JP2605414Y2 - Disc clamp mechanism - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disk clamping mechanism, and more particularly to a mechanism for clamping a disk on a turntable using a magnetic attraction force.

[0002]

2. Description of the Related Art FIG. 5 shows a conventional CD-ROM clamp mechanism 10.

In the figure, reference numeral 11 denotes a turntable, which is fixed to a spindle 12.

[0004] Reference numeral 13 denotes a clamper, which is loosely fitted and supported on a support member 14.

The turntable 11 is made of a synthetic resin and has a peripheral CD-ROM support 11a and a center hub 11b at the center.

Reference numeral 15 denotes a ring-shaped permanent magnet, which is adhered to an inner portion of the center hub 11b by an adhesive 16.

The clamper 13 has a structure in which a circular iron plate is formed by insert molding in the center.
3a and a surrounding synthetic resin part 13b.

[0008] The clamper 13, the steel plate portion 13a is attracted magnetically by the permanent magnet 15 and is biased by the force F in the arrow Z ₁ direction.

The disc 20 is moved by the clamper 13
The light is pressed and clamped on the support portion 11a of the turntable 11 with a force F, and is rotated in this state and reproduced by an optical head (not shown).

[0010]

Since the permanent magnet 15 is bonded and fixed by the adhesive 16, an operation for applying the adhesive and an operation for pressing the permanent magnet 15 for bonding are required. The production of the turntable 11 to be constituted was troublesome.

The permanent magnet 15 has a relatively large thickness t _{1 and a} large size, so that the cost is high.

Therefore, an object of the present invention is to provide a disk clamping device which solves the above-mentioned problems.

[0013]

According to a first aspect of the present invention, a permanent magnet is incorporated, and a turntable for supporting a disk is attracted to the turntable by the magnetic force of the permanent magnet. In a disk clamping device having a clamper for clamping on a table, the turntable is an outsert molded product comprising a ferromagnetic metal disk and a synthetic resin center hub, and the metal disk is A configuration including an inner peripheral portion that is exposed to the inside of the portion and in which the permanent magnet is magnetically attracted, and a disk support portion that protrudes outward from the center hub portion and supports the disk. It was done.

[0014]

The structure in which the permanent magnet is attracted to the inner peripheral portion of the metal disk acts so that the bonding conventionally used for fixing the permanent magnet is not required.

The inner peripheral portion of the metal disk functions to function as a back yoke for the permanent magnet. Metal disk bag
The part protruding outward from the center hub is the disk
The structure that forms the support part depends on the mechanical strength of the disk support part.
Enhance.

[0016]

FIG. 1 shows a disk clamp mechanism 30 according to an embodiment of the present invention.

FIG. 3 shows a CD-ROM device 31 to which the disk clamp device 30 of FIG. 1 is applied.

The disk 20 is carried on a tray 32 and carried into a CD-ROM device 31. continue,
The mechanism assembly 33 operates, the turntable 34 fixed to the spindle shaft 43 moves upward, the disk 20 is centered, and the disc 20 is clamped on the turntable 34 by the clamper 35.

Thereafter, the turntable motor 36 is started, the CD-ROM 20 is rotated, and the optical head 37 reproduces the data.

The disk clamp device 30 has a turntable 34 and a clamper 35 as shown in FIG.

As shown in FIG. 2, the turntable 34 is a disk-shaped iron plate 39 formed by outsert molding, and an annular protective rubber 40 is attached to an outer peripheral portion of the iron plate 39. And a center hub 34b made of synthetic resin. Center hub 34
An annular concave portion 34c is formed inside b. 39
a is an inner peripheral portion of the iron plate 39 and is exposed at the bottom 34c-1 of the concave portion 34c.

Reference numeral 41 denotes a ring-shaped permanent magnet for generating a clamping force, which is assembled into the annular concave portion 34c in a state of being in close contact with and magnetically attracting to the inner peripheral portion 39a of the iron plate 39.

Therefore, there is no need to apply an adhesive for fixing the permanent magnet 41, and it is sufficient to simply fit the permanent magnet 41 into the annular concave portion 34c. Can be easily manufactured.

The inner peripheral portion 39a of the iron plate 39 functions as a back yoke for the permanent magnet 41.

Thus, in FIG. 1, of the upper and lower sides of the permanent magnet 41, the magnetic force on the upper side opposite to the iron plate 39 is:
This is considerably strengthened as compared with the case where the iron plate 39 is not provided.

[0026] Therefore, the permanent magnet 41, in comparison with the thickness t ₁ of the permanent magnet 15 built into a conventional clamping mechanism 10 shown in FIG. 5, the magnetic force of the upward strengthened by the back yoke portion 39a It is thinner by t ₂ (<
t ₁ ). Therefore, the permanent magnet 41 is
The size is smaller than that of the middle permanent magnet 15, and the cost is correspondingly lower.

