JP2006085853A - Disk device for recording/reproducing - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent failures caused by the collision of a head floating from a disk due to an impact from the outside with the disk by elastic force of a suspension. <P>SOLUTION: A disk device for recording and reproducing is provided with a high rigidity electrostatic connection member 11 having rigidity higher than that of the suspension 5 with respect to deflection in a direction vertical to the surface of the disk 2 caused by the impact from the outside. When the suspension 5 is deformed in a direction away from the disk during occurrence of the impact, the high rigidity electrostatic connection member 11 is coupled to the suspension 5, thereby preventing the collision of a head 4 with the disk 2 caused by restoring force of the suspension. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a recording / reproducing disk device having a head such as a magnetic head or an optical head.

  A typical example of a conventional recording / reproducing disk device is a hard disk drive. This hard disk drive has as its main components a disk that is driven to rotate by a spindle motor, a head that reads and writes information, a suspension that presses the head, an arm that supports the suspension, and an arm position that moves in the radial direction of the disk. It consists of a track control actuator. When this type of device is subjected to a strong impact, the head may give a dent to the disk. In other words, the head is pressed against the disk with a load of several tens of mN, but when an impact exceeding 100 G is applied, the head jumps from the disk surface and then the head is pressed against the disk by the elastic force of the suspension. It is struck and damages the head and the disk. As a method for preventing this phenomenon called head slap, a method of limiting the deformation range of the suspension with a restricting member (for example, Patent Document 1), or retreating to a position where the head does not collide with the disk when an impact is detected by a sensor. There was a method (for example, patent document 2) performed.

  First, a method using a limiting member, which is a conventional method, will be described with reference to FIGS. FIG. 11 shows a conventional recording / reproducing disk device described in Patent Document 1. In FIG. This apparatus includes a disk 2 as a recording medium, a spindle motor 3 that rotates and supports the disk 2, a head 4 that is in contact with or close to the surface of the disk 2 to record and reproduce the disk, and the head 4 is elastic. The suspension 5 for supporting, the arm 4 for supporting the head 4 and the suspension 5, and the track control actuator 7 for driving the arm 6 to move the head 4 in the radial direction of the disk 2 were provided. . These components are housed in a sealed case 8 and are shielded from the outside air. A protrusion by the limiting member 9 was formed on a part of the surface of the suspension 5. FIGS. 12A and 12B show changes in the state when subjected to an impact. FIG. 12A shows the initial state, FIG. 12B shows the state when the head 4 jumps due to the impact, and FIG. 12C shows the elastic force of the suspension thereafter. A state in which the head 4 has collided with the disk 2 and (d) shows a state in which the head 4 subsequently returns to a steady state. The suspension 5 is deformed by the impact, and the head 4 jumps from the surface of the disk 2, but the jumping amount is limited as shown in FIG. Reduces the strength with which the disk 2 is struck against the disk 2 and suppresses the occurrence of damage.

Next, a method of retracting the head when the sensor detects an impact, which is a conventional method, will be described with reference to FIG. FIG. 13 shows a portion around the head in the conventional recording / reproducing disk device described in Patent Document 2. In FIG. The impact applied to the disk device is detected by sensors 25 provided on both the front and back surfaces of the suspension 5. When the sensor detects an impact, the head 4 is urgently levitated from above the disk by the head levitation actuator 28 to avoid collision of the head 4 and the disk.
JP-A-11-213581 (FIGS. 1 and 4) Japanese Patent Laid-Open No. 11-53856 (FIG. 7)

  However, in the conventional configuration in which the limiting member is provided, although the strength with which the head is hit by the disk is reduced, the hitting itself cannot be avoided, and the landing posture on the disk surface cannot be controlled, so that the effect of suppressing damage can be prevented. Has the problem of being limited.

  In addition, in the above-described conventional configuration in which the head is urgently levitated when an impact is detected by the sensor, it is necessary to mount a head levitation actuator that can urgently levitate the head to prevent damage. This causes an increase in the mass of the part. This increase in mass reduces the resonance frequency at the time of position control for head tracking, and has a problem that accurate tracking becomes difficult at high speed. In addition, the impact when the disk device collides with the floor surface after free fall often causes head slap, but in order to avoid this by this conventional method, the free fall is detected by an acceleration sensor, and the subsequent impact is It is necessary to raise the head urgently before it occurs. However, if such a method is adopted, the head will rise unnecessarily urgently when an acceleration similar to free fall is applied to the disk device during normal carrying without any significant impact, and each time the disk is There was a problem that reading and writing was interrupted. Furthermore, since the impact applied when the disk device is struck to something has no sign of acceleration, there has been a problem that the emergency flying of the disk is not in time.

