JP2502795Y2 - Disk unit - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disk device, and more particularly to a disk device having a spindle motor provided on a metal substrate in order to improve characteristics against external noise.

[0002]

2. Description of the Related Art FIG. 8 is a sectional view showing an example of a spindle motor portion of a conventional disk device.

Generally, in a disk device, in order to shield various electrical noises such as line noises, induction noises, electrostatic noises from the outside, the disk, head and the like are covered with a metal plate as much as possible. I am trying.
Therefore, in the disk device 1 shown in FIG. 8, the metal frame (hereinafter, simply referred to as a frame) 2 that is the main body of the disk device 1 acts as a main member that shields the noise.

Further, in recent years, the spindle motor 3 is mounted on a substrate 4 mainly composed of an iron plate having a function of a shielding plate also in the portion of the opening 2c of the frame 2 which is an opening for disposing the spindle motor 3. The board 4 and the frame 2 are electrically connected to each other to further improve the shielding effect.

In FIG. 8, the upper surface 2a of the frame 2 near the spindle motor 3 has an upper surface 6a of the rotor 6 for mounting a disk cartridge (not shown).
And are located at substantially the same height. For this reason frame 2
A leg portion 2b for attaching the above-mentioned substrate 4 is hung vertically downward, and the substrate 4 is attached to the tip end surface 2c of this leg portion 2b by an attaching screw 7.

FIG. 9 shows an enlarged cross-sectional view of a joint portion between the frame 2 and the substrate 4.

As shown in FIG. 1, the substrate 4 is a conductor in which an insulating layer 4b made of polyimide resin or the like is formed on the surface of an iron plate 4a, and a copper foil as a conductor and a resist as an insulator are arranged on the insulating layer 4b. This is a configuration in which the layer 4c is formed.

In the conventional disk device 1, the tip surface 2c of the leg portion 2b is formed on the conductor layer 4c of the substrate 4.
The substrate 4 is fixed to the frame 2 by directly contacting the upper surface and screwing the mounting screw 7 into the screw hole 2d of the leg 2b through the screw insertion hole 4d formed in the substrate 4.

[0009]

In the disk device 1 having the above structure, the frame 2 which acts as a noise shielding plate.
And the electric connection with the iron plate 4a of the substrate 4 are made only through the mounting screws 7 as shown in FIG.
Only the head portion 7a of the mounting screw 7 and the screw portion 7b exist as the contact portion. Therefore, the frame 2 and the iron plate 4
There is a shortage of electrical continuity with a, and as a result, there has been a problem that the noise shielding effect in the portion of the substrate 4 cannot be expected so much.

Therefore, the present invention has been made in view of the above problems, and it is an object of the present invention to provide a disk device having a good characteristic against external noise by giving a sufficient shielding effect also to the substrate where the spindle motor is provided. To aim.

[0011]

In order to achieve the above-mentioned object, the present invention provides a substrate on which a metal plate is provided with an insulating layer and a conductor wiring pattern, and a spindle motor for rotating a disk is provided on the upper surface of the substrate. In the disk device mounted on, the metal frame is in contact with the metal plate exposed portion of the substrate where the insulating layer and the conductor wiring pattern are removed and the metal plate is exposed.

[0012]

With the configuration in which the substrate is mounted with the metal frame in contact with the exposed portion of the metal plate of the substrate, the contact area for electrically connecting the metal plate of the substrate and the metal frame is increased, and the spindle motor is provided. Similar to the metal frame, it also has a noise blocking effect on the board portion.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENT FIG. 3 shows a plan view of a substrate provided with a spindle motor.

In the figure, a substrate 10 has an insulating layer made of a polyimide resin or the like formed on the surface of an iron plate, as in the case of the conventional substrate 4 described with reference to FIG. In the substrate body 11 having a structure in which a conductor layer having a resist pattern is formed, various electronic components 12 electrically connected to the conductor wiring on the surface of the substrate body 11, and as shown in FIG. 11, a stator is incorporated, and a spindle motor 13 in which a rotor is rotatably provided is provided in the stator.

