WO2006073086A1 - ヘッド支持装置及びそれを備えたディスク装置及びそれを備えた携帯用電子機器 - Google Patents
ヘッド支持装置及びそれを備えたディスク装置及びそれを備えた携帯用電子機器 Download PDFInfo
- Publication number
- WO2006073086A1 WO2006073086A1 PCT/JP2005/023876 JP2005023876W WO2006073086A1 WO 2006073086 A1 WO2006073086 A1 WO 2006073086A1 JP 2005023876 W JP2005023876 W JP 2005023876W WO 2006073086 A1 WO2006073086 A1 WO 2006073086A1
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- WO
- WIPO (PCT)
- Prior art keywords
- head
- head support
- recording medium
- head slider
- center
- Prior art date
Links
Classifications
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
- G11B5/48—Disposition or mounting of heads or head supports relative to record carriers ; arrangements of heads, e.g. for scanning the record carrier to increase the relative speed
- G11B5/4806—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 specially adapted for disk drive assemblies, e.g. assembly prior to operation, hard or flexible disk drives
- G11B5/4813—Mounting or aligning of arm assemblies, e.g. actuator arm supported by bearings, multiple arm assemblies, arm stacks or multiple heads on single arm
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- 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
- G11B5/4806—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 specially adapted for disk drive assemblies, e.g. assembly prior to operation, hard or flexible disk drives
- G11B5/4826—Mounting, aligning or attachment of the transducer head relative to the arm assembly, e.g. slider holding members, gimbals, adhesive
-
- 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
- G11B5/4806—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 specially adapted for disk drive assemblies, e.g. assembly prior to operation, hard or flexible disk drives
- G11B5/4833—Structure of the arm assembly, e.g. load beams, flexures, parts of the arm adapted for controlling vertical force on the head
Definitions
- Head support device disk device including the same
- portable electronic device including the same
- the present invention relates to a disk device having a floating head, such as a magnetic disk device, an optical disk device, a magneto-optical disk device, etc., a head support device, a disk device using the head support device, and a head support.
- the present invention relates to a portable electronic device equipped with the device. Background art
- a head support device of a disk device having a floating type head a head support device used in a magnetic disk device such as a hard disk device is used. explain.
- a head support device 161 includes a suspension 162 having a relatively low rigidity, a leaf spring portion 163, a relatively high rigidity, and a support arm 164.
- a head slider 165 mounted with a magnetic head (not shown) is provided on the lower surface of one end of the suspension 162.
- the magnetic recording medium 166 is rotated by a spindle motor 167.
- the head slider 165 floats from the magnetic recording medium 166 by a certain amount according to the balance with the urging force by the leaf spring portion 163. That is, the magnetic head mounted on the head slider 165 is configured to float a certain amount from the magnetic recording medium 166.
- the head support device 161 rotates around the bearing portion 169 by the action of the voice coil 168 provided on the support arm 164 during recording or reproduction by the magnetic recording / reproducing device.
- a magnetic head mounted on the head slider 165 is positioned with respect to a desired track of the magnetic recording medium 166, and is configured to perform recording or reproduction.
- FIG. 17 is a perspective view of a main part of a portion where the magnetic head is provided in the head support device 161 of FIG.
- the magnetic head (not shown) is provided on the surface of the head slider 165 provided on the lower surface side of one end of the suspension 162 and facing the magnetic recording medium 166 (not shown in FIG. 17). It has been.
- the other end of the suspension 162 is bent to form a leaf spring portion 163, and the leaf spring portion 163 is locked to the support arm 164.
- the leaf spring part 163 is provided with a notch part 171. Further, the structure is such that the rigidity of the leaf spring portion 163 is lowered and the spring constant is reduced to provide flexibility.
- a head support device having such a configuration is, for example, Japanese Patent, Japanese Patent No. 2894262, Japanese Patent No. 3374846, Japanese Patent Application Laid-Open No. 6-259905, Japanese Patent Application Laid-Open No. 2004-30856, and Japanese Patent Application Laid-Open No. 2004-30856. 2004- 62936.
- a load (load load) required for the head slider 165 is required to stably lift the head slider 165 mounted with the magnetic head from the magnetic recording medium 166.
- the leaf spring 163 must have a sufficient reaction force to apply.
- flexibility to suppress the change in load load on the magnetic recording medium 166 due to the vertical movement of the magnetic recording medium 166 and manufacturing variations in the distance between the head slider 165 and the magnetic recording medium 166 during mass production, etc. Must be given.
- the leaf spring portion 163 is provided with a notch 171 or the suspension 162 has a thin plate structure so that the rigidity of the leaf spring portion 163 is increased. Can be considered. If a configuration is adopted in which the spring constant is reduced and the flexibility is adopted, when the head support device 161 moves the magnetic head to the target track position at a high speed, the resonance frequency becomes lower, and twisting, etc. The vibration mode occurs and off-track occurs. For this reason, it takes time to settle the generated vibration mode, and there is a limit to shortening the access time.
- the center of gravity is positioned closer to the magnetic head than the leaf spring portion 163. Therefore, when a strong impact or the like is applied to the magnetic recording / reproducing apparatus from the outside, the levitation force generated by the air flow generated in the head slider 165 due to the rotation of the magnetic recording medium 166 and the head slider 165 are magnetically recorded. The balance with the biasing force biased toward the medium 166 is lost. For this reason, an undesired phenomenon occurs when the head slider 165 jumps from the magnetic recording medium 166. Further, there is a problem that the head slider 165 collides with the magnetic recording medium 166 and causes magnetic damage or mechanical damage to the magnetic head (not shown) or the magnetic recording medium 166.
- Such a problem also occurs in a disk device having a floating type head that is not limited to a magnetic recording / reproducing device, such as an optical disk device or a magneto-optical disk device.
- the magnetic head (not shown) or the magnetic recording medium 166 may be magnetically damaged or Mechanical damage may occur, the functionality of the portable electronic device may deteriorate, or malfunction may occur that is sufficient for practical use.
- the main part of the head support device is made of a highly rigid material
- a head slider is attached to the lower surface of one end of the suspension, and the head can be rotated in the radial direction of the magnetic recording medium with the bearing part as the center of rotation.
- the support arm can be rotated in the vertical direction on the surface of the magnetic recording medium around a fulcrum (vertical rotation axis) provided between the voice coil provided on the other end side and the head slider.
- a head support device having a configuration in which a leaf spring portion for applying an urging force for generating a load is provided on the portion (for example, Japanese Patent No. 3374746, Japanese Patent Publication, No. 2004-30856, JP 2004-62936).
- the head slider has a balance between the load load and the levitation force. As a result, it floats on the magnetic recording medium, and if the balance is broken, the flying becomes unstable. If a strong impact that eliminates the load load is applied from the outside, the head slider will be lifted only by the levitation force, which makes it extremely unstable. At least suppressing the fluctuation of the members other than the head slider among the members rotating around the vertical rotation axis suppresses the load load fluctuation, so that the flying of the head slider is stabilized.
- the deviation of the center of gravity position of the members rotating around the vertical rotation axis, excluding the head slider, with respect to the vertical rotation axis is set to a predetermined amount or less. It will be necessary.
- the present invention provides a head support device capable of further improving the impact resistance of the head support device, a disk device including the head support device, and a portable electronic device including the head support device.
- the present invention increases the rigidity and makes the resonance frequency very large to stabilize the resonance characteristics. It is another object of the present invention to provide a head support device that has high flexibility, can provide a stable load load, and has high impact resistance. Also, by mounting such a head support device, it is possible to improve the head positioning control characteristics and move the magnetic head to the target track position at high speed. As a result, a highly reliable disk device with greatly reduced access time is provided.
- the specific configuration of the head support device of the present invention includes, for example, a head slider having a head element that is a signal conversion element, a head support arm that connects the head slider to one end, and a head support.
- a voice coil disposed at the end opposite to the head slider across the center of the horizontal rotation shaft that rotates the arm in a direction parallel to the recording medium surface, and the head support arm perpendicular to the recording medium surface
- a head support having a pair of pivots that form a vertical rotation shaft that rotates in any direction, and an elastic mechanism that generates a load that urges the head slider toward the surface of the recording medium about the vertical rotation shaft Device.
