JP3336071B2 - Recording disk drive - Google Patents

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 for writing and reading recording by rotating a hard recording disk such as a fixed magnetic disk or a magneto-optical disk.

[0002]

2. Description of the Related Art For example, a recording disk drive for rotating a magnetic disk, a magneto-optical disk or the like is expected to have a large capacity in recent years, while corresponding to a laptop type, a notebook type personal computer or a semiconductor recording device. At present, demands for smaller and thinner devices are increasing. In a drive device on which a recording disk having a diameter of 1.8 inches or less is mounted, dimensional restrictions on a spindle motor for rotating and driving the recording disk increase in accordance with the reduction in the size of the device.
In particular, the space occupied by so-called magnetic circuit components such as an armature and a rotor magnet for obtaining a rotational driving force is restricted.

[0003] For this reason, in order to secure a predetermined rotational driving force, the present applicant has already proposed in Japanese Patent Application No. 5-57767 a spindle motor which can be reduced in size, in particular, reduced in thickness. As shown in FIG. 5, this spindle motor has a rotor a and an armature g of a rotary drive section which are extended in a flat shape, and a hub (recording disk holding portion) b formed integrally with the rotor a and a rotary drive. It is configured separately from the part. And the recording disk d mounted on this
Is mounted on the mounting portion j of the hub b and fixed by the clamp member c, thereby being driven to rotate coaxially with the spindle motor.

[0004]

However, according to the recording disk drive having the above-described structure, the rotor a of the spindle motor extends outward in the circumferential direction. For this reason, the recording head h is disposed only on the upper surface e side of the recording disk d, and the lower surface f side is difficult due to space restrictions. Therefore, in the spindle motor shown in the figure, the drive unit can be reduced in size, but the recording head h cannot seek on both sides of the recording disk as in a large recording disk drive unit, and it is difficult to increase the capacity.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-described problems in the prior art, and has as its object to reduce the size of the device, particularly, to increase the capacity while reducing the thickness. An object of the present invention is to provide a recording disk drive that can be realized.

[0006]

In order to solve the above-mentioned problems, the first means of the recording disk drive of the present invention comprises:
A recording disk in which a recording layer is formed on the surface of a hard disk-shaped substrate, a spindle motor that rotates the recording disk, and a recording head that writes and / or reads signals to and from the recording layer of the recording disk. A swing arm for moving the recording head in a substantially radial direction on the recording disk; and a driving unit for driving the swing arm, wherein the recording layers on both surfaces of the recording disk are , Each
At least one pair of recording heads corresponding to both sides of the recording disk are mounted on the swing arm, and the pair of heads are formed on the swing arm.
Can be recorded on both sides of the recording disc.
Both the range and the rotation of the swing arm at a fixed angle
The swing arm is positioned at a different radial distance from the support shaft position so as to correspond to the moving range of the recording head .

[0007]

[0008]

According to the recording disk drive of the present invention ,
The pair of recording heads are positioned at different radial distances from the support shaft position in the swing arm. For this reason, the recording range of the recording layer which can be used in advance on one side is restricted by a configuration constraint such as a recording disk being mounted on a spindle motor, for example.
As a result, even if the range is narrowed, the pair of recording heads can write / read the recording layer over both sides of the recording disk correspondingly. In other words, the smaller radial distance of the recording head can correspond to the surface side where the recording layer of the recording disk is smaller. For this reason, it is possible to effectively use one of the recording surfaces that has not been used conventionally in a small recording disk drive.

[0009]

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a recording disk drive according to the present invention will be described with reference to FIGS. FIGS. 1 and 2 show a magnetic disk drive device which is mounted with one hard magnetic disk and is driven to rotate. FIG. 1 is a cross-sectional view showing a part of the device, and FIG. FIG. 4 is a plan view showing a state where a lid body attached to the vehicle is removed.

1 and 2, a member 10 is a base plate, which is formed by using an aluminum material or the like. The base plate 10 constitutes the bottom of the magnetic disk drive, and is formed integrally with a side wall of the apparatus (not shown), and forms an outer shell of the apparatus. The internal space created by the base plate 10 is such that the upper plate (lid) 11 is
Is closed by being screwed into a mounting hole 46 formed in each of the four corners.

