JP2013078249A - Rotary apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rotary apparatus having an airtight structure which prevents air leak and avoids the increase of the manufacturing cost in a structure where a leader line is led out from a through hole of a substrate disposed so as to cover an opening hole of a housing.SOLUTION: A disk driving apparatus has: a hub member; a bearing unit; a driving unit; a base member 12 which forms a sealed space and has an opening 60 allowing a leader line 38a led out from the driving unit to be led out from the sealed space to an exterior space; and a flexible wiring board 62 disposed at a position corresponding to the opening 60 at the outer side of the base member 12. The flexible wiring board 62 has a through hole 68 through which the leader line 38a penetrates from the opening 60, and a hardening resin 64 is applied from the surface side of the base member 12. The flexible wiring board 62 has multiple auxiliary holes 70 disposed so as to annularly enclose the through hole 68 and into which the hardening resin 64 flows.

Description

  The present invention relates to a rotating device, and more particularly to an improvement in an airtight structure of the rotating device.

  In recent years, a technology for improving the recording density of a hard disk drive device (hereinafter simply referred to as a disk drive device), which is one of rotating devices, has rapidly advanced, and the recording capacity has been dramatically increased. As the recording density increases, it is important to take measures against entry of foreign matter into the disk drive device. For example, the distance between the surface of the recording disk housed as a recording medium in the disk drive and the magnetic head is several nanometers. On the other hand, the dust contained in the atmosphere is much larger, and if it enters the disk drive unit, it may cause poor access to the recording disk of the magnetic head or physical damage to the recording disk or magnetic head. May cause Therefore, the housing of the disk drive device needs to have a sealed structure. On the other hand, a motor for driving the recording disk and a magnetic head are housed inside the disk drive. That is, it is necessary to draw out a lead line such as a signal line from the sealed space of the disk drive device in order to input / output a signal to / from the power supply line to the magnetism generating coil of the motor and the magnetic head. That is, it is necessary to form a structure in which the clean air space communicates with the external non-clean air space. In this case, the lead wire is drawn through an opening formed in a part of the housing of the disk drive device. As described above, since the housing needs to have a sealed structure, the opening hole portion needs to have a highly airtight structure so that air leakage does not occur.

  Various structures for ensuring the hermeticity of the housing have been proposed. For example, there is a structure in which a resin sealant is applied to the opening hole portion and sealed (see, for example, Patent Document 1). In the case of the technique described in Patent Document 1, after the lead wire is drawn out from the opening hole of the housing, the outer surface of the housing is routed and soldered to a substrate such as a flexible wiring board fixed to the other part of the outer surface of the housing. Connected. In this case, the opening hole was covered with a resin agent in order to prevent air leak in the opening hole.

JP 2010-218612 A

  The inventors have recognized that it is desirable to immediately connect the lead line drawn from the opening hole to the substrate in consideration of prevention of disconnection of the lead line drawn from the housing. In other words, it is recognized that it is desirable to place the board to be placed on the outer surface of the housing so that the opening hole is covered and to solder the lead wire to the land on the board immediately after inserting the through hole formed in the board. did. However, in this case, even if there are slight irregularities or undulations on the outer surface of the housing on which the substrate is disposed or the surface of the substrate in contact with the outer surface of the housing, a gap is formed there, which may cause air leakage. Therefore, it is necessary to process the surface of the housing and the surface of the substrate in contact with the outer surface of the housing to improve the plane accuracy, or it is necessary to apply a lot of resin agent to cover the entire substrate, resulting in an increase in manufacturing cost. There was a problem of causing.

  The present invention has been made in view of such a situation, and an object of the present invention is to prevent air leakage and reduce the manufacturing cost in a structure in which a leader line is drawn out from a through hole of a substrate disposed so as to cover the opening hole of the housing. It is an object of the present invention to provide a rotating device having an airtight structure that can avoid an increase in the number of times.

  In order to solve the above-described problems, a rotating device according to an aspect of the present invention includes a hub member on which a recording disk is to be placed, a bearing unit that rotatably supports the hub member, and a drive unit that rotationally drives the hub member. A housing having at least a hub member, a bearing unit, and a drive unit to form a sealed space and having an opening hole for drawing out a lead line drawn from the drive unit from the sealed space to the external space; A substrate disposed at a position corresponding to the opening hole, the substrate having a through-hole through which the lead wire led out from the opening hole passes, and a connecting portion for connecting the lead-out wire drawn out from the through-hole, and And a curable resin that is applied to a surface of the substrate that is not in contact with the housing and covers at least the through hole and the surrounding area. The substrate has auxiliary holes penetrating the front and back surfaces of the substrate arranged so as to surround the through hole.

