JPH08289522A - Spindle motor - Google Patents

Abstract

PURPOSE: To provide a spindle motor, wherein the magnetic characteristic in not decreased, by providing the constitution, wherein the copper wire part of a stator coil pushes the coil cutting part of a flexible substrate along the coil hole of a stator substrate. CONSTITUTION: A flexible substrate 14 is provided on a conductive stator substrate 13 having rigidity. A plurality of position detecting elements 15 are arranged on a a cutting part 24 for crossed elements. Element holes 26 are provided at the position, where the position detecting elements 15 are placed, in the stator substrate 13. A part of a triangle-shaped flake of the element cutting part 24 is bent to the side of the stator substrate 13 when the molded part of the position detecting element 15 is mounted in the inserting pattern into the element hole 26 of the stator substrate 13. Therefore, the position detecting element can be attached to the conductive stator substrate having the excellent strength so that the molded part faces downward. As a result, the spindle motor, wherein the magnetic characteristic is not decreased, can be obtained with the features such as the compact configuration, the thin shape and the low dissipation power being maintained.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a spindle motor for driving a disk of an audio visual device or a computer memory device, which mainly uses a digital disk in the field of OA / AV.

[0002]

2. Description of the Related Art In recent years, miniaturization and high density of audio visual devices and computer memory devices have been rapidly progressing.
Among these technological innovations, particularly miniaturization, thinning, and low power consumption are required for spindle motors that rotate and drive disks.

As miniaturization and thinning progress, as a matter of course, the space for the drive magnet and the stator coil, which determine the magnetic characteristics, is limited and the characteristics deteriorate.

A conventional spindle motor will be described below. FIG. 8 is a structural sectional view of a conventional spindle motor. In FIG. 8, 1 is a magneto-optical disk medium (hereinafter referred to as a disk), 2 is the disk 1
The mounting plate 3 made of a ferromagnetic material provided on the disk is a spindle hub for receiving the disk 1.

A rotary shaft 16 is attached to the center of the spindle hub 3 and rotates together with the spindle hub 3 and the disk 1 to form the center of rotation. The rotating shaft 16 is supported by the open type ball bearing 33 and the metal 11.

The rotational driving force of the motor is a rotating magnetic field produced by a stator core 8 which is wound around a stator coil 9 and excited by electric power supply, and a multi-pole magnetized driving magnet 5 surrounding the rotating magnetic field.
It is caused by and. The drive magnet 5 is a frame 3
The frame 31 is fixed to the inner circumference of the spindle 1. The frame 31 is also fixed to the spindle hub 3 to form a rotor for rotating the disk 1. A clamp magnet 32 is mounted on the frame 31, and the clamp magnet 32 has a role of fixing the disk 1 to the spindle hub 3 by a magnetic attraction force. Further, the stator core 8 is fixed to a housing 12, and the stator coil 9 is wired to a flexible substrate 30 attached to an electrically conductive stator substrate 29 to serve as a driving force generation source.

[0007]

However, in the above-mentioned conventional structure, each component such as a clamp magnet for attracting a disk must be made thinner as the motor becomes thinner. For example, reducing the thickness of the clamp magnet has a problem in that the attraction force is reduced and the clamp magnet is easily broken, which increases the difficulty in manufacturing conditions.

The thickness of the stator core and the number of windings of the copper wire of the stator coil, which determine the magnetic performance of the motor, are also greatly affected by the reduction in thickness, which causes deterioration of the motor starting time and the motor current value.

Further, the grease of the open type ball bearing may be mixed with the leaking metal, and conversely, the oil of the metal may be mixed with the open type ball bearing. If mixed, there is a problem that the performance of each bearing deteriorates and the motor performance is impaired in a short time.

Further, there is a problem that when the rotating body portion such as the rotating shaft removes the disc from the fixed body portion such as the bearing, it comes out together with the clamp magnet that attracts the disc.

The present invention provides means for solving the above problems while maintaining the features such as small size, thin shape, and low power consumption, and realizes the various industrial demands mentioned at the beginning.

[0012]

