JPH07296472A - Disk table - Google Patents

Abstract

PURPOSE:To simplify manufacturing processes and to enhance durability and environmental resistance by holding an attracting magnet with a supporting part formed by a part of a projecting part to be inserted into a chucking hole and a plate of a recording disk. CONSTITUTION:The recording disk 101 is formed with the chucking hole 102 in the center to be as a positioning reference, the chucking plate 105 made of metal fitted into a recessed part 104 and a projected line 103 to be supported around the plate 105. A table member 1 is provided in its center with a protruded part 3 to be fitted into the hole 102, a recessed part 4 for fitting a magnet 5 on an upper end of the part 3 and a supporting hole 8 into which a driving shaft 10 of a spindle motor is fitted. Supporting pieces 9 are formed around this hole 8 by melting a part of the upper end side of a cylindrical part 7 projected from the bottom surface of the recessed part 4, deforming this part into pieces and solidifying them. The plate 105 of the disk 101 is attracted by the magnet 5 held securely by these individual supporting pieces 9 to perform chucking. By this method, the manufacturing processes can be simplified, and the durability and the environmental resistance can thus be enhanced.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disk table for positioning and holding recording disks such as magnetic disks, optical disks and magneto-optical disks.

[0002]

2. Description of the Related Art Conventionally, recording disks such as magnetic disks, optical disks and magneto-optical disks have been proposed. A disk drive device for recording and reproducing information signals on such a recording disk has been proposed.

The disk drive device has a disk table for positioning, holding and rotating the recording disk. This disc table is made of polycarbonate (polycarbonate, PC), polyphenylene sulfide (polyphenylenenes).
It is formed in a substantially disc shape from a synthetic resin material such as sulfide, PPS) and is attached to the drive shaft of the spindle motor.

A chucking hole serving as a positioning reference is formed in the center of the recording disk. Further, this recording disk has a chucking plate (clamping plate) formed of a metal material and attached so as to close the chucking hole.

The disc table integrally has a protrusion portion which fits in the chucking hole in the central portion of the upper surface. A magnet for attracting the chucking plate is attached to the protrusion. The flat portion on the outer peripheral side of the protrusion is a table portion on which the peripheral portion of the chucking hole of the recording disk is placed.

In the disc table, the projection is fitted into the chucking hole to perform horizontal positioning, that is, centering, of the recording disc, and the peripheral portion of the chucking hole is fixed. By mounting the recording disk on the table, the recording disk is positioned in the height direction. Then, the recording disc is held in a state of being positioned on the disc table by the magnet attracting the chucking plate.

The disc table is rotated by the spindle motor together with the recording disc while the recording disc is positioned and held.

In the disk drive device, information signals are written and read by a magnetic head or an optical pickup device on a recording disk which is rotated together with the disk table.

[0009]

By the way, in the disk table as described above, the magnet is fixed to the protrusion by an ultraviolet curable adhesive. The UV-curable adhesive has good adhesiveness to the magnet, but the P that forms the protrusion is formed.
Adhesiveness to synthetic resin materials such as C and PPS is not good, and there is a risk of peeling from the protrusions due to changes in environmental conditions such as temperature and humidity.

The reason why a synthetic resin material such as PC or PPS is used as a material for forming the disk table is that these materials provide high dimensional accuracy.

Fixing the magnet to the protrusion with an ultraviolet-curable adhesive complicates the process of assembling and manufacturing the disc table. That is, in the above process, it is necessary to perform ultraviolet irradiation for about 30 seconds in order to cure the ultraviolet curable adhesive, and it is difficult to shorten the process time.

Therefore, the present invention is proposed in view of the above-mentioned circumstances, and it is easy to attach a magnet,
An object of the present invention is to provide a disk table that can be quickly mounted, has good environment resistance and durability for attachment of the magnet, and prevents the magnet from falling off.

[0013]

In order to solve the above problems and achieve the above objects, a disk table according to the present invention has a chucking hole peripheral portion of a recording disk mounted thereon in a height direction of the recording disk. A table portion for positioning, a projection portion projectingly formed in the central portion of the table portion and fitted in the chucking hole for positioning the recording disk in the horizontal direction, and the projection portion supported by the projection portion A magnet for attracting a chucking plate attached in a state of closing the chucking hole, wherein the magnet is formed by arranging the magnet on the protrusion and then melting and deforming a part of the protrusion. It is supposed to be held by a support piece formed by being post-solidified.