  According to this aspect, the curable resin enters between the substrate and the housing or into the opening hole of the housing from the auxiliary holes that are arranged so as to surround the through hole and penetrate the front and back of the substrate.

  According to the present invention, even if the curable resin is not applied to the entire substrate, the curable resin that has flowed from the auxiliary hole enters between the substrate and the housing or into the opening hole of the housing, and seals the gap that causes air leakage. . As a result, it is possible to provide a rotating device that can prevent air leakage of the housing with a small amount of curable resin.

It is explanatory drawing explaining the internal structure of the disk drive device which is an example of the rotation apparatus of this embodiment. It is sectional drawing explaining the internal structure centering on the bearing unit of the disk drive device of FIG. It is explanatory drawing explaining arrangement | positioning of the through-hole and auxiliary hole of a flexible wiring board applied to the rotary apparatus of this embodiment. It is explanatory drawing explaining the filling state of curable resin at the time of applying the flexible wiring board of this embodiment. It is explanatory drawing explaining the filling state of curable resin at the time of using the flexible wiring board which does not have an auxiliary hole.

  DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, preferred embodiments of the invention will be described 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.

  FIG. 1 is an explanatory diagram illustrating an internal configuration of a disk drive device 10 (hard disk drive device: HDD) that is an example of a rotating device according to the present embodiment. FIG. 1 shows a state in which the cover 11 is removed to expose the internal configuration of the disk drive device 10. By attaching the cover 11 to the base member 12, the inside of the disk drive device 10 is set as a sealed space M. Therefore, in the present embodiment, the housing 13 is configured by the base member 12 and the cover 11.

  On the upper surface of the base member 12, a brushless motor 14, an arm bearing portion 16, a voice coil motor 18, and the like are placed. The brushless motor 14 supports a hub member 26 for mounting the recording disk 20 on a rotating shaft, and rotationally drives the recording disk 20 capable of recording data magnetically, for example. The brushless motor 14 can be a spindle motor, for example. The brushless motor 14 drives the recording disk 20 to rotate. The brushless motor 14 is driven by a three-phase drive current consisting of a U phase, a V phase, and a W phase. The arm bearing portion 16 supports the swing arm 22 so as to be swingable within the movable range AB. The voice coil motor 18 swings the swing arm 22 in accordance with external control data. A magnetic head 24 is attached to the tip of the swing arm 22. When the disk drive device 10 is in the operating state, the magnetic head 24 moves on the surface of the recording disk 20 within a movable range AB through a slight gap as the swing arm 22 swings, and reads / writes data. In FIG. 1, point A corresponds to the position of the outermost recording track of the recording disk 20, and point B corresponds to the position of the innermost recording track of the recording disk 20. The swing arm 22 may move to a retreat position provided beside the recording disk 20 when the disk drive device 10 is in a stopped state.

  In the present embodiment, the recording disk 20, the swing arm 22, the magnetic head 24, the voice coil motor 18, and the like including all structures for reading / writing data may be expressed as the disk drive device 10 (rotary device). Or, it may be expressed as HDD. In addition, only the portion that rotationally drives the recording disk 20 may be expressed as a disk drive device 10 (rotating device).

FIG. 2 is a cross-sectional view illustrating the internal structure centering on the bearing portion of the disk drive device 10 of FIG.
As shown in FIG. 2, the disk drive device 10 of this embodiment includes a radial fluid dynamic pressure bearing including a fixed body portion S, a rotating body portion R, radial dynamic pressure grooves RB <b> 1 and RB <b> 2, and a lubricant 52. Bearing unit 30 including a thrust fluid dynamic pressure bearing portion constituted by a portion and thrust dynamic pressure grooves SB1 and SB2, and the rotating body portion R is rotationally driven with respect to the fixed body portion S via these fluid dynamic pressure bearing portions. And a drive unit 32. FIG. 2 shows, as an example, a structure of a so-called shaft rotation type disk drive device 10 in which a hub member 26 that supports the recording disk 20 and a shaft 34 rotate together. The members constituting the disk drive device 10 may be included in a plurality of groups among the groups functionally divided by the fixed body portion S, the bearing unit 30, the rotating body portion R, and the drive unit 32. For example, the shaft 34 is included in the rotating body portion R and also included in the bearing unit 30.

