JP3042507B2 - Disk cartridge - 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 cartridge containing a disk-shaped recording medium such as an optical disk and a magneto-optical disk.

[0002]

2. Description of the Related Art Conventionally, disks such as optical disks have been used as disk-shaped recording media. These discs are often used by being enclosed in a disc cartridge in order to prevent hand oils, dirt, and the like from adhering to the recording surface.

[0003] By the way, if the disk-shaped recording medium has the same recording density, a disk having a larger diameter naturally has a larger recording capacity. However, when a disk-shaped recording medium is used as a recording medium for a portable recording / reproducing apparatus, for example, a video camera, a small disk is often used because a small disk is more excellent in portability. . For this reason, the discs of the portable device and the discs of the stationary device may have different sizes. At this time, a small disk cartridge is used for the portable disk.

In the case where the recording method is the same and only the shape of the disk is different, if a small disk can be mounted on the recording / reproducing apparatus, it is possible to record / reproduce even with a recording / reproducing apparatus for a large disk. Therefore, it is conceivable that the small disk is recorded and reproduced by the stationary recording / reproducing apparatus by taking out only the disk from the small disk cartridge and replacing it with a disk cartridge having the same outer shape as the disk cartridge of the stationary apparatus.

An optical disk is sensitive to dirt during recording, but is relatively resistant to dirt during reproduction. Therefore, the disk can be removed from the disk cartridge only when the disk that has been recorded is to be reproduced without recording again. It can be used as a single unit.

For these reasons, there is a demand to insert and remove a disk from a disk cartridge. As a structure to take out the disk from the disk cartridge,
For example, as disclosed in Japanese Patent Application Laid-Open No. 5-242626, there is a method of disposing a disk insertable / removable portion in a part of a disk cartridge.

[0007]

A conventional structure for taking out a disk from a disk cartridge will be described with reference to FIG. At the lower part of the drawing of the disk cartridge 15, a disk insertion / removal opening 20 is provided, in which a disk insertion / removal opening / closing member 18 is arranged. Normally, the disc insertion / removal opening / closing member 18 has a locking claw 17
Is locked with the locking hole 16 arranged in the
0 is closed. When removing the disk 6, the locking pawl 17
To release the locking of the locking claw 17, rotate the disk insertion / removal opening / closing member 18 around the fulcrum 19, open the disk insertion / removal opening 20, and insert / remove the disk 6. In this case, the user directly handles the removed disk 6 by hand.

As a means for moving a disk without directly touching the disk, a moving method using a disk holder has been proposed. In this method, a disk cartridge is composed of parts including a cartridge case and a disk holder, and when moving disks between disk cartridges, the disk is held by the disk holder and the disk is moved together with the disk holder. You no longer need to touch the disc. When the disk is used alone, the disk holder is removed from the cartridge case, and then the disk is removed from the disk holder and used.

As described above, the method of inserting and removing a disk by using the disk holder reduces the chance of the disk becoming dirty,
The usability of the user can be improved. However, in order to realize this, it is necessary to stably hold the disk when the disk holder holds the disk. In addition, the disk holder releases the holding of the disk inside the disk cartridge, and the disk holding unit starts holding the disk when removing the disk holder.
For this reason, when taking out the disk holder, the disk holder must surely hold the disk.

According to the present invention, in a disk cartridge in which a disk is inserted and removed using a disk holder, an appropriate shape of a disk holding portion for the disk holder to stably hold the disk is provided. Further, the present invention provides a structure in which the disk holder reliably holds the disk when the disk holder is removed from the disk cartridge.

[0011]

In order to solve the above-mentioned problems, when a disk holder holds a disk, a plane perpendicular to the plane of the held disk is defined as a width direction of the disk cartridge, the disk holder, and the disk holder. In at least a part of the disk holding portion, the shape of the disk holding portion is determined so that the outer side of the disk holding surface of the disk holding portion when viewed in the width direction is closer to the center axis of the disk.

In addition, the shape of the disk holding portion is determined so that, of the cross-sectional shape of the disk holding portion cut out by a plane perpendicular to the disk holding surface and parallel to the center axis of the disk, the vicinity near the width direction becomes an acute angle.

When the curvature or chamfer amount at the tip of the acute angle portion on the outer side in the width direction of the disk holding portion is X1, and the curvature or chamfer amount at the outer edge portion of the disk is X2, X1 <X2.

When the width of the inner wall in the width direction of the disk cartridge that restricts the movement of the disk is L1, and the width of the disk holding surface of the disk holding unit is L2, L1
<L2.

