WO2004051642A1 - Dispositif a disque et son procede d'assemblage - Google Patents

Dispositif a disque et son procede d'assemblage Download PDF

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Publication number
WO2004051642A1
WO2004051642A1 PCT/JP2003/015301 JP0315301W WO2004051642A1 WO 2004051642 A1 WO2004051642 A1 WO 2004051642A1 JP 0315301 W JP0315301 W JP 0315301W WO 2004051642 A1 WO2004051642 A1 WO 2004051642A1
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WO
WIPO (PCT)
Prior art keywords
disk
spindle hub
cut surface
spacer
disk device
Prior art date
Application number
PCT/JP2003/015301
Other languages
English (en)
Japanese (ja)
Inventor
Yoshimitsu Momoi
Shouji Kumamura
Original Assignee
Matsushita Electric Industrial Co., Ltd.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Matsushita Electric Industrial Co., Ltd. filed Critical Matsushita Electric Industrial Co., Ltd.
Publication of WO2004051642A1 publication Critical patent/WO2004051642A1/fr

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Classifications

    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B17/00—Guiding record carriers not specifically of filamentary or web form, or of supports therefor
    • G11B17/02—Details
    • G11B17/022—Positioning or locking of single discs
    • G11B17/028—Positioning or locking of single discs of discs rotating during transducing operation
    • G11B17/0287—Positioning or locking of single discs of discs rotating during transducing operation by permanent connections, e.g. screws, rivets
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B17/00—Guiding record carriers not specifically of filamentary or web form, or of supports therefor
    • G11B17/02—Details
    • G11B17/038—Centering or locking of a plurality of discs in a single cartridge

