JPH08221935A - Disk cartridge - Google Patents

Abstract

PURPOSE: To reduce cost and to make capacity large by providing a disk where information is recorded, a case in which the disk is encased, a shutter which opens/closes the window of the case, and a spring which energizes the shutter. CONSTITUTION: The disk 1 is constituted so that a signal can be recorded on and reproduced from both sides, and the cases 2 and 3 are divided into two to be formed and stuck to each other. The shutter 4 is integrally formed of shutter surfaces 4a and 4b corresponding to both sides of the disk and a side surface part 4C integrally coupling both surfaces to be in a U-shape. Two springs 40 and 41 are torsion coil springs and they are in a stretched state so as to energize the shutter 4 to hold at positions where the shutter surfaces 4a and 4b of the shutter 4 close the windows 2a and 3a respectively. Two springs have the same shape, the kind of parts is not increased, and the cost is reduced.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disc cartridge, a disc cassette, a disc caddy, a disc half, or a disc case which accommodates a disc-shaped recording medium such as an optical disc.

[0002]

2. Description of the Related Art A compact disc (hereinafter referred to as CD) system, which is standardized in Red Book, Yellow Book, etc. and records information on a disc having a diameter of 120 mm, has been widely used mainly for music. Although the system has a certain capacity for handling music information, when recording video information such as a CD-ROM, the amount of information increases, so the capacity becomes insufficient, resulting in a short recording time and image quality. There was an unavoidable decline. As a movement for coping with this, for example, a digital video disk (hereinafter, DVD) system, which is being standardized, and the like can be cited.

[0003]

The problem to be solved by the present invention is to increase the capacity of a CD system or a disk system having substantially the same size as that of the CD system. The concept of a new disk cartridge and the technical problem are as follows. Is.

1) In order to prevent scratches, dust, and dirt associated with high-density recording, the standard condition is that the disc is inserted in the cartridge. Even in a CD system, there is a case of a CD caddy having a length of about 135 mm, a width of about 125 mm, and a thickness of about 8 mm, but at present, a so-called tray loading method, which does not use the CD caddy, is predominant.

2) Double-sided recording: CD is single-sided recording. The capacity can be doubled by simple calculation.

3) Enabling compatible reproduction of CD ... A selling point is that compatible reproduction of the existing CD is also possible in the disk device using the new disk cartridge. Therefore, it is an essential condition that the disc can be taken in and out and that the disc for the CD system can be built in. However, the above CD caddy is single-sided recording, and the disc clamper is attached to the case side of the caddy, whereas the new disc cartridge is a double-sided recording system.
The clamper is located on the disk device side. Therefore, when the CD caddy is mounted on the disc device of the new disc cartridge, the two clampers interfere with each other. Therefore, it is necessary to prevent the CD caddy from being attached to the disc device of the new disc cartridge.

4) Realization at low price ... In order to support the price for general household use, a low cost configuration including the disk device is possible.

An object of the present invention is to solve the above problems and provide a disk cartridge suitable for a large capacity CD.

[0009]

In order to solve the above problems, the present invention implements the following means.

1) The shutter of the disk cartridge includes a structure in which both sides of the disk are supported, both directions can be slid, and the disk can be inserted and removed. Further, the case is provided with a structure for preventing wrong insertion of a different type cartridge such as a CD caddy.

2) Means for urging the shutter is provided at the position where the window is closed.

3) When the disk is taken in and out, the structure is such that at least a part of the surface parallel to the disk surface of the case is opened.

4) When the disc is to be taken in and out, the structure is such that the portion outside the shutter movement range of the case is opened.

5) A compact disc standard disc can be incorporated.

6) As a biasing means for the shutter, one torsion coil spring whose both arms directly engage with the case and the shutter in the corner areas on both sides of the shutter when the window is closed. Place each one.

7) A disc surface discriminating means is provided which can discriminate whether the recordable and / or reproducible surface of the disc is one side or both sides.

8) A disc surface designating means for designating a recordable and / or reproducible surface of the disc is provided.

[0018]

Each of the above-mentioned means 1) to 6) acts as follows 1) to 6).

1) Supports both sides of the disc, and in order to support both sides, even when the disc cartridge is turned over and inserted, the shutter opening / closing mechanism can be handled by one set.
The disk in the cartridge can be replaced.

2) Even if the shutter is opened intentionally,
The shutter closes automatically when the opening force is released.

