JPH08195053A - Disk cartridge - Google Patents

Abstract

PURPOSE: To decrease the number of parts and to reduce a cost by composing a chucking member of a metallic sheet to be magnetically attracted by the magnet of a disk rotational driving means and providing its outer peripheral edge with a collar part. CONSTITUTION: The chucking member 9 is formed by constituting two parts; a chucking pulley and an attraction plate, of the conventional member as one part. The chucking member 9 is integrally formed as one part by forging the metallic sheet to be magnetically attracted by the magnet 11 disposed at a chucking holder 6. Then, the member which is heretofore formed as two parts is formed as one part and, therefore, the number of parts is reduced and the production stages are simplified, by which a drastic cost reduction is realized. Since the member is integrally formed by forging, the member having high mechanical strength and high reliability is obtd.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disc cartridge in which a disc-shaped recording medium such as an optical disc or a magneto-optical disc in which music information or image information is written is rotatably accommodated in a cartridge body.

[0002]

2. Description of the Related Art For example, a reproduction-only optical disc,
A so-called CD-ROM is handled as a disk cartridge housed in the cartridge body in order to prevent dust from adhering to the disk and to improve handling.

As such a disk cartridge, for example, as shown in FIG. 3, an upper case 101 and a lower case 10 are provided.
2 and a recording disk 10 that is a CD-ROM in the cartridge body 103.
4 is rotatably housed. In particular, this disc cartridge is a so-called CD-ROM in which the upper case 101 can be opened and closed with respect to the lower case 102.
It is considered a caddy.

A circular center hole 109 is formed in the center of the recording disk 104 so as to face the centering member 106 of the disk rotation driving means 105 and the chucking mag holder 108 provided with the magnet 107. There is. Then, in this recording disk 104,
A chucking pulley 111 is provided for pressing the recording disk 104 against the disk pulley 110 during chucking for mounting the disk cartridge in the reproducing apparatus for reproduction.

The chucking pulley 111 is formed, for example, by injection-molding a resin material. The chucking pulley 111 closes the center hole 109 of the recording disk 104 and is located on the opposite side of the disk rotation driving means 105. It is located on the main surface. And this chucking pulley 111
An attraction plate 112, which is magnetically attracted by a magnet 107 provided on a chucking mag holder 108, is fitted in the.

The attracting plate 112 is made of a disk-shaped metal plate having a diameter larger than the opening diameter of the center hole 109 of the recording disk 104, and is fixed by fitting a claw into the chucking pulley 111. Further, the outer peripheral edge portion of the chucking pulley 111 is formed with a flange portion 113 for supporting the recording disc 104 with respect to the upper case 101 during non-chucking when the disc cartridge is not mounted in the reproducing apparatus. .

The upper case 101 and the lower case 102 constitute a cartridge body 103 which forms a space enough to rotatably accommodate the recording disk 104, and is attached to the lower case 102 so as to be openable and closable. ing. In the upper case 101, a recording disk 104 is attached to the upper case 101 or the lower case 102 when chucking when the disk cartridge shown in FIG.
A circular opening 114 for accommodating the chucking pulley 111 is formed in order to secure a stroke required to be lifted up to a position where the chucking pulley 111 is not touched. A locking portion 115 that holds the recording disk 104 by engaging with the flange portion 113 of the chucking pulley 111 during non-chucking is formed on the peripheral portion of the opening 114.

Further, the opening 1 is formed in the upper case 101.
A decorative plate 116 made of a metal plate is attached so as to close 14. The decorative plate 116 is provided to prevent the chucking pulley 111 from coming off the upper case 101.

On the other hand, the lower case 102 is the upper case 101.
Is formed as a casing having a flat rectangular shape without a top plate which forms a space enough to rotatably accommodate the recording disk 104 therein. This lower case 10
A circular disk rotation driving means insertion hole 117 for exposing the disk rotation driving means 105 inside the cartridge main body 103 is formed on the bottom surface of 2.

On the bottom surface of the lower case 102, a disk support portion 118 for supporting the recording disk 104 during non-chucking is formed. The disc supporting portion 118 is formed as an annular protrusion on the peripheral edge of the disc rotation driving means insertion hole 117.

The non-chucking state and the chucking state of the disk cartridge configured as described above are as follows. In the non-chucking state,
As shown in FIG. 3, the recording disc 104 is supported by the disc supporting portion 118 of the lower case 102, and the flange portion 113 of the chucking pulley 111 is engaged and supported by the locking portion 115 provided on the upper case 101. . In the chucking state, the rotation center of the spindle shaft 119 and the rotation center of the recording disk 104 are matched by the centering member 106 provided facing the center hole 109 of the recording disk 104, and the attraction plate 112 is magnetically attracted by the magnet 107. By doing so, the recording disk 104 is fixed to the disk pulley 110. In this state, the recording disk 104 is the cartridge body 1
03, and the flange 113 of the chucking pulley 111 is also non-contact with the locking portion 115.

[0012]

By the way, the chucking pulley 111 and the suction plate 112 in the disk cartridge having such a structure are composed of two parts, which are a resin molded body and sheet metal processing, and are integrated by a fitting method. ing.

Thus, the chucking pulley 111
If the suction plate 112 has two parts, not only the number of parts and the process of manufacturing each part increase, but also the work of assembling these two parts increases, which inevitably increases the cost.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a disk cartridge of high industrial value, which has a small number of parts and can be manufactured at a low cost in order to solve the above-mentioned technical problems.

[0015]

DISCLOSURE OF THE INVENTION In a disk cartridge according to the present invention, in order to reduce the number of parts and achieve cost reduction, a disk-shaped recording medium having a circular central hole in the central portion and a brim at the outer peripheral edge portion. And a chucking member made of a metal plate disposed on one main surface of the disc-shaped recording medium so as to close the central hole of the disc-shaped recording medium, and a chucking member for the non-chucking member. Supports the disc-shaped recording medium by engaging with the brim,
An upper case having a locking portion that is not in contact with the brim portion during chucking, and an opening facing a disk rotation driving means for rotating the disk recording medium by magnetically attracting the chucking member with a magnet, An upper case and a lower case that rotatably accommodates the disk-shaped recording medium are provided. The chucking member will be integrated by forging.

[0016]

In the disk cartridge according to the present invention, the chucking member provided so as to close the central hole of the disk-shaped recording medium is made of a metal plate which is magnetically attracted by the magnet of the disk rotation driving means. Since the brim portion that engages with the locking portion provided on the upper case is provided on the outer peripheral edge portion of the member, the conventional suction plate and the chucking pulley are made into two parts, which reduces the number of parts. The number of manufacturing processes can be reduced. Further, since the chucking member is integrally formed by forging, it has high rigidity and reliability is improved.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Specific embodiments to which the present invention is applied will be described in detail below with reference to the drawings. In this embodiment,
This is an example of a CD-ROM caddy in which an upper case can be freely opened and closed with respect to a lower case which constitutes a cartridge main body, and a disk-shaped recording medium housed therein can be taken in and out.

As shown in FIG. 1, such a CD-ROM caddy is a recording disk 1 which is a disk-shaped recording medium.
And a cartridge body 4 including an upper case 2 and a lower case 3 for rotatably housing the recording disk 1.

As the recording disk 1, any disk-shaped recording medium such as an optical disk, a magneto-optical disk or a magnetic disk in which music information or image information is written is used. The recording disk 1 is formed as a disk having a circular center hole 8 facing the chucking mag holder 6 and the centering member 7 of the disk rotation driving means 5.

The main surface 1a of the recording disk 1 is
A chucking member 9 made of a metal plate is arranged so as to close the central hole 8. The chucking member 9 serves to press the recording disc 1 against the disc pulley 10 which is a turntable during chucking.

The chucking member 9 is composed of the conventional chucking pulley shown in FIG. 3 and the attraction plate as two components, and is a metal that is magnetically attracted by the magnet 11 provided in the chucking magnet holder 6. The plate is forged and integrally formed as one component. Therefore, since the conventional two parts are made into one part, the number of parts can be reduced and the manufacturing process can be simplified to realize a large cost reduction. Further, since it is integrally formed by forging, it has high mechanical strength and is excellent in terms of reliability.

The chucking member 9 has substantially the same outer shape as that of a conventional suction plate attached to a chucking pulley, and is large enough to close the center hole 8 of the recording disk 1 and has a central portion. It is formed as a slightly protruding disk body. A flange portion 12 for supporting the recording disk 1 with respect to the upper case 2 during non-chucking is formed on the outer peripheral edge of the chucking member 9. The brim portion 12 has a smaller thickness than other portions in order to easily engage with the locking portion 13 provided on the upper case 2.

