JP2015223066A - Rotary apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve production efficiency of a rotary apparatus.SOLUTION: The rotary apparatus comprises: a hub on which a recording disc should be placed; a base 5 that supports rotatably the hub through a bearing; a core that is fixed to the base 5 and has a circular part and a plurality of salient poles extending in a radial direction from the circular part; a coil formed by being wound around the plurality of salient poles; and an FPC 84 including driving wiring 92a-92d. In the base 5 is formed a wire hole 5i that communicates an upper surface opposing to the coil in a shaft direction with a lower surface 5h at the opposite side of the upper surface. On the lower surface 5h is provided a bottom recessed part 5m including regions that surround a rotating shaft R of the hub and oppose across the rotating shaft R to each other. The FPC 84 includes a circular arc part 84a to be stored in the bottom recessed part 5m. Drawn wires 86a-86d of the coil are drawn to the lower surface 5h side through the wire hole 5i, and connected to the driving wiring 92a-92d at connection lands 88a-88d formed in a circumferential direction separately from the wire hole 5i.

Description

  The present invention relates to a rotating device that rotates a recording disk.

  An example of the rotating device is a disk drive device such as a hard disk drive. Disk drive devices are becoming smaller, thinner, and lighter, and are mounted on various electronic devices. In particular, it is increasingly installed in electronic devices such as notebook computers and recording devices. Conventionally, for example, a disk drive device described in Patent Document 1 has been proposed.

JP 2012-172781 A

  In the disk drive device described in Patent Document 1, a wire at the end of winding of one end of a coil is drawn out to the lower surface side of the base and soldered to a flexible printed circuit board attached to the lower surface of the base. Usually, a flexible printed circuit board is accommodated in the recessed part formed in the lower surface of the base so that it may not protrude below the lower surface of a base. For this reason, depending on the position to be soldered, the peripheral wall of the recess hinders the soldering operation. This is disadvantageous in terms of production efficiency.

  Such a problem can occur not only in the disk drive device but also in other types of rotating equipment.

  This invention is made | formed in view of such a condition, and exists in provision of the rotary apparatus which can improve production efficiency.

  In order to solve the above-described problems, a rotating device according to an aspect of the present invention includes a hub on which a recording disk is to be placed, a base that rotatably supports the hub via a bearing, an annular ring that is fixed to the base, and A stator core having a portion and a plurality of salient poles extending in the radial direction therefrom, a coil formed by being wound around the plurality of salient poles, and a wiring board including a drive wiring. The base is formed with a wire hole that communicates the first surface facing the coil in the axial direction and the second surface opposite to the first surface. An encircling concave portion having a substantially arc-shaped arc region including a region that surrounds and opposes the rotation axis of the hub is provided, and the wiring board includes a substantially arc-shaped arc section accommodated in the arc region. The lead wire of the coil is drawn to the second surface side through the wire hole, and is connected to the drive wiring by a connection land provided in the arc section so as to be spaced apart from the wire hole in the circumferential direction.

  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.

  According to the present invention, the production efficiency of rotating equipment can be improved.

FIGS. 1A and 1B are a top view and a side view showing a rotating device according to an embodiment. It is the sectional view on the AA line of Fig.1 (a). 3A and 3B are a top view and a bottom view showing the chassis and the base. It is a top view which shows a base and its periphery. It is a bottom view which shows a base and its periphery. It is a bottom view which shows a base and its periphery. It is the BB sectional view taken on the line of FIG. FIG. 8 is an explanatory diagram for explaining the shape of the wire hole, the cutout of the insulating sheet, and the cutout of the FPC and the positional relationship between them. Fig.9 (a) is CC sectional view taken on the line of FIG. FIG. 9B is a cross-sectional view taken along the line DD of FIG. It is a figure which shows the bottom recessed part of the base which concerns on a modification.

  Hereinafter, the same or equivalent components and members shown in the respective drawings are denoted by the same reference numerals, and repeated descriptions thereof are omitted as appropriate. In addition, the dimensions of the members in each drawing are appropriately enlarged or reduced for easy understanding. Also, in the drawings, some of the members that are not important for describing the embodiment are omitted.

  The rotating device according to the embodiment is suitably used as a disk drive device, particularly a hard disk drive that mounts a magnetic recording disk and rotationally drives it.

1A and 1B show a rotating device 100 according to an embodiment. FIG. 1A is a top view of the rotating device 100. FIG. 1B is a side view of the rotating device 100. FIG. 1A shows a state in which the top cover 2 is removed in order to show the inner configuration of the rotating device 100. The rotating device 100 includes a fixed body, a rotating body that rotates with respect to the fixed body, a magnetic recording disk 8 that is attached to the rotating body, and a data read / write unit 10. The fixed body includes the chassis 4, the top cover 2, and six screws 20. The rotating body includes a clamper 36 and a disk fixing screw 38.
Hereinafter, the side on which the rotating body is mounted on the chassis 4 will be described as the upper side. A direction parallel to the rotation axis R of the magnetic recording disk 8 is defined as an axial direction, an arbitrary direction passing through the rotation axis R on a plane perpendicular to the rotation axis R is defined as a radial direction, and a direction far from the rotation axis R in the radial direction. A description will be given assuming that the outer peripheral side, the side closer to the rotation axis R, is the inner peripheral side, and the direction along the circumference of a circle centered on the rotation axis R and perpendicular to the rotation axis R is the circumferential direction. These notations do not limit the posture in which the rotating device 100 is used, and the rotating device 100 can be used in an arbitrary posture.