Definitions

  • the present invention relates to a disk device, and more particularly, to a disk device capable of realizing high recording density by reducing disk vibration excited by high-speed disk rotation and an assembling method thereof.
  • FIG. 25 shows the configuration of a magnetic disk device that is generally widely used.
  • a plurality of disks 1 for information recording and storage are stacked and fixed on a spindle hub 2 rotated by a spindle motor 5.
  • Data is recorded as magnetic information on concentrically drawn data tracks on the disk 1.
  • a magnetic head 41 for recording and reproducing information is rotatably arranged on the surface of each disk 1.
  • the magnetic head 41 is fixed to the tip of the actuator 45, and a coil 47 for a voice coil motor 46 (hereinafter abbreviated as VCM) is provided at the other end of the actuator 45.
  • VCM voice coil motor
  • the magnetic head 41 is moved by the airflow generated between the surface of the disk 1 and the magnetic head 41. Ascending slightly from disk 1, magnetic head 41 accesses any position of any data track. To read and write data accurately, the magnetic head 41 must accurately follow the data track. The magnetic head 41 follows the data track in a direction to detect the current position from the service information discretely drawn at multiple locations at equal angular intervals on the data track, and to correct the deviation from the data track. This is done by moving the magnetic head 41, ie, the magnetic head 41.
  • the flying height of the magnetic head 41 is on the order of several tens of nanometers, and dust between the magnetic head 41 and the disk 1 may cause damage to the magnetic head 41 and the disk 1.
  • the magnetic disk device is assembled in a clean room, and after assembly, the magnetic disk device is sealed with a cover (not shown) and an airtight member.
  • Information recording devices are required to have various characteristics such as high capacity (high density), high transfer speed, high reliability, low power consumption, low cost, small size, light weight, and portability.
  • Magnetic disk drives have the advantage of satisfying the user's convenience, especially in terms of capacity and transfer speed, and are indispensable for computers and the like. In the future, it is expected that the capacity and the speed will be further increased, that is, the density and the speed will increase. With this, the narrowing of the data track interval and the spindle motor, which are the promising means for realizing each, are considered. High-speed rotation will progress more and more in the future.
  • Typical mechanical factors that hinder high-precision positioning are the natural vibration of the components that make up the actuator 45, the natural vibration of the spindle motor 5 and the disk 1, and the asynchronous vibration of the bearing of the spindle motor 5. There is.
  • the spindle motor 5 and the disk 1 it is conceivable to reduce the excitation force or make the structure hard to vibrate.
  • An example of the excitation force is an air flow due to the rotation of the disk 1, and more specifically, a pressure fluctuation due to a turbulent flow generated by the rotation.
  • the pressure distribution on the surface of the disk 1 differs between one surface and the other surface of the disk 1, and this fluctuates rapidly with time, thereby exciting the natural vibration of the spindle motor 5 and the disk 1.
  • Actuyue 45 intrinsic vibration is excited by turbulence generated by the rotation of the disk 1.
  • the electromagnetic force of the spindle motor 5 or VCM 46 acts as an exciting force, but these are relatively small compared to the air exciting force.
  • FIG. 26 shows a magnetic disk drive of the central blowing type.
  • a plurality of discs 1 are connected to the spindle In the magnetic disk drive in which the disk 1 is mounted on the disk 2 with the clamp disk 3 and the clamp disk 3, flow paths are formed in the clamp disk 3, the spindle hub 2, and the spacer disk 7.
  • Such a center blowing method is an effective method that can easily form a concrete structure for a disk device when the diameter of the disk 1 was 8 inches or 14 inches.
  • the current disk drives have smaller and thinner spindle motors and spaces between disks, that is, spacer disks.
  • only small configurations can be provided for the intake port, flow path, and exhaust port.
  • the flow path resistance increases.
  • the centrifugal force generated by the rotation of the spindle motor also acts on the air near the intake port to move to the outer periphery. It becomes.
  • the conventional center blow-out method cannot secure a flow rate large enough to form a circulating air flow that can suppress turbulence and eddies near the disk rotating at high speed.
  • the central blowout method requires the provision of channels for all clamps, spacer discs, and spindle hubs, and its structure is complicated. In particular, machining the spindle hub is troublesome.
  • Japanese Patent Application Laid-Open No. 11-297073 discloses a spiral-shaped housing in addition to a conventional center blow-out system, in addition to a clamp and a housing facing a disk surface. There has been proposed a method of increasing the flow rate of the circulating air flow by providing a groove.
  • the centrifugal force acting on the air near the intake port with the rotation of the spindle motor hinders the intake of air from the intake port. Since the pressure due to the bombing action is applied, an air flow is generated toward the inner periphery, that is, near the intake port, and the flow rate of the circulating air flow sucked from the intake port can be increased.
  • its structure has become more complicated, and the disadvantage is that it does not meet the market requirements of disk drives, which are price competitive.
  • the present invention is intended to solve such a problem.
  • the disk By suppressing the separation of air to suppress the generation of turbulence and vortices, the disk by reducing the air excitation force, which is a cause of spindle system-specific vibration, is provided.
  • Reduce vibration It is an object of the present invention to provide a disk device capable of realizing a high recording density and a method of assembling the disk device. Disclosure of the invention
  • a first aspect of the disk device of the present invention is a disk device in which a disk is mounted on a spindle hub via a spacer disk, fixed by a clamp disk, and rotationally drives the disk.
  • the inflow port functions as a discharge port for discharging air to suppress separation of air near the inflow port
  • the outflow port functions as a suction port for supplying air.
  • a second aspect of the disk device of the present invention is a disk device that mounts a disk on a spindle hub via a spacer disk, fixes the disk with a clamp disk, and rotationally drives the disk.
  • a rectifying hole through which at least a part of the air flow generated by the rotation of the disk is passed is provided in the clamp disk.
  • the inflow port and the outflow port of the hole are provided on the outer peripheral side surface of the clamp disk.
  • a third aspect of the disk device of the present invention is a disk device for mounting a disk on a spindle hub via a spacer disk, fixing the disk with a clamp disk, and rotating and driving the disk,
