JP2003162858A - Cartridge type recording medium and disk drive device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To obtain a miniaturized and thin disk drive deice by chucking the center part of a recording medium without moving a cartridge type recording medium to the pivotal direction of the recording medium. <P>SOLUTION: The cartridge type recording medium 21 is moved in the direction of an arrow C orthogonally crossing the direction of a pivot of an optical disk 22, and the cartridge type recording medium 21 is inserted in the disk drive device. With this insertion, a center hub 24 of the optical disk 22 moves while contacting with a contact surface 11a of a turntable 11, and the half of circumferential side surface of the center hub 24 fits to the inside of a step 11b. In this state, a movement of the center hub 24 of the optical disk 22 is limited by the contact surface 11a and the step 11b of the turntable 11, and a center hub 24 is adsorbed on the step 11b and the contact surface 11a by first and second permanent magnets 15, 16 for chucking. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cartridge type recording medium in which a disc-shaped recording medium is rotatably housed in a cartridge, and a disc drive device for rotationally driving the recording medium.

[0002]

2. Description of the Related Art As a cartridge type recording medium of this type, there is one which accommodates a recording medium such as a flexible disk or an optical disk. In a disk drive device that rotationally drives such a cartridge-type recording medium, the cartridge-type recording medium is inserted in a direction orthogonal to the rotation axis direction of the recording medium, and the inserted cartridge-type recording medium is rotated in the rotation axis direction of the recording medium. To the center of the recording medium on the turntable built in the device,
After this, the recording medium was rotationally driven together with the turntable.

On the other hand, in recent years, there is an increasing demand for downsizing and thinning of disk drive devices. However, as described above, in order to move the cartridge type recording medium in the direction of the rotation axis of the recording medium in the apparatus, it is necessary to secure a sufficient space in the apparatus, and the apparatus becomes thick. I couldn't meet.

Therefore, for example, as shown in FIG. 6, the flexible disk 102 in the cartridge type recording medium 101 is used.
A center hub 103 made of a magnetic material is provided at the center of the center hub 103, and a recess 103a is formed in the center hub 103.
Further, a convex portion 104a is formed on the turntable 104 on the side of the disk drive, and the magnet 105 is embedded in the convex portion 104a.
03 is attracted by the magnet 105 of the turntable 104, the convex portion 104a of the turntable 104 is fitted into the concave portion 103a of the center hub 103, and thereby the flexible disk 102 is chucked (special feature). (See Japanese Laid-Open Patent Publication No. 2001-93270).

A space is provided between the flexible disk 102 and the inner wall of the cartridge 106 in order to cope with the surface wobbling of the flexible disk 102, and the flexible disk 102 has flexibility.
The flexible disk 102 can be moved in the cartridge 106 in the rotation axis direction. Focusing on this point, only the flexible disk 102 is moved in the rotation axis direction without moving the cartridge type recording medium 101 itself in the rotation axis direction.
I'm chucking 02.

As described above, if it is not necessary to move the cartridge type recording medium 101 itself in the rotation axis direction, it is not necessary to secure a space in the apparatus, and the apparatus can be made smaller and thinner.

[0007]

However, the structure of the conventional cartridge type recording medium cannot be directly applied to the optical disk. This is because even if there is a space between the optical disc and the inner wall of the cartridge that allows surface wobbling of the optical disc, it is difficult to move only the optical disc in the cartridge in the rotation axis direction because the optical disc is hard. is there.

Therefore, for a cartridge type recording medium containing an optical disc, the cartridge type recording medium is inserted in the direction perpendicular to the rotation axis direction of the recording medium, and then the cartridge type recording medium is moved in the rotation axis direction of the recording medium. It was necessary to move the recording medium and place the center of the recording medium on the turntable for chucking, and it was not possible to meet the demands for downsizing and thinning of the disk drive device.

Therefore, the present invention has been made in view of the above conventional problems, and an object of the present invention is to provide a cartridge type recording medium capable of realizing a compact and thin disk drive device.

Further, according to the present invention, regardless of whether or not the recording medium is hard, the center of the recording medium is chucked without moving the cartridge type recording medium in the rotation axis direction of the recording medium. It is an object of the present invention to provide a disk drive device capable of performing the above.

[0011]

In order to solve the above problems, the present invention relates to a cartridge type recording medium in which a disk type recording medium is rotatably housed in a cartridge. A cylindrical center hub made of a magnetic material is projectingly provided, an opening is formed in the center of the cartridge, and the recording medium is held in a state where the center hub of the recording medium is projected from the opening of the cartridge. ing.