The member 2 is a spindle motor for rotatingly driving a magnetic disk (hereinafter referred to as a disk) 1. The spindle motor 2 includes a shaft 24 erected and fixed on the base plate 10, a rotor hub 26 on which the disk 1 is coaxially mounted and integrally rotates, and a bearing externally fitted on the shaft 24 and rotatably supporting the rotor hub 26. 28. Further, inside the spindle motor 2, a rotor magnet 27 is annularly disposed on an inner peripheral portion of a rotor hub 26, and an armature 25 is externally fitted on the shaft 24 so as to face the rotor magnet 27 in a radial direction. It is provided. The armature 25 includes a required coil 35 on the stator core 34.
Is formed by winding. Therefore, the electromagnetic action of the armature 25 and the rotor magnet 27 causes the rotor hub 2
6 is driven to rotate.

The disc 1 is mounted on a flat mounting portion 36 on the upper portion of the rotor hub 26, and a clamp 29 is mounted on the upper surface of (the inner peripheral side of) the disk 1.
Is attached. Clamp 29 is mounting screw 3
0 and is screwed to the rotor hub 26, and this clamp 2
The disc 1 is integrally fixed to the rotor hub 26 by the pressing force 9. In addition, as shown in FIG.
Is inserted into the hole 50 of the base plate 10 and is fixed upright by the mounting screw 32. Similarly, the upper end of the shaft 24 is fixed to the upper plate 11 by mounting screws 33.

The spindle motor 2 has a portion for mounting the disk 1 at an upper position in FIG. 1 of the rotor hub 26, and a driving element component for driving the rotor hub 26 to rotate is positioned at a lower portion. Therefore, the disk 1 mounted on the spindle motor 2 has its upper surface 8 used as a recording area covering substantially the entire recording layer. However, since the lower surface 9 of the disk 1 is mounted on the mounting portion 36 of the rotor hub 26, the recording range on the recording layer is restricted by the mounting portion 36.

The member 3 is a swing arm, and is composed of a pair of upper and lower support portions 20 and 21 fixed to the pivot 4, and a pair of upper and lower suspensions 22 and 23 connected to the support portion. A pair of upper and lower magnetic heads 6 and 7 are mounted on the tip of the swing arm 3, that is, on the respective tips of the suspensions 22 and 23. The upper magnetic head 6 is provided corresponding to the upper surface 8 of the disk 1, and the lower magnetic head 7 is provided corresponding to the lower surface 9 of the disk 1.

The pivot 4 to which the pair of upper and lower support portions 20 and 21 is fixed includes a main body portion 19 for fixing the upper and lower support portions 20 and 21, a bearing 17 provided coaxially with the main body portion 19,
And a support shaft 12 rotatably supporting the main body 19 via the bearing 17. The voice coil 5 is mounted on the main body 19, and is arranged point-symmetrically with respect to the support shaft 12. One lower end of the support shaft 12 is fixed to the base plate 10, and the other upper end is fixed to and supported by the support plate 18.

A fan-shaped magnet 13 is fixed to a lower portion of the support plate 18 via a magnetic yoke 15.
The voice coil 5 is positioned on the support axis with a slight gap from the magnet 13. Further, a fan-shaped magnet 14 is disposed between the voice coil 5 and the support axis with a slight gap therebetween.
6 and is fixed to the base plate 10. A voice coil 5 and a magnet 13 arranged to sandwich the voice coil 5;
The swing arm 3 is driven to rotate by an electromagnetic action with the swing arm 3. By the rotation of the swing arm 3, the pair of upper and lower magnetic heads 6 and 7 move on the disk 1 in a substantially radial direction.

According to the magnetic disk drive of this embodiment, the pair of upper and lower magnetic heads 6 and 7 mounted on the swing arm 3 are supported at the support shaft position 40 which is the center point of the support shaft 12.
And the radial distances to the magnetic heads 6 and 7 are differently positioned. This means that the radial distance of the upper magnetic head 6 in the swing arm 3 corresponds to the fact that the upper surface 8 of the disk 1 mounted on the spindle motor 2 is used as a recording area substantially over the entire recording layer. Due to the large setting. Since the lower surface 9 of the disk 1 is mounted on the mounting portion 36 of the rotor hub 26, the recording range on the recording layer is
Accordingly, the radial distance of the lower magnetic head 7 in the swing arm 3 is set to be small.

Therefore, by rotating the swing arm 3, the disk 1 having different recording ranges on the upper and lower surfaces 8, 9 can be written and / or read on both surfaces. It is possible to increase the recording capacity as compared with the case where the storage capacity is not used. In this case, a pair of upper and lower magnetic heads 6 and 7 in the swing arm 3
0 and each of the magnetic heads 6 and 7 can be realized by making the radial distances different, and in particular, one (for example, the lower side)
It is not limited that the other (upper) magnetic head 6 is positioned on a straight line connecting the magnetic head 7 and the support shaft position 40.

