JP2002222575A - Disk cartridge - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a disk cartridge which houses a small-diameter optical disk, is small in size and is highly portable. SOLUTION: The disk cartridge which rotatably houses the optical disk has a spot facing portion 20 formed to a shape recessing from other segments on the inside surface on the side opposite to a side to be inserted with a rotational drive shaft of the optical disk so as to face a center hub of the optical disk.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a small and portable disk cartridge for storing a small-diameter optical disk.

[0002]

2. Description of the Related Art Conventionally, CDs (compact disks), MDs (mini disks), and DVDs (digital versatile disks) have been widely used as optical disks. Each of them has a read-only type and a recordable type, and the recordable type includes a type that allows only additional recording and a type that can be rewritten.

[0003] Audio data which is not compressed and compressed video and audio data are recorded on the CD. In MD and DVD, compressed image data and audio data are mainly recorded.

[0004] Optical discs such as CDs and DVDs are often used mainly for reproduction only, and generally reproduce a predetermined data arrangement as it is. Also,
In the recordable type CD-R write-once type, special processing is required to edit recorded data because it cannot be rewritten, and many are used for small-scale production of CDs or duplication of CDs. There is a CD-RW as a type that can be repeatedly recorded, but since the number of repetitions is limited,
It was difficult to freely edit the recorded data.

[0005] Both CD and DVD have a diameter of 120.
mm or 80 mm, and a device capable of recording or recording using these as a recording medium has a large size and is inferior in portability as compared with a device using a 4 mm-width magnetic tape as a recording medium. Things.

On the other hand, MD has a feature that the disk size is small (diameter 64 mm) and the number of repetitions is practically unlimited, but a format for keeping the linear velocity, which is the relative velocity between the recording head and the medium, constant. It is not suitable for high-speed access because the number of rotations of the disk changes depending on the radial position. Also, the storage density is the same as that of a CD, and the disk diameter is reduced, so the storage capacity is small, Large amounts of data cannot be stored continuously.

[0007]

The access to an optical disk is faster than that of a take-up type storage device such as a tape, so that the recorded data is not played back in order, but in response to a user's request. Data can be rearranged at high speed.

However, since the conventional optical disk has a large disk size, if a conventional disk is used for the storage device, the size of the disk becomes large and the portability is poor, so that there is a problem that the range of use is limited.

Also, if the disk diameter is reduced to give priority to portability, there is another problem that the storage capacity becomes insufficient and sufficient data cannot be recorded.

If the number of times of repetitive recording is limited, free editing functions are limited, and it has been difficult to increase the added value of data.

An object of the present invention is to solve the above-mentioned problems, and an object of the present invention is to provide a small and highly portable disk cartridge for storing a small-diameter optical disk.

[0012]

According to the present invention, there is provided a disk cartridge for rotatably storing an optical disk, the disk cartridge being opposed to a center hub of the optical disk and opposite to a side into which a rotation drive shaft of the optical disk is inserted. It has a counterbore formed on the inner surface on the side thereof so as to be more concave than other portions.

Further, the disk cartridge of the present invention comprises:
The cartridge includes an upper cartridge, a lower cartridge, and a shutter portion, and a guide portion of the shutter portion vertically sandwiches the upper cartridge.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The disk cartridge of the present invention will be described below in the order of an optical disk to be stored and a disk cartridge.

Optical disk to be stored The optical disk has a diameter of 64 m to improve portability.
m and a thickness smaller than 0.8 mm. Desirably, the diameter is preferably about 50 mm so that a recording / reproducing apparatus (or information terminal device or the like) for recording / reproducing the optical disk as a recording medium can be carried in a pocket.

The recording capacity is set to be larger than 650 MB (megabyte) so that image information can be sufficiently recorded. Desirably, 4
The recording capacity is preferably about 1.0 GB (gigabyte) or more so that about five minutes (at 3.3 Mbps) of image information can be recorded.

A specific example will be described with reference to FIGS. The optical disc 11 of this example has a diameter of 50.8 mm, and a center hub 12 for centering is provided at the center. The hole provided in the center hub 12 has a diameter of 2.
6 mm. The center hub 12 is made of a magnetic material, and can be fixed to a drive-side spindle with a magnet. This optical disc 11 has a data wavelength of 650 nm.
Is recorded / reproduced by the light beam.

The center hub 12 is, as shown in FIG.
The outer diameter is 11.0 mm (D1) and the inner diameter is 2.0 mm (d).
2). The step is 0.5 mm.

The thickness of the optical disk 11 is 0.5 mm. By reducing the disk thickness in this way, it is possible to reduce the size and suppress the occurrence of aberration.

The optical disk 11 is provided with a groove having a depth of 45 ± 15 nm and a width of 0.52 μm. The groove pitch (distance between the center of the groove and the center of the groove) is 1.04 μm, and data is recorded also on the land portion between the grooves.