  • a rectifying hole for passing at least a part of an air flow generated by the rotation drive of the disk is provided on the spindle hub, and an inlet and an outlet of the rectifying hole are provided on the outer peripheral side surface of the spindle hub. It is characterized by the following.
  • the flow path resistance decreases and the flow rate through the straightening hole increases, so that the turbulent flow generation / development suppressing action and the pressure fluctuation are increased. Therefore, the effect of reducing disk vibration can be increased, and the effect of reducing disk vibration can be enhanced.
  • the flow regulating hole is parallel to the disk surface, the flow path is formed in the same plane as the disk rotation direction, so that the flow rate through the flow regulating hole is increased. The increase increases the turbulence generation / development suppression effect and the effect of reducing pressure fluctuation, and can enhance the effect of reducing disk vibration.
  • the opening area of the inflow port of the flow regulating hole when the opening area of the inflow port of the flow regulating hole is larger than the vertical cross-sectional area of the central portion of the flow regulating hole, the amount of air flowing into the flow regulating hole increases. As a result, generation and development of turbulence can be suppressed, the effect of reducing pressure fluctuation can be increased, and the effect of reducing disk vibration can be enhanced. Further, in the disk device according to the first to third aspects, when the opening area of the outlet of the flow regulating hole is larger than the vertical cross-sectional area of the central portion of the flow regulating hole, the amount of air flowing out to the flow regulating hole increases. In addition, the generation and development of turbulence can be suppressed, the effect of reducing pressure fluctuation can be increased, and the effect of reducing disk vibration can be enhanced.
  • the cross-sectional area of the flow path increases, the flow rate increases, and the generation of turbulence and
  • a fourth aspect of the disk device of the present invention is a disk device for mounting a disk on a spindle hub via a spacer disk, fixing the disk with a clamp disk, and rotating and driving the disk,
  • the disc has a rectifying hole through which at least a part of the air flow generated by the rotational driving of the disc passes, and the inflow port and the outflow port of the rectifying hole are formed on the outer peripheral side surface of the spacer disc.
  • An opening is formed in the inner peripheral side surface of the spacer disk by a portion of a straightening hole, and a disk insertion cylindrical portion of the spindle hub is provided with the spacer disk.
  • a first flow path facing the opening is provided, and the first flow path and the rectifying hole form a flow path for an air flow generated by rotation of the disk. And wherein the door.
  • the cross-sectional area of the flow path increases and the flow rate through the flow straightening hole increases, thereby suppressing the generation and development of turbulence, increasing the effect of reducing pressure fluctuations, and reducing disk vibration.
  • the effect can be enhanced.
  • the first flow path is an annular groove formed over the entire circumference of the disk insertion cylindrical part, the flow path of the spindle hub can be easily formed by lathe processing. The work time and cost can be reduced.
  • the width of the first flow path in the axial direction is smaller than the thickness of the spacer disk in the axial direction, the coaxiality between the spacer disk and the spindle hub can be maintained, and the flow straightening hole is formed in a predetermined shape.
  • the rectification effect can be secured by maintaining the cross-sectional area of-.
  • the first flow path may be formed by a D-cut.
  • the first detecting device detects the formation position of the opening on the inner peripheral side surface of the spacer disk, and detects the position of the D-cut surface of the disk insertion cylindrical portion.
  • a forming position is detected by a second detection device, and based on the detected positional relationship, the opening and the D-cut surface are aligned to connect the opening and the D-cut surface. This can be easily realized by forming one flow path, and assembling the first flow path and the flow regulating hole so as to form a flow path for an air flow generated by rotation of the disk.
  • an optical sensor is used as a second detection device, and the spindle hub and the optical sensor are relatively rotated while the spindle hub is rotated.
  • the position of the concave portion can be detected by irradiating light toward the cylindrical portion of the disc and sensing the intensity of reflected light or transmitted light.
  • the position of the concave portion is detected.
  • the position may be detected.
  • the optical sensor comes into contact with a coaxial imaginary circle having a radius equal to or larger than the distance between the center axis of the spindle hub and the bottom of the concave portion and smaller than the radius R of the disk insertion cylindrical portion.
  • the intensity of the transmitted light may be detected to be the highest, and the position of the concave portion in the plane direction may be detected.
  • the optical sensor When the D-cut surface is a plane formed in the axial direction of the disk insertion cylindrical portion, the optical sensor is used as a second detection device while rotating the optical spindle hub and the optical sensor relatively. Light may be applied to the bottom surface of the plane formed by the D power in an oblique direction, and the position of the plane may be detected when the intensity of the reflected light is highest.
  • the D-cut surface is a flat surface formed in the axial direction of the disk insertion cylindrical portion, and at least one spindle hub at the base end of the D-cut surface has a concave portion for detecting the position of the D-cut surface.
  • a convex portion is provided, and an optical sensor is used as the second detection device, and the spindle hub and the optical sensor are relatively rotated while facing the concave or convex portion for detecting the position of the D-cut surface.
  • the position of the D-cut surface may be detected by irradiating light and sensing the intensity of reflected light or transmitted light.
  • the D-cut surface is a plane formed in the axial direction of the disk insertion cylindrical portion, and a concave portion for detecting the position of the D-cut surface is provided on a top surface of the spindle hub corresponding to at least one of the D-cut surfaces.
  • a convex part is provided, and an optical sensor is used as the second detection device, While rotating the hub and the optical sensor relative to each other, light is emitted toward the concave or convex portion for detecting the position of the D-cut surface, and the intensity of the reflected light or transmitted light is sensed to obtain the D-cut surface. It may be configured to detect the position of.
  • the concave portion or the convex portion is formed so as to be a divisor of the number of the D-cut surfaces in the same horizontal plane.
  • the D-cut surface is a plane formed in the axial direction of the disk insertion cylindrical portion, and a concave portion or a convex portion for detecting the position of the D-cut surface is provided on the top surface of the spindle hub corresponding to at least one of the D-cut surfaces.
