JPH06119756A - Driving device for recording disk - Google Patents

Abstract

PURPOSE:To prevent the lifting of a flexible circuit board from a base plate at least from a spindle motor part to the outer periphery of a recording disk, to suppress the height of a part connecting the flexible circuit board to a terminal and to make the whole device thin. CONSTITUTION:The pulling out part 68a of a flexible circuit board 68 stuck to the bottom surface of a stator coil 36 is pulled out in the radial direction outward through the bottom part and the peripherical surface part of an annular recessed part 14 and a second projected part 58. The tip part 68a1 of the pulling out part 68a reaches the face of a terminal 72 slightly projected from the front end part 70a of a connector 70. The engaging projected part 80 of a preventing member 78 for lifting is engaged with an engaging hole 74 and fixed on a base plate 10. The tip part 68a1 of the pulling out part 68a is elastically supported in the state that the terminal area 84 of the lower surface of the tip is pressurized in contact with a terminal 72.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a recording disk drive apparatus in which a flexible circuit board is pulled out from a spindle motor section inside a disk chamber.

[0002]

2. Description of the Related Art In a recording disk drive device, a flexible circuit board is pulled out from a spindle motor portion inside a disk chamber and a connector terminal fixed to a base of the recording disk drive device is made flexible. The spindle motor unit and the outside of the disk chamber are electrically connected by being inserted into the hole of the terminal area of the circuit board and then soldered.

In this case, if the flexible circuit board floats up from the substrate, it may cause disconnection of the conductive path of the flexible circuit board or interference with the movement of the spindle motor section and the read / write head. Further, in order to insert the solder into the hole of the terminal area of the flexible circuit board for soldering, it is necessary to project the terminals of the connector relatively high, which leads to reduction in thickness of the entire recording disk drive device. It was also an obstacle.

The present invention has been made in view of the above problems existing in the prior art, and an object thereof is to provide a flexible circuit at least from the spindle motor section to the outer peripheral section of the recording disk. Provided is a recording disk drive device capable of easily and surely preventing the substrate from being lifted from the base, and suppressing the height of a portion where a flexible circuit board is connected to a terminal, thereby reducing the thickness of the entire recording disk drive device. To do.

[0005]

In order to achieve the above object, a recording disk drive device of the present invention comprises a flexible circuit board pulled out from a spindle motor section inside a disk chamber and at least a part of which is made of an elastic material. The flexible circuit board comprises a floating prevention member configured and a terminal slightly protruding from a terminal holding portion fixed to the base, and the flexible circuit board is at least a spindle by the floating prevention member fitted to the base. From the motor part to the outer peripheral part of the recording disk, it is prevented from floating from the base, and the floating prevention member prevents the portion of the flexible circuit board having the terminal area from being pressed against the terminal. It is supposed to be held elastically.

[0006]

The flexible circuit board, which is pulled out from the spindle motor section inside the disk chamber, is fitted to the base of the recording disk drive unit by fitting the rising prevention member, at least a part of which is made of an elastic material. Lifting is prevented at least from the spindle motor part to the outer peripheral part of the recording disk, and the part of the flexible circuit board that has the terminal area changes from the terminal holding part where the terminal area is fixed to the board to the slightly protruding terminal. It is elastically held in the pressed state.

[0007]

Embodiments of the present invention will be described with reference to the drawings. 1 to 6 relate to a hard disk drive device as one embodiment of the present invention. FIG. 1 is a plan view of a disk chamber with a lid removed, and FIG.
II-II line sectional view in FIG. 3, FIG. 3 is a bottom view, FIG. 4 is FIG.
IV-IV line sectional view in FIG. 5, FIG. 5 is VO in FIG.
FIG. 6 is a right side view of a main part, which is a cross-sectional view taken along line -V. Needless to say, the recording disk drive device of the present invention is not limited to a hard disk drive.

