JP3487086B2 - Disk holder - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disc holder that holds a disc such as an optical disc or a magneto-optical disc and can be loaded in a recording and / or reproducing apparatus.

[0002]

2. Description of the Related Art Conventionally, CD (compact disc) and C
D-ROM (Read Only Memory), CD
A disk case generally used for storing and carrying a disk-shaped recording medium (hereinafter, referred to as a disk) such as -R (Recordable) is a case main body in which the disk is placed and stored, and a case main body. The cover has a lid formed to be openable and closable, and a tray attached to the case body.

The case main body is formed in a substantially rectangular shallow dish shape having an accommodating portion for accommodating a disc, and a substantially rectangular plate-like lid is provided so as to be openable and closable via a hinge. The tray portion is formed in a substantially rectangular plate shape, and a circular disc mounting portion on which a disc is mounted is recessed on the main surface.

[0004]

As described above, in the conventional disk case, when the disk is loaded in the recording / reproducing apparatus, the user grips the disk, takes it out from the case body, and loads it in the recording / reproducing apparatus. Work was needed.

Therefore, when the disc case is gripped and taken out, the signal recording surface of the disc is scratched or soiled with fingerprints or the like, which causes malfunction in the recording / reproducing operation of the information signal. There was a problem.

In addition, other conventional disk cases include
An information recording disk case disclosed in Japanese Utility Model Publication No. 5-31724, or a disk capable of directly loading a disk holder 53 holding a disk 2 into a recording / reproducing apparatus as shown in FIG. There is a case 50.

As shown in FIG. 8, a disk case 50 is provided.
In general, it has a main body portion 51 in which the disc 2 is housed, a lid portion 52 which is openably and closably provided in the main body portion 51, and a disc holding body 53 which holds the disc 2.
The case main body 51 is formed in the shape of a rectangular shallow dish, and a storage portion for storing the disk holding body 53 is formed inside. A holding member 52A for holding the central portion of the housed disk 2 is disposed in the central portion of the lid body portion 52. The disc holder 53 is provided with a disc mounting portion 53A on which the disc 2 is mounted. In addition, a U-shaped recording / reproducing opening 53B is provided in the disk mounting portion 53A in accordance with the moving area of the optical pickup device on the recording / reproducing apparatus side (not shown).

In the disk case 50 constructed as described above, when the disk 2 is loaded in the recording / reproducing apparatus, the lid 52 of the main body 51 is opened and the disk holder 53 is taken out, and if necessary, taken out. It is necessary to change the disc holder 53 and load it in the recording / reproducing apparatus. Therefore, the disk case 50 is mounted on the recording / reproducing apparatus when the disk holder 53 and the main body 5 are loaded.
There was a risk of accidentally dropping 1 and damaging it.

That is, the disk case 50 is
There is a problem that the operability when the disk holder 53 is pulled out from the main body 51 and taken out, and the operability when the disk holder 53 is loaded into the recording / reproducing apparatus are insufficiently considered.

Therefore, according to the present invention, the disc can be stored, the disc can be easily loaded in the recording and / or reproducing apparatus, and the disc can be prevented from being scratched when loaded. It is an object of the present invention to provide a disk holder that can be manufactured.

[0011]

In order to achieve the above-mentioned object, a disc holder according to the present invention has a disc holding opening portion for holding a disc in the center thereof and is mounted on a disc tray. A holding frame portion having a positioning hole through which a positioning pin that is erected on the mounting surface of the disc tray is inserted, and recording and / or recording is performed at an inner peripheral portion of the disc holding opening of the holding frame portion. Alternatively, first and second holding portions that are provided symmetrically to each other with respect to the center line of the disc parallel to the loading direction with respect to the playback device and hold the outer peripheral portion of the disc, and the disc holding opening of the holding frame portion. Is located at the inner peripheral portion of the disk and is elastically displaceable symmetrically with respect to the center line of the disk parallel to the loading direction for the recording and / or reproducing apparatus, and holds the outer peripheral part of the disk. And a third and fourth holding portion having elastic pieces for urging the disc in the radial direction. The third and fourth holding portions are arranged at the side end portion side facing the one side end portion facing the loading direction of the recording and / or reproducing apparatus, and the third and fourth holding portions are provided. The holding part has an operation piece in which a base end portion is integrally formed with the elastic displacement piece, and a tip end portion is formed to project in a direction orthogonal to the loading direction of the recording and / or reproducing apparatus. When the third and fourth holding portions are placed on the disc tray, the elastic displacement pieces are elastically displaced through the operation pieces with which the disc opening pins provided upright on the disc tray come into contact with each other. The disk held by the fourth holding unit is released.