- the head support device substantially matches the position of the center of gravity of the total mass of the members excluding the head slider among the members rotating around the vertical rotation axis with the position of the vertical rotation axis.
- the vertical rotation axis is the origin, and the head slider side is positive
- the position of the head slider that is generated by receiving an allowable maximum impact acceleration in a direction that causes the head support arm to rotate in a direction that is perpendicular to the recording medium and that the head slider approaches the recording medium.
- the center of gravity of the member that rotates around the vertical rotation axis excluding the head slider when the minimum allowable flying height between the surface of the recording medium and the surface of the head slider facing the recording medium (ABS surface) is ⁇ + And ⁇ +.
- the position of the head slider generated by receiving the allowable maximum impact acceleration in the direction perpendicular to the recording medium and rotating the head support arm in the direction in which the head slider moves away from the recording medium force.
- ⁇ ⁇ and ⁇ ⁇ be the center of gravity of the member when the movement reaches the allowable minimum flying height.
- the center of gravity position ⁇ of the total mass of the members is set so as to satisfy the formula (1) and the center of gravity is set to ⁇ , the member rotates around the vertical rotation axis when the head slider is included.
- the center of gravity position ⁇ satisfies the relationship of equation (2) with respect to the vertical rotation axis.
- the head slider side is defined as positive (+), and the head slider and the opposite side are defined as negative (one), as in equation (1).
- a head generated by receiving an allowable maximum impact acceleration in a direction perpendicular to the recording medium and rotating the head support arm in a direction in which the head slider approaches the recording medium.
- ⁇ is negative is defined as ⁇ +.
- the position of the head slider generated by receiving the allowable maximum impact acceleration in the direction perpendicular to the recording medium and rotating the head support arm in the direction in which the head slider moves away from the recording medium force. Displacement force
- the center of gravity of the member ⁇ is defined as ⁇ — and when the center of gravity ⁇ is positive is defined as ⁇ —.
- the total mass of the members excluding the head slider is m, and the mass of the head slider is m.
- ⁇ represents the position of the center of gravity represented by (m l + ⁇ ⁇ ) Z (m + m), ⁇
- 1 3 2 1 3 2 represents the position of the center of gravity represented by (m 1 + m a) Z (m + m).
- the rigid part and the elastic part can be integrally formed.
- the urging force to the head slider by the elastic mechanism can be set arbitrarily.
- the rotation of the head support arm caused by the impact is suppressed, and the head support arm Due to the rotation and the impact acting on the head slider, the movement of the head slider can be suppressed within a range where the head slider does not contact the surface of the recording medium. For this reason, the impact resistance can be improved and the resonance frequency can be increased.
- a head support device capable of high response characteristics and high-speed access can be realized.
- the head support device by configuring the head support device to be rotatable in a direction perpendicular to the surface of the recording medium, there is also an effect that the head can be held away from the recording medium force when the recording medium is stopped. .
- the position of the center of gravity is set in the vicinity of the intersection of the longitudinal center line of the head support arm and the vertical rotation axis.
- the head support device of the present invention is configured such that the vertical rotation shaft is perpendicular to the axial direction of the horizontal rotation shaft and the center line in the longitudinal direction of the head support arm. .
- the force of the head slider facing the recording medium corresponds to the rotation of the head support arm, and moves parallel to the surface of the recording medium. Even if the head support arm is rotated by an external force such as impact or surface vibration due to the rotation of the recording medium, the head slider moves while maintaining a state parallel to the surface of the recording medium. . For this reason, since it is possible to prevent the loss of signals during recording or reproduction as a disk device, it is possible to provide a head support device with excellent impact resistance.
- the head support device of the present invention has a structure in which the vertices of the pair of pivots forming the vertical rotation shaft are provided at positions symmetrical with respect to the longitudinal center line of the head support arm. Naru is adopted.
- the head support device of the present invention is configured such that the vertical rotation shaft passes through the rotation center of the horizontal rotation shaft. With this configuration, even when an external force is impacted in a direction perpendicular to the surface of the recording medium, the occurrence of movement of the vertical rotation shaft due to the impact can be suppressed to an extremely low level. It is possible to realize a head support device with excellent performance.
- the head support arm is integrally formed with an elastic mechanism for generating a load load.
- a part of the elastic mechanism is fixed to a head rotation arm that rotates in a direction substantially parallel to the surface of the recording medium around the center of the horizontal rotation axis.
- the head support arm is configured to be rotatable in a direction substantially parallel to the recording medium surface around the center of the horizontal rotation axis.
- the vertical rotation axial force that rotates the head support arm in a direction substantially perpendicular to the surface of the recording medium is configured to be separated from the rotation central force of the horizontal rotation axis. Yes.
- the head support arm can be reduced in size and weight.
- the head rotation arm and other members can be made of a material having extremely high rigidity, a head support device having high impact resistance and excellent resistance can be realized.
- the head slider is fixed to a gimbal mechanism having flexible elasticity for controlling the flying posture of the head slider, and the gimbal mechanism is connected to one end of the head support arm. It is structured as follows.
- the head slider can be freely supported in the roll direction and the pitch direction during recording and reproduction of the disk device, and an unnecessary tilt in the roll and pitch directions of the head slider with respect to the recording medium can be absorbed. it can.
- the disk device of the present invention is a head support having a recording medium rotated by a spindle motor, and a signal conversion element facing the recording medium and recording a signal on the recording medium or reproducing a signal from the recording medium.
- a portable electronic device of the present invention is equipped with the disk device. As a result, even when an external impact is applied to the portable electronic device, the magnetic head of the disk device does not damage the magnetic disk and does not impair the function of the portable electronic device. Play.
- the present invention enables rotation around a horizontal rotation axis in a direction parallel to the surface of the recording medium.
- the head support arm to which the head slider on which the head is mounted is connected by a gimbal mechanism having very flexible elasticity, the direction perpendicular to the surface of the recording medium with the line connecting the vertices of the pair of pivots as the vertical rotation axis Can be rotated.
- a leaf spring portion which is one of elastic mechanisms for applying a biasing force for generating a load, is provided, and among the members rotating around the vertical rotation axis, the total of the members excluding the head slider
- This is a head support device having a configuration in which the position of the center of gravity of the mass is set in the vicinity of the vertical rotation axis. By configuring such a head support arm, the head support arm can be formed to have high rigidity.
- the head support device can be rotated and positioned at a high speed, and the head slider on which the head is mounted contacts the recording medium even when an impact in the direction perpendicular to the surface of the recording medium is received from the outside. It is possible to eliminate a problem of damaging the surface of the head or the recording medium when contacting or colliding, and to realize a head support device having extremely high impact resistance.
- the head support device of the present invention it is possible to realize a disk device that is extremely excellent in impact resistance, powerful, and has a very high access speed.
- FIG. 1 is a plan view showing a main part of a magnetic disk device according to a first embodiment of the present invention.
- FIG. 2 is a plan view showing the head support device according to the first embodiment of the present invention.
- FIG. 3 is a side view showing the configuration of the head support device according to the first embodiment of the present invention.
- FIG. 4 is an exploded perspective view showing the configuration of the head support device according to the first embodiment of the present invention.
- FIG. 5 is a side view showing the positional relationship between the limiter portion of the head support arm and the gimbal mechanism as viewed from the tab portion side according to the first embodiment of the present invention.
- FIG. 6 is a diagram schematically showing a part of the head support device according to the first embodiment of the present invention.
- FIG. 7A is a conceptual schematic diagram showing an example of a relationship between an impact applied to a beam that rotates counterclockwise around a fulcrum according to Embodiment 1 of the present invention and the amount of movement of the beam.
- FIG. 7B is a conceptual schematic diagram showing another example of the relationship between the impact applied to the beam rotating counterclockwise around the fulcrum according to the first embodiment of the present invention and the amount of movement of the beam. is there.
- FIG. 8A is a conceptual schematic diagram showing an example of a relationship between an impact applied to a beam that rotates clockwise around a fulcrum according to Embodiment 1 of the present invention and a moving amount of the beam.