  The fixed body portion S includes the base member 12, the stator core 36, the coil 38, the sleeve 40, and the counter plate 42. The stator core 36 is fixed to the outer wall surface of the cylindrical portion 12 a formed on the base member 12. The sleeve 40 is a cylindrical part and is formed of a metal material or a resin material having conductivity. The outer peripheral surface of the sleeve 40 forms an outer peripheral surface of a bearing unit 30 described later. The bearing unit 30 is fixed to the bearing hole 12b formed by the inner wall surface of the cylindrical portion 12a of the base member 12 with, for example, an adhesive. A disc-shaped counter plate 42 is fixed to one end of the sleeve 40 and seals the inner side of the base member 12 in which the recording disk 20 and the like are stored. Therefore, the counter plate 42 also contributes to forming a sealed space of the housing 13.

  The base member 12 is formed by, for example, cutting a part after applying an epoxy resin coating on the surface of a base material manufactured by aluminum die casting, pressing an aluminum plate, or after pressing an iron plate. It can be formed by applying nickel plating. The stator core 36 is formed by laminating a plurality of magnetic plate materials such as silicon steel plates and then subjecting the surface to insulation coding by electrodeposition coating, powder coating, or the like. The stator core 36 is a ring-shaped member having a plurality of salient poles (not shown) projecting outward in the radial direction, and a coil 38 is wound around each salient pole. For example, if the disk drive device 10 is three-phase driven, the number of salient poles is nine and nine coils 38 are formed. The winding terminals of the respective phases of the coil 38 are combined into a lead line 38 a and drawn out from an opening hole 60 formed in the bottom surface of the base member 12. For example, in the case of three-phase driving, the start of winding is independent, and the end of winding is in a state where all phases are connected, and a total of four lines are drawn from one opening hole 60. The lead line 38a drawn from the opening hole 60 is drawn to the outer surface side (non-contact side with the base member 12) of the flexible wiring board (FPC) 62 arranged so as to cover the opening hole 60, and is formed on the board. Soldered to the land. As will be described later, a curable resin 64 is applied to the lead line 38a drawn to the outer surface side of the flexible wiring board 62 and its periphery so as to prevent air leakage caused by the opening hole 60 formed in the base member 12. ing.

  The rotating body R includes a hub member 26, a shaft 34, a flange 44, and a magnet 46. The hub member 26 is a substantially cup-shaped member, and has an outer peripheral cylindrical portion 26b concentric with the center hole 26a, and an extended portion 26c extending outward from the lower end of the outer peripheral cylindrical portion 26b. A ring-shaped magnet 46 is fixed to the inner wall surface of the outer extension 26c. The hub member 26 can be formed by cutting a metal such as stainless steel, aluminum, or iron. Note that. The hub member 26 can also be formed by molding or machining a conductive resin. The magnet 46 is formed of, for example, an Nd—Fe—B (neodymium-iron-boron) material, and the surface is subjected to rust prevention treatment by electrodeposition coating, spray coating, or the like. In the present embodiment, the inner peripheral side of the magnet 46 is magnetized, for example, to 12 poles.

  One end of the shaft 34 is fixed to a center hole 26 a formed in the hub member 26, and a disk-like flange 44 is fixed to the other end. The shaft 34 can be formed of a conductive metal such as stainless steel. The flange 44 can be formed of a metal material or a conductive resin material. At one end of the sleeve 40, a flange storage space 40a for storing the flange 44 is formed. Therefore, the sleeve 40 supports the shaft 34 to which the flange 44 is fixed while allowing relative rotation in a space surrounded by the cylindrical inner wall surface 40b and the flange storage space 40a.

  The shaft 34 with the flange 44 of the rotating body portion R is inserted along the cylindrical inner wall surface 40 b of the sleeve 40 of the fixed body portion S. As a result, the rotor part R is a radial fluid dynamic pressure bearing part constituted by radial dynamic pressure grooves RB1 and RB2 and a lubricant 52, and a thrust fluid dynamic pressure bearing constituted by thrust dynamic pressure grooves SB1 and SB2 and a lubricant 52. It is rotatably supported by the fixed body part S via the part. The drive unit 32 includes a stator core 36, a coil 38, and a magnet 46. At this time, the hub member 26 constitutes a magnetic circuit together with the stator core 36 and the magnet 46. Therefore, the rotating body portion R is rotationally driven by sequentially energizing the coils 38 under the control of the drive circuit connected via the flexible wiring board 62.

  Note that the outer peripheral cylindrical portion 26b of the hub member 26 of the present embodiment engages with the center hole of the recording disk 20, and the extended portion 26c positions and supports the recording disk 20. A clamper 48 is placed on the upper surface of the recording disk 20, and the clamper 48 is fixed to the hub member 26 by a screw 50. As a result, the recording disk 20 is integrally fixed to the hub member 26 and can be rotated together with the hub member 26.