  • An optical sensor is used as the second detection device, and light is emitted toward the concave or convex portion for detecting the position of the D-cut surface while rotating the spindle hub and the optical sensor relatively. Then, the position of the D-cut surface is detected by sensing the intensity of the reflected light or the transmitted light, and the spindle hub in which the position of the D-cut surface is detected is connected to a concave or convex portion provided on the top surface. Alternatively, the spindle hub may be moved to a predetermined position by engaging with an external drive device.
  • an optical sensor may be used as the first detecting means, and the outer peripheral surface of the spacer disk may be irradiated with light to detect the inlet and the outlet.
  • FIG. 1 is a perspective view of spacer disk 7 according to Embodiment 1 of the present invention.
  • FIG. 2A is a plan sectional view of the disk device according to the embodiment, and FIG. 2B is a longitudinal sectional view of a main part.
  • FIG. 3 is a disk drive illustrating another configuration according to the embodiment. It is a principal part longitudinal cross-sectional view.
  • FIG. 4 is a cross-sectional plan view of a spacer disk according to Embodiment 2 of the present invention.
  • FIG. 5 is a cross-sectional plan view of a spacer disk according to Embodiment 3 of the present invention.
  • FIG. 6 is a perspective view of a spindle hub according to Embodiment 4 of the present invention.
  • FIG. 7A is a plan sectional view of the disk device according to the embodiment, and FIG. 7B is a longitudinal sectional view of a main part.
  • FIG. 8 is a perspective view of a spindle hub according to Embodiment 5 of the present invention.
  • FIG. 9A is a plan sectional view of the disk device according to the embodiment, and FIG. 9B is a longitudinal sectional view of a main part.
  • FIGS. 10a to 10c are schematic diagrams illustrating a first light irradiation method for detecting the position in the plane of the D power of the spindle hub in the embodiment.
  • FIG. 11 is a graph showing a received light intensity pattern obtained by the first light irradiation method in the same embodiment.
  • FIGS. 12a and 12b are schematic diagrams illustrating a second light irradiation method for detecting the position in the planar direction of the spindle hub D-power in the embodiment.
  • FIG. 13 is a graph showing an intensity pattern of transmitted light obtained by the second light irradiation method in the same embodiment.
  • FIGS. 14a and 14b illustrate a first light irradiation method for detecting the planar position of the rectifying hole of the spacer disk according to the embodiment.
  • FIGS. 15a and 15b are schematic diagrams illustrating a second light irradiation method for detecting the planar position of the rectifying hole of the spacer disk in the embodiment.
  • FIG. 16 is a perspective view of a spindle hub according to Embodiment 6 of the present invention.
  • FIG. 17A is a plan sectional view of the disk device according to the embodiment, and FIG. 17B is a longitudinal sectional view of a main part.
  • FIGS. 18a and 18b are schematic diagrams illustrating a light irradiation method for detecting the position in the plane of the D-cut of the spindle hub in the embodiment.
  • FIG. 19 is a graph showing an intensity pattern of reflected light obtained by the light irradiation method according to the same embodiment.
  • FIG. 20 is a perspective view of a spindle hub according to Embodiment 7 of the present invention.
  • FIGS. 21a to 21c are schematic diagrams for explaining a light irradiation method for detecting the planar position of the D-tool of the spindle hub in the embodiment.
  • FIG. 22 is a graph showing an intensity pattern of reflected light obtained by the light irradiation method according to the same embodiment.
  • FIGS. 23a and 23b are schematic views illustrating a light irradiation method for detecting the position of the concave portion of the spindle hub according to the eighth embodiment of the present invention.
  • FIG. 24 is a perspective view illustrating an external drive device of the spindle hub according to the embodiment.
  • FIG. 25 is a partially cutaway perspective view showing the configuration of a commonly used disk device.
  • FIG. 26 is a vertical cross-sectional view of a disk device having a configuration of a center blowing method.
  • the “flow path” is used to mean a fluid passage formed by a rectifying hole.
  • Embodiment 1 of the present invention show Embodiment 1 of the present invention.
  • the first embodiment is different in the configuration of the flow path of the airflow generated in the disk device.
  • the spacer disk 7 of the disk device is provided with a plurality of rectifying holes 7c, here four rectifying holes 7c arranged at equal angular intervals.
  • the rectifying hole 7c is provided with both an inlet and an outlet on the outer peripheral surface side of the spacer disk 7, and is a linear hole connecting the inlet and the outlet. That is, the rectifying holes 7c are arranged to intersect with the radial direction of the disk 1.
  • the rectifying hole 7c is formed parallel to the bottom surface 7a of the space disk 7 so as to be parallel to the surface of the disk 1 when assembled as a disk device.
  • a flow inlet is provided on the inner peripheral side of the spacer disk 7 and an outlet is provided on the outer peripheral side, so that the inlet and the outlet are connected to each other. They are connected and arranged along the radial direction of the disk 1.
  • FIGS. 2A and 2B A disk device using the space disk 7 according to the present embodiment configured as described above will be described with reference to FIGS. 2A and 2B as an example.
  • the plurality of disks 1 are stacked on the spindle hub 2 via spacer disks 7, and are fixed so as to be integrally rotatable with the spindle motor 5 by clamp disks 3.
  • the spindle motor 5 rotates in the direction of the dashed arrow
  • the air near the spindle motor 5 and the disk 1 also rotates in the same direction.
  • the housing (not shown) near the spindle motor 5 and the disk 1 (not shown) and the resistance of non-rotating air on the outer peripheral side of the disk 1 are present due to the presence of resistance to air flow.
  • the rotation speed is lower than the rotation speed of the spindle motor 5.
  • the disk 1, the spindle hub 2, the spacer disk 7, and the clamp disk 3 are separated from each other by a speed difference between the rotating air flow and the rotating air flow. Turbulence is generated by this separation phenomenon, and the pressure fluctuation on the surface of the disk 1 acts as an exciting force of the natural vibration of the disk 1. Therefore, if the pressure fluctuation is reduced by suppressing the separation phenomenon, the excitation force can be reduced and the vibration amplitude of the disk 1 can be reduced.
  • the air flows through the spacer as indicated by the solid line arrow. It flows in from the inflow port 7d of the rectifying hole 7c provided in the disk 7, and flows out from the outflow port 7e.
  • the inlet 7 d serves as an outlet for discharging air from the outer peripheral portion of the spacer disk 7 and the inner peripheral portion of the disk 1, and the vicinity of the inlet 7 d. Suppress air separation.
