JP2011165257A - Disk drive and method for manufacturing disk drive - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a disk drive configured to reduce a probability that particles enter the inside of the disk drive. <P>SOLUTION: The disk drive includes: a hub for supporting a recording disk; a base member 4 which has a bearing hole centering on a rotary shaft of the hub; a bearing unit 12 which supports the hub so as to be freely rotatable with respect to the base member 4 and is at least partly fixed to the bearing hole 4h; and a sealing material 54 interposed between the bearing hole 4h and the bearing unit 12. A plurality of resin reservoirs 200 having fine recesses to store the sealing material 54 are arranged in a circumferential direction of a contact part , on at least one of an inner peripheral surface of the bearing hole 4h and an outer peripheral surface of the bearing unit 12 at the contact part thereof. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a disk drive device and a method for producing the disk drive device, and more particularly to a disk drive device capable of reducing particle intrusion and a method for producing a disk drive device capable of easily confirming that particle intrusion has been reduced.

  A hard disk drive (HDD) is known as a medium used for a storage device such as a computer. In recent years, disk drive devices such as HDDs have drastically improved rotational accuracy by including a fluid dynamic pressure bearing (see, for example, Patent Document 1). Accordingly, disk drives have been required to have higher density and larger capacity.

  Normally, in a disk drive device, a recording disk on which a recording track is formed is rotated at a high speed by a brushless motor. However, a recording / reproducing head is slightly spaced on the surface of the recording disk for recording / reproducing magnetic data on the recording track. Place with.

JP 2007-198555 A

  As one method for increasing the capacity of the disk drive device as described above, it is conceivable to reduce the width of the recording track and bring the recording / reproducing head closer to the surface of the recording disk. However, when the gap between the recording / reproducing head and the surface of the recording disk is narrow, if there is a foreign matter (hereinafter referred to as “particle”) of about 0.1 μm to several μm in the vicinity of the recording disk, the particle is recorded. It may come into contact with the playback head. When particles come into contact with the recording / reproducing head that is tracing the recording track, energy generated by the contact may be superimposed on the signal as noise, which may reduce the accuracy of signal reading and writing.

  Incidentally, the disk drive device is produced by coupling its constituent members to each other. For example, when a bearing unit is fitted and connected to a bearing hole provided in the base member, there may be a slight gap between the bearing hole and the bearing unit. Through this slight gap, air may enter and exit between the outside of the base member and the inside of the recording disk. In this case, there is a possibility that unclean air containing particles may enter the disk drive device. If the usage period of the disk drive device becomes long, the number of invading particles increases in this way, which may cause an increase in the frequency of malfunction during data recording / reproduction. The present invention has been made in view of such a situation, and an object of the present invention is to provide a disk drive device having a structure capable of reducing the probability that particles enter the inside of the disk drive device, and to reduce the intrusion of particles. It is an object of the present invention to provide a method of producing a disk drive device that can easily confirm that the disk drive device is present.

  In order to solve the above-described problems, a disk drive device according to an aspect of the present invention includes a hub on which a recording disk is to be supported, a base member having a bearing hole centering on the rotation shaft of the hub, and the hub as a base member. A bearing unit that is rotatably supported with respect to the bearing hole, and a curable resin that is interposed between the bearing hole and the bearing unit. At least one of the contact portions on the outer peripheral surface of the unit is formed by arranging a plurality of minute concave resin reservoir portions for storing a curable resin in the circumferential direction of the contact portions.

  According to this aspect, when the curable resin is interposed between the inner peripheral surface of the bearing hole formed in the base member and the outer peripheral surface of the bearing unit, a part of the interposed curable resin stays in the resin reservoir. When the resin stays in the resin reservoir portion, the curable resin tends to exist in a slight gap between the contact portion between the inner peripheral surface of the bearing hole and the outer peripheral surface of the bearing unit. That is, it becomes easy to hold | maintain curable resin in a resin reservoir part and its circumference | surroundings because curable resin accumulates in a resin reservoir part. As a result, the continuous existence probability of the curable resin can be improved as compared with the case where the resin reservoir is not formed. Further, since a plurality of resin reservoirs are formed side by side in the circumferential direction of the contact portion, the continuous existence probability of the curable resin in the circumferential direction can be improved. Since the curable resin is continuously present in the circumferential direction, the curable resin can function as a seal member that seals the outer side and the inner side of the base member with the connection portion interposed therebetween. As a result, it is possible to suppress the intrusion of air from the outside of the base member and suppress the intrusion of particles into the disk drive device.

  Another aspect of the present invention is a method for producing a disk drive device. This method includes a hub on which a recording disk is placed, a base member having a bearing hole centered on a rotation shaft of the hub, a hub that rotatably supports the base member, and at least a part of the bearing hole. And a bearing unit to which is fixed, and a curable resin is attached to at least one of a contact portion between the inner peripheral surface of the bearing hole and the outer peripheral surface of the bearing unit that are fixed to each other. And a step of inserting a bearing unit into the bearing hole, a step of curing the curable resin, and a space defined by including a first surface on the side where the hub is provided in the base member. An airtight measurement step of filling the gas and measuring the rate of pressure drop in the space.

  According to this aspect, even when there is an extremely small gap between the bearing hole of the base member and the bearing unit, it can be easily confirmed whether or not the gap is small enough to reduce particle intrusion. That is, the degree of airtightness inside the disk drive device can be easily confirmed.

  Note that any combination of the above-described constituent elements, and those obtained by replacing the constituent elements and expressions of the present invention with each other among methods, apparatuses, systems, etc. are also effective as an aspect of the present invention.

  ADVANTAGE OF THE INVENTION According to this invention, the structure which can reduce the probability that a particle penetrate | invades in the inside of a disk drive device can be provided. Further, it is possible to provide a method for producing a disk drive device that can easily confirm that particle intrusion is reduced.

FIGS. 1A and 1B are a top view and a side view showing a disk drive device according to an embodiment. It is the sectional view on the AA line of FIG. It is explanatory drawing which illustrates typically the outline shape and the example of arrangement | positioning of the resin reservoir part formed in at least one of the internal peripheral surface of the bearing hole of the disk drive device which concerns on embodiment, and the outer peripheral surface of a bearing unit. FIGS. 4A to 4E are enlarged views for explaining a main part for explaining a process of fixing the bearing unit having the first groove to the base member having the second groove. It is an enlarged bottom view which expands and shows the edge part vicinity of a bearing hole among the lower surfaces of the base of FIG. It is explanatory drawing explaining the concept of the measuring instrument used in the confirmation process which confirms whether the disk drive apparatus which concerns on embodiment has an unacceptable clearance gap.