  The magnetic recording disk 8 is a glass 2.5-inch magnetic recording disk having a diameter of 65 mm, and the diameter of the hole in the center is 20 mm and the thickness is 0.65 mm. The magnetic recording disk 8 is mounted on a hub 28 (not shown in FIG. 1) and rotates as the hub 28 rotates. The clamper 36 is pressed against the upper surface of the hub 28 by a disk fixing screw 38 and presses the magnetic recording disk 8 against the disk mounting surface of the hub 28.

  The chassis 4 is formed by die casting an aluminum alloy. The chassis 4 includes a bottom plate portion 4a having a substantially rectangular shape in plan view that forms the bottom portion of the rotating device 100, and an outer peripheral wall portion formed along the outer periphery of the bottom plate portion 4a so as to surround the mounting area of the magnetic recording disk 8. 4b. Six screw holes 22 are provided in the upper surface 4c of the outer peripheral wall 4b. The chassis 4 may be formed by pressing from a steel plate or an aluminum plate.

  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 magnetic recording disk 8, and reads data from the magnetic 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 chassis 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 on the upper surface of the magnetic 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.

  The top cover 2 is fixed to the upper surface 4 c of the outer peripheral wall portion 4 b of the chassis 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 rotating device 100. Here, specifically, the inside of the rotating device 100 is a clean space 24 surrounded by the bottom plate portion 4 a of the chassis 4, the outer peripheral wall portion 4 b of the chassis 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 magnetic recording disk 8 is suppressed, and the operation reliability of the rotating device 100 is improved.

  FIG. 2 is a cross-sectional view taken along line AA in FIG. The cross section shown in FIG. 2 corresponds to a half cross section of the drive portion of the rotating device 100. In FIG. 2, the display of the clamper 36 and the disk fixing screw 38 is omitted. The rotating body further includes a shaft 26, a hub 28, and a magnet 32. The fixed body further includes a base 5, a core support 30, a stator core 40, a coil 42, a sleeve 44, a housing 46, an insulating sheet 48, a suction plate 50, a flexible printed circuit board (FPC). , Hereinafter referred to as FPC) 84. Lubricant 52 is continuously interposed in a part of the gap between the rotating body and the fixed body.

  The hub 28 is formed by cutting or pressing a steel material having soft magnetism such as SUS430, or by pressing after pressing, and is formed into a substantially cup-shaped predetermined shape. In order to suppress peeling of the surface of the hub 28, a surface layer forming process such as electroless nickel plating may be performed on the surface of the hub 28.

  The hub 28 includes a hub protrusion 28a that fits in the central hole 8a of the magnetic recording disk 8, a mounting portion 28b that is provided radially outward from the hub protrusion 28a, and a lower surface 28j of the hub protrusion 28a. And a hanging part 28c that surrounds the housing 46. The magnetic recording disk 8 is placed on a disk placement surface 28d that is the upper surface of the placement portion 28b. The magnetic recording disk 8 is fixed to the hub 28 by being sandwiched between a clamper 36 (not shown in FIG. 2) and a mounting portion 28b.

  An annular hub recess 28g that is recessed axially upward is formed on the outer side in the radial direction of the lower surface 28f of the mounting portion 28b. In other words, an annular convex portion protruding toward the base 5 is formed on the radially inner side of the lower surface 28f of the placement portion 28b.

  The shaft 26 is formed by cutting, polishing, or grinding a steel material that is harder than the raw material of the hub 28, such as SUS420J2. The shaft 26 extends around the rotation axis R. A shaft hole 28e centering on the rotation axis R is formed in the hub protrusion 28a. The upper end of the shaft 26 is inserted into the shaft hole 28e and fixed by adhesion, press fitting, or a combination thereof. The shaft 26 has an annular flange portion 26a formed on the lower end side of the shaft 26 and projecting outward in the radial direction.

  The magnet 32 is a cylindrical member that is bonded and fixed to a cylindrical inner peripheral surface 28 h corresponding to a cylindrical surface inside the hub 28. The magnet 32 includes, for example, a neodymium rare earth magnet material. The magnet 32 may include another type of rare earth magnet material or ferrite magnet material. The magnet 32 may include a binder such as a polyamide resin. The magnet 32 faces the nine salient poles 40b of the stator core 40 in the radial direction. The magnet 32 is provided with 12 driving magnetic poles in the circumferential direction. A surface film is provided on the surface of the magnet 32 by electrodeposition coating or spray coating.

  The stator core 40 has an annular portion 40a and nine salient poles 40b extending radially outward therefrom. The stator core 40 is formed by, for example, laminating thin electromagnetic steel sheets having a thickness in the range of 0.1 mm to 0.8 mm in the range of 2 to 32 sheets. In the present embodiment, the stator core 40 is formed by laminating six thin magnetic steel sheets having a thickness of 0.35 mm and integrating them by caulking. A surface film by electrodeposition coating or powder coating is provided on the surface of the stator core 40. A coil 42 is wound around each salient pole 40 b of the stator core 40. When a three-phase substantially sinusoidal drive current flows through the coil 42, a drive magnetic flux is generated along the salient pole 40b. The stator core 40 may be formed by solidifying magnetic powder such as a sintered body.

