JP2000339901A - Disk cartridge - Google Patents

Abstract

PROBLEM TO BE SOLVED: To allow a disk-shaped recording medium to be cleaned while realizing a stable rotation of the disk-shaped recording medium to be rotated at a high speed. SOLUTION: A disk cartridge includes a cartridge main body for rotatably accommodating a magnetic disk, adhesion sections 54 each provided on one surface with a non-ventilating heat-sensitive adhesion layer that is adhered onto an inner surface of the cartridge main body, and a non-adhesion section 56 separatable from the inner surface of the cartridge main body. The disk cartridge is further provided with liners 49 respectively provided onto the opposing inner surfaces of the cartridge main body so as to interpose the magnetic disk therebetween. The liners 49 are disposed to be cut into the opposing inner surfaces of the cartridge main body at interface sections between the adhesion sections 54 and the non-adhesion section 56.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disk cartridge for accommodating a disk-shaped recording medium such as a magnetic disk provided with a center core for clamping to a rotary drive mechanism at the center, and more particularly to a disk-shaped recording medium. The present invention relates to an apparatus having a liner for protecting a disk-shaped recording medium provided on an inner surface of a cartridge body containing a medium.

[0002]

2. Description of the Related Art Conventionally, a disk cartridge is used in which a magnetic disk having a magnetic layer formed on a flexible disk substrate is rotatably housed in a cartridge body formed by joining a pair of upper and lower halves together. .

In this disk cartridge, liners made of nonwoven fabric or the like are disposed on the inner surfaces of the upper and lower halves constituting the cartridge main body in order to clean the magnetic disk housed in the cartridge main body and protect the magnetic disk. . A part of the liner disposed on the inner surface side of the upper half is lifted to the magnetic disk side by a plurality of ridges formed in a comb-like shape on the inner surface of the upper half. Also, the liner arranged on the inner side of the lower half is
A part of the lower half is lifted to the magnetic disk side by a lifter formed by a thin leaf spring disposed on the inner surface side of the lower half so as to face the ridge provided on the upper half. That is, the liners provided on the inner surfaces of the upper and lower halves are partially bulged in the direction approaching each other by the ridges and the lifters, and the bulged portions contact the signal recording surface of the magnetic disk. It has been made to be.

When the magnetic disk mounted on the disk recording / reproducing apparatus and the magnetic disk housed in the cartridge body is clamped by a disk rotation driving mechanism provided on the disk recording / reproducing apparatus and is rotationally driven, The swollen portion of the liner comes into contact with the rotating magnetic disk to remove dust attached to the magnetic disk.

[0005] The portion of the liner having a large area other than the bulging portion prevents the signal recording surface of the magnetic disk from directly contacting the inner surface of the highly rigid cartridge body and being damaged.

[0006]

However, as described above, in a disk cartridge which removes dust adhering to a magnetic disk by positively contacting the liner with the magnetic disk, The dust removed from the liner is entangled in the liner and adheres to the liner. If the magnetic disk rotates in this state, the magnetic disk may be damaged by dust attached to the liner.

In the above-described disk cartridge, a part of the liner is bulged by the ridges and the lifter and is always in contact with the magnetic disk, so that the load when rotating the magnetic disk is increased. In a disk recording / reproducing apparatus using such a disk cartridge, in order to ensure stable rotation of the magnetic disk, it is necessary to use a large drive motor constituting a disk rotation drive mechanism capable of generating a large drive torque.

In the above-described disk cartridge, when the upper and lower halves constituting the cartridge main body are deformed such as warpage, a state occurs in which the liner is brought into contact with the magnetic disk by the projection and the lifter with a large force, and There is a possibility that the load when rotating the motor is further increased. When the load on the magnetic disk increases, the drive torque also increases, and a large load is applied to the drive motor that constitutes the disk rotation drive mechanism, and it becomes impossible to perform stable rotation of the magnetic disk. By the way, the rotation speed of a magnetic disk whose recording capacity is to be increased is increased. For example, a magnetic disk having a diameter of 3.5 inches and a recording capacity of 200 megabytes or more is rotated at a rotation speed of 3000 rpm or more. As the rotation speed of the magnetic disk increases, the frictional force between the magnetic disk and the liner that contacts the magnetic disk also increases, and the frictional force may damage the signal recording surface of the magnetic disk. In order to rotate the magnetic disk at high speed, it is necessary to increase the rotation speed of the drive motor of the disk rotation drive mechanism. The drive torque of the drive motor decreases as the rotation speed increases,
If the load applied to the magnetic disk is slightly increased, stable rotation cannot be performed, and the magnetic disk cannot be rotated at a predetermined rotation speed. Then, there is a possibility that recording and reproduction of an information signal on the magnetic disk with good recording and reproduction characteristics may not be performed.

In view of the above, the present invention is intended to reliably protect a disk-shaped recording medium housed in a cartridge body and to realize stable rotation of a disk-shaped recording medium rotated at a high speed while being housed in the cartridge body. To provide a disk cartridge capable of cleaning a disk-shaped recording medium.

[0010]

In order to solve the above-mentioned problems, a disk cartridge according to the present invention has a disk-shaped recording medium provided with a clamp portion for clamping to a rotary drive mechanism at a central portion; A pair of upper and lower halves for rotatably storing a disk-shaped recording medium, and an opening for recording / reproducing that at least a part of a signal recording area of the disk-shaped recording medium faces outward at least on a lower surface side in a radial direction. A cartridge body, in which a central opening is provided in a central portion on the lower surface side to face a clamp portion provided on the disk-shaped recording medium outward, and opposing surfaces are formed flat, A non-breathable heat-sensitive adhesive layer is provided on one surface side, and the heat-sensitive adhesive layer is separated from the inner surface of the cartridge body by an adhesive portion bonded to the inner surface of the cartridge body. And a section, and a liner are respectively disposed on an inner surface which faces the cartridge body so as to sandwich the disc-shaped recording medium. The liner is disposed so as to bite into opposing inner surfaces of the cartridge body at the boundary between the bonded portion and the non-bonded portion. When the disk-shaped recording medium is rotated by the disk rotation mechanism of the recording and / or reproducing apparatus, the non-adhesive portion of the liner is released from the inner surface of the cartridge body and comes into contact with the rotating disk-shaped recording medium. At this time, since a biting portion in which the liner is cut into the inner surface of the cartridge body is formed at the boundary between the non-adhesive portion and the adhesive portion, the disc-shaped portion when the non-adhesive portion contacts the disc-shaped recording medium is formed. The resistance to the rotation of the recording medium can be increased, and the cleaning effect of the disk-shaped recording medium can be improved.

Specifically, the angle between the inner surface of the cartridge body and the biting surface of the liner is 90 ° to 15 °.
And the resistance can be increased by making it penetrate into the opposing inner surfaces of the cartridge body so that the bite depth is in the range of 0.05 to 0.5 mm.

Further, the liner has a stiffness value of 0.1.
By using the one in the range of 5 to 10 g, the resistance to rotation of the disk-shaped recording medium can be increased.

Further, the non-adhesive portion of the liner is formed in an area excluding a range of ± 30 ° on both sides of the recording / reproducing opening from a center line passing through the center of the cartridge body and dividing the recording / reproducing opening into two. As a result, the bending of the disk-shaped recording medium in the vicinity of the recording / reproducing opening can be eliminated, and the recording and / or reproducing means such as a magnetic head on the recording and / or reproducing apparatus side reliably records the information signal. Playback can be performed.