According to the cartridge type recording medium of the present invention having such a structure, a cylindrical center hub made of a magnetic material is provided at the center of rotation of the recording medium, and the center hub is provided at the center of the cartridge through the opening. The recording medium is held in the projected state. Therefore, as will be described later, the center hub protruding at the rotation center of the recording medium can be chucked only by moving the cartridge type recording medium in the direction orthogonal to the rotation axis direction of the recording medium.

Further, according to the present invention, the cartridge type recording medium is inserted into the recording medium in a direction orthogonal to the rotation axis direction of the recording medium, and the cylindrical center hub is made of a magnetic material and is provided so as to project at the rotation center of the recording medium. In a disk drive device for removably chucking the recording medium and rotating the recording medium, an abutting portion that abuts the tip of the center hub of the inserted cartridge type recording medium and a projecting portion around the corresponding abutting portion. And a turntable having a semi-cylindrical step portion that fits around the side surface of the center hub, a first chucking magnet embedded in the step portion of the turntable, and a contact portion of the turntable. When the second chucking magnet and the cartridge type recording medium are inserted, the step portion of the turntable is brought into contact with the cartridge type recording medium through the contact portion. And a rotational position adjustment means for adjusting the rotational position of the turntable so as to face the center hub.

According to the disk drive device of the present invention having such a configuration, when the cartridge type recording medium is inserted in the direction orthogonal to the rotation axis direction of the recording medium, the tip of the center hub of the inserted cartridge type recording medium is shown. Contacts the contact portion of the turntable, and the side surface half circumference of the center hub fits into the semicylindrical step portion of the turntable. In this state, the movement of the center hub in the rotation axis direction of the recording medium is limited by the contact portion, the movement of the center hub in the direction orthogonal to the rotation axis direction of the recording medium is limited by the step portion, and the center hub is further reduced. Is attracted to the step portion and the contact portion by the first chucking magnet of the step portion and the second chucking magnet of the contact portion. As a result, the center hub is chucked on the turntable. Therefore, even if the cartridge type recording medium or the recording medium is not moved in the rotation axis direction, the center hub of the recording medium is chucked only by inserting the cartridge type recording medium in the direction orthogonal to the rotation axis direction of the recording medium. be able to.
Further, when the cartridge type recording medium is inserted, the rotational position adjusting means adjusts the rotational position of the turntable, and the stepped portion of the turntable is opposed to the center hub via the contact portion. If the cartridge type recording medium is inserted in the direction orthogonal to the rotation axis direction of the recording medium in this state, the center hub of the recording medium is guided to the stepped portion through the contact portion, and the tip of the center hub contacts. Abut the
Half of the side surface of the center hub fits into the step.

Further, in the present invention, the center of gravity of the second chucking magnet is displaced from the center of the turntable on a straight line connecting the center of the step of the turntable and the center of the turntable. Is set.

The semi-cylindrical step portion of the turntable is formed off the center of the turntable. For this reason,
The center of gravity of the turntable deviates from the center of rotation. Therefore, the center of gravity of the turntable is adjusted appropriately by setting the center of gravity of the second chucking magnet on a straight line connecting the center of the step of the turntable and the center of the turntable. Match the center of rotation. If the turntable is rotated at a high speed while the center of gravity of the turntable remains deviated from the center of rotation, vibrations may occur and the life of the turntable may be shortened.

Further, in the present invention, when the cartridge type recording medium is inserted, the cartridge of the cartridge type recording medium is temporarily held until the half circumference of the side surface of the center hub of the cartridge type recording medium fits into the stepped portion of the turntable. Introduced, after which the cartridge is pushed back into a preset position.

An extra space is provided between the recording medium and the cartridge, which causes rattling. Therefore, until the side half circumference of the center hub fits in the stepped portion of the turntable, the cartridge is first introduced and then the cartridge is pushed back to the preset position, which ensures that the center hub is fitted in the stepped portion. And the cartridge is arranged at a predetermined position.

Further, in the present invention, the rotational position adjusting means holds the turntable at the preset rotational position by attracting the first chucking magnet embedded in the stepped portion of the turntable. It includes magnetic force generating means.

By thus attracting the first chucking magnet on the stepped portion of the turntable by the magnetic force generating means, the turntable is stopped so that the distance between the magnetic force generating means and the first chucking magnet becomes the shortest. Then, the turntable is held at a predetermined rotation position.

Further, in the present invention, guide portions are provided at both ends of the semicylindrical step portion of the turntable so as to smoothly guide the side half circumference of the center hub of the cartridge type recording medium to the inside of the step portion.