Next, the bearing unit 30 will be described.
The bearing unit 30 includes a shaft 34, a flange 44, a sleeve 40, and a counter plate 42. The cylindrical inner wall surface 40b of the sleeve 40 and the outer peripheral surface of the shaft 34 opposed thereto form a radial space portion. Radial dynamic pressure grooves RB1 and RB2 for generating dynamic pressure for supporting in the radial direction are formed on at least one of the cylindrical inner wall surface 40b of the sleeve 40 and the outer peripheral surface of the shaft 34. The radial dynamic pressure groove RB1 is formed on the side closer to the hub member 26, and the radial dynamic pressure groove RB2 is formed on the side farther from the hub member 26 than the radial dynamic pressure groove RB1. The radial dynamic pressure grooves RB1 and RB2 are, for example, herringbone or spiral grooves that are spaced apart in the axial direction of the shaft 34. The formation space of these radial dynamic pressure grooves RB1 and RB2 is filled with a lubricant 52 such as oil. Therefore, a portion with high pressure is generated in the lubricant 52 as the shaft 34 rotates. The shaft 34 is separated from the surrounding wall surface by the pressure, and the shaft 34 is brought into a substantially non-contact rotation state in the radial direction.

  As described above, the flange 44 that rotates integrally with the shaft 34 is fixed to the lower end of the shaft 34. A flange accommodating space 40a for rotatably accommodating the flange 44 is formed at the central portion of the lower surface of the sleeve 40. One end of the flange storage space 40a is sealed by the counter plate 42, so that the flange storage space 40a and the storage space of the shaft 34 following the flange storage space 40a can be maintained.

  A thrust dynamic pressure groove SB1 is formed in at least one of the surfaces of the flange 44 and the sleeve 40 facing in the axial direction, and a thrust dynamic pressure groove SB2 is formed in at least one of the surfaces of the flange 44 and the counter plate 42 facing each other. A thrust fluid dynamic pressure bearing portion is formed in cooperation with the agent 52. The thrust dynamic pressure grooves SB1 and SB2 are formed, for example, in a spiral shape or a herringbone shape, and generate the dynamic pressure of the pump-in. That is, the dynamic pressure of the pump-in is generated by the rotation of the flange 44 on the rotating body R side with respect to the sleeve 40 and the counter plate 42 on the fixed body S side. As a result, the generated dynamic pressure causes the rotating body portion R including the flange 44 to be in a substantially non-contact state with a predetermined gap in the axial direction with respect to the fixed body portion S, so that the rotating body portion R including the hub member 26 The fixed body part B is supported in a non-contact state.

  In the case of this embodiment, the lubricant 52 filled in the gaps in the radial fluid dynamic pressure bearing portion and the thrust fluid dynamic pressure bearing portion is shared with each other. The open end side of the sleeve 40 constitutes a capillary seal portion TS in which a gap between the inner periphery of the sleeve 40 and the outer periphery of the shaft 34 gradually increases outward. The space including the radial dynamic pressure grooves RB1 and RB2 and the thrust dynamic pressure grooves SB1 and SB2 and the middle of the capillary seal portion TS are filled with the lubricant 52. The capillary seal portion TS prevents the lubricant 52 from leaking from the filling position to the outside due to a capillary phenomenon.

FIG. 3 is an enlarged view of a part of the flexible wiring board 62 arranged to cover the opening hole 60 formed in the base member 12 constituting the housing 13, specifically, a part covering the opening hole 60. .
The flexible wiring board 62 is formed with a plurality of lands 66 to which lead wires 38a drawn from the coils 38 are soldered. In the case of FIG. 3, an example is shown in which four U-phase coil lands, W-phase coil lands, V-phase coil lands, and common lands are arranged. In the case of the present embodiment, the lead line drawn from the magnetic head 24 and the voice coil motor 18 is an example drawn from another place. If necessary, a lead wire land drawn from the magnetic head 24 or the voice coil motor 18 may be provided on the flexible wiring board 62 shown in FIG. Each land 66 is connected to a pattern wiring and connected to a drive circuit (not shown). In addition, a through hole 68 through which a lead line 38 a led out from the opening hole 60 of the base member 12 is inserted is formed at a position substantially equidistant from the plurality of lands 66. That is, the flexible wiring board 62 is disposed at a position corresponding to the opening hole 60 on the outer space side of the housing 13. As described above, the flexible wiring board 62 is formed with a through hole 68 through which the lead line 38 a led out from the opening hole 60 passes. A land 66 is formed on the flexible wiring board 62 as a connecting portion for connecting the lead line 38 a drawn from the through hole 68. It is desirable that the size of the through hole 68 is such that the lead line 38a passes through reasonably and is not too large. For example, when the disk drive device 10 is driven in three phases, one bundle of three lead wires 38a at the end of winding for each phase and three independent lead wires 38a at the start of winding for each phase total six. It is necessary to draw out the equivalent amount. Therefore, the diameter when the through hole 68 is a round hole is required to be at least three times the diameter of the lead line 38a. Further, it is desirable that the upper limit of the diameter of the through hole 68 is such that the gap between the through hole 68 and the lead line 38a is not too large. For example, the upper limit is preferably 9 times or less the diameter of the lead line 38a. Specifically, the inventors have confirmed through experiments that the diameter of the through hole 68 is preferably about 1.8 mm when the wire diameter of the lead wire 38a is 0.22 mm, for example.