  The present invention will be described below based on preferred embodiments with reference to the drawings. The same or equivalent components and members shown in the drawings are denoted by the same reference numerals, and repeated descriptions are appropriately omitted. In addition, the dimensions of the members in each drawing are appropriately enlarged or reduced for easy understanding. In addition, in the drawings, some of the members that are not important for describing the embodiment are omitted.

  The disk drive device according to the embodiment is used for a hard disk drive on which a recording disk is mounted.

  In the disk drive device according to the embodiment, the bearing unit is inserted and fixed in the bearing hole provided in the base member. At least one of the contact portions of the inner peripheral surface of the bearing hole and the outer peripheral surface of the bearing unit has a micro concave resin reservoir for storing a curable resin interposed between the bearing hole and the bearing unit. A plurality are arranged side by side in the circumferential direction. Thereby, it is suppressed that the curable resin interposed in the slight gap of a contact part is repelled by the wettability of the contact part surface, the part from which curable resin does not exist is reduced, and formation of an air leak path is suppressed.

  1A and 1B are a top view and a side view showing a disk drive device 100 according to an embodiment. FIG. 1A is a top view of the disk drive device 100 according to the embodiment. The disk drive device 100 includes a base member 4, a rotor 6, a recording disk 8, a data read / write unit 10, and a top cover 2. FIG. 1A shows a state in which the top cover 2 is removed in order to show the inner configuration of the disk drive device 100.

  Hereinafter, the side on which the rotor 6 is mounted with respect to the base member 4 (the upper side in FIG. 1A) will be described as the upper side.

  The recording disk 8 is placed on the rotor 6 and rotates as the rotor 6 rotates. The rotor 6 is rotatably attached to the base member 4 via a bearing unit 12 (not shown in FIG. 1A). The base member 4 is formed, for example, by molding an aluminum alloy by die casting. The base member 4 includes a bottom plate portion 4 a that forms the bottom portion of the disk drive device 100, and an outer peripheral wall portion 4 b that is formed along the outer periphery of the bottom plate portion 4 a so as to surround the mounting area of the recording disk 8. Six screw holes 22 are provided in the upper surface 4c of the outer peripheral wall 4b.

  The data read / write unit 10 includes a recording / reproducing head (not shown), a swing arm 14, a voice coil motor 16, and a pivot assembly 18. The recording / reproducing head is attached to the tip of the swing arm 14, records data on the recording disk 8, and reads data from the recording disk 8. The pivot assembly 18 supports the swing arm 14 so as to be swingable around the head rotation axis S with respect to the base member 4. The voice coil motor 16 swings the swing arm 14 around the head rotation axis S, and moves the recording / reproducing head to a desired position slightly above the upper surface of the recording disk 8. The voice coil motor 16 and the pivot assembly 18 are configured using a known technique for controlling the position of the head.

  FIG. 1B is a side view of the disk drive device 100 according to the embodiment. The top cover 2 is fixed to the upper surface 4 c of the outer peripheral wall portion 4 b of the base member 4 using six screws 20. The six screws 20 correspond to the six screw holes 22, respectively. In particular, the top cover 2 and the upper surface 4c of the outer peripheral wall 4b are fixed to each other so that no leakage occurs from the joint portion to the inside of the disk drive device 100. Here, the inside of the disk drive device 100 is specifically a clean space 24 surrounded by the bottom plate portion 4 a of the base member 4, the outer peripheral wall portion 4 b of the base member 4, and the top cover 2. This clean space 24 is designed so as to be sealed, that is, to prevent leak-in from the outside or leak-out to the outside. The clean space 24 is filled with clean air from which particles have been removed. Thereby, adhesion of foreign matters such as particles to the recording disk 8 is suppressed, and the reliability of the operation of the disk drive device 100 is enhanced.

  2 is a cross-sectional view taken along line AA in FIG. The disk drive device 100 further includes a laminated core 40 and a coil 42. The laminated core 40 has an annular portion and nine salient poles extending radially outward therefrom, and is fixed to the upper surface 4 d side of the base member 4. The laminated core 40 is formed, for example, by laminating four thin electromagnetic steel plates and integrating them by caulking. An insulating coating such as electrodeposition coating or powder coating is applied to the surface of the laminated core 40. A coil 42 is wound around each salient pole. When a three-phase substantially sinusoidal drive current flows through the coil 42, a drive magnetic flux is generated along the salient poles. On the upper surface 4 d of the base member 4, an annular annular wall 4 e centering on the rotation axis R of the rotor 6 is provided. The inner peripheral surface 4f of the annular wall portion 4e forms a part of a side surface of a bearing hole 4h described later provided in the base member 4. The laminated core 40 is press-fitted into the outer peripheral surface 4g of the annular wall portion 4e through the center hole 40a of the annular portion, or is bonded and fixed by clearance fitting. As a method of fitting, the laminated core 40 is fixed at a position surrounding a portion of the side surface of the bearing hole 4h that is in contact with the outer peripheral surface 44a of the housing 44, which is the cylindrical surface of the bearing unit 12. Through the process of attaching the laminated core 40 to the base member 4 and then attaching the bearing unit 12 to the base member 4, the annular wall 4 e of the base member 4 is formed into a diameter by the laminated core 40 when the bearing unit 12 is attached. It is fixed in the direction. As a result, the deformation of the annular wall portion 4e due to the insertion of the bearing unit 12 into the bearing hole 4h can be suppressed. Moreover, the squareness of the bearing unit 12 after insertion is improved. In particular, the base member 4 is often formed of relatively soft aluminum as a metal, but the present embodiment can suppress deformation of the annular wall portion 4e even in such a case.

  The base member 4 is provided with a bearing hole 4 h centering on the rotation axis R of the rotor 6. The bearing unit 12 includes a housing 44 and a sleeve 46 and rotatably supports the rotor 6 with respect to the base member 4. The housing 44 is fixed to the bearing hole 4h of the base member 4 by a method which will be described later with reference to FIGS. The housing 44 has a bottomed cup shape in which a cylindrical part and a bottom part are integrally formed, and is fixed to the base member 4 with the bottom part facing down. The sleeve 46 is a cylindrical member fixed to the inner side surface of the housing 44 by adhesion. At the upper end of the sleeve 46, an overhanging portion 46a is formed projecting outward in the radial direction. This overhanging portion 46 a limits the movement of the rotor 6 in the axial direction in cooperation with the flange 30.

