JP3510615B2 - 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 compact and highly portable disc cartridge that accommodates an optical disc having a small diameter.

[0002]

2. Description of the Related Art Conventionally, CDs (compact discs), MDs (minidiscs) and DVDs (digital versatile discs) have been widely used as optical discs. 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 allows rewriting.

On the CD, uncompressed audio data and compressed video and audio data are recorded. In MD and DVD, mainly compressed image data and audio data are recorded.

Optical discs such as CDs and DVDs are often used mainly for reproduction only, and generally reproduce a predetermined data sequence as it is. Also,
The CD-R write-once type, which is a recordable type, cannot be rewritten and therefore requires special processing to edit recorded data, and is often 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 there is a limit to the number of repetitions, so
It was difficult to freely edit the recorded data.

Both the CD and the DVD have a diameter of 120.
Since the device having a size of 80 mm or 80 mm and capable of recording or recording using these as a recording medium has a larger size and is less portable than a device using a 4 mm wide magnetic tape as a recording medium, the convenience for the user is remarkably lacking. It is a thing.

On the other hand, the MD has a feature that the disk size is small (diameter 64 mm) and the number of repetitions is practically unlimited, but a format that keeps 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 disc changes depending on the radial position. Also, the storage capacity is small because the disc diameter is small while the recording density is the same as that of the CD. It is not possible to save a large amount of data continuously.

[0007]

An optical disc is accessed faster than a roll-up type storage device such as a tape. Therefore, the recorded data is not played back in sequence, but according to a user's request. The feature is that data can be sorted at high speed.

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

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

When the number of repetitive recordings is limited, the free editing function is limited and it is difficult to increase the added value of data.

SUMMARY OF THE INVENTION It is an object of the present invention to solve the above problems and to provide a compact and highly portable disc cartridge for accommodating a small-diameter optical disc.

[0012]

A disk cartridge of the present invention is a disk cartridge provided with an optical disk and a cartridge for rotatably housing the optical disk, wherein the optical disk has a center hub.
Center hub that allows the hub to pass the rotation drive shaft of the optical disk.
And the rotary drive shaft is inserted on the outer peripheral side of this center hole.
With a recess formed on the surface opposite to the side to be inserted,
The cartridge is located inside the recess of the center hub.
On the surface, a counterbore formed in a concave shape from other portions so as to position the tip of the rotary drive shaft in a non-contact manner, and the counterbore of the counterbore.
It protrudes from the outer peripheral side and contacts the recess of the center hub.
Move the optical disk to a position where it can be fitted to the rotary drive shaft
And a taper-shaped rib that allows the tape to be formed .

The disk cartridge of the present invention is
The cartridge is provided with a top cartridge and the bottom cartridge and the shutter portion, the shutter portion, and further comprising a guide portion to sandwich the upper cartridge in the vertical direction.

[0014]

BEST MODE FOR CARRYING OUT THE INVENTION A disk cartridge of the present invention will be described below in the order of an optical disk to be stored and a cartridge .

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

The recording capacity is set larger than 650 MB (megabytes) so that the image information can be recorded sufficiently. Desirably 4 in the data compressed state
The recording capacity is preferably about 1.0 GB (gigabytes) or more so that image information of about 5 minutes (at 3.3 Mbps) or more can be recorded.

A specific example will be described with reference to FIGS. The optical disk 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.
It is 6 mm. The center hub 12 is a magnetic body and can be fixed to the drive-side spindle with a magnet. This optical disk 11 has a data wavelength of 650 nm
The optical beam is used for magneto-optical recording and reproduction.

The center hub 12 is, as shown in FIG.
It has a brim-shaped disk shape with an outer diameter of 11.0 mm (D1) and an inner diameter of 2.0 mm (d), and the central protruding portion has a diameter of 7 mm (D
2). The step is 0.5 mm.

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

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 centers of the grooves) is 1.04 μm, and data is recorded in the grooves and the land portion sandwiched between the grooves.

The information recording area has a radius of 12.02-2.
The position is 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 side walls that always face each other.

According to the optical disc having such a structure, it was possible to record data of about 1 GB and to reproduce the data with high quality.

○ 2 Cartridge This cartridge has an outer shape of 6 to improve portability.
It is desirable that the thickness is smaller than 5 mm square and the thickness is thinner than 5 mm.

A specific example will be described below with reference to FIGS. 3 to 7. FIG. 3 is a plan view of the cartridge closed state (a),
(B) Bottom view, (c) C direction arrow view, (d) D direction arrow view, (e) E direction arrow view, FIG. 4 shows (a) plan view of cartridge open state, (b) bottom surface Figure, (c) C direction arrow view,
(D) D direction sectional view, FIG. 5 cartridge sectional view, FIG.
7 is a perspective view of the cartridge (on the side opposite to the light incident side), and FIG. 7 is a perspective view of the cartridge (on the side opposite the light incident side).

