JPH076989U - Disk drive device - Google Patents

Abstract

(57) [Abstract] [PROBLEMS] To provide a structure capable of mounting a core on a circuit board and at the same time mounting a stator on a device base even when the circuit board is smaller than a plane area of a rotor. [Structure] The circuit board and the core are fixed to each other in the bearing periphery to form a spindle motor unit, and the spindle motor unit and the device base are also integrally fixed to each other in the bearing periphery to fix the circuit board to the core and the device base. It is sandwiched between and. [Effect] The bearings of the device base and the spindle motor unit can be accurately positioned in the vertical direction. Therefore, the upper surface of the hub formed integrally with the rotor and surrounding the spindle is parallel to the apparatus base. As a result, the moving surface of the magnetic head and the recording medium become parallel.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a disk drive device having a structure in which a spindle motor unit that supports and rotates a recording medium is fixed to a device base using a fastener.

[0002]

[Prior art]

 FIG. 4 shows a conventional example of a magnetic disk device to which the spindle motor according to the invention is applied. As shown in the figure, a spindle motor 1 for rotating a magnetic disk of a recording medium, which is a rotation mechanism device for a magnetic disk, is mounted on a circuit board 3 made of a metal substrate on the surface of which a conductive circuit is formed via an insulating layer. It is attached. For example, the spindle motor unit 4 is formed by attaching the circuit board 3 to the core that constitutes the motor. After that, the circuit board 3 is fixed to the mounting portion 21 of the device base 2 with the screw 5 from the mounting hole 36 at a predetermined position. When the apparatus is used, it is determined by rotating the spindle motor 1 and moving the magnetic head for recording / reproducing to an information track in a desired radial direction of the recording medium by a drive motor (not shown). The recorded information is recorded and reproduced via the magnetic head.

In general, since the circuit board 3 is larger than the rotor 11 constituting the spindle motor 1, even if the spindle motor 1 is once attached to the circuit board 3, the side portion of the circuit board 3 has a sufficient mounting hole. Since there is a space to be bored, the hole 36 is bored there, the screw 5 is inserted therethrough, and the device base 2 is mounted.

However, since the control circuit of the spindle motor does not include the frequency generator (FG) and circuit components are miniaturized, the magnetic disk device is also required to be miniaturized. Therefore, the surface area of the circuit board 3 is reduced. May be smaller than the plane area of the rotor, and even if the spindle motor 1 is mounted on the circuit board 3, the circuit board 3 may be hidden by the rotor 11 and there is no space for forming a mounting hole on its side. is there. In this case, the above mounting method cannot be adopted.

If the circuit board 3 is larger than the rotor, the spindle motor 1 and the circuit board 3 are joined to form the spindle motor unit 4, which is then mounted on the device base 2. Warpage and bending are likely to occur, which affects the upper surface 18 of the hub of the spindle motor and deteriorates the parallelism with the recording medium, and also deteriorates the accuracy of the mounting height to improve the accuracy of mounting between the magnetic heads. Make it worse.

[0006]

[Problems to be solved by the device]

 In view of the above situation, the present invention provides a mounting structure that allows the motor to be mounted on the circuit board 3 without any problem even when the circuit board 3 becomes smaller than the rotor, and at the same time the spindle motor unit 4 can be mounted on the device base 2. It is the one we are trying to provide.

At the same time, the circuit board 3 is less likely to be affected by warping or bending, the mounting surface of the device base 2 and the upper surface of the hub are parallel to each other, and the mounting height is accurate. As a result, the parallelism with the recording medium is improved, and an attempt is also made to provide a mounting structure that improves the accuracy of the mounting position with respect to the magnetic head.

[0008]

[Means for Solving the Problems]

 According to the present invention, a spindle motor unit including a spindle motor including a core and a rotor that supports and rotates a recording medium, and a circuit board that constitutes a control circuit for the spindle motor is held on a mounting base by fasteners. In the disk drive device according to the present invention, the gist is that the circuit board is interposed between the core and the mounting base so as to be integrally clamped and held by the fastener.

[0009]

[Action]

 The circuit board and the core are fixed to each other around the bearing to form the spindle motor unit, and the spindle motor unit and the device base are also integrally fixed around the bearing, so that the circuit board is connected to the device base and the core. It will be sandwiched between them.