  By making the housing 44 into the shape of a cup with a bottom, it is possible to realize higher strength and thinness than when the cylindrical portion and the bottom portion are separately formed and joined. Moreover, the time and effort required for assembly can be reduced.

  The shaft 26 is accommodated in the sleeve 46. Lubricating oil 48 is injected into the space between the shaft 26, the hub 28, the flange 30 and the bearing unit 12.

  On the inner peripheral surface of the sleeve 46, a pair of herringbone-shaped radial dynamic pressure grooves 50 spaced apart in the vertical direction are formed. A herringbone-shaped first thrust dynamic pressure groove (not shown) is formed on the lower surface of the flange 30 facing the upper surface of the housing 44. A herringbone-shaped second thrust dynamic pressure groove (not shown) is formed on the upper surface of the flange 30 facing the lower surface of the overhanging portion 46a. During the rotation of the rotor 6, the dynamic pressure generated by these dynamic pressure grooves in cooperation with the lubricating oil 48 supports the rotor 6 in the radial direction and the thrust direction.

  A pair of herringbone-shaped radial dynamic pressure grooves may be formed in the shaft 26. Further, the first thrust dynamic pressure groove may be formed on the upper surface of the housing 44, and the second thrust dynamic pressure groove may be formed on the lower surface of the overhanging portion 46a.

  The rotor 6 includes a shaft 26, a hub 28, a flange 30, and a cylindrical magnet 32. The recording disk 8 is mounted on the disk mounting surface 28 a of the hub 28. Three disk fixing screw holes 34 are provided around the rotation axis R of the rotor 6 at intervals of 120 degrees on the upper surface 28 b of the hub 28. The clamper 36 is pressed against the upper surface 28b of the hub 28 by three disk fixing screws 38 screwed into the three disk fixing screw holes 34, and presses the recording disk 8 against the disk mounting surface 28a of the hub 28. .

  The hub 28 is made of a steel material such as SUS430F having soft magnetism. The hub 28 is formed by, for example, pressing or cutting a steel plate, and is formed in a substantially cup-shaped predetermined shape. As the steel material of the hub 28, for example, stainless steel of the trade name DHS1 supplied by Daido Steel Co., Ltd. is preferable in that it is easy to process with little outgas. Similarly, stainless steel of the product name DHS2 supplied by the company is more preferable in terms of further excellent corrosion resistance.

  The shaft 26 is fixed to a hole 28c provided in the center of the hub 28 and provided coaxially with the rotation axis R of the rotor 6 in a state where press-fitting and adhesion are used in combination. The flange 30 has an annular shape, and the flange 30 has an inverted L-shaped cross section. The flange 30 is fixed to the inner peripheral surface 28e of the hanging part 28d of the hub 28 by adhesion.

  The cylindrical magnet 32 is bonded and fixed to a cylindrical inner peripheral surface 28 f corresponding to the cylindrical surface inside the substantially cup-shaped hub 28. The cylindrical magnet 32 is made of a rare earth material such as neodymium, iron, or boron, and faces the nine salient poles of the laminated core 40 in the radial direction. The cylindrical magnet 32 is magnetized for driving with 12 poles in the circumferential direction. The surface of the cylindrical magnet 32 is rust-proofed by electrodeposition coating or spray coating.

Next, the structure of the coupling portion between the base member 4 and the bearing unit 12 for reducing the intrusion of particles into the clean space 24 will be described. That is, the airtightness of the contact portion between the base member 4 and the bearing unit 12 can be ensured.
The cylindrical portion of the bearing unit 12 is formed of various materials. For example, when a resin containing conductive fine particles such as carbon fiber is used, a discharge structure that can easily discharge static electricity generated on the recording disk 8 side via the shaft 26 to the base member 4 side can be formed. In this case, it is preferable in that the adverse effect of static electricity on the recording disk 8 and the recording / reproducing head can be reduced and the weight can be reduced as compared with the case where it is formed of a metal material. The portion to be resinized as described above may be the entire cylindrical portion of the bearing unit 12 or only a part, for example, only the outer peripheral surface of the housing 44 constituting the bearing unit 12. By making even a part of the resin, the above-described weight reduction can be achieved, and by leaving the metal part, the rigidity and the shape maintaining performance can be easily guaranteed.

  When the bearing unit 12 configured in this manner is inserted and fixed to the inner peripheral surface 4f of the base member 4, it is prevented that an air leak path is formed in which the inside and outside of the disk drive device 100 communicate with each other at the contact portion. Need to be completely sealed. In this case, a sealing agent composed of a curable resin or the like can be applied to the contact portion. The sealing agent may be used as an adhesive that fixes the base member 4 and the bearing unit 12, or a sealing agent may be applied separately from the adhesive that fixes the base member 4 and the bearing unit 12. May be. In the following description, the sealing agent will be described as an example of a case where an adhesive that fixes the base member 4 and the bearing unit 12 is used as an example, and those having a sealing function and an adhesive function are expressed as “sealing agent” for convenience.

  By the way, if a sealant is applied between the inner peripheral surface 4f of the bearing hole 4h of the base member 4 and the outer peripheral surface of the bearing unit 12, the sealant may not be applied to the entire surface depending on the wettability of the surface of the contact portion. A minute gap may occur partially. The same applies when the outer peripheral surface 44a of the housing 44 of the bearing unit 12 is formed of resin. This gap causes the formation of an air leak path that connects the inside and the outside of the disk drive device, and there is a possibility that the air tightness of the disk drive device cannot be sufficiently ensured. Further, even when the sealant is applied, the first surface (the inner side of the disk drive device) on which the rotor 6 is provided and the first surface on the opposite side of the surface of the base member 4 even if the gap does not form an air leak path. When there is a pressure difference between the second surface (the outside of the disk drive device), a gap generated by the sealing agent being compressed by this pressure difference may be enlarged. As a result, an air leak path may be formed.

  In the present embodiment, as a configuration for reducing the possibility of the occurrence of the gap as described above when a sealing agent is applied, at least the inner peripheral surface 4f of the bearing hole 4h of the base member 4 and the outer peripheral surface of the bearing unit 12 are used. On the other hand, that is, at least one of the contact portions is provided with a plurality of micro-recessed resin reservoirs for storing the sealing agent.

