JPH1196659A - Magnetic disk driving device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make a magnetic disk driving device satisfy the fundamental characteristics as a driving device by interposing a resin forming a multilayed structure consisting of a surface part having a high tensile modulus and a central part having a low tensile modulus between a stator and a mounting frame to enhance the rididity of the frame. SOLUTION: A stator unit and a stator holder 11 are respectively joined to the stator holder 11 and a mounting frame 1 with an adhesive to be fixed. A resin forming a multilayered structure is interposed between the stator unit becoming a vibration generating source when a motor is revolved and the mounting frame 1 to perform a vibration absorbing action and the vibration of the motor can be reduced. The resin forming the stator hoder 11 has orientational property in the flow direction at the time of molding and is constituted of a resin molding substance forming the multilayered structure consisting of a surface part 13 having a high tensile modulus in the flow direction and a central part 12 having a low tensile modulus in the flow direction in order to have directivity vertical to the flow direction.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic disk drive for rotating a magnetic disk, and more particularly to a means for blocking or absorbing undesirable vibration or sound during driving (International Patent Classification G11B 33/08). It has features.

[0002]

2. Description of the Related Art A spindle motor of a magnetic disk drive device generates a rotational driving force while repeating attraction and repulsion between a stator portion provided on a mounting frame (fixed portion) and a rotor magnet provided on a rotating portion. Occurs and spins the magnetic disk. Therefore, the stator may vibrate due to the attraction and repulsion between the stator and the rotor magnet, and noise may be generated. As a measure against the noise, for example, as shown in Japanese Patent Application Laid-Open No. 7-148663, a method in which the mounting frame is formed of a resin material and the stator is integrally surrounded with the mounting frame with the resin material is considered. ing.

[0003]

As described above, in the case where noise is reduced by surrounding the stator with a resin material, if the frame is formed of a normal resin material, the rigidity of the frame is insufficient, so that the magnetic disk drive may be used. There was a problem that the basic characteristics could not be satisfied.

[0004]

In order to solve the above-mentioned problems, a magnetic disk drive according to the present invention comprises a surface layer having a high tensile modulus and a central portion having a low tensile modulus between a stator and a mounting frame. It is characterized by interposing a resin having a multi-layered structure. According to this configuration, the frame can be formed of metal, which not only secures sufficient rigidity as a magnetic disk drive device, but also sufficiently absorbs vibration generated by the stator with a resin having a multilayer structure, and reduces the vibration. A noise magnetic disk drive can be provided.

[0005]

BEST MODE FOR CARRYING OUT THE INVENTION

(Embodiment 1) Embodiments of the invention described in claims 1 and 2 of the present invention will be described below with reference to FIGS.
This will be described with reference to FIG.

In FIG. 1, reference numeral 1 denotes a mounting frame made of metal, and a fixed shaft 2 is fixed to the center of the mounting frame.
The free end of the fixed shaft 2 has a magnetic disk 4
Is rotatably supported by a pair of bearings 3. Inside the rotor frame 5, a permanent magnet 6 serving as a cylindrical rotor magnet is fixed via a back plate 7. In the mounting frame 1, an insulating layer formed by resin coating on each of the salient poles of the iron core 8 formed by laminating a plurality of thin plates having a through hole formed in the center and having a plurality of salient poles on the periphery. A stator unit 10 on which a stator coil is wound via 9 is disposed such that each salient pole of the iron core 8 faces the permanent magnet 6 at a predetermined interval,
A motor that drives the magnetic disk 4 to rotate is formed.

The stator unit 10 is fixed to the mounting frame 1 via an annular stator folder 11 formed of a resin having a multilayer structure. That is,
The stator unit 10 is fixed to the stator folder 11 and the stator folder 11 is fixed to the frame 1 by an adhesive. By interposing a resin having a multilayer structure between the stator unit 10 and the mounting frame 1 which is a source of vibration during rotation of the motor, a vibration absorbing function is performed and noise of the motor is reduced.

As shown in FIG. 2, the resin forming the stator folder 11 has orientation in the flow direction at the time of molding and has a tensile modulus of elasticity of 2.5 × 10 ^{10 in the} flow direction.
It has a high surface layer 13 of Pa or more and a direction perpendicular to the flow direction, and therefore has a tensile strength in the flow direction of 2.5 × 10 ¹⁰ Pa or less. Have been. As such a resin, it is preferable to use a resin having completely different characteristics such as a skin layer 13 and a core layer 12 after molding, such as a liquid crystal polymer resin (LCP).

(Embodiment 2) Next, an embodiment of the invention described in claim 3 of the present invention will be described with reference to FIG. Note that the same components as those in the above-described embodiment are denoted by the same reference numerals, and description thereof is omitted.

In FIG. 3, a cylindrical position restricting portion 1a into which the fixed shaft 2 is inserted is provided integrally with an upper surface of the mounting frame 1 for inserting and fixing the fixed shaft 2, and an annular stator folder is provided. 11 is fixed to the mounting frame 1 by inserting and fitting an inner peripheral portion 11a thereof to an outer periphery of the position regulating portion 1a.

According to this configuration, the position of the stator folder 11 with respect to the mounting frame 1 can be easily regulated, and the alignment between the stator unit 10 and the rotor magnet 6 can be easily performed with high precision, thereby reducing the number of assembly steps. I can do it.