FIG. 3 is a schematic plan view showing the positional relationship between the pair of upper and lower magnetic heads 6 and 7 and the recording areas of the upper and lower surfaces 8 and 9 of the disk 1 in FIG. In FIG. 3, part number 41 indicates the range of the recording layer on the lower surface 9 of the disk 1, and part number 42 indicates the range of the recording layer on the upper surface 8 of the disk 1. Therefore, when the pair of upper and lower magnetic heads 6 and 7 are both substantially arranged on a straight line connecting to the support shaft position 40, the movement of the swing arm 3 causes the upper magnetic head 6 to move within the movement range of the part number 43. So that the lower magnetic head 7 corresponds to the movement range of the part number 44.
Should be set. By doing so, the movement of the swing arm 3 can be suppressed to the minimum (rotation angle α), and the pair of upper and lower magnetic heads 6 and 7 can cope with the recording layers over both surfaces of the disk 1 without shortage. For this reason, useless movement of the swing arm 3 is suppressed, so that the required space can be minimized, and the size can be reduced. And
Since it is possible to cope with the recording layers on both sides of the disc 1, a high capacity can be achieved.

FIG. 4 is a sectional view showing a portion of the spindle motor 2 in the driving device already shown. For example, when the spindle motor 2 is removed from the apparatus, particularly when the mounting screw 31 is loosened and the upper plate 11 is removed, chips of the mounting screw 31 may be scattered into the disk chamber 48. In order to prevent this, if the upper plate 11 is loosened by sucking air from below the shaft 24, the above-described accident is prevented. That is, the axis 2
The mounting screw 32 at the lower end of 4 is removed, and the suction pipe 39 connected from the vacuum suction means is connected to the opening 37 of the shaft 24. An opening 3 of the shaft 24 is provided at the tip of the suction tube 39.
An attachment 38 corresponding to 7 is provided, and is connected to the shaft 24 for use. Shaft 2 of suction tube 38
The method of connecting to 4 is not limited to this, and various methods can be used.

Although the embodiment of the brushless motor according to the present invention has been described in detail above, the present invention is not limited to this.
Changes and the like can be freely made within the scope of the present invention. For example, in the present embodiment, the drive device in which one recording disk is mounted is shown, but the present invention is also applicable to a case where a plurality of recording disks are used. In addition to a type in which the swing arm is positioned on the disk only while the disk is rotating, a drive device in which the swing arm is positioned on the disk regardless of rotation or stop of the disk may be used. In addition, the configuration and shape of the spindle motor and the swing arm are freely designed, and the recording disk is suitable for a magneto-optical disk or an optical disk in addition to a magnetic disk. However, it is needless to say that a hard disk can be freely selected. No.

[0023]

Since the recording disk drive of the present invention has the above-described configuration, the following effects can be obtained. That is, the recording head can be made to correspond to both sides of the recording layer of the recording disk without any shortage, and unnecessary movement of the magnetic head and thus the swing arm can be suppressed. For this reason, a recording disk drive capable of realizing a high capacity while reducing the size, especially the thickness of the recording disk drive can be obtained.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a recording disk drive device according to an embodiment of the present invention.

FIG. 2 is a plan view of the inside of the recording disk drive device according to the embodiment of the present invention.

FIG. 3 is a schematic diagram of FIG.

FIG. 4 is a sectional view showing a part in FIG. 1;

FIG. 5 is a sectional view of a spindle motor.

[Explanation of symbols]

 Reference Signs List 1 magnetic disk 2 spindle motor 3 swing arm 4 pivot 5 voice coil 6,7 magnetic head 10 base plate 12 support shaft 13,14 magnet 17,28 bearing 18 support plate 24 shaft 25 armature 26 rotor hub 27 rotor magnet 29 clamp 36 mounting portion 39 suction pipe 40 support shaft position 48 disk chamber 50,51 hole

Claims (1)

(57) [Claims] 1. A recording disk in which a recording layer is formed on a surface of a hard disk-shaped substrate, a spindle motor for rotating the recording disk, and writing and / or reading of signals to and from the recording layer of the recording disk. a recording head for, and the swing arm for moving the recording head to a substantially radial direction on the recording disk, the recording disk drive device provided with the, and driving means for driving said swing arm, both surfaces of the recording disc Record of
The layers are formed so that each recordable area is different.
At least a pair of recording heads corresponding to both sides of the recording disk are mounted on the swing arm, and the pair of heads are mounted on both sides of the recording disk.
Each recordable range and the fixed angle of the swing arm
So that the range of movement of both recording heads by the rotation of
, The radial distance from the support shaft position in the swing arm is positioned is different from a recording disk drive device, characterized in that.