  • the outlet 7e serves as a suction port for supplying air from the outer peripheral portion of the spacer disk 7 and the inner peripheral portion of the disk 1, and suppresses the separation of air near the outlet 7e.
  • the suppression of air separation here means not only reducing the occurrence of air separation, but also preventing small separation with small pressure fluctuations to prevent the occurrence of separation with large pressure fluctuations. Includes generating.
  • a part of the airflow from the inlet 7d toward the outlet 7e again passes through another rectifying hole 7c to form a circulating airflow.
  • a circulating air flow is a regular flow, which is different from a turbulent flow which is a random stirring phenomenon, and as a result, the turbulent flow can be suppressed.
  • the pressure fluctuation on the surface of the disk 1 can be reduced, the excitation force is reduced, and the The vibration amplitude can be reduced.
  • a rectifying hole 3c may be provided in the clamp disk 3, and a rectifying hole 2c may be provided in the flange portion 2a of the spindle hub 2, as shown in FIG. .
  • FIG. 3 an example in which the spacer disk 7, the clamp disk 3, and the spindle hub 2 are provided with the rectifying holes 7 c has been described, but the present invention is not limited to this. It is sufficient that at least one of the spacer disk 7, the clamp disk 3, and the spindle hub 2 has a rectifying hole.
  • FIG. 4 shows a second embodiment of the present invention.
  • the shape of the flow regulating holes 7c formed in the spacer disk 7 is different from that of the first embodiment, but the other basic configurations are almost the same.
  • the flow straightening hole 7c can provide a greater effect of suppressing separation and turbulent flow if the flow path is increased to increase the flow rate of air passing through the flow straightening hole 7c. be able to.
  • the strength of the spacer disk 7 becomes weak, and the disk 1 swells due to the clamp disk 3. For this reason, there is a limit in increasing the flow channel due to dimensional restrictions.
  • the opening areas of the inflow port 7d and the outflow port 7e are reduced. It is formed larger than the vertical cross-sectional area near the center.
  • the inlet 7 By making the opening area of d and outlet 7e larger than the vertical cross-sectional area near the center, at the inlet 7d, the air in the forward direction of rotation is guided by the wall of the inlet 7d. More air flows are trying to flow into the channel, increasing the pressure at inlet 7d. This pressure increase allows more airflow to pass through the same flow path cross-sectional area. At the outlet 7e, the air in the flow path is sucked by the relatively low-speed air rearward in the rotation direction, and the pressure is reduced.
  • the opening area of the outlet 7 e is large, the suction force due to this pressure drop increases, and more air flows out of the flow path, and even if the vertical cross-sectional area near the center is the same, More airflow can be passed than in the first embodiment. That is, as the area of the inlet 7 d or the opening area of the outlet 7 e increases, the flow rate passing through the straightening hole 7 c increases, and the vertical cross-sectional area from the inlet 7 d to the outlet 7 e is almost the same. As compared with the rectifying hole 7c formed as described above, the effect of suppressing separation and turbulence is further enhanced.
  • the pressure fluctuation on the surface of the disk 1 is reduced by increasing the action of suppressing the separation and the turbulent flow, and the excitation force is reduced, thereby reducing the vibration amplitude of the disk 1.
  • FIG. 4 illustrates an example in which the opening areas of both the inlet 7d and the outlet 7e are formed to be larger than the vertical cross-sectional area near the center of the rectifying hole 7c, the present invention has been described.
  • the configuration is not limited to this, and one of the inlet 7 d and the outlet 7 e may be configured to be larger.
  • the present invention is not limited to this.
  • the openings may have different shapes.
  • the configuration in the above-described embodiment is not limited to the rectifying holes 7 c formed in the space disc 7, the rectifying holes 3 c of the clamp disc 3, and the rectifying holes 3 a of the spindle hub 2. Applicable to hole 2c.
  • FIG. 5 shows a third embodiment of the present invention.
  • the shape of the flow regulating hole 7c is different, but the other basic configuration is the same as in each of the above embodiments.
  • a larger separation and turbulence suppression effect can be obtained by increasing the flow rate of the air passing through the rectifying holes 7c. To do so, it is necessary to increase the flow path or reduce the flow path resistance. If the flow path is enlarged, the strength of the spacer disk 7 becomes weak, and the disk 1 swells. In other words, there is a limit to increasing the flow path due to dimensional restrictions.
  • the rectifying hole 7c is formed to have a concave bent shape on the outer peripheral side.
  • the flow path is shorter than the flow straightening holes of the above embodiments, and the flow path can be enlarged while the strength of the spacer disk 7 is the same.
  • the flow path resistance can be reduced at the same time.
  • an axis connecting the center of the inlet 7f and the center of the bent portion, and a center connecting the center of the outlet 7g and the center of the bent portion are connected.
  • the angle between the shaft and the outer circumference is greater than 0 ° and smaller than 180 °.
  • the left side of the center line is a straight straightening hole 7c in the first embodiment for reference, that is, an axis connecting the center of the inlet and the center of the bent portion, and the center of the outlet and the center of the bent portion.
  • the case where the angle on the outer peripheral side formed by the axis connecting the center of the bent portion and the axis is 180 ° is shown.
  • the flow rate passing through the flow straightening hole 7c increases, and separation and turbulent flow are prevented.
  • the suppression action can be further enhanced.
  • This embodiment is different from the above embodiments in that a flow path through which air flows is constituted by a flow straightening hole formed in the spacer disk 7 and a first flow path formed in the spindle hub 2. Is different.
  • the disc insertion cylindrical portion 2b of the spindle hub 2 is provided with a plurality of annular grooves 2d as a first flow path.
  • the spacer disk 7 is provided with a rectifying hole 7c having an inlet 7d and an outlet 7e formed on the outer peripheral side surface.
  • An opening 7b is formed in the inner peripheral side surface by a part of c passing through the inner peripheral side of the spacer disk 7.
  • the annular groove 2 d of the spindle hub 2 is formed in the same axial position as the opening 7 b of the spacer disk 7, that is, the annular groove 2 d and the opening 7 b face each other. ing. Then, when the disk 1 is mounted on the spindle hub 2 via the spacer disk 7, as shown in FIG. 7b, the annular groove 2d and the rectifying hole 7c are connected by the opening 7d. An integrated flow path is configured.