Reference numeral 10 is a base of a hard disk drive,
Reference numeral 11 is a lid of the disc chamber 12. The base 10 has a horizontally long rectangular shape in FIG. 1, and an annular recess 1 that is open toward the disk chamber 12 with the center left thereof as the center.
4 is provided on the base 10. A cylindrical portion 16 protruding upward from the inner peripheral portion of the bottom of the annular recess 14 concentrically with the annular recess 14 constitutes an inner peripheral wall of the annular recess 14. The inner peripheral portion of the cylindrical portion 16 is a through portion.
The base 10 is forged and then cut on the disk chamber 12 side.

Reference numeral 18 is a first ball bearing, and 20 is a second ball bearing. The outer rings of the first ball bearing 18 and the second ball bearing 20 are fixed to the inner peripheral wall of the cylindrical portion 16 with an adhesive. The inner race and the outer race of the first ball bearing 18 and the second ball bearing 20 are coated with an amorphous film (not shown) of DLC (diamond-like carbon film synthesis technology). As a result, the strength and impact resistance of each ball bearing are increased to prolong the service life. The DLC amorphous film may be coated on the rolling sphere.

Reference numeral 22 is a rotor hub. Rotor hub 22
A rotary shaft 24 is provided at the center of the
Inner rings of the first ball bearing 18 and the second ball bearing 20 are fixed to the outer peripheral surface of the adhesive 4 by an adhesive. Thereby, the rotor hub 22 is concentric with the annular recess 14 and the base 10
It is rotatably supported with respect to. At the lower end of the outer peripheral wall of the rotor hub 22, an overhanging portion 26 for supporting the lower surface of the inner circumferential portion of the hard disk is provided. Below the overhanging portion 26, an annular holding plate 28 for holding a rotor magnet is provided. The inner circumference of is fixed. The holding annular plate 28 and the rotor hub 22 form a rotor frame. An outer peripheral portion of the holding annular plate 28 has a hanging portion 28a holding an annular rotor magnet 30 inside, and the hanging portion 28a and the annular recess 14 face each other with a slight radial gap. . The holding annular plate 28 is made of a soft magnetic material,
It also serves as the yoke of the rotor magnet 30 and the magnetic shield plate.

Reference numeral 34 is a stator core fixed to the outer peripheral surface of the cylindrical portion 16, reference numeral 36 is a stator coil wound around the stator core 34, and the rotor magnet 30 and the stator core 34 are opposed to each other with a radial gap therebetween. is doing.

The hanging portion 28a of the holding annular plate 28, the rotor magnet 30 (field means), the stator core 34 and the stator coil 36 (armature) are substantially annular recesses 14.
It is housed inside. The cylindrical portion 16, the rotor hub 22, the holding annular plate 28, the stator core 34, the rotor magnet 30, the hanging portion 28a, and the annular recess 14 provide a labyrinth seal effect, and the first ball bearing 18 is provided.
And the fine particles of the lubricant of the second ball bearing 20 and the like are stored in the disk chamber 12.
It can be prevented from scattering inside. In addition, the holding annular plate 28
The annular groove portion 38, which is formed between the rotor magnet 30 and the rotor magnet 30, has a radially inward opening, stores the lubricant fine particles and the like from the first ball bearing 18 and the second ball bearing 20, and the disk chamber 1
It has the effect of preventing scattering within 2. Reference numeral 40 denotes a sealing member that seals the lower end of the inner peripheral portion of the cylindrical portion 16 that is a through portion.

The hard disk drive is driven by the annular recess 14, the cylindrical portion 16, the first ball bearing 18, the second ball bearing 20, the rotor hub 22, the stator core 34, the stator coil 36, the holding annular plate 28, the rotor magnet 30 and the like. The spindle motor unit A is constructed. Since the annular recess 14, which is the stator frame of the spindle motor unit A, is integrally provided on the substrate 10, the overall height of the device can be kept low.