- FIG. 8B is a conceptual schematic diagram showing another example of the relationship between the impact applied to the beam rotating in the clockwise direction around the fulcrum according to the first embodiment of the present invention and the amount of movement of the beam. .
- FIG. 9 is a diagram showing an example of the relationship between the gravity center position ⁇ and the movement distance according to the first embodiment of the present invention.
- Fig. 10 is a diagram showing an experimental result in which the relationship between the gravity center position ⁇ and the impact acceleration that does not cause damage to the recording medium or the head slider according to the first embodiment of the present invention is obtained.
- FIG. 11 is a side view of a head support device showing another example of the configuration of the vertical rotation shaft that is used in the first embodiment of the present invention.
- FIG. 12 is a plan view showing the configuration of the head support device according to the second embodiment of the present invention.
- FIG. 13 is a side view showing the configuration of the head support device according to the second embodiment of the present invention.
- FIG. 14 is a plan view showing a head support arm according to the second embodiment of the present invention.
- FIG. 15 is a schematic diagram of the mobile phone according to the third embodiment of the present invention.
- FIG. 16 is a plan view of the main part showing the configuration of a conventional magnetic disk device.
- FIG. 17 is a perspective view of relevant parts for explaining the operation of a conventional head support device. Explanation of symbols
- FIG. 1 to 11 are diagrams for explaining a head support device and a disk device including the head support device according to the first embodiment of the present invention.
- 1 is a plan view showing the main part of the magnetic disk device
- FIG. 2 is a plan view showing the head support device
- FIG. 3 is a side view showing the configuration of the head support device
- FIG. 4 shows the configuration of the head support device.
- Fig. 5 is an exploded perspective view
- Fig. 5 is a side view showing the positional relationship between the limiter portion of the head support arm and the gimbal mechanism as seen from the tab side force
- Fig. 6 is a schematic view of a part of the head support device.
- Fig. 5 is an exploded perspective view
- Fig. 5 is a side view showing the positional relationship between the limiter portion of the head support arm and the gimbal mechanism as seen from the tab side force
- Fig. 6 is a schematic view of a part of the head support device.
- FIG. 7A is a conceptual schematic diagram showing an example of the relationship between the impact applied to the beam that rotates counterclockwise around the fulcrum and the amount of movement of the beam, and Fig. 7B that it rotates counterclockwise around the fulcrum.
- Fig. 8A is a conceptual diagram showing another example of the relationship between the impact applied to the beam and the amount of movement of the beam.
- Fig. 8A shows an example of the relationship between the impact applied to the beam that rotates clockwise around the fulcrum and the amount of movement of the beam.
- Fig. 8B is a conceptual schematic diagram showing the relationship between the impact applied to the beam rotating clockwise around the fulcrum and the amount of movement of the beam.
- Fig. 9 is a conceptual schematic diagram showing another example of the engagement.
- Fig. 9 shows the position of the center of gravity ⁇ with respect to the vertical rotation axis of the beam when subjected to impact acceleration and the maximum value of the distance the head slider moves (X)
- Fig. 10 is a diagram showing an example of the relationship between 3 max
- Fig. 10 is a diagram showing the results of an experiment to determine the relationship between the center of gravity position ⁇ and the impact acceleration that does not cause damage to the recording medium or head slider
- Fig. 11 is the configuration of the vertical rotation shaft It is a side view of a head support device showing other examples. In FIG. 1, the upper lid is removed and the upper yoke is partially omitted.
- a recording medium 4 having a recording medium layer formed on the surface is formed on a rotor hub portion 3 fixed to a rotating shaft 2 of a spindle motor (not shown) that rotates around a rotation center 1. It is placed.
- a head support device 7 which is a signal conversion element swinging arm, is pivotally supported around a rotation shaft 5 via a bearing 6.
- the head support device 7 has a configuration in which the central axis of the rotation shaft 5 can be horizontally rotated in a direction substantially parallel to the surface of the recording medium 4 with the horizontal rotation center of the head support device 7 as a center.
- the head support device 7 has a tab portion 8a formed at one end of the head support arm 8, and is a signal conversion element via a gimbal mechanism (not shown) on the rotating shaft 5 side from the tab portion 8a.
- a head slider 9 on which a magnetic head (not shown) is mounted is provided.
- a voice coil 10 is disposed at the other end of the head support arm 8 and rotates around the rotation shaft 5 in the radial direction of the recording medium 4 in a direction parallel to the surface. Further, an upper yoke 12 having a magnet 11 fixed on the opposite side of the recording medium 4 with respect to the head support device 7 provided with the voice coil 10 is provided above the voice coil 10 so as to face the voice coil 10. Installed in a chassis or other enclosure (not shown).
- the lower yoke 13 is attached to the chassis or other casing below the voice coil 10 so as to face the voice coil 10 with the voice coil 10 interposed therebetween.
- a voice coil motor (hereinafter referred to as VCM) is constituted by the voice coil 10, the magnet 11 facing the voice coil 10, the upper yoke 12 and the lower yoke 13 to which the magnet 11 is fixed.
- VCM voice coil motor
- a lamp block 15 which is a head holding member having a ramp portion 14 provided with a guide portion so that the head support device 7 is guided up and down by contacting a tab portion 8a provided in the head support device 7 is a chassis. Or it is attached to another case.
- the VCM When a current is supplied to the voice coil 10 facing the magnet 11, the VCM is operated and the head support device 7 is rotated in the radial direction of the recording medium 4. During the operation of the magnetic disk device, the head support device 7 rotates around the rotation shaft 5 and moves on the data recording area of the rotating recording medium 4. When the magnetic disk device is not operating, the head support device 7 is rotated in the clockwise direction. At this time, the head support device 7 is rotated to a predetermined position of the ramp portion 14 which is a retracted position. As is well known, in order to prevent the head support device 7 from excessively swinging in the clockwise direction or the counterclockwise direction, the crash stop 16 and the crash stop 17 are attached to the chassis or the casing or other structural members. Is provided.
- the configuration of the head support device 7 will be described with reference to FIGS. 2, 3, and 4, the head support arm 8 having the tab portion 8 a at one end and the hole portion 8 b at the other end has a magnetic head (see FIG. A head slider 9 on which (not shown) is mounted is provided.
- a dimple 8c is provided on the lower surface of the head support arm 8 so as to contact the vicinity of the center portion of the head slider 9, and the head slider 9 is attached to the head support arm 8 via the gimbal mechanism 21. /!
- the magnetic disk device Since the dimple 8c is brought into contact with the substantially central portion of the upper surface of the gimbal mechanism 21 or the head slider 9 (the surface opposite to the surface on which the magnetic head is mounted), the magnetic disk device It is possible to flexibly follow unnecessary vibrations in the roll or pitch direction of the head slider 9 with respect to the recording medium 4 during the operation of. Further, when the head support device 7 is unloaded, the head slider 9 fixed to the gimbal mechanism 21 due to the negative pressure received by the head slider 9 is greatly separated from the dimple 8c of the head support arm 8 to deform the gimbal mechanism 21. To prevent.
- a limiter portion 8d is provided in the head support arm 8 so as to have a predetermined gap d with the gimbal mechanism 21 to which the head slider 9 is fixed.
- the limiter portion 8d is brought into contact with the gimbal mechanism 21 to regulate the separation distance of the gimbal mechanism 21 from the dimple 8c.
- the voice coil 10 is attached to a voice coil holder 22 having a hole 22a.
- a voice coil portion 24 having a balancer 23 fixed to the opposite side of the hole portion 22a across the voice coil 10 is fixed to the head support arm 8.
- the head support arm 8 and the voice coil unit 24 are illustrated as separate members. However, it is not limited to this, and these can be combined into one unit. Further, the «Lancer 23 does not have to be provided as a separate member.
- the outer shape of the voice coil holder 22 may be increased to add a balance adjustment function to the voice coil holder 22.
- One end of a substantially annular leaf spring portion 25, which is one of the elastic mechanisms, is fixed to the lower surface of the head support arm 8 (the surface on which the slider 9 is disposed).
- the other side upper surface A substantially semi-annular spring fixing member 26 is fixed to the surface on the side fixed to the head support arm 8.