  SUMMARY OF THE INVENTION An object of the present invention is to solve the above-described conventional problems, and to provide a recording / reproducing disk device that suppresses the occurrence of damage due to a head-disk collision when an impact is applied.

  In order to solve the above-described conventional problems, the recording / reproducing disk device of the present invention has a high-rigidity member that is coupled to the suspension when the suspension is deformed in a direction away from the disk due to an external impact. The deformation state is maintained. With this configuration, it is possible to prevent the recording / reproducing head from being struck against the disk when the recording / reproducing disk device receives an impact.

  According to the recording / reproducing disk apparatus of the present invention, it is possible to suppress the occurrence of a failure when receiving an impact resistance.

  Embodiments of the present invention will be described below with reference to the drawings.

(Embodiment 1)
FIG. 1 is a top view of the inside of a recording / reproducing disk device according to an embodiment of the present invention. In FIG. 1, the same components as those in FIG. A high-rigidity member 10 that is a feature of the present embodiment is provided with a gap above the suspension 5 so as to extend from the arm 6 portion. The high-rigidity member 10 has rigidity that is less likely to bend in a direction perpendicular to the disk surface than the suspension 5 when an external impact is applied. Usually, the suspension is a thin leaf spring. However, if the high-rigidity member has a circular cross-sectional shape instead of the thin plate, for example, such a magnitude relationship of rigidity can be provided. FIG. 2 is a side view of FIG. 1 when a normal recording / reproducing operation is performed in the first embodiment of the present invention. A highly rigid member 10 is disposed above the suspension 5 via a gap. Further, a circuit for detecting electrical resistance is provided between the high-rigidity member 10 and the arm 6. At this time, the suspension 5, the arm 6, and the high-rigidity member 10 are all conductors. Further, the joint portion between the arm 6 and the high-rigidity member 10 in FIG. 2 is insulated, while the joint portion between the arm 6 and the suspension 5 is in a conductive state.

  Here, when an external impact is applied to the recording / reproducing disk of this embodiment, depending on the type of the impact, as shown in FIG. 3, the head 4 moves away from the disk 2 as compared with the normal case. There are cases where it floats up. At this time, the high-rigidity member 10 has higher rigidity in the direction perpendicular to the surface of the disk 2 than the suspension 5 and is less likely to bend. Therefore, a part of the gap between the high-rigidity member 10 and the suspension 5 disappears and contact occurs. . The occurrence of this contact can be detected by short-circuiting both ends of the ohmmeter. If the recording operation is stopped immediately after this detection is performed, it is possible to prevent erroneous information from being recorded thereafter due to the impact. Further, by driving the track control actuator 7, moving the arm 6 in the radial direction of the disk 2 and retracting the head 4 out of the surface of the disk 2, malfunctions can be prevented thereafter, and the retracting operation can be performed. After the completion, the head 4 is not hit against the surface of the disk 2 and the occurrence of a failure can be prevented.

  In the present embodiment, the contact is detected using electric resistance. However, if a thin insulating film is formed on the contact portion, a short circuit does not occur due to the contact, but the suspension 5 and the high-rigidity member 10 Since the capacitance between the two changes, the contact can be detected by measuring this change.