[0015]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. FIG. 1 is a diagram illustrating the appearance and structure of a disk cartridge according to an embodiment of the present invention.
FIG. 1A shows the external appearance of the disk cartridge 1, and FIG. 1B shows the internal structure of the disk cartridge 1. The outer shape of the disk cartridge 1 is formed by a cartridge case 2 and a disk holder 3. The cartridge case 2 is provided with an opening for accessing the disk 6 for recording / reproducing by the recording / reproducing apparatus. When the disc cartridge 1 is outside the recording / reproducing apparatus, a shutter 21 covers the opening to prevent dust and the like from adhering to the disc 6, and the shutter 21 is attached in a direction to close the opening by shutter springs 9a and 9b. It is being rushed.

A disk holder 3 that is detachable from the cartridge case 2 is disposed at a position opposite to the position where the shutter 21 is disposed. The disk holder 3 has locking claws 4 a and 4 b locked in locking holes 5 a and 5 b provided in the cartridge case 2.
When removing the locking claws 4a, 4b, the locking holes 5a, 5
b. The disk holder 3 has disk holding ends 7a, 7 for holding the disk 6.
b and a disk holding unit 8 are provided. The distance between the disk holding end 7a and the disk holding end 7b is set smaller than the size of the disk 6 so that the disk 6 can be held with the disk holder 3 removed from the cartridge case 2. However, when the disc holder 3 is mounted on the cartridge case 2, the disc holding ends 7 a and 7 b come into contact with the inside of the cartridge case 2,
It is elastically deformed in the direction in which the holding of the disk 6 is released.

FIG. 2 is a view of the cartridge case 2 of the present embodiment with the disk holder 3 removed. When the disk holder 3 is removed, the disk 6 is held by the disk holding ends 7a and 7b and the disk holding portion 8 indicated by dotted lines, and the disk 6 can be handled together with the disk holder 3. In this case, by handling the disk holder 3, the user does not need to directly touch the disk 6, so that fats and oils of hands are not attached.

FIG. 3 shows a state in which the disk holder 3 is removed from the cartridge case 2 of this embodiment.
FIG. 4 is a diagram illustrating a state in which holding of the disk 6 is started. When the disc holder 3 is mounted on the cartridge case 2, the disc holding ends 7 a and 7 b come into contact with the inside of the cartridge case 2 and move in a direction to release the holding of the disc 6. When the disc holder 3 is removed from this state, the disc holding ends 7a and 7b are released from the regulation by the cartridge case 2, move in the direction of the arrow in the drawing by the restoring force, and hold the disc 6.

FIG. 4 is a view for explaining the shape of the disk holding portion of the disk holder 3 of this embodiment. The disk holding ends 7a and 7b and the disk holding part 8 which are hatched are shown in FIG.
The cross-sectional shape of a portion cut off by a dashed line is shown. This corresponds to a cross-sectional shape of the disk holding portion cut by a plane perpendicular to the surface holding the disk 6 and parallel to the center axis of the disk 6. Disk holding ends 7a, 7
The cross-sectional shape of b is such that the outer side from the central part when viewed in the width direction is closer to the central axis of the disk 6. Further, the disk holding portion 8 is also concave, so that the width of the disk 6 can be regulated. The disk holding ends 7a and 7b are disposed beyond a line passing through the center of the disk 6 as viewed from the disk holding unit 8. By arranging the disk holding ends 7a and 7b at this position, the disk holding ends 7a and 7b urge the disk 6 toward the disk holding unit 8 to stably hold the disk.

The details of the disk holding end of this embodiment will be described with reference to FIG. Since the disk holding end 7b has a shape symmetrical to the disk holding end 7a, the disk holding end 7a will be described here. FIG. 5A is an enlarged view of the disk holding end 7a, and FIG. 5B is a view as viewed from the X direction in FIG. 5A. As shown in FIG. 5B, the shape of the disk holding end 7a is such that the outer side from the center is closer to the center axis of the disk 6 when viewed in the width direction. Regulations. In order to realize this, the disk holding end 7a
The outside has a sharp angle.

The cross-sectional shape of the disk holding end is shown in FIGS.
In addition to the V-shape as shown in the above, any shape may be used as long as the disc 6 can be regulated in the width direction and held stably. FIG. 6 shows an example of the cross-sectional shape of the disk holding end. FIG. 6A shows the V shape shown in FIGS. FIG. 6B shows FIG.
In contrast to (a), a U-shaped groove is provided at the center.
FIG. 6 (c) is different from FIG. 6 (a) in that the vicinity of the center is parallel to the center axis of the disk. FIG. 6D shows a disk holding surface formed of a curved surface. FIG. 6E shows a disk holding surface formed of a curved surface, with the vicinity of the center parallel to the center axis of the disk. These shapes are
The outer side of the disk holding end is determined to be closer to the disk center axis than to the center. Due to these shapes, the disk 6 is held at the disk holding ends 7a, 7c, 7d, 7
e, 7f are regulated near the center.