- FIG. 4 is an exploded perspective view of the support device 7.
- the pivot bearing 27 has a pair of bibotts 27a and 27b at both ends thereof, and a hole 27c at the center thereof.
- the bearing portion 28 includes a flange 28a and a screw portion 28b. Further, a cylindrical portion 28c is provided between the flange 28a and the screw portion 28b.
- the external appearance of the bearing portion 28 is a cylindrical shape with a hollow collar.
- the outer diameter of the flange 28a is larger than the inner diameter of the hole portion 27c, and the outer diameter of the screw portion 28b is smaller than the inner diameter of the hole portion 27c.
- the cylindrical portion 28c has an outer diameter large enough to fit into the hole portion 27c.
- the bearing 28 is passed through the hole 27c of the pivot bearing 27, the inside of the semi-annular spring fixing member 26, the inside of the annular leaf spring 25, and the hole 22a of the voice coil holder 22.
- the voice coil unit 24 is attached to the voice coil holder 22 having the hole 22a! /.
- the voice coil 10 is fixed to a head support arm 8 having a balancer 23 fixed to the opposite side of the hole 22a.
- the hollow collar 29 is inserted from the opposite side of the flange 28a by being fitted into the cylindrical portion 28c of the bearing portion 28 so that the protruding portion 29a is on the flange 28a side of the bearing portion 28.
- the hollow collar 29 has an inner diameter that fits into the cylindrical portion 28 c and an outer diameter that passes through the hole portion 22 a of the voice coil holder 22. Further, the collar 29 is provided with a semi-annular projecting portion 29a having a shape substantially similar to that of the spring fixing member 26 fixed to the substantially annular leaf spring portion 25.
- the upper surface 29b of the projecting portion 29a abuts on a substantially semi-annular plane portion of the spring fixing member 26 fixed to the leaf spring portion 25.
- the collar 29 is integrated by sandwiching the collar 29 with the flange 28a of the bearing 28 and the nut 30 together with the flat portion of the spring fixing member 26 and the flat portion of the leaf spring portion 25 to which the spring fixing member 26 is fixedly abutting.
- the support device 7 is configured.
- the leaf spring portion 25 fixed to the head support arm 8 via the collar 29 and the spring fixing member 26 is sandwiched between the flange 28 a of the bearing portion 28 and the nut 30.
- the apexes of the pair of pivots 27a and 27b provided on the pivot bearing portion 27 abut on the upper surface of the head support arm 8 (the surface on the side where the head slider 9 is disposed).
- the head support arm 8 and the pivot bearing portion 27 are inertially connected by a leaf spring portion 25, which is one of elastic mechanisms, via the leaf spring portion 25 and a pair of pivots 27a and 27b. With such a configuration, the head support arm 8 is pivoted using the lines connecting the contact points P and P of the pair of pivots 27a and 27b of the pivot bearing 27 and the upper surface of the head support arm 8 as fulcrums.
- the leaf spring portion 25 acts so that the tab portion 8a side is pushed downward.
- the head support arm 8 uses the line connecting the contact points P and P as the vertical rotation axis 31.
- the recording medium 4 can be rotated in a direction perpendicular to the surface of the recording medium 4. Therefore, during operation of the magnetic disk device, the head slider 9 attached to the head support arm 8 via the gimbal mechanism 21 floats with respect to the surface of the recording medium 4.
- the load load of the head slider 9 is such that the leaf spring portion 25 of the pair of pivots 27a and 27b of the pivot bearing 27 contacts the head support arm 8 by the contact points P and P respectively.
- the head slider 9 floats due to the relationship between the urging force in the direction of the recording medium 4 acting on the head slider 9 and the levitation force in the opposite direction. Recording / reproduction of the magnetic disk device is performed while maintaining a certain gap between the head slider 9, that is, the magnetic head and the recording medium 4.
- the head support device 7 shown in FIG. 1 is formed so as to be perpendicular to the center line 18 in the longitudinal direction.
- the contact point P and the contact point P are symmetrical with respect to the axis of the rotation shaft 5 of the head support device 7.
- the head support arm 8 that constitutes the head support device 7 moves along the line connecting the contact point P and the contact point P of the pivot 27a and the pivot 27b.
- the head slider 9 mounted on the head support arm 8 is urged toward the recording medium 4 by the elastic force of the leaf spring portion 25.
- the head support device 7 is configured.
- the head support arm 8 can be made of a highly rigid material. Since it is possible to improve the impact resistance against a large impact from the outside, the resonance frequency of the head support arm 8 can be increased.
- the head support device 7 can be rotated and positioned at high speed.
- the access speed of the magnetic disk device can be improved.
- the leaf spring portion 25, which is one of the elastic mechanisms is provided as a separate member independent of the head support arm 8, which is not integrally formed as a single member as the head support arm 8. For this reason, the contradictory conditions of increasing the load load on the head slider 9, increasing the flexibility, and increasing the rigidity of the structure can be satisfied all at once. As a result, the design of the head support device 7 can be simplified, and the design freedom can be dramatically expanded.
- the leaf spring portion 25 it is necessary to form the leaf spring portion with a very high precision.
- the head support arm can be formed relatively easily.
- the thickness, material, etc. of the leaf spring portion 25 can be set independently, the strength and spring constant of the leaf spring portion 25 can be set to a desired size.
- the head support arm 8 constituting the head support device 7, the voice coil portion 25 and the leaf spring portion 25, the portion in contact with the head support arm 8, the head slider 9 is fixed, and the head support arm 8 is fixed.
- the weight (weight) of the balancer 23 is adjusted so that the total center of gravity of the gimbal mechanism 21 and the balancer 23 is connected to a predetermined position, and the balancer 23 is connected to one end of the voice coil holder 22 constituting the voice coil unit 24. Secure 23.
- the balancer 23 is fixed to one end of the voice coil holder 22.
- the head support device 7 configured as described above receives an impact in the axial direction of the rotating shaft 5 (the direction perpendicular to the surface of the recording medium 4) that is the external force horizontal rotation axis.
- the behavior of the head support arm 8 and the head slider 9 at this time will be described with reference to FIG.
- the apex 61a of the fulcrum 61 connects the contact points P and P of the pair of pivots 27a and 27b of the pivot bearing 27 and the upper surface of the head support arm 8 shown in FIG.
- the beam 62 is a portion held by a leaf spring portion 25 which is an elastic mechanism excluding the head slider 9. That is, the head support arm 8, the voice coil holder 22, the leaf spring portion 25 of the head support device 7 shown in FIG.
- the beam portion 62a, the voice coil 10 and the balancer 23 are integrated together, and a member 62b and a force.
- the beam 62 has a projection 62c corresponding to the dimple 8c of the head support arm 8 shown in FIG. 3, and is in contact with the head slider 9.
- the spring 63 is a model of the gimbal mechanism 21 made of a very flexible material. The elastic force of a portion connecting the portion fixed to the head support arm 8 and the portion fixed to the head slider 9 is shown. Normally, the head slider 9 is in contact with the dimple 8c through the gimbal mechanism 21 with a very small preload.
- the spring 64 indicates a differential pressure between a positive pressure and a negative pressure generated in the head slider 9 by the rotation of the recording medium 4, that is, a flying force generated in the head slider 9.
- the spring 65 indicates the elastic force of the leaf spring portion 25 for applying a load load to the head slider 9.
- the load load by the spring portion 65 balances with the flying force indicated by the spring 64, and the recording medium 4 force is also lifted.
- the total mass of the beam 62 is m
- the center of gravity is point A
- the mass of the beam 62 on the head slider 9 side from the apex 6 la of the fulcrum 61 is m
- the head slider 9 side from the fulcrum 61 is the head slider 9 side.
- the mass of the beam 62 on the opposite side is indicated by m
- the mass of the head slider 9 is indicated by m.
- the head slider 9 is subjected to an impact in a direction 66 indicated by an arrow.
- negative pressure and positive pressure are generated by the rotation of the recording medium 4, the movement of the beam 62 and the behavior of the head slider 9 connected to the beam 62 by the very flexible spring 63 are indispensable. None of them match perfectly.