Further, there are three units around the spindle motor 13.
Attachment portions 14 for attaching the substrate 10 to a metal frame (hereinafter, simply referred to as a frame), which will be described later, are provided at a total of five places, that is, two places at both ends of the substrate body 11.

FIG. 4 is a plan view of a frame which is the disk device body.

In the figure, a frame 20 is a member integrally formed of a casting by aluminum die casting, and has a motor fitting opening 21 in which the spindle motor 13 on the substrate 10 is fitted and arranged, and Similarly, component openings 22 for exposing the electronic components 12 on the substrate 10 are respectively formed, and a plurality of various component mounting bases 23 on which a head, a head driving device (not shown) and the like are provided are formed.

Further, around the motor fitting opening 21 and both ends of the frame 20, at the same plane position as the five mounting portions 14 of the substrate 10, the leg portion 2b in FIG.
As shown by the dotted line in FIG. 4, the leg portion 24 having the same shape as the above is vertically extended downward from the lower surface of the frame 20.

In the board 10, the spindle motor 13 is aligned with the motor fitting opening 22, and the mounting portions 14 of the board 10 are aligned with the legs 24 of the frame 20. It is attached to the frame 20 from the back side. 5 and 6 are a plan view and a rear view of the disk device with the substrate 10 attached to the frame 20, respectively. As shown in FIG. 6, the substrate 10 has a mounting screw 3
1 from the back surface 11d of the substrate body 11 to the frame 20
Fixed to.

Here, FIG. 1 shows an enlarged cross-sectional view of a joint portion between the leg portion 24 of the frame 20 and the mounting portion 14 of the substrate 1.

As described above, in the substrate body 11, an insulating layer 11b is formed on the surface of an iron plate 11a having a noise shielding effect, and a conductor in which a copper foil as a conductor and a resist as an insulator are pattern-disposed on the insulating layer 11b. This is a configuration in which the layer 11c is formed. Then, in the disk device 30 of this embodiment,
The front end surface 24a of the leg portion 24 of the frame 20 is the substrate body 1
It is configured to be in direct contact with the surface of the first iron plate 11a.

FIG. 2 shows the frame 20 and the substrate 10 shown in FIG.
The disassembled sectional view of the junction part with is shown.

As shown in the figure, in the mounting portion 14 of the substrate body 11, the exposed portion of the iron plate having a structure in which the insulating layer 11b and the conductor layer 11c are removed so as to correspond to the shape of the tip end surface 24a of the leg portion 24. 15 is formed in advance. The method of forming the exposed portion 15 of the iron plate is such that the insulating layer 11b is formed on the surface of the iron plate 11a,
There is also a method in which the conductor layer 11c and the conductor layer 11c are formed in a flat shape (the exposed portion 15 of the iron plate is not formed) in advance, and then the portion where the leg portions 24 abut is removed by etching or mechanical means. In addition, the insulating layer 11b and the conductor layer 11 are formed on the iron plate 11a.
In the process of forming c, the insulating layer 11b and the conductor layer 1
After performing a treatment (for example, forming a resist pattern) such that 1c is not formed, the insulating layer 11b and the conductor layer 11 are formed.
There is also a method of forming the iron plate exposed portion 15 by forming c. Alternatively, it may be formed by another method.

Further, as shown in FIG. 2, a back face 11d of the substrate body 11 is provided with a spot facing portion 11f for the head 31a of the screw 31.

Then, as shown in FIG. 1, 2 or 6,
The substrate 10 is fixed to the frame 20 by inserting the mounting screw 31 from the rear surface 11d side of the substrate body 11 into the screw insertion hole 11e and screwing the screw 31 into the screw hole 24b of the leg portion 24.