By the guide portions at both ends of the semi-cylindrical step portion, it becomes possible to smoothly guide the side half circumference of the center hub of the cartridge type recording medium to the inside of the step portion.

[0023]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

FIG. 1 is a sectional view showing an embodiment of a cartridge type recording medium and a disk drive device of the present invention. FIG. 2 is a plan view showing a turntable of the disk drive device of this embodiment.

Here, only the turntable 11 of the disk drive device, the motor 12 for rotationally driving the turntable 11, the electromagnetic coil 13 for setting the turntable 11 to a preset rotational position, and the cartridge positioning spring 14 are provided. Is shown. Turntable 1
Reference numeral 1 has a flat contact surface 11a and a semi-cylindrical stepped portion 11b provided around the contact surface 11a so as to project half around.
Further, the first chucking magnet 15 is embedded in the inner peripheral surface of the semi-cylindrical step portion 11b, and the second chucking magnet 16 is embedded in the contact surface 11a.

Semi-cylindrical step portion 1 of turntable 11
1b is provided apart from the center of rotation of the turntable 11. Therefore, the center of gravity of the turntable 11 deviates from the center of rotation. Further, the specific gravity of the material of the turntable 11 and the specific gravity of the magnet are different from each other. Therefore, the center point of the step 11b and the turntable 1
The center of gravity B of the second chucking magnet 16 is appropriately positioned on the straight line A connecting the center of rotation of No. 1 so that the center of gravity of the turntable 11 coincides with the center of rotation.
For example, if the specific gravity of the second chucking magnet 16 is larger than the specific gravity of the material of the turntable 11, the second
Set the center of gravity B of the chucking magnet 16 to the step 11
If the specific gravity of the second chucking magnet 16 is smaller than the specific gravity of the material of the turntable 11, the center of gravity B of the second chucking magnet 16 is set to the center point of the stepped portion 11b. Get closer. In this way, if the center of gravity of the turntable 11 and the center of rotation are made to coincide with each other, vibration does not occur when the turntable 11 rotates at high speed, and the life of the motor 12 does not decrease.

The cartridge type recording medium 21 has a hard optical disk 22 housed in a cartridge 23. A center hub 24 made of a magnetic material is fixed to the center of the optical disk 22.
The lower end side of is formed in a cylindrical shape. This center hub 2
The optical disk 22 is rotatably held in the cartridge in a state in which 4 is projected from the opening 23 a of the cartridge 23.

Next, the procedure for inserting the cartridge type recording medium 21 into the disk drive device 11 and mounting it will be described.

First, before inserting the cartridge type recording medium 21, the motor 12 is driven for a short time while the electromagnetic coil 13 is excited to rotate the turntable 11. For example, the turntable 1 is rotated at a rotation speed such that the turntable 11 can make one rotation due to its inertial force.
Rotate 1. When the inertial force is rotated, the first chucking magnet 15 is attracted by the electromagnetic force of the electromagnetic coil 13. Therefore, when the first chucking magnet 15 comes closest to the electromagnetic coil 13, the turntable 11 moves. Stop. With this, turntable 1
The rotational position of 1 is specified, and the stepped portion 11b of the turntable 11 faces the insertion direction of the cartridge-type recording medium 21 via the contact surface 11a.

Thus, the step portion 11 of the turntable 11
After the orientation of b is set, the cartridge type recording medium 21 is moved in the direction of arrow C orthogonal to the rotation axis direction of the optical disc 22, and the cartridge type recording medium 21 is inserted into the disc drive device. With this insertion, the center hub 24 of the optical disk 22 moves while contacting the contact surface 11a of the turntable 11, and the side surface half circumference of the center hub 24 fits inside the stepped portion 11b.

Here, the optical disk 22 and the cartridge 2
Rattling is provided between the three. Therefore, as shown in FIG. 3, the cartridge 23 is pushed in until the cartridge positioning spring 14 is pressed by the tip of the cartridge 23, the edge of the opening 23a of the cartridge 23 is abutted against the center hub 24, and the center hub 24 is removed. The step portion 11b is securely fitted. After this, when the cartridge type recording medium 21 is released, the cartridge 23 is pushed back by the cartridge positioning spring 14 to a preset position as shown in FIG.

In this state, the movement of the center hub 24 of the optical disk 22 is restricted by the contact surface 11a and the step portion 11b of the turntable 11, and the center hub 24
Is attracted to the step portion 11b and the contact surface 11a by the first and second chucking magnets 15 and 16. As a result, the center hub 24 of the optical disk 22 is chucked on the turntable 11, and the motor 12 can rotate the optical disk 22.

On the other hand, when the cartridge type recording medium 21 is removed from the disk drive device, the motor 12 is also driven for a short time, and the first force is applied by the electromagnetic force of the electromagnetic coil 13 during the rotation by the inertial force of the turntable 11.
The chucking magnet 15 is attracted to stop the turntable 11 at a predetermined rotation position. Thereafter, the cartridge type recording medium 21 is moved in the direction opposite to the arrow C and taken out from the disk drive device.

As described above, in this embodiment, the center hub 24 of the optical disk 22 is chucked on the turntable 11 only by moving the cartridge type recording medium 21 in the direction of the arrow C orthogonal to the rotation axis direction of the optical disk 22. Can be king. Therefore, the cartridge type recording medium 2
It is not necessary to move either the optical disc 1 or the optical disc 22 in the rotation axis direction, and it is not necessary to provide a space for this in the disc drive device, and the disc drive device can be made smaller and thinner.

Here, in the case of the conventional flexible disk cartridge type recording medium and disk drive device, the surface wobbling amount of the disk is a, and the moving amount by which the disk is moved in the rotation axis direction for chucking is b. Then, since the flexible disk has flexibility, if the surface deflection amount a> the movement amount b, the flexible disc is moved in the rotation axis direction only by securing the surface deflection amount a as a space in the cartridge. Can be chucked. However, in the case of a conventional optical disc cartridge type recording medium and a disc drive device,
Since the optical disc is hard, the optical disc cannot be moved in the rotation axis direction even if only the amount of surface wobbling a is secured as the space in the cartridge, and the amount of (surface wobbling a + movement b) is set as the space. It was necessary to secure the size, and it was impossible to reduce the size and thickness of the disk drive device.

On the other hand, in the case of the cartridge type recording medium 21 and the disc drive device of this embodiment, both the cartridge type recording medium 21 and the optical disc 22 need to be moved in the rotation axis direction as described above. Since it does not exist, the movement amount b can be omitted, and the disk drive device can be made smaller and thinner.

The present invention is not limited to the above embodiment, but can be variously modified. For example,
With the turntable 11 stopped at a predetermined rotation position by the electromagnetic force of the electromagnetic coil 13, the turntable 11
Is locked, the lock is held when the power of the disk drive device is turned off and until the cartridge type recording medium 21 is inserted, and the lock is released when the power is turned on and the cartridge type recording medium 21 is inserted. May be. As a result, it is not necessary to frequently repeat the rotation position adjustment of the turntable 11, and the cartridge type recording medium 21 can be taken in and out even when the power of the disk drive device is turned off. Further, instead of the electromagnetic coil 13, a magnet is applied, and this magnet is brought close to the turntable 11 to attract the first chucking magnet 15, and the turntable 11 is stopped and locked. The lock may be released by moving away from the turntable 11.

Further, as shown in FIG. 5, the turntable 11
A curved surface may be formed at both ends 11c of the stepped portion 11b so that the center hub 24 of the optical disk 22 can be smoothly introduced into the stepped portion 11b.

[0039]

As described above, according to the present invention, when the cartridge type recording medium is inserted in the direction perpendicular to the rotation axis direction of the recording medium, the tip of the center hub of the inserted cartridge type recording medium turns. It abuts on the abutting portion of the table, and the side surface half circumference of the center hub fits into the semicylindrical step portion of the turntable. In this state, the movement of the center hub in the rotation axis direction of the recording medium is limited by the contact portion, the movement of the center hub in the direction orthogonal to the rotation axis direction of the recording medium is limited by the step portion, and the center hub is further reduced. Is attracted to the step portion and the contact portion by the first chucking magnet of the step portion and the second chucking magnet of the contact portion. As a result, the center hub is chucked on the turntable. Therefore, even if the cartridge type recording medium or the recording medium is not moved in the rotation axis direction, the center hub of the recording medium is chucked only by inserting the cartridge type recording medium in the direction orthogonal to the rotation axis direction of the recording medium. be able to. Further, when the cartridge type recording medium is inserted, the rotational position adjusting means adjusts the rotational position of the turntable, and the stepped portion of the turntable is opposed to the center hub via the contact portion. If the cartridge type recording medium is inserted in the direction orthogonal to the rotation axis direction of the recording medium in this state, the center hub of the recording medium is guided to the stepped portion through the contact portion, and the tip of the center hub contacts. The side hub half of the center hub is fitted to the step portion. Therefore, it is not necessary to move either the cartridge type recording medium or the recording medium in the rotation axis direction, and it is not necessary to provide a space for this in the disk drive device, and the size and thickness of the disk drive device can be reduced. .