  The coil 42 is formed by winding the wire around each of the salient poles 40b of the stator core 40 as many times as necessary. The wire starts to be wound around a certain salient pole 40b from the lower side and is continuously wound from the upper side on the salient pole 40b that should bear the same phase as the salient pole 40b in the three-phase driving. The wire at the end of winding (hereinafter referred to as “drawer wire 86”) is drawn out below the salient pole 40b.

  The base 5 is formed by cutting a nonmagnetic stainless steel base material such as SUS303. Note that the base 5 may be formed by pressing and cutting the base 5. The base 5 includes an inner portion 5a surrounding the housing 46, an intermediate portion 5b surrounding the inner portion 5a, and an outer portion 5c surrounding the intermediate portion 5b. The base 5 may be integrally formed with the chassis 4 from an aluminum alloy.

  The inner portion 5a has an annular base protrusion 5d centered on the rotation axis R. The base protruding portion 5 d protrudes toward the hub 28 so as to surround the housing 46. The stator core 40 is fixed to the base 5 by fitting the center hole 40c of the annular portion 40a of the stator core 40 to the outer peripheral surface 5e of the base protruding portion 5d. In particular, the annular portion 40a of the stator core 40 is press-fitted into the base protruding portion 5d or bonded and fixed by clearance fitting. The adhesive that fixes the stator core 40 may include a phosphor.

  The intermediate portion 5b faces the stator core 40, the coil 42, and the magnet 32 in the axial direction. The upper surface 5f of the intermediate portion 5b has a flat shape. An insulating sheet 48 made of resin such as PET is provided on a portion of the upper surface 5f of the intermediate portion 5b that faces the stator core 40 and the coil 42 in the axial direction.

  The intermediate portion 5b is formed with four wire holes 5i that connect the upper surface 5f and the lower surface 5h opposite to the upper surface 5f. The lead wire 86 is drawn to the lower surface 5h side of the base 5 through the wire hole 5i.

  An annular base recess 5g with the rotation axis R as the center is formed on the radially outer side of the intermediate portion 5b. The base recess 5g is recessed downward. At least a part of the base recess 5g faces the magnet 32 in the axial direction. An annular suction plate 50 made of a magnetic material such as iron is provided in the base recess 5g. The suction plate 50 is fixed to the bottom of the base recess 5g by caulking or bonding. The base recess 5g and the suction plate 50 are configured such that the upper surface 50a of the suction plate 50 does not protrude upward beyond the upper surface 5f of the intermediate portion 5b in a state where the suction plate 50 is accommodated in the base recess 5g. Since the suction plate 50 attracts the magnet 32 by a magnetic force, a downward force in the axial direction is applied to the magnet 32. This force is a force that suppresses lifting of the rotating body during rotation of the rotating body.

  The outer portion 5c is formed so as to protrude above the upper surface 5f of the intermediate portion 5b. A part of the outer portion 5c enters the hub recess 28g. As a result, the gap 62 between the outer portion 5c and the placement portion 28b becomes relatively narrow, the distance becomes long, and a bent portion is provided. That is, the passage resistance of the gap 62 is relatively large. Therefore, the gap 62 functions as a labyrinth against the vapor of the lubricant 52 evaporated from the gas-liquid interface 58 (described later), and suppresses the lubricant 52 that has become a gas from reaching the magnetic recording disk 8.

  A bottom recess 5 m is formed on the lower surface 5 h of the base 5. The bottom recess 5m is recessed upward. A part of the FPC 84 is accommodated in the bottom recess 5m. The lead wire 86 is bent on the wire hole 5 i, extends along the lower surface 5 h of the base 5, and is electrically connected to the corresponding drive wiring of the FPC 84. This connection is realized by soldering.

  The core support portion 30 is a cylindrical member formed of a softer material than the base 5, for example, a resin such as polyacetal or PBT (polybutylene terephthalate). The core support portion 30 is fixed to the outer peripheral surface 5e of the base protruding portion 5d by, for example, adhesion in a state where the lower surface 30b is in contact with the intermediate portion 5b. When the stator core 40 is fitted to the base protruding portion 5d, the stator core 40 is fitted to the base protruding portion 5d until the stator core 40 contacts the upper surface 30a of the core support portion 30. Therefore, the stator core 40 is supported by the core support portion 30.

  In the bottom plate portion 4a of the chassis 4, a base hole 4d that is a through hole centered on the rotation axis R is formed. The base 5 is fixed to the chassis 4 by fitting the outer portion 5c into the base hole 4d. On the peripheral surface of the base hole 4d, an annular projecting portion 4e projecting radially inward is formed. When the outer portion 5c is fitted into the base hole 4d, the outer portion 5c is inserted into the base hole 4d until the upper surface 5j of the outer portion 5c contacts the lower surface 4f of the protruding portion 4e. As a result, the axial positioning of the base 5 with respect to the chassis 4 is relatively easy.