Further, the disc holder according to the present invention has a disc holding opening portion for holding the disc in the central portion, and is erected on the placing surface of the disc tray when placed on the disc tray. And a center of the disc that is located in the inner peripheral portion of the disc holding opening of the holding frame and that is parallel to the loading direction of the recording and / or reproducing apparatus. First and second holding portions that are provided symmetrically to each other with respect to the line and hold the outer peripheral portion of the disc, and are positioned on the inner peripheral portion of the disc holding opening of the holding frame portion for recording and / or recording. Alternatively, an elastic displacement piece is provided which is elastically displaceable symmetrically with respect to the center line of the disc parallel to the loading direction with respect to the reproducing device and which holds the outer peripheral portion of the disc and biases the disc in the radial direction. And a third and fourth holding portion having. The third and fourth holding portions are arranged at one end facing the loading direction of the recording and / or reproducing apparatus, and the third and fourth holding portions are elastically displaced. The base part is integrally formed on one piece, and the tip part can record and / or
Alternatively, it has an operation piece formed to project in a direction orthogonal to the loading direction with respect to the reproducing device. When the third and fourth holding portions are placed on the disc tray, the elastic displacement pieces are elastically displaced through the operation pieces with which the disc opening pins provided upright on the disc tray come into contact with each other. The disk held by the fourth holding unit is released.

The disk holder constructed as described above is
The third and fourth holding portions elastically displace the elastic displacement pieces in the disc holding opening of the holding frame portion, so that the first to fourth holding portions reliably hold the disc. Then, the disc holder is loaded in the recording and / or reproducing apparatus while holding the disc. That is, since the disc holder does not need to touch the disc when loaded in the recording and / or reproducing device, it can be easily loaded in the recording and / or reproducing device. Therefore, according to this disc holder, when loaded in the recording and / or reproducing apparatus, the signal recording surface of the disc becomes dirty,
Scratches and damage to the disc are prevented. Further, by providing the disc holder with the positioning hole, when the disc holder is placed on the disc tray, the positioning pin erected on the placing surface of the disc tray is inserted into the positioning hole to easily and securely move to a predetermined position. Placed in
Then, the disc opening pin erected on the mounting surface of the disc tray abuts on the operation piece of the third and fourth holding portions to swing the elastic displacement piece and hold it on the first to fourth holding portions. The released disc.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Specific embodiments of the present invention will be described below with reference to the drawings.

As shown in FIGS. 1 and 2, the disc holder 1 of the embodiment is a holding frame portion 1 formed in a substantially rectangular shape.
A, a first holding portion 9 and a second holding portion 10 that hold the outer peripheral portion of the disk 2, and a third holding portion 1 that holds the outer peripheral portion of the disk 2 and biases the disk 2 in the radial direction.
The first and fourth holding portions 12 are provided.

A circular holding opening 7 for holding the disk 2 is formed on the main surface of the holding frame portion 1A. The holding frame portion 1A is located on the inner peripheral portion of the holding opening portion 7 on both sides parallel to the loading direction (hereinafter, simply referred to as loading direction) of the recording / reproducing devices 21 and 22 and the case body 4 described later. The disk mounting plates 8A and 8B on which the held disk 2 is mounted are integrally formed, and both side ends parallel to the loading direction are formed narrowly by the disk mounting plates 8A and 8B. The mechanical strength of is secured.