Further, according to the present invention, the turntable is appropriately set on the straight line connecting the center point of the step portion of the turntable and the center point of the turntable, thereby setting the center of gravity of the second chucking magnet appropriately. Since the center of gravity of is properly adjusted to match the center of rotation of the turntable, it is possible to prevent generation of vibrations and reduction of life due to high-speed rotation of the turntable.

Further, according to the present invention, the cartridge is once introduced until the half circumference of the side surface of the center hub is fitted to the stepped portion of the turntable, and then the cartridge is pushed back to the preset position. The hub can be securely fitted to the step portion, and the cartridge can be arranged at a predetermined position.

Further, according to the present invention, since the magnetic force generating means attracts the first chucking magnet on the stepped portion of the turntable, the distance between the magnetic force generating means and the first chucking magnet is shortest. The turntable is stopped so that the turntable is held at a predetermined rotation position.

Further, according to the present invention, since the guide portions are provided at both ends of the semi-cylindrical step portion of the turntable, the side half circumference of the center hub of the cartridge type recording medium is smoothly moved to the inside of the step portion. I can guide you.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing an embodiment of a cartridge type recording medium and a disk drive device of the present invention.

FIG. 2 is a plan view showing a turntable of the disk drive device according to the present embodiment.

FIG. 3 is a diagram showing a process of inserting a cartridge type recording medium into a disc drive device in the present embodiment.

FIG. 4 is a diagram showing a state in which a cartridge type recording medium is inserted into a disk drive device in the present embodiment.

FIG. 5 is a plan view showing a modification of the turntable shown in FIG.

FIG. 6 is a cross-sectional view illustrating a conventional cartridge type recording medium and disk drive device.

[Explanation of symbols]

11 turntable 12 motors 13 Electromagnetic coil 14 Positioning spring 15 First chucking magnet 16 Second chucking magnet 21 Cartridge type recording medium 22 Optical disc 23 cartridges 24 Center hub

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Mitsuo Ishii             22-22 Nagaikecho, Abeno-ku, Osaka-shi, Osaka             Inside the company F term (reference) 5D046 AA16 CA14 DA08 EB08 HA06                 5D138 RA05 RA08 RA15 TA06 TA24

Claims (6)

[Claims] 1. A cartridge-type recording medium in which a disk-shaped recording medium is rotatably housed in a cartridge, wherein a cylindrical center hub made of a magnetic material is provided at the center of rotation of the disk-shaped recording medium so as to project. A cartridge type recording medium which holds the recording medium in a state in which an opening is formed in the center of the recording medium and a center hub of the recording medium is projected from the opening of the cartridge. 2. The cartridge type recording medium according to claim 1, which is inserted in a direction orthogonal to a rotation axis direction of the recording medium,
A cylindrical center hub made of a magnetic material and protruding from the center of rotation of the recording medium is detachably chucked,
In a disk drive device for rotationally driving the recording medium, an abutting portion that abuts on a tip of a center hub of an inserted cartridge type recording medium, and a half circumference around the abutting portion of the abutting portion are provided on a side half circumference of the center hub. A turntable having a semi-cylindrical step portion to be fitted, a first chucking magnet embedded in the step portion of the turntable, and a second chucking magnet embedded in the contact portion of the turntable, And a rotational position adjusting means for adjusting the rotational position of the turntable so that the step portion of the turntable faces the center hub of the cartridge type recording medium via the contact portion when the cartridge type recording medium is inserted. Disk drive device characterized by. 3. The center of gravity of the second chucking magnet is set on a straight line connecting the center point of the step portion of the turntable and the center point of the turntable, and is displaced from the center point of the turntable. The disk drive device according to claim 2, wherein 4. When inserting a cartridge type recording medium,
A feature is that the cartridge of the cartridge type recording medium is once introduced until the side half circumference of the center hub of the cartridge type recording medium fits into the stepped portion of the turntable, and then the cartridge is pushed back to a preset position. The disk drive device according to claim 2. 5. The rotational position adjusting means includes magnetic force generating means for holding the turntable at a preset rotational position by attracting the first chucking magnet embedded in the stepped portion of the turntable. The disk drive device according to claim 2, wherein: 6. A guide part is provided at both ends of a semi-cylindrical step portion of the turntable, the guide portion smoothly guiding a half circumference of a side surface of the center hub of the cartridge type recording medium to the inside of the step portion. 2. The disk drive device described in 2.