  The housing 46 is fixed to a through hole 5k centered on the rotation axis R provided in the inner portion 5a by adhesion. The housing 46 has a bottomed cup shape in which a cylindrical portion 46a and a bottom portion 46b are integrally formed, and is fixed to the base 5 with the bottom portion 46b facing down.

  The sleeve 44 is a cylindrical member fixed to the inner peripheral surface 46c of the cylindrical portion 46a of the housing 46 by, for example, adhesion. The sleeve 44 surrounds the shaft 26 via the lubricant 52. Between the lower surface 44 b of the sleeve 44 and the upper surface 46 d of the bottom 46 b of the housing 46, a flange space 60 in which the flange portion 26 a of the shaft 26 is accommodated is formed.

  A protruding portion 44 a protruding outward in the radial direction is formed at the upper end of the sleeve 44. As will be described later, a first thrust dynamic pressure generating groove 74 is formed on the upper surface of the sleeve 44 including the upper surface of the overhanging portion 44a. Therefore, by providing the overhanging portion 44a, the first thrust dynamic pressure generating groove 74 can be formed at a position relatively far from the rotation axis R, and the bearing rigidity can be increased.

  A lubricant 52 is filled in a gap between the shaft 26 and the hub 28 that are a part of the rotating body and the sleeve 44 and the housing 46 that are a part of the fixed body. The lubricant 52 includes a phosphor. When the lubricant 52 is irradiated with predetermined light such as ultraviolet rays, the lubricant 52 emits, for example, blue or green light having a wavelength different from that of the irradiated light due to the action of the phosphor. The manufacturing process of the rotating device 100 includes the step of inspecting the position of the liquid surface of the lubricant 52 by irradiating the liquid surface of the lubricant 52 with predetermined light and detecting the emitted light of the phosphor of the lubricant 52. May be included. Further, a step of inspecting leakage of the lubricant 52 by irradiating the rotating device 100 after assembly with predetermined light and detecting the emitted light of the phosphor of the lubricant 52 may be included.

  Between the hanging portion 28c and the housing 46, there is a taper seal 56, which is a portion where a gap 54 between the inner peripheral surface 28i of the hanging portion 28c and the outer peripheral surface 46e of the upper portion of the housing 46 gradually expands downward. It is formed. In particular, the inner peripheral surface 28i of the hanging portion 28c is formed so as to be substantially parallel to the rotation axis R, and the outer peripheral surface 46e of the upper portion of the housing 46 is formed so as to have a smaller diameter toward the upper side. Is realized. The taper seal 56 has a gas-liquid interface 58 of the lubricant 52. That is, the gas-liquid interface 58 of the lubricant 52 is in contact with both the inner peripheral surface 28 i of the hanging part 28 c and the outer peripheral surface 46 e of the upper portion of the housing 46. The taper seal 56 suppresses leakage of the lubricant 52 due to a capillary phenomenon.

  On the inner peripheral surface 44d of the sleeve 44, a pair of herringbone-shaped or spiral-shaped first radial dynamic pressure generating grooves 68 and second radial dynamic pressure generating grooves 70 which are spaced apart from each other are formed. The first radial dynamic pressure generating groove 68 is formed above the second radial dynamic pressure generating groove 70. The first radial dynamic pressure generating groove 68 may be formed on the outer peripheral surface 26 b of the shaft 26 instead of the inner peripheral surface 44 d of the sleeve 44 or in addition to the inner peripheral surface 44 d of the sleeve 44. Similarly, the second radial dynamic pressure generating groove 70 may be formed on the outer peripheral surface 26 b of the shaft 26 instead of the inner peripheral surface 44 d of the sleeve 44 or in addition to the inner peripheral surface 44 d of the sleeve 44.

  A first thrust dynamic pressure generating groove 74 having a herringbone shape or a spiral shape is formed on the upper surface 44 c of the sleeve 44. The first thrust dynamic pressure generating groove 74 may be formed on the lower surface 28j of the hub protrusion 28a instead of the upper surface 44c of the sleeve 44 or in addition to the upper surface 44c of the sleeve 44.

  A second thrust dynamic pressure generating groove 78 having a herringbone shape or a spiral shape is formed on the upper surface 26c of the flange portion 26a. The second thrust dynamic pressure generating groove 78 may be formed on the lower surface 44b of the sleeve 44 instead of the upper surface 26c of the flange portion 26a or in addition to the upper surface 26c of the flange portion 26a.

  A third thrust dynamic pressure generating groove 82 having a herringbone shape or a spiral shape is formed on the lower surface 26d of the flange portion 26a. The third thrust dynamic pressure generating groove 82 may be formed on the upper surface 46d of the bottom 46b of the housing 46 instead of the lower surface 26d of the flange portion 26a or in addition to the lower surface 26d of the flange portion 26a.

  When the rotating body rotates with respect to the fixed body, the first radial dynamic pressure generating groove 68, the second radial dynamic pressure generating groove 70, the first thrust dynamic pressure generating groove 74, the second thrust dynamic pressure generating groove 78, and the third Each of the thrust dynamic pressure generation grooves 82 generates a dynamic pressure in the lubricant 52. With this dynamic pressure, the rotating body is supported in the radial direction and the axial direction without contacting the fixed body.