To achieve this object, a spindle motor according to the present invention comprises a rotary shaft, a frame, a spindle hub which is a disc mounting portion, and a clamp magnet, and the frame has a disc. Is provided with a plurality of holes in the portion facing the, and the clamp magnet is provided in the holes, and a rotary shaft and a single-shield type ball bearing for supporting the rotary shaft, and the rotary shaft being radial. Direction supporting metal, the one-sided shield type ball bearing and a housing for fixing the metal, the one-sided shield type ball bearing is characterized in that a shield plate is provided on the metal side, and a rotating shaft A ball bearing that supports the rotating shaft; a metal that supports the rotating shaft in a radial direction; and a ball bearing. A ring and a housing for fixing the metal, wherein the grease of the ball bearing and the oil of the metal are components that do not deteriorate each other when mixed, and the rotary shaft and the rotary shaft A ball bearing that supports, a metal that radially supports the rotating shaft, and a housing that fixes the ball bearing and the metal.
The rotating shaft and the ball bearing are fixed, and further, the ball bearing and the housing are fixed, and an electrically conductive stator substrate, a flexible substrate provided on the stator substrate, and a position detecting element. And a hole for an element is provided on the stator substrate on which the position detecting element is placed, and a notch for an element is provided on the flexible substrate on which the position detecting element is placed, The molded portion of the position detecting element is configured to press the element cut portion of the flexible substrate along the element hole of the stator substrate, and the conductive stator substrate and the stator. It consists of a flexible board provided on a board and a stator coil. A coil hole is provided on the stator substrate, a coil notch is provided on the flexible substrate on which the stator coil is placed, and a copper wire portion of the stator coil is provided on the flexible substrate. And a means characterized in that the coil cut portion is configured to be pushed along the coil hole of the stator substrate.

[0013]

With this structure, it is possible to realize a spindle motor which does not deteriorate the magnetic characteristics of the motor while maintaining characteristics such as small size, thinness, and low power consumption.

[0014]

An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a sectional view of a spindle motor according to an embodiment of the present invention. 2 is a top view of an embodiment of the present invention, FIG. 3 is a detailed view of an embodiment of claim 2 of the present invention, FIG. 4 is a detailed view of an embodiment of claim 3 of the present invention,
5 is a detailed view of claim 4 of the present invention, FIG. 6 is a detailed view of claim 5 of the present invention, and FIG. 7 is a detailed view of claim 6 of the present invention.

Since each of FIGS. 2, 3, 4, 5, 5, 6 and 7 is an independent invention, parts which are not directly related to the invention are shown in the conventional configuration.

In FIG. 1, 1 is a medium of a magneto-optical disk (hereinafter referred to as a disk), 2 is a mounting plate made of a ferromagnetic material provided on the disk 1, and 3 is a spindle hub for receiving the disk 1. is there.

A rotary shaft 7 is attached to the center of the spindle hub 3 and rotates together with the spindle hub 3 and the disk 1 to form the center of rotation. The rotating shaft 7 is supported by a one-shield type ball bearing 10 and a metal 11. The one-shield type ball bearing 10 is assembled such that a shield plate is provided on the side facing the metal 11 (generally, the ball bearing has the same thickness dimension as the open type and the one-shield type. Is about 1mm thicker than those.) Since the shield plate is between the ball bearing and the metal, it is possible to prevent grease and oil from mixing with each other.

In FIG. 4, 18 is a ball bearing grease, 19 is a metal oil, and 20 is a ball bearing. The base oil of the grease 18 and the base oil of the oil 19 are composed of the same component or components which are unlikely to cause a chemical reaction with each other. Therefore, even if the base oil is vaporized when the motor is exposed to a high temperature environment, it is possible to maintain stable lubrication of the bearing without causing abnormal components.

In FIG. 5, 21 is a rotary shaft groove for an adhesive provided on the rotary shaft 7, and 22 is a housing groove for an adhesive provided on the housing 12. Ball bearing 1
The rotary shaft groove 21 and the housing groove 22 are bonded and fixed by an adhesive 23. With this,
This prevents the rotating body from coming off when removing the disc from the motor. Of course, although the method of bonding has been described in the embodiment, it is needless to say that the same effect can be obtained even when the ball bearing is fixed by a method such as warm fitting or press fitting.

In FIGS. 1 and 6, a flexible substrate 14 is provided on a conductive stator substrate 13 having rigidity. A plurality of position detecting elements 15 are arranged on the crossed element notches 24 on the flexible substrate 14. Further, the stator substrate 13 has an element hole 26 at a position where the position detecting element 15 is placed.

When a part of the triangular-shaped flexible portion of the element notch 24 is placed in such a manner that the molded portion of the position detecting element 15 is inserted into the element hole 26 of the stator substrate 13, the stator substrate 13 side Bend to. Since the stator substrate 13 is electrically conductive, if the element notch 24 is not provided, the position detecting element 15 causes a short circuit between pins. Therefore, conventionally, in the motor using the conductive stator substrate, the mold portion of the position detecting element can be attached only upward. Since the position detecting element can be attached to the conductive stator substrate, which is excellent in strength, with the mold portion facing downward, the motor can be made thin without degrading the performance of the motor.

The rotational driving force of the motor is a rotating magnetic field produced by a stator core 8 which is wound around a stator coil 9 and excited by power supply, and a multi-pole magnetized driving magnet 5 surrounding the rotating magnetic field.
It is caused by and. The drive magnet 5 is a frame 4
The frame 4 is fixed to the inner circumference of the spindle hub 3 and is fixed to the spindle hub 3 to form a rotor for rotating the disk 1.

In FIGS. 1 and 2, a plurality of holes are provided on the frame 4, and a clamp magnet 6 corresponding to the thickness of the frame 4 is embedded by a method such as molding. The clamp magnet 6 has a role of fixing the disk 1 to the spindle hub 3 by a magnetic attraction force.

By embedding the clamp magnet 6 in the frame 4, the thickness dimension of the clamp magnet 6 is included in the frame 4, and the height dimension of the motor can be reduced without any change in performance.

The stator core 8 is the housing 1
2 is fixed to the stator coil 9 and the stator coil 9 is attached to an electrically conductive stator substrate 13.
It is wired to 4 and serves as a driving force generation source.

In FIGS. 1 and 7, there are crossed coil notches 28 on the flexible substrate 13 at positions where a plurality of stator coils 9 are arranged, and coil holes 27 are provided on the stator substrate 14. . A part of the triangular-shaped flex of the coil notch portion 28 causes the copper wire portion of the stator coil 9 to move into the coil hole 27 of the stator substrate 13.
When it is mounted in a manner such that it is inserted into, it is bent toward the stator substrate 13 side. Since the stator substrate 13 is conductive, if the coil notch 28 is not provided, the stator coil 9 will be short-circuited. Therefore, conventionally, in a motor using a conductive stator substrate, the stator coil could not be mounted so as to float above the stator substrate. However, according to the present embodiment, it is possible to reduce the thickness of the motor without lowering its performance.

[0028]

INDUSTRIAL APPLICABILITY As described above, the present invention provides an excellent spindle motor that meets the needs of the industry at a low cost while maintaining the characteristics of small size, thinness, low power consumption, etc. without deteriorating the magnetic characteristics of the motor. Is what you can do.

[Brief description of drawings]

FIG. 1 is a structural sectional view of a spindle motor according to an embodiment of the present invention.

FIG. 2 is a top view of a spindle motor according to an embodiment of the present invention.

FIG. 3 is a detailed view of the vicinity of a rotary shaft of a spindle motor according to the present invention.

FIG. 4 is a detailed view of the vicinity of the rotary shaft of the spindle motor according to the present invention.

FIG. 5 is a detailed view of the vicinity of the rotary shaft of the spindle motor according to the present invention.

FIG. 6 is a detailed view of a flexible substrate of a spindle motor according to the present invention.

FIG. 7 is a detailed view of a flexible substrate of the spindle motor according to the present invention.

FIG. 8 is a structural cross-sectional view of a conventional spindle motor.

[Explanation of symbols]

 1 Disc 2 Mounting Plate 3 Spindle Hub 4, 31 Frame 5 Drive Magnet 6,32 Clamp Magnet 7,16 Rotating Shaft 8 Stator Core 9 Stator Coil 10 Single Shield Type Ball Bearing 11 Metal 12 Housing 13, 29 Stator Board 14,30 Flexible Board 15 Position Detecting Element 17, 20 Ball Bearing 18 Grease 19 Oil 21 Rotating Shaft Groove 22 Housing Groove 23 Adhesive 24 Element Cutout 26 Element Hole 27 Coil Hole 28 Coil Cutout 33 Open Ball Bearing

Claims (6)

[Claims] 1. A rotary shaft, a frame, a spindle hub that is a disk mounting portion, and a clamp magnet,
A spindle motor having a plurality of holes in a portion of the frame facing the disc, and the clamp magnet being provided in the holes. 2. A rotary shaft, a one-shield ball bearing that supports the rotary shaft, a metal that radially supports the rotary shaft, and a housing that fixes the one-shield ball bearing and the metal. The spindle motor, wherein the one-sided shield ball bearing is configured such that a shield plate is provided on the metal side. 3. A grease for the ball bearing, which comprises a rotating shaft, a ball bearing supporting the rotating shaft, a metal supporting the rotating shaft in a radial direction, and a housing fixing the ball bearing and the metal. A spindle motor characterized in that the metal oil and the metal oil are components that do not deteriorate each other when mixed. 4. A rotary shaft, a ball bearing that supports the rotary shaft, a metal that supports the rotary shaft in a radial direction, and a housing that fixes the ball bearing and the metal. A spindle motor in which a ball bearing is fixed, and further, the ball bearing and the housing are fixed. 5. An electrically conductive stator substrate, a flexible substrate provided on the stator substrate, and a position detecting element. An element hole is provided on the stator substrate on which the position detecting element is placed. And a cut portion for an element is provided on the flexible substrate on which the position detection element is placed, and a mold portion of the position detection element is a cut portion for the element of the flexible substrate for the element of the stator substrate. A spindle motor characterized by being pushed along a hole. 6. An electrically conductive stator substrate, a flexible substrate provided on the stator substrate, and a stator coil, wherein a coil hole is provided on the stator substrate on which the stator coil is placed, A coil notch is provided on the flexible substrate on which the stator coil is placed, and a copper wire portion of the stator coil is formed along the coil notch of the flexible substrate along the coil hole of the stator substrate. A spindle motor characterized by being configured to be pushed in by pushing.