Further, on the inner peripheral portion of the holding opening portion 7, a regulating projection 16 is integrally formed at a position facing the loading direction so as to contact the outer peripheral portion of the disc 2 to be held and regulate the position to be held. It is formed to project.

Further, the holding frame portion 1A is provided with a recording / reproducing concave portion 17 on one side end facing the loading direction on the main surface and the bottom surface. The recording / reproducing concave portion 17 is provided. The recording / reproducing devices 21 and 22 for the optical disc 2
The optical pickup device on the side is prevented from coming into contact with the moving side.

Further, the holding frame portion 1A has a structure shown in FIGS.
As shown in FIG. 5, the grip 18 is integrally formed at the center of one side surface orthogonal to the loading direction so that the user grips the grip 18 and the recording / reproducing devices 21 and 22.
And so on. The holding frame portion 1A may be provided with a notch groove for gripping on both side surfaces parallel to the loading direction.

Further, as shown in FIG. 2, the holding frame portion 1A is located at the corner portions on both side surfaces parallel to the loading direction,
Positioning holes 19A and 19B for positioning with respect to the loading portions of the recording / reproducing devices 21 and 22 are provided, respectively. Further, in the holding frame portion 1A, engaging recesses 20 for engaging pulling-in means such as loading mechanisms on the recording / reproducing devices 21 and 22 on both side surfaces parallel to the loading direction.
A and 20B are provided respectively.

The first holding portion 9 and the second holding portion 10 are
As shown in FIG. 2, the holding opening 7 is provided on the inner peripheral portion at one end facing the loading direction and symmetrically with respect to the center line of the disk 2 parallel to the loading direction. ing.

The first holding portion 9 and the second holding portion 1
0 indicates the first holding claws 14A and the second holding claws 14B formed on the opening edge on the main surface side of the holding opening 7, and the first holding claws on the back side opening edge of the holding opening 7. It has a third holding claw 14C formed between the claw 14A and the second holding claw 14B. The first and second holding portions 9 and 10 hold the disc 2 having the outer peripheral portion inserted between the first and second holding pawls 14A and 14B and the third holding pawl 14C, and The position in the direction orthogonal to the main surface of the disc 2 is regulated.

Third holding portion 11 and fourth holding portion 12
As shown in FIG. 2, in the inner peripheral part of the holding opening 7, one side end opposite to the side end facing the loading direction is located, and the center line of the disk 2 parallel to the loading direction is Are provided symmetrically to each other.

As shown in FIG. 3, the third holding portion 11 and the fourth holding portion 12 are arc-shaped elastic displacement pieces 12A formed along the outer periphery of the disk 2 and the elastic displacement pieces 12A. An operating piece 12B for operating the disk, a swinging opening 12C for swinging the elastic displacement piece 12A and the operating piece 12B, and a first holding claw 1 for holding the disk 2.
5A to the third holding claw 15C.

The elastic displacement piece 12A has a holding frame portion 1 at the base end portion.
It is integrally formed so as to be elastically displaceable along the holding opening 7 of A. The operation piece 12B is formed in a substantially V shape, and one end thereof is integrally formed in the middle of the elastic displacement piece 12A. The operation piece 12B has a tip formed in parallel with a direction orthogonal to the loading direction. Swing opening 12C
The elastic displacement piece 12A and the operation piece 12 on the holding frame portion 1A.
A notch is formed along B.

The first holding claw 15A and the second holding claw 15
B is integrally formed at the tip of the elastic displacement piece 12A so as to project at one opening edge side of the holding opening 7 at a predetermined interval, and the third holding claw 15C is formed in the holding opening 7 On the other opening edge side of the first and second holding claws 15A, 15B
It is located between and is formed so as to integrally project.

The third and fourth holding portions 11 and 12 have the first
And the second holding claws 15A and 15B and the third holding claw 15C
While holding the disk 2 having the outer peripheral portion inserted therethrough, the disk 2 is urged in the radial direction by elastically deforming. In addition, the third and fourth holding portions 11 and 12
The first holding claw 15A to the third holding claw 15C regulate the position in the direction orthogonal to the main surface of the disk 2.

