JP2846190B2 - 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 disk cartridge in which a disk as a recording medium is stored in a cartridge case.

[0002]

2. Description of the Related Art As shown in FIG. 5, a disk cartridge has a shape in which a disk 31 is accommodated in a cartridge case 33. The disk 31 has a fitting hole 31a formed at the center thereof.
An opening 31b is formed in the central part of a. And
A magnet suction plate 32 is fitted into the fitting hole 31a,
Fixed.

On the other hand, the cartridge case 33 is composed of an upper case 33a and a lower case 33b. An opening 33c is formed in the center of the lower case 33b, and a disc stored in the vicinity of the opening 33c. A protection projection 33d for protecting the recording layer 31 is formed.

In order to mount such a disk cartridge in a drive device, a cartridge case 3 is required.
The rotation table 34 of the drive device is inserted into the cartridge case 33 through the opening 33c of the disk 3 and the drive rotation shaft 35 protruding from the center of the rotation table 34 is fitted into the opening 31b of the disk 31 to set the core. Then, the rotary table 34 and the lower surface of the central part of the disk 31 are brought into contact with each other. Since the magnet 36 is fitted to the center of the drive rotation shaft 35, the magnet attraction plate 32 provided at the center of the disk 31 is attracted in a non-contact manner.
The disk 31 is pressed against the rotary table 34 by this suction force and is clamped.

By the way, the role of the magnet attraction plate 32 at the time of such mounting is to press the disk 31 against the rotary table 34 with a magnetic force to stabilize the rotation of the disk 31. Therefore, since it has nothing to do with the alignment at the time of mounting or the centering, etc.
Regarding the attachment of the second to the disk 31, accurate positioning and the like are not required.

Therefore, focusing on this point, cost reduction has been attempted by simplifying the mounting of the magnet attraction plate 32 to the disk 31. However, when attaching the magnet attraction plate 32, the disk 31
In order to stabilize the rotation of the disk, the upper surface portion 32a of the magnet attraction plate 32 is configured to be able to maintain a substantially parallel state with the disk 31, and inside the cartridge case,
It is necessary to provide a configuration in which the magnet attraction plate 32 does not come out of the fitting hole 31a.

Therefore, conventionally, a method of fixing the magnet attraction plate 32 to the fitting hole 31a has been adopted. As a fixing method, for example, as shown in FIG. 6, the magnet attraction plate 32 is formed in a hat shape. As shown in FIG. 7, the flange portion 32b of the hat-shaped magnet attracting plate 32 is fixed to the bottom surface of the fitting hole 31a using an adhesive 37, or by using an ultrasonic processing device. There is a welding method or the like in which a projection 31c is formed on the inner peripheral surface of 31a, and a flange 32b of a hat-shaped magnet suction plate 32 is hooked and fixed to the projection 31c.

[0008]

However, in the above-mentioned conventional structure, the upper surface 3 of the magnet attraction plate 32 is not provided.
In order to keep the disk 2 substantially parallel to the disk 31 or to prevent the magnet attraction plate 32 from coming out of the fitting hole 31a, a method of fixing the magnet attraction plate 32 to the fitting hole 31a is adopted. Therefore, an adhesive 37, an ultrasonic processing device, and the like are required, and there is a problem that cost reduction by simplifying the mounting of the magnet attraction plate 32 is not effectively achieved.

Therefore, the disk cartridge of the present invention has been made in view of the above problems, and has a structure in which the inclination of the magnet attraction plate can be regulated without being fixed to the fitting hole, and the disk cartridge can be prevented from being pulled out. Accordingly, it is an object of the present invention to further simplify the mounting of the magnet attraction plate as compared with the related art, and to effectively reduce the cost by the simplification.

[0010]

According to a first aspect of the present invention, there is provided a disk cartridge, comprising:
In a disc cartridge including a disc in which a concave fitting hole is formed, a magnet suction plate is fitted in the fitting hole, and a cartridge case for accommodating the disc inside, the magnet suction plate is provided at a central portion. Is convex
The outer peripheral part is formed in a hat shape that contacts the bottom surface of the fitting hole.
In addition, a fitting portion is provided upright on the outermost peripheral portion to be fitted in contact with the inner peripheral surface of the fitting hole in the axial direction.

According to a second aspect of the present invention, there is provided a disk cartridge according to the first aspect.
There are, formed so that the maximum value of the axial dimension of the gap between the Katori <br/> Jjikesu formed on the upper surface side of the disk is smaller than the height dimension of the Ma <br/> Gunetto suction plate It is characterized by being.

[0012]

According to the structure of the first aspect of the present invention, the fitting portion is provided upright on the outer peripheral portion of the magnet attraction plate so as to be axially contacted with the inner peripheral surface of the fitting hole. Therefore, the inclination of the magnet attraction plate is regulated by this fitting portion, and the upper surface of the magnet attraction plate and the disk are maintained substantially parallel. Accordingly, the inclination of the magnet attraction plate can be regulated and the upper surface of the magnet attraction plate can be maintained substantially parallel to the disk without fixing the magnet attraction plate to the fitting hole.

According to the second aspect of the present invention, the maximum value of the axial dimension of the gap with the cartridge case formed on the upper surface side of the disk is set smaller than the height of the magnet attraction plate. Since it is formed, even if the magnet attraction plate moves up and down along the fitting hole, there is no possibility that the magnet attraction plate will come out. This makes it possible to prevent the magnet attraction plate from being pulled out without fixing the magnet attraction plate to the fitting hole.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to FIGS.

FIG. 1 shows a disk cartridge according to this embodiment.
As shown in FIG. 1, the cartridge case 3 and the disk 1 housed in the cartridge case 3 are constituted.

The cartridge case 3 is composed of an upper case 3a and a lower case 3b. A central portion of the lower case 3b is provided in the drive device when a disk cartridge is mounted in the drive device (not shown). An opening 3c for allowing a rotary table or the like to contact the disk 1 is formed. Further, in the vicinity of the opening 3c, by supporting a central portion of the disk 1 housed therein, a protection projection 3d for protecting the recording layer of the disk 1 is provided.
Are formed. At the same position on the upper case 3a, protection projections 3d are formed.

The disc 1 has a recording layer (not shown) formed thereon.
The information on the recording layer is read out, or the information is recorded on the recording layer.

At the center of the disk 1, a fitting hole 1a is provided.
Are formed, and a magnet attraction plate 2 described later is fitted into the fitting hole 1a. At the center of the fitting hole 1a, an opening 1b used for centering the disk 1 with the drive device is formed.

The magnet attracting plate 2 inserted into the fitting hole 1a is used to stabilize the rotation of the disk 1 by being magnet-catched by a drive device, and further has a rising portion 2c formed on a flange 2b. It is formed in a hat shape. The rising portion 2c, when inserted into the fitting hole 1a, comes into contact with the inner peripheral surface of the fitting hole 1a in the axial direction, and is the fitting portion of the present invention.
When the rising portion 2c contacts the inner peripheral surface of the fitting hole 1a, the inclination of the magnet attraction plate 2 is regulated, and the upper surface portion 2a of the magnet attraction plate 2 and the disk 1
Are maintained substantially parallel to each other.

Further, as shown in FIG. 2, the disk 1 is in a state where the axial dimension of the gap A formed between the upper surface of the disk 1 and the upper case 3a is maximum, that is,
The maximum value a of the axial dimension a of the gap A when the disk cartridge is placed on a horizontal surface with the lower case 3b facing downward, and the lower surface side of the disk 1 is supported by the above-described protective projections 3d. Are formed so as to be smaller than a height dimension h which is an axial dimension of the magnet attracting plate 2. As a result, as shown in FIG. 3, even if some force is applied from outside to lift the magnet attraction plate 2 upward, the magnet attraction plate 2 is prevented from being pulled out of the fitting hole 1a.

Therefore, the attachment of the magnet attraction plate 2 to the disk 1 in the disk cartridge of the present embodiment does not require an adhesive or an ultrasonic processing device as in the prior art, and is inserted into the fitting hole 1a. Just being done. As a result, the attachment of the magnet attraction plate 2 is simplified as compared with the related art, and the cost can be effectively reduced by the simplification.

