control method of electronic device
WO2017183646A1 (en) * 2016-04-21 2017-10-26 富士フイルム株式会社 Composite sensor

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH08221886A (en) * 1995-02-16 1996-08-30 Sanyo Electric Co Ltd Data recorder
JPH10153616A (en) * 1996-11-21 1998-06-09 Tokai Rika Co Ltd Acceleration sensor
JP2000241442A (en) * 1999-02-22 2000-09-08 Sharp Corp Protective mechanism and portable device for drop detection mechanism and magnetic disk device
JP2002107374A (en) * 2000-07-24 2002-04-10 Matsushita Electric Ind Co Ltd Acceleration sensor, acceleration detecting device, and positioning device

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH08221886A (en) * 1995-02-16 1996-08-30 Sanyo Electric Co Ltd Data recorder
JPH10153616A (en) * 1996-11-21 1998-06-09 Tokai Rika Co Ltd Acceleration sensor
JP2000241442A (en) * 1999-02-22 2000-09-08 Sharp Corp Protective mechanism and portable device for drop detection mechanism and magnetic disk device
JP2002107374A (en) * 2000-07-24 2002-04-10 Matsushita Electric Ind Co Ltd Acceleration sensor, acceleration detecting device, and positioning device

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1777582A1 (en) * 2005-10-13 2007-04-25 Sony Corporation Information processing method and apparatus, imaging apparatus, and computer control program for such apparatus
US7689840B2 (en) 2005-10-13 2010-03-30 Sony Corporation Information processing apparatus, imaging apparatus, and information processing method, and computer program

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