JP2001184825A - Disk cartridge - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the deterioration in the double refraction and the degradation in the quality of a disk substrate and the many manhours required for assembly which occur in the use of an adhesion method and resin deformation method for fixing a clamping plate to the disk substrate. SOLUTION: A disk-like medium 2 having a center hole 2a is housed in a disk cartridge body consisting of a disk cartridge upper cap 1a and lower cap 1b and a disk clamping member 3 having a magnetic material in at least part for clamping the disk-like medium 2 on a turntable 6 on a disk device side is arranged in the disk cartridge body movably in a radial direction of the disk-like medium 2. In addition, a position regulating part 1e for regulating the movement in the radial direction of the disk clamping member 3 is formed at the disk cartridge upper cap 1a.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disk cartridge for rotatably storing a disk-shaped medium such as an optical disk, a magneto-optical disk, and a magnetic disk.

[0002]

2. Description of the Related Art Generally, an optical disk, a magneto-optical disk, a magnetic disk or the like is housed in a case, and these disks are used as a disk cartridge including the case. FIG. 9 is a sectional view showing a conventional disk cartridge. In FIG. 9, a disk cartridge 101 includes an upper lid 101a and a lower lid 101b, and a disk substrate 10 which is a disk-shaped disk medium therein.
2 are stored. On the disk substrate 102, a clamping plate support portion 102a is circumferentially provided at the center portion so as to protrude downward with respect to the disk substrate 102.
A center hole 102c is formed therein. Further, a clamping plate 103 made of a magnetic material such as a soft magnetic material is fixed or loosely attached to the upper portion of the support portion 102a by an adhesive method or a resin deformation method.

FIG. 10 shows a disc cartridge 10 shown in FIG.
FIG. 2 is a cross-sectional view showing a state in which 1 is mounted on a disk device. In FIG. 10, first, the disk cartridge 10
One disk substrate 102 is magnetically held on a turntable 104 via a holder (not shown) of the disk device. The turntable 104 is the disk substrate 10
2 is formed on the rotor of a spindle motor 105 for rotating
Is arranged. Reference numeral 107 denotes a stator of the spindle motor 105. When the disk substrate 102 is magnetically held on the turntable 104, the disk substrate 102
The conical inclined surface of the turntable 104 abuts the center hole 102 c of the disk substrate 10, the clamping plate 103 is attracted downward by the attraction force of the magnet 106, and
2 is configured to be securely supported on the disk support surface.

[0004]

By the way, in the above-mentioned conventional disk cartridge, the clamping plate 10
An adhesive method or a resin deformation method is used for fixing or loosely attaching 3 to the disk substrate 102. However, when such an adhesive method or a resin deformation method is used, the heat is applied, the birefringence of the disk substrate is deteriorated, the quality is reduced, and the number of assembly steps is increased, so that the cost of the disk cartridge increases. There was a problem. In addition, there is a problem that the moldability is deteriorated due to the presence of the clamping plate support portion 102a.

SUMMARY OF THE INVENTION An object of the present invention is to provide a disk cartridge which solves the above-mentioned conventional problems, does not deteriorate the birefringence of a disk-shaped medium, and enables a stable clamping operation.

[0006]

SUMMARY OF THE INVENTION It is an object of the present invention to store a disk-shaped medium having a center hole in a disk cartridge body comprising a disk cartridge upper lid and a disk cartridge lower lid, and to store the disk-shaped medium in a disk drive. A disk clamp member having a magnetic material at least in part for clamping on the turntable on the side is disposed in the disk cartridge body so as to be movable in the radial direction of the disk-shaped medium, and Is achieved by a disk cartridge characterized by forming a position restricting portion for restricting the radial movement of the disk clamp member.