(Embodiment 2)
FIG. 4 is a side view of the case where a normal recording / reproducing operation is performed in the second embodiment of the present invention. The same components as those in the first embodiment are denoted by the same reference numerals, and description thereof is omitted. A high-rigidity electrostatic coupling member 11 that is a feature of the present embodiment is provided in a state of floating above the suspension 5 so as to extend from the arm 6 portion. The high-rigidity electrostatic coupling member 11 has a rigidity that is less likely to bend in the direction perpendicular to the disk surface than the suspension 5 when an external impact is applied, like the high-rigidity member 10 in the first embodiment. And As a feature of the present embodiment, a high-rigidity electrostatic coupling member 11 and a power source 18 exist. The output voltage of the power source 18 can be controlled by a control circuit. An acceleration sensor is connected to the control circuit, and the control circuit can adjust the output voltage in accordance with the acceleration applied to the recording / reproducing disk device. If the power source 18 is connected so as to generate a potential difference between the suspension 5 that is a conductor and the high-rigidity electrostatic coupling member 11, the wiring method and the like are arbitrary, but in FIG. Such a wiring can be implemented by making the suspension 5 short-circuited and configuring the high-rigidity electrostatic coupling member 11 and the arm 6 in an insulated state. Further, the contact portion between the suspension 5 and the high-rigidity electrostatic coupling member 11 is assumed to have insulating properties. In this configuration, if a voltage is applied between the suspension 5 and the high-rigidity electrostatic coupling member 11, electrostatic attraction works, but the magnitude is determined by the distance between the high-rigidity electrostatic coupling member 11 and the suspension 5. Since it is sufficiently large, it does not significantly affect the adjustment of the strength of the pressing force of the head 4 to the disk 2, which is the original action of the suspension. However, when the distance between the tip portion of the suspension 5 and the tip portion of the high-rigidity electrostatic coupling member 11 is sufficiently close or in contact with each other due to an external impact, the electrostatic attractive force at the tip portion increases. FIG. 5 is a diagram when an impact is applied in the first embodiment of the present invention, and the high-rigidity electrostatic coupling member 11 and the suspension 5 are held in contact with and coupled to each other by the electrostatic attraction accompanying the potential difference. An insulating coating is applied to the coupling portion so that a voltage can be continuously applied between the suspension 5 and the high-rigidity electrostatic coupling member 11. As a result, the state in which the head 4 is lifted from the disk 2 by the electrostatic force is maintained, and thereafter the head 4 is not struck against the disk 2 by the restoring force of the suspension. As a result, failure of the apparatus can be prevented.

  The voltage of the power source 18 may be a constant voltage or may be appropriately controlled by a control circuit. In particular, if the voltage is made variable by the control circuit using information from the acceleration sensor, the effect of the present invention can be enhanced. If the acceleration sensor detects that an external impact or vibration has been applied, the voltage can be increased so that when the head 4 is lifted by the impact or vibration, the suspension 5 and the high-rigidity electrostatic coupling member can be surely secured. Since 11 is coupled, it can be more reliably prevented that the head 4 is struck again when it returns to the surface of the disk 2 to cause a failure. Further, when the acceleration sensor detects acceleration corresponding to free fall, there is a high possibility that the recording / reproducing disk device is in the fall state. If the voltage is increased at this time, the suspension 5 and the high-rigidity electrostatic coupling member 11 can be more reliably coupled with each other in the event of an impact caused by a collision with the floor surface that subsequently occurs. It is possible to prevent the head 4 from being struck against the disk 2 at the time of impact. The difference from a conventional recording / reproducing disk device having an acceleration sensor is that an impact that causes the head 4 to actually lift up from the surface of the disk 2 is applied even if an acceleration that is expected to deal with the impact is detected. Unless the suspension 5 and the high-rigidity member 10 are not coupled, the recording / reproducing can be continued. The conventional method has the disadvantage that recording / reproduction is interrupted unnecessarily due to a malfunction as the safety level is increased because the head is retracted when it is determined that the acceleration that needs to be dealt with has been added. This has the effect of avoiding such unnecessary interruptions.

  Since the recording / reproducing operation cannot be resumed in the coupled state, the power source 18 may be stopped by the control circuit in order to cancel the recording / reproducing operation. Then, the power source 18 may be stopped. The detection of the combined state may be determined as being in the combined state when the information cannot be reproduced. Moreover, you may perform by providing the structure equivalent to the contact detection method in Embodiment 1 separately from the structure of a present Example.

  Note that the method of releasing the coupled state by power control in this embodiment can be used when a coupling force other than an electrostatic force is used as long as a power source is required for coupling.

(Embodiment 3)
FIG. 6 is a side view showing a state after an impact is applied to the recording / reproducing disk device of the present embodiment. Instead of the high-rigidity electrostatic coupling member 11 in the second embodiment, a high-rigidity magnetic member 12 and a coil 20 are provided. The high-rigidity magnetic body member 12 uses a material that functions as a magnetic core of an electromagnet when considered to be integrated with the power source 18 and the coil 20. Further, a magnetic material is used at least in the vicinity of the tip of the suspension 5. Then, when the head 4 is lifted from the disk 2 due to the impact, the suspension 5 and the distal end portion of the high-rigidity member 10 are coupled by attractive force due to magnetic force. As a result, the state in which the head 4 is lifted from the disk 2 by the action of the magnetic force is maintained, and the head 4 is not hit against the disk 2 by the restoring force of the suspension 5 thereafter. As a result, failure of the apparatus can be prevented.

(Embodiment 4)
FIG. 7 is a side view showing a state after an impact is applied to the recording / reproducing disk device of the present embodiment. Instead of the high-rigidity electrostatic coupling member 11 and the power supply 18 in the second embodiment, a high-rigidity piping member 13, a flexible tube 19, and an exhaust pump are provided. Air is sucked at the tip portion of the high-rigidity piping member 13 close to the head 4 by the exhaust pump. Then, when the tip of the high-rigidity pipe member 13 and the suspension 5 come into contact with each other due to an impact, the suspension 5 is adsorbed to the high-rigidity pipe member 13, so that the head 5 is not subsequently struck against the disk 2 and a failure occurs. Can be prevented.

(Embodiment 5)
FIG. 8 is a side view of the recording / reproducing disk device of the present embodiment. FIG. 8A shows a state in which the hook receiver 16 fixed to the suspension 5 and the high-rigidity hook member 14 are joined after the impact is generated. FIGS. 8 (b) and 8 (c) show an enlarged view of the occurrence of this coupling, and when an impact is applied and the head is lifted (c) from the state (b) where normal information is read and written (c). ) State. The high-rigidity hook member 14 has a hook-like shape. Further, a hook receiver 16 is attached to the surface of the suspension 5 opposite to the head 4. When the head 4 is lifted from the disk 2 due to an impact from the outside, the hook at the tip of the high-rigidity hook member 14 and the hook receiver 16 are engaged with each other to be connected.

  As described above, when the head is lifted due to an impact, the head 4 is held in a state of being lifted from the disk 2 by the engagement of the hooks, so that the head 4 is not hit against the disk 2 by the restoring force of the suspension thereafter. . As a result, failure of the apparatus can be prevented.

(Embodiment 6)
FIG. 9 is a top view of the inside of the recording / reproducing disk device according to the embodiment of the present invention. 9, the same components as those in FIG. 11 are denoted by the same reference numerals, and description thereof is omitted. A high-rigidity adhesive member 15, which is a feature of the present embodiment, is provided with a gap above the suspension 5 so as to extend from the arm 6 portion. The high-rigidity adhesive member 15 has adhesiveness and has rigidity that is less likely to bend in the direction perpendicular to the disk surface than the suspension 5 when an external impact is applied. Usually, the suspension is a thin leaf spring. However, if the high-rigidity member has a circular cross-sectional shape instead of a thin plate, for example, such a magnitude relationship of rigidity can be provided. Further, a coupling releasing claw 17 is provided outside the surface of the disk 2, and the height of the arrangement corresponds to between the suspension 5 and the high-rigidity adhesive member 15.

  FIG. 10A is a side view of FIG. 9 when a normal recording / reproducing operation is performed in the embodiment of the present invention. On the other hand, when an impact is applied and the head 4 is lifted from the disk 2, the suspension 5 and the high-rigidity adhesive member 15 adhere to each other, and the head 4 is prevented from being struck against the disk 2 after the impact. it can.

  Since recording and reproduction cannot be resumed in the adhesive state, the head 4 is moved out of the surface of the disk 2 by driving the track control actuator 7 and moving the arm 6 in the radial direction of the disk 2 for resumption. Let Due to this movement, the coupling releasing claw is inserted between the suspension 5 and the high-rigidity adhesive member 15, so that the adhesive part is peeled off. Therefore, if the track control actuator 7 is driven again to return the head to the surface of the disk 2, recording / reproduction can be resumed.

  Note that the method of releasing the combined state using the connection release claw described in the present embodiment is not limited to the case where the connection is based on adhesion, but can also be used in the case of connection using another method.

  A recording / reproducing disk device according to the present invention has a mechanism for fixing a suspension deformed by an impact in a deformed state, and suppresses a failure that occurs when a head that once floated collides with a disk again when subjected to an impact. Useful for.