The information recording area has a radius of 12.02-2.
This is a position of 3.29 mm.

The address information is recorded by meandering one side of the groove side wall. That is, in the address information recording portion, recording is performed by meandering only one of the two opposing side walls.

According to the optical disk having such a configuration, data of about 1 GB can be recorded, and the data can be reproduced with high quality.

Disc Cartridge In order to improve portability, the present disc cartridge (hereinafter simply referred to as a cartridge) is desirably formed with an outer shape smaller than a 65 mm square and a thickness smaller than 5 mm.

A specific example will be described below with reference to FIGS. FIG. 3 is a (a) plan view of the cartridge closed state,
(B) a bottom view, (c) a view in the direction of the arrow C, (d) a view in the direction of the arrow D, (e) a view in the direction of the arrow E, and FIG. Figure, (c) C direction arrow view,
(D) Cross-sectional view in the direction D, FIG.
FIG. 7 shows a perspective view of the cartridge (on the light incident side), and FIG. 7 shows a perspective view of the cartridge (on the light incident side).

The size of the cartridge of this embodiment is 58 mm
(L1) × 54 mm (L2) × 4 mm (L3).

The cartridge comprises a shell 3 serving as a case for protecting the disk, a read / write head and a shutter 4 for opening and closing an opening for accessing a rotary drive shaft. A mounting position 5, a cartridge positioning hole 6, and a notch 7 for loading are provided.

The side of the cartridge to be inserted into the recording / reproducing device (disk drive) (the direction A in the drawing).
On the side where the shutter 4 is formed, a notch 10 is provided so as not to interfere with the disk. This notch is
2mm (L6) width and 27.5mm length (taper 6
mm (L4) + straight part 21.5 mm (L5)). Thereby, the magnetic head arm for writing (attachment (root) portion of the arm to the recording / reproducing device)
Can be arranged closer to the disk (on the B direction side than the maximum insertion position of the recording / reproducing apparatus for the disk in the A direction). That is, it is possible to arrange the magnetic head arm for writing even to the inside of the rectangle containing the disk. Thereby, the size of the recording / reproducing device can be reduced. Here, an example in which the mounting portion of the write magnetic head arm to the recording / reproducing device is arranged in the notch portion is described. It does not matter.

The opening is made as large as 16.5 mm (L7) × 40 mm (L8) so that the optical pickup can access the inside of the cartridge. The drive shaft insertion opening has a diameter of 14 mm (D3). In order to avoid interference between the head arm and the cartridge wall as much as possible on the magnetic head side, the width is 16.5 mm.
It has an opening (L9) × length 22 mm (L10).

As a result, when viewed from the optical pickup, the aperture is large and not only the objective lens but also the actuator housing can be accessed in the cartridge. Although the addition was necessary, the use of this cartridge can greatly contribute to the reduction in the thickness of the apparatus only at the portion where the two overlap.

In the cartridge sectional view of FIG. 5, a taper-shaped rib that comes into contact with the center hub recess is protruded from the inner surface of the cartridge facing the tip of the rotary drive shaft of the apparatus, and has a shape capable of engaging with the recess of the center hub. Has become. The inner diameter of the rib is φ4.3 mm (D4) and the outer diameter is φ6.
4 mm (D6) from φ5.4 mm (D5) to φ6.4 m
m (D6) forms a linear tapered portion. A plane between D4 and D5 is a horizontal plane. At this time, the rib height from the cartridge surface is 0.5 mm (T
1). Further, a counterbore 20 is provided on the inner peripheral side of the rib, and even when the length of the rotary drive shaft is long to some extent, the tip does not contact the cartridge surface. The height from the top of the rib to the counterbore is 0.85 mm (T2), and the counterbore depth is 0.35 mm (T2-T
1).

-1. Next, an example of a shutter opening / closing mechanism in the above-described cartridge will be described in detail.