[0007]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a sectional view showing the configuration of the first embodiment of the disk cartridge of the present invention. In FIG. 1, the disc cartridge 1 has a structure in which a disc cartridge upper cover 1a and a cartridge lower cover 1b are overlapped, and a pair of upper and lower cartridge upper covers 1a and lower covers 1b constitute a disc cartridge main body. A disk-shaped medium 2 as a recording medium is rotatably housed in a space in the disk cartridge body. Examples of the disk-shaped medium 2 include an optical disk, a magneto-optical disk, and a magnetic disk. The disk-shaped medium 2 has a flat plate shape on both sides, and a center hole 2a is formed in the center. Also, a center hole 2 in the space between the cartridge upper lid 1a and the disc-shaped medium 2 is provided.
The disk clamp member 3 is arranged at a position above “a”.

Since the disk clamp member 3 is merely placed in the space between the cartridge upper lid 1a and the disk-shaped medium 2, the disk clamp member 3 is movable in the radial direction and the vertical direction of the disk-shaped medium 2. . The disk clamp member 3 includes a ring-shaped resin portion formed along the outer peripheral portion of the center hole 2a and in contact with the disk-shaped medium 2 or the cartridge upper lid 1a, and a magnetic material such as a soft magnetic material fixed to the resin portion. It is composed of a circular clamping plate 4 made of a material. The clamping plate 4 is used to clamp (magnetically hold) the disk-shaped medium 2 to a turntable of a disk device.

Here, a recess is formed in the center of the cartridge upper lid 1a in a downward circular shape, and the radial movement of the disc clamp member 3 is regulated by the inner peripheral surface of the recess. This will be described later in detail. An opening 1c for inserting a recording magnetic head (not shown) is formed in the upper cover 1a of the disk cartridge, and an optical pickup (not shown) is formed in the lower cover 1b of the cartridge.
An opening 1d for inserting the hole is formed. These openings 1c and 1d are opened or closed by the opening and closing operation of the shutter 5. That is, the shutter 5 is opened according to the operation of inserting the disk cartridge 1 into the disk device (not shown), and the shutter 5 is closed according to the operation of removing the disk cartridge 1 from the disk device.

FIG. 2 is a sectional view showing a state where the disk cartridge 1 of FIG. 1 is mounted on a disk device. In FIG. 2, the disk-shaped medium 2 is supported on a turntable 6 via a holder (not shown) by a magnetic holding action of a disk clamp member 3. In FIG. 2, the shutter 5 is not shown because it is open. The turntable 6 is formed on a rotor 7 of a spindle motor for rotating the disk-shaped medium 2, and a magnet 8 is disposed at the center of the turntable 6. 9 is a stator of the spindle motor.

The support structure of the disk-shaped medium 2 will be described. First, the center hole 2a of the disk-shaped medium 2 comes into contact with the conical inclined surface of the turntable 6, and
a is centered. The conical inclined surface of the turntable 6 abuts the conical hole of the disc clamp member 3, and the clamping plate 4
Is sucked downward, so that the disk-shaped medium 2 is reliably supported on the disk support surface. At this time, the disk-shaped medium 2 has a center hole 2a and a turntable 6 inscribed therein.
Is positioned.

The disk clamp member 3 does not require much positioning accuracy, and is positioned roughly by the inclined portion of the disk clamp member 3 and the inclined portion of the turntable 6 so that the eccentricity does not cause a problem in the rotation of the disk-shaped medium 2. . Since the disk-shaped medium 2 is flat, the disk supporting surface of the turntable 6 is at the same height as the lower surface of the disk-shaped medium 2, and the spindle motor can be inserted deeper into the disk cartridge 1 as compared with the related art. Become.

FIG. 3 is a partially enlarged view showing the disk support of FIG. 2 in an enlarged manner. In FIG. 3, first, projections 1 f and 1 f are formed on the cartridge upper lid 1 a and the lower lid 1 b toward the disk medium 2 so that the recording surface of the disk medium 2 does not directly interfere with the disk cartridge 1. The protrusions 1f, 1f are formed on the inner peripheral side of the recording surface of the disk-shaped medium 2, and the upper and lower lids 1a and 1b of the cartridge abut on portions other than the recording surface of the disk-shaped medium 2. It is possible to protect the recording surface. As described above, the cartridge upper lid 1a is formed with a concave portion facing downward, and the inner peripheral surface of the concave portion is formed as a position restricting portion 1e for restricting the radial movement of the disk clamp member 3. When the disk-shaped medium 2 is supported by the turntable 6, a gap A is maintained between the outer peripheral portion of the disk clamp member 3 and the position regulating portion 1e.