  FIGS. 3A and 3B show the chassis 4 and the base 5. FIG. 3A is a top view of the chassis 4 and the base 5. FIG. 3B is a bottom view of the chassis 4 and the base 5. On the lower surface 4g of the bottom plate portion 4a, a first rib 4i extending along one long side of the bottom plate portion 4a, a second rib 4j extending along the other long side, and a first rib 4i A third rib 4k extending substantially orthogonally and a fourth rib 4l extending substantially orthogonally to the second rib 4j are formed. At least one of the third rib 4k and the fourth rib 4l is formed closer to the data read / write unit 10 than the rotation axis R. In the present embodiment, both the third rib 4k and the fourth rib 4l are formed closer to the data read / write unit 10 than the rotation axis R.

  FIG. 4 is a top view showing the base 5 and its periphery. FIG. 4 shows a state in which the insulating sheet 48 is attached to the base 5. The four wire holes 5i are formed at equal intervals in the circumferential direction. In the present embodiment, the wire holes 5i are formed at intervals of 40 degrees in the circumferential direction. In addition, the space | interval of the wire hole 5i is not restricted to this. Moreover, the wire holes 5i may be formed at non-uniform intervals in the circumferential direction. The wire hole 5 i is formed on the side farther from the data read / write unit 10 than the rotation axis R.

  The insulating sheet 48 has an annular shape. A cutout 48a is formed in the insulating sheet 48 at a position corresponding to each of the four wire holes 5i, that is, above each of the four wire holes 5i. The notch 48a is formed by notching the insulating sheet 48 radially inward from the outer periphery 48b side.

  5 and 6 are bottom views showing the base 5 and its periphery. FIG. 5 shows a state before the FPC 84 is attached. FIG. 6 shows a state where the FPC 84 is pasted. FIG. 7 is a cross-sectional view taken along the line BB in FIG. 6, that is, a cross-sectional view of the base 5 in the circumferential direction passing through the center of the wire hole 5i. The bottom recess 5m has a substantially arc shape in plan view. The bottom recess 5m is formed so as to include regions facing each other across the rotation axis R. Specifically, the bottom recess 5m is formed so as to extend in the circumferential direction over an angular range of 180 ° to 330 ° with the rotation axis R as the center. Here, the angular range in which the bottom recess 5m extends in the circumferential direction refers to a line segment passing through one endmost portion E1 and the rotation axis R in the circumferential direction of the bottom recess 5m and the other in the circumferential direction of the bottom recess 5m. The angle θ1 formed by the line segment passing through the most end portion E2 and the rotation axis R is referred to.

  The bottom recess 5m includes a first recess 5n and a second recess 5p that are continuously provided in the circumferential direction. The first recess 5n is recessed above the second recess 5p. That is, the first recess 5n is recessed deeper than the second recess 5p. The first recess 5n extends in the circumferential direction over an angular range of 150 ° to 210 ° with the rotation axis R as the center. Here, the angular range in which the first recess 5n extends in the circumferential direction refers to a line segment passing through one endmost portion E3 and the rotation axis R in the circumferential direction of the first recess 5n, and the circumference of the first recess 5n. An angle θ2 formed by a line segment passing through the other end portion E4 in the direction and the rotation axis R is referred to. Openings 5q on the lower surface 5h side of the plurality of wire holes 5i are formed at the bottom of the first recess 5n. The second recess 5p is formed closer to the data read / write unit 10 than the rotation axis R. The second recess 5p includes a portion facing a part of the first recess 5n with the rotation axis R in between.

  The bottom recess 5m is provided with a surface coating by resin coating such as epoxy resin. Alternatively, the surface coating may be a coating by plating a metal material such as nickel or chromium. On the other hand, the top of the outer peripheral wall 5v that forms the bottom recess 5m may be an exposed surface having no surface coding. The end surface of the inner peripheral wall 5w that forms the bottom recess 5m may be an exposed surface that does not have surface coding. At least one of the top portion of the outer peripheral wall 5v and the end surface of the inner peripheral wall 5w may be, for example, a cutting surface from which the surface coating has been removed.

  A chassis recess 4h communicating with the second recess 5p of the bottom recess 5m is formed on the lower surface 4g of the bottom plate portion 4a of the chassis 4. In particular, the chassis recess 4h is formed at a position avoiding the portion of the bottom plate portion 4a facing the data read / write unit 10 in the axial direction. Since the portion of the bottom plate portion 4a facing the data read / write portion 10 in the axial direction is formed relatively thin, the rigidity of the bottom plate portion 4a is reduced by forming the chassis recess 4h at a position avoiding this portion. Can be suppressed.

  The FPC 84 is provided on a substantially arcuate arc portion 84a, an extending portion 84b extending radially outward from an outer periphery on one end side in the circumferential direction of the arc portion 84a, and radially outward of the extending portion 84b. ) And the like, and is formed in a question mark shape in plan view.

  The arc portion 84a is formed so as to include regions facing each other across the rotation axis R. More specifically, the arc portion 84a is formed so as to extend in the circumferential direction around an angle range of 180 ° to 330 ° with the rotation axis R as the center. Here, the angular range in which the arc portion 84a extends in the circumferential direction refers to a line segment passing through one end portion E5 and the rotation axis R in the circumferential direction of the arc portion 84a, and the other in the circumferential direction of the arc portion 84a. An angle θ3 formed by a line segment passing through the most end portion E5 and the rotation axis R is referred to. The arc portion 84a is accommodated in the bottom recess 5m.