The disc holder 1 having the above structure
About the state of being loaded in the recording / reproducing apparatus in FIG.
And FIG. 5 will be described. First, the disc holder 1
Is grasped by the gripping portion 18 and pulled out from the case body 4 described later while holding the disc 2.

The disc holder 1 is, as shown in FIG.
When the disc 2 is loaded and loaded in the recording / reproducing device 22 having the disc tray 22B that reciprocates with respect to the loading part, the user grips the gripping part 18 and places it on the disc tray 22B. To be done.

The disc holder 1 includes a disc tray 22.
When it is mounted on B, the positioning pin (not shown) standing on the mounting surface of the disc tray 22B is positioned in the positioning hole 19
Since the positioning pins are inserted through A and 19B, they can be easily and surely placed at a predetermined position on the disc tray 22B.

Further, the disc holder 1 has a disc opening pin 26 provided upright on the mounting surface of the disc tray 22B.
When A and 26B come into contact with the operating pieces 12B of the third and fourth holding portions 11 and 12, the elastic displacement piece 12A is swung to open and hold the disc 2 held therein.

The disc holder 1 placed on the disc tray 22B is loaded into the loading part from the insertion opening 22A of the recording / reproducing device 22 when the disc tray 22B moves to the loading part. Further, on one side surface portion of the disc tray 22B, a notch 22C for taking out corresponding to the grip portion 18 of the disc holder 1 to be placed.
Is formed, and the operability for taking out the mounted disk holder 1 is improved.

As described above, in the disc holder 1 of the embodiment, the third and fourth holding portions 11 and 12 are elastically displaceable, so that the recording / reproducing devices 2 and 22 are provided.
It is possible to easily and surely release the held disk 2 when it is loaded in the.

That is, the disc holder 1 can securely store the disc 2 by the third and fourth holding portions 11 and 12, and the recording / reproducing devices 2 and 22.
Can be easily loaded. Therefore, according to the disc holder 1, it is possible to prevent the signal recording surface of the disc 2 from being soiled, scratched, or damaged when it is loaded into the recording / reproducing devices 2 and 22. . Further, according to the disc holder 1, the reliability of the recording operation and the reproducing operation of the information signal by the recording / reproducing apparatus can be improved.

Further, the above-mentioned disc holder 1 is the third
The fourth holding portions 11 and 12 are elastically displaceable, but the third and fourth holding portions 11 and 12 are
A disk holder 3 having a structure in which first and second holding portions 9 and 10 are elastically displaceable instead of 12 will be described below.

As shown in FIGS. 5 and 6, the disc holder 3 holds the holding frame portion 3A formed in a substantially rectangular shape and the outer peripheral portion of the disc 2 and urges the disc 2 in the radial direction. The first holding portion 29 and the second holding portion 30, and the third holding portion 31 and the fourth holding portion which hold the outer peripheral portion of the disc 2.
And a holding portion 32 of

A circular holding opening 27 for holding the disk 2 is formed on the main surface of the holding frame portion 3A. In the holding frame portion 3A, a disc mounting portion 28 on which the held disc 2 is mounted is integrally formed on the inner peripheral portion of the holding opening portion 27. In the disk mounting portion 28, recording / reproducing devices 23, 24 are provided at a central portion of one side end facing a loading direction (hereinafter, simply referred to as a loading direction) to the recording / reproducing devices 23, 24 and the case body 4 described later. A substantially U-shaped recording / reproducing opening portion 28A is opened at one side end and is formed as a notch in accordance with a movement region in which the side optical pickup device moves.

Further, in the recording / reproducing opening 28A,
An arc-shaped support convex portion 28B corresponding to the central portion of the disk 2
Are formed integrally with each other. This support convex portion 28B is
It supports the central portion of the placed disk 2. Therefore, the disk mounting portion 28 holds the disk 2 to be held.
Protect the signal recording surface of.

