JPH087503A - Recording/reproducing device - Google Patents

Abstract

PURPOSE:To decrease the number of parts and the man-hours for assembly and to make possible a stable turning operation by forming holes facing each other on the upper and back surfaces of a turning body having a magnetic or optical head and turnably supporting this turning body by means of rolling members placed in these respective holes and a supporting member disposed at yokes. CONSTITUTION:A pivot bearings 28 having balls 27 are fitted into holes 5, 11 formed respectively at the upper/lower yoke plates 4, 10. The bearings 28 fitted into the respective yoke plates 4, 10 support metallic balls 31 placed in a through-hole 3 of a head base 1 when the yokes 4, 10 are tightened to a base plate 12. This head base 1 is freely turnably driven around the central axis of the hole 3. Then, the base 1 is supported without clattering by the bearings 28 and the metallic balls 31 and the man-hours for press fitting the shaft to the base 1 are decreased.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a recording / reproducing apparatus in which a magnetic or optical head is moved on a disk by a voice coil motor, and in particular, it has a small number of parts and can perform a stable rotating operation. The present invention relates to a recording / reproducing device having a bearing structure for a voice coil motor.

[0002]

2. Description of the Related Art FIG. 3 is a sectional view showing a bearing structure for a voice coil motor (hereinafter abbreviated as VCM) of a magnetic recording / reproducing apparatus according to the prior art. In FIG. 3, reference numeral 20 denotes a head base having a drive coil 21, and a magnetic head (not shown) is fixed to the other end of the head base 20, that is, the side opposite to the drive coil 21. A hole 22 is provided in the head base 20, and a shaft 23 having conical holes 24 at both ends is press-fitted into the hole 22.

Reference numeral 25 is a cover, and a pivot bearing 28 having a ball 27 in a hole 26 provided in the cover 25.
Is fitted. A hole 30 is formed in the base plate 29 at a position facing the hole 26 formed in the cover 25, and the pivot bearing 28 is also formed in the hole 30.
Is fitted. And these pivot bearings 2
8, 28 allows the conical holes 24, 24 of the shaft 23 to
By supporting the metal balls 31, 31 placed on the head base 20, the head base 20 is rotatable about the axis of the shaft 23.

An upper yoke 33 is arranged between the cover 25 and the head base 20, and a magnet 32 is arranged between the head base 20 and the base plate 29.
The lower yoke 34 fixed to the head base 20 is disposed, and the interaction between the current flowing through the drive coil 21 provided in the head base 20 and the magnetic flux generated between the upper and lower yokes 33 and 34 causes the head base 20 to move to the shaft 23. A drive source that rotates about the axis is generated.

[0005]

By the way, in the above-mentioned magnetic recording / reproducing apparatus according to the prior art, the shaft is press-fitted into the hole provided in the head base, and each of the metal balls mounted on both ends of the shaft is pivotally supported. Since it is supported by the above-mentioned method, there is a problem that a relatively expensive shaft is required and a step of press-fitting this shaft into the head base is required, resulting in an increase in the number of parts and the number of assembling steps.

When the shaft is press-fitted into the head base, there is a risk that the shaft is tilted and press-fitted. In that case, the distance between the magnetic head fixed to the head base and the disk is the rotation of the head base. Data changes between the magnetic head and the disk as it changes depending on the position.
There is also a problem that the reproduction operation is adversely affected.

The present invention has been made in view of the above-mentioned circumstances of the prior art, and an object thereof is to provide a VCM bearing structure having a small number of parts and a small number of assembling steps and capable of performing a stable rotation operation. The present invention is to provide a recording / reproducing device.

[0008]

In order to achieve this object, a recording / reproducing apparatus according to a first aspect of the present invention comprises a yoke plate having a pair of surfaces facing each other, and at least one of the facing surfaces of the yoke plate. And a magnet fixed to the drive coil, and a drive coil mounted on a rotating body having a magnetic or optical head is disposed in a space between the pair of surfaces, and the rotating body is rotated by an electromagnetic action of the magnet and the drive coil. In the recording / reproducing apparatus in which the magnetic or optical head can be moved on the disk by moving, holes facing each other are formed in the upper and lower surfaces of the rotating body, and the rotating body is placed in each of these holes. A supporting member that supports the rolling member is provided on the yoke plate, and the rotating member is rotatably supported by the rolling member and the supporting member.

Further, in the recording / reproducing apparatus according to the second aspect of the present invention, the holes facing each other formed in the rotating body are constituted by through holes.

Further, in the recording / reproducing apparatus according to the third aspect of the present invention, the yoke plate has a hole formed in the vicinity of the supporting member.

[0011]

According to the first aspect of the present invention, the yoke plate is provided with the supporting members for forming the holes facing each other on the upper and lower surfaces of the rotating body and supporting the rolling members placed in the respective holes. Since the rotary member is rotatably supported by the rolling member and the supporting member, not only a relatively expensive shaft is not required, but also the number of steps for press-fitting the shaft into the head base can be reduced. Further, it is possible to prevent the unstable pivoting operation of the head base due to the inclination of the shaft, and it is possible to perform stable data recording / reproducing operation between the head and the disk.