  • the flow path can be enlarged, and peeling and The effect of suppressing turbulent flow can be enhanced. Further, since the degree of freedom of the position of the rectifying holes provided in the spacer disk 7 can be increased, the design for enlarging the flow path while maintaining the strength of the spacer disk 7 can be easily performed.
  • the first flow path may be a concave portion corresponding to the opening 7d as well as the annular groove.
  • the first flow path is an annular groove because it can be easily formed by lathe processing, thereby shortening the working time and cost.
  • the axial width of the groove or the concave portion forming the first flow path is preferably smaller than the axial thickness of the spacer disk 7.
  • the spindle device 2 having a recess corresponding to the opening 7 d is used as the first flow path.
  • the method of assembling is described.
  • the configuration of the members other than the spindle hub 2 is substantially the same as that of the fourth embodiment.
  • FIG. 8 a plurality of radially concave recesses 2 e are formed in the disk insertion cylindrical portion 2 b of the spindle hub 2 as a first flow path. Have been.
  • the recess 2e is formed by a D-cut.
  • FIGS. 9 a and 9 b show an integrated flow path in which the spindle hub 2 configured as described above is used to connect the recess 2 e and the rectifying hole 7 c at the opening 7 d of the laser disc 7. Is a disk device. With such a configuration, the air flow path can be enlarged as in the fourth embodiment.
  • An optical sensor is used to detect the formation position of the opening on the inner peripheral side surface of the spacer disk 7 and the D-cut of the disk insertion cylindrical portion 2b, here the formation position of the concave portion 2e.
  • FIGS. 10 a to 10 c show a first light irradiation method for detecting the recess 2 e of the spindle hub 2.
  • Light is emitted in a horizontal direction from the optical sensor 10 toward the disk insertion cylindrical portion 2 b of the spindle hub 2.
  • the incident light 11 from the optical sensor 10 is reflected by the disc insertion cylindrical portion 2b, and the reflected light 12 is received by the optical sensor 10.
  • the light reflection state is different between the place where the recess 2e is formed and the place where the recess 2e is not formed.
  • Fig. 10a shows the case where the incident light 11 is reflected by the disc insertion cylindrical portion 2b. Since the light is diffused by the curved surface, the reflected light 12 received by the optical sensor 10 is the incident light 1 1 Weaker than the strength of
  • Fig. 10b shows the case where the incident light 11 is reflected without being vertically applied to the recess 2e of the spindle hub 2, and the reflected light 1 2 is not received by the optical sensor 10.
  • the intensity of 2 is ideally zero.
  • Figure 10c shows that the incident light 11 is perpendicular to the recess 2e of the spindle hub 2. This is the case where the light is irradiated and reflected. Since the reflected light 12 is almost entirely received by the optical sensor 10, the intensity of the reflected light 12 is ideally the same as that of the incident light 11.
  • FIG. 11 is a received light intensity pattern showing a change in the intensity of the reflected light 12 with the rotation of the spindle hub 2 in FIGS. 10a to 10c described above.
  • the horizontal axis is the rotation angle of the spindle hub 2
  • the vertical axis is the received light intensity.
  • the state when the intensity of the reflected light 12 becomes highest is shown in FIG. 10C.
  • the plane position of the concave portion 2e is detected, and the spindle hub 2 can be stopped at a predetermined position.
  • the use of the optical sensor 10 makes it possible to easily detect the planar position of the recess of the spindle hub.
  • FIGS. 12 a and 12 b show a second light irradiation method for detecting the recess 2 e of the spindle hub 2.
  • the incident light 11 is emitted in the horizontal direction from the light projecting portion 10a of the optical sensor 10 to the light receiving portion 10b.
  • the incident light 11 is emitted at a predetermined distance from the center of the spindle hub 2.
  • the predetermined distance is set to be equal to or longer than the distance L between the spindle hub 2 and the concave portion 2e and equal to or smaller than the radius R of the disk insertion cylindrical portion.
  • FIGS. 12a and 12b show the reflection state at the spindle hub 2 changes between the two states shown in FIGS. 12a and 12b.
  • Fig. 12a shows the case where the incident light 11 is reflected by the disk insertion cylindrical part 2b, and the reflected light 12 changes its traveling direction and does not reach the light receiving part 10b, so the received light intensity is ideal. It is zero in nature.
  • Fig. 12b shows the case where the plane of the concave portion 2e and the incident light 11 are horizontal, and the light reaches the light receiving portion 10b, so the light receiving intensity is lower than that in Fig. 12a. Become stronger.
  • FIG. 13 is a received light intensity pattern showing an intensity change of the passing light 13 with the rotation of the spindle hub 2 in FIGS. 12a and 12b described above.
  • the horizontal axis represents the rotation angle of the spindle hub 2 and the vertical axis represents the intensity of the received light 13. '
  • the plane position of the concave portion 2e can be detected, and the spindle hub 2 can be stopped at a predetermined position.
  • the D-cut 2e position of the spindle hub 2 can be easily detected by the first and second light irradiation methods.
  • the drive of the spindle hub may be stopped by self-drive by the spindle motor 5 or external drive by an external force.
  • 14A and 14B show a first light irradiation method for detecting the position of the opening 7c of the spacer disk 7 in the plane direction.
  • Fig. 14a shows the incident light 11 reflected by the rectifying hole 7c of the spacer disk 7, and the reflected light 12 reflected by the rectifying hole 7c is unlikely to reach the light receiving portion 10b. Therefore, the received light intensity is weakened.
  • the incident light 11 is reflected in a place where there is no rectifying hole 7c.
  • almost all of the reflected light 12 on the outer peripheral side surface of the spacer disk 7 reaches the light receiving portion 10b, so that the light receiving intensity becomes relatively strong.
  • FIGS. 15 a and 15 b show a second light irradiation method for detecting the rectifying hole 7 c of the spacer disk 7.
  • the incident light 11 is reflected on the outer peripheral side surface of the spacer disk 7, and since the reflected light 12 does not reach the light receiving portion 10b, the light receiving intensity is ideally zero. It is.
  • the incident light 11 passes through the rectifying hole 7c and almost reaches the light receiving section 10b, so that the light receiving intensity is high.
  • the planar position of the recess 2 e of the spindle hub 2 and the opening 7 b of the spacer disk 7 can be easily detected, and the spindle hub 2 and the spacer disk 7 can be easily detected. Can be aligned. As a result, it is possible to easily, automatically, and quickly and accurately assemble a disk device in which the recess 2 e and the opening 2 b are integrally connected to form the rectifying hole 7 c. .
  • FIG. 16 to FIG. 19 show a sixth embodiment of the present invention.