In this embodiment, the configuration is such that the inclination of the magnet attraction plate 2 is regulated without fixing the magnet attraction plate 2 to the fitting hole 1a, and the magnet attraction plate 2 is similarly removed without being fixed. By adopting the configuration for preventing the rotation in combination, it is possible to further simplify the mounting by simply inserting the magnet attraction plate 2 into the fitting hole 1a, but only one of the two configurations can be used. Since the mounting can be sufficiently simplified as compared with the related art, the cost can be effectively reduced by the simplification.

In the present embodiment, the shape of the disk 1 is devised so that the maximum value a of the axial dimension of the gap A is smaller than the height h of the magnet attracting plate 2. The height dimension h of the magnet attraction plate 2 may be changed according to the shape of the disk 1.

(Reference Example) Further, in addition to the shape of the present embodiment, the shape of the magnet attraction plate 2 may be, for example, as shown in FIG. 4, the rising portion 2c directly on the upper surface 2a 'of the magnet attraction plate 2'. 'May be provided.

[0025]

As described above, according to the disk cartridge of the first aspect, the magnet attraction plate has a convex central portion,
When the peripheral part is formed in a hat shape that contacts the bottom of the fitting hole,
In addition, a fitting portion is provided upright on the outermost peripheral portion to be fitted in contact with the inner peripheral surface of the fitting hole in the axial direction.

Therefore, the inclination of the magnet attraction plate can be regulated and the upper surface of the magnet attraction plate can be maintained substantially horizontal with respect to the disk without fixing the magnet attraction plate to the fitting hole. This brings about an effect that the mounting of the plate can be simplified as compared with the related art, and the cost can be effectively reduced by the simplification.

According to a second aspect of the present invention, there is provided a disk cartridge according to the first aspect.
In this configuration, the maximum value of the axial dimension of the gap between the cartridge case and the cartridge case formed on the upper surface side is smaller than the height of the magnet attraction plate.

Therefore, it is possible to prevent the magnet attraction plate from being pulled out without fixing the magnet attraction plate to the fitting hole, so that the same effect as that of the first aspect is obtained.

[Brief description of the drawings]

FIG. 1 is a sectional view of a disk cartridge according to an embodiment of the present invention.

FIG. 2 is a sectional view of a main part of the disc cartridge.

FIG. 3 is a sectional view of a main part of the disc cartridge.

FIG. 4 is an explanatory view showing a shape of a magnet attraction plate in a reference example of the present invention.

FIG. 5 is an explanatory diagram in which a conventional disk cartridge is mounted on a drive device.

FIG. 6 is an explanatory diagram illustrating attachment of a magnet attraction plate in a conventional disk cartridge.

FIG. 7 is an explanatory diagram illustrating attachment of a magnet attraction plate in a conventional disk cartridge.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Disc 1a Fitting hole 2 Magnet attracting plate 2 'Magnet attracting plate 2a Upper surface 2b Flange 2c Rising part (fitting part) 2c' Rising part (fitting part) 3 Cartridge case 3a Upper case 3b Lower case

Continuation of front page (58) Field surveyed (Int.Cl. ⁶ , DB name) G11B 23/00 601 G11B 23/03

Claims (2)

(57) [Claims] 1. A disk cartridge comprising: a disk having a concave fitting hole formed in a central portion thereof, a magnet suction plate fitted in the fitting hole, and a cartridge case for accommodating the disk therein. The magnet attracting plate has a convex central part and an upper peripheral part.
It is formed in a hat shape that contacts the bottom of the fitting hole.
A disc cartridge characterized in that a fitting portion is provided upright on the outermost peripheral portion so as to be fitted in contact with the inner peripheral surface of the fitting hole in the axial direction. 2. A maximum value of the axial dimension of the gap between the mosquito <br/> chromatography cartridge case formed on the upper surface side of the disk,
The disc cartridge according to claim 1, wherein the disc is formed to be smaller than the height of the magnet attraction plate.