  FIG. 3 is an explanatory diagram schematically illustrating a schematic shape and an arrangement example of a minute concave resin reservoir for storing a sealing agent. FIG. 3 shows a state where the resin reservoir 200 is formed on the outer peripheral surface of the bearing unit 12, that is, the outer peripheral surface 44 a of the housing 44. The shape of the resin reservoir 200 varies depending on the processing method and processing conditions, but it is sufficient that the sealant can be stored. As shown in FIG. 3, the function of suppressing the formation of the air leak path can be realized with any shape. . FIG. 3 shows an example in which various shapes are mixed in order to schematically show the formation of the resin reservoir portion 200. However, the shape is almost constant according to the processing method and processing conditions, or is set to a constant arrangement direction. You can also The resin reservoir 200 is formed so as to be arranged in a plurality in the circumferential direction of the outer peripheral surface 44a that is a contact portion (in the direction of arrow PP in FIG. 3).

  Thus, by forming a plurality of resin reservoirs 200 in the circumferential direction of the contact portion and storing the sealant in the resin reservoir 200, the possibility of the presence of the sealant on the outer peripheral surface 44a is easily achieved. Can be improved. At this time, the distance between the position L where the sealant is surely present and the position M or the position N where the sealant is adjacent to the position L is shorter than when the resin reservoir 200 is not present. That is, it is possible to suppress the possibility that the sealing agent will bounce due to the influence of wettability and the like. By forming the resin reservoir 200 on the entire circumference with respect to the circumferential direction of the outer peripheral surface 44a, it is possible to suppress the sealing agent from being bent all around. That is, the formation of an air leak path can be suppressed. Further, the sealing agent is held inside the recessed resin reservoir portion 200. As a result, the air pressure between the first surface (the inner side of the disk drive device) on which the rotor 6 is provided and the second surface opposite to the first surface (the outer side of the disk drive device) among the surfaces of the base member 4. Even when there is a difference, a resistance against compression of the sealant is generated. That is, it can avoid compressing a sealing agent and can contribute to the substantial maintenance of the airtight state of a contact part (adhesion part). Further, when the sealant enters the resin reservoir 200, the sealant contacts not only the surface of the outer peripheral surface 44a but also the inner side wall of the resin reservoir 200, so that the substantial contact area increases. As a result, airtightness is improved and adhesion performance can be improved. Thus, by forming a plurality of resin reservoirs 200 in the circumferential direction of the contact surface, it is possible to guarantee the reliability of eliminating the air leak path for the entire outer peripheral surface 44 a of the housing 44.

  The resin reservoir 200 can be provided by chemical processing such as etching. It can also be provided by mechanical processing, and various methods can be used. For example, the outer peripheral surface 44 a of the housing 44 may be formed by performing atmospheric pressure plasma treatment. The atmospheric pressure plasma treatment is a treatment for forming a plurality of minute recesses on the surface by spraying high-density plasma on a material to be treated at a high speed in an atmospheric pressure atmosphere in which a gas mainly composed of argon gas is enclosed. Atmospheric pressure plasma treatment is preferable in that it requires less processing time and hardly generates particles during processing.

  When the resin reservoir 200 is formed by atmospheric pressure plasma processing, the resin reservoir 200 can be shaped to expand toward the rotation axis of the housing 44. By forming the resin reservoir portion 200 so as to increase in diameter from the surface toward the back, the contact area can be easily expanded by entering the inside of the resin reservoir portion 200, and the airtightness is improved as described above. Further improvement in adhesion performance can be expected. Further, by forming the resin reservoir portion 200 so as to increase in diameter from the surface toward the back in this way, the sealant that has entered the resin reservoir portion 200 and hardened becomes difficult to escape, and the holding power of the sealant is increased. Can contribute. As a result, it can be expected that the bearing unit 12 and the bearing hole 4h can counteract thermal expansion and shrinkage due to the change of the sealant with time, and can reduce the decrease in airtightness even after the sealant is cured. When the resin reservoir 200 is formed by atmospheric pressure plasma processing or the like as described above, the arrangement thereof is random as shown in FIG. 3, but the formation interval of each resin reservoir 200 suppresses the sealing agent bounce. It is not necessary to strictly control the formation interval as long as possible. In another example, the resin reservoirs 200 may be regularly formed at regular intervals, for example. Also in this case, the distance between the resin reservoirs 200 may be a distance that can prevent the sealant from being bounced. The circumferential arrangement of the resin reservoirs 200 may be one or a plurality of stripes. Further, the formation width in the axial direction can also be appropriately selected. The sealing performance can be improved by forming a plurality of resin reservoirs 200 or increasing the width of the resin reservoir 200 in the axial direction.

  Further, when the resin reservoir 200 is formed by mixing fine particles such as carbon fiber into the resin constituting the outer peripheral surface 44 a of the housing 44, a part of the fine particles is exposed inside the resin reservoir 200. May be. In this case, the exposed fine particles are entangled with the sealing agent and cured. As a result, the fine particles become nails, and the shrinkage due to the change of the sealant with time can be suppressed, so that the decrease in airtightness and the decrease in adhesive force can be suppressed. In the present embodiment, an example in which fine particles are made of carbon fiber is shown in order to also exhibit conductive performance. However, metal powder may be used, and in the case where conductivity is realized by other means, the fine particles may be fine. The particles need not have conductivity, and the same effect can be obtained with glass fiber or resin powder.

  4A to 4E show a process of fixing the housing 44 by forming the resin reservoir 200 on the outer peripheral surface 44a and the base member 4 having the resin reservoir 200 formed on the side surface 4i of the bearing hole 4h. It is a principal part expansion explanatory view to explain. 4A to 4E show an example in which the first groove 4 j is formed in the bearing hole 4 h and the second groove 44 b is formed in the housing 44 in addition to the resin reservoir 200. Yes. In the present embodiment, for convenience, the bearing hole 4h side is defined as the first groove 4j and the housing 44 side is defined as the second groove 44b.

  First, the first groove 4j will be described. As shown in FIG. 4A, the first groove 4j is an annular groove formed on the side surface 4i of the bearing hole 4h of the base member 4 with the rotation axis of the hub 28 as the center. The sealing agent is accumulated in the first groove 4j and the resin reservoir 200. 4A shows an example in which the first groove 4j is formed in the formation region 200A in which the resin reservoir portion 200 is formed. However, the first groove 4j is formed in a region other than the formation region 200A. Also good.