By the way, when removing the disk holder 3 from the cartridge case 2, the disk holding end 7a,
7b starts holding the disk 6. A shape for securely holding the disk 6 at this time will be described with reference to FIGS. FIG. 7 is a cross-sectional view of the disk cartridge 1 in the width direction, and shows a state in which the disk holding end 7a has released the holding of the disk 6 and a state in which the holding of the disk 6 is started. FIGS. 7A and 7B show the case where the edge of the disk holding end 7a and the edge of the disk 6 have curvature, and FIGS. 7C and 7D show the edge of the disk holding end 7a and the edge of the disk 6. Shows the case where there is a chamfer. FIGS. 7A and 7C show a state in which the holding of the disk 6 is released, and FIGS.
(D) shows a state where the holding of the disk 6 is started.

In this embodiment, the edge of the disk holding end 7a and the edge of the disk 6 are a combination of curvature and curvature, or a combination of chamfer and chamfer. However, the present invention is not limited to this, and the same applies to a combination of curvature and chamfer. FIG. 8 is a diagram for explaining the cause of the failure of holding the disk 6 by the disk holding end 7a. Here, since the disk holding end 7b has a shape symmetrical to the disk holding end 7a, the disk holding end 7a will be described. The outer edges 13a, 13b, 13c, 13d of the disk holding end 7a are acute, but strictly speaking, the tip has a small curvature or is chamfered.

The outer peripheral edge 14a of the disk 6
Similarly, 14b, 14c and 14d also have a minute curvature or chamfer. At this time, the disc holding end edge 13a,
13b, 13c, 13d, the curvature or chamfer amount is X
1, outer peripheral edge 14a, 14b, 14 of disk 6
When the curvature or chamfer amount of c and 14d is X2,
The disc holding end edge 13 is set so that X1 <X2.
a, 13b, 13c, 13d and the outer peripheral edges 14a, 14b, 14c, 14d of the disk 6 are determined. Inside the disc cartridge 1, the disc 6 may be present in contact with the wall surface of the cartridge case 2 as shown in FIGS. In this case, in order to hold the disk 6, the curvature or chamfer of the disk holding edge 13a, 13b, 13c, 13d is determined by adjusting the outer peripheral edge 14a, 14b, 1 of the disk 6.
4c and 14d are made smaller than the curvature or the chamfer amount.
In this way, when the disk holding end 7a moves in the direction of the disk 6, the disk holding end 7a scoops up the disk 6 as shown in FIGS. 7 (b) and 7 (d), and moves to the center of the disk holding end 7a. The disk 6 can be moved.

If the curvature or chamfer of the edge of the disk holding end is larger than the curvature or chamfer of the outer peripheral edge of the disk 6, the holding of the disk 6 may fail at worst. FIG. 8 shows a state in which the curvature or the amount of chamfer of the disk holding end edges 22a and 22b is larger than the outer peripheral edges 23a and 23b of the disk 6. In this case, as shown in FIG. 8, the disk holding end edges 22a and 22b come into contact with the outer peripheral portion of the disk 6,
The disk 6 cannot be picked up. If the disk holder 3 is taken out in this state, the disk 6 is not regulated in the width direction, so that the disk 6 falls off the disk holder 3 and causes the disk 6 to be scratched or stained.

Referring to FIG. 9, another embodiment in which the disk holding end 7a holds the disk 6 will be described. Inside the cartridge case 2, there is provided an internal gap for the disk 6 to be rotatable. The moving range of the disk 6 in the width direction is limited by the inner wall surface of the cartridge case 2. Therefore, as shown in FIG. 9 (a), the disc 6 is fixed on the wall surfaces 24a and 24b of the cartridge case 2.
Is limited to L1, and the wall surfaces 24a and 24b of the cartridge case 2 are configured such that L1 <L2 with respect to the width L2 of the disk holding end 7a.

It should be noted that the disk holding end 7a is
In order to move the disc holding end 7a, a relief portion is provided so as to move the disc holding end 7a.

By configuring the inside of the cartridge case 2 as described above, when the holding of the disk 6 is started, the disk holding end 7a scoops up the disk 6 as shown in FIG. The disk 6 can be moved to the center of 7a.

Incidentally, the disk holder of the present embodiment has a structure in which the disk holding portion and the locking claw are deformed in the elastic region. The disk holder can be integrally molded of resin to reduce the number of parts and reduce the cost. At this time, the holding portion and the locking claw of the disk holder may be handled by determining the thickness and size of the portion from the required disk holding force and the amount of deformation.

[0030]

According to the above configuration, in a disk cartridge in which a disk is inserted and removed using a disk holder, an appropriate shape of the disk holding portion is provided, and the disk holder can stably hold the disk. Also,
When the disk holder is removed from the disk cartridge, the disk holder starts holding the disk. At this time, the disk can be reliably held.