According to the second aspect of the present invention, since the holes that are formed in the rotating body and face each other are formed as through holes, the holes are formed in comparison with the case where the holes are formed in the upper and lower surfaces of the rotating body, respectively. The work man-hours for forming can be reduced.

According to the third aspect of the invention, since the hole is formed in the vicinity of the supporting member of the yoke plate, when the yoke plate is fastened to the chassis with screws, the yoke plate is elastically supported. A force for pressing the rolling member in the direction of the rotating body can be generated in the member, and thereby rattling of the rotating body can be prevented.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a recording / reproducing apparatus according to the present invention will be described below with reference to the drawings. 1 is a sectional view showing a VCM bearing structure of a recording / reproducing apparatus according to an embodiment of the present invention, and FIG. 2 is a plan view showing a state in which upper and lower yoke plates are fastened together with a base plate. In these figures, the same members as those of the conventional technique shown in FIG.

In FIG. 1, reference numeral 1 is a head base provided with a drive coil 2, and a part 1 of the head base 1 is provided.
The cross section of a is thicker than the other parts in the drawing, and a through hole 3 is provided in the thicker part 1a. Reference numeral 4 denotes an upper yoke plate, and the hole 5 provided in the upper yoke plate 4 has a ball 27 described in FIG.
A pivot bearing 28 having is attached. Further, in the upper yoke plate 4, near the pivot bearing hole 5,
As will be described later, a hole 8 for giving elasticity to the upper yoke plate 4 is formed, and a bent portion 6 is formed. 1
Reference numeral 0 denotes a lower yoke plate, and this lower yoke plate 10 is also provided with elasticity at a position facing the hole 8 formed in the upper yoke plate 4 and the pivot bearing hole 5 described above. Hole 1 and hole 1 for fitting the pivot bearing 28
1 is formed.

The lower yoke plate 10 has a head base 1
The magnet 9 is fixed at a position facing the drive coil 2 of the above-mentioned, and the tip portion 7 of the bent portion 6 of the upper yoke plate 4 is in contact with the lower yoke plate 10. Reference numeral 12 denotes a base plate such as a chassis. As will be described later, the upper yoke plate 4 and the lower yoke plate 10 are fastened together with the base plate 12 by fastening members such as screws. The pivot bearings 28, 28 fitted in each support the metal balls 31, 31 mounted in the through hole 3 of the head base 1, whereby the head base 1 rotates about the central axis of the through hole 3. It can be driven freely. Further, 13 is an upper cover of the recording / reproducing apparatus.

Next, referring to FIG. 2, the upper and lower yoke plates 4, 1
The hole formed to give 0 elasticity will be described. In addition, in FIG. 2, the pivot bearing fitting and mounting hole 5,
As for the member 11 provided opposite to the upper and lower yoke plates 4 and 10, only the member provided on the upper yoke plate 4 appears. Now, as shown in FIG. 2, in the vicinity of the pivot bearing fitting holes 5 and 11 formed in the upper and lower yoke plates 4 and 10, arc-shaped openings are formed so as to surround a part of these fitting holes 5 and 11. That is, the elastic force holes 8 and 8 described above are formed. Due to the holes 8 and 8, the upper and lower yoke plates 4 and 10 have elastic force in the elastic portions 14 and 14 shown in FIG.

Therefore, due to this elastic force, as will be described later, when the upper and lower yoke plates 4 and 10 are fastened together to the base plate 12 with screws or the like, the pivot bearings 28 and 28 fitted in the holes 5 and 11 are attached. A force that urges the metal balls 31, 31 toward the head base 1 side is generated. The upper and lower yoke plates 4,
The shape of the hole 8 formed in the hole 10 is not limited to that shown in FIG. 2, and may be, for example, a U-shape that surrounds the holes 5 and 11, or may be a polygon such as a rectangle. Alternatively, the fitting holes 5 and 11 may be surrounded by two or more circular holes, and may be appropriately selected in consideration of the material and plate thickness of the yoke plates 4 and 10.

Next, referring to FIG. 2, the upper and lower yoke plates 4, 1
A state in which 0 is fastened together with the base plate 12 will be described. As shown in FIG. 2, the upper yoke plate 4 and the lower yoke plate 10 are fastened together with the base plate 12 by fastening members 15, 15 such as screws. At this time, the upper yoke plate 4 is in a state in which its bent front end portion 7 is strongly pressed against the lower yoke plate 10, that is, the elastic portions 14, 14 are formed.
Until the tightening members 15, 15
Is pressed in the direction of the lower yoke plate 10.