A hard disk 42 is attached to the rotor hub 22.
Is externally fitted, and the lower surface of the inner peripheral portion 42 a of the hard disk 42 is supported on the upper surface of the protruding portion 26. Reference numeral 44 denotes a clamp member for holding the inner peripheral portion of the hard disk 42 between itself and the overhanging portion 26 under pressure, and its outer diameter is substantially equal to the outer diameter of the overhanging portion 26. The clamp member 44 is screwed to the upper end of the rotor hub 22.

The overhanging portion 26 and the clamp member 44 constitute a disc holding portion. The outer diameter of the annular recess 14 is more than twice the outer diameter of the overhanging portion 26 and the clamp member 44, and the outer diameter of the hard disk 42 is less than three times the outer diameter of the rotor hub 22 and the clamp member 44. The outer periphery of the hard disk 42 is located slightly inside the outer edge of the base 10.

The hard disk 4 is provided between the lower surface (base side surface) of the hard disk 42 and the upper surface of the holding annular plate 28.
Among the magnetic heads 46 arranged on the upper and lower surfaces of the second magnetic head 46, there is a gap through which the lower one can come in and out.

In FIG. 1, all of the outer wall portion of the annular recess 14 and substantially the radially outer portion of the annular recess 14 in the portion on the left side of the center of the annular recess 14 in the longitudinal direction of the base 10 and the right end of the center of the annular recess 14 are almost the same. All are formed in the 1st convex part 48 of a fixed height which has a slight gap with which the magnetic head 46 cannot move in and out with the lower surface of the hard disk 42. First
The convex portion 48 has a center angle around the rotation axis of the rotor hub 22 and a center angle of about 2 around the left side portion in FIG.
Occupies 20 degrees. As shown in FIGS. 3 and 4, the back side of the first protrusion 48 of the board 10 is formed as a component storage recess 50 that opens to the outside of the disk chamber 12.
52 is a circuit board fixed to the back side of the substrate 10, 54
Are mounted on the circuit board 52, and the component storing recess 50
It is an electronic component for a control circuit housed inside.

All of the outer wall of the annular recess 14 of the base 10 except the first protrusion 48 and most of the radially outer portion thereof except the head positioning mechanism recess 56 are located on the lower surface of the hard disk 42. The magnetic head 46 is formed in the second convex portion 58 having a height that allows the magnetic head 46 to move in and out. The head positioning mechanism recess 56 is located at the front right portion in FIG. 1, and its height is, as shown in FIG.
Between the bottom surface of No. 4 and the top surface of the second convex portion 58.

Between the lower surface of the hard disk 42 and the upper surface of the holding annular plate 28, there is a gap through which the magnetic head 46 can move in and out, and the first convex portion 48 of the outer wall portion of the annular concave portion 14 of the base 10 is provided. All except hard disk 4
The magnetic head 46 can move in and out of the gap between the lower surface of the second
Since the protrusions 58 are formed, the range in which the magnetic heads 46 can be positioned on both sides of the hard disk 42 extends from the outer peripheral position of the overhanging portion 26 to the outer peripheral position of the hard disk 42 through the outer peripheral position of the annular recess 14. It is wider than the difference between the outer diameter of 42 and the outer diameter of the spindle motor portion A, that is, the outer diameter of the holding annular plate 28.

Further, the first convex portion 48 having a height having a slight gap with the lower surface of the hard disk 42 is the outer wall portion of the annular concave portion 14 of the base 10 and the rotor hub 22 of the radially outer portion thereof. It occupies about 220 degrees at the central angle around the axis of rotation, and its backside is the recess 50 for storing parts.
Since the concave portion 50 for storing the components is formed as described above, both the bottom area and the height can be made as large as possible. Therefore, it is possible to increase the recording capacity of the hard disk 42 and the capacity of the component storing recess 50 while reducing the size and thickness of the entire apparatus as much as possible.

Reference numeral 60 denotes a pivot assembly fixed to the recess 56 for the head positioning mechanism.
An arm 62 for holding a voice coil 6 and a voice coil (not shown) at the tip and the base, respectively, is rotatably supported on the base 10. Reference numeral 64 is a yoke of a voice coil motor for rotating the arm 62 to position the magnetic head 46, and 66 is a guide pin provided on the base 10 for positioning the yoke 64. A ball bearing (not shown) used for the pivot assembly 60.
As the lubricant, it is preferable to use oil rather than grease. This is for suppressing the variation in effective torque due to the voice coil motor and improving the positioning accuracy of the magnetic head 46.

A flexible circuit board 68 is adhered to the lower surface of the stator coil 36 wound around the stator core 34, and the drawn-out portion 68a of the flexible circuit board 68 is attached.
Is drawn out from the bottom of the annular recess 14 to the outside in the radial direction of the annular recess 14 via the outer peripheral surface portion of the annular recess 14 and the second protrusion 58. The tip portion 68a1 of the drawer portion 68a is
The front end portion 70a of the connector 70 fixed to the right rear portion of the board 10 in FIG. 1 reaches the terminal 72 slightly protruding. In addition to the terminals 72, the connector 70 has terminals 73 protruding higher than the terminals 72.

Reference numeral 74 is a fitting hole penetrating the base 10. A through hole is provided at a position corresponding to the fitting hole 74 in the drawer portion 68a. Reference numeral 78 is a lifting prevention member. FIG. 7 is an enlarged plan view of the lifting prevention member 78, and FIG. 8 is a central longitudinal sectional view thereof. The rising prevention member 78 responds to changes in height from the bottom and outer peripheral surface of the annular recess 14 to the second protrusion 58 and the terminal,
For example, an elastic material such as a leaf spring material is formed by bending, and a downward fitting protrusion 80 is provided at a position corresponding to the fitting hole 74.

The fitting protrusion 80 penetrates through the through hole of the pull-out portion 68a and fits into the fitting hole 74 to prevent the floating prevention member 7 from rising.
By fixing 8 to the base 10, it is possible to prevent the portion of the lead-out portion 68a of the flexible circuit board 68, which extends from the bottom and outer peripheral surface of the annular recess 14 to at least the outer peripheral position of the hard disk 42, from floating up from the base 10. There is. As a result, the conductive path of the pull-out portion 68a is broken, the rotor hub 22 rotates, and the magnetic head 4 is rotated.
Interfering with the movement of 6 is easily and reliably prevented. 8
Reference numeral 2 is a seal member for sealing the fitting hole 74.

Further, due to the lifting prevention member 78, the tip end portion 68a1 of the lead-out portion 68a of the flexible circuit board 68 and the terminal region 84 on the lower surface thereof are provided in the terminal 7.
It is elastically held in a state of being pressed against 2. The flexible circuit board 68 and the connector can be electrically connected by omitting the soldering step, and the height of the portion where the terminal area 84 of the flexible circuit board 68 is connected to the terminal 72 is inserted into the pin and soldered. In comparison with the above case, it can be suppressed, and it is also effective in reducing the thickness of the entire recording disk drive device. The thickness of the terminal region 84 is exaggerated in the drawing.

FIG. 9 is a sectional view of the main part of another hard disk drive, and FIG. 10 is a plan view of the main part of the stator core.

A fixed column 92 is erected on the base 90, and a rotor hub 98 is rotatably supported on the outer peripheral side of the fixed column 92 via upper and lower ball bearings 94 and 96.

On the outer peripheral wall of the rotor hub 98, an overhanging portion 98a for supporting the lower surface of the inner peripheral portion of the hard disk 100 is formed.
Is provided, and the inner peripheral portion of the holding annular plate 104 that holds the rotor magnet 102 is fixed to the lower side of the overhanging portion 98a. On the outer peripheral portion of the holding annular plate 104, a hanging portion 1 holding an annular rotor magnet 102 inside is provided.
04a, and the hanging portion 104a and the annular recess 106,
They are opposed to each other with a slight radial gap.