[Brief description of the drawings]

FIG. 1 is a view showing one embodiment of the present invention, and is a view showing the appearance and structure of a disk cartridge.

FIG. 2 is a view showing one embodiment of the present invention, and shows a state where a disk holder is removed from a disk cartridge.

FIG. 3 is a view showing one embodiment of the present invention, and showing a state in which a disk holder is removed from a disk cartridge.

FIG. 4 is a view showing one embodiment of the present invention, and is a view showing a shape of a disk holder.

FIG. 5 is a view showing one embodiment of the present invention, and is a view showing a shape of a disk holding end of a disk holder.

FIG. 6 is a view showing an embodiment of the present invention, and is a view showing a sectional shape of a disk holding end of a disk holder.

FIG. 7 is a view showing one embodiment of the present invention, and shows a state where the disk holding end portion starts holding the disk when the disk holder is removed from the disk cartridge.

FIG. 8 is a diagram for explaining the cause of failure of holding when the disk holding end starts holding the disk.

FIG. 9 is a view showing one embodiment of the present invention, and shows a state where the disk holding end portion starts holding the disk when the disk holder is removed from the disk cartridge.

FIG. 10 is a diagram illustrating a conventional disk cartridge having a disk insertion / removal opening for disk replacement.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Disk cartridge, 2 ... Cartridge case, 3 ... Disk holder, 4a, 4b ... Locking claw, 5a, 5b ... Locking hole, 6 ... Disk, 7a, 7b, 7c, 7d, 7e ... Disk holding end part, Reference numeral 8 denotes a disk holder, 9a, 9b: a shutter spring, 10: a shutter slider, 13a, 13b, 13c, 13d: a disk holding end edge shape, 14a, 14b, 14c, 14d: a disk edge shape, 15: a conventional disk cartridge, 16: locking hole, 17: locking claw, 18: disk opening / closing member, 19: fulcrum, 20: disk insertion / removal, 21: shutter, 22a, 22b: disk holding end edge shape, 23a, 23b: disk Edge shape, 24a, 24b ... inner wall surface of cartridge case.

──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Hiroaki Ono 292 Yoshida-cho, Totsuka-ku, Yokohama-shi, Kanagawa Prefecture Inside the Multimedia Systems Development Division of Hitachi, Ltd. (72) Inventor Atsushi Inoue Yoshida, Totsuka-ku, Yokohama, Kanagawa 292 Hitachi, Ltd. Multimedia System Development Division, Hitachi, Ltd. (72) Inventor Kenji Sano 292 Yoshida-cho, Totsuka-ku, Yokohama, Kanagawa, Japan Multimedia System Development Division of Hitachi, Ltd. (56) References Special Kaihei 10-188516 (JP, A) (58) Field surveyed (Int. Cl. ⁷ , DB name) G11B 23/03

Claims (5)

(57) [Claims] 1. A disk cartridge containing a disk-shaped recording medium, wherein the disk cartridge has a cartridge case and a disk holder, the disk holder is detachable from the cartridge case, and the disk holder is a disk holder. The disk holding member has a pair of disk holding ends for holding the outer periphery of the recording medium inside the cartridge case from the center of the recording medium, and when the disk holder is removed from the cartridge case, the disk A holding unit holds the recording medium, and the recording medium is detachable from the cartridge case together with the disk holder, and a direction perpendicular to a plane of the held recording medium is a disk cartridge, the disk holder, and the disk holding unit. Width direction and Then, in at least a part of the disk holding part, when the recording medium holding surface of the disk holding part is viewed in the width direction, parts on both outer sides from a center part are close to a center axis of the recording medium. A disk cartridge wherein the shape of the disk holding portion is determined. 2. The disk cartridge according to claim 1, wherein the cross-sectional shape of the disk holding portion cut by a plane perpendicular to the recording medium holding surface and parallel to a central axis of the recording medium has an acute angle near the width direction. A disk cartridge characterized in that the shape of the disk holding portion is determined so as to be as follows. 3. The disk cartridge according to claim 2, wherein the curvature or chamfer amount at the tip of the acute angle portion on the outer side in the width direction of the disk holding portion is X1, and the curvature or chamfer amount at the edge portion of the outer peripheral portion of the recording medium is X2. X1 <X
2. A disk cartridge according to item 2. 4. The disk cartridge according to claim 1, the width limiting the movement of the recording medium inside wall surface in the width direction of the disk cartridge L1, the recording medium holding surface width of the disk holding unit When L2, L1 <
A disc cartridge characterized by L2. 5. The disk cartridge according to claim 1, wherein said disk holder is integrally formed of a resin material.