Further, according to the present invention, in the above-mentioned disc table, the magnet has a supporting recess into which a supporting piece enters.

Further, according to the present invention, in the disc table, the magnet has a ring shape, and the support concave portion is formed over the entire circumference of the inner peripheral portion or the outer peripheral portion. It is a thing.

Further, according to the present invention, in the disc table, the supporting recesses are formed symmetrically on the front surface side and the back surface side of the magnet.

[0017]

In the disk table according to the present invention, the magnet that is supported by the projection that fits into the chucking hole of the recording disk and that attracts the chucking plate of the recording disk is arranged after the magnet is placed on the projection. Since a part of the protruding portion is held by the supporting piece formed by melting, deforming, and then solidifying, it can be reliably held even if the environmental conditions change.

Further, in the above-mentioned disc table, when the magnet has a supporting recess for the support piece to enter, the support piece does not protrude from the main surface portion of the magnet and Can hold a magnet.

Further, in the above disc table,
When the magnet has a ring shape and the supporting recess is formed over the entire circumference of the inner peripheral portion or the outer peripheral portion, the magnet is attached to the protruding portion. Moreover, since it is not necessary to perform positioning in the rotation direction, the mounting is easy.

Then, in the above-mentioned disc table,
If the support recesses are formed symmetrically on the front surface side and the back surface side of the magnet, it is not necessary to distinguish the front side and the back side when mounting the magnet on the protrusion. Is easy.

[0021]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Specific embodiments of the present invention will be described below with reference to the drawings. The disc table according to the present invention is
It is used in a disk drive device that records and reproduces information signals on a recording disk such as a magnetic disk, an optical disk, and a magneto-optical disk, and positions and holds the recording disk for rotation operation. .

As shown in FIG. 1, this disc table has a table member 1 which is formed in a substantially disc shape and serves as a main body of the disc table. The table member 1 is provided with a support hole 8 along the central axis.
In the table member 1, the drive shaft 10 of the spindle motor is fitted into the support hole 8 so that the drive shaft 10
Is attached to.

The table member 1 is made of polycarbonate (PC), polyphenylene sulfide (polyphenylene sulfide).
(de, PPS), which are integrally formed of a synthetic resin material capable of obtaining high dimensional accuracy.

A chucking hole 102 serving as a positioning reference is formed in the center of the recording disk 101. The recording disk 101 also has a disk-shaped chucking plate (clamping plate) 105 that is attached so as to close the chucking hole 102. The chucking plate 105 is fitted and mounted in a plate mounting recess 104 formed on the upper surface of the recording disk 101 coaxially with the chucking hole 102 and having a diameter slightly larger than the chucking hole 102. ing. A peripheral portion of the chucking hole 102 on the lower surface of the recording disk 101 is projected downward,
An annular supported ridge 103 is formed.

The recording disk 101 is rotatably housed in a cartridge 106, as shown in FIG. 5, to form a disk cartridge 112. The cartridge 106 is formed in a thin casing shape having a substantially rectangular main surface portion whose one side substantially corresponds to the diameter of the recording disk 101. This cartridge 106
In the central portion of the lower surface of the support, the supported ridge 103, the chucking hole 102, and the chucking plate 1
Chucking opening 1 for exposing 05 to the outside
07 are formed. In addition, the cartridge 106
A recording / reproducing opening 108 is formed in the main surface portion of the recording disk 101 so as to expose a part of the main surface portion of the recording disk 101 to the outside. This recording / playback opening 1
08 can be opened and closed by a shutter member 109.

The disc cartridge 112, as shown by the arrow C in FIG.
When it is inserted in the forward direction, as shown by an arrow D in FIG.
The shutter member 109 is opened. The cartridge 106 has a pair of positioning holes 110, 1 formed on the lower surface thereof in the disk drive device.
It is positioned and held with reference to 11. At this time, the recording disk 101 is held by the disk table according to the present invention.