An annular protrusion 90a is provided on the base 90 on the outer peripheral side of the rotor hub 98, and the stator coil 108
The stator core 110 wound with is externally fitted and fixed. Of the teeth of the stator core 110, the tooth winding portion 110a around which the stator coil is wound has a small axial thickness in order to suppress the height of the spindle motor portion. However, the outer peripheral portion 110b of the tooth is the rotor magnet 1
In order to prevent the facing area of No. 02 from becoming small, electromagnetic steel sheets 112 are vertically stacked and fixed by caulking. As a result, it is possible to realize further thinning without significantly impairing the performance as a motor.

FIG. 11 is a cross-sectional view of an essential part of another hard disk drive. In this device, the shape of the stator core 120 is such that the inner peripheral portion is bent and extended downward and then further extended inward, and the lower end annular portion 120a of the stator core 120 is formed of the base 122. It is fitted and fixed in the fitting hole 123. Then, the fixed support 125 is fitted and fixed in the fitting hole 124 provided in the central portion of the stator core 120. Other configurations are the same as the examples shown in FIGS. 9 and 10.

The vertical positional relationship in the above description of the embodiments and the like is merely for convenience of explanation based on the drawings, and does not limit the actual use state or the like.

[0032]

According to the recording disk drive apparatus of the present invention, by mounting the anti-floating member on the substrate, the flexible circuit board is lifted from at least the spindle motor portion to the outer peripheral portion of the recording disk.
In addition, it is possible to easily and surely avoid the disconnection of the conductive path of the flexible circuit board and the disturbance to the movement of the spindle motor unit and the head, and the portion of the flexible circuit board having the terminal region is fixed to the base terminal. The terminal region can be elastically held in a state in which the terminal region is pressed against the terminal slightly protruding from the holding portion, and the terminal region and the terminal can be easily electrically connected. Unlike the prior art in which the terminal is projected relatively high for insertion and soldering and then inserted into the hole in the terminal area of the flexible circuit board and then soldered, the soldering step is omitted, and the terminal The height of the part where the flexible circuit board is connected to can be suppressed,
Further, it is effective in reducing the thickness of the entire recording disk drive device.

[Brief description of drawings]

FIG. 1 is a plan view showing a state in which a lid of a disc chamber is removed.

FIG. 2 is a sectional view taken along line II-II in FIG.

FIG. 3 is a bottom view.

4 is a sectional view taken along line IV-IV in FIG.

5 is a cross-sectional view taken along line V-O-V in FIG.

FIG. 6 is a right side view of a main part.

FIG. 7 is an enlarged plan view of a lifting prevention member.

FIG. 8 is a vertical cross-sectional view of the central portion of FIG.

FIG. 9 is a cross-sectional view of a main part of another hard disk drive device.

FIG. 10 is a plan view of a main part of a stator core.

FIG. 11 is a cross-sectional view of a main part of still another hard disk drive device.

[Explanation of sign]

 10 Base 12 Disc Chamber 14 Annular Recess 22 Rotor Hub 28 Holding Annular Plate 30 Rotor Magnet 34 Stator Core 36 Stator Coil 42 Hard Disk 46 Magnetic Head 58 Second Convex 68 Flexible Circuit Board 68a Drawout 68a1 Tip 70 Connector 72 Terminal 74 Fitting Hole 78 Lifting prevention member 80 Fitting protrusion 84 Terminal area A Spindle motor

Claims (1)

[Claims] 1. A flexible circuit board drawn out from a spindle motor section inside a disk chamber, a floating prevention member at least a part of which is made of an elastic material, and a terminal slightly protruding from a terminal holding section fixed to a base. The flexible circuit board, the flexible circuit board, by the floating prevention member that is fitted to the substrate, at least from the spindle motor portion to the outer peripheral portion of the recording disk, to prevent the floating from the substrate, The recording disk drive device, wherein the floating prevention member elastically holds a portion of the flexible circuit board having a terminal region in a state where the terminal region is in pressure contact with the terminal.