Here, as shown in FIG. 3, the gap between the disk-shaped medium 2 and the projection 1f of the cartridge lower lid 1b is B,
Assuming that the overlap length between the disc clamp member 3 and the position regulating portion 1e of the cartridge upper lid 1a is C, C>
B is set. Therefore, the disk clamp member 3 does not come off even when the disk-shaped medium 2 is in contact with the cartridge lower lid 1b. In the center of the clamping plate 4, the disk-shaped medium 2 is placed.
A spherical projection 4a is formed so as to protrude upward at a position facing the rotation center. By forming the spherical projections 4a in this manner, even when the disk clamp member 3 rotates while contacting the cartridge upper lid 1a, the spherical projection 4a of the disk clamp member 3 contacts the inner wall surface of the cartridge upper lid 1a. Thus, the disk-shaped medium 2 can rotate stably without causing a large load.

In this embodiment, the cartridge upper cover 1a and the disk-shaped medium 2
Disk clamp member 3 having a magnetic material in the space between
When the disk cartridge 1 is mounted on the disk device, the disk-shaped medium 2 is magnetically supported on the turntable 6 by the disk clamp member 3 and the magnet 8. In this support state, the disk clamp member 3 keeps a predetermined distance from the cartridge upper lid 1a, and rotates integrally with the disk-shaped medium 2 by driving the spindle motor.

The disk clamp member 3 may be integrally formed of a magnetic material as described in the second embodiment. Further, it is desirable to form the spherical projection 4a on the disk clamp member 3 as described above. This spherical projection 4a
Is not limited to the disk clamp member 3, but may be formed so as to protrude downward at a position facing the rotation center of the disk-shaped medium 2 of the cartridge upper lid 1a. Further, the position regulating unit 1 having a predetermined distance from the disc clamp member 3.
e is formed on the upper cover 1a of the cartridge to restrict the movement of the disk clamp member 3 in the radial direction. Position regulation part 1
As e, as described in the third embodiment, a through hole may be formed in the cartridge upper lid 1a to restrict the movement of the disk clamp member 3 in the radial direction. Further, in this case, it is desirable to open and close the through hole with a shutter.

In this embodiment, the cartridge upper cover 1a of the disk cartridge 1 and the disk-shaped medium 2
Since the disk clamp member 3 is movably arranged in the space between them, the assemblability is good and parts can be manufactured at low cost. Further, since there is no need to attach the clamping plate by deforming the resin on the disk-shaped medium 2, the birefringence of the disk-shaped medium 2 is not deteriorated, and the deterioration of the quality can be prevented. Further, since there is no clamping plate support and the disk-shaped medium is flat, not only the moldability is improved, but also the spindle motor can be inserted deeper into the disk cartridge than in the prior art. In particular, this has the effect that the disk device can be made thinner.

When the disk cartridge 1 is mounted on the disk device and the disk medium 2 is actually rotated, the disk clamp member 3 is attached to the cartridge upper cover 1.
a and the disc-shaped medium 2 is rotated integrally with the disc-shaped medium 2 at a predetermined interval from the position regulating portion 1e, so that the disc clamp member 3 does not hinder the rotating operation of the disc-shaped medium 2 at all. 2 can perform a stable rotation operation. Further, although the disk clamp member 3 is movable, the movement of the disk clamp member 3 is restricted by the position restricting portion 1e even when the disk clamp member 3 is movable. It can be easily mounted on a disk device.

FIG. 4 is a sectional view showing a second embodiment of the disk cartridge of the present invention. 4 and FIG.
The same parts as in FIG. In this embodiment,
As shown in FIG. 4, only the structure of the disc clamp member is different from the first embodiment shown in FIGS. That is,
The disk clamp member 10 is made of a magnetic material such as a soft magnetic material, and a portion that contacts the disk-shaped medium 2 and a portion that is attracted by the magnet 8 are integrally formed by press working.
A spherical projection 10a is formed at the center of the disk clamp member 10 in contact with the cartridge upper lid 1a, as in the first embodiment. In this embodiment, since the disk clamp member 3 is integrally formed of a magnetic material such as a soft magnetic material, a disk cartridge can be manufactured at low cost.