Top view of Embodiment 1 of the present invention Side view when performing normal operation in Embodiment 1 of the present invention Side view when an impact is applied in Embodiment 1 of the present invention Side view when performing normal operation in Embodiment 2 of the present invention Side view when an impact is applied in Embodiment 2 of the present invention Side view when an impact is applied in Embodiment 3 of the present invention Side view when an impact is applied in Embodiment 4 of the present invention Side view of Embodiment 5 of the present invention Top view of Embodiment 6 of the present invention Side view of Embodiment 6 of the present invention Top view of an example of the inside of a conventional recording / reproducing disk device Sectional view of an example of a conventional recording / reproducing disk device A diagram of a portion around a head of an example of a conventional recording / reproducing disk device

Explanation of symbols

2 Disc 3 Spindle motor 4 Head 5 Suspension 6 Arm 7 Track control actuator 8 Case 9 Limiting member 10 High rigidity member 11 High rigidity electrostatic coupling member 12 High rigidity magnetic member 13 High rigidity piping member 14 High rigidity hook member 15 High Rigid adhesive member 16 Hook receiver 17 Decoupling claw 18 Power source 19 Flexible tube 20 Coil 25 First sensor 26 Second sensor 27 Gimbal 28 Head floating actuator

Claims (21)

A disk that is driven to rotate;
A head for recording and reproducing the disk;
A suspension that supports the head and is elastically deformable in a direction perpendicular to the disk;
An arm for supporting the suspension;
In a recording / reproducing disk device comprising a track control actuator for moving the arm in the radial direction of the disk,
Having a highly rigid member whose rigidity in a direction perpendicular to the disk surface is higher than that of the suspension;
The high-rigidity member is disposed at a position farther from the disk surface than the suspension,
The high-rigidity member is fixed to the arm;
The recording / reproducing disk device according to claim 1, wherein at least a part of the high-rigidity member is arranged with a gap with respect to the suspension. 2. The recording / reproducing disk device according to claim 1, wherein at least a part of the gap is brought into contact with an external impact. 3. The recording / reproducing disk device according to claim 2, further comprising means for detecting the contact. 4. The recording / reproducing disk device according to claim 3, wherein the detecting means is based on a capacitance. 4. The recording / reproducing disk device according to claim 3, wherein the detecting means is based on electric resistance. 6. The recording / reproducing disk device according to claim 3, wherein the recording operation is stopped when the detection is made. 4. When the detection is made, the track control actuator is driven to move the arm in the radial direction of the disk and to retract the head out of the surface of the disk. 7. The recording / reproducing disk device according to 6. 8. The recording / reproducing disk device according to claim 2, wherein the high-rigidity member and the suspension are coupled to each other in at least a part of the contact portion. 9. The recording / reproducing disk device according to claim 8, wherein the presence / absence of the coupling is detected based on whether reproduction is possible. 10. The recording / reproducing disk device according to claim 8, wherein the coupling is released when the actuator is driven to retract the head out of the surface of the disk. 11. The recording / reproducing disk device according to claim 10, wherein the release is performed by inserting a coupling release member between the high-rigidity member and the suspension. 12. The recording / reproducing disk device according to claim 8, wherein an attractive force that increases as the gap becomes narrower acts between the suspension and the highly rigid member. 13. The recording / reproducing disk device according to claim 8, wherein the coupling force is due to electrostatic force. 13. The recording / reproducing disk device according to claim 8, wherein the coupling force is a magnetic force. 13. The recording / reproducing disk device according to claim 8, wherein the coupling force of the coupling is adsorption by a pressure difference. 16. The recording / reproducing disk device according to claim 8, further comprising a control circuit for controlling the strength of the coupling force. 17. The recording / reproducing disk device according to claim 8, wherein an acceleration sensor is connected to the control circuit. 18. The recording / reproducing disk device according to claim 17, wherein when the acceleration sensor detects an external impact, the control circuit performs control so as to increase the coupling force. 19. The recording / reproducing disk device according to claim 17, wherein, when the acceleration sensor detects a free fall state, the control circuit performs control so as to increase the coupling force. 12. The recording / reproducing disk device according to claim 8, wherein the coupling force is a result of meshing. 12. The recording / reproducing disk device according to claim 8, wherein the coupling force is due to an adhesive force.

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