  The diameter of the opening hole 60 is slightly larger than the diameter of the through hole 68. For example, when the diameter of the through hole 68 is 1.8 mm, the inventors have confirmed through experiments that the diameter of the opening hole 60 is desirably about 2.1 mm. Thus, by making the opening hole 60 slightly larger than the through-hole 68, the opening hole 60 and the lead wire 38a are not in contact with each other, and insulation between the lead wire 38a and the base member 12 can be ensured.

  In addition, the flexible wiring board 62 is formed so that a plurality of auxiliary holes 70 penetrate the front and back of the flexible wiring board 62 so as to surround the through hole 68. The auxiliary hole 70 has a function of allowing the curable resin 64 applied to the flexible wiring board 62 to enter the inner surface side of the flexible wiring board 62, that is, the side in contact with the outer surface of the base member 12. The curable resin 64 that has entered from the auxiliary hole 70 enters the gap formed in the contact surface between the flexible wiring board 62 and the base member 12 or the inside of the opening hole 60 formed in the base member 12, thereby entering the entry portion. Ensuring airtightness when sealing. The diameter of the auxiliary hole 70 is preferably determined by an experiment or the like corresponding to the viscosity of the curable resin 64. However, the diameter of the land of the flexible wiring board of a general disk drive device, the linearity of the lead lines, and the number of the lead lines 70 to be drawn are used. In view of the diameter of the corresponding through hole 68, the inventors have obtained an experimental result that, for example, 0.7 mm to 1.0 mm is preferable.

  The curable resin 64 can be, for example, an ultraviolet curable resin. In this case, the curing operation can be performed immediately after the application of the curable resin 64, so that the dripping of the curable resin 64 and adhesion to other parts and facilities can be easily prevented, and the workability can be improved. The curable resin 64 may be a resin that can guarantee airtightness, and may be a thermosetting resin or an epoxy resin. In the present embodiment, the curable resin 64 is a one-component epoxy resin having ultraviolet curable properties and thermosetting properties. This is also preferable in terms of easy handling and good sealing properties.

  A plurality of, for example, three or more, preferably five or more auxiliary holes 70 are provided so that the curable resin 64 can enter between the flexible wiring board 62 and the base member 12 at least at the entire circumference of the through-hole 68. It is desirable to arrange around the through hole 68. The auxiliary holes 70 are desirably arranged at equal intervals in the circumferential direction so as to surround the through hole 68. By arranging the auxiliary holes 70 at equal intervals, the curable resin 64 entering from the auxiliary holes 70 can also be made to uniformly enter the periphery of the through holes 68, that is, the opening holes 60, thereby improving the reliability with respect to airtightness. Can be improved. As shown in FIG. 3, each auxiliary hole 70 is formed such that the distance from the center of the through hole 68 to the center of the through hole 68 is shorter than the distance from the land 66 that is the connecting portion to the center of the through hole 68. . Each auxiliary hole 70 is formed at a position that avoids the route from the lead line 38 a to the land 66. That is, by arranging the land 66 on the outer peripheral side from the auxiliary hole 70 and preventing the lead line 38a from overlapping the auxiliary hole 70, the lead line 38a prevents the curable resin 64 from entering the auxiliary hole 70. Consideration is not given. The distance to the center of the through hole 68 is a linear length from the edge of the auxiliary hole 70 (or the land 66) to the place closest to the center of the through hole 68. The diameter of the land 66 is preferably about 2 mm, for example, and is arranged at a position as close as possible to the through hole 68 outside the auxiliary hole 70. As described above, when the diameter of the through hole 68 is set to 1.8 mm, the inventors have confirmed through experiments that it is desirable that the distance from the center of the through hole 68 to the center of the land 66 is about 3.5 mm. Yes. Further, the center of each land 66 should be on a line that bisects the angle formed by two lines connecting the centers of two auxiliary holes 70 adjacent to both sides and the center of the through hole 68. Thus, it is possible to effectively realize a structure in which the above-described lead line 38a does not hinder the entry of the curable resin 64 into the auxiliary hole 70.