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

The cartridge comprises a shell 3 which serves as a case for protecting the disk, and a shutter 4 which opens and closes an opening for accessing the read / write head and the rotary drive shaft. The cartridge surface is labeled. 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 apparatus (disk drive) (direction A in the figure)
In addition, on the side where the shutter 4 is formed, a notch 10 is provided that does not interfere with the disc. This cutout is
2mm (L6) wide and 27.5mm long (tapered part 6
mm (L4) + straight portion 21.5 mm (L5)). As a result, the magnetic head arm for writing (the part where the arm is attached to the recording / reproducing device (root))
Can be arranged closer to the disc (on the B direction side than the maximum insertion position of the disc recording / reproducing apparatus in the A direction). That is, it becomes possible to arrange the magnetic head arm for writing even inside the rectangle that encloses the disk. As a result, the recording / reproducing device can be downsized. Here, an example in which the mounting portion of the write magnetic head arm to the recording / reproducing device is arranged in the cutout portion is described, but of course, the mounting portion of the optical head arm to the recording / reproducing device is arranged in the cutout portion. It doesn't matter.

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

Therefore, when viewed from the optical pickup, the opening is large and not only the objective lens but also the actuator housing can be accessed inside the cartridge. Although it was necessary to add the number, by adopting this cartridge, it is possible to greatly contribute to the reduction in the thickness of the device only in the overlapping portion of the two.

Further, in the cartridge sectional view of FIG. 5, a tapered rib that comes into contact with the center hub recess is projected on 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) to φ5.4 mm (D5) to φ6.4 m
Up to m (D6) forms a linear tapered portion. A horizontal plane is formed between D4 and D5. 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 ribs so that the tip does not come into contact with the cartridge surface even if the length of the rotary drive shaft is long to some extent. The height from the top of the rib to the counter boring surface is 0.85 mm (T2), and the counter boring depth is 0.35 mm (T2-T) with respect to the inner surface of the cartridge.
1).

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

FIG. 8 (a) is a plan view showing an embodiment thereof,
8B is a side view thereof, FIG. 8C is a back view showing an embodiment of the present invention, FIG. 9A is a plan view (shutter opening view) showing the embodiment, and FIG. FIG. 9B is a side view (shutter opening view) showing the embodiment, FIG. 9C is a rear view showing the embodiment (shutter opening view), and FIG.
9A is a cross-sectional view taken along the line AA, and FIG. 11 is a cross-sectional view taken along the line B- in FIG.
B and FIG. 12 are perspective views (shielding area of the shutter and the second opening), FIG. 13 is a layout view of the second opening and the actuator, and FIG. 14A is a view when the cartridge of the cartridge holder is inserted. Shutter open / close view (initial stage of insertion), FIG.
FIG. 14B is the same insertion diagram, FIG. 14C is the same insertion end diagram, and FIG. 15A is a plan view of the magneto-optical recording / reproducing device.
FIG. 15B is a side view of the magneto-optical recording / reproducing apparatus, and FIG.
(C) shows a back view of the magneto-optical recording / reproducing apparatus. 8 to 11 and 15, the cartridge 102 is composed of an upper cartridge 103, a lower cartridge 105, a shutter 108, a lock lever 118, and the like. Inside the cartridge 102, a magneto-optical disk 101 for recording an information signal is provided. , Is rotatably stored. 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 recording or reproducing information signals. It has a second opening 106 that the pickup unit 127 for performing faces. The entire cartridge 102 is mounted in the magneto-optical recording / reproducing device 123 shown in FIG. 15 to record / reproduce information.

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

The shutter 108 includes upper and lower shutter portions 1 that shield the first and second openings 104 and 106.
09, a vertical portion 110 that connects the upper and lower shutter portions 109, a portion of two claws 111 that serves as a guide at the time of opening and closing and prevention of disengagement, a guide portion 112 for preventing disengagement of the claw 111, and a lock lever 118 described later. A hole portion 11 into which a lock portion 113 that is locked to an open lever 120 for opening and closing a shutter 108 described later is inserted.
It has a configuration having 5.

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

The guide groove 114 may be provided on either side of the upper cartridge 103, but in this example, the guide groove 114 on the insertion side is between the upper cartridge 103 and the guide groove 114 on the rear side between the lower cartridge 105. Is provided on the side of the upper cartridge 103 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 way, it is not visible from the outside due to the design, and it is possible to increase the degree of freedom in design.

Second opening 10 of lower cartridge 105
In the conventional example 6, the shielding is performed by using one plane of the bottom surface, but in this example, as shown by the hatched portion in FIG. 9 or 12, the shielding area 122 for the shutter 108 is made to be the plane of the bottom surface portion. By shielding using two planes of the side surfaces, 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 on 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 downsized.

Next, the opening / 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, the lock portion 113 of the shutter 108 is locked by the lock lever 118 arranged inside the upper and lower cartridges 105. When the cartridge 102 is mounted in the apparatus, the cartridge 102 is inserted into the cartridge holder 119. First, the protrusion of the open lever 120 having a spring property for opening and closing the shutter 108 provided in the cartridge holder 119 causes the shutter 108 to move. The lock lever 118 is released by the release member 121 provided in the cartridge holder 119 after entering the hole 115 provided in the vertical portion 110.
The shutter 1 is opened by the open lever 120.
08 is fixed at a predetermined position of the cartridge holder 119. The cartridge 102 main body is inserted into the back by the subsequent pushing operation of the cartridge 102, but since the shutter 108 is fixed at that position,
The shutter 108 is opened and closed relatively. If it closes, 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 opposite side of the recording surface of the magneto-optical disk 101. Is.

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

FIG. 16 is a sectional view showing the entire cartridge on the left side and an enlarged view of the central portion of the cartridge on the right side. In the figure, the rotary shaft, the cartridge holder, the cartridge positioning pin, etc. are omitted and simplified.

FIG. 16A shows a state in which the disk 201 in the cartridge 209 is horizontally closest to the end, and vertically in contact with the lower surface of the inner wall of the cartridge by gravity. Here, the disc 201 has a center hub 207 having a center hole 206 in the center thereof, and the center hub 207 is a cylindrical recess 21.
Have four. Further, the cartridge 209 has a convex portion 215 on the inner wall of the cartridge on the opposite side to the spindle motor and the disk, and the peripheral portion 214a of the concave portion.
A part of the convex portion 215 is included in the range in which there may exist. The shape of the convex portion has an inclination that expands toward the outer periphery as it goes to the root. This convex portion may be in the shape of a single connected ring, or may be three or more independent convex portions arranged on the circumference. Although the disk having the center hub is described in this example, the disk may have an integral structure that does not have the center hub but has a recess in the center.

Next, the state of FIG. 16B will be described. The center hub 207 hits the rotating shaft and the disc 201 is pushed up to the upper surface side of the cartridge 209, 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, the disc 1 moves toward the right side of FIG. 16 along the inclination of the convex portion 215, and is moved to a position where it fits on the rotary shaft 208. The disk is loaded into the motor by fitting on the rotary shaft 208 of the motor as shown in FIG.

Although an example is shown here, the disc is moved to a position required for the disc to fit on the rotary shaft of the spindle motor, and then the disc is stably mounted on the rotary shaft of the spindle motor. It suffices if it has a structure that enables it.

[0046]

As described above, according to the disc cartridge of the present invention, the tip of the drive shaft does not touch the surface of the cartridge 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 drawings]

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

FIG. 2 is a diagram showing an example of a center hub of FIG.

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

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

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

FIG. 6 is a front perspective view of the disc cartridge shown in FIGS.

7 is a rear perspective view of the disc cartridge shown in FIGS. 3 and 4. FIG.

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

FIG. 9 is a diagram for explaining an opening / closing mechanism of a shutter of a disc cartridge (when the shutter is open).

10 is a cross-sectional view taken along the line AA of FIG.

11 is a cross-sectional view taken along the line BB of FIG.

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

FIG. 13 is a schematic diagram showing a main part when a disc 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 device.

FIG. 16 is a diagram illustrating the positional relationship between the disc cartridge and the rotation drive shaft when the disc cartridge is inserted.

[Explanation of symbols]

3 shell 4 shutter 5 Labeling position 6 Positioning hole 7 Notches for loading 10 notches 11 disk substrate 12 Center hub 20 Counterpart

─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Nobuyuki Usui 22-22 Nagaikecho, Abeno-ku, Osaka-shi, Osaka Sharp Corporation (72) Tomoyuki Miyake 22-22 Nagaike-cho, Abeno-ku, Osaka, Osaka Sharp Corporation (72) Inventor Toshiharu Inui 22-22 Nagaikecho, Abeno-ku, Osaka-shi, Osaka Prefecture Sharp Corporation (72) Inventor Hideharu Tajima 22-22 Nagaike-cho, Abeno-ku, Osaka City, Osaka Prefecture (72) Inventor Akira Takahashi, 22-22 Nagaike-cho, Abeno-ku, Osaka-shi, Osaka (56) References JP-A-6-28810 (JP, A) JP-A-6-20427 (JP, A) Sankaihei 2--113872 (JP, U) Actual development Sho 63-200277 (JP, U) (58) Fields investigated (Int.Cl. ⁷ , DB name) G11B 23/03 604 G11B 23/03 605

Claims (2)

(57) [Claims] And 1. A disc in the disc cartridge and a cartridge for rotatably accommodating the optical disc, the optical disc includes a center hub, the center hub
Is the center hole through which the rotary drive shaft of the optical disk passes.
The rotation drive shaft is inserted on the outer peripheral side of the center hole of
And a recess formed on a surface opposite to the side, and the cartridge has an inner surface facing the recess of the center hub.
On the surface, a counterbore formed in a concave shape from the other parts so that the tip of the rotary drive shaft is positioned in a non-contact manner, and the counterbore of the counterbore.
It protrudes from the outer peripheral side and contacts the recess of the center hub.
Move the optical disk to a position where it can be fitted to the rotary drive shaft
A disk cartridge, comprising: a taper-shaped rib that allows the disk cartridge to move. 2. The disk cartridge according to claim 1, wherein the cartridge includes an upper cartridge, a lower cartridge, and a shutter portion, and the shutter portion.
However, there is a guide part that holds the upper cartridge vertically.
A disc cartridge characterized by the fact that it has been obtained .