The chucking member 9 is made of a material having as high a magnetic permeability as possible so that the recording disk 1 can be securely fixed to the disk pulley 10 by magnetic attraction with the magnet 11. For example, a material such as pure iron or a steel plate may be used.

The upper case 2 and the lower case 3 constitute a cartridge body 4 which forms a space enough to rotatably accommodate the recording disk 1, and is attached to the lower case 3 so as to be openable and closable. ing. A circle in which the chucking member 9 is housed in the upper case 2 in order to secure a stroke required to lift the recording disc 1 to a position where it does not contact the upper case 2 or the lower case 3 during chucking shown in FIG. An opening 14 having a shape is formed. The periphery of the opening 14 is engaged with the collar 12 of the chucking member 9 during non-chucking,
A locking portion 13 that holds the chucking member 9 is formed.

A decorative plate 15 made of sheet metal is attached to the upper case 2 so as to close the opening 14. The decorative plate 15 is provided to prevent the chucking member 9 from coming off the upper case 2, and is fitted and fixed in a groove formed in the upper case 2. Therefore, when the upper case 2 is opened with respect to the lower case 3, the chucking member 9 is also lifted together with the upper case 2.

On the other hand, the lower case 3 is formed by the upper case 2 as a flat rectangular housing without a top plate which forms a space enough to rotatably accommodate the recording disk 1. There is. The bottom surface of the lower case 3 has a circular disk rotation driving means insertion hole 16 for allowing the disk rotation driving means 5 to face the inside of the cartridge body 4.
Has been established.

A disc support portion 17 for supporting the recording disc 1 at the time of non-chucking is formed on the bottom surface of the lower case 3. The disc support portion 17 is formed as an annular protrusion protruding into the cartridge body 4 at the peripheral edge portion of the disc rotation driving means insertion hole 16.

The disk rotation driving means 5 comprises a chucking mag holder 6 fixed to the tip of a spindle shaft 18 of a spindle motor, a centering member 7, and a disk pulley 10.

The chucking mug holder 6 faces the center hole 8 of the recording disk 1 during chucking shown in FIG.
Magnetically attract the chucking member 9 to the disc pulley 1
It has a role of fixing to 0, and has a shape in which a magnet 11 is embedded in one principal surface having a substantially disc shape. The chucking mag holder 6 is fixed to the tip of the spindle shaft 18 and rotates together with the spindle shaft 18. Further, a tapered flange portion 19 is provided on the outer peripheral edge of the chucking mag holder 6. The tip portion of the flange portion 19 comes into contact with the inner wall surface of the opening of the center hole 8 of the recording disk 1 to perform an auxiliary function of centering the recording disk 1.

The centering member 7 has a spindle shaft 18
The center of rotation of the recording disk 1 and the center of rotation of the recording disk 1 are made to coincide with each other, and a compression coil spring 20 is constantly urged between the chucking mag holder 6 and the disk pulley 10 toward the chucking mag holder 6 side. It is attached to the spindle shaft 18. The centering member 7 is configured to perform centering by bringing the inclined surface 21 of the protruding portion formed in an annular shape on the outer peripheral edge of the disk body into contact with the opening edge portion of the center hole 8 of the recording disk 1. There is.

The disc pulley 10 is a recording disc 1
Is mounted on the spindle shaft 18 and is rotated together with the spindle shaft 18. The disc pulley 10 is a cylindrical body having a size capable of accommodating the centering member 7, and has a ring-shaped disc mounting portion 22 at the peripheral edge of the opening. The disc mounting portion 22 is formed in such a size that it can face the disc rotation driving means insertion hole 16 formed in the lower case 3 and that the recording disc 1 can rotate stably without shaking. .

Next, a chucking state in which the disc cartridge configured as described above is mounted in the reproducing apparatus and a non-chucking state in which it is not mounted will be described.

In the non-chucking state, as shown in FIG. 1, the recording disc 1 has the disc supporting portion 1 of the lower case 3.
It is in a state of being supported by 7. Further, the chucking member 9 is attached to the locking portion 13 of the upper case 2 by the chucking member 9.
Since the brim portion 12 is supported, the collar portion 12 is held by the upper case 2.