In this state, the dimension between the upper and lower yoke plates 4 and 10 located on the tightening members 15 and 15 side with respect to the elastic force holes 8 and 8 is the fitting hole 5 to the elastic force holes 8 and 8. , 11 which is smaller than the dimension between the upper and lower yoke plates 4 and 10. Therefore, the upper and lower yoke plates 4, 10
The base plate 12 by the tightening members 15, 15.
When tightened together, the pulling forces act on the upper and lower yoke plates 4, 10, and due to the elastic portions 14, 14 provided on the yoke plates 4, 10, the holes 5, 5 in the yoke plates 4, 10,
A force for urging the metal balls 31, 31 toward the head base 1 side is generated in the pivot bearings 28, 28 fitted in 11.

Therefore, the head base 1 is supported by the pivot bearings 28, 28 and the metal balls 31, 31 without backlash, and flows to the magnet 9 fixed to the lower yoke plate 10 and the drive coil 2 provided to the head base 1. The head base 1 is driven rotatably around the central axis of the through hole 3 by the action of the electric current, and the drive coil 2 of the head base 1
A magnetic head (not shown) as a functional member fixed to the opposite side can be moved to a desired position on the disk.
At this time, since the shaft is not used as in the prior art,
Since it is possible to prevent the distance between the magnetic head and the medium from varying due to the shaft being tilted and press-fitted, the distance between the magnetic head and the medium can be kept constant regardless of the rotational position of the head base 1. , Can read and write stable data.

In order to generate a force for urging the metal balls 31, 31 toward the head base 1 in the pivot bearings 28, 28, the elastic force holes 8, 8 are formed in the upper and lower yoke plates 4, 10. Instead of this, a spring member such as a wave washer may be interposed between the pivot bearing 28 and the upper yoke plate 4 and / or between the pivot bearing 28 and the lower yoke plate 10. Further, in the above-mentioned embodiment,
Although the through hole 3 is formed in the head base 1 and the metal balls 13, 13 are placed in the through hole 3, instead of this,
Hemispherical holes facing each other or conical holes facing each other may be formed on the upper and lower surfaces of the head base 1. Further, in the above-described embodiment, the magnet 9 is fixed to the lower yoke plate 10, but instead of this,
The magnet 9 may be fixed to the upper yoke plate 4, or may be fixed to both the upper and lower yoke plates 4 and 10. Further, in the above embodiments, the case where the present invention is applied to the magnetic recording / reproducing apparatus has been described, but the present invention is not limited to this, and an optical recording / reproducing apparatus such as a CD-ROM or a magneto-optical recording apparatus. It can also be used in other recording / reproducing devices such as reproducing devices.

[0023]

According to the first aspect of the invention, the yoke plate is provided with the supporting members for forming the holes facing each other on the upper and lower surfaces of the rotating body and for supporting the rolling members placed in the respective holes. Since the rolling member is rotatably supported by the rolling member and the supporting member, not only a relatively expensive shaft becomes unnecessary, but also the number of steps for press-fitting the shaft into the head base can be reduced. Further, it is possible to prevent the unstable pivoting operation of the head base due to the inclination of the shaft, and it is possible to perform stable data recording / reproducing operation between the head and the disk.

According to the second aspect of the present invention, since the holes facing each other formed in the rotating body are formed as through holes, compared to the case where holes are formed in the upper and lower surfaces of the rotating body, respectively, the holes are formed. The work man-hours for forming can be reduced.

According to the third aspect of the invention, since the hole is formed in the vicinity of the support member of the yoke plate, when the yoke plate is fastened to the chassis with screws, the yoke plate is elastically supported. A force for pressing the rolling member in the direction of the rotating body can be generated in the member, and thereby rattling of the rotating body can be prevented.

[Brief description of drawings]

FIG. 1 is a VC of a recording / reproducing apparatus according to an embodiment of the present invention.
It is a sectional view showing a bearing structure for M.

FIG. 2 is a plan view showing a state in which upper and lower yoke plates are fastened together with a base plate.

FIG. 3 is a cross-sectional view showing a VCM bearing structure of a conventional magnetic recording / reproducing apparatus.

[Explanation of symbols]

 1 Head Base 2 Drive Coil 3 Through Hole 4 Upper Yoke Plate 5 Pivot Bearing Hole 8 Elastic Force Hole 9 Magnet 10 Lower Yoke Plate 11 Pivot Bearing Hole 28 Pivot Bearing 31 Metal Ball

Claims (3)

[Claims] 1. A yoke plate having a pair of surfaces facing each other, and a magnet fixed to at least one of the facing surfaces of the yoke plate, wherein a magnetic or optical head is provided in a space between the pair of surfaces. Recording / reproducing in which a drive coil mounted on a rotating body is disposed, and the magnetic body or the optical head is moved on a disk by rotating the rotating body by an electromagnetic action of the magnet and the drive coil. In the device, holes that face each other are formed on the upper and lower surfaces of the rotating body, and the yoke plate is provided with a supporting member that supports a rolling member placed in each of the holes.
A recording / reproducing apparatus in which the rotating member is rotatably supported by the rolling member and the supporting member. 2. The recording / reproducing apparatus according to claim 1, wherein the holes formed in the rotating body and facing each other are through holes. 3. The recording / reproducing apparatus according to claim 1, wherein the yoke plate has a hole formed in the vicinity of the supporting member.