  In the arc portion 84a, a notch 84d is formed at a position corresponding to each of the four wire holes 5i, that is, below each of the four wire holes 5i. The cutout 84d is formed by cutting out the arc portion 84a from the inner periphery 84e side toward the radial direction outer side. The lead wire 86 is drawn to the lower surface 5h side through the notch 48a of the insulating sheet 48, the wire hole 5i, and the notch 84d of the FPC 84. FIGS. 6 and 7 show an example in which four lead wires 86a, 86b, 86c, 86d corresponding to the U phase, V phase, W phase, and common are drawn to the lower surface 5h side.

  The arc portion 84a is provided with four connection lands 88a, 88b, 88c, and 88d. In particular, the four connection lands 88a to 88d are provided at positions separated from the wire hole 5i in the circumferential direction. In the present embodiment, the four connection lands 88a to 88d are provided on the same side in the circumferential direction with respect to the wire hole 5i. The four lead wires 86a to 86d drawn to the lower surface 5h side are bent on the wire hole 5i, extend in the circumferential direction, and are soldered to the corresponding connection lands 88a to 88d.

  The four connection lands 88a, 88b, 88c, 88d are electrically connected to the drive wirings 92a, 92b, 92c, 92d, respectively. The drive wirings 92a, 92b, 92c, and 92d extend from the arc portion 84a through the extending portion 84b to the power supply portion 84c and are electrically connected to terminals 90a, 90b, 90c, and 90d provided on the power supply portion 84c, respectively. Is done.

  An adhesive 64 is applied to the first recess 5n so as to close the opening 5q of the wire hole 5i. Thereby, leak-in to the clean space 24 through the wire hole 5i and leak-out from the clean space 24 through the wire hole 5i are suppressed. The adhesive 64 is applied with the base 5 turned upside down as shown in FIG. 7, that is, with the lower surface 5h of the base 5 facing upward. At this time, an appropriate amount of adhesive 64 is applied to the first recess 5n so as not to protrude beyond the bottom 5x of the second recess 5p to the lower surface 5h side (upper side in FIG. 7). The adhesive 64 is applied so that the wires 86a to 86d drawn to the lower surface 5h side are not exposed. The adhesive 64 is applied so as to cover the bottom of the first recess 5n from the outer peripheral wall 5v to the inner peripheral wall 5w.

  Next, the relationship among the wire hole 5i, the notch 48a of the insulating sheet 48, and the notch 84 of the FPC 84 will be described. FIG. 8 is a top view showing the periphery of the wire hole 5i. FIG. 8 can also be said to be a diagram in which the base 5, the insulating sheet 48, and the FPC 84 are projected onto a certain plane orthogonal to the rotation axis R. Fig.9 (a) is CC sectional view taken on the line of FIG. FIG. 9B is a cross-sectional view taken along the line DD of FIG.

  As shown in FIG. 8, the notch 48a and the notch 84d are configured such that the region 94 surrounded by them does not overlap the base 5 in the axial direction. In other words, the notch 48a and the notch 84d are configured such that the region 94 surrounded by them is surrounded by the wire hole 5i. In this case, as shown in FIGS. 9A and 9B, it is possible to prevent the lead wire 86 and the base 5 from coming into direct contact. That is, the lead wire 86 can be pulled out to the lower surface 5 h side of the base 5 while insulation between the base 5 and the lead wire 86 (and thus the coil 42) is achieved. In addition, it is possible to obtain an insulating effect similarly if a through hole is formed in the insulating sheet 48 and the FPC 84 instead of the notch, but if the notch is formed, the processing cost of the insulating sheet 48 and the FPC 84 is correspondingly reduced. Can be suppressed.

  The operation of the rotating device 100 configured as described above will be described. In order to rotate the magnetic recording disk 8, a three-phase drive current is supplied to the coil 42 via the FPC 84. When the drive current flows through the coil 42, magnetic flux is generated along the nine salient poles. Torque is applied to the magnet 32 by this magnetic flux, and the hub 28 and the magnetic 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 magnetic recording disk 8. The recording / reproducing head converts the magnetic data recorded on the magnetic 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 recorded on the magnetic recording disk 8. Is written as magnetic data.

  According to the rotating device 100 according to the present embodiment, the bottom recess 5m is formed so as to include regions facing each other across the rotation axis R. Therefore, the space | interval in the circumferential direction of each wire hole 5i can be made comparatively large. As a result, the connection lands 88a to 88d can be provided at positions separated from the wire hole 5i in the circumferential direction.