- the head slider 9 floats on the recording medium 4 due to the balance between the load load and the flying force, the flying becomes unstable if the balance is largely lost. If a strong impact that eliminates the load load is applied from the outside, the head slider 9 will rise according to the magnitude of the flying force and will become very unstable. By suppressing the fluctuation of the load load due to the external force, the flying of the head slider 9 can be stably maintained.
- the behavior of the beam 62 and the behavior of the head slider 9 can be considered separately.
- a rotational moment is applied so that the beam 62 rotates around the fulcrum 61.
- the direction of the rotational moment for rotating the beam 62 is determined by the direction of the impact force acting on the beam 62 and the center of gravity position A of the beam 62 with respect to the fulcrum 61.
- 7A, 7B, 8A, and 8B show schematic diagrams for each combination of the direction in which the impact force acts on beam 62 and the position of the center of gravity of beam 62, respectively.
- FIG. 7A shows a state where the gravity center position A of the beam 62 with respect to the fulcrum 61 is on the head slider 9 side.
- the case is shown where the impact force is perpendicular to the beam 62 and in the direction from the beam 62 side to the slider 9 side.
- the gravity center position A of the beam 62 with respect to the fulcrum 61 is on the member 62b side (the opposite side to the head slider 9 side).
- each behavior of the beam 62 is counterclockwise around the vertex 61a of the fulcrum 61.
- the head slider 9 rotates in the direction, that is, the direction in which the head slider 9 approaches the recording medium 4.
- FIG. 8A shows that the center of gravity A of the beam 62 with respect to the fulcrum 61 is on the member 62b side (opposite to the head slider 9 side), perpendicular to the beam 62, and from the beam 62 side to the slider 9 side. The case where the impact force of the direction is received is shown.
- the gravity center position A of the beam 62 with respect to the fulcrum 61 is on the head slider 9 side.
- it shows the case perpendicular to the beam 62 and receiving an impact force in the direction from the slider 9 side to the beam 62 side.
- Each behavior of the beam 62 is rotated around the apex 61a of the fulcrum 61 in the clockwise direction, that is, in the direction in which the head slider 9 also separates the recording medium 4 force.
- the impact force of the external force acts on the center of gravity of the beam 62 and also acts on the center of the head slider 9.
- the direction of the impact force acting on the head slider 9 differs between when the impact force is applied from the beam 62 side to the slider 9 side and when the impact force is applied from the slider 9 side to the beam 62 side.
- k Spring constant of spring 72 (gimbal mechanism connecting head slider 9 and beam 62)
- ⁇ , ((t), 0 and X are defined as follows. That is, ⁇ is the beam 6
- the vertex 61a of the fulcrum 61 is the origin, the head slider side is positive (+), and the member 62b side is negative (-).
- the direction from the beam 62 side to the slider 9 side is positive (+), and the direction from the slider 9 side to the beam 62 side is negative (-).
- ⁇ is positive (+) in the counterclockwise direction and negative (one) in the clockwise direction with the vertex 61a of the fulcrum 61 as the rotation center.
- X is positive (+) on the side opposite to the beam 62 side (recording medium 4 side) and negative on the beam 62 side (one
- equations of motion of the beam 62 and the head slider 9 are expressed by equations (3) and (4).
- equation (3-1) is obtained.
- Equation (6-1) Equation (6-1) is obtained.
- Expression 7b is expressed by Expression (7-1).
- equation (7-2) By using equation (7-2), the normal operating position of the head slider 9 and the position of the head slider 9 when the external force is applied to the beam 62 and the head slider 9 can be obtained. .
- equations (7-2), (7a), (7b), (7c), (7d) and the equation (6a) ( ⁇ > 0, ⁇ > 0) is shown in FIG. 0) corresponds to Fig. 7 (b), ( ⁇ 0, a> 0) corresponds to Fig. 8A, and ( ⁇ > 0, ⁇ ⁇ 0) corresponds to Fig. 8 (b).
- equation (8-1) if t is the time t when X (t) reaches the maximum value (X), equation (8-1)
- Equation (8-1) are functions of distance ⁇ , ⁇ and A, respectively.
- equation (8-1) can be expressed as equation (9-1) as a function of ⁇ .
- the direction of rotation of the beam 62 is determined by the direction in which the force is applied and the direction of the center of gravity ⁇ with respect to the vertical rotation axis (Figs. 7 ⁇ , 7 ⁇ , 8 ⁇ and 8 ⁇ ). Therefore, in FIG. 9, in the respective regions on the positive (+) side and the negative (one) side of the important subject position ⁇ , the rotation direction of the beam 62 includes the + side and the side.
- the flying distance between the ABS surface of the head slider 9 and the surface of the recording medium 4 when the magnetic disk device is operating normally is caused by surface fluctuations due to rotation of the recording medium 4 and manufacturing variations. Or the ambient environment (for example, atmospheric pressure).
- the flying height is guaranteed to assure stable flying without causing trouble due to contact between the head slider 9 and the recording medium 4. A value called “Glide Height” is determined.
- the maximum allowable displacement amount of X that is allowed is the amount obtained by subtracting the above-described fluctuation amount and the amount of the dalide height from the flying height.
- the movement amount (X) of the head slider 9 is maximum.
- Equation (9-4) When the relationship between Equation (9-4) and Equation (9-5) holds, within the region of the center of gravity position ⁇ represented by Equation (9 6-1) and Equation (9 6-2) In addition, the center of gravity position ⁇ ⁇ of the member that removes the head slider from the members that rotate around the vertical rotation axis is set.
- the external force equation (9-7) shows Even under impact, the head slider 9 remains on the recording medium 4. There is no contact. That is, the allowable maximum impact acceleration a (t) is set, and the area of ⁇ is obtained using the design specifications of each element as in the above example, and the center of gravity position ⁇ of the beam 62 is determined as the area of the center position ⁇ . Set to be located within.
- the head slider 9 can be suppressed to the maximum allowable displacement amount X or less. For this reason, the head slider 9
- FIG. 10 shows a head support device in which the center-of-gravity position ⁇ of the member corresponding to the beam 62 (that is, the member rotating around the vertical rotation shaft 31 excluding the head slider 9) is changed.
- the impact acceleration applied is changed and dropped in the direction perpendicular to the recording medium 4, at least one of the recording medium 4 and the head slider 9 will not be damaged! It is the examination result which calculated
- the horizontal axis in FIG. 10 is the same as that shown in FIG. 9, and indicates the position of the center of gravity with respect to the vertex 61a of the total mass of the beam 62.
- the vertical axis shows the maximum value of the drop impact acceleration without causing damage to at least one of the recording medium 4 and the head slider 9!
- the curve 101 of the maximum value of the drop impact acceleration that does not cause damage to the recording medium 4 or the head slider 9 with respect to the center of gravity position ⁇ is a convex curve that is directed upward.
- a force that causes the center of gravity of the total mass (m) of only the beam 62 to substantially coincide with the apex 61a, rather than making the position substantially coincide with the apex 61a.Damage is caused to at least one of the recording medium 4 and the head slider 9. It suggests that the maximum value of impact acceleration that does not occur can be obtained, and that it can withstand a greater drop impact. That is, from the viewpoint of impact resistance, when considering the position of the center of gravity of the total mass of the members that rotate around the apex 61a of the fulcrum 61, the beam 62 and the head slider 9 It can be inferred from the results of the study shown in Fig. 10 that a more rational approach can be made than the force considered by separating each mass.
- the head slider 9 is arranged around the vertical rotation axis.
- the force between the center of gravity position A of the members except the head slider and the apex 61a of the fulcrum 61 is ⁇ , and the force of formula (9-1) is also derived for the maximum allowable displacement X.
- Expression (10-1) In order to obtain Expression (10-1), first, a straight line represented by Expression (11) is obtained.
- Equation (11 1) can be solved for the center of gravity position ⁇ ⁇ ⁇ .