  In this way, by providing the annular first groove 4j so that the sealing agent adheres continuously to the resin reservoir portion 200 and the first groove 4j, the sealing agent becomes the first groove 4j and the resin reservoir portion. It will enter 200 continuously. As a result, the contact area is increased and the airtightness is improved. Further, by sealing the sealing agent in the annular first groove 4j, an annular sealing region can be formed, and the airtight reliability can be improved. In addition, since the volume of the 1st groove | channel 4j is large compared with the volume of each resin reservoir part 200, the part into which the sealing agent penetration is partially insufficient may arise. On the other hand, since the resin reservoir portion 200 is shallower than the first groove 4j, such an insufficient portion is hardly formed, and a uniform sealing function is realized as a whole. Therefore, by adopting the first groove 4j and the resin reservoir 200 at the same time, a more reliable seal structure can be realized.

  As shown in FIG. 4A, the second groove 44b may be formed on a surface different from the surface on which the first groove 4j is formed, that is, on the outer peripheral surface 44a of the housing 44. The second groove 44b is also an annular groove centered on the rotation axis of the hub 28, and is formed at a position spaced apart from the first groove 4j in the axial direction in a state where the base member 4 and the housing 44 are combined. In the case of FIG. 4A, the resin reservoir 200 is also formed on the outer peripheral surface 44 a of the housing 44, and the sealing agent is accumulated in the second groove 44 b and the resin reservoir 200. 4A shows an example in which the second groove 44b is formed in the formation region 200B in which the resin reservoir 200 is formed. However, the second groove 44b is formed in a region other than the formation region 200A. Also good.

  Since the second groove 44b forms an annular seal region similar to the first groove 4j, the same effect as the first groove 4j can be obtained. In addition, since the first groove 4j and the second groove 44b are formed, a double ring type seal structure is formed, and thus a more reliable seal structure can be realized.

  The cross sections of the first groove 4j and the second groove 44b can be semicircular. Further, the cross-sectional shape of the first groove 4j and the cross-sectional shape of the second groove 44b may each be a polygonal shape, a semi-elliptical shape, or a rounded shape. Further, the inner wall surfaces of the first groove 4j and the second groove 44b also expose fine particles in the same manner as the resin reservoir portion 200, thereby suppressing shrinkage due to aging of the sealant, reducing airtightness and adhesive strength. You may make it suppress. Further, in order to store the curable resin on the inner wall surface of the first groove 4j or the second groove 44b, for example, a plurality of resin recesses having a micro concave shape similar to the resin reservoir 200 may be formed side by side in the circumferential direction. In this case, a more reliable seal structure can be realized.

  A process of fixing the bearing unit 12 to the base member 4 will be described with reference to FIGS. In FIG. 4 (a), a sealing agent 54, which is a liquid resin, is continuously applied over the first groove 4j in the side surface 4i of the bearing hole 4h of the base member 4 so as to go around the bearing hole 4h. Then, the bearing unit 12 is inserted from the upper side of the bearing hole 4h. FIG. 4B shows a state in which the sealant 54 is squeezed and moves toward the lower surface 4k side of the base member 4 as the bearing unit 12 is inserted into the bearing hole 4h. However, the sealant 54 does not move further downward beyond the first groove 4j until the first groove 4j is filled.

  FIG. 4C shows a state in which the bearing unit 12 is inserted to an intermediate position. The first groove 4j is filled with a sealant 54. In addition, the sealing agent 54 also oozes out and accumulates in the second groove 44b provided on the outer peripheral surface 44a of the housing 44. FIG. 4D shows a state in which the bearing unit 12 is inserted to a desired position. In this state, the first groove 4j and the second groove 44b do not overlap in the direction (vertical direction) A1 along the rotation axis R of the rotor 6. However, as shown in the transition from FIG. 4C to FIG. 4D, the first groove 4j and the second groove 44b intersect in the insertion process. That is, since there is a period during which the first groove 4j and the second groove 44b are communicated with each other, a sufficient amount of the sealing agent 54 is supplied to the second groove 44b. In this sense, in the present embodiment, it is desirable that the first groove 4j is positioned above (on the recording disk 8 side) the second groove 44b in the vertical direction A1. Note that the positional relationship in the vertical direction A1 between the first groove 4j and the second groove 44b depends on how the bearing unit 12 is inserted into the bearing hole 4h. That is, in another embodiment, when the bearing unit 12 is inserted from below the base member 4, the first groove 4j provided in the base member 4 is provided in order to provide a period in which the first groove 4j and the second groove 44b intersect. The first groove 4j is located below the second groove 44b provided in the housing 44. Moreover, it is preferable to design the volume of the first groove 4j and the volume of the second groove 44b to be slightly smaller than the volume of the sealant 54 applied first in FIG.

  Further, as shown in the present embodiment, in the process in which the sealant 54 is stored in the first groove 4j and the second groove 44b, the sealant 54 is also stored in the resin reservoir 200 formed in the formation regions 200A and 200B. It is. As a result, when the bearing hole 4h and the housing 44 are combined and fixed, the sealing agent 54 interposed in the contact portion can be easily and reliably stored in the resin reservoir 200, the first groove 4j, and the second groove 44b. It becomes possible, and the sealing agent 54 which suppresses formation of an air leak path can be supplied.

  In addition, it can be said that the first groove 4j and the second groove 44b have a function of capturing excess sealing agent 54. As a result, even when the application amount of the sealing agent 54 is large, the surplus is captured by the first groove 4j and the second groove 44b, and the possibility of protruding to the lower surface 4k side of the base member 4 can be reduced.

  When the assembly of the housing 44 (bearing unit 12) to the base member 4 is completed as described above, the liquid state extends from the cutting portion 4m of the base member 4 to the bottom surface 44c of the housing 44 as shown in FIG. The conductive resin 52 is applied and cured, and a series of assembly operations is completed. The conductive resin 52 is applied to the edge portion 4 l of the bearing hole 4 h on the lower surface 4 k of the base member 4. The base member 4 and the housing 44 are electrically connected by the conductive resin 52.

  As shown in FIG. 4E, in the present embodiment, the first groove 4j and the second groove 44b have an interval D1 between the first groove 4j and the second groove 44b in the vertical direction A1. Is formed to be smaller than the width D2 of the first groove 4j. With the structure having such a relationship, the second groove 44b can be more reliably filled with the sealant 54. This is because the larger the gap D1 between the first groove 4j and the second groove 44b, the more sealant 54 remains in the portion between the first groove 4j and the second groove 44b. This is because the amount of the sealing agent 54 filled in is reduced.