  In FIG. 4, the flexible wiring board 62 of the present embodiment is arranged at a position corresponding to the opening hole 60 of the base member 12, and a curable resin 64 is applied to the inside of the base member 12, that is, the airtightness inside the housing 13. It is an expanded sectional view explaining the state which has ensured property. As shown in FIG. 4, the flexible wiring board 62 is arranged so that the center of the through hole 68 substantially coincides with the center of the opening hole 60 of the base member 12. By disposing the flexible wiring board 62 in this way, an unnecessarily large load is not applied to the lead line 38a drawn from the opening hole 60, and the lead is led to the through hole 68 and led to the surface side of the flexible wiring board 62. . Further, the area of the through hole 68 is smaller than the area of the opening hole 60 as described above. With this configuration, the lead-out posture of the lead line 38a is limited by the through hole 68 to prevent the lead line 38a from contacting the inner surface of the opening hole 60, and the inner surface of the opening hole 60 and the lead line 38a. A curable resin 64 is poured between and separated. As a result, the lead wire 38a is reliably insulated from the base member 12.

  Further, a resin reservoir 72 along the circumference of the opening hole 60 is formed at the surface side end of the opening hole 60, that is, at the end facing the flexible wiring board 62. The resin reservoir 72 has a function of accommodating at least the curable resin 64 flowing from the auxiliary hole 70. In the case of FIG. 4, the resin pool part 72 has shown the example made into the taper shape which the surface side expanded. In this way, the resin reservoir 72 has a tapered shape, so that the curable resin 64 flowing from the auxiliary hole 70 can easily enter the opening hole 60. In addition, there is an effect that when the curable resin 64 is applied, it flows into the opening hole 60 due to its own weight. In addition, even when the amount of the curable resin 64 flowing through the auxiliary hole 70 is small, an effect of efficiently sealing the periphery of the opening hole 60 can be obtained. For example, when the diameter of the opening hole 60 is 2.1 mm, the inventors have confirmed through experiments that the diameter of the enlarged diameter end of the resin reservoir 72 is desirably about 3.0 mm. In addition, the resin reservoir 72 is not limited as long as the curable resin 64 is accumulated to improve the sealing performance, and may be other than a tapered shape, for example, a step shape. Further, as shown in FIG. 4, each auxiliary hole 70 is arranged as close to the through hole 68 as possible. Desirably, it is arranged at a position corresponding to the outer edge of the resin reservoir 72. For example, a position where a part of the auxiliary hole 70 and a part of the resin reservoir 72 overlap in the axial direction is desirable. More preferably, it is desirable that the edge of the enlarged diameter end of the resin reservoir 72 is located at the center of each auxiliary hole 70. For example, when the diameter of the through hole 68 is 1.8 mm and the diameter of the auxiliary hole 70 is 1.0 mm, the distance from the center of the through hole 68 to the center of the auxiliary hole 70 can be 1.5 mm. In consideration of the strength of the flexible wiring board 62, it is desirable to secure a minimum distance of about 0.1 mm between the auxiliary hole 70 and the through hole 68. Thus, by setting the positional relationship between the auxiliary hole 70 and the resin reservoir 72, the curable resin 64 can be efficiently allowed to flow into the resin reservoir 72, that is, the opening hole 60.

  By the way, the total area obtained by summing the opening areas of the auxiliary holes 70 of the present embodiment is set to be larger than the transverse area below the resin reservoir 72 of the opening hole 60. Thus, by setting the relationship between the total area of the auxiliary holes 70 and the area of the opening holes 60, the opening holes 60 are sufficiently sealed with the curable resin 64 that has flowed from the auxiliary holes 70, and the inside of the base member 12. That is, the inside of the housing 13 can be kept airtight. In addition, when setting the diameter of the through-hole 68 and the auxiliary hole 70 as mentioned above, the inventors experimented that it is desirable that the number of the auxiliary holes 70 be five considering the strength of the flexible wiring board 62. It is confirmed by.

  In the present embodiment, the curable resin 64 is interposed between the flexible wiring board 62 and the base member 12 in a region outside the auxiliary hole 70 in the planar direction of each auxiliary hole 70. By interposing the curable resin 64 in this manner, the curable resin 64 can be sufficiently supplied around the opening hole 60. As a result, the sealing performance between the flexible wiring board 62 and the base member 12 can be improved, and the inside of the base member 12, that is, the inside of the housing 13 can be made airtight. For example, the curable resin 64 can be applied so as to surround a region corresponding to a region where the land 66 is formed in the planar direction between the flexible wiring board 62 and the base member 12. By applying the curable resin 64 in this manner, a region where the curable resin 64 is interposed between the flexible wiring board 62 and the base member 12 is widened, and the sealing performance between them can be further improved.