As a result, the bearings of the device base and the spindle motor unit can be accurately positioned vertically. Therefore, the upper surface of the hub formed integrally with the rotor and surrounding the spindle is parallel to the base of the apparatus. As a result, when the recording medium is placed on the upper surface of the hub and the magnetic head moves to an information track in a desired radial direction of the recording medium from another place of the device base via a moving mechanism (not shown), The moving surface and the recording medium are parallel.

[0011]

【Example】

 The same reference numerals are attached to those having the same function as the conventional example.

FIGS. 1, a, b and c show an embodiment in which the present invention is applied to a small magnetic disk drive device. As shown in FIGS. A and b, the circuit board 3 is also downsized with the downsizing of the device, and the position on the circuit board where the core winding set 12 is attached is the side surface 37 of the circuit board. When the substrate 3 and the core winding set 12 are assembled to form a stator, a part of the bottom surface of the core winding set 12 protrudes from the circuit board 3. In the figure, at least one hole 19 bored in the core is screwed and fixed to the stop hole 35 of the side surface using a screw 51. However, the core winding set and the circuit board are connected by an adhesive or the like. You may fix.

The bearing 14 is inserted and fixed in the shaft hole 16 bored in the central portion of the core, and a circuit board on which a circuit component 34 for driving a motor is separately mounted is combined to form the stator 10.

As shown in FIG. C, the stator 10 is fixed to the mounting portion 21 drilled on the apparatus base 2 by using at least one screw 52, and then the stator 10 is arranged at the center of the spindle 11. By inserting 15 into the bearing 14, the drive device of the magnetic disk drive device and the spindle motor unit 4 are completed.

FIG. 2 shows another embodiment. In the figure, a hole 19 for fixing a screw on the circuit board 3 for fixing the core winding set 12 and a hole for fixing the stator 10 on the device base 2 are also used. There is a mounting portion 21 on the projection surface of the hole 19 onto the apparatus base 2, and the mounting portion 21 penetrates the substrate and is screwed together with a screw 53.

FIG. 3 is a diagram showing a relationship between the apparatus base 2 and the hub upper surface 18 of the rotor 11 in the embodiment. The circuit board 3 formed by forming a circuit made of the conductive member 32 on the substrate 33 made of metal or the like via the insulating member 31 and the core 13 are fixed at the peripheral portion 17 of the shaft hole via the spacer 60 made of resin or the like. Since the stator is formed and the device base 2 is also integrally connected at the peripheral portion 17 of the shaft hole, the circuit board 3 is sandwiched between the device base 2 and the core 13. The spacer may be omitted.

As a result, the bearings of the device base 2 and the spindle motor unit 4 can be accurately positioned in the vertical direction. Therefore, the hub upper surface 18 which is formed integrally with the rotor 11 and surrounds the spindle 15 is parallel to the apparatus base 2. When the recording medium is placed on the upper surface 18 of the hub and the magnetic head is moved to an information track in a desired radial direction of the recording medium from another place of the apparatus base through a moving mechanism (not shown), the magnetic head is moved. The recording medium placed on the drive moving surface and the hub upper surface are parallel to each other.

The circuit board 3 can serve as a stator by fixing the main members constituting the spindle motor such as the core winding set 12. Various materials can be used as long as they have good flatness and do not cause distortion. After forming a circuit by punching out a conductive member 32 such as iron, one coated with an insulating member 31 such as a resin or one in which a copper foil is attached to a resin plate is etched to form a circuit, Various members such as a multilayer substrate can be used. Therefore, other than the above-described embodiments, various modifications can be made without departing from the scope of the present invention.

[0019]

[Effect of device]

 Even if the circuit board becomes smaller and a part of the bottom surface of the core winding set protrudes from the circuit board, not only can the core winding set and the circuit board be easily fixed with a small number of members, but also the device It can be securely attached to the base. As a result, the manufacturing cost is reduced.

The bearings of the device base and the spindle motor unit can be positioned exactly vertically. Therefore, the upper surface of the hub, which is formed integrally with the rotor and surrounds the spindle, is parallel to the mounting base, so that the recording medium is mounted on the upper surface of the hub, and the moving mechanism can be moved from another location of the device base. When the magnetic head moves to an information track in a desired radial direction of the recording medium via the magnetic head, the moving surface of the magnetic head and the recording medium mounted on the upper surface of the hub are surely parallel to each other.