FIG. 5 is a sectional view showing the structure of the third embodiment of the present invention. 5 and FIG. 2 of the first embodiment.
The same parts as in FIG. In FIG. 5, a hole 11 is formed in the cartridge upper lid 1a as a position restricting portion 1e of the disk clamp member 3. 1st, 2nd
In the embodiment, the concave portion is formed downward in the cartridge upper lid 1a, and the inner peripheral surface of the concave portion is used as the position regulating portion 1e. In the present embodiment, as shown in FIG. A hole 11 is formed, and its inner peripheral surface is used as a position restricting portion 1e. The hole 11 is configured to be openable and closable by the shutter 5 as described later.
Other structures are the same as those of the first embodiment shown in FIG.

FIG. 6 is a sectional view showing a state where the disk cartridge 1 of FIG. 5 is mounted on a disk device. Also in this case, the disk-shaped medium 2 is placed on the turntable 6 in the same manner as in the first embodiment shown in FIGS.
Are supported by the magnetic holding action of

FIG. 7 is a perspective view showing the appearance of the disk cartridge 1 shown in FIG. FIG. 7A is the front side, and FIG.
Is a perspective view from the back side. FIG. 7 shows the shutter 5
In a closed state. The shutter 5 opens and closes the openings 1c and 1d as described with reference to FIG.
In the present embodiment, since the hole 11 is opened and closed in addition to the opening, the opening and closing space is wider than that of FIGS. In FIG. 7, the cartridge lid 1
The label affixing section 12 is provided on a, and the positioning reference holes 13a and 13b and the detection hole 14 are provided on the cartridge lower lid 1b. The detection hole 14 is used for determining whether or not information can be written and for determining the type. Further, a slide groove 15 of the shutter 5 is provided on a side surface of the disc cartridge 1.
Is provided.

FIG. 8 is a perspective view showing an appearance of the disk cartridge 1 shown in FIG. In this case, the state where the shutter 5 is open is shown. FIG. 8A shows the front side, and FIG.
(B) is a perspective view from the back side. The shutter 5 is configured to be openable and closable along the slide groove 15. That is, an opening / closing mechanism (not shown) is provided on the disk device side, and the shutter 5 slides and opens according to the operation of inserting the disk cartridge 1 into the disk device, and the operation of taking out the disk cartridge 1 from the disk device. The shutter 5 is configured to slide and close accordingly. When the shutter 5 is opened, an opening 1c and a hole 11 can be seen on the front side of the disc cartridge 1, and the opening 1c
The disk-shaped medium 2 is exposed, and the disk clamp member 3 is exposed in the hole 11. Similarly, the disk-shaped medium 2 is exposed from the opening 1d on the back side of the disk cartridge 1.

In this embodiment, the hole 11 is formed in the cartridge upper lid 1a in the shape of a through hole as described above, and the inner peripheral surface of the hole 11 is used as the position regulating portion 1e. In addition, the moldability of the cartridge upper lid 1a can be stabilized without worrying about the thickness of the resin of the cartridge upper lid 1a. Further, by opening and closing the hole 11 by using the shutter 5, dustproofness can be secured, and dust and the like can be prevented from entering the inside of the disk cartridge 1.