  In the present embodiment, the curable resin 64 is applied on the surface side of the flexible wiring board 62 so as to cover the lead lines 38a. By applying the curable resin 64 in this way, it is possible to prevent the leader line 38a from contacting the manufacturing equipment or the like and causing damage or disconnection in the manufacturing process. In the present embodiment, the curable resin 64 is applied so as to cover the lands 66 on the surface side of the flexible wiring board 62. By applying the curable resin 64 in this manner, for example, even when a gap is generated between the curable resin 64 and the flexible wiring board 62 at the stepped portion of the land 66, the curable resin 64 causes the lands 66 to pass through. Since it closely adheres to the covered portion, air leakage from the gap can be suppressed. In the present embodiment, as shown in FIG. 4, the curable resin 64 is applied on the surface side of the flexible wiring board 62 so as not to protrude from the outer surface of the base member 12. By applying the curable resin 64 in this manner, it is possible to suppress the curable resin 64 from adhering to the manufacturing equipment or the like in the manufacturing process.

  Further, as shown in FIG. 4, in the present embodiment, the curable resin 64 is applied by being discharged from a needle 65. First, the needle 65 aims at the through hole 68 and discharges the curable resin 64 into the through hole 68. Next, the needle 65 aims at each auxiliary hole 70 and sequentially discharges the curable resin 64 to each auxiliary hole 70. By applying in this way, manufacturing equipment can be reduced in size. Note that the curable resin 64 may be discharged simultaneously using a plurality of needles 65. By applying the curable resin 64 in this way, the working time is shortened. After the curable resin 64 is applied, the curable resin 64 is irradiated with ultraviolet rays so that at least the surface is temporarily cured. As a result, dripping of the curable resin 64 and adhesion to other parts and facilities can be easily prevented. Thereafter, the curable resin 64 is heated and completely cured.

  FIG. 5 is an explanatory diagram for explaining a comparative example when a flexible wiring board having no auxiliary hole 70 is used. The flexible wiring board 100 is only formed with a through hole 102 through which the lead line 38a is inserted. Further, the opening hole 106 of the base member 104 does not have the resin reservoir 72. Therefore, the curable resin 64 applied to the surface side of the flexible wiring board 100 can only enter the opening hole 106 from the through hole 102. In this case, the lead line 38 a inserted through the through-hole 102 serves as an inflow resistance of the curable resin 64, and a sufficient amount of the curable resin 64 may not be able to flow into the opening hole 106. Further, as described above, it is difficult to guarantee the plane accuracy of the flexible wiring board 100 due to its flexibility. On the other hand, in order to increase the planar accuracy of the contact surface of the flexible wiring board 100 in the base member 104, precise processing is required, which causes an increase in processing cost. From such a background, a gap is likely to occur on the contact surface between the base member 104 and the flexible wiring board 100. Further, as described above, in the case of the flexible wiring board 100 that does not have the auxiliary hole 70, it is difficult for the curable resin 64 to sufficiently flow into the opening hole 106. For this reason, the possibility of air leakage increases as shown by the arrows in FIG. As a countermeasure, it is conceivable to apply the curable resin 64 to the entire surface of the flexible wiring board 100. However, even if the curable resin 64 is applied to the entire surface of the flexible wiring board 100, only the surface coating is required to provide complete confidentiality. It is difficult to guarantee sex. Further, applying a large amount of the curable resin 64 causes an increase in manufacturing cost due to an increase in the amount of the curable resin 64 used. Further, when a large amount of the curable resin 64 is applied, the cured state varies and the curing time increases. Moreover, gas generation increases and it is not preferable in terms of quality. Further, the coating height is increased due to the increase in the curable resin 64, and this hinders the thinning of the disk drive device.

  On the other hand, in the case of the flexible wiring board 62 of the present embodiment having the auxiliary holes 70, the curable resin 64 is not obstructed by the lead wires 38 a, between the flexible wiring board 62 and the base member 12, the opening holes 60, and the like. It can flow into the resin reservoir 72. In this way, by allowing the curable resin 64 to flow from the auxiliary hole 70, the airtightness between the flexible wiring board 62 and the base member 12 can be easily ensured by applying the minimum necessary curable resin 64.