The clamper 35 has the same structure as the clamper 13 in FIG. 5, and has an iron plate portion 35a having a central relationship and a surrounding synthetic resin body portion 35b .

The clamper 35 includes a top plate 42 of the case 42.
a is loosely fitted and supported on a clamper supporting portion 42b formed at the position a.

In the state shown in FIGS. 1 and 2, the disk 30 rests on the disk support portion 34a with the center hole fitted in the center hub portion 34b and centered.

The clamper 35, the steel plate portion 35a is attracted magnetically by the permanent magnet 41 and is biased by the force F in the arrow Z ₁ direction.

The disk 20 is mounted on the main body 3 of the clamper 35.
By 5b, it is pressed and clamped by the force F on the support portion 42b.

The disk 20 is rotated in this state, and is reproduced by the optical head 27 (see FIG. 2).

In the clamped state, as shown in FIG. 1, there is a gap between the iron plate portion 35a of the clamper 35 and the permanent magnet 41, and the magnetic attraction between the permanent magnet 41 and the clamper 35 is permanent. The magnetic attraction between the magnet 41 and the turntable 34 is weaker.

For this reason, the permanent magnet 41 is simply magnetically attracted to the turntable 34, but when the clamp is released, the permanent magnet 41 is securely turned on the turntable 3.
It is left on the 4th side.

FIG. 3 shows a disk clamp mechanism 50 according to another embodiment of the present invention.

The mechanism 50 has a configuration in which an iron plate is used only as a back yoke.

In FIG. 3, the same components as those shown in FIG. 1 are denoted by the same reference numerals, and description thereof will be omitted.

The turntable 51 has a structure in which an annular iron plate 52 is insert-molded, and has a disk support portion 51a made of synthetic resin and a center hub portion 51b also made of synthetic resin.

The inner peripheral side of the center hub portion 51b is an annular recess 5
1c.

The annular iron plate 52 is exposed at the bottom 51c-1 of the annular recess 51c.

The permanent magnet 41 is simply fitted into the annular concave portion 51c, and is attached by being magnetically attracted to the iron plate 52.

With the permanent magnet 41 attached, the iron plate 52 functions as a back yoke for the permanent magnet 41.

The disk 20 is clamped on the turntable 51 by the clamper 35, similarly to the mechanism 30 shown in FIG.

The present invention is not limited to a CD-ROM,
The present invention can be similarly applied to a clamp for a CD, an optical disk, a magneto-optical disk, and a magnetic disk.

[0045]

[Effects of the Invention] As described above, according to the present invention,
In order to assemble the permanent magnets, it is sufficient to simply fit them in the recesses, and it is not necessary to apply an adhesive, so that the manufacture of the turntable can be performed more easily than in the past.

Further, since the metal disk functions as a back yoke for the permanent magnet, if the clamping force is the same as the conventional one, the permanent magnet can be made smaller than in the conventional case, and as a result, the cost is lower than in the conventional case. Thus, a simple permanent magnet can be used, and the disk clamp mechanism can be made less expensive than the conventional one. The disk support is
It is composed of a part that protrudes outside the
Therefore, compared to the case where the disc support is made of synthetic resin,
As a result, the mechanical strength of the disk support can be increased,
Also, the disk support is made of a special metal disk.
The number of parts can be reduced as compared with the conventional structure.

[Brief description of the drawings]

FIG. 1 is a diagram showing a disk clamp device according to an embodiment of the present invention.

FIG. 2 is a diagram showing a turntable taken out of FIG. 1;

FIG. 3 is a view illustrating a C to which the disc clamp device of FIG. 1 is applied;
It is a figure showing a D-ROM device.

FIG. 4 is a diagram showing a disk clamp device according to another embodiment of the present invention.

FIG. 5 is a diagram showing a conventional example.

[Explanation of symbols]

 Reference Signs List 20 disk 20a center hole 30, 50 disk clamp mechanism 31 CD-ROM device 32 tray 33 mechanism assembly 34, 51 turntable 34a, 51a disk support 34b, 51b center hub 34c, 51c annular recess 34c-1, 51c-1 Bottom 35 clamper 36 turntable motor 37 optical head 39 disc-shaped iron plate 39a inner peripheral side portion (back yoke) 40 protective rubber 41 permanent magnet 42 case 42a top plate portion 42b clamper support portion 52 annular iron plate (back yoke)

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) G11B 17/022-17/035 G11B 19/20

Claims (1)

(57) [Scope of request for utility model registration] 1. A disk having a permanent magnet incorporated therein,
And Turn-down table for supporting, are attracted to the turntable by the magnetic force of the permanent magnet, the disc clamp device having a clamper for clamping the disc on the turntable, the turntable comprises a ferromagnetic metal disk Made of synthetic resin
An outsert molded product comprising a center hub portion, wherein the metal disc is exposed inside the center hub portion.
Inner part where the permanent magnet is magnetically attracted
And protrudes outward from the center hub, and
A disk clamp mechanism comprising a disk support portion for supporting a disk .