  • the sixth embodiment is different from the fifth embodiment in that the shape of the disk insertion cylindrical portion 2b of the spindle hub 2 is special, but the other configurations are the same.
  • a D-cut surface 2 d covering almost the entire height of the disk insertion cylindrical portion 2 b due to the D-cut is provided in the disk insertion cylindrical portion 2 b of the spindle hub 2 as a first flow path. Is formed.
  • Figures 17a and 17b use the spindle hub 2 configured as described above, and rectify the D-cut surface 2d at the opening 7d of the spacer disk 7.
  • This is a disk device in which the holes 7c are connected to form an integrated flow path. With such a configuration, the air flow path can be enlarged as in the fourth and fifth embodiments.
  • An optical sensor is used to detect the formation position of the opening on the inner peripheral side surface of the spacer disk 7 and the D-cut of the disk insertion cylindrical portion 2b, here, the formation position of the D-cut surface 2e.
  • the incident light 11 is emitted from the light emitting section 10a of the optical sensor 10 to the base end side of the D-cut 2e surface of the spindle hub 2. I do.
  • the incident light 11 is reflected by the spindle hub 2, and the reflected light 12 is received by the light receiving portion 10 b of the optical sensor 10.
  • the light reflection state is different between the place where the D-cut surface 2e is present and the place where it is not.
  • Fig. 18a shows the case where the incident light 11 is reflected by the top surface 2g of the disc insertion cylindrical portion 2b, and most of the reflected light 12 is not received by the light receiving portion 10b.
  • the reflected light 12 received by the light source is weaker than the intensity of the incident light 11.
  • Fig. 18b shows the case where the incident light 11 is reflected by the bottom surface 2f of the D-cut 2e of the spindle hub 2, and the reflected light 12 is almost completely removed from the optical sensor 1.
  • the intensity of the reflected light 12 is relatively strong, and is ideally the same as the incident light 11.
  • FIG. 19 is a received light intensity pattern showing a change in the intensity of the reflected light 12 with the rotation of the spindle hub 2 shown in FIGS. 18a and 18b.
  • the horizontal axis is the rotation angle of the spindle hub 2
  • the vertical axis is the received light intensity.
  • the time when the intensity of the reflected light 12 becomes highest is shown in Fig. 10c.
  • the plane position of the D-cut surface 2e is detected, and the D-cut surface 2e of the spindle hub 2 is determined. Can be stopped at the position.
  • the optical sensor 10 By using the optical sensor 10 in this manner, the position in the plane of the D-cut surface of the spindle hub can be easily detected.
  • FIG. 20 to FIG. 22 show a seventh embodiment of the present invention.
  • the seventh embodiment differs from the sixth embodiment in that a mark for position detection is provided at the bottom of the D-cut surface in order to detect the formation position of the D-cut surface on the spindle hub.
  • a concave portion 2 h is formed at the base end of the D-cut surface 2 e as a mark for position detection. Have been.
  • Fig. 21a shows the case where the incident light 11 is reflected by the top surface 2g of the spindle hub 2, and most of the reflected light 12 is received by the light receiving unit 10b. Ideally the same as 11 intensity.
  • FIG. 21 b shows a case where the incident light 11 is reflected at the base end of the D-cut surface 2 e of the spindle hub 2, and the reflected light 12 is almost completely reflected by the optical sensor 10.
  • the received light is ideally the same in intensity as the intensity of the incident light 11.
  • FIG. 21 c shows the case where the incident light 11 is reflected by the concave portion 2 h of the spindle hub 2, and the reflected light 12 is diffused and is not received by the optical sensor 10, so that the received light intensity is close to zero.
  • FIG. 22 is a received light intensity pattern showing a change in the intensity of the reflected light 12 with the rotation of the spindle hub 2 shown in FIGS. 21 a to 21.
  • the horizontal axis is the rotation angle of the spindle hub 2
  • the vertical axis is the received light intensity.
  • the D-cut surface can be detected more easily than in the sixth embodiment.
  • the concave portion 2h has been described as an example of the mark for position detection.
  • the present invention is not limited to this, and may be a convex portion. It is not limited.
  • a mark for position detection is provided on the top surface of the spindle hub 5 at the bottom of the D-cut surface. Different from 6.
  • the top surface corresponds to the formation position of the D-cut surface 2e.
  • Two recesses 2 j are formed in 2 g at equal angular intervals.
  • the concave portion 2j is a non-through hole having a bottom.
  • Fig. 23a shows the case where the incident light 11 is reflected by the top surface 2g of the spindle hub 2, and most of the reflected light 12 is received by the light receiving unit 10b. Ideally the same as 11 intensity.
  • FIG. 23B shows a case where the incident light 11 is reflected by the bottom surface of the concave portion 2j. Since the reflected light 12 is not received by the optical sensor 10, the light receiving intensity is ideally zero.
  • the state of FIG. 23B is when the intensity of the reflected light 12 becomes the weakest, so that the plane position of the concave portion 2 j can be detected. .
  • the positional relationship between the concave portion 2j and the D-cut surface 2e is determined in advance, the position of the D-cut surface 2e can be detected and stopped at a predetermined position.
  • the D-cut surface can be detected more easily than in the sixth embodiment.
  • the number of the non-through holes 2 j provided in the top surface 2 g of the spindle hub 2 is four, but the present invention is not limited to this. There may be two places at equal angular intervals.
  • the concave portion 2 j is described as an example of the mark for position detection.
  • the present invention is not limited to this, and may be a convex portion. It is not limited.
  • the spindle hub 2 in which is detected can move the D-cut surface 2 e to a predetermined position by being driven externally.
  • FIG. 24 shows the driving means for moving the spindle hub. Insert the external drive pin 8 into the recess 2 j to drive the spindle hub 2. Since the planar positional relationship between the concave portion 2j and the D-cut surface 2e is determined, the D-cut surface 2e can be moved to a predetermined position and stopped.
  • the light receiving intensity of the reflected light and the passing light was output as a continuous analog value from the optical sensor and the maximum value was monitored.
  • the present invention is not limited to this. Digital output of / off may be performed.
  • the present invention is not limited to this, and it is sufficient that at least one rectifying hole is provided.
  • the spindle hap 2 and the spacer disk 7 are rotated to detect the intensity of the reflected light 12 or the transmitted light 13, but the present invention is not limited to this. Instead, the sides of the spindle hub 2 and the spacer disk 7 are fixed, and the light emitting intensity is measured by rotating the light emitting portion 10a of the optical sensor 10 and the light receiving portion 10b. good.