3) The disc surface is easy to see at the time of opening, and the handling property when the disc is taken in and out is improved.

4) Interference between the shutter and the aperture structure can be avoided.

5) A compact disc standard disc can be mounted in the disc device for the new disc cartridge.

6) A shutter having a bidirectional opening and a long stroke can be realized by a thin cartridge and a small number of parts.

7) It is possible to easily know whether the recording surface of the disc is one side or both sides.

8) It is possible to easily know which side the recording surface of the disc is.

[0027]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of the present invention will be described below with reference to FIGS.
Will be explained.

FIG. 1 shows a disk cartridge of the present invention. (A) is a partially broken plan view, (b),
(C), (d) is a side sectional view from a lower side, a right side, and an upper side, respectively.

The basic structure of the disk cartridge 100 of the present invention includes a disk 1 for recording information, cases 2 and 3 for housing the disk, a shutter 4 for opening and closing windows 2a and 3a of the case, and a shutter 4. Two springs 40, 41 for urging, a door 5 opening a part of the case,
Consists of

The disc 1 can record and reproduce signals on both sides thereof.

The cases 2 and 3 are formed by being divided into two pieces and are bonded together. Windows 2a and 3a are formed to expose a part of the disk surface so that information can be recorded and reproduced. Partition walls 2p and 3p are formed between the disk 1 and the springs 40 and 41 to prevent dust.

The shutter 4 is integrally formed in a U-shape by shutter surfaces 4a and 4b corresponding to both sides of the disk and a side surface portion 4c integrally connecting the both. The projections 4p and 4q are engaged with the guide groove 2g formed linearly on the case, and are mounted so as to be linearly slidable in the left-right direction in the drawing.

The two springs 40 and 41 are torsion coil springs, which are in a stretched state and are biased so that the shutter surfaces 4a and 4b of the shutter 4 are held in positions for closing the windows 2a and 3a, respectively. ing. Also, the two springs have the same shape, so as not to increase the number of parts,
We are working to reduce costs. And two cases 2, 3
One is installed in each of the two corner areas 50 and 51 sandwiching the shutter 4 on the left and right. The ends of the arms of each spring are bent at right angles to the axial direction of the winding of the coil part, and each end 40a,
41a is engaged with the groove portions 2d and 3d of the case corner. The other ends 40b and 41b are engaged with stoppers 3p and 3q formed on the case 3 and having a V-shaped cross section (see also FIG. 2A), and the spring is stretched as described above. Since it is in the open state, it is positioned with high accuracy in the vertical and horizontal directions in the figure. In the present invention, the torsion coil spring has a structure in which both ends of the torsion coil spring are directly engaged with the case without interposing other parts, and the number of parts is not increased. The hook portions 4d and 4e are integrally formed with the shutter 4 so as to coincide with the vertical and horizontal positions and to shift the height in the thickness direction of the disc.
The deepest part of the groove is located. This allows
The shutter 4 is held at the left and right in the figure, that is, in the center position in the slide direction.

The side surfaces of the cases 2 and 3 viewed from the direction of FIG. 1B are open, and the two springs can be inserted and assembled from one direction at a time in a bent state. The assembly is extremely good.

The door 5 rotatably engages with the case 2 at 5a and 5b, and opens so that the disc can be taken in and out, as shown by the dotted lines 5c and 1a. Here, since the door 5 has a surface parallel to the disk surface and is opened, the visibility of the disk and the ease of putting in and out at the time of opening are good.

The door 5 is a commercially available 8 cm CD-RO.
As in the case of the M cartridge, the side surface of the case may be opened.

The door 5 may not be provided if it is desired not to take out a disc such as a rental disc.

The operation when the shutter opens and closes the window is shown in FIGS.

In FIG. 2, the disk cartridge 10
When 0 is inserted into the device 200 (downward in the drawing), it is axially supported by the shaft 202 fixed to the device, is urged clockwise by the spring 203 in the drawing, and is in contact with the stopper 204. Shutter opening lever 2 on standby at
The front end portion 201a of 01 is the end portion 4 of the side surface portion of the shutter 4.
abuts r. When the shutter opening lever 201 is further inserted from this state, the shutter opening lever 201 rotates counterclockwise in the figure and slides the shutter 4 to the left side in the figure. When the slide starts, as shown in FIG. 3, the spring 4 on the left side is
The right end portion 40b of 0 is pressed and engaged with the groove portion of the left hook 4d of the shutter, and the protrusion 3p of the case
Break away from On the other hand, the left end 41b of the spring 41 on the right side in the figure is released from the right hook 4e of the shutter while being pressed and engaged with the protrusion 3q of the case, and the spring 41 on the right side is held as it is. It Then, as the shutter 4 slides, the right end 4 of the left spring 40
0b moves linearly and deforms in the corner region 50 as shown in FIG. Here, the side surface portion 4c of the shutter 4
Is provided with a disc caddy discriminating hole 4s, and at the position where the disc cartridge 100 is inserted to the innermost position, a projecting portion 210 is provided on the device 200 side corresponding to the discriminating hole 4s. The insertion of the disc cartridge 100 can be completed only when the protrusion 210 is fitted into the discrimination hole 4s. And a sensor (not shown) indicates that the insertion was completed up to this completion position.
After that, the entire disc cartridge 100 is moved in the rotation axis direction of the disc, and the mounting of the disc for recording and reproduction is completed.

Here, the discrimination hole 4s is provided on the CD caddy.
Since it is not present, the side surface portion 4 of the shutter 4 is located before the completion of insertion.
Since c and the tip of the protrusion 210 collide with each other, the insertion cannot be completed. This prevents the CD caddy from being mounted.

In the present invention, the disk cartridge 100 is constructed symmetrically in the state of FIG. 4 and 6 are side views showing the outer shapes of the cases 2 and 3 and the shutter 4. In FIG. 4, the discrimination hole 4s is shown in FIG.
As shown in (a), it is formed in the center of the side surface portion 4c of the shutter 4 so as to be point-symmetrical. Therefore, when the disc cartridge 100 is turned upside down and inserted, the back side of FIG.
It is configured so that it can operate in exactly the same way as
The mechanism shown in FIGS. 2 to 3 on the 0 side can be applied to both sides of the disk with only one set, thus simplifying the structure of the device and reducing the cost. Further, although the discrimination hole 4s is rectangular in this embodiment, it may be circular or the like as shown in FIG. 5B. Further, as described above, the side surface portion 4c of the shutter 4 is
If it is point-symmetrical in, a plurality of holes may be formed as shown in FIG. Further, as shown in FIG. 5, the reducing portions 20a and 20b are provided on the front edge side orthogonal surface in the insertion direction of the cases 2 and 3 so as to be point-symmetrical on the front edge side orthogonal surface,
The protrusion 210a may be fitted in correspondence with this. Further, the reduction unit 20 may have any point symmetry, as shown in FIG.
The arrangement configurations shown in (a) to (d) of FIG.

Further, among the outer dimensions of the case, the width dimension and / or the thickness dimension, which are the front dimension of the insertion into the apparatus, may be smaller than the CD caddy as the cartridge whose insertion should be prevented.

When the disc is single-sided recording, by determining only one of the reduction units 20a and 20b corresponding to the recording side, it is determined that the recording is double-sided recording. It is possible to specify which side the is.

Further, the combination of the reduction portion and the projection portion using the above-mentioned shape means may include, for example, the following as long as the arrangement relationship is point-symmetrical on the front edge side orthogonal plane. It can also be replaced with all other detection means.

1) A combination of a light emitting diode and a light receiving element using optical means.

2) A combination of an MR sensor using magnetic means and a magnet.

3) Combination of an ultrasonic transmitter and its receiver using acoustic means.

4) A combination of a contact switch using electric means and a conductor.

When the disc cartridge 100 is taken out of the apparatus 200, the operation reverse to the above is performed.
1 to 3, the right end 40 of the left spring 40
Reference numeral b is for returning to a state of being pressed by the protrusion 3p of the case 3.

Further, the structure using the torsion coil spring as the biasing means of the shutter means in the present embodiment, like the currently commercially available CD caddy, is in the case where the disk is not arranged and in the above-mentioned case. One extension coil spring may be arranged in the area occupied by the shutter means at the position where the window is closed.

[0051]

According to the present invention, a CD system, or a disk system having substantially the same size as the CD system, can be provided at a low cost to provide a large-capacity disk cartridge.

[Brief description of drawings]

FIG. 1 is a plan view showing a disc cartridge of the present invention,
And a side view.