  In the case of the flexible wiring board 62 of the present embodiment, a necessary and sufficient amount of curable resin 64 can be caused to flow from the auxiliary hole 70 between the flexible wiring board 62 and the base member 12 and into the opening hole 60. As a result, as shown in FIG. 5, it is not necessary to apply the curable resin 64 so as to cover the entire flexible wiring board 100, and the amount of the curable resin 64 applied can be reduced. For example, the flexible wiring board 62 may be formed with an application region for applying the curable resin 64 between the outer edge of the flexible wiring substrate 62 and the formation region of the auxiliary hole 70. For example, the application area may be marked on the flexible wiring board 62 and the application area may be clearly shown. As shown in FIG. 3, the outer edge of the flexible wiring board 62 or a belt-like protrusion on the inside thereof. 74 may be formed so that the curable resin 64 does not physically protrude. The protrusion 74 may be formed of a copper pattern or the like at the same time as pattern wiring is printed, or may be formed by changing the thickness of the material sheet of the flexible wiring board 62. It should be noted that it is desirable to determine the required minimum amount of the curable resin 64 by conducting an experiment in advance. In this way, by providing a coating region and managing the coating amount of the curable resin 64, the use of the curable resin 64 more than necessary is suppressed, the cost is reduced, the gas generation amount is reduced, and the curing time is shortened. And reduction in coating height are possible.

  As shown in FIG. 2, the opening hole 60 is formed in a recess 76 formed on the surface of the base member 12 on the external space side. The recess 76 has a size that can accommodate the entire flexible wiring board 62. Therefore, the flexible wiring board 62 is accommodated in a position dug down from the other outer surface of the base member 12 and can be arranged so that the opening hole 60 and the through hole 68 coincide. As a result, the flexible wiring board 62 and the curable resin 64 applied thereto can be prevented from protruding from the outer surface of the base member 12, which can contribute to the thinning of the disk drive device 10.

  In the above-described embodiment, the case where the flexible wiring board 62 is applied to the lead line 38a of the coil 38 has been described. However, the same structure may be applied to the signal line and the control line of the magnetic head 24 and the voice coil motor 18. Well, the same effect can be obtained.

  In the above-described example, the shaft rotation type disk drive device 10 has been described. However, the present invention can also be applied to a shaft fixed type disk drive device, and the same effect can be obtained.

  The disk drive device according to the embodiment has been described above. It goes without saying that these embodiments are merely illustrative and merely illustrate the principles and applications of the present invention. It is understood by those skilled in the art that many modifications and arrangements can be made to the embodiments without departing from the spirit of the present invention defined in the claims, and that such modifications are also within the scope of the present invention. Is understood.

  DESCRIPTION OF SYMBOLS 10 Disc drive device, 11 Cover, 12 Base member, 13 Housing, 20 Recording disc, 30 Bearing unit, 32 Drive unit, 38a Leader, 60 Open hole, 62 Flexible wiring board, 64 Curable resin, 68 Through-hole, 70 Auxiliary hole, 72 resin reservoir, 76 recess, 102 through hole, 106 opening hole.

Claims (8)

A hub member on which the recording disk is to be placed; and
A bearing unit that rotatably supports the hub member;
A drive unit for rotationally driving the hub member;
A housing having an opening for accommodating at least the hub member, the bearing unit, and the drive unit to form a sealed space and pulling a lead line led out from the drive unit from the sealed space to the external space;
A substrate disposed at a position corresponding to the opening hole on the outer space side of the housing, having a through hole that penetrates the lead wire drawn out from the opening hole, and drawn from the through hole A substrate having a connecting portion for connecting the leader line;
A curable resin that is applied to a surface of the substrate that is not in contact with the housing and covers at least the through-hole and the surrounding area;
Including
The rotating device according to claim 1, wherein the substrate includes auxiliary holes penetrating front and back of the substrate, the plurality of the substrates being arranged so as to surround the through hole. The opening hole of the housing has at least a resin reservoir for storing the curable resin flowing from the auxiliary hole,
The rotating device according to claim 1, wherein the auxiliary hole is formed at a position corresponding to an outer edge of the resin reservoir portion.   3. The rotating device according to claim 1, wherein the substrate is formed with an application region where the curable resin is applied between an outer edge portion of the substrate and a region where the auxiliary hole is formed. .   4. The rotating device according to claim 1, wherein a total area of the auxiliary holes is larger than an area of the opening holes.   The rotating device according to any one of claims 1 to 4, wherein the auxiliary holes are formed at equal intervals around the through hole.   The rotating device according to any one of claims 1 to 5, wherein the opening hole is formed in a recess formed in a surface of the housing on the outer space side.   The rotary device according to any one of claims 1 to 6, wherein the curable resin is an ultraviolet curable resin.   The auxiliary hole is formed such that a distance to the center of the through hole is shorter than a distance from the connection portion to the center of the through hole, and is formed at a position avoiding the leader line. The rotating device according to any one of claims 1 to 7, wherein

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