In the chucking state, as shown in FIG. 2, the inclined surface 21 of the centering member 7 is placed on the recording disk 1.
Contact the opening edge of the central hole 8 of the spindle shaft 1
The center of rotation of the recording disk 1 and the center of rotation of the recording disk 1 coincide with each other. Further, the chucking member 9 is magnetically attracted by the magnet 11 embedded in the chucking mag holder 6, and the attracting force of the chucking member 9 causes the recording disc 1 to be placed on the disc mounting portion 22 of the disc pulley 10.
It is placed in a state of being pressed against. That is, the recording disk 1 is sandwiched between the chucking member 9 and the disk pulley 10.

At this time, in this embodiment, since the chucking member 9 is integrally formed as one component by the metal plate attracting to the magnet instead of two components of the resin and the metal plate, the resin component is eliminated. Also, since the distance from the magnet 11 is shortened, the leakage magnetic flux is reduced, the attracting force is increased, and the fixing force of the recording disc 1 to the disc pulley 10 is significantly increased. Further, the recording disc 1 and the chucking member 9 are lifted by the disc pulley 10 so that they are not in contact with the cartridge body 4. When the spindle shaft 18 rotates in this state, the recording disk 1 also rotates, and the information written on the recording disk 1 is read by the optical pickup device of the reproducing apparatus.

The operation from the non-chucking state to the chucking state will be briefly described. First, from the non-chucking state to the chucking mug holder 6 shown in FIG.
Faces the central hole 8 of the recording disk 1, and the recording disk 1 is centered to some extent by the tip of the flange portion 19 of the chucking mag holder 6.

Then, the inclined surface 21 of the centering member 7
The contact with the opening edge portion of the central hole 8 of the recording disk 1 ensures the centering. When centering is performed, the chucking member 9 is attracted to the disc pulley 10 side by the magnet 11, and the magnetic attraction force between the magnet 11 and the chucking member 9 fixes the recording disc 1 to the disc pulley 10. Thereafter, as shown in FIG. 2, the recording disk 1 is lifted up by the disk pulley 10 to a position where it does not contact the cartridge body 4. In this state, the rotation of the spindle shaft 18 causes the recording disk 1 to rotate.

The specific embodiments to which the present invention is applied have been described above, but the present invention is not limited to the above-described embodiments, and various modifications can be made. For example, in this embodiment, a CD-ROM in which the upper case is freely openable and closable with respect to the lower case as a cartridge body for accommodating a recording disk
Although a caddy is used, a similar effect can be obtained even with a cartridge in which the upper case and the lower case cannot be opened and closed.

[0039]

As is apparent from the above description, in the disk cartridge according to the present invention, what has been integrated by fitting the two parts of the resin part and the metal part up to now is magnetically attracted by the magnet. Since it is integrally formed as one component by a metal plate made of a steel plate or the like, it is possible to reduce the number of components and the manufacturing process. Therefore, a significant cost reduction can be achieved, and an inexpensive disk cartridge can be provided. Further, since the chucking member is integrally formed by forging, the rigidity is high and the reliability can be enhanced by improving the mechanical strength.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a disc cartridge to which the present invention is applied, showing a non-chucking state.

FIG. 2 is a cross-sectional view showing a chucking state, showing a disk cartridge to which the present invention is applied.

FIG. 3 is a cross-sectional view showing a conventional disc cartridge in a non-chucking state.

FIG. 4 is a cross-sectional view showing a chucking state of a conventional disc cartridge.

[Explanation of symbols]

 1 recording disk 2 upper case 3 lower case 4 cartridge body 5 disk rotation driving means 6 chucking mag holder 7 centering member 8 center hole 9 chucking member 10 disk pulley 12 flange part

Claims (2)

[Claims] 1. A disc-shaped recording medium having a circular center hole in the center, and a flange portion at an outer peripheral edge portion of the disc-shaped recording medium so as to close the center hole of the disc-shaped recording medium. A chucking member made of a metal plate disposed on one main surface, and a non-chucking member that engages with the brim portion of the chucking member to support the disk-shaped recording medium and is not in contact with the brim portion during chucking. An upper case having a locking portion and an opening facing a disk rotation driving means for rotating the disk recording medium by magnetically attracting a chucking member with a magnet, and rotating the disk recording medium by the upper case. A disk cartridge that includes a lower case that can be stored freely. 2. The disk cartridge according to claim 1, wherein the chucking member is integrally formed by forging.