- ⁇ + is the position of the center of gravity when the rotation direction of the beam 62 is positive (+) and ⁇ is positive (+)
- ⁇ + is the position of the center of gravity when the rotation direction of the beam 62 is positive (+) and ⁇ is negative (-)
- ⁇ is the position of the center of gravity when the rotation direction of the beam 62 is negative (one) and ⁇ is positive (+)
- ⁇ - is the position of the center of gravity when the rotation direction of the beam 62 is negative (-) and ⁇ is negative (-)
- ⁇ + ⁇ + ⁇ — and ⁇ ⁇ are respectively expressed by the equations (12-1 (12-2 (12-3)) and
- the head slider 9 will come into contact with the recording medium 4 even if it receives an impact with an impact acceleration less than or equal to the maximum allowable impact acceleration ex (t). It can be prevented. As a result, it is possible to prevent the head slider 9 and the recording medium 4 from being damaged.
- the members excluding the head slider 9, that is, the head support arm 8, the voice coil portion 24, the leaf spring portion 25, the portion in contact with the head support arm 8, the gimbal mechanism 21 and the balancer The center of gravity position of the total mass of 23 is set with respect to the line connecting the contact points P and P of the pair of pivots 27a and 27b provided on the pivot bearing 27 contacting the upper surface of the head support arm 8, that is, the vertical rotation shaft 31. , In the vicinity of its vertical pivot 31
- the center-of-gravity position of the member rotating around the vertical rotation axis 31 including 9 is an area ⁇ represented by the equation (14) with respect to the vertical rotation axis 31.
- the one in which the apexes of the pair of pivots 27a and 27b provided on the pivot bearing 27 are in contact with the upper surface of the head support arm 8 is exemplified.
- the present invention is not limited to this.
- the apexes of the pivots 11 la and 11 lb provided on the head support arm 111 are in contact with the lower surface of the flange 112a of the bearing 112. It's also good.
- the pivot 11 la and the pivot 11 lb are the flange 1 of the bearing 112.
- Each contact point Q that contacts the lower surface of 12a and the contact point Q are the axes of the rotating shaft 5 (not shown)
- a line connecting 1 2, that is, a vertical rotation axis passes through the axis of the rotation axis 5 and is perpendicular to the longitudinal center line of the head support arm 111.
- contact point Q
- the head support arm constituting the head support device can be formed of a rigid high-strength material, it is possible to improve the impact resistance against a large impact or the like of an external force. Is possible.
- the resonance frequency of the head support arm can be increased, the vibration mode that has been problematic in the past does not occur, and no settling operation is required, so the head support device can be rotated and positioned at high speed. Can do.
- the leaf spring portion which is one of the elastic mechanisms, was provided as a separate member independent of the head support arm. For this reason, the load applied to the head slider can be set to a predetermined size relatively easily, and the degree of design freedom can be increased.
- the head support arm can be rotated around the line connecting 2 (vertical rotation axis).
- a member that rotates around a vertical rotation axis that is, a head support arm, a voice coil portion, a portion that contacts the head support arm, a gimbal mechanism, and a head fixed to the gimbal mechanism.
- the position of the center of gravity of the other members excluding the head slider is set near the vertical rotation axis. This prevents the head slider from colliding with the recording medium and damaging the surface of the recording medium even if it is subjected to a large external force, and prevents the head from having a very high impact resistance.
- a device can be realized.
- the head support device configured as described above for a magnetic disk device, it is possible to realize a magnetic disk device that has very high impact resistance and a very high access speed.
- FIGS. 12 to 14 are diagrams for explaining the head support device according to the second embodiment of the present invention.
- FIG. 12 is a plan view showing the configuration of the head support device
- FIG. 13 is a side view showing the configuration of the head support device
- FIG. 14 is a plan view showing the head support arm in the head support device. 12 and 13, elements corresponding to those in FIGS. 2 and 3 used in the first embodiment are denoted by the same reference numerals as those in FIGS.
- the head support device 120 is a head in which a head slider 9 on which a magnetic head (not shown) is mounted via a gimbal mechanism 21 at one end portion.
- the support arm 121 is provided with a leaf spring portion 121a.
- a fixing portion 121b connected to the plate panel portion 121a is fixed to the head rotating arm 122.
- the apexes of the pair of pivots 121c and 121d provided on the head support arm 121 are in contact with the lower surface (the surface on the recording medium 4 side) of the head rotation arm 122, respectively.
- the head support arm 121 and the head rotating arm 122 are inertially connected by a leaf spring portion 12 la which is one of elastic mechanisms through the leaf spring portion 121a and a pair of pivots 121c and 121d.
- the head rotating arm 122 is provided with a bearing portion 123 in which the bearing 6 is incorporated on the side opposite to the side on which the head support arm 121 is fixed.
- the head turning arm 122 and the bearing portion 123 may be formed integrally.
- the voice coil section 24 configured by attaching the voice coil 10 to the voice coil holder 22 is located on the opposite side of the head support arm 121 with the bearing section 123 fixed to the head rotating arm 122 interposed therebetween. It is fixed to the head rotating arm 122.
- a head support device 120 is provided by arranging a head support arm 121 having a head slider 9 and a voice coil unit 24 via a gimbal mechanism 21 on a head rotating arm 122 to which a bearing portion 123 is fixed. Is configured. Further, the head support device 120 is pivotally supported by the bearing 6 so as to be rotatable around the rotation shaft 5 in the horizontal direction.
- Embodiment 2 is configured to be horizontally rotatable in the direction of a plane substantially parallel to the surface of recording medium 4 with the central axis of rotation shaft 5 as the horizontal rotation center. Become. By supplying current to the voice coil 10, the VCM is activated and the head support device 120 is rotated in the radial direction of the recording medium 4.
- the head rotating arm 122 and the voice coil unit 24 may be configured as separate members, or may be a single unit in which they are integrated.
- the head support arm 121 will be described with reference to FIG.
- the head support arm 121 is formed of a non-magnetic metal thin plate material by a well-known technique such as press carriage or etching carriage, and the surface shape thereof has an outer shape of a substantially isosceles triangle.
- Bending portions 141 are formed on both side surfaces corresponding to both side slopes of the substantially isosceles triangle in the longitudinal direction, respectively, to increase the rigidity of the head support arm 121 in the longitudinal direction. Then, a U-shaped slit portion 142 is formed at the center of the portion sandwiched between the bent portions 141 formed on both sides. Further, a substantially rectangular cut portion 143 is formed in the tongue-shaped interior located inside the slit portion 142. A portion between the side surfaces 143a and 143b of the cut portion 143 and the slit portion 142 constitutes a leaf spring portion 121a.
- a portion between the side surface 143c and the slit portion 142 sandwiched between both side surfaces 143a and 143b of the cutout portion 143 constitutes a fixing portion 121b for adhering to the head rotating arm 122.
- the head support arm 121 includes both side surfaces 143a and 143b of the cut portion 143 and the respective slit portions 142 opposed to the cut portions 143, and is located on the longitudinal center line 144 of the head support arm 121.
- Pivots 121c and 121d are formed at symmetrical positions. The pivots 121c and 121d are formed by projecting to the side opposite to the side to which the head slider 9 is fixed via the gimbal mechanism 21 (not shown in FIG. 14)! Speak.
- the dimple 121 e is provided on the lower surface of the head support arm 121 so as to contact the vicinity of the central portion of the head slider 9.
- the dimple 121e is attached to the upper surface of the gimbal mechanism 21 or the head slider 9 (the surface opposite to the surface on which the magnetic head is mounted). It makes it contact
- it has a predetermined gap d with the gimbal mechanism 21 to which the head slider 9 is fixed.
- the head support arm 121 is provided with a limiter 121f.
- the limiter 121f is Similar to the first embodiment, the distance between the gimbal mechanism 21 and the dimple 121e is controlled by contact.
- the mass (weight) of the balancer 124 so that the total center of gravity of the head support arm 121, the gimbal mechanism 21 and the balancer 124 excluding the leaf spring part 121a and the fixed part 121b of the head support arm 121 is a predetermined position.
- the balancer 124 is fixed to one end of the head support arm 121.
- the balancer 124 is fixed to the head slider 9 side of the head support arm 121. However, it is not limited to this. If it is fixed at the position of the head support arm 121 so that the total center of gravity position of the mass becomes a predetermined position, it is sufficient.
- the fixing portion 121b of the head support arm 121 is fixed to one end side of the head rotation arm 122, and the apexes of the pair of pivots 121c and 121d provided on the head support arm 121 are Each is brought into contact with the lower surface of the head rotation arm 122.
- the head support arm 121 and the head rotating arm 12 2 are inertially connected by the leaf spring portion 12 la which is one of the elastic mechanisms through the leaf spring portion 121a and the pair of pivots 12 lc and 12 Id. .
- the head support arm 121 rotates around a line connecting the contact points R and R between the pair of pivots 121c and 121d of the head support arm 121 and the lower surface of the head rotation arm 122.
- the head support arm 121 is perpendicular to the surface of the recording medium 4 with the line connecting the contact points R and R as the vertical rotation axis 12 lg (see FIG. 12).
- the head support arm 121 is formed with a line connecting the contact points R and R of the pair of pivots 121c and 121d of the head support arm 121 and the lower surface of the head rotation arm 122 as fulcrums.
- the structure in which the head support arm 121 is rotated by the elastic force of the leaf spring portion 121a so that the side on which the head slider 9 is fixed is pushed downward (the direction toward the recording medium 4) is the same as in the first embodiment. It is.
- the side of the head support arm 121 to which the head slider 9 is fixed is pushed downward by the leaf spring portion 121a of the head support arm 121.
- the end of the head support arm 121 opposite to the side on which the head slider 9 is attached contacts the lower surface of the head rotation arm 122 to interfere with the rotation of the head support arm 121.
- a recess 122a is formed in a region including the outer shape of the end of the head support arm 121.
- the recess 122a is not limited to the recess and may be a through hole. Therefore, in the second embodiment, as in the first embodiment, the head slider 9 attached to the head support arm 121 via the gimbal mechanism 21 is the surface of the recording medium 4 during the operation of the magnetic disk device. To surface.
- the load on the head slider 9 at this time is determined by the head support at the contact points R and R of the pair of pivots 121c and 121d of the head rotation arm 122 and the head support arm 121.
- the head slider 9 is lifted by the relationship between the urging force in the four directions of the recording medium applied to the head slider 9 and the levitation force in the opposite direction, and a certain gap is maintained between the head slider 9, ie, the magnetic head and the recording medium 4. Recording and playback of the magnetic disk device is performed.
- the load load on the recording medium 4 of the head slider 9 is applied to each of the pair of pivots 121c and 121d of the head rotation arm 122 and the head support arm 121.
- Head support arm with contact R and R 121 is configured as described above.
- the load applied to the recording medium 4 can be set to a predetermined value according to the protruding height of the pair of pivots 121c and 121d formed on the head support arm 121 and the elastic coefficient of the leaf spring portion 121a.
- a part of the tip side of the head rotating arm 122 is connected to the head rotating arm 122 by a leaf spring 121a, and a pair of pivots 121c and 121d are connected to the head rotating arm 122.
- the head support arm 121 to which the head slider 9 is fixed via the gimbal mechanism 21 rotates in a direction perpendicular to the surface of the recording medium 4.
- the total mass of the head support arm 121, the gimbal mechanism 21, the head slider 9, and the balancer 124 for setting the total center of gravity position to a predetermined position can be reduced.
- the impact force applied to the head support arm 121 when an impact in a direction perpendicular to the surface of the recording medium 4 is applied can be made extremely small. Furthermore, the total mass of the head support arm 121, the gimbal mechanism 21 and the balancer 124 is reduced, and the center of gravity position is set to the vertical rotation shaft 121g (one of the head rotation arm 122 and the head support arm 121). (The line connecting the respective contact points R and R with the pair of pivots 121c and 121d)
- the rotational moment for turning the head support arm 121 can be reduced. Further, the impact resistance against the impact in the direction perpendicular to the surface of the recording medium 4 can be greatly enhanced.
- the leaf spring portion 121a that is one of the elastic mechanisms from the vertical rotation shaft 121g.
- the portion held by the head slider 9 excluding the head slider 9 that is, the distance to the center of gravity of the total mass of the head support arm 121, gimbal mechanism 21 and balancer 1 24 excluding the leaf spring portion 121a and the fixing portion 121b.
- the related rotational moment works.
- the load load applied by the leaf spring portion 121 a provided on the head support arm 121 varies.
- the head support arm 121 is connected to the head support arm 121 by the behavior of the head support arm 121 and a very flexible gimbal mechanism 21.
- the behavior of the head slider 9 is not completely consistent.
- the flying of the head slider 9 is stabilized by at least suppressing the fluctuation of the load load due to the external force.
- the contents described with reference to FIGS. 6 to 8 in the first embodiment can also be applied to the head support arm 121 in the second embodiment.
- the portion excluding the head slider 9 among the portions held by the leaf spring portion 121a which is one of the elastic mechanisms acting on the second embodiment, that is, the head excluding the leaf spring portion 121a and the fixing portion 121b.
- the support arm 121, the gimbal mechanism 21, and the balancer 124 correspond to the beam 62 described in the first embodiment.
- the total mass m of the beam 62 in the second embodiment is the leaf spring 121 that is one of the elastic mechanisms.
- the total mass of the portion excluding the head slider 9, that is, the head support arm 121, the gimbal mechanism 21, and the balancer 124 excluding the leaf spring portion 121a and the fixing portion 121b is shown.
- the motion equation of the head slider 9 excluding the head slider 9 and the head slider 9 among the portions held by the leaf spring portion 121a, which is one of the elastic mechanisms, is the motion equation in the first embodiment. It can be expressed by the same equation. That is, they are represented by formula (3) and formula (4), respectively. Other symbols and symbols similar to those in Embodiment 1 can be used.
- the pair of pivots 121c and 121d are provided on the head support arm 121, and the apexes of the pivots 121c and 121d are in contact with the lower surface of the head rotating arm 122.
- the present invention is not limited to this.
- a pair of pivots may be provided on the head rotating arm, and the tops of the pair of pivots may be in contact with the upper surface of the head support arm 121. .
- the leaf spring portion 121a is formed integrally with the head support arm 121.
- the leaf spring portion 121a may be configured by a member different from the head support arm 121.
- the head support arm 121 and the leaf spring part 121a are made of a highly rigid material, and the leaf spring part 121a is made of a highly flexible and elastic material. It can be formed, and the degree of freedom of design can be greatly expanded.
- the head support device of the magnetic disk device using the magnetic head has been described.
- the head support device of the present invention has the same effect when used as a head support device for a non-contact type disk device such as an optical disk device or a magneto-optical disk device.
- the head support arm constituting the head support device can be reduced in weight.
- it can be formed to increase rigidity. It is possible to improve the impact resistance against an impact with a large external force and to rotate and position the head support device at high speed.
- the head support arm can be rotated around a line connecting two lines (that is, a vertical rotation axis), and is held by a plate spring portion 121a that is a member that rotates around the vertical rotation axis, that is, an elastic mechanism. Set the center of gravity of the total mass of the parts excluding the head slider 9 in the vicinity of the vertical rotation axis. Even when a large impact is applied from the outside, if the head slider collides with the recording medium and damages the surface of the recording medium, the head has a very high impact resistance, eliminating defects. A support device can be realized.
- the magnetic disk is very excellent in impact resistance and has a very high access speed.
- An apparatus can be realized.
- a mobile phone that is one of the portable electronic devices according to the third embodiment of the present invention will be described with reference to FIG.
- a magnetic disk device 151 is disposed below the substrate 152, and a liquid crystal display 153, a speaker 154, and a microphone 155 are disposed above the substrate 152.
- the substrate 152 is housed in a casing composed of a lower case 156 and an upper case 157, and constitutes a mobile phone 150.
- the magnetic disk 151 is a magnetic disk device having the head support device described in the first embodiment or the second embodiment, and thus detailed description thereof is omitted.
- Magnetic disk unit 151 Since, for example, as shown in Embodiment 1, it has high impact resistance, it does not require a cushioning material or the like when mounted on the mobile phone 150, and the mobile phone mounted with the magnetic disk device is not required. Miniaturization can be achieved.
- the magnetic disk is disposed on the back side of the liquid crystal display 153 with the substrate 151 interposed therebetween.