Further, the holding frame portion 3A is provided with a recording / reproducing concave portion 37 on the bottom surface at one end side facing the loading direction, and by the recording / reproducing concave portion 37, the optical disk 2 is provided. On the other hand, the optical pickup devices on the recording / reproducing devices 23 and 24 side are prevented from coming into contact with each other when they move.

Further, in the inner peripheral portion of the holding opening 27,
At a position facing one end facing the loading direction, a restricting convex part 36 that abuts on the outer peripheral part of the held disk 2 and restricts the held position is integrally formed.

Further, as shown in FIG. 6, the holding frame portion 3A is located at the corner portions on both side surfaces parallel to the loading direction,
Positioning holes 39A and 39B for positioning with respect to the loading portions of the recording / reproducing devices 23 and 24 are provided, respectively. Further, in the holding frame portion 3A, engaging recesses 40 for engaging with a drawing means such as a loading mechanism on the recording / reproducing devices 23 and 24 side on both side surfaces parallel to the loading direction.
A and 40B are provided respectively.

First holding portion 29 and second holding portion 30
Is, as shown in FIG. 6, on the inner peripheral portion of the holding opening 27,
It is located on one end side facing the loading direction and is provided symmetrically with respect to the center line of the disk 2 parallel to the loading direction.

As shown in FIG. 6, each of the first holding portion 29 and the second holding portion 30 has a substantially C-shaped elastic displacement piece 29A formed adjacent to the outer periphery of the disk 2, and this elastic portion. An operation piece 29B for operating the displacement piece 29A, a swing opening 29C for allowing the elastic displacement piece 29A and the operation piece 29B to swing, and disk opening pins 38A, 38B described later for operating the operation piece 29B are provided. Entry groove 2 to enter
9D and a holding claw 34 for holding the disc 2.

The elastic displacement piece 29A has a holding frame portion 3 at the base end portion.
It is integrally formed at the opening edge of the holding opening 27 of A so as to be elastically displaceable. One end of the operation piece 29B is integrally formed in the middle of the elastic displacement piece 29A. The operation piece 29B is
The tip portion is formed parallel to the direction orthogonal to the loading direction. The swinging opening 29C is formed in the holding frame 3A along the elastic displacement piece 29A and the operation piece 29B.

The entry groove 29D extends from the corner of one end of the holding frame 3A facing the loading direction to the position facing the operating piece.
It is recessed parallel to the loading direction. The holding claw 34 is integrally formed at the tip of the elastic displacement piece 12A so as to project.
Further, an opening 29E, which is continuous with the swing opening 29C, is formed in the disc mounting portion 28 along the outer shape of the holding claw 34.

Then, the first and second holding portions 29, 30
The holding claw 34 holds the outer peripheral portion of the disk 2 and elastically deforms the disk 2 to urge the disk 2 in the radial direction.

Third holding portion 31 and fourth holding portion 32
Is, as shown in FIG. 6, on the inner peripheral portion of the holding opening 27,
It is located on one side end side opposite to the side end facing the loading direction and is provided symmetrically to each other with respect to the center line of the disk 2 parallel to the loading direction.

The third holding portion 31 and the fourth holding portion 32 are holding claws 31A formed in the holding opening 27.
And an opening 31B cut out along the outer shape of the holding claw 31A. The third and fourth holding portions 31 and 32 are provided between the holding claw 31A and the opening 31B,
The outer peripheral portion holds the inserted disk 2 and regulates the position of the disk 2 in the direction orthogonal to the main surface.

The case body 4 in which the above-mentioned disc holders 1 and 3 are housed will be described with reference to FIG. As shown in FIG. 7, the case body 4 includes an opening 4 for insertion.
It is formed in a substantially rectangular thin box shape having A. Further, at the opening edge of the insertion opening 4A, a notch 43 for pulling out,
43 is formed and accommodates the disc holder 1 to be stored,
3 holding frame portions 1A, 3A at a position corresponding to one side end portion,
They are formed so as to face each other.

Then, these notches 43 for pulling out
Is a holding frame portion 1A of the stored disk holding bodies 1 and 3,
Expose one side end of 3A to the outside. Therefore, the case body 4 is improved in operability of pulling out the disc holders 1 and 3 from the storage portion by the pullout notch portion 43.

The disk holders 1 and 3 described above are
The holding frame portions 1A and 3A are formed to have a large thickness corresponding to the drawer notch portion 43 of the case body 4, so that the holding frame portion 1A, 3A has a large thickness when being stored in the case body 4. A part of the parts 1A and 3A may be configured to project to the outside of the case body 4.

The insertion opening 4A is formed so that the opening size is closed by the holding frame portions 1A and 3A when the disk holding bodies 1 and 3 are stored in the case body 4. Therefore, the disc holders 1 and 3 housed in the case body 4 are reliably prevented from entering the housing part from the outside.

Although not shown, the case main body 4 includes
When the disc holders 1 and 3 are accommodated, the disc holders 1 and 3 are engaged with the disc holders 1 and 3 on both side surfaces parallel to the accommodating direction of the disc holders 1 and 3 with respect to the accommodating portion, and the disc holder 1 moves from the case body 4. 3 may be formed with a slip-off preventing engagement portion that prevents the slip-out.

Further, in the case body 4, the engaging recesses 20A, 20 provided on the disk holders 1, 3 are formed on both side surfaces parallel to the housing direction of the disk holders 1, 3 with respect to the housing portion.
Gripping notches for gripping the case body 4 may be formed at positions corresponding to B, 40A, and 40, respectively. The case body 4 is provided with a notch for gripping, so that the disc holders 1 and 3 can be automatically exchanged by an auto changer means provided on the recording / reproducing apparatus side for automatically exchanging a plurality of discs 2. You can

Further, one main surface of the case main body 4 is transparent so that the housed disk 2 can be visually recognized, and a display area is provided on the other main surface for displaying a display of the recorded contents of the disk 2. May be.

[0056]

As described above, according to the disc holder of the present invention, the disc holder is located at the inner peripheral portion of the disc holding opening of the holding frame and is parallel to the loading direction of the recording and / or reproducing apparatus. Providing third and fourth holding portions that are provided so as to be elastically displaceable symmetrically with respect to the center line of the disc, hold the outer peripheral portion of the disc, and have elastic displacement pieces that bias the disc in the radial direction. Thus, the loaded disc can be easily and surely released when loaded in the recording and / or reproducing apparatus.

That is, according to the disc holder, the disc can be reliably stored and can be easily loaded in the recording and / or reproducing apparatus. Therefore, according to this disc holder, when loaded in the recording and / or reproducing apparatus, the signal recording surface of the disc becomes dirty,
It is possible to prevent scratches and damage to the disc.

Further, by providing the disc holder with the positioning hole, when the disc holder is placed on the disc tray, the positioning pin erected on the placing surface of the disc tray is inserted into the positioning hole to be located at a predetermined position. The disc opening pin is mounted easily and surely, and the disc opening pin erected on the mounting surface of the disc tray abuts on the operation piece of the third and fourth holding portions to rock the elastic displacement piece. Therefore, the disc held by the fourth holding portion can be surely opened on the disc tray.

[Brief description of drawings]

FIG. 1 is a perspective view showing a disc holder provided in a disc case according to an embodiment of the present invention.

FIG. 2 is a plan view showing the disc holder.

FIG. 3 is a plan view showing a main part of the disc holder.

FIG. 4 is a perspective view showing an example of a state in which the disc holder is loaded in a recording / reproducing apparatus.

FIG. 5 is a perspective view showing a disc holder according to another embodiment.

FIG. 6 is a plan view showing the disc holder.

FIG. 7 is a perspective view showing a case main body included in the disk case of the embodiment.

FIG. 8 is a perspective view showing a conventional disk case.

