JP3458504B2 - 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 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 sometimes used in a bare state, but in order to prevent dust from adhering to a disc and to improve handling, there is also a so-called CD-ROM that is handled as a disc cartridge housed in a cartridge body. .

As such a disk cartridge, for example, as shown in FIG. 6, 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.

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 for pressing the recording disk 104 against the disk pulley 110, which is a turntable, is provided when 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 portion of the chucking pulley 111 is formed with a flange portion 113 for supporting the chucking pulley 111 with respect to the upper case 101 during non-chucking when the disc cartridge is not mounted in the reproducing apparatus. There is.

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 this upper case 101, a recording disc 104 is chucked when the disc cartridge shown in FIG.
In order to secure a stroke required to be lifted up to a position where the chucking pulley 111 is not touched, a gap 114 for accommodating the chucking pulley 111 is formed.

The gap 114 is formed on the collar portion 11 of the chucking pulley 111 during non-chucking as shown in FIG.
A chucking pulley pressing member 116, which has a substantially disk shape and has a locking portion 115 that engages with 3, is attached to the inner wall surface of 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, FIG.
As shown in FIG. 3, the recording disk 104 is supported by the disk supporting portion 118 of the lower case 102. On the other hand, the chucking pulley 111 is the chucking pulley holding member 1.
The 16 brim portions 113 are engaged with and supported by the engaging portions 115 provided on the chucking pulley 111.

In the chucking state, as shown in FIG. 7, the spindle shaft 11 is moved by the centering member 106 provided facing the center hole 109 of the recording disk 104.
The rotation center of 9 and the rotation center of the recording disk 104 are made to coincide with each other, and the attraction plate 1 is made by the magnet 107.
12 is magnetically attracted to the recording disk 104.
Are fixed to the disc pulley 110. In this state, the recording disk 104 is not in contact with the cartridge body 103, and the chucking pulley 11
The first collar 113 is also not in contact with the locking portion 115.

[0013]

In the above-mentioned disc cartridge, since it is necessary to attach the label 120 to the surface of the upper case 101, the chucking pulley holding member 116 for holding the chucking pulley 111 is placed above. It is attached to the inner wall surface of the case 101.

In order to make the label area large, it is necessary to reduce the thickness of the upper case 101 and the chucking pulley pressing member 116. However, since the facing distance E between the inner wall surface of the upper case 2 and the flange portion 113 of the chucking pulley 111 is predetermined, the upper case 101 and the chucking pulley holding member 11 are
The thickness of 6 cannot be reduced. If it were made thin, it would be difficult to fix the chucking pulley holding member 116 to the upper case 101.

To assemble this disc cartridge, first, the chucking pulley 111 is assembled in the upper case 101, and then the chucking pulley pressing member 116 is fixed to the upper case 101 with an adhesive or the like.
As a result, the chucking pulley 111 is held by the chucking pulley pressing member 116. next,
The recording disk 104 is placed on the lower case 102. Finally, the lower case 102 is assembled to the upper case 101 to form a disk cartridge.

Thus, the chucking pulley 111
Is a dedicated chucking pulley holding member 11
Since it is held by 6, the number of parts and the number of assembly steps are large, and the work is troublesome.

Therefore, in order to solve the above-mentioned conventional technical problems, the present invention provides a disk cartridge which can secure a large label area, reduce the number of parts, and can be easily assembled. With the goal.

[0018]

Disc cartridge according to the present invention According to an aspect of the disc-shaped recording medium, and the chucking member recess of the disc-shaped recording medium is placed on the central portion is not provided, the disc a cartridge body consisting of an upper case and a lower case for rotatably accommodating Jo recording medium, perpendicular to the inner wall surface so as to surround the outer peripheral edge portion of the chucking member to the inner wall surface of the upper case It has a protrusion and is on top of the non-chucking
The opposing distance between the tip and the disc-shaped recording medium of the serial protrusions, by less than the vertical distance from the disc-shaped recording medium to the upper end surface of the outer peripheral edge portion of the chucking member, the at non chucking the outer peripheral edge portion of the chucking member and can come into contact with the protruding portions, together with the chucking member is prevented from popping from the region surrounded by the protruding portion, the chucking member, integral metal plate
It is processed, and the chucking member and the
Coating material on the part that contacts the disk-shaped recording medium
Is applied .

Further, a rib for restricting the position of the disk-shaped recording medium is formed on the inner wall surface of the upper case so as to surround the disk-shaped recording medium and perpendicular to the inner wall surface.

[0020]

[0021]

In the disk cartridge according to the present invention, a protrusion perpendicular to the inner wall surface of the upper case is provided on the inner wall surface of the upper case so as to surround the outer peripheral edge portion of the chucking member. Since the facing distance between the tip of the disk-shaped recording medium and the tip of the disk-shaped recording medium is shorter than the vertical distance from the disk-shaped recording medium to the upper end surface of the outer peripheral edge of the chucking member, the chucking member should be removed from this protrusion. There is no. Further, since the protrusion for holding and regulating the position of the chucking member is formed integrally with the upper case, a dedicated part for holding the chucking member is not required, the number of parts can be reduced, and a large label can be obtained. Area can be secured. Furthermore, the chucking member
Is formed by integrally processing a metal plate, and is a chucking member.
Coating material on the part where the disk-shaped recording medium contacts
The surface of the disc-shaped recording medium was damaged by applying
Prevent

Further, since the upper case is formed with a rib perpendicular to the inner wall surface so as to surround the area where the disk-shaped recording medium is provided, the rib is provided in the area surrounded by the rib. The position of the disk-shaped recording medium is regulated by this rib.

[0023]

[0024]

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.

The disk cartridge of this embodiment is shown in FIG.
As shown in FIG. 1, the recording disk 1 is a disk-shaped recording medium, and the cartridge body 4 is composed of 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, a magnetic disk, etc., in which music information, image information, etc. are written is used. In this embodiment, a digital video disc in which music information and image information are written is used.

The recording disk 1 includes a chucking mag holder 6 which constitutes the disk rotation driving means 5.
A circular center hole 8 facing the centering member 7
It is formed as a disk having.

The main surface 1a of the recording disk 1 is
A chucking member 9 that is magnetically attracted by the magnet 11 is provided 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 a chucking pulley 9a made of a resin molding and a suction plate 9b made of a metal plate.

The chucking pulley 9a is formed as a substantially disk body having a size sufficient to close the central hole 8 of the recording disk 1, and is mounted on the one main surface 1a of the recording disk 1. A brim portion 12 is formed on the outer peripheral edge of the chucking pulley 9a so as to project outward.

The suction plate 9b is provided in the center hole 8 of the recording disk 1.
It is formed as a larger disk and is fitted into the chucking pulley 9a. A material having as high a magnetic permeability as possible is selected for the attraction plate 9b in order to securely fix the recording disk 1 to the disk pulley 10 by magnetic attraction. For example, a material such as pure iron or a steel plate may be used.

The upper case 2 constitutes a cartridge body 4 which, together with the lower case 3, forms a space enough to rotatably accommodate the recording disk 1, and has a flat rectangular casing without a bottom plate. Is formed as. The upper case 2 is formed with a protrusion 13 for accommodating and holding the chucking member 9 and restricting its position. The protrusion 13 is formed as an annular protrusion that surrounds the chucking member 9 on the inner wall surface 2a of the upper case 2 and is perpendicular to the inner wall surface 2a. In this example, the projection 13 is formed in an annular shape, but if the position of the chucking member 9 can be regulated, it may be a comb-like shape in which parts of the annular portion are cut out, or there may be projections in places. Any shape is acceptable.

Further, the height of the protrusion 13 is such that the facing distance D between the tip of the protrusion and the one main surface 1a of the recording disk 1 at the time of non-chucking shown in FIG. It is shorter than C. That is, the relationship is C> D. The height dimension C of the chucking member 9 here
Is the vertical distance from the one main surface 1a of the recording disk 1 to the upper end surface of the flange portion 12 of the chucking pulley 9a.

By defining the height of the protrusion 13 in such a relationship, the collar portion of the chucking pulley 9b can be moved even when the cartridge body 4 is moved in the direction of arrow X in FIG. 1 during non-chucking. 12 is prevented from coming into contact with the protrusion 13 having an annular shape and jumping out of the region surrounded by the protrusion 13.

Further, on the inner wall surface 2a of the upper case 2, a rib 2 perpendicular to the inner wall surface 2a is formed so as to surround a region outside the projection 13 and on which the recording disk 1 is provided.
1 is formed. The ribs 21 are provided up to a position close to the inner wall surface of the lower case 3 to regulate the position of the recording disk 1. Therefore, even when the cartridge body 4 also moves in the direction of the arrow X in FIG. 1, the outer peripheral edge portion of the recording disk 1 comes into contact with the rib 21 and the recording disk 1 may pop out from the area surrounded by the rib 21. To be prevented.

A label 23 is attached to the surface 2b of the upper case 2 opposite to the inner wall surface 2a on which the projection 13 is formed. The label area where the label 23 is provided can be provided as a sufficiently wide range up to the position corresponding to the portion where the chucking member 9 is provided. This is because the protrusion 13 is integrally formed on the upper case 2, so that the conventional locking portion is not required, and the thickness of the upper case 2 can be increased by the thickness of the locking portion. Because.

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. On the bottom surface of the lower case 3, there is formed a circular disk rotation driving means insertion hole 14 for allowing the disk rotation driving means 5 to face the inside of the cartridge body 4.
Has been established.

On the bottom surface of the lower case 3, there is formed a disk support portion 15 for supporting the recording disk 1 during non-chucking. The disk supporting portion 15 is formed as an annular projection protruding into the cartridge body 4 at the opening peripheral edge portion of the disk rotation driving means insertion hole 14. It should be noted that the facing distance from the chucked disk supporting portion 15 to the other surface 1b of the recording disk 1 in FIG. 2 is A, and the facing distance from the tip of the protrusion 13 to the one main surface 1a of the recording disk 1 is B. Then, the above relationship of C> D becomes a relationship of C> D = A + B.

The disk rotation driving means 5 comprises a chucking mag holder 6 fixed to the tip of a spindle shaft 16 of a spindle motor, a centering member 7, and a disk pulley 10.

The chucking mag holder 6 serves to fix the recording disc 1 to the disc pulley 10 by magnetically adsorbing the adsorption plate 9b facing the center hole 8 of the recording disc 1 at the time of chucking shown in FIG. The magnet 11 is embedded in one main surface having a substantially disc shape. The chucking mag holder 6 is fixed to the tip of a spindle shaft 16 and rotates together with the spindle shaft 16. Further, a tapered flange portion 17 is provided on the outer peripheral edge portion of the chucking mag holder 6. The tip portion of the flange portion 17 comes into contact with the inner wall surface of the opening of the central hole 8 of the recording disk 1 to perform an auxiliary function of centering the recording disk 1.

The centering member 7 includes a spindle shaft 16
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 the compression coil spring 18 always urges the chucking magnet holder 6 and the disk pulley 10 toward the chucking magnet holder 6 side. It is attached to the spindle shaft 16.

The centering member 7 performs centering by bringing the inclined surface 19 of the protrusion formed in a circular ring shape on the outer peripheral edge of the disk body into contact with the opening edge of the central hole 8 of the recording disk 1. It has become.

The disc pulley 10 is the recording disc 1.
Is mounted on the spindle shaft 16 and is rotated together with the spindle shaft 16. The disc pulley 10 is a cylindrical body having a size such that the centering member 7 can be housed therein, and has a ring-shaped disc mounting portion 20 at the peripheral edge portion of the opening. The disc mounting portion 20 is formed in such a size that it can face the disc rotation driving means insertion hole 14 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.
The recording disk 1 is supported by the chucking member 5, and the chucking member 9 is placed on the one main surface 1a of the recording disk 1. At this time, the chucking member 9 is in a state in which the position of the chucking member 9 is regulated by the protrusion 13 of the upper case 2.

In the chucking state, as shown in FIG. 2, the inclined surface 19 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 6 and the center of rotation of the recording disk 1 are brought into the centering state. In addition, the attraction plate 9b is magnetically attracted by the magnet 11 embedded in the chucking mag holder 6, and the attraction force causes the recording disc 1 to be recorded.
Is mounted while being pressed against the disk mounting portion 20 of the disk pulley 10. 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 16 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 center hole 8 of the recording disk 1, and the recording disk 1 is centered to some extent by the tip of the flange portion 17 of the chucking mag holder 6.

The inclined surface 19 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 16 causes the recording disk 1 to rotate.

Next, a method of manufacturing the disc cartridge having the above-mentioned structure will be described. First, FIG.
As shown in (a), the upper case 2 is placed with its opening side facing upward, and the chucking member 9 is dropped into the annular projection 13 formed on the upper case 2.

Next, as shown in FIG. 3B, the recording disk 1 is dropped into the annular rib 21 also formed on the upper case 2. Finally, as shown in FIG. 3C, the lower case 3 is attached to the upper case 2 to form the cartridge body 4, and the disc cartridge is completed.

As described above, by using the upper case 2 in which the protrusion 13 for holding the chucking member 9 and the rib 21 for holding the recording disk 1 are formed perpendicularly to the inner wall surface 2a of the upper case 2, The disk cartridge can be assembled only from the same direction without changing the above. Further, the chucking member 9 and the recording disk 1 can be assembled simply by dropping them into the upper case 2, and furthermore, the assembly can be carried out without requiring a dedicated part for holding the chucking member 9, so that it is a simple operation. It can be easily assembled by anyone.

In the above embodiment, the chucking member 9 is composed of two parts, the chucking pulley 9b made of a resin molding and the suction plate 9a made of a metal plate.
You may make it use the thing integrally formed by the metal plate which sticks to the magnet 11.

For example, as shown in FIGS. 4 and 5, the chucking member 9 has substantially the same outer shape as the chucking member 9 shown in FIG. Form as a body. Then, the outer peripheral edge portion is bent vertically to form a so-called tray shape with a shallow bottom. For making the chucking member 9 integrally, a method by a forging process can be mentioned. Of course, this chucking member 9
Even if, the above-mentioned relationship of C> D (= A + B) is satisfied.

As described above, by making two parts into one part in the related art, 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.

[0054]

As is apparent from the above description, in the disc cartridge according to the present invention, the inner wall surface of the upper case surrounds the outer peripheral edge portion of the chucking member and is perpendicular to the inner wall surface. By providing a protrusion and making the facing distance between the tip of the protrusion and the disc-shaped recording medium during non-chucking shorter than the vertical distance from the disc-shaped recording medium to the upper end surface of the outer peripheral edge of the chucking member. The non-chucking allows the outer peripheral edge of the chucking member to come into contact with the projection, and prevents the chucking member from jumping out of the area surrounded by the projection. Can be regulated. Further, since the protrusion is formed integrally with the upper case, a dedicated part for holding the chucking member is not required, the number of parts can be reduced, and a large label area can be secured. Moreover, the chucking member is formed by integrally processing the metal plate.
The chucking member comes into contact with the disk-shaped recording medium.
Since the coating material is applied to the part, it has a disk shape.
It is possible to prevent scratches on the surface of the recording medium and protect the disc-shaped recording medium.

[0055]

As is apparent from the above description, in the disc cartridge according to the present invention, the inner wall surface of the upper case surrounds the outer peripheral edge portion of the chucking member and is perpendicular to the inner wall surface. By providing a protrusion and making the facing distance between the tip of the protrusion and the disc-shaped recording medium during non-chucking shorter than the vertical distance from the disc-shaped recording medium to the upper end surface of the outer peripheral edge of the chucking member. The non-chucking allows the outer peripheral edge of the chucking member to come into contact with the projection, and prevents the chucking member from jumping out of the area surrounded by the projection. Can be regulated. Further, since the protrusion is formed integrally with the upper case, a dedicated part for holding the chucking member is not required, the number of parts can be reduced, and a large label area can be secured.

[0056]

[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 manufacturing process of a disc cartridge to which the present invention is applied.

FIG. 4 is a cross-sectional view showing a disc cartridge in which a chucking member is integrally formed of a metal plate and showing a non-chucking state.

FIG. 5 is a sectional view showing a chucking state of a disk cartridge in which a chucking member is integrally formed of a metal plate.

FIG. 6 is a sectional view showing a conventional disc cartridge in a non-chucking state.

FIG. 7 is a cross-sectional view showing a chucking state of a conventional disc cartridge.

[Explanation of symbols]

1 recording disc 2 upper case 3 lower case 4 Cartridge body 5 Disk rotation drive means 6 chucking mug holder 7 Centering member 8 central hole 9 Chucking member 10 disc pulley 11 magnets 13 Projection 16 spindle axis 21 ribs 23 labels

─────────────────────────────────────────────────── ─── Continuation of the front page (56) Reference JP-A-5-54584 (JP, A) JP-A-4-324176 (JP, A) JP-A-6-111518 (JP, A) JP-A-62-1 145587 (JP, A) JP-A-5-334835 (JP, A) (58) Fields investigated (Int.Cl. ⁷ , DB name) G11B 23/03 601 G11B 23/03 607

Claims (2)

(57) [Claims] 1. A and the disk-shaped recording medium, and the chucking member recess of the disc-shaped recording medium is placed on <br/> center is not provided, rotatably housing the disc-shaped recording medium comprising an upper case and a cartridge body consisting of the lower case that has a vertical protrusion against the inner wall surface so as to surround the outer peripheral edge portion of the chucking member to the inner wall surface of the upper case, Noncha' Top and top of the above protrusion when king
The opposing distance between the serial disk-shaped recording medium, by less than the vertical distance from the disc-shaped recording medium to the upper end surface of the outer peripheral edge portion of the chucking member, the outer peripheral edge of the chucking member during non chucking the parts to allow contact with the collision <br/> electromotive unit, together with the chucking member is prevented from popping from the region surrounded by the protruding portion, the chucking member is obtained by integrally forming a metal plate
The chucking member and the disk-shaped recording medium
A disc cartridge characterized in that a coating material is applied to a portion in contact with the body . 2. A disk cartridge according to claim 1, wherein the inner wall surface of the upper case so as to surround the disk-shaped recording medium, characterized in that it is formed perpendicular ribs with respect to the inner wall surface.