  The first groove 4j and the second groove 44b are formed such that the depth D3 of the first groove 4j and the depth D4 of the second groove 44b are both smaller than the width D2 of the first groove 4j in the vertical direction A1. is doing. With the structure having such a relationship, the first groove 4j and the second groove 44b can be more reliably filled with the sealant 54. When the distal end portion of the housing 44 moves through the opening portion of the first groove 4j, an amount corresponding to the amount of movement of the sealing agent 54 is sent in the depth direction of the first groove 4j. And after the front-end | tip part of the housing 44 passes through the opening part of the 1st groove | channel 4j, since the clearance gap between the side surface 4i and the housing 44 does not change a lot, the sending of the sealing agent 54 to the 1st groove | channel 4j is substantially carried out. Stop. Therefore, if the depth D3 of the first groove 4j is larger than the width D2 of the first groove 4j, the opening portion of the first groove 4j is set before the sufficient amount of the sealing agent 54 is filled to fill the first groove 4j. This is because the end of the housing 44 has passed and the feeding of the sealing agent 54 is stopped. Similarly, when the second groove 44b passes through the opening of the first groove 4j, an amount corresponding to the movement amount is sent in the depth direction of the second groove 44b. And after the 2nd groove | channel 44b passes the opening part of the 1st groove | channel 4j, since the clearance gap between the side surface 4i and the housing 44 does not change a lot, feeding of the sealing agent 54 to the 2nd groove | channel 44b is stopped substantially. To do. Therefore, if the depth D4 of the second groove 44b is larger than the width D2 of the first groove 4j, the opening portion of the first groove 4j is set before the sufficient amount of the sealing agent 54 is filled to fill the second groove 44b. This is because the second groove 44b has passed and the feeding of the sealing agent 54 is stopped.

  Further, in the disk drive device 100 according to the embodiment, as described above, the first groove 4j and the second groove 44b have the depth D3 of the first groove 4j and the depth D4 of the second groove 44b both up and down. It is formed to be smaller than the width D2 of the first groove 4j in the direction A1. Therefore, particularly when a liquid resin imparted with anaerobic curability is used as the sealant 54, the sealant 54 is cured well in the first groove 4j and the second groove 44b. According to experiments conducted by the present inventors, the sealant 54 imparted with anaerobic curability is cured well if both the depth D3 of the first groove 4j and the depth D4 of the second groove 44b are 0.07 mm or less. The result is to do.

  FIG. 5 is an enlarged bottom view showing the vicinity of the edge 4 l of the bearing hole 4 h in the lower surface 4 k of the base member 4. The lower surface 4k of the base member 4 is provided with a cutting portion 4m cut along the edge portion 4l of the bearing hole 4h. The radial width D5 of the cutting part 4m is larger than the cutting depth of the cutting part 4m. The conductive resin 52 is applied from the cutting portion 4 m to the bottom surface 44 c of the housing 44. In particular, in the cutting part 4m, the conductive resin 52 is applied such that the height (thickness in the direction along the rotation axis R) is smaller than the cutting depth of the cutting part 4m.

  The conductive resin 52 is applied so as to cover a predetermined length of the edge 4l of the bearing hole 4h, for example, an arcuate portion 4la corresponding to the radius of the cylindrical portion of the housing 44. The conductive resin 52 is applied so as to cover a part of the bottom surface 44 c of the housing 44 exposed from the lower surface 4 k of the base member 4. In this case, conduction between the conductive resin 52 and the housing 44 is enhanced. Further, according to the disk drive device 100 according to the embodiment, the sealant 54 accumulates in the first groove 4j and the second groove 44b in the process of fixing the bearing unit 12 to the base member 4, and therefore the lower surface 4k side of the base member 4 The amount of the sealing agent 54 that oozes out is reduced. As a result, the base member 4 and the housing 44 can be more reliably connected by applying the conductive resin 52 to any portion of the edge 4l of the bearing hole 4h where the sealing agent 54 does not ooze out. Can do. In addition, the thickness of the disk drive device 100 can be reduced to the extent that the sealant 54 does not ooze out.

  Further, even if the conductive resin 52 is applied onto the leached sealing agent 54, the amount of leaching is small, so that the base member 4 and the housing 44 can be more reliably conducted. At the same time, the thickness of the disk drive device 100 can be reduced. In addition, even when a volume of the sealing agent 54 having a volume of the first groove 4j and the second groove 44b is used, the amount of the sealing agent 54 that oozes out to the lower surface 4k side of the base member 4 is small, so a sufficient amount The base member 4 and the bearing unit 12 can be fixed by using the sealant 54. As a result, the airtightness between the base member 4 and the bearing unit 12 is further enhanced.

 Further, in the disk drive device 100 according to the embodiment, the amount of the sealing agent 54 that oozes out toward the lower surface 4k side of the base member 4 is reduced. In particular, the length of the portion of the edge portion 4 l of the bearing hole 4 h where the sealing agent 54 has oozed out is often smaller than the radius of the cylindrical portion of the housing 44. Therefore, by avoiding such a portion and applying the conductive resin 52 so as to cover the arc-shaped portion 4la corresponding to the radius of the cylindrical portion of the housing 44, the conduction between the base member 4 and the housing 44 is more reliably achieved. In addition, the downward protrusion of the conductive resin 52 can be suppressed.

The conductive resin 52 is a conductive resin whose volume resistivity is smaller than 10 ⁻² Ω · cm. Various materials can be adopted as the conductive resin 52. For example, a so-called two-component epoxy conductive resin in which polyoxypropylene diamine is allowed to act as a curing agent on a main agent in which silver powder is mixed with an epoxy resin is easy to apply, tough, flexible, and excellent in impact resistance. Moreover, it is preferable at a point with few volatile components.

  The cylindrical surface of the bearing unit 12 can be formed from various resin materials. For example, an amorphous plastic may be included. Amorphous plastics can be formed with small dimensional accuracy with little shrinkage during molding. As a result, the variation in the gap with the bearing hole 4h is reduced, which is preferable in that the application amount of the sealing agent 54 is not insufficient or excessive.

  Moreover, you may comprise the cylindrical surface of the bearing unit 12 including polyether imide, for example. Since polyetherimide has a linear expansion coefficient close to that of metal, the change in the gap between the bearing unit 12 and the bearing hole 4h can be reduced with respect to the temperature change. As a result, it is preferable in that the decrease in airtightness caused by thermal expansion can be reduced.

  Typical dimensions of the disk drive device 100 according to the present embodiment are as follows.

D1 = 0.1 mm, D2 = 0.3 mm, D3 = D4 = 0.05 mm, width of first groove 4j, second groove 44b = 0.25 mm, D5 = 0.6 mm, cutting depth of cutting part 4m = 0.2 mm. Further, as the sealing agent 54, various liquid resins can be adopted. For example, a liquid resin mainly composed of an acrylate ester is preferable in that it has little shrinkage, and therefore is less likely to cause a gap in the contact portion (bonding portion) and has a high sealing effect for preventing air leakage. Moreover, what provided the anaerobic curability as the sealing agent 54 can be used. This anaerobic curable liquid resin does not cure while being exposed to the air, but when it enters the contact portion between the housing 44 and the base member 4, it reacts rapidly and polymerizes and cures, and an initial strength can be obtained in a short time. Therefore, it is preferable in that the work becomes easy. Furthermore, what provided the ultraviolet curing property to the sealing agent 54 can be hardened in a short time by irradiating the protruding sealing agent 54 with ultraviolet rays. As a result, it is preferable in that it can be handled early after application of the sealant 54.

  The sealing agent 54 and the conductive resin 52 may gradually release volatile components. These volatile components may contaminate the clean space 24 and hinder normal data read / write operations. Therefore, the base member 4 and the bearing unit 12 are fixed using the sealant 54 and the conductive resin 52 is applied to ensure the electrical connection between the base member 4 and the housing 44, and then the recording disk 8 is attached to the rotor 6. The disk drive device 100 being assembled may be left in a high-temperature bath for a long time before is mounted. In this case, the volatile components of the sealing agent 54 and the conductive resin 52 can be removed more quickly. For example, the present inventors have confirmed experimental results that the volatile components of the sealing agent 54 and the conductive resin 52 are substantially removed by keeping the temperature of the high-temperature bath at 65 ° C. or higher and leaving it for 1 hour or longer. In addition, the present inventors confirmed the experimental result that the volatile components of the sealing agent 54 and the conductive resin 52 are almost completely removed by keeping the temperature of the high-temperature bath at 75 ° C. or higher and leaving it for 1 hour or longer. Yes. The present inventors have shown experimental results that, by keeping the temperature of the high-temperature bath at 100 ° C. or lower, it is possible to prevent deterioration in sealing performance and strength due to modification such as shrinkage of the sealing agent 54 and the conductive resin 52 due to high temperature. Has confirmed.

  Next, a process for confirming whether or not a gap is generated in the contact portion (joint portion) between the outer peripheral surface 44a that is the outer cylindrical surface of the bearing unit 12 and the bearing hole 4h will be described. By including this step, the disk drive device 100 in which a gap is generated can be easily identified as a defective product. That is, it is possible to reduce the production of the disk drive device 100 in which a gap that forms an air leak path is generated. In addition, this confirmation process is performed after the hardening process which hardens liquid resin.

  FIG. 6A and FIG. 6B are explanatory diagrams for explaining the concept of the measuring instrument used in this confirmation process. For example, the base member 4 and the bearing unit 12 are assembled, and the inner surface is defined by the space forming member 2 </ b> A corresponding to the top cover 2 on the first surface of the surface of the base member 4 where the rotor 6 is provided and the outer peripheral wall portion 4 b. This is designated as test specimen 4A. The space forming member 2A is made of substantially the same material as the top cover 2 and has a pressure sensor 300 attached to the inner surface thereof. The space forming member 2A is attached so that the internal space of the test body 4A is substantially airtight. When attaching, the internal space of the test body 4A is filled with a predetermined gas having a pressure higher than the atmospheric pressure. In the case of FIG. 6A, the space forming member 2A is provided with the gas injection valve 302, but the method of injecting the gas can be appropriately selected. For example, if the space forming member 2A is attached in the high-pressure layer, a high-pressure gas can be sealed in the test body 4A. In the confirmation step, a change in the atmospheric pressure in the internal space indicated by the pressure sensor 300 is detected, and the decrease rate is compared with a predetermined reference decrease rate in the measuring device 304. This reference reduction speed can be determined in advance by, for example, measuring the same pressure gas in a reference housing having a gap in which air leakage is acceptable, that is, a gap in which particles can be regarded as substantially not entering and exiting. . In this way, by comparing the actual atmospheric pressure lowering rate with the reference lowering rate, it is possible to confirm whether or not there is an allowable gap in the contact portion between the base member 4 and the bearing unit 12 of the disk drive device 100. . Further, even if a predetermined air pressure is applied between the first surface of the base member 4 and the second surface opposite to the first surface, the contact portion between the outer peripheral surface 44a of the housing 44 of the bearing unit 12 and the bearing hole 4h. It can be confirmed whether or not the airtight state can be substantially maintained. This method is advantageous in that particles are less likely to be generated at the time of confirmation. Note that clean air can be used as the predetermined gas.

  By the way, there is a possibility that the gap is enlarged due to the thermal expansion of the bearing unit 12 and the bearing hole 4 h and the change over time of the sealant 54. Therefore, it is desirable that a gap smaller than nitrogen molecules constituting air can be confirmed in the confirmation step. That is, the predetermined gas may include a gas having a molecular weight smaller than that of nitrogen. A gas with a small molecular weight has a small molecule size, so it passes through a very small gap. For example, helium is an inactive monoatomic molecule and has a molecular weight as small as 1/7 of nitrogen. For this reason, a gap smaller than the diameter of the nitrogen molecule can be confirmed by using a gas containing helium as the predetermined gas. Also, 100% helium can be used as the predetermined gas. In this case, if there is a gap, the rate of exiting from the gap increases, so the presence or absence of the gap can be confirmed in a short time. Thus, by improving the detection accuracy of the gap, extraction of the disk drive device 100 in which the gap between the bearing unit 12 and the bearing hole 4h may expand due to thermal expansion or a change with time of the sealant 54 is also possible. It becomes possible.

  The operation of the disk drive device 100 configured as described above will be described. In order to rotate the recording disk 8, a three-phase drive current is supplied to the coil 42. When the drive current flows through the coil 42, a drive magnetic flux is generated along the nine salient poles. Torque is applied to the cylindrical magnet 32 by this driving magnetic flux, and the rotor 6 and the recording disk 8 fitted thereto rotate. At the same time, the voice coil motor 16 swings the swing arm 14, so that the recording / reproducing head moves back and forth on the recording disk 8. The recording / reproducing head converts the magnetic data recorded on the recording disk 8 into an electric signal and transmits it to a control board (not shown), and the data sent from the control board in the form of an electric signal is magnetically recorded on the recording disk 8. Write as data.