The table member 1 integrally has a protrusion 3 which fits in the chucking hole 102 at the center of the upper surface. The protrusion 3 has a substantially truncated cone shape. An annular magnet mounting recess 4 into which the magnet 5 is fitted and arranged is formed on the upper end surface of the protrusion 3. That is, the peripheral portion of the support hole 8 is a cylindrical portion 7 protruding from the bottom surface of the magnet mounting recess 4. The flat portion on the outer peripheral side of the protrusion 3 serves as the table portion 2 on which the lower end of the supported protrusion 103 of the recording disk 101 is placed.

An annular magnet 5 for attracting the chucking plate 105 is fitted in the magnet mounting recess 4. An annular yoke 14 is interposed between the magnet 5 and the bottom surface of the magnet mounting recess 4.

The magnet 5 is shown in FIGS. 1, 3 and 4.
As shown in FIG. 5, a plurality of support pieces 9 formed by melting and deforming a part of the upper end side of the cylindrical portion 7 and then solidifying the same.
Is held by. That is, each of the support pieces 9 is
As shown in FIG. 2, a plurality of melting margin portions 11 projecting from the upper end of the cylindrical portion 7 are melted and crushed toward the outer peripheral side as indicated by an arrow A in FIG. To be done. The melting of the melting margin portion 11 can be performed by means of ultrasonic melting, so-called swaging, melting by heating, or the like.

The magnet 5 has a supporting recess 6 into which the supporting pieces 9 are inserted. The support recess 6 is formed on the inner peripheral side portion of the magnet 5 over the entire circumference. The support concave portion 6 is formed by forming a tapered inclined surface portion in a state where the inner peripheral edge of the upper surface portion (surface portion) of the magnet 5 is cut.

As shown in FIGS. 3 and 4, the support pieces 9 extend above the support recesses 6 so that the support pieces 9 do not project upward from the upper surface of the magnet 5.
This magnet 5 can be held.

Further, since the magnet 5 has the supporting concave portion 6 over the entire circumference, it has a shape of a rotating body, and when it is attached to the projecting portion 3, positioning in the rotational direction is performed. No need.

Further, the magnet 5 also has a defective portion having the same shape as the supporting concave portion 6 on the lower surface portion (back surface portion). That is, the magnet 5 has a symmetrical shape in which the front surface portion and the back surface portion are mirror images of each other. Therefore, this magnet 5 is
There is no need to distinguish between the front and back when attaching to.

In this disc table, as shown in FIG. 3, the protrusion 3 is formed in the chucking hole 102.
When the recording disc 101 is fitted, the recording disc 101 is positioned in the horizontal direction, that is, centering is performed, and the supported ridge 103 is placed on the table portion 2 to record the recording. The positioning of the disc 101 in the height direction is performed. Then, as indicated by an arrow B in FIG. 3, the magnet 5 attracts the chucking plate 105, so that the recording disk 101.
Are held in a state of being positioned on the table member 1. At this time, a gap of, for example, about 0.3 mm is formed between the upper surface of the magnet 5 and the lower surface of the chucking plate 105.

The table member 1 is rotated by the spindle motor together with the recording disk 101 while the recording disk 101 is positioned and held.

In the disk drive device, information signals are written and read by the magnetic head or the optical pickup device on the recording disk 101 which is rotated together with the table member 1.

In the disc table according to the present invention, the support recess formed in the magnet 5 is
The support recess 12 is not limited to the taper shape as in the above-described example, and as shown in FIG. 6, the support recess 12 may be formed in a state in which the ridge of the magnet 5 is cut into a step shape. Even in this case, the support recess 12 is provided with the magnet 5
Can be formed over the entire circumference of the inner peripheral portion of the. Also,
A recess having the same shape as the support recess 12 may be formed in the lower surface of the magnet 5 so that the lower surface side portion and the upper surface side portion of the magnet 5 have symmetrical shapes. Even in the magnet 5 having the supporting recess 12, the supporting pieces 9 can hold the magnet 5 without protruding above the upper surface of the magnet 5.

Further, in the magnet 5, the support concave portion is not limited to the one formed on the inner peripheral side as in each of the above-mentioned examples, and as shown in FIG. 7, the support concave portion 13 formed on the outer peripheral side. May be Even in this case, the support recess 13 can be formed over the entire circumference of the outer peripheral portion of the magnet 5. In addition, the magnet 5
A recess having the same shape as the support recess 13 can be formed on the lower surface of the magnet 5, so that the lower surface side portion and the upper surface side portion of the magnet 5 can be symmetrical. When the support recess 13 is formed on the outer peripheral side of the magnet 5 as described above, each of the support pieces 9 has a fusion allowance portion formed on the outer peripheral side of the magnet mounting recess 4 so as to project. It is formed by being melted and crushed to the inner peripheral side.

Even in the magnet 5 having the supporting recess 13, the supporting pieces 9 can hold the magnet 5 without protruding above the upper surface of the magnet 5.

In the disc table according to the present invention, the magnet does not have to be ring-shaped but may be disc-shaped, for example. In this case, the magnet mounting recess is formed as a circular hole rather than the annular shape as in the above-described example. Further, in this case, the support recess 13 can be formed on the outer peripheral side portion of the magnet.

[0041]

As described above, in the disc table according to the present invention, the magnet that is supported by the protrusions that fit into the chucking holes of the recording disc and attracts the chucking plate of the recording disc is After being arranged on the protrusion, a part of the protrusion is melted, deformed, and then solidified to be held by a support piece. Therefore, the magnet is reliably held by the support piece and does not fall off even if the environmental conditions change.

Further, in the above-mentioned disc table, when the magnet has a supporting recess for the support piece to enter, the support piece does not protrude from the main surface portion of the magnet and Can hold a magnet.

Further, in the above disc table,
When the magnet has a ring shape and the supporting recess is formed over the entire circumference of the inner peripheral portion or the outer peripheral portion, the magnet is attached to the protruding portion. Moreover, since it is not necessary to perform positioning in the rotation direction, the mounting is easy.

Then, in the above disk table,
If the support recesses are formed symmetrically on the front surface side and the back surface side of the magnet, it is not necessary to distinguish the front side and the back side when mounting the magnet on the protrusion. Is easy.

That is, the present invention provides a disk table in which a magnet can be easily and quickly attached, and which has good environment resistance and durability with respect to the attachment of the magnet, and in which the magnet is prevented from coming off. Is something that can be done.

[Brief description of drawings]

FIG. 1 is a partially cutaway perspective view showing the structure of a disk table according to the present invention and a main part of a recording disk held by the disk table.

FIG. 2 is a longitudinal sectional view of an essential part showing a state in which the disc table is being manufactured.

FIG. 3 is a longitudinal cross-sectional view of a main part showing a configuration of the main part of the disc table and a recording disc held on the disc table.

FIG. 4 is a plan view showing a configuration of a main part of the disc table.

FIG. 5 is a perspective view showing a configuration of a disc cartridge including the recording disc.

FIG. 6 is a vertical cross-sectional view showing another example of the configuration of the disc table.

FIG. 7 is a vertical sectional view showing still another example of the configuration of the disc table.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 table member 2 table part 3 protrusion part 5 magnet 6 support recessed part 9 support piece 10 drive shaft 101 recording disk 102 chucking hole 103 supported ridge 105 chucking plate

Claims (4)

[Claims] 1. A table portion on which a peripheral portion of a chucking hole of a recording disc is placed and which positions the recording disc in a height direction, and a protruding portion is formed at a central portion of the table portion and is fitted into the chucking hole. A magnet for attracting a chucking plate supported by the protrusion and attached to the recording disc so as to close the chucking hole. The disk table, wherein the magnet is held by a support piece formed by arranging the magnet on the protrusion and then solidifying the magnet by melting and deforming a part of the protrusion. 2. The disk table according to claim 1, wherein the magnet has a supporting recess into which the supporting piece enters. 3. The disk table according to claim 2, wherein the magnet has a ring shape, and the supporting recess is formed over the entire circumference of the inner peripheral portion or the outer peripheral portion. 4. The disk table according to claim 3, wherein the supporting recesses are formed symmetrically on the front surface side and the back surface side of the magnet.