- the location of the magnetic disk device 151 is not limited to this, and it has high impact resistance even at any location.
- a mobile phone is exemplified as the portable electronic device.
- portable electronic devices such as notebook personal computers and portable information terminals such as PDAs, movies and cameras that store video and music, and music players that require high-capacity recording devices High impact resistance.
- the present invention is capable of rotating around a horizontal rotation axis in a direction parallel to the surface of the recording medium, and the head slider on which the head is mounted has a very flexible elasticity.
- Elasticity that enables the head support arm connected by the mechanism to rotate in the direction perpendicular to the surface of the recording medium with the line connecting the vertices of the pair of pivots as the vertical rotation axis, and to apply the urging force for load generation It is a head support device having a configuration in which a leaf spring portion as a mechanism is provided.
- the head support arm can be formed to have high rigidity. It is possible to improve impact resistance against large impacts from external forces.
- the resonance frequency of the head support arm can be increased, and the head support device can be rotated and positioned at a high speed.
- the center of gravity of the total mass of the members excluding the head slider is set in the vicinity of the vertical rotating shaft. Even when an impact in the direction perpendicular to the surface of the recording medium is received from the outside, the head slider equipped with the head records. There is an effect that it is possible to realize a head support device having a very large impact resistance without causing damage to the surface of the recording medium by abutting or colliding with the medium.
- the present invention is useful for a magnetic disk device and a non-contact type disk device such as a head support device used in an optical disk device, a magneto-optical disk device, and the like.
- a magnetic disk device or a non-contact type disk device equipped with the head support device of the present invention for example, an optical disk device or a magneto-optical disk device, in a portable electronic device, a portable electronic device. Since the device can have high impact resistance, its industrial applicability is high.
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- Supporting Of Heads In Record-Carrier Devices (AREA)
Abstract
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
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US11/794,681 US7804665B2 (en) | 2005-01-05 | 2005-12-27 | Head support device, disk device having the head support device, and portable electronic device having the disk device |
JP2006550787A JP4492615B2 (ja) | 2005-01-05 | 2005-12-27 | ヘッド支持装置及びそれを備えたディスク装置及びそれを備えた携帯用電子機器 |
CN2005800458729A CN101095193B (zh) | 2005-01-05 | 2005-12-27 | 头支承装置及具备其的盘装置及具备其的便携用电子设备 |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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JP2005-000397 | 2005-01-05 | ||
JP2005000397 | 2005-01-05 |
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WO2006073086A1 true WO2006073086A1 (ja) | 2006-07-13 |
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ID=36647568
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Application Number | Title | Priority Date | Filing Date |
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PCT/JP2005/023876 WO2006073086A1 (ja) | 2005-01-05 | 2005-12-27 | ヘッド支持装置及びそれを備えたディスク装置及びそれを備えた携帯用電子機器 |
Country Status (4)
Country | Link |
---|---|
US (1) | US7804665B2 (ja) |
JP (1) | JP4492615B2 (ja) |
CN (1) | CN101095193B (ja) |
WO (1) | WO2006073086A1 (ja) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US8169743B2 (en) * | 2007-07-20 | 2012-05-01 | Hitachi Global Storage Technologies, Netherlands B.V. | Minimizing slider vibration effects on a magnetic transducer |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
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JP3374846B2 (ja) * | 2001-02-13 | 2003-02-10 | 松下電器産業株式会社 | ヘッド支持装置 |
JP2003069671A (ja) * | 2001-08-29 | 2003-03-07 | Matsushita Electric Ind Co Ltd | 携帯電話機 |
JP2004071089A (ja) * | 2002-08-08 | 2004-03-04 | Matsushita Electric Ind Co Ltd | ヘッド支持アーム、ヘッド支持装置およびディスク装置 |
JP2004087101A (ja) * | 2002-08-07 | 2004-03-18 | Matsushita Electric Ind Co Ltd | ヘッド支持装置、ヘッド駆動装置およびディスク装置 |
JP2004139717A (ja) * | 2002-09-27 | 2004-05-13 | Matsushita Electric Ind Co Ltd | ヘッド支持装置およびこれを用いたディスク装置 |
Family Cites Families (13)
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US5745319A (en) | 1992-08-12 | 1998-04-28 | Kabushiki Kaisha Toshiba | Recording/reproducing apparatus with coarse and fine head positioning actuators and an elastic head gimbal |
JPH06259905A (ja) | 1993-03-03 | 1994-09-16 | Toshiba Corp | 記録再生装置用アクチュエータ及びこれを用いた記録再生装置 |
SG43433A1 (en) | 1995-10-27 | 1997-10-17 | Tdk Corp | Suspension slider-suspension assmebly assembly carriage device and manufacturing method of the suspension |
JP2894262B2 (ja) | 1995-10-27 | 1999-05-24 | ティーディーケイ株式会社 | サスペンション装置、スライダ−サスペンションアセンブリ及びアセンブリキャリッジ装置 |
JP3868181B2 (ja) * | 2000-03-27 | 2007-01-17 | 松下電器産業株式会社 | 磁気ディスク装置 |
CN1221971C (zh) | 2001-02-13 | 2005-10-05 | 松下电器产业株式会社 | 工作头支撑装置及使用该工作头支撑装置的盘装置 |
SG107115A1 (en) * | 2001-10-02 | 2004-11-29 | Matsushita Electric Ind Co Ltd | Head slider and head supporting device and disk drive |
JP2004030856A (ja) | 2002-06-28 | 2004-01-29 | Tdk Corp | ヘッドアームアセンブリ及び該ヘッドアームアセンブリを備えたディスク装置 |
JP3945761B2 (ja) | 2002-07-25 | 2007-07-18 | Tdk株式会社 | 磁気ヘッド装置、磁気ヘッド支持機構、ならびに磁気記録装置 |
US7068469B2 (en) | 2002-08-07 | 2006-06-27 | Matsushita Electric Industrial Co., Ltd. | Head supporting assembly, head driving assembly, and disk drive apparatus |
US7095593B2 (en) | 2002-09-27 | 2006-08-22 | Matsushita Electric Industrial Co., Ltd. | Apparatus with head and head support device having rotation supporting point |
JP3861791B2 (ja) | 2002-10-11 | 2006-12-20 | ソニー株式会社 | 緩衝材及びこれを用いた情報記憶装置 |
JP2005085441A (ja) * | 2003-09-11 | 2005-03-31 | Hitachi Global Storage Technologies Netherlands Bv | 回転円板形記憶装置及びラッチ方法 |
-
2005
- 2005-12-27 JP JP2006550787A patent/JP4492615B2/ja not_active Expired - Fee Related
- 2005-12-27 CN CN2005800458729A patent/CN101095193B/zh not_active Expired - Fee Related
- 2005-12-27 US US11/794,681 patent/US7804665B2/en not_active Expired - Fee Related
- 2005-12-27 WO PCT/JP2005/023876 patent/WO2006073086A1/ja not_active Application Discontinuation
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP3374846B2 (ja) * | 2001-02-13 | 2003-02-10 | 松下電器産業株式会社 | ヘッド支持装置 |
JP2003069671A (ja) * | 2001-08-29 | 2003-03-07 | Matsushita Electric Ind Co Ltd | 携帯電話機 |
JP2004087101A (ja) * | 2002-08-07 | 2004-03-18 | Matsushita Electric Ind Co Ltd | ヘッド支持装置、ヘッド駆動装置およびディスク装置 |
JP2004071089A (ja) * | 2002-08-08 | 2004-03-04 | Matsushita Electric Ind Co Ltd | ヘッド支持アーム、ヘッド支持装置およびディスク装置 |
JP2004139717A (ja) * | 2002-09-27 | 2004-05-13 | Matsushita Electric Ind Co Ltd | ヘッド支持装置およびこれを用いたディスク装置 |
Also Published As
Publication number | Publication date |
---|---|
US7804665B2 (en) | 2010-09-28 |
CN101095193B (zh) | 2010-11-10 |
US20090207526A1 (en) | 2009-08-20 |
JP4492615B2 (ja) | 2010-06-30 |
JPWO2006073086A1 (ja) | 2008-06-12 |
CN101095193A (zh) | 2007-12-26 |
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