Landscapes

  • Holding Or Fastening Of Disk On Rotational Shaft (AREA)

Abstract

L'invention concerne un dispositif à disque apte à réaliser une forte densification d'enregistrement par la suppression de l'apparition d'un écoulement turbulent et de remous. A cet effet, on élimine la séparation d'air afin de réduire la vibration du disque causée par la réduction de la force de sortie de l'air provoquant la vibration naturelle d'un système d'axe. L'invention concerne également le procédé d'assemblage dudit dispositif à disque. Dans ce dernier, le disque (1) est placé sur un moyeu d'axe (2) au moyen d'un espaceur (7) et est fixé par une bride (3), le disque (1) est entraîné par rotation. Les orifices de redressement sont pratiqués dans au moins l'espaceur (7), la bride (3) et le moyeu d'axe (2). Les orifices d'entrée et les orifices de sortie des orifices de redressement sont pratiqués dans la face latérale du pourtour externe de l'élément dans lequel les orifices de redressement sont formés.
PCT/JP2003/015301 2002-12-05 2003-11-28 Dispositif a disque et son procede d'assemblage WO2004051642A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2002354065A JP2004185759A (ja) 2002-12-05 2002-12-05 ディスク装置およびその組み立て方法
JP2002-354065 2002-12-05

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WO2004051642A1 true WO2004051642A1 (fr) 2004-06-17

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7212377B1 (en) * 2004-03-31 2007-05-01 Western Digital Technologies, Inc. Disk drive having apertures near the ID of a disk stack for allowing airflow to pass through the apertures to reduce disk flutter
US7224551B1 (en) * 2004-05-15 2007-05-29 Western Digital Technologies, Inc. Disk drive having apertures aligned near the inner diameter of a disk stack for allowing airflow to pass through the apertures to reduce disk flutter

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01276479A (ja) * 1988-04-18 1989-11-07 Magnetic Peripherals Inc マルチディスク式の磁気ディスクパックに於るスペーサーリング

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01276479A (ja) * 1988-04-18 1989-11-07 Magnetic Peripherals Inc マルチディスク式の磁気ディスクパックに於るスペーサーリング

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7212377B1 (en) * 2004-03-31 2007-05-01 Western Digital Technologies, Inc. Disk drive having apertures near the ID of a disk stack for allowing airflow to pass through the apertures to reduce disk flutter
US7224551B1 (en) * 2004-05-15 2007-05-29 Western Digital Technologies, Inc. Disk drive having apertures aligned near the inner diameter of a disk stack for allowing airflow to pass through the apertures to reduce disk flutter

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