Here, when soldering the wire to the connection land, the heating time required for heating the wire is shortened by bringing the soldering iron into contact with the wire in parallel, so that the heating time required for the wire is shortened. It was confirmed that the efficiency was improved.
Therefore, when soldering the lead wires 86a to 86d to the connection lands 88a to 88d, soldering is performed by putting a soldering iron parallel to the extending direction of the lead wires 86a to 86d. That is, for example, when the lead wires 86a to 86d extend outward in the radial direction, soldering is performed by inserting a soldering iron from the outer side in the radial direction. Therefore, when the connection land is provided at a position spaced apart from the wire hole 5i in the radial direction, the lead wire 86 extends in the radial direction from the wire hole 5i. A soldering iron is put in and soldered. In this case, the outer peripheral wall 5v of the bottom concave portion 5m interferes with the soldering iron, the soldering iron stands and it takes a long time for heating the wire, which may lead to a reduction in work efficiency. On the other hand, in the present embodiment, connection lands 88 are provided in the circumferential direction with respect to the wire hole 5i, and the lead wire 86 extends in the circumferential direction from the wire hole 5i. Therefore, soldering is performed by inserting a soldering iron in the circumferential direction with respect to the connection land 88. In this case, since the peripheral wall of the bottom concave portion 5m hardly interferes with the soldering iron, the working efficiency is improved.

  When the angle range of the circular arc part 84a is 180 ° or more, it was confirmed that the connection land 88 can be provided in the circumferential direction with respect to the wire hole 5i. When the angle range of the arc portion 84a is 230 ° or more, the interval between the connection lands 88a to 88d is widened, and the possibility that the soldering iron placed in one connection land contacts the adjacent connection land is reduced. The When the angle range of the arc portion 84a is 280 ° or more, the interval between the connection lands 88a to 88d is widened, and the work efficiency of the wire end processing is improved. When the angle range of the arc portion 84a is 330 ° or less, the moving distance of the soldering iron when the lead wires 86a to 86d are continuously soldered is shortened, and the working efficiency is improved.

  Further, according to the rotating device 100 according to the present embodiment, the connection lands 88a to 88d are configured to be located on the same side in the circumferential direction with respect to the wire hole 5i. Therefore, the moving distance of the soldering iron when the lead wires 86a to 86d are continuously soldered is shortened, and the working efficiency is improved.

  Further, according to the rotating device 100 according to the present embodiment, the first recess 5n formed with the opening 5q on the lower surface 5h side of the wire hole 5i is formed to be deeper than the second recess 5p communicating with the chassis recess 4h. Is done. An adhesive 64 is applied to the first recess 5n so as to close the opening 5q of the wire hole 5i. The adhesive 64 is applied with the lower surface 5h of the base 5 facing upward. In particular, an appropriate amount of adhesive 64 is applied to the first recess 5n so as not to protrude beyond the bottom 5x of the second recess 5p toward the lower surface 5h. In this case, the adhesive 64 is blocked by the slope portion from the first recess 5n to the second recess 5p, and the adhesive 64 is prevented from flowing out to the second recess 5p and thus to the chassis 4. In this way, the first recess 5n in which the opening 5q is formed is formed so as to be deeper than the second recess 5p communicating with the chassis recess 4h, thereby preventing the adhesive 64 from flowing out to the chassis recess 4h. Is possible.

  According to the rotating device 100 according to the present embodiment, the first rib 4i, the second rib 4j, the third rib 4k, and the fourth rib 4l are formed on the lower surface 4g of the chassis 4. Thereby, the rigidity of the chassis 4, particularly the rigidity around the rotation axis R of the chassis 4 is improved.

  The configuration and operation of the rotating 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. Also, combinations of the embodiments are possible.

(Modification 1)
In the embodiment, a so-called outer rotor type rotating device in which the magnet 32 is located outside the stator core 40 has been described, but the present invention is not limited thereto. For example, it may be a so-called inner rotor type rotating device in which the magnet is positioned inside the stator core.

(Modification 2)
In the embodiment, the case where the number of salient poles of the stator core 40 is nine has been described, but the present invention is not limited to this. For example, the number of salient poles of the stator core 40 may be six. In this case, the labor for forming the coil 42 can be reduced. The number of salient poles of the stator core 40 may be an integer multiple of 3 from 12 to 36, for example. In this case, the number of turns of the coil 42 can be increased.

(Modification 3)
In the embodiment, the case where the magnet 32 is magnetized for driving with 12 poles has been described, but the present invention is not limited to this. The magnet 32 may be magnetized for driving with even numbers of poles, for example, 8 to 16. These descriptions are merely examples, and the number of driving magnetic poles is not limited to these ranges.

(Modification 4)
The notation of SUS430, SUS303, and SUS420J2 in the description of the embodiment indicates the type of stainless steel according to JIS. These notations are merely examples, and members formed from SUS430, SUS303, and SUS420J2 in the description of the embodiment are made of other metal materials or resin materials that satisfy the design specifications instead of SUS430, SUS303, and SUS420J2. It may be formed.

(Modification 5)
In the embodiment, the case where the lead wire 86 is soldered to the FPC 84 as a wiring member has been described. However, the present invention is not limited to this. Other types of wiring means such as a rigid printed board and a connector may be adopted as the wiring member. Further, for example, a member obtained by combining a plurality of wiring means may be adopted as the wiring member. Further, instead of soldering, other types of connection means such as welding or adhesion may be employed.

(Modification 6)
In the embodiment, the case where the sleeve 44 is fixedly provided on the base 5 and the shaft 26 rotates together with the hub 28 has been described. However, the present invention is not limited to this. For example, a configuration in which the shaft is fixedly provided on the base and the sleeve rotates together with the hub may be employed.