As shown in FIG. 1, the tip surface 24 of the leg portion 24
Since a directly contacts the surface of the iron plate 11a, electrical conduction is achieved even in the portion where the tip surface 24a is in contact with the iron plate 11a. That is, the contact area for electrical conduction between the iron plate 11a and the frame 20 is increased as compared with the conventional case where electrical conduction between the frame and the substrate is performed only through the mounting screw 7. Moreover, since the iron plate 11a and the frame 20 are in direct contact with each other without passing through the mounting screws as in the conventional case, the electrical conductivity is remarkably improved as compared with the conventional case.

Therefore, according to the disk device 30 of the present embodiment, the electrical conduction between the substrate 10 and the frame 20 is good as described above, and the substrate 10 provided with the spindle motor 13 is as sufficient as the frame 20. It comes to have a function of shielding external noise. As a result, the characteristics of the disk device 30 with respect to external noise are improved as compared with the conventional one.

Further, since the shield measure for enhancing the shielding effect, which is used in the conventional disk device, is not required, the number of parts for the shield measure is reduced accordingly, and the cost of the disk device is expected to be reduced by this. it can.

In the above embodiment, FIGS. 3 to 6 are used.
As shown in FIG.
Attached by, about the total of 5 parts, legs 2
However, the present invention is not limited to this, and the present invention is not limited to this.
As shown in FIG. 7, the leg portion 2 for the purpose of only electrically connecting the frame 20 and the iron plate 11a of the substrate body 11 to each other.
6 is newly provided in addition to the leg portion 24, and an iron plate exposed portion 16 similar to the iron plate exposed portion 15 is newly provided in the substrate body 11 so that the entire front end surface 26a of the leg portion 26 directly contacts the iron plate 11a. It may be configured. This makes frame 2
0 and the electric conduction between the iron plate 11a are further improved, and the characteristics of the substrate 10 portion having the spindle motor 13 against external noise are further improved.

[0030]

As described above, according to the present invention, the contact area for electrically conducting the metal plate of the substrate and the metal frame is increased, so that the substrate in the portion where the spindle motor is provided has a sufficient shielding effect. The disk device has
It is possible to improve the characteristics against external noise such as line noise, induction noise, and electrostatic noise.

[Brief description of drawings]

FIG. 1 is an enlarged sectional view of an embodiment of a joint portion between a frame and a substrate in a disk device according to the present invention.

2 is an exploded cross-sectional view of a joint portion between a frame and a substrate shown in FIG.

FIG. 3 is a plan view of a substrate provided with a spindle motor.

FIG. 4 is a plan view of a metal frame.

FIG. 5 is a plan view of the disk device with the substrate attached to the frame.

FIG. 6 is a rear view of the disk device in which the substrate is attached to the frame.

FIG. 7 is an enlarged cross-sectional view of a modified example of the joint portion between the frame and the substrate in the disk device of the present invention.

FIG. 8 is a cross-sectional view of an example of a spindle motor portion of a disk device.

FIG. 9 is an enlarged cross-sectional view of an example of a joint portion between a frame and a substrate in a conventional disk device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 board 11 board main body 11a iron plate 11b insulating layer 11c conductor layer 11d back surface 11e screw insertion hole 12 electronic component 13 spindle motor 14 mounting portion 15, 16 iron plate exposed portion 20 metal frame 21 motor fitting opening 24, 26 Legs 24a, 26a Tip surface 24b Screw hole 30 Disk device 31 Mounting screw

Claims (1)

(57) [Scope of utility model registration request] 1. A disk device in which an insulating layer and a conductor wiring pattern are formed on a metal plate, and a substrate having a spindle motor for disk rotation provided on the upper surface thereof is mounted on a metal frame, wherein the metal frame is the insulating layer. And a disk device having a structure in which the conductor wiring pattern is removed and the metal plate is exposed and is in contact with the exposed portion of the metal plate of the substrate.