[0025]

As described above, the present invention has the following effects. (1) Since the disk clamp member having a magnetic material is movably disposed in the space between the cartridge upper cover and the disk-shaped medium, not only can it be easily assembled and manufactured at low cost, but also the bonding method and the resin deformation method can be used. Since the clamping plate is not fixed to or loosely attached to the disk-shaped medium by using a method such as described above, the birefringence of the disk-shaped medium is not deteriorated, and a high-quality disk-shaped medium can be provided. (2) Since there is no clamping plate support and both sides of the disk-shaped medium are flat, the formability can be improved.
Moreover, since the spindle motor can be inserted deeper into the disk cartridge than before, it can greatly contribute to the reduction in thickness of the disk device. (3) When the disk cartridge is mounted on the disk device and the disk medium is actually rotated, the disk clamp member rotates integrally with the disk medium while maintaining a predetermined distance from the cartridge upper cover. Can rotate stably. (4) By forming a spherical projection at a position facing the center of rotation of either the disk clamp member or the cartridge upper lid, even when the disk clamp member rotates in contact with the cartridge upper lid,
The disk-shaped medium can rotate stably without a large load. (5) By integrally forming the disk clamp member with a magnetic material, a disk cartridge can be manufactured at a lower cost. (6) By forming a position restricting portion for restricting the radial movement of the disc clamp member in the shape of a through hole in the cartridge upper lid, the formability can be stabilized without considering the thickness of the cartridge upper lid, and Dustproofness can be secured by opening and closing the through hole with a shutter.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a configuration of a first embodiment of a disk cartridge of the present invention.

FIG. 2 is a sectional view showing a state where the disk cartridge of the embodiment of FIG. 1 is mounted on a disk device.

FIG. 3 is a partially enlarged view showing the disk support portion of FIG. 2 in an enlarged manner.

FIG. 4 is a sectional view showing a second embodiment of the disk cartridge of the present invention.

FIG. 5 is a sectional view showing a third embodiment of the disk cartridge of the present invention.

FIG. 6 is a sectional view showing a state where the disk cartridge according to the third embodiment of FIG. 5 is mounted on a disk device.

7 is a perspective view showing an appearance of the disk cartridge of FIG. 5 in a state where a shutter is closed.

8 is a perspective view showing an appearance of the disk cartridge of FIG. 5 in a state where a shutter is opened.

FIG. 9 is a sectional view showing a conventional disk cartridge.

10 is a sectional view showing a state where the disk cartridge of FIG. 9 is mounted on a disk device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Disc cartridge 1a Disc cartridge upper lid 1b Disc cartridge lower lid 1c, 1d Opening 1e Position regulation part 1f Projection part 2 Disc-shaped medium 2a Center hole 3 Disc clamp member 4 Glamping plate 4a Spherical projection part 5 Shutter 6 Turntable 7 Rotor 8 Magnet 9 Stator 11 hole

Claims (9)

[Claims] 1. A disk-shaped medium having a center hole is housed in a disk cartridge body including a disk cartridge upper lid and a disk cartridge lower lid,
For clamping the disk-shaped medium on a turntable on the disk device side, a disk clamp member having a magnetic material at least in part is disposed in the disk cartridge body so as to be movable in the radial direction of the disk-shaped medium, A disc cartridge, wherein a position regulating portion for regulating a radial movement of the disc clamp member is formed on the disc cartridge upper cover. 2. The disk cartridge according to claim 1, wherein the disk-shaped medium has a flat surface on both sides. 3. The disk cartridge according to claim 1, wherein the disk clamp member is disposed between the disk-shaped medium and a disk cartridge upper cover. 4. The disk cartridge according to claim 1, wherein the disk clamp member keeps a predetermined distance from the upper cover of the cartridge and rotates integrally with the disk-shaped medium. 5. The disk cartridge according to claim 1, wherein the disk clamp member is formed integrally from a magnetic material. 6. The disk cartridge according to claim 1, wherein a spherical projection is formed at a position of one of the disk clamp member and the cartridge lid facing a rotation center of the disk-shaped medium. . 7. The cartridge upper lid has a recess formed downward, and an inner peripheral surface of the recess is formed as a position regulating portion for regulating movement of the disc clamp member in a radial direction. The disk cartridge according to claim 1, wherein 8. A hole is formed in the cartridge upper lid in a shape of a through hole, and an inner peripheral surface of the hole is formed as a position restricting portion for restricting movement of the disk clamp member in a radial direction. The disk cartridge according to claim 1, wherein: 9. The disk cartridge according to claim 8, wherein a through-hole formed in the cartridge upper lid is opened and closed by a shutter.