FIG. 8A is a plan view showing one embodiment of the present invention.
8 (b) is a side view, FIG. 8 (c) is a rear view showing an embodiment of the present invention, FIG. 9 (a) is a plan view (shutter opening view) showing the embodiment, FIG. 9B is a side view (shutter opening view) showing the embodiment, FIG. 9C is a rear view (shutter opening view) showing the embodiment, and FIG.
FIG. 11A is a sectional view taken along the line AA, and FIG. 11 is a sectional view taken along the line B-A in FIG.
B and FIG. 12 are perspective views (a shutter and a shielding area of the second opening), FIG. 13 is a layout view of the second opening and the actuator, and FIG. 14A is a case where the cartridge of the cartridge holder is inserted. Shutter opening / closing diagram (initial insertion), FIG. 14
FIG. 14B is a drawing in the middle of the insertion, FIG. 14C is a drawing showing the end of the insertion, FIG. 15A is a plan view of the magneto-optical recording / reproducing apparatus,
FIG. 15B is a side view of the magneto-optical recording / reproducing apparatus.
(C) shows a back view of the magneto-optical recording / reproducing apparatus. 8 to 11 and 15, the cartridge 102 includes an upper cartridge 103, a lower cartridge 105, a shutter 108, a lock lever 118, and the like. In the cartridge 102, a magneto-optical disk 101 on which information signals are recorded is provided. , Rotatably housed. The upper cartridge 103 has a first opening 104 facing a magnetic head 125 for recording or reproducing information signals, and the lower cartridge 105 has a spindle motor 126 for rotating and holding the magneto-optical disk 101 and a recording or reproducing information signal. It has a second opening 106 facing the pickup unit 127 to be operated. Then, the entire cartridge 102 is mounted on the magneto-optical recording / reproducing device 123 shown in FIG. 15 to record and reproduce information.

An elongated space 116 is provided in a portion of the side surface of the cartridge 102 between the upper and lower cartridges 103 and 105, through which a release member 121 for releasing a lock lever 118 described later passes.

The shutter 108 includes upper and lower shutter portions 1 for shielding the first and second openings 104 and 106.
09, a vertical portion 110 connecting the upper and lower shutter portions 109, two jaws 111 for opening and closing, and a guide portion 112 for preventing the jaws 111 from coming off, and a lock lever 118 to be described later. Hole 11 into which an open lever 120 for opening and closing a shutter 108, which will be described later, is opened.
5 is provided.

The claw 111 slides in a guide groove 114 provided in the upper cartridge 103, and regulates the position in the direction perpendicular to the moving direction of the shutter 108 by the vertical portion 110, and also prevents and holds the shutter 108 from coming off. ing. Further, the upper cartridge 103 is vertically sandwiched by the guide portion 112 of the shutter portion 109 to prevent the shutter 108 from coming off and to hold the shutter 108.

The guide groove 114 may be provided on any surface of the upper cartridge 103. In this embodiment, the guide groove 114 on the insertion side is located above the upper cartridge 103, and the guide groove 114 on the rear side is located between the lower cartridge 105. Is provided on the upper cartridge 103 side in the space 116 provided on the side surface. Since the guide groove is provided in the space between the upper and lower cartridges in this manner, the guide groove cannot be seen from the outside in design, and the degree of freedom in design can be increased.

The second opening 10 of the lower cartridge 105
In the conventional example 6, the shielding is performed using one plane of the bottom surface. However, in the present example, as shown by a hatched portion in FIG. 9 or FIG. By performing shielding using two planes of the side surface, the opening can be opened from the bottom surface to the side surface, and the actuator 12 of the pickup unit 127 can be opened.
9 can be arranged close to the magneto-optical disk 101 even at the outer peripheral portion of the magneto-optical disk 101 (see FIG. 13).
The degree of freedom in designing the actuator 129 is increased, and it is possible to obtain a magneto-optical disk device that can be further reduced in size.

Next, the opening and closing operation of the shutter 108 of the cartridge 102 of the present invention will be described with reference to FIG. When the shutter 108 is closed, a lock portion 113 of the shutter 108 is locked by a lock lever 118 disposed inside the upper and lower cartridges 105. When the cartridge 102 is mounted on the apparatus, the cartridge 102 is inserted into the cartridge holder 119. First, the projection of the open lever 120 having a spring property for opening and closing the shutter 108 provided on the cartridge holder 119 is engaged with the shutter 108. The lock lever 118 enters the hole 115 provided in the vertical portion 110, and is then released by the release member 121 provided in the cartridge holder 119.
Then, the shutter 1 is moved by the open lever 120.
08 is fixed at a predetermined position of the cartridge holder 119. Although the main body of the cartridge 102 is inserted into the back by the subsequent pushing operation of the cartridge 102, since the shutter 108 is fixed at that position,
The shutter 108 is relatively opened and closed. When closing, the opposite operation is performed.

In the above description, the lower cartridge 105 is located on the recording surface side of the magneto-optical disk 101, and the upper cartridge 105 is located on the side opposite to the recording surface of the magneto-optical disk 101. It is.

-2. Next, the operation of the cartridge when the cartridge is inserted will be described in detail.

FIG. 16 is an enlarged cross-sectional view of the entire cartridge on the left side and an enlarged view of the center of the cartridge on the right side. In this figure, the rotary shaft, the cartridge holder, the cartridge positioning pins and the like are omitted and simplified.

FIG. 16A shows a state in which the disk 201 of the cartridge 209 is shifted to the end in the horizontal direction, and a state in which the disk 201 is in contact with the lower surface of the inner wall of the cartridge by gravity in the vertical direction. Here, the disc 201 has a center hub 207 having a center hole 206 at the center thereof.
Four. The cartridge 209 has a convex portion 215 on the inner wall of the cartridge opposite to the spindle motor and the disk.
A part of the convex portion 215 is included in a range in which is possible. The shape of the convex portion has a slope that becomes wider toward the outer periphery toward the base. The projections may be in the form of one continuous ring, or may be projections at three or more locations that are independently arranged on the circumference. In this example, a disk having a center hub is described. However, an integrated structure having no center hub and having a concave portion in the center may be used.

Next, the state of FIG. 16B will be described. The disk 201 is pushed up to the upper surface side of the cartridge 209 when the center hub 207 hits the rotation shaft, and the peripheral portion 214a of the center hub is in contact with the inclined portion of the convex portion. In FIG. 16C, the disc 1 is further pushed up, and the disc 1 moves rightward in FIG. 16 along the inclination of the convex portion 215, and is moved to a position where it fits on the rotating shaft 208, and FIG. As shown in ()), the disc is loaded on the motor while being fitted to the rotating shaft 208 of the motor.

Although an example has been shown here, the disk is moved to a position necessary for fitting the disk to the rotating shaft of the spindle motor, and then the disk is stably mounted on the rotating shaft of the spindle motor. What is necessary is just to have the structure which can be performed.

[0046]

As described above, according to the disk cartridge of the present invention, the tip of the drive shaft does not touch the cartridge surface even if the rotary drive shaft is long to some extent.
The rotation drive shaft can be extended without increasing the thickness of the cartridge.

[Brief description of the drawings]

FIG. 1 is a diagram illustrating an embodiment of an optical disc according to the present invention.

FIG. 2 is a view showing an example of a center hub shown in FIG. 1;

FIG. 3 is a plan view of the disk cartridge according to the embodiment of the present invention when a shutter is closed.

FIG. 4 is a plan view of the disk cartridge according to the embodiment of the present invention when a shutter is opened.

FIG. 5 is a sectional view of the disk cartridge shown in FIGS.

FIG. 6 is a front perspective view of the disk cartridge of FIGS.

FIG. 7 is a rear perspective view of the disk cartridge of FIGS.

FIG. 8 is a view for explaining an opening / closing mechanism of a shutter of the disk cartridge (when the shutter is closed).

FIG. 9 is a view for explaining an opening / closing mechanism of a shutter of the disk cartridge (when the shutter is opened).

FIG. 10 is a sectional view taken along line AA of FIG. 9;

FIG. 11 is a sectional view taken along line BB of FIG. 9;

FIG. 12 is a bottom perspective view of the disk cartridge (when the shutter is open).

FIG. 13 is a schematic diagram showing a main part when a disk cartridge is loaded in a recording / reproducing apparatus.

FIG. 14 is a diagram illustrating a shutter opening / closing operation when a disc cartridge is inserted.

FIG. 15 is a diagram showing a configuration of a magneto-optical recording / reproducing apparatus.

FIG. 16 is a diagram illustrating a positional relationship between a disk cartridge and a rotary drive shaft when a disk cartridge is inserted.

[Explanation of symbols]

 REFERENCE SIGNS LIST 3 shell 4 shutter 5 label sticking position 6 positioning hole 7 notch for loading 10 notch 11 disk board 12 center hub 20 countersink

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor ▲ Yoshi ▼ Mitsunobu 22-22, Nagaike-cho, Abeno-ku, Osaka-shi, Osaka Inside (72) Inventor Nobuyuki Usui 22-22, Nagaike-cho, Abeno-ku, Osaka-shi, Osaka No. Sharp Corporation (72) Inventor Tomoyuki Miyake 22-22 Nagaike-cho, Abeno-ku, Osaka-shi, Osaka Prefecture Inside Sharp Corporation (72) Toshiharu Inui 22-22 Nagaike-cho, Abeno-ku, Osaka-shi, Osaka Sharp shares Inside the company (72) Inventor Hideharu Tajima 22-22 Nagaike-cho, Abeno-ku, Osaka-shi, Osaka Inside (72) Inventor Akira Takahashi 22-22 Nagaike-cho, Abeno-ku, Osaka-shi, Osaka

Claims (2)

[Claims] 1. A disk cartridge for rotatably storing an optical disk, comprising: an inner surface opposite to a center hub of the optical disk and opposite to a side into which a rotation drive shaft of the optical disk is inserted; A disc cartridge having a counterbore formed. 2. The disk cartridge according to claim 1, wherein said cartridge comprises an upper cartridge, a lower cartridge, and a shutter portion, and a guide portion of said shutter portion vertically sandwiches said upper cartridge. Disc cartridge.