[Explanation of symbols]

1 disk holder, 1A holding frame, 2 disks, 4
Case body, 7 holding opening, 9 first holding portion, 10
2nd holding part, 11 3rd holding part, 12 4th holding part

Front page continuation (58) Fields surveyed (Int.Cl. ⁷ , DB name) G11B 23/03 B65D 85/57

Claims (6)

(57) [Claims] 1. A positioning hole having a disk holding opening for holding a disk in a central portion and through which a positioning pin erected on a mounting surface of the disk tray is inserted when mounted on a disk tray. And a holding frame portion having an inner circumference of the disc holding opening of the holding frame portion and symmetrical to each other with respect to the center line of the disc parallel to the loading direction for the recording and / or reproducing apparatus. First and second holding portions that are provided to hold the outer peripheral portion of the disc and the inner peripheral portion of the disc holding opening of the holding frame portion, and are mounted in the loading direction of the recording and / or reproducing apparatus. A third and a third elastically displacing piece that are elastically displaceable symmetrically with respect to the center line of the disk parallel to the disk and that hold the outer peripheral portion of the disk and urge the disk in the radial direction. The third and fourth holding portions are arranged at a side end portion side facing one side end portion facing the loading direction with respect to the recording and / or reproducing apparatus, and the third and fourth holding portions are provided. Each of the third and fourth holding portions has an operation piece in which a base end portion is integrally formed with the elastic displacement piece, and a tip end portion is formed to project in a direction orthogonal to a loading direction for the recording and / or reproducing apparatus. When the third and fourth holding portions are placed on the disc tray, the elastic displacement pieces are elastically displaced through an operation piece with which a disc opening pin erected on the disc tray abuts. A disc holder, wherein the discs held by the first to fourth holding portions are released. 2. A disc mounting portion on which the discs held by the first to fourth holding portions are placed, wherein the disc mounting portion records or reproduces an information signal on or from the disc. 2. The disc holder according to claim 1, further comprising a recording / reproducing opening for performing the recording and reproducing, and a supporting convex portion for supporting a central portion of the disc. 3. The disk holder according to claim 1, wherein engaging recesses are provided on both side surfaces parallel to the loading direction of the recording and / or reproducing apparatus. 4. A positioning hole having a disk holding opening for holding a disk in a central portion and through which a positioning pin erected on a mounting surface of the disk tray is inserted when the disk is mounted on the disk tray. And a holding frame portion having an inner circumference of the disc holding opening of the holding frame portion and symmetrical to each other with respect to the center line of the disc parallel to the loading direction for the recording and / or reproducing apparatus. First and second holding portions that are provided to hold the outer peripheral portion of the disc and the inner peripheral portion of the disc holding opening of the holding frame portion, and are mounted in the loading direction of the recording and / or reproducing apparatus. A third and a third elastically displacing piece that are elastically displaceable symmetrically with respect to the center line of the disk parallel to the disk and that hold the outer peripheral portion of the disk and urge the disk in the radial direction. The third and fourth holding portions are arranged at one end facing the loading direction with respect to the recording and / or reproducing apparatus, and the third and fourth holding portions are provided. Has an operation piece in which a base end portion is integrally formed with the elastic displacement piece, and a tip end portion is formed to project in a direction orthogonal to a loading direction for the recording and / or reproducing apparatus. The portion is elastically displaced by the elastic displacement piece via an operation piece with which a disc opening pin provided upright on the disc tray abuts when mounted on the disc tray, whereby the first to fourth holding portions are held. A disc holder, wherein a disc held by a portion is released. 5. A disc mounting portion on which the discs held by the first to fourth holding portions are placed, wherein the disc mounting portion records or reproduces an information signal on or from the disc. The disk holder according to claim 4, wherein a recording / reproducing opening for performing the recording and reproducing is provided, and a supporting convex portion that supports a central portion of the disk is provided. 6. The disk holder according to claim 4, wherein engaging recesses are provided on both side surfaces parallel to the loading direction of the recording and / or reproducing apparatus.