FIG. 2 is a plan view showing a state in which the disc cartridge of the present invention has been inserted into the apparatus.

FIG. 3 is a plan view showing a state in which the disc cartridge of the present invention is completely inserted into the apparatus.

FIG. 4 is a plan view showing a configuration of a discrimination hole provided in the shutter of the disc cartridge of the present invention.

FIG. 5 is a plan view showing the structure of a discrimination hole provided in the case of the disc cartridge of the present invention.

FIG. 6 is a plan view showing an alternative configuration of the discrimination hole provided in the case of the disc cartridge of the present invention.

[Explanation of symbols]

 1 Disc 2, 3 Case 4 Shutter 5 Door 40, 41 Spring 100 Disc Cartridge 200 Device

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Toshifumi Takeuchi, 292 Yoshida-cho, Totsuka-ku, Yokohama-shi, Kanagawa Stock company, Hitachi Media Visual Media Research Institute (72) Inventor Masafumi Nakamura 292, Yoshida-cho, Totsuka-ku, Yokohama-shi, Kanagawa Inside Hitachi Media Media Research Laboratories (72) Inventor Masayuki Inoue 292 Yoshida-cho, Totsuka-ku, Yokohama-shi, Kanagawa Stock (72) Inventor Yoshio Suzuki 292 Yoshida-cho Totsuka-ku, Yokohama, Kanagawa Hitachi, Ltd. Visual Media Research Institute (72) Inventor Michio Miura, 292, Yoshida-cho, Totsuka-ku, Yokohama-shi, Kanagawa Stock Company Hitachi Ltd. Visual Media Research Laboratories

Claims (13)

[Claims] 1. A disc on which information is recorded and / or reproduced, and a case for accommodating the disc and having windows for exposing a part of the disc to the outside corresponding to both sides of the disc, A shutter means that is movably attached to the case so as to open or close the window, and is movable so as to open the window in both directions by sandwiching the position of closing the window in the moving direction. A disc cartridge characterized by being provided. 2. The disc cartridge according to claim 1, further comprising a disc loading / unloading means for opening / closing a part of the case so that the disc can be loaded / unloaded into / from the case. 3. The disk cartridge according to claim 1, wherein the shutter means is provided with shutter urging means for urging the shutter at a position where the window is closed. 4. The disk loading / unloading means comprises a structure capable of opening and closing at least a part of a part of the case parallel to the disk surface of the disk. 3. The disk cartridge according to item 3. 5. The disk cartridge according to claim 2, wherein the disk loading / unloading means has a structure capable of opening and closing a surface of the case orthogonal to the disk surface of the disk. 6. The disk cartridge according to claim 2, wherein said disk loading / unloading means is formed by opening said case at a portion outside the range of movement of said shutter means. 7. A disc surface discriminating means capable of discriminating whether the recordable and / or reproducible surface of the disc is one side or both sides. 2. The disk cartridge described in 2 or 3. 8. The disc cartridge according to claim 1, further comprising disc face designation means for designating a recordable and / or reproducible face of the disc. . 9. A disc of a diameter of about 120 mm and a thickness of about 1.2 mm, which is defined in the compact disc (hereinafter referred to as CD) standard such as a red book or a yellow book, or a disc of approximately the same size can be incorporated. The disk cartridge according to claim 1, 2 or 3, characterized in that. 10. The disk cartridge according to claim 1, wherein said case has a length of about 135 mm, a width of about 125 mm and a thickness of about 8 mm. 11. The case has a width of at least 125 m.
The disk cartridge according to claim 10, wherein the disk cartridge has a thickness of m or less and / or a thickness of 8 mm or less. 12. The case is formed in a rectangular shape, and the shutter means linearly moves in parallel with an edge of the case,
The biasing means includes a torsion coil spring arranged in a corner region formed by the rectangular case and the circular disk, and the torsion coil spring has two corners located in a moving direction of the shutter means. 4. The disk cartridge according to claim 3, wherein one arm is arranged in each of the areas, and both arms thereof are directly engaged with the case and the shutter means. 13. The case is formed in a rectangular shape, and the shutter means linearly moves in parallel with an edge of the case,
The biasing means includes a tension coil spring arranged in the rectangular case in an area where the circular disk is not arranged and in an area occupied by the shutter means at a position for closing the window. The disk cartridge according to claim 3, wherein the disk cartridge is provided.