As described above, in order to cause the non-adhesive portion to bend when the disk-shaped recording medium rotates and to contact the disk-shaped recording medium, and to obtain a sufficient cleaning effect for the disk-shaped recording medium, the thickness of the liner should be set to 0.1 mm. 2 to 0.7 mm (5 g / c
It is preferably in the range of m at ² load).

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described with reference to an example in which the present invention is applied to a disk cartridge containing a magnetic disk as a disk-shaped recording medium.

The disk cartridge 1 according to the present invention comprises:
As shown in FIGS. 1, 2 and 3, a pair of upper and lower halves 2, which are formed in a substantially rectangular shape by injection molding of a synthetic resin or the like.
3 is provided with a cartridge body 4 in which butts 3 are joined together.
A magnetic disk 5 serving as a recording medium for information signals is housed in the cartridge body 4.

Here, the upper and lower halves 2 and 3 constituting the cartridge body 4 are formed by injection molding acrylonitrile butylstyrene (ABS) resin.

As shown in FIG. 3, the magnetic disk 5 housed in the cartridge body 4 has a diameter of approximately 3.5 inches in which magnetic layers are applied to both surfaces of a thin film made of a synthetic resin having flexibility. A disk main body 6. As shown in FIG. 4, a center hole 7 is formed in the center of the disk body 6, and a center core 8 is attached so as to fit into the center hole 7. The center core 8 is formed of a magnetic material such as a metal. When the magnetic disk 5 is mounted on a disk rotation driving mechanism provided on the disk recording / reproducing apparatus side, a magnetic attraction is provided by a magnet provided on the disk rotation driving mechanism. Then, the magnetic disk 5 is clamped by the disk rotation drive mechanism. That is, the center core 8 constitutes a clamp for the magnetic disk 5 to the disk rotation drive mechanism.

As shown in FIG. 4, the center core 8 has a flat tubular bulging portion 9 formed at the center thereof.
A flange portion 10 serving as a portion to be attached to the disk body 6 is integrally formed on the upper end side of the main body. Bottom 9a of bulge 9
Has a spindle shaft insertion hole 11 through which a spindle shaft constituting a disk rotation drive mechanism is inserted, and a drive pin insertion hole 1 into which a drive pin provided on the disk rotation drive mechanism engages.
2 are drilled. Standing walls 11 a and 12 are provided around the spindle shaft insertion hole 11 and the drive pin insertion hole 12.
a is formed. These rising walls 11a, 12
In a, the peripheral surfaces of the spindle shaft and the drive pin are supported by a wide surface, and the spindle shaft insertion hole 11 and the drive pin insertion hole 12 are securely engaged with the spindle shaft and the drive pin in a stable state.

At the bottom 9a of the bulging portion 9, there is formed a disk mounting portion 13 which is fitted to a disk table of a disk rotation driving mechanism. The disk mounting portion 13 is formed by providing a depression in the bottom portion 9a of the bulging portion 9, is mounted so as to fit on the disk table, and prevents the mounting position of the magnetic disk 5 with respect to the disk table from shifting.

Center core 8 constructed as described above
Is arranged such that the bulging portion 9 is fitted into the center hole 7 of the disk body 6 and the flange portion 10 is placed on one surface side of the disk body 6, and the flange portion 10 and the disk body 6 are bonded. It is attached to the disk body 6 by bonding with the agent 14.

The magnetic disk 5 used here has a capacity of 10
It has a storage capacity of 0 megabytes or more, is mounted on a disk rotation drive mechanism, and is rotated at a rotation speed of 3000 rpm or more.

As shown in FIGS. 1, 2 and 3, a cartridge main body 4 for accommodating the magnetic disk 5 constructed as described above has a pair of upper and lower parts formed by injection molding synthetic resin into a substantially rectangular shape. 5 and 6, the upper and lower halves 2 and 3 constituting the cartridge body 4 are abutted against each other as shown in FIGS. The front wall 15, the rear wall 16 of the main body 4 and the rising walls 19 and 20 which form the opposing side walls 17 and 18 are formed.

As shown in FIGS. 5 and 6, the upper half 2 and the lower half 3 face each other on the inner surfaces facing each other.
Partition formation walls 23 and 24 which form a partition wall 22 for partitioning a disk storage portion 21 for rotatably storing the disk storage portion 21 are formed upright. These partition walls 23, 2
As shown in FIGS. 5 and 6, the partition wall 22 is formed in an arc shape so as to inscribe the rectangular upper half 1 and the lower half 2, and is brought into contact with each other to form the partition wall 22 as shown in FIG. 7. The area enclosed by the partition wall 22 is defined as a disk storage unit 21. The partition wall 22 that forms the disk storage unit 21 has a rectangular upper half 1.
And the partition wall forming walls 23 and 24 formed in an arc shape so as to be inscribed in the lower half 2 are formed so as to abut each other, so that almost the entire outer circumference of the magnetic disk 5 stored in the disk storage portion 21 is covered. Surround.

As shown in FIGS. 2 and 3, the center core 8 mounted on the magnetic disk 5 housed in the cartridge body 4 has an expansion at the center of the lower half 3 constituting the lower surface side of the cartridge body 4. A circular central opening 25 that exposes the protrusion 9 outward is formed. Central opening 25
Is provided only on the lower half 3 side, and the central portion on the upper surface side of the cartridge main body 2 constituted by the upper half 2 is closed as shown in FIGS.

The upper half 2 and the lower half 3 which constitute the upper surface of the cartridge body 4 are located at opposite positions.
As shown in FIG. 1, FIG. 2 and FIG.
First and second recording / reproducing openings 26 and 27 are formed so that at least a part of the signal recording area of the magnetic disk accommodated in the first recording medium faces outward in the radial direction. The recording / reproducing openings 26 and 27 are located at the center in the left-right direction of the cartridge body 4 and have a substantially rectangular shape from a position near the center opening 25 to a position near the front wall 15 of the cartridge body 4. Is formed. As shown in FIGS. 5 and 6, the first and second recording / reproducing openings 26, 27 constitute recording / reproducing means for an information signal which enters the cartridge body 4 through these openings 26, 27. The magnetic head is formed to protrude from the disk storage part 21 toward the front wall 15 to a position close to the front wall 15 so that the magnetic head to be scanned can scan to the outer peripheral side of the magnetic disk 5 stored in the cartridge body 4. .

As shown in FIGS. 1 and 2, first and second recording / reproducing openings 26, 2 are formed in the cartridge body 4.
A shutter member 28 for opening and closing the shutter 7 is movably mounted. The shutter member 28 is formed by punching and bending a thin metal plate. As shown in FIG. 3, the shutter member 28 opens and closes a first recording / reproducing opening 26 formed on the upper surface of the cartridge body 4. 1 shutter unit 29
A second shutter unit 30 for opening and closing a second recording / reproducing opening 27 formed on the lower surface side of the cartridge body 4;
The base end sides of the first and second shutter portions 29 and 30 are set to the first position.
And a connecting plate 31 for connecting the shutter section 29 and the second shutter section 30 so as to be substantially parallel to each other. When the shutter member 28 is attached to the cartridge main body 4, the connecting plate 31 is formed to protrude on both sides of the first and second shutter portions 29 and 30 so as to extend toward the front wall 15 of the cartridge main body 4. The first and second cartridge holding portions 32 and 33 are provided on the protruding portions. As shown in FIGS. 1 and 2, the cartridge holding portions 32 and 33 are provided on the side of the connecting plate 31 where the first and second shutter portions 29 and 30 are connected. By forming a protruding piece projecting in the extension direction of the shutter portions 29 and 30, it is formed to have a U-shaped cross section so as to fit on the front wall 15 side of the cartridge body 4. The first and second cartridge holding portions 32,
The projecting portion protruding toward the second shutter portion 30 of the second shutter portion 30 includes a movement guide formed on both sides of the second recording / reproducing opening 27 along the front wall 15 on the lower surface side of the cartridge body 4. A pair of engagement pieces 36, which engage with the grooves 34, 35,
37 is formed by folding.

The shutter member 28 formed as described above
As shown in FIGS. 1 and 2, the first and second shutter portions 29 and 30 are disposed on the front wall 15 so as to extend over the first and second recording and reproducing openings 26 and 27, respectively. And the first and second cartridge holding portions 32 and 33 are fitted to the front wall 15 side of the cartridge body 4, and the pair of engagement pieces 36 and 37 are inserted into the movement guide grooves 34 and 35. It is attached to the cartridge body 4 by engaging. In the shutter member 28 thus attached to the cartridge body 4, the engagement pieces 36, 37 are guided by the movement guide grooves 34, 35, and the first and second shutter portions 29, 30 are moved by the first and second shutter portions. Recording / reproducing opening 2
1 and 2 are moved in the direction of arrow A and the direction of arrow B in FIG. 1 and FIG. 2 between the positions where the first and second recording / reproducing openings 26 and 27 are opened. You.

As shown in FIGS. 1 and 2, the upper and lower surfaces of the cartridge body 4 extend from the peripheral edges of the first and second recording / reproducing openings 26 and 27 to one side wall 16 of the cartridge body 4. A shutter-moving recess 38,
39 are formed. A moving recess 40 corresponding to the thickness of the connecting plate 31 is also formed on the front wall 15 side of the cartridge body 4 over the moving range of the shutter member 28. The shutter member 28 is configured to extend the first and second shutter portions 29 and 30 into the shutter moving recesses 38 and 39, and to position the connecting plate 31 within the moving recess 40 so that the peripheral surface of the cartridge body 4 is formed. They are attached almost flush with each other without protruding from them.

The shutter member 28 attached to the cartridge body 4 closes the first and second recording / reproducing openings 26 and 27 by a torsion coil spring 43 which is an urging member disposed in the cartridge body 4. 1 and 2 in the direction of arrow B in FIG. As shown in FIG. 3, the torsion coil spring 43 is disposed at one corner of the cartridge body 4 located when the shutter member 28 opens the first and second recording / reproducing openings 26, 27. I have. The torsion coil spring 43 is disposed in the cartridge body 4 with one end locked to the cartridge body 4 and the other end locked to a spring locking section provided on the first cartridge holding section 32. The shutter member 2
8 is urged in the direction of arrow B in FIGS. 1 and 2 to close the first and second recording / reproducing openings 26 and 27.

The upper half 2 constituting the cartridge body 4
As shown in FIG. 7, a disk movement restricting rib 45 for restricting the movement of the magnetic disk 5 is protrudingly provided at a central portion on the inner surface side. The disk movement restricting rib 45 is formed in a circular shape having an outer diameter capable of entering the bulging portion 9 of the center core 8 provided on the magnetic disk 5, and as shown in FIG. The movement of the magnetic disk 5 in the plane direction is restricted by the magnetic disk 5.
Thus, the magnetic disk 5 is prevented from being deformed by contact with the magnetic disk 1 and is protected.

When the magnetic disk 5 is moved toward the upper half 2, the disk movement restricting rib 45 contacts the bottom 9 a of the bulging portion 9 of the center core 8, and
To prevent the flange portion 10 of the center core 8 located on the upper surface side from contacting the inner surface of the upper half 2, and the metal center core 8 cuts the synthetic resin upper half 2 to generate shavings. Has been prevented.

As shown in FIG. 7, when the magnetic disk 5 is supported by the disk movement restricting rib 45, the center core 8
An annular concave portion 46 into which the flange portion 10 enters is formed. By forming the annular concave portion 46 in this manner,
Flange 1 while reducing the thickness of cartridge body 4
The contact of the upper half 2 with the inner surface of the upper half 2 can be prevented. Further, as shown in FIG. 7, an inclined surface 25a is formed on the inner peripheral side of the central opening 25 formed in the lower half 3. The inclined surface 25a is for releasing the flange portion 10 of the center core 8, which becomes thick.

Further, on the inner surface side of the upper half 2, as shown in FIG. 7, ring-shaped ribs 48 forming a liner mounting portion 47 together with the partition wall 22 so as to surround the annular concave portion 46.
Are protruding. A region surrounded by the partition wall 22 and the rib 48 is a liner mounting portion 47 formed on a flat surface.
Is made. As shown in FIG. 5, a magnetic disk 5 housed in the cartridge body 4 is
A liner 49 is provided to clean the magnetic disk 5 and to protect the magnetic disk 5. The liner 49 divides a ring-shaped sheet material having a size to cover the main surface of the disk main body 6 constituting the magnetic disk 5 into two equal parts, and forms a first sheet part 49a and a second sheet part 49b. Consists of
The first sheet portion 49a and the second sheet portion 49b are formed in a substantially C shape, and as shown in FIG.
7, a notch 49c is formed at a portion corresponding to the first recording / reproducing opening 26 so as to open the first recording / reproducing opening 26.

The area surrounded by the partition wall 24 of the lower half 3 is also formed on a flat surface.
As shown in FIG. 6, a liner 51 for cleaning the magnetic disk 5 housed in the cartridge body 4 and protecting the magnetic disk 5 is provided.
The liner 51 also divides a ring-shaped sheet material having a size to cover the main surface of the disk main body 6 constituting the magnetic disk 5 into two equal parts, thereby forming a first sheet part 51a and a second sheet part 51b. Consists of The first sheet portion 51a and the second
The sheet portion 51b is formed in a substantially C shape, and as shown in FIG. 6, when the sheet portion 51b is disposed in the liner disposing portion 50, the portion corresponding to the second recording / reproducing opening portion 27 has The notch 51c is formed so as to open the recording / reproducing opening 27 of No.2.

As shown in FIG. 8, the liners 49 and 51 used on one side of a gas-permeable liner main body 52 made of a nonwoven fabric mainly composed of cellulose fiber such as rayon (trade name) are used. The heat-sensitive adhesive layer 53 is provided so as to be laminated. The heat-sensitive adhesive layer 53
It is used to block the ventilation of the liner body 52 having air permeability and to join the liners 49 and 51 to the inner surfaces of the upper and lower halves 2 and 3, and has a heat-sensitive adhesive property such as ethylene vinyl acetate or polyethylene terephthalate ( It is formed by applying a polymer material such as PET (PET) to one surface of the liner body 52. The heat-sensitive adhesive layer 53 is formed by bonding a film made of polyethylene terephthalate (PET) having heat-sensitive adhesive property to one surface of the liner main body 52.

The liners 49 and 51 have a Young's modulus of 2.0 to 15.0 kgf / mm ² and a thickness (thickne).
ss) of 0.2 to 0.7 mm (when measuring a load of 5 g / cm ² ) and a stiffness value of 0.5 to 10 g are used. That is, when the magnetic disk 5 is rotated at a high speed, the liners 49 and 51 float by the air pressure between the inner surface of the cartridge main body 4 and the liners 49 and 51 and come into contact with the magnetic disk 5 to sufficiently enhance the cleaning effect. What is obtained is used. Further, for example, the liner body 52 has a thickness of 0.25 to 0.35 mm,
3 having a thickness of 10 to 30 μm is used. Then, the liner body 52 has a thickness of 0.25 to 0.35 mm (no load) and a thickness of the heat-sensitive adhesive layer 53 of 10 to 30 μm (no load) so that the liners 49 and 51 have the above characteristics. Is used.

When the liners 49 and 51 are joined to the upper and lower halves 2 and 3, the polymer material having heat-sensitive adhesive property constituting the heat-sensitive adhesive layer 53 comes into contact with the magnetic disk 5 to protect the magnetic disk 5. In order to prevent the liner main body 52 from being damaged by heat, it is desirable to use a material that is cured at a temperature lower than the melting point of the material forming the liner main body 52 and adheres to the upper and lower halves 2 and 3.

As shown in FIGS. 5 and 6, the liners 49 and 51 are heat-welded using ultrasonic waves to the opposing inner surfaces of the upper half 2 and the lower half 3, using the heat-sensitive adhesive layer 53 as an adhesive surface. Joined by the device.

Here, the first and second sheet portions 49a and 51a and the second sheet portions 49b and 51b pass through the center O of the cartridge body 4 as shown in FIGS. The heat-sensitive adhesive layer 53 is positioned relative to the upper half 2 and the lower half 3 within a range of an angle α from both sides of the first and second recording / reproducing openings 26 and 27 from the center line at which the openings 26 and 27 are divided into two. Adhesive parts 54 and 55 bonded to opposing inner surfaces
Are formed, and the non-adhesive portions 56 and 57 are formed in other regions.

Here, the angles θ of the bonding portions 54 and 55 are ±
30 ° or more, that it is formed in a range of 30 ° or more on the upstream side and the downstream side from the center line L ₀ in the rotation direction of the magnetic disk 5. The bonding portions 54 and 55 are formed such that the angle α is in a range of ± 30 ° or more, so that the first sheet portions 49a and 5
1a and the second sheet portions 49b, 51b
The contact is made in the vicinity of the position where the magnetic disk 8 slides, thereby preventing the flexible magnetic disk 5 from being deformed. And
The bonding portion 54 on the upper half 2 and the bonding portion 55 on the lower half 3
Are provided at positions facing each other when the upper and lower halves 2 and 3 are butt-joined. Further, each corner of the first and second sheet portions 49a, 49b, 51a, 51b is cut out in an arc shape to prevent the magnetic disk 5 from being damaged when coming into contact with the rotating magnetic disk 5. I have.

The non-adhesive portions 56 and 57 are
4 and 55 are areas where the magnetic disks 5 are separated from the inner surfaces of the upper and lower halves 2 and 3 so as to be bent and deformed to come into contact with the main surface of the magnetic disk 5 which is rotated and driven in the cartridge body 4. This is a part to be cleaned.
The non-adhesive portions 56 and 57 have a length that can be in contact with the main surface of the magnetically driven magnetic disk 5 that is separated from the inner surfaces of the upper and lower halves 2 and 3 and deforms at least when the magnetic disk 5 is rotationally driven. Is provided. That is,
The non-adhesive portions 56 and 57 are formed in an area of ± 30 ° or more on both sides of the first and second recording / reproducing openings 26 and 27 from the center line L ₀ , so that the non-adhesive portions 56 and 57 are formed. The magnetic disk 5 is prevented from being bent and deformed at positions corresponding to the first and second recording / reproducing openings 26, 27.

[0043] In the example shown in FIGS. 5 and 6, the end on the upstream side with respect to the first sheet portion 49a, FIG. 5 and in FIG. 6 the arrow R ₁ direction is the rotational direction of the magnetic disk 5 of 51b Non-adhesive portions 56 and 57 are formed on the side of the
55 are formed so that the angle α is about 120 ° on both sides of the first and second recording / reproducing openings 26 and 27 from the center line L ₀ , and non-adhesive portions 56 and 57 are formed in the remaining area. ing.

[0044] Here, the adhesive 54 and 55 passes through the center O of the cartridge main body 4, the center line L ₀ of the first and second recording reproducing apertures 26, 27 divided into two each of the first
30 ° on both sides of the second recording / reproducing openings 26, 27.
When the magnetic disk 5 was formed in the above range, the amount of bending deformation of the magnetic disk 5 with respect to the magnetic head 88 was confirmed. Here, as shown in FIG. 11, the bending angle θ of the magnetic disk 5 was measured at a position where the magnetic head 88 was in sliding contact with the magnetic disk 5. As shown in FIG. 12, the deflection angle θ irradiates laser light to three points from the vicinity of the magnetic head 88 to the upstream side with respect to the rotation direction of the magnetic disk 5 at minute intervals,
The amount of displacement of the magnetic disk 5 was measured by measuring the distance between the light emitting source and the magnetic disk 5, and the amount of displacement was calculated by converting the amount of deflection into the deflection angle θ.

The sample A follows the same method as the conventional disk cartridge. A lifter is provided near the first and second recording / reproducing openings 26 and 27, and the liner is connected to the first and second recording / reproducing openings. The second recording / reproducing openings 26 and 27 are brought into contact with the magnetic disk 5 on the upstream side in the rotation direction of the magnetic disk 5.

Sample B is an example to which the present invention is applied, in which the adhesive portions 54 and 55 are formed in a range of 30 ° from both sides of the center line L ₀ to the first and second recording and reproducing openings 26 and 27. It was done.

[0047] Sample C is an example of applying the present invention, formed in the range of 45 ° to both sides of the adhesive portion 54, 55 from the center line L ₀ first and second recording reproducing apertures 26, 27 It was done.

Sample D is an example to which the present invention is applied, in which the bonding portions 54 and 55 are formed at 90 ° from both sides of the center line L ₀ to the first and second recording and reproducing openings 26 and 27. It was done.

Sample E is an example to which the present invention is applied, in which the adhesive portions 54 and 55 are formed at 180 ° from both sides of the center line L ₀ to the first and second recording and reproducing openings 26 and 27. It was done.

Table 1 shows the results.

[0051]

[Table 1]

As is clear from Table 1, the bonding portions 54, 5
5 from the center line L ₀ to the first and second recording / reproducing openings 2
When formed on both sides of the magnetic disks 6 and 27 within a range of 30 °, the bending angle θ can be set to 1.0 to 1.2 °, and the amount of bending deformation of the magnetic disk 5 is extremely small. And
As samples B to E become first and second,
Center line L _{0 that} divides the recording / reproducing openings 26 and 27 of FIG.
The range in which the bonded portions 54 and 55 are formed from
Accordingly, the deflection angle θ decreases, and the magnetic disk 5
It has been confirmed that the amount of flexural deformation becomes small. From this result, the range in which the bonding portions 54 and 55 are formed is determined by the center line L _0.
Preferably in the range of 30 ° or more from further preferably in a range from the center line L ₀ of 45 ° or more, further, it can be confirmed that preferably in the range of more than 90 °.

Using the samples A and D described above, the time until a recording / reproducing error occurred was confirmed.

[0054]

[Table 2]

As shown in Table 2, in sample A, 89
It was confirmed that the recording / reproducing error occurred with time, but the sample D did not generate the recording / reproducing error even after elapse of 336 hours. Such an adhesive 54, 55 from the center line L ₀ in the first and second recording reproducing apertures 26,
When formed on both sides of 27 at an angle of 30 ° or more, the time until a recording / reproducing error occurs can be greatly lengthened, and the cleaning effect by the non-adhesive portions 56 and 57 can be greatly improved as compared with the conventional case. It can be confirmed that it is excellent.

As shown in FIGS. 14A and 14B, the liners 49 and 51 are provided on the inner surface of the cartridge body 4 at the boundaries between the bonded portions 54 and 55 and the non-bonded portions 56 and 57. Bites 60 and 61 are formed. As shown in FIG. 14B, the bite portions 60 and 61 have an angle γ between the inner surface of the cartridge body 4 and the bite surfaces of the liners 49 and 51 in the range of 90 ° to 15 °.
It is formed so that the biting depth h is in the range of 0.05 to 0.5 mm. Inner surface of cartridge body 4 and liner 4
If the angle γ between the biting surfaces 9 and 51 is larger than 90 ° and the biting depth is larger than 0.5 mm, the resistance to rotation of the magnetic disk 5 becomes too large and the inner surface of the cartridge body 4 When the angle γ formed between the magnetic disk 5 and the biting surfaces of the liners 49 and 51 is smaller than 15 ° and the biting depth is smaller than 0.05, a sufficient resistance to the rotation of the magnetic disk 5 can be obtained. This is because a sufficient cleaning effect on the magnetic disk 5 cannot be obtained.

Here, the resistance to the rotating magnetic disk 5 when the liners 49 and 51 were cut into the inner surface of the cartridge body 4 to form the biting portions 60 and 61 was confirmed. Table 3 shows the results.

[0058]

[Table 3]

As shown in Table 3, when the cut-in portions 60, 61 were not formed between the bonded portions 54, 55 and the non-bonded portions 56, 57, the non-bonded portions to the rotating magnetic disk 5 were not formed. The resistance of 56, 57 was 2.5 g · cm. On the other hand, when the digging depth h is 0.1 mm and the digging angle γ is 30 °, the resistance becomes 3.3 g · cm, and when the digging angle γ is 45 °, the resistance becomes 4 When the biting angle γ is 60 °, the resistance becomes 5.3 g · cm.

When the bite depth h is 0.3 mm and the bite angle γ is 30 °, the resistance becomes 3.5 g · cm. When the bite angle γ is 45 °, the resistance becomes 4 g. When the biting angle γ is 60 °, the resistance becomes 5.8 g · cm.

Further, when the bite depth h is 0.5 mm, if the bite angle γ is 30 °, the resistance becomes 4.1 g · cm, and if the bite angle γ is 45 °, the resistance becomes 5 g. When the biting angle γ is 60 °, the resistance becomes 6.2 g · cm.

As described above, when the bite depth h of the bite portions 60 and 61 is increased and the bite angle γ is increased, the resistance (g) of the non-adhesion portions 56 and 57 to the rotating magnetic disk 5 is increased. .Cm) increases, and it can be confirmed that the cleaning effect of the magnetic disk 5 is improved.

As described above, the rigidity of the liners 49 and 51, that is, the stiffness, is set to a value of 0.1 from the relation of the resistance (g · cm) of the non-adhesion portions 56 and 57 to the rotating magnetic disk 5. It is in the range of 5-10 g. That is, when the stiffness value is smaller than 0.5 g, a sufficient resistance to the rotation of the magnetic disk cannot be obtained, and the cleaning effect of the magnetic disk 5 cannot be sufficiently obtained. If the value is larger than 10 g, the resistance to the rotation of the magnetic disk 5 becomes too large.

In this regard, the relationship between the rigidity, ie, the stiffness, and the resistance (g · cm) of the non-adhesion portions 56 and 57 to the rotating magnetic disk 5 was confirmed. Table 4 shows the results.

[0065]

[Table 4]

As shown in Table 4, when the stiffness of the liners 49 and 51 is 0.3 g, the resistance is 2.5 g.
· Cm, and when the rigidity of the liners 49, 51 is 0.5 g, the resistance becomes 3.0 g · cm.
When the rigidity of the liners 49 and 51 is 1.5 g, the resistance is 3.8 g · cm. When the rigidity of the liners 49 and 51 is 3.0 g, the resistance is 4.5 g · cm and the rigidity of the liners 49 and 51 is 5 g. When the weight was 0.0 g, the resistance was 5.6 g · cm.

As described above, as the rigidity of the liners 49 and 51 increases, the resistance to the rotating magnetic disk 5 increases, and it can be confirmed that the cleaning effect of the magnetic disk 5 is improved.

As shown in FIGS. 9 and 10, a rough surface is formed on the inner surfaces of the upper and lower halves 2 and 3 where the liners 49 and 51 are respectively provided, where the non-adhesive portions 56 and 57 face each other. You may do it. By forming the rough surface, the non-adhered portions 56 and 57 are applied with the load of the magnetic disk 5 and the like on the liners 49 and 51 and adhere to the inner surfaces of the upper and lower halves 2 and 3 from the inner surfaces of the upper and lower halves 2 and 3. Is prevented from being inhibited.

For the rough surfaces 58 and 59, the liner body 52
Is made of a nonwoven fabric mainly composed of cellulose fiber such as rayon (trade name), and a liner 4 using a heat-sensitive adhesive layer 53 made of ethylene vinyl acetate.
9 and 51 are placed on a test plate having a different surface roughness (Rz), and are about twice as large as the center core 8 mounted on the 3.5-inch magnetic disk 5 on the liners 49 and 51. A weight of about 3 g is placed on the plate and stored for one week in a high-temperature and high-humidity environment at a temperature of 60 ° C. and a humidity of 90%, and then returned to a normal temperature. The state of sticking was visually confirmed.

At this time, the liners 49 and 51 are placed with the heat-sensitive adhesive layer 53 side facing the surface of the plate. The plate material was formed of the same ABS resin as the material forming the upper and lower halves 2 and 3.

As a result, when the liners 49 and 51 were placed on the plate material having a mirror-finished surface, traces of sticking were observed, and the liner 4 was placed on the plate material having a surface roughness of 3 to 4 μmRz.
When 9 and 51 were placed, traces of sticking were slightly observed.

The surface roughness is 8 to 10 μm Rz, 12 to 1
Liner 4 on 5 μmRz and 17-19 μmRz plate
When 9, 51 was placed, no trace of sticking was observed at all.

When a plate having a surface roughness of more than 20 μmRz is formed by molding an ABS resin, molding defects such as large projections and the like due to uneven release from a molding die occur.

From the above results, the non-adhesion portions 56 and 5
7 adheres to the inner surfaces of the upper and lower halves 2 and 3
The rough surfaces 58 and 59 provided to prevent the release from the inner surface of the steel have an average roughness of 5 to 20 μmR.
It is formed in the range of z.

Here, a method of joining the liner 51 to the liner disposition portion 50 will be described by taking a heat welding apparatus for joining the liner 51 to the liner disposition portion 50 as an example. In order to attach the liner 51 to the lower half 3, FIG.
As shown in (B), the lower half 3 is placed on the welding table 111 of the heat welding apparatus with the inner surface facing upward, and a ring-shaped liner 51 is formed on the inner surface of the lower half 3 so as to surround the central opening 25. Is positioned and placed. Here, the heat welding horn 112 of the heat welding device is pressed onto the liner 51, ultrasonic waves are applied to melt the heat-sensitive adhesive layer 53 provided on the liner 51, and the liner 51 is bonded to the inner surface of the lower half 3. The lower half 3 is attached to the inner surface of the lower half 51.

The welding horn 112 used here is formed in a size substantially corresponding to the outer shape of the liner 51, and a cutout step 113 is formed in a portion corresponding to the non-adhered portion 57 of the liner 51, When the bonding surface 114 to which the sound wave is applied comes into contact with the bonding portion 55, it is formed so as not to contact a portion corresponding to the non-bonding portion 57. At the center of the heat welding horn 112, a recess 115 which escapes the center opening 25 is formed.

Further, on the tip side of the heat welding horn 112,
Notch step 113 corresponding to non-bonding portion 57 and bonding portion 5
At the boundary with the contact portion 114 corresponding to 5, a projection 116 for forming the biting portion 61 by making the liner 51 bite into the lower half 3 is formed.

The heat welding horn 11 formed as described above
13B is pressed onto the liner 51 disposed on the inner surface of the lower half 3 as shown in FIG. 13B, and when the ultrasonic wave is applied, the heat-sensitive adhesive layer 53 corresponding to the portion where the contact surface 114 is in contact melts. And is adhered to the inner surface of the lower half 3 to form an adhesive portion 5
5 is formed, and the heat-sensitive adhesive layer 53 corresponding to the notch step 113 is left as a non-adhesion portion 57 where no ultrasonic wave is applied and the inner surface of the lower half 3 is not adhered.
At this time, the protrusion 116 provided on the heat welding horn 112
Is pressed against the liner 51 more strongly than other parts, so that the liner 51 bites into the inner surface of the lower half 3,
A biting portion 61 is formed. Welding horn 1 as described above
In 12, the biting portion 61 can be formed simultaneously with the formation of the bonding portion 55.

In the disk cartridge 1 shown here, as shown in FIGS. 1 and 2, the air in the disk storage portion 21 which is a space surrounded by the partition wall 22 is exhausted to the outside of the cartridge body 4. Outlet 65 and an exhaust passage 66 communicating with the outlet 65 are formed. As shown in FIG. 15, the exhaust port 65 is formed by cutting out a part of the front wall 15 of the cartridge main body 4, and the shutter member 28 is provided with the first and second recording / reproducing openings 2.
When the shutter member 28 is at the position where it closes, the shutter member 28 is covered by a part of the shutter member 28, and the shutter member 28 opens the first and second recording and reproducing openings 26 and 27 as shown in FIG. It is provided at a position that is opened when it is moved to.

That is, the exhaust port 65 is connected to the shutter member 2
As shown in FIGS. 1 and 2, when the shutter 8 is in a position to close the first and second recording / reproducing openings 26 and 27, it protrudes to the side of the first and second shutters 29 and 30. The second
And the shutter cover 28 at a position covered by the cartridge holding portion 33 and the side where the torsion coil spring 43 for urging the shutter member 28 in the direction to close the first and second recording / reproducing openings 26 and 27 is disposed. It is provided on the side facing the member 28.

As shown in FIG. 5 and FIG. 6, the exhaust port 65 is opposed to a part of the rising walls 19 and 20 of the upper and lower halves 2 and 3 constituting the front wall 15 of the cartridge body 4 so as to face each other. 65a and 65b are formed, and the rising walls 19 and 20 are formed by butting.

As shown in FIGS. 1 and 2, the exhaust port 65 is provided with the first and second recording / reproducing openings 2 as shown in FIGS.
When the disc cartridge 1 is not mounted on the disc recording and / or reproducing apparatus, such as when the disc cartridge 1 is stored, since the disc cartridge 1 is provided at a position covered by a part of the shutter member 28 when the disc cartridge 6 is at the closed position. Dust and the like are prevented from entering the cartridge body 4 through the exhaust port 65.

Also, the space between the disk storage section 21 and the exhaust port 65 is communicated, and the air in the disk storage section 21 is released from the exhaust port 65.
As shown in FIGS. 5 and 6, cut-out portions 23a and 24a are formed in part of partition wall forming walls 23 and 24 that form the partition wall 22 that partitions the disk storage portion 21, as shown in FIGS.
Are formed. These notches 2
3a and 24a are formed in a portion of the partition wall 22 facing the exhaust port 65.

As shown in FIGS. 5 and 6, on one side of an exhaust passage 66 extending from the partition wall 22 to the exhaust port 65, an air guide section 67 for guiding air flowing from the disk storage section 21 to the exhaust port 65 is provided. Is provided.

The magnetic disk 5 housed in the cartridge body 4 is clamped by the rotary drive mechanism and
And when driven to rotate 6 in the direction of arrow R _1, in the same direction as the rotational direction of the magnetic disk 5 toward the outer peripheral side from the central opening 25 side in the disc housing section 21 with the rotation of the magnetic disk 5 A flowing spiral air flow is generated.

Therefore, the air guide portion 67 is provided on one side of the exhaust passage 66 facing the air flow so as to surely guide the air in the disk storage portion 21 to the exhaust port 65. By providing the air guide portion 67 at a position facing the air flow in this manner, the air flow spirally flowing from the center of the disk storage portion 21 toward the outer periphery collides with the air guide portion 67, and this air flow The air is exhausted to the outside of the cartridge body 4 through the exhaust port 65 by being guided by the guide portion 67 toward the exhaust port 65.

Since the air in the disk storage unit 21 is exhausted from the cartridge main body 4 as the magnetic disk 5 rotates, dust that has entered the disk storage unit 21 is removed together with the air exhausted from the cartridge main unit 4. Can be discharged from

As shown in FIG. 2, positioning pins for positioning the mounting position of the disk cartridge 1 provided on the disk recording / reproducing apparatus side are provided on the lower surface side of the cartridge body 4 constituting the disk cartridge 1 according to the present invention. First and second positioning reference holes 69, 70 with which 81, 82 are engaged are provided. These positioning reference holes 69 and 70 are located on the front wall 15 side, and
8, the first positioning reference hole 69 is formed in a circular shape corresponding to a positioning pin having a circular cross section, and the second positioning reference hole 70 is formed.
Is formed as an elongated hole having a long diameter in the moving direction of the shutter member 28 so that the engagement position with the positioning pin can be corrected.

As shown in FIG. 2, an erroneous recording prevention member 71 is movably provided at one corner on the lower surface side of the cartridge body 4 and on the back wall 16 side. The erroneous recording preventing member 71 opens and closes an erroneous recording preventing hole 72 formed in the cartridge body 4 to enable recording of an information signal on the magnetic disk 5 and to prevent recording of the information signal. Select

Further, on the lower surface side of the cartridge body 4 and near the other corner portion and the first positioning reference hole 69 on the rear wall 16 side, as shown in FIG. First and second recording capacity identification holes 73 and 74 indicating the recording capacity of the magnetic disk 5 are provided.

Further, the front wall 1 of the cartridge body 4
At the other corner on the upper surface side of the disk 5, mounting to a disk recording / reproducing apparatus using a disk cartridge containing a magnetic disk having a recording capacity different from that of the magnetic disk 5 of the disk cartridge 1 according to the present invention is prohibited. Mounting restricting portion 75 is provided. The mounting restricting portion 75 is formed as a concave portion having the front wall 15 side of the cartridge body 4 opened.

The inner corners of the upper and lower halves 2 and 3 constituting the cartridge body 4 are provided at the corners in FIGS.
As shown in FIG. 3, welding projections 76 and 77 are provided which are abutted and engaged with each other.
Abuts the welding projections 76 and 77 and abuts the rising walls 19 and 20, between the butted welding projections 76 and 77 and the rising walls 19 and 20.
The cartridge body 4 is formed by welding the gaps using ultrasonic waves or the like.

When the disk cartridge 1 constructed as described above is mounted on a disk recording / reproducing apparatus using the disk cartridge 1 as a recording medium, the first and second positioning reference holes are provided as shown in FIG. 69, 70 are positioning pins 8 provided on the disk recording / reproducing apparatus side.
1 and 82 for positioning in the horizontal direction, and a cartridge 4
The mounting height position is determined by supporting the corner portion on the rear wall 16 side.

When the disc cartridge 1 is mounted on the disc recording / reproducing apparatus, as shown in FIG. 16, the center core 8 facing the central opening 25 provided on the lower surface side of the cartridge body 4 is moved to the disc recording / reproducing apparatus. Is mounted on a disk table 84 constituting a disk rotation driving mechanism 83 provided on the side of
1, a spindle shaft 85 of the disk rotation drive mechanism 83 is inserted, and a drive pin 86 is further inserted into the drive pin insertion hole 12. At this time, the center core 8 is
a to the disk table 84
The magnet 8 is mounted on the disc table 84 so as to be fitted to the
The magnetic disk 5 is sucked by the disk drive 7 and becomes rotatable integrally with the disk table 84. At this time, since the magnetic disk 5 is mounted on the disk table 84 via the concave disk mounting portion 13 provided in the center core 8, the displacement of the mounting position with respect to the disk table 84 is prevented, and the magnetic disk 5 can be easily rotated. The shaft insertion hole 11 can be inserted through the spindle shaft 85, and the drive pin 8
It is also possible to regulate the displacement of the mounting position with respect to the disk table 84 so that the disk drive 6 can be inserted into the drive pin insertion hole 12. When a spindle motor (not shown) constituting the disk rotation driving mechanism 83 is driven in a state where the magnetic disk 5 is rotatable integrally with the disk table 84, the magnetic disk 5 It is driven to rotate in synchronization with the rotation of the table 84.

When the disk cartridge 1 is mounted on the disk recording / reproducing apparatus, the shutter member 28 is opposed to the urging force of the torsion coil spring 43 by the shutter opening operation mechanism provided on the disk recording / reproducing apparatus side as shown in FIGS. The first and second recording / reproducing openings 26 and 27 are opened by being moved in the direction of arrow A in FIG. At this time, the exhaust port 65 provided in the front wall 15 of the cartridge body 4 is also
It is opened as shown in FIG.

By the way, the disk cartridge 1 is mounted on the disk recording / reproducing apparatus so as to be positioned in the horizontal direction and the height direction, the spindle shaft 85 is inserted into the spindle shaft insertion hole 11 and the drive pin is inserted into the drive pin insertion hole 12. 86 are engaged, and the magnetic disk 5 is
When the magnetic disk 5 is mounted on the disk table 84 so as to be rotatable in synchronization with the magnetic disk 5, the magnetic disk 5 is lifted up from the lower half 3 of the cartridge body 4,
The cartridge body 4 is located at a substantially middle position in the thickness direction.

Here, the magnetic disk 5 positioned and mounted on the disk rotation drive mechanism 83 has at least three magnetic disks.
When the magnetic disk 5 is rotated at a rotation speed of 000 rpm or more, for example, at a rotation speed of 3000 rpm to 3600 rpm, an air flow that flows in a spiral shape in the rotation direction of the magnetic disk 5 is generated in the disk housing 21. This air flow becomes a spiral flow from the center of the cartridge body 4 to the outer peripheral side, and flows through the central opening 25 provided on the lower surface side of the cartridge body 4.
Acts to suck air into the interior. When the air is sucked from the central opening 25, a spiral air flow is generated in which a region between the lower half 3 constituting the lower surface of the cartridge body 4 and the magnetic disk 5 is in a pressurized state.

When the magnetic disk 5 is driven to rotate, the air sucked from the central opening 25 provided in the cartridge body 4 is disposed on the inner surface of the lower half 3 and the lower half 3 as shown in FIG. Flows into the non-bonded portion 57 of the liner 51. At this time, the non-air-permeable heat-sensitive adhesive layer 53 is provided on the surface of the non-adhesive portion 57 facing the inner surface of the lower half 3.
Is provided, the inner surface of the lower half 3 and the liner 51 are provided.
Air flowing between the liner 51 and the non-adhesive portion 57 is ventilated through the liner 51 and is restricted from flowing between the liner 51 and the magnetic disk 5.
Between the non-adhesive portion 57, shown in Figure 18, to generate an air flow R ₂ spiral, the liner pressure P ₀ between the non-adhesive portion 57 of the inner surface and the liner 51 of the lower half 3 51
And larger than the pressure P ₁ between the magnetic disk 5. Due to this pressure difference, the non-adhesion portion 57 of the liner 51 is flexed and deformed and comes into contact with the other main surface of the magnetic disk 5.

The liner 51 disposed on the lower half 3 side
Is lifted, the pressure P ₁ between the liner 51 on the lower half 3 side and the magnetic disk 5 is also increased, and is rotated by receiving a force to float on the upper half 2 side. You. On the other hand, the non-adhesive portion 56 of the liner 49 disposed on the upper half 2 side is bent toward the magnetic disk 5 by its own weight as shown in FIG. Then, the magnetic disk 5 comes into contact with the rotating magnetic disk 5.

As described above, in the disk cartridge 1 according to the present invention, when the magnetic disk 5 is driven to rotate, a part of the liners 49 and 51 comes into contact with both main surfaces of the magnetic disk 5, so that the magnetic disk 5 is cleaned. It can be performed. At this time, since the liners 49 and 51 are not brought into contact with the magnetic disk 5 by using a pressurizing means such as a lifter as in the conventional disk cartridge, it is necessary to apply a pressure that hinders the rotation of the magnetic disk 5. No,
Further, the magnetic disk 5 is not damaged such as abrasion.

A magnetic head 88 for recording or reproducing information signals on or from the magnetic disk 5 enters the cartridge body 4 through the first and second recording / reproducing openings 26 and 27, and enters the magnetic disk 5. Make sliding contact. At this time, FIG.
As shown in FIG. 1, the first and second recording / reproducing openings 26,
In the vicinity of 27, the liners 49, 51
And does not come into contact with the rotating magnetic disk 5 because it is adhered to the inner surface of the cartridge body 4. Therefore, since the magnetic disk 5 does not bend and deform in the vicinity of the first and second recording / reproducing openings 26 and 27, the magnetic head 88 reliably records or reproduces data on / from the magnetic disk 5. It can be performed. Further, since the liners 49 and 51 are bitten into the inner surface of the cartridge body 4 by the biting portions 60 and 61, the resistance to the rotation of the magnetic disk 5 is increased, so that the rotating magnetic disk 5 can be reliably cleaned. Can be.

The air sucked into the cartridge body 4 is exhausted from the exhaust port 65 as an air flow by rotating the magnetic disk 5. At this time, dust and the like generated from the magnetic disk 5 to be cleaned by the liners 49 and 51 are also discharged from the exhaust port 65 together with the air flow and are prevented from remaining in the cartridge body 4, so that the magnetic disk 5 and the magnetic head Can be reliably prevented. In the disk cartridge 1 described above, the exhaust port 65 for exhausting the air in the cartridge body 4 is provided, but the exhaust port 65 is not necessarily provided.

In the case of a disk-shaped recording medium in which the center core 8 is not attached to the center hole 7 of the disk body 6 like the magnetic disk 5 described above, the center hole formed in the center of the disk body and The periphery of the center hole is used as a clamp for the disk rotation drive mechanism.

Further, the above-described disk cartridge 1
Has described the case where the bonding portions 54 and 55 and the non-bonding portions 56 and 57 are provided to face each other.
As long as the rotating magnetic disk 5 can be sandwiched between 6, 57, it is not always necessary to provide the magnetic disk 5 at an opposing position.

Although the above-described disk cartridge 1 has been described with an example in which the magnetic disk 5 is housed, the present invention uses not only a disk cartridge housing a flexible disk but also a rigid disk substrate. The present invention can be widely applied to a disk cartridge containing a disk-shaped recording medium such as an optical disk or a magneto-optical disk, and the same operation and effect as those of the above-described disk cartridge can be obtained.

[0106]

The disk cartridge according to the present invention has the following features.
When the non-adhesive portion of the liner disposed in the cartridge body is bent and brought into contact with the disk-shaped recording medium that is rotated and driven in the cartridge body, a cut-in portion is formed at the boundary between the adhesive portion and the non-adhesive portion. By doing so, the resistance to rotation of the disk-shaped recording medium can be increased, so that the disk-shaped recording medium can be reliably cleaned. In addition, since this resistance does not cause a large load on the disk-shaped recording medium to be rotationally driven, stable rotation of the disk-shaped recording medium is guaranteed, and the recording and reproducing for recording and reproducing the information signal is performed. /
Alternatively, the relative relationship between the reproducing means and the disc-shaped recording medium can be kept constant, and the recording and reproducing of the information signal can be performed with good recording and reproducing characteristics.

[Brief description of the drawings]

FIG. 1 is a perspective view of a disk cartridge according to the present invention as viewed from above.

FIG. 2 is a perspective view of the disc cartridge as viewed from below.

FIG. 3 is an exploded perspective view of the disk cartridge.

FIG. 4 is a sectional view showing a magnetic disk housed in the disk cartridge according to the present invention.

FIG. 5 is a plan view showing the inner surface of the upper half of the disk cartridge according to the present invention.

FIG. 6 is a plan view showing the inner surface of the lower half of the disk cartridge according to the present invention.

FIG. 7 is a sectional view of a disk cartridge according to the present invention.

FIG. 8 is a sectional view showing a liner used in the disk cartridge according to the present invention.

FIG. 9 is a plan view showing an inner surface of the upper half showing a rough surface formed on the upper half.

FIG. 10 is a plan view showing an inner surface of the lower half showing a rough surface formed in the lower half.

FIG. 11 is a schematic diagram illustrating a deflection angle θ of a magnetic disk.

FIG. 12 is a diagram for explaining a measuring method for measuring a deflection angle θ of a magnetic disk.

FIG. 13 is a sectional view showing a state in which a liner is attached to the inner surface of the lower half.

FIG. 14 is an enlarged sectional view of a main part showing a state where a liner is attached to the inner surface of the lower half.

FIG. 15 is a perspective view of the disc cartridge showing a state where an exhaust port provided in the cartridge body is opened.

FIG. 16 is a sectional view showing a state in which the disk cartridge according to the present invention is mounted on a disk recording / reproducing apparatus.

FIG. 17 is a sectional view showing a state where the magnetic head is in sliding contact with the magnetic disk.

FIG. 18 is a cross-sectional view schematically showing a state in which a liner provided in the cartridge body is bent and deformed and comes into contact with a magnetic disk.

[Explanation of symbols]

1 disk cartridge, 2 upper half, 3 lower half, 4 cartridge body, 5 magnetic disk, 8 center core, 25 central opening, 26
A first recording / reproducing opening, 27 a second recording / reproducing opening, 49,51 liner, 52 liner body,
53 heat-sensitive adhesive layer, 54, 55 adhesive part, 56, 5
7 Non-adhesive part 60,61 bite part

Claims (5)

[Claims] 1. A disc-shaped recording medium provided with a clamp portion for clamping to a rotation drive mechanism at a center portion, and a pair of upper and lower halves for rotatably storing the disc-shaped recording medium, An opening for recording / reproducing is provided on the lower surface side so that at least a part of the signal recording area of the disk-shaped recording medium faces outward in the radial direction. A central opening is provided to allow the provided clamp portion to face outward, a cartridge body having opposing surfaces formed flat, and a non-breathable heat-sensitive adhesive layer provided on one surface side, The heat-sensitive adhesive layer has an adhesive portion adhered to the inner surface of the cartridge main body, and a non-adhesive portion that can be released from the inner surface of the cartridge main body so as to sandwich the disc-shaped recording medium. A liner provided on each of opposed inner surfaces of the cartridge body, wherein the liner is arranged to bite into opposed inner surfaces of the cartridge body at a boundary between the bonded portion and the non-bonded portion. A disk cartridge characterized by being provided. 2. An angle between an inner surface of the cartridge body and a biting surface of the liner is 90 ° to 1 °.
It is in the range of 5 ° and the bite depth is 0.05-0.5m
2. A disk cartridge according to claim 1, wherein said disk cartridge is provided so as to bite into opposing inner surfaces of said cartridge main body so as to have a range of m. 3. The non-adhesive portion of the liner is ± 30 ° from a center line passing through the center of the cartridge body and dividing the recording / reproducing opening into two parts on both sides of the recording / reproducing opening.
2. The disk cartridge according to claim 1, wherein the disk cartridge is formed in an area excluding the range of the above. 4. The liner has a stiffness value of 0.5.
2. The disk cartridge according to claim 1, wherein the weight is in a range of 5 to 10 g. 5. The liner has a thickness of 0.2 to 0.7 m.
^2. The disk cartridge according to claim 1, wherein the distance is within a range of m (under a load of 5 g / cm ² ).