JP3424268B2 - Optical 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 an optical disk device, and more particularly to a linear motor that moves and positions a read / write head.

In recent years, optical disc devices or magneto-optical disc devices (hereinafter referred to as optical disc devices) are required to be thin, and in particular, read / write which occupies an area of about 1/3 to 1/2 of the device. There is a need to reduce the thickness of the linear motor that positions the head.

[0003]

2. Description of the Related Art A conventional optical disk device will be described in detail with reference to FIGS. FIG. 4 is a plan view showing a schematic structure of a conventional optical disk device, and FIG. 5 is a sectional view showing a detailed structure of a conventional linear motor and a carriage.

As shown in FIG. 4, a schematic structure of a conventional optical disk device is such that a disk holder is provided on a rotary shaft 22a of a spindle motor 22 provided on a base 21 having a base wall 21a on the periphery thereof.
This is an optical disk device in which the disk 22 is fixed and the disk 3 is mounted on the disk holding portion 22b, and data is written in or read from the disk 3 by the read / write head 32 mounted on the carriage 28.

A linear motor for moving the read / write head 32 mounted on the carriage 28 in the radial direction of the disk 3 and stopping it at a predetermined position is mounted on a rail 24 fixed to a rail supporting portion 25 provided on the base 21, and is shown in FIG. The magnet 29 fitted on one side of the carriage 28 as shown in (a) is moved in the direction of the arrow between the two yokes 30 wound with the coil 31 as shown in FIG. 5 (b). , Is to be stopped at a predetermined position.

In this case, since the yoke 30 around which the coil 31 is wound is provided on both sides of the magnet 29, when the yoke 30 is attached to the base 21, the distance H between the surface of the base 21 shown in the figure and the lower coil 31 is about 9 mm. Therefore, the thickness of the optical disk device becomes thicker.

[0007]

In the conventional optical disk device described above, the coil as shown in FIG. 5 (b) is used.
Since the two yokes 30 around which the coil 31 is wound are fixed to the base 21, there is a problem that the distance H between the upper surface of the base 21 and the lower coil 31 is large. Further, although the carriage moves along the rail by the sliding bearing provided on the magnet on one side, there is a problem that it is difficult to move smoothly due to the sliding bearing.

In view of the above situation, the present invention has an object to provide an optical disk device which can reduce the distance between the upper surface of the base and the coil below and can be miniaturized.

[0009]

The optical disk device of the present invention is an optical disk device comprising a spindle motor for driving an optical disk and a linear motor for moving a carriage having a read / write head mounted on a base, wherein > On each side of the ridge , a magnet fixed to the carriage is attached.
A stone is provided, and a linear motor for linearly moving the carriage is provided on each of the both sides, and a front side of each is provided.
Serial Riniamo - data has the base and the magnet made of a material having a yoke and a magnetic coil is wound,
Each of the magnet before and said coil to said base and facing
It is not slidably inserted in the gap with the base .
Ri, and the magnet and the distance between the base, the distance between the <br/> yoke and the magnet are configured differently.

[0010]

That is, according to the present invention, the spindle motor is provided on the base, the disk holding portion is fixed to the rotary shaft of the spindle motor, the disk is mounted on the disk holding portion, and the read / write head for writing or reading data to or from the disk. Is mounted on a carriage, magnets are provided on both sides of this carriage, and each magnet provided on both sides is moved linearly by a linear motor. Since the base made of material is used, the distance between the surface of the base and the surface of the coil wound on the other yoke is the distance between the surface of the coil of the conventional linear motor that uses the coil wound on both sides of the magnet. The distance can be made smaller than the distance, and the optical disc device can be made compact.
Further, the carriage is provided with a guide roller having a V-shaped groove, and the rail provided on the base is sandwiched between the V-shaped groove and the rail spring provided on the base to move the carriage along the rail. The carriage can be smoothly moved along the rails. Further, the coil facing the base and the gap between the magnet and the base, which are slidably sandwiched in the gap between the base and the non-contact, and the gap between the magnet and the yoke around which the coil is wound are different. When the magnet stops, the magnet is attracted toward the side where the space between the base and the yoke is narrow, and the V-shaped groove of the guide roller is pressed against the rail to eliminate the play in the axial direction. It is possible to improve the positioning ability with respect to directional vibration.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described in detail below with reference to FIGS. FIG. 1 is a plan view showing a schematic structure of an optical disk device of an embodiment according to the present invention, FIG. 2 is a sectional view showing a detailed structure of a linear motor and a carriage of an embodiment of the present invention, and FIG. 3 is an embodiment of the present invention. It is sectional drawing which shows the detailed structure of the guide part of an example.

As shown in FIG. 1, a schematic structure of an optical disk device according to an embodiment of the present invention is such that a disk holding portion 2b is fixed to a rotary shaft 2a of a spindle motor 2 provided on a base 1 having a base wall 1a on its periphery. The disk 3 is mounted on the disk holder 2b, and the read / write head 12 mounted on the carriage 8 writes or reads data to or from the disk 3.

A linear motor for moving the read / write head 12 mounted on the carriage 8 in the radial direction of the disk 3 and stopping it at a predetermined position is provided with magnet holders 9a on both sides of the carriage 8 as shown in FIG. 2 (a). Fix the magnet 9
Base 1 made of a conductive material and a yoke 10 around which a coil 11 is wound
The magnet 9 disposed biased to one as shown in FIG. 2 (b), is moved in the direction of the arrow between the base 1 consisting of a yoke 10 and a magnetic material wound with coil 11 between, It stops at a predetermined position.

Since the base 1 made of a magnetic material is used as a substitute for one of the yokes and the coil of the linear motor as described above, the distance h between the surface of the base 1 and the surface of the coil 11 wound on the other yoke 10 can be reduced. Can be about 5.4 mm,
It is possible to reduce the size of the optical disc device.

In this embodiment, a rotatable guide roller 6 is provided on both sides of the lower portion of the carriage 8 as shown in FIG. 3, and a rail 4 fixed to a V-shaped groove by a rail support portion 5 provided on the base 1. Since the rail springs 7 whose both ends are fixed to the base 1 are provided so that they come into contact with each other, the carriage 8
Can smoothly go straight along the rail 4.

Further, as shown in FIG. 2 (b), a magnet 9 is used as a base.
1 is arranged so that the distance from the magnet 1 is small, the magnet 9 is attracted toward the base 1 when the magnet 9 is moved and then stopped (that is, the magnet 9 is attracted upward in the drawing).
As shown in FIG. 3, since the V-shaped groove of the guide roller 6 is pressed against the rail 4 to eliminate the play in the axial direction, the positioning ability with respect to the vertical vibration is improved.

[0017]

As is apparent from the above description, according to the present invention, there is an advantage that the linear motor can be downsized by an extremely simple structure change, and a remarkable economic effect can be expected. It is possible to provide an optical disk device.

[Brief description of drawings]

FIG. 1 is a plan view showing a schematic structure of an optical disc device according to an embodiment of the present invention.

FIG. 2 is a sectional view showing a detailed structure of a linear motor and a carriage according to an embodiment of the present invention.

FIG. 3 is a cross-sectional view showing a detailed structure of a guide portion according to an embodiment of the present invention.

FIG. 4 is a plan view showing a schematic structure of a conventional optical disc device.

FIG. 5 is a sectional view showing a detailed structure of a conventional linear motor and carriage.

[Explanation of symbols]

1 base 1a base wall 2 spindle motor 2a rotary axis 2b disc support 3 discs 4 rails 5 Rail support 6 Guide roller 7 Rail spring 8 carriage 9 magnets 9a magnet holder 10 York 11 coils 12 read / write head

Continuation of the front page (56) Reference JP-A-4-243069 (JP, A) JP-A-3-93074 (JP, A) Actually opened 62-22768 (JP, U) Actually opened 55-170879 (JP , U) (58) Fields investigated (Int.Cl. ⁷ , DB name) G11B 21/02 G11B 7/085 H02K 41/02

Claims (2)

(57) [Claims] 1. A disc device provided with a linear motor for moving the carriage equipped with a spindle motor and read-write head to drive the optical disc on the base, to each of both sides of the carriage fixed to said carriage
And a linear motor for linearly moving the carriage is provided on each of the two sides .
Each of said Riniamo - data has the base and the magnet made of a material having a yoke and magnetic <br/> of the coil is wound
And which, each of said magnets slidably sandwiched is in a non-contact in a gap between the base and the coil of the base facing
The optical disk device is characterized in that the distance between the magnet and the base and the distance between the magnet and the yoke are different. 2. The optical disk apparatus according to claim 1, wherein the carriage comprises a guide roller having a V-shaped groove, and a rail provided on the base is provided between the V-shaped groove and a rail spring provided on the base. An optical disk device, wherein the optical disk device is sandwiched and the carriage is moved along the rail.