By the way, by setting the electric resistance between the base member 4 and the housing 44 to 100Ω or less, it is possible to suppress troubles caused by static electricity during the operation of the disk drive device 100. However, when the base member 4 is formed of aluminum, the base member 4 may be oxidized, and the desired conductivity may not be secured stably even if the surface on which the oxide film is formed is covered with the conductive resin 52. Correspondingly, in the disk drive device 100 according to the present embodiment, the conductive resin 52 having a volume resistivity of 10 ⁻² Ω · cm or less is applied to the cut surface of the cutting portion 4 m. As a result, the electrical resistance between the base member 4 and the housing 44 can be stably reduced to 100Ω or less, and the occurrence of failure due to static electricity can be reduced. Further, since the portion covered with the conductive resin 52 is inhibited from being oxidized, the conductivity can be maintained.

  The configuration, operation, and production method of the disk drive device according to the embodiment have been described above. It is to be understood by those skilled in the art that these embodiments are exemplifications, and that various modifications can be made to combinations of the respective components, and such modifications are within the scope of the present invention.

  In the embodiment, an example has been described in which at least the outer peripheral surface of the housing 44 is formed of resin and the resin reservoir 200 and the second groove 44b are formed therein. However, the outer peripheral surface of the housing 44 may be metal, The resin reservoir 200 and the second groove 44b may be formed, and the same effect can be obtained.

  In the embodiment, the so-called outer rotor type disk drive device 100 in which the cylindrical magnet 32 is located outside the laminated core 40 has been described. However, the present invention is not limited to this. For example, a so-called inner rotor type disk drive device in which a cylindrical magnet is positioned inside a laminated core may be used.

  In the embodiment, the case where the bearing unit 12 is fixed to the base member 4 and the shaft 26 rotates with respect to the bearing unit 12 has been described. For example, the shaft is fixed to the base member, and the bearing unit is attached to the shaft together with the hub. It may be a fixed shaft type that rotates. In this case, the shaft and the base member are formed separately, and the present invention can be applied when the shaft is inserted into a hole provided in the base member and fixed.

  In the embodiment, the case where the bearing unit 12 is directly attached to the base member 4 has been described. However, the present invention is not limited to this. For example, a brushless motor including a rotor, a bearing unit, a laminated core, a coil, and a base member may be separately formed, and the brushless motor may be attached to the chassis.

  Although the case where a laminated core is used has been described in the embodiment, the core may not be a laminated core.

  In the embodiment, the case where the housing 44 and the sleeve 46 are separate has been described. However, the present invention is not limited to this, and the housing and the sleeve may be integrally formed. In this case, the number of parts can be reduced, and the labor of assembly can be reduced.

  In the embodiment, the case where one first groove 4j is provided on the side surface 4i of the bearing hole 4h of the base member 4 and one second groove 44b is provided on the outer peripheral surface 44a of the housing 44 has been described. There is no limit to the number of grooves.

  Although the present invention has been described based on the embodiments, the embodiments merely show the principle and application of the present invention, and the embodiments are defined in the claims. Needless to say, many modifications and arrangements can be made without departing from the spirit of the present invention.

  4 base member, 4f inner peripheral surface, 4g outer peripheral surface, 4h bearing hole, 4j first groove, 8 recording disk, 12 bearing unit, 28 hub, 28c hole, 28e inner peripheral surface, 44a outer peripheral surface, 44b second groove, R rotating shaft, 100 disk drive, 200 resin reservoir.

Claims (10)

A hub on which the recording disk should be supported;
A base member having a bearing hole centered on the rotating shaft of the hub;
A bearing unit that rotatably supports the hub with respect to the base member, and at least a part of which is fixed to the bearing hole;
A curable resin interposed between the bearing hole and the bearing unit;
With
A plurality of minute concave resin reservoirs for storing the curable resin are formed side by side in the circumferential direction of the contact portion at least one of the contact portions between the inner peripheral surface of the bearing hole and the outer peripheral surface of the bearing unit. A disk drive device. At least the surface portion of the bearing unit is formed of resin, and the resin reservoir portion is formed on the surface portion,
2. The disk drive device according to claim 1, wherein the resin forming the surface portion includes microparticles, and a part of the microparticles is exposed inside the resin reservoir portion.   3. The disk drive device according to claim 1, wherein the resin reservoir portion is expanded toward the rotation shaft.   An annular first groove centered on the rotating shaft is provided on any one surface of the contact portion, and the curability is between the bearing hole and the bearing unit including the first groove and the resin reservoir portion. 4. The disk drive device according to claim 1, wherein a resin is interposed.   An annular second groove centering on the rotation shaft is provided at a position different from the surface on which the first groove is formed and spaced apart from the first groove in the axial direction of the rotation shaft, and the second 5. The disk drive device according to claim 4, wherein the curable resin is interposed including a groove.   6. The disk drive device according to claim 1, wherein the curable resin is an acrylic resin having anaerobic and thermosetting properties. 7. A hub on which a recording disk is placed;
A base member having a bearing hole centered on the rotating shaft of the hub;
And a bearing unit that rotatably supports the hub with respect to the base member and at least a part of which is fixed to the bearing hole.
A step of attaching a curable resin to at least one of the contact portions of the inner peripheral surface of the bearing hole and the outer peripheral surface of the bearing unit that are fixed to each other;
Inserting the bearing unit into the bearing hole;
Curing the curable resin;
An airtight measurement step of measuring a rate of decrease in pressure of the space by filling a space defined by including a first surface on the side where the hub is provided in the base member with a gas having a pressure higher than atmospheric pressure;
A method for producing a disk drive device comprising:   8. The method for producing a disk drive device according to claim 7, wherein the gas includes a gas having a molecular weight smaller than that of nitrogen.   A plurality of minute concave resin reservoirs for storing the curable resin are arranged in the circumferential direction of the contact portion on at least one of the contact portions of the inner peripheral surface of the bearing hole and the outer peripheral surface of the bearing unit fixed to each other. 9. The method for producing a disk drive device according to claim 7, wherein the disk drive device is formed.   An annular first groove centered on the rotating shaft is provided on one surface of the contact portion, and the rotating shaft is centered at a position spaced apart from the first groove in the axial direction of the rotating shaft on the other surface. An annular second groove is provided, and the curable resin is interposed between the bearing hole and the bearing unit including the first groove, the second groove, and the resin reservoir. Item 10. A method for producing a disk drive device according to Item 9.

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