(Modification 7)
Although not particularly mentioned in the embodiment, the bottom recess 5m may be formed so that the bottom of the first recess 5n and the bottom of the second recess 5p are smoothly connected. FIG. 10 shows a bottom recess 5m of the base according to the modification. The bottom recess 5m includes a first recess 5n and a second recess 5p.

  The first recess 5n includes a rectangular recess 5r and a connection recess 5s. The connection recess 5s smoothly connects the rectangular recess 5r and the second recess 5p having different depths. In the present embodiment, the connection portion 5t connected to the bottom of the rectangular recess 5r among the bottoms of the connection recess 5s is formed in a curved surface having a predetermined curvature. In this case, the FPC 84 can be brought into close contact with the bottom of the rectangular recess 5r and the bottom of the connection recess 5s, and air can be prevented from entering between the FPC 84 and the bottom of the rectangular recess 5r and the bottom of the connection recess 5s. Note that the curvature of the connecting portion 5t is determined by the flexibility of the FPC 84. For example, this curvature may be determined by experiment. Similarly, the connection portion 5u connected to the bottom of the second recess 5p among the bottoms of the connection recess 5s is formed in a curved surface having a predetermined curvature. In this case, the FPC 84 can be brought into close contact with the bottom of the second recess 5p and the bottom of the connection recess 5s, and air can be prevented from entering between the bottom of the FPC 84 and the second recess 5p and the bottom of the connection recess 5s. .

  If there is a gap between the FPC 84 and the first concave portion 5n or the second concave portion 5p, and air has entered there, the air is applied to the surface of the adhesive in the process of solidifying the adhesive applied to the first concave portion 5n. To surface. As a result, a bubble hole is formed on the surface of the adhesive, and the beauty of the rotating device is lost. On the other hand, according to this modification, the FPC 84 can be brought into close contact with the bottom of the first recess 5n and the bottom of the second recess 5p. In other words, it is possible to prevent a gap from being formed between the FPC 84 and the bottom of the first recess 5n or the bottom of the second recess 5p, and air is generated between the FPC 84 and the bottom of the first recess 5n or the bottom of the second recess 5p. You can deter entry. Therefore, the formation of bubble holes on the surface of the adhesive during the process of solidifying the applied adhesive is suppressed, and a good aesthetic appearance of the rotating device can be maintained.

  4 chassis, 5 base, 5i wire hole, 5m bottom recess, 5n first recess, 5p second recess, 5q opening, 8 magnetic recording disk, 10 data read / write section, 26 shaft, 28 hub, 30 core support section, 32 magnet, 40 stator core, 40a annular part, 40b salient pole, 42 coil, 44 sleeve, 46 housing, 48 insulation sheet, 50 suction plate, 52 lubricant, 84 FPC, 84a arc part, 86 lead wire, 88 connection land , 92 drive wiring, 100 rotating equipment, R rotating shaft.

Claims (8)

A hub on which the recording disk should be placed;
A base that rotatably supports the hub via a bearing;
A core fixed to the base and having an annular portion and a plurality of salient poles extending radially therefrom;
A coil formed by being wound around the plurality of salient poles;
A wiring board including drive wiring, and
The base is formed with a wire hole that communicates the first surface facing the coil in the axial direction and the second surface opposite to the first surface. The surface is provided with an encircling recess having a substantially arc-shaped arc region including a region surrounding the rotating shaft of the hub and facing the rotating shaft.
The wiring board includes a substantially arc-shaped arc section accommodated in the arc region,
The coil drawing wire is drawn out to the second surface side through the wire hole, and is connected to the drive wiring at a connection land provided in the arc section so as to be spaced apart from the wire hole in the circumferential direction. Features rotating equipment.   2. The rotating device according to claim 1, wherein the arc section extends in the circumferential direction over an angular range of 180 ° to 330 ° around the rotation axis. The surrounding recess includes a first recess and a second recess having a depth smaller than that of the first recess, which are continuously provided in the circumferential direction.
The rotating device according to claim 1, wherein the opening of the wire hole is formed in the first recess.   4. The rotating device according to claim 3, wherein the first recess extends in a circumferential direction over an angle range of 150 ° to 210 ° with the rotation axis as a center. 5.   The said 2nd surface is a periphery of the top part of the outer peripheral wall which forms the said surrounding recessed part, Comprising: The part which has an insulating layer in the surface which avoided the said top part is characterized by the above-mentioned. Rotating equipment as described in The base includes a bottom portion having a substantially rectangular shape in a plan view including a region where the recording / reproducing head is to be provided, and a peripheral annular wall portion protruding in an axial direction from a peripheral edge of the bottom portion
6. The rotating device according to claim 1, wherein the wire hole is formed on a side farther from a region where a recording / reproducing head is to be provided than the rotating shaft in a longitudinal direction of the bottom portion. . The base includes a bottom portion having a substantially rectangular shape in a plan view including a region where the recording / reproducing head is to be provided, and a peripheral annular wall portion protruding in an axial direction from a peripheral edge of the bottom portion
5. The rotating device according to claim 3, wherein the second concave portion is formed on a side closer to a region where a recording / reproducing head is to be provided than the rotating shaft in a longitudinal direction of the bottom portion.   8. The rotating device according to claim 6, wherein the bottom portion has a rib on a side closer to a region where the recording / reproducing head is to be provided than the rotating shaft in the longitudinal direction.

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