[Submission date] September 2, 1994

[Procedure Amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0008

[Correction method] Change

[Correction content]

[0008]

[Means for Solving the Problems]

According to the present invention , a spindle motor unit including a spindle motor having a rotor supporting a recording medium and rotating and a core, and a circuit board constituting a control circuit of the spindle motor is fastened to an apparatus base. In the disk drive device held by a tool, the gist is that the core and the device base are sandwiched and held integrally by the fastener by interposing the circuit board.

[Procedure 3]

[Document name to be amended] Statement

[Correction target item name] 0013

[Correction method] Change

[Correction content]

The bearing 14 is inserted and fixed in the shaft hole 16 formed in the center of the core, and the circuit board 3 on which the circuit component 34 for driving the motor is separately mounted is combined to form the stator 10. The circuit board 3 may for various things used as long as the flatness is not good cause distortion. Accordingly, various modifications of Ru available Der within a range not Iddan the framework of the present invention.

[Procedure amendment 4]

[Document name to be amended] Statement

[Correction target item name] 0016

[Correction method] Change

[Correction content]

FIG. 3 is a diagram showing a relationship between the apparatus base 2 and the hub upper surface 18 of the rotor 11 in the embodiment. Circuit board 3 and the core 13 forming a circuit comprising the conductive member 32 through an insulating member 31 on the substrate 33 such as a metal is fixed in the axial hole periphery 17 to form a stator through a spacer 60 made of resin or the like Furthermore, since the device base 2 is also integrally connected at the shaft hole peripheral portion 17, the circuit board 3 is sandwiched between the device base 2 and the core 13. The spacer may be omitted.

[Procedure Amendment 5]

[Document name to be amended] Statement

[Correction target item name] 0017

[Correction method] Added

[Correction content]

As a result, the circuit board 3 is closely fixed to the device base 2 , so that the bearings of the device base 2 and the spindle motor unit 4 can be accurately positioned in the vertical direction. Therefore, the hub upper surface 18 which is formed integrally with the rotor 11 and surrounds the spindle 15 is parallel to the apparatus base 2. When the recording medium is placed on the hub upper surface 18 and the magnetic head is moved to an information track in a desired radial direction of the recording medium from another place of the mounting base via a moving mechanism (not shown), the moving surface of the magnetic head is moved. And the recording medium placed on the upper surface of the hub becomes parallel.

[Procedure correction 6]

[Document name to be amended] Statement

[Correction target item name] 0018

[Correction method] Change

[Correction content]

The circuit board 3 can serve as a stator by fixing the main members constituting the spindle motor such as the core winding set 12. Various types can be used even if they have poor flatness and are prone to distortion . After forming the circuit by punching a conductive member 32 such as iron, of which copper foil to one or a resin plate coated with insulation member 31 such as a resin to form a circuit by etching what is stuck In addition, various members such as a multilayer substrate can be used. Therefore, other than the embodiments described above, various modifications can be made without departing from the scope of the present invention.

[Brief description of drawings]

FIG. 1 is an embodiment of the present invention.

FIG. 2 is another embodiment of the present invention.

FIG. 3 is a diagram showing a relationship between a device base according to the present invention and an upper surface of a hub of a rotor.

FIG. 4 is a conventional example of a magnetic disk device according to the invention.

[Explanation of symbols]

 1 spindle motor 2 device base 3 circuit board 4 spindle motor unit 6 bearing direction surface 10 stator 11 rotor 12 core winding set 13 core 14 bearing 15 spindle 16 shaft hole 17 shaft hole peripheral part 18 hub upper surface 19 core hole 21 mounting Part 22 Hole to be tightened together 31 Insulation member 32 Conductive member 34 Circuit component 35 Fastening hole 36 Mounting hole 37 Side edge surface of circuit board 51 Screw 52 Screw.

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[Procedure amendment]

[Submission date] September 2, 1994

[Procedure Amendment 1]

[Document name to be amended] Statement

[Name of item to be amended] Scope of utility model registration request

[Correction method] Change

[Correction content]

[Scope of utility model registration request]

Claims (1)

[Scope of utility model registration request] 1. A roller that supports and rotates a core and a recording medium.
In a disk drive device in which a spindle motor unit consisting of a spindle motor composed of a controller and a circuit board constituting the control circuit thereof is held by a fastener on a device base, the circuit is provided between the core and the device base. A disk drive device, characterized in that it is integrally clamped and held by the above-mentioned fastener by interposing a substrate.