(Embodiment 3) Next, an embodiment of the invention described in claim 4 of the present invention will be described with reference to FIG. Note that the same components as those in the above-described embodiment are denoted by the same reference numerals, and description thereof is omitted.

Referring to FIG. 4, a stator folder 11 has a portion 1 vertically protruding annularly around a fixed shaft 2.
1b is provided integrally, and the rotor frame 5 is also provided with a portion 5b opposed to a vertically protruding portion 11b of the stator folder 11 with a predetermined small gap. .

With this configuration, a labyrinth effect can be obtained between the inner peripheral portion 11b of the stator folder and the opposing portion 5b of the rotor frame. In particular, no component for forming a labyrinth seal is required, and the number of components is reduced. In addition, the number of assembly steps can be reduced.

(Embodiment 4) Next, an embodiment of the invention described in claim 5 of the present invention will be described with reference to FIG. The same reference numerals are used for the same components as described above, and the description is omitted.

The feature of FIG. 5 is that the insulating layer portion 9c (the insulating layer 9 in FIG. 1) and the stator folder portion 11c constituting the stator unit 10 are integrally formed of a resin having a multilayer structure. Since the stator folder 11 and the insulating layer 9, which were conventionally required as separate members, are integrated, the number of parts and the number of assembly steps can be reduced.

(Embodiment 5) Next, an embodiment of the invention described in claim 6 of the present invention will be described with reference to FIG. The same reference numerals are used for the same components as described above, and the description is omitted.

Stator folder 11c and insulating layer 9
and c are integrally formed of a resin material having a multilayer structure, as in claim 5, but the feature of FIG. 6 is that the iron core 8 is formed by laminating a plurality of thin plates to be inserted when the molding is performed.
Gap 1 created between layers by pressing up and down
4 is eliminated. With this configuration, the vibration generated between the laminations is stopped and the effect of further reducing the noise of the motor is provided.

[0019]

As described above, according to the magnetic disk drive of the present invention, it is possible to reduce the noise of the motor without impairing the rigidity which is one of the basic characteristics.

[Brief description of the drawings]

FIG. 1 is a sectional view of a magnetic disk drive according to a first embodiment of the present invention;

FIG. 2 is an enlarged sectional view of a main part of the magnetic disk drive.

FIG. 3 is a partial sectional view of a magnetic disk drive according to another embodiment 2 of the present invention;

FIG. 4 is a partial sectional view of a magnetic disk drive according to a third embodiment of the present invention;

FIG. 5 is a partial sectional view of a magnetic disk drive device according to still another embodiment 4 of the present invention.

FIG. 6 is a partial cross-sectional view illustrating a process of manufacturing a magnetic disk drive according to still another embodiment 5 of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Mounting frame 1a Position regulating part 2 Fixed shaft 5 Rotor frame 6 Rotor magnet 8 Iron core 9 Insulating layer 10 Stator unit 11 Stator folder 12 Central part 13 Surface layer

Claims (6)

[Claims] An insulation formed by a resin coating on each of the salient poles of an iron core formed by laminating a plurality of thin plates having a plurality of salient poles formed in the center and having a plurality of salient poles on the periphery. A stator on which a stator coil is wound via a layer is fixed to the mounting frame so that the fixed shaft fixed to the mounting frame is centered, and a free end of the fixed shaft rotatably supports a rotor frame. A cylindrical rotor magnet is fixed inside the rotor frame so as to face the salient pole of the stator at a predetermined interval,
In a magnetic disk drive device in which a motor is formed between the rotor magnet and the stator, the stator is provided on the mounting frame by a resin having a multilayer structure including a surface portion having a high tensile modulus and a central portion having a low tensile modulus. A magnetic disk drive device fixed via a material. 2. The method according to claim 1, wherein the surface layer has orientation in the flow direction at the time of molding and has a tensile modulus of elasticity of 2.5 × 10 ¹⁰ P in the flow direction.
2. The central part is made of a resin having a direction perpendicular to the flow direction and having a tensile elastic modulus of 0.8 × 10 ¹⁰ Pa or less in the flow direction. Magnetic disk drive. 3. A cylindrical position restricting portion into which the fixed shaft is inserted and fixed to a stator mounting frame, wherein the resin material having the multilayer structure is formed in a ring shape. 2. The magnetic disk drive according to claim 1, wherein a circumference of the magnetic disk drive is inserted and fixed in the position restricting portion. 4. A method according to claim 1, wherein the stator is fixed to a mounting frame. An inner peripheral portion of a resin material having a multilayer structure and a portion of the rotor frame protruding opposite to an inner peripheral portion of the resin of the multilayer structure. 4. The magnetic disk drive according to claim 3, wherein a labyrinth effect is obtained. 5. The magnetic disk drive according to claim 1, wherein an insulating layer of the stator unit of the motor and a resin material having a multilayer structure are integrally formed. 6. The method according to claim 1, wherein when the insulating layer of the stator unit of the motor is integrally formed with a resin material having a multilayer structure, a plurality of thin plates constituting an iron core are sandwiched to eliminate a gap between the laminations. The magnetic disk drive according to claim 5, wherein: