JP2000067553A - Disk cartridge - Google Patents

Abstract

PROBLEM TO BE SOLVED: To perform the cleaning of a recording medium without imparting a large load on the medium by allowing a liner to have a thermosensitive layer, an adhesive part to be adhered to the inside surface of a cartridge main body and an adhesive part separatable from the inside surface of the cartridge main body and making rough the inside surface facing to the non-adhesive part of the cartridge main body. SOLUTION: The pressure P1 between a liner 51 of the side of a lower half 3 and a magnetic disk 5 is also increased by allowing the non-adhesive part 55 of the liner 51 arranged at the side of the lower half 3 to float, and the disk 5 is rotated by receiving a force such as that the disk floats to the side of an upper half 2. On the other hand, since the non-adhesive part 54 of the liner 49 arranged at the side of the upper half 2 is deflectedly deformed to the side of the disk 5 by the gravity, the part 54 is brought into contact with the disk 5 being rotated while receiving the force that makes it float to the side of the upper half 2. Portions of the liners 49, 51 are brought into contact with both principal surfaces of the disk 5 in this manner to clean the disk 5. At the time of the cleaning, dust or the like generated from the disk 5 are discharged from a discharging port together with airflow to be sucked into the cartridge main body.

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 non-woven fabric or the like are disposed on the inner surfaces of the upper and lower halves constituting the cartridge body in order to clean the magnetic disk housed in the cartridge 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. In addition, a part of the liner disposed on the inner surface side of the lower half is formed 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 portion provided on the upper half. Is lifted to the magnetic disk side. 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.

[0009] 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. When the rotation speed of the drive motor increases, the drive torque decreases. When the load applied to the magnetic disk increases even slightly, stable rotation cannot be performed, and the magnetic disk cannot be rotated at a predetermined rotation speed. Then, there is a possibility that the recording and reproduction of the information signal on the magnetic disk with good recording and reproduction characteristics may not be performed.

An object of the present invention is to provide a disk cartridge capable of rotating in a stable state while protecting a disk-shaped recording medium housed in a cartridge body.

Another object of the present invention is to perform reliable cleaning of dust generated in a cartridge body containing a disk-shaped recording medium while realizing stable rotation of a disk-shaped recording medium rotated at a high speed, It is an object of the present invention to provide a disk cartridge capable of surely protecting a state recording medium.

Still another object of the present invention is to provide a disk cartridge capable of rotating a disk-shaped recording medium stably without applying a large load to a drive motor constituting a disk rotation drive mechanism.

[0013]

SUMMARY OF THE INVENTION A disk cartridge according to the present invention proposed to achieve the above object has a disk provided with a clamp for clamping to a rotary drive mechanism at the center. And a cartridge body formed by butt-connecting a pair of upper and lower halves for rotatably storing the recording medium. At least a lower surface of the cartridge body is provided with a recording / reproducing opening that exposes at least a part of the signal recording area of the disk-shaped recording medium outward in a radial direction, and a central portion on the lower surface side of the cartridge body. Is provided with a central opening that allows a clamp provided on the disk-shaped recording medium to face outward. A liner having a non-breathable heat-sensitive adhesive layer on one surface side is provided on the opposing inner surfaces of the cartridge body so as to sandwich the disk-shaped recording medium. These liners have an adhesive portion where the heat-sensitive adhesive layer is adhered to the inner surface of the cartridge body and a non-adhesive portion that can be released from the inner surface of the cartridge body, and at least a part of the inner surface facing the non-adhesive portion of the cartridge body. The surface is rough.

Since the inner surface of the cartridge body opposite to the non-adhesion portion is roughened, the non-adhesion portion is prevented from being adhered to the inner surface of the cartridge body, and is separated from the inner surface of the cartridge body to form a disk-shaped recording medium. The medium can be reliably contacted.

Here, the rough surface formed on the inner surface of the cartridge body has an average roughness of 5 to 20 μmRz.

The non-adhesive portion of the liner is located in a region upstream of the opening when the rotating disk-shaped recording medium rotates toward the recording / reproducing opening in the cartridge body. You.

In the liner, a bent portion is formed at a boundary portion between a portion to be bonded to the cartridge body and a non-bonded portion or at a position near the boundary portion and opposed to a flat surface of the cartridge body. The bent portion is formed by pressing a protrusion provided on a heat welding horn for bonding the liner to the inner surface of the cartridge body.

[0018]

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 and 3, which are formed in a substantially rectangular shape by injection molding of a synthetic resin or the like, are butt-connected and provided with a cartridge body 4. A magnetic disk 5 serving as a recording medium for an information signal is accommodated therein.

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 3.30 in which a magnetic layer is applied to both surfaces of a flexible thin synthetic resin film. A disk body 6 of 5 inches is provided. At the center of the disk body 6, as shown in FIG.
A center hole 7 is formed, and a center core 8 is attached so as to fit in 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 mounting portion to the disk main body 6 is integrally formed on the upper end side of the disk. The bottom portion 9a of the bulging portion 9 has a spindle shaft insertion hole 11 through which a spindle shaft constituting a disk rotation drive mechanism is inserted, and an insertion hole drive pin insertion hole 12 into which a drive pin provided on the disk rotation drive mechanism engages. Has been drilled. Around the spindle shaft insertion hole 11 and the drive pin insertion hole 12, rising walls 11a,
12a are formed. These rising walls 11a,
12a supports the spindle shaft and the peripheral surface of the drive pin on a wide surface, and has a spindle shaft insertion hole 11 and a drive pin insertion hole 1
2 is securely engaged with the spindle shaft and the drive pin in a stable state.

At the bottom 9a of the bulging portion 9, a disk mounting portion 13 is formed on a disk table of a disk rotation drive mechanism. The disc mounting portion 13 is provided at the bottom 9 of the bulging portion 9.
a is provided so as to be fitted to the disk table, thereby preventing the mounting position of the magnetic disk 5 with respect to the disk table from shifting.

The center core 8 configured 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 is 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, the cartridge main body 4 for accommodating the magnetic disk 5 constructed as described above is made up of a pair of upper and lower parts formed in a substantially rectangular shape by injection molding synthetic resin. 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, magnetic disks 5 are provided on the inner surfaces of the upper half 2 and the lower half 3 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 attached to the magnetic disk 5 housed in the cartridge body 4 is provided at the center of the lower half 3 constituting the lower surface 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.

Further, the upper half 2 and the lower half 3, which constitute the upper surface of the cartridge body 4, are opposed to each other.
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. These recording / reproducing openings 26 and 27 are located at the center in the left-right direction of the cartridge body 4 and are formed in 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. Have been. 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 main 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 main 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 arranged in the cartridge main body 4 with one end locked to the cartridge main body and the other end locked to a spring locking section provided on the first cartridge holding section 32. , Shutter member 28
Are urged in the direction of arrow B in FIGS. 1 and 2 to close the first and second recording and reproducing openings 26 and 27.

Upper half 2 constituting 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 regulating rib 45 comes into contact with the bottom 9 a of the bulging portion 9 of the center core 8, and the center located on the upper surface side of the disk body 5. The flange portion 10 of the core 8 is prevented from contacting the inner surface of the upper half 2, and the metal center core 8 is prevented from cutting the synthetic resin upper half 2 to generate shavings.

As shown in FIG. 7, an annular concave portion 46 into which the flange portion 10 of the center core 8 enters when the magnetic disk 5 is supported by the disk regulating rib 45 is formed around the outer periphery of the disk regulating rib 45. Have been.
By forming the annular concave portion 46 in this manner, it is possible to prevent the flange portion 10 from contacting the inner surface of the upper half 2 while reducing the thickness of the cartridge body 4. 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.
2 and a ring-shaped rib 4 forming a liner mounting portion 47
8 are protruded. A region surrounded by the storage portion forming wall 22 and the rib 48 is a liner mounting portion 47 formed on a flat surface. The liner arrangement part 47 includes
As shown in FIG. 2, a liner 49 for cleaning the magnetic disk 5 housed in the cartridge body 4 and protecting the magnetic disk 5 is provided. This liner 49
Is formed in a ring shape having a size to cover the main surface of the disk main body 6 constituting the magnetic disk 5, and a portion corresponding to the first recording / reproducing opening 26 as shown in FIG. 3 and FIG. Then, the notch 4 is opened so as to open the opening 26.
9a is provided.

A region surrounded by the storage portion forming wall 23 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.
This liner 51 is also formed in a ring shape large enough to cover the main surface of the disk main body 6 constituting the magnetic disk 5 and has a portion corresponding to the second recording / reproducing opening 27 in FIGS. As shown in FIG. 7, a notch 51a is provided to open the opening 27.

The liners 49, 51 disposed on the opposing inner surfaces of the upper half 2 and the lower half 3 have cutouts 49a, 49a at the portions corresponding to the first and second recording and reproducing openings 26, 27. 51a are formed, and these notches 49a,
Opposite sides of 51a are free ends.

As shown in FIG. 8, the liners 49 and 51 used on one side of the air-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) on one surface side of the liner main body 81. 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.

When the liners 49 and 51 are joined to the upper and lower halves 2 and 3, the polymer material having the heat-sensitive adhesive property constituting the heat-sensitive adhesive layer 53 contacts 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.

The liners 49, 51 are joined to the opposing inner surfaces of the upper half 2 and the lower half 3, with the heat-sensitive adhesive layer 53 side as an adhesive surface, as shown in FIGS.

The liners 49 and 51 pass through the center O of the cartridge body 4 and have first and second recording and reproducing openings 26 and 2 provided in the upper and lower halves 2 and 3, respectively.
When dividing the cartridge main body 4 along 7 to the center line L ₀ Ruru be divided into two recording magnetic disk 5 rotating in FIGS. 5 and 6 in the direction of arrow R ₁ in the cartridge main assembly 4 is in the first and second Non-adhesive portions 54 and 55 are located at the upstream region where they rotate toward the playback openings 26 and 27.
The magnetic disk 5 is bonded to the inner surfaces of the upper and lower halves 2 and 3 as bonding portions 56 and 57, respectively, where the magnetic disk 5 is located in the downstream region of the cartridge main body 4 retreating from the openings 26 and 27.

The non-adhesion portions 54 and 55 are formed by upper and lower halves 2 and 3 respectively.
The magnetic disk is separated from the inner surface of the magnetic disk 5, and is deformed to come into contact with the main surface of the magnetic disk 5 which is driven to rotate in the cartridge main body 4, thereby cleaning the magnetic disk. Therefore, the non-bonded portions 54 and 55 are
When the disk is driven to rotate, it is detached from the inner surfaces of the upper and lower halves 2 and 3 so as to have a length that can bend and deform and contact the main surface of the magnetic disk 5 that is driven to rotate.

When the liner body 52 is made of a nonwoven fabric mainly composed of cellulose fiber such as rayon (trade name), and the liners 49 and 51 using the heat-sensitive adhesive layer 53 made of ethylene vinyl acetate are used. As shown in FIGS. 5 and 6, the first and second non-adhesive portions 54 and 55 pass through the center O of the cartridge body 4.
Center line L _{0 that} divides the recording / reproducing openings 26 and 27 of FIG.
The magnetic disk 5 which is driven to rotate from the openings 26, 2
And about 40 on the upstream side to enter the magnetic head
It provided through an angle theta ₁ and theta ₂ in the range of degrees to 45 degrees.

The range of the non-adhesive portions 54 and 55 is appropriately selected according to the stiffness of the liners 49 and 51 to be used, and the first and second recording / reproducing openings 26 and 2 are selected.
If the angle exceeds 180 degrees from the center line L _{0 that} divides the magnetic disk 7 into two parts, the magnetic disk 5 is not stably held at a fixed position and may hinder the rotation of the magnetic disk 5. Set in range.

The non-adhesive portions 54 of the liners 49, 51
The portions other than 55 are, as shown in FIGS. 5 and 6, adhesive portions 56 and 57 to the inner surfaces of the upper and lower halves 2 and 3.

As shown in FIGS. 9 and 10, rough surfaces 58, 51 are provided on the inner surfaces of the upper and lower halves 2, 3 on which the liners 49, 51 are respectively provided, where the non-adhesive portions 49, 51 face each other. 59 are formed. These rough surfaces 58, 59
The load of the magnetic disk 5 or the like is applied to the liners 49 and 51 provided with the heat-sensitive adhesive layer 53 on the sides facing the inner surfaces of the upper and lower halves 2 and 3, and the non-adhered portions 56 and 57 are
To prevent the upper and lower halves 2 and 3 from being released from the inner surface.

Therefore, the rough surfaces 58 and 59 are
51 are provided substantially corresponding to the portions where the non-adhesion portions 54 and 55 are formed. As shown in FIGS. 9 and 10, the first and second cartridges 51 pass through the center O of the cartridge body 4. A center line L for dividing the recording / reproducing openings 26 and 27 into two
_The magnetic disk 5, which is driven to rotate from _0, has openings 26,
Almost 4 in the upstream side to enter the magnetic head
It is provided over a range of angles α ₁ and α _{2 from} 0 degrees to 45 degrees.

Note that the rough surfaces 58 and 59 are
55, the non-adhesive portion 54,
55, the first and second recording / reproducing openings 26,
27 to 180 degrees from the center line L ₀ to 2 split, preferably formed in a range of less than 100 degrees.

Here, the liners 49 and 51 using the liner body 52 made of a nonwoven fabric mainly composed of cellulose fiber such as rayon (trade name) and the heat-sensitive adhesive layer 53 made of ethylene vinyl acetate are used. FIG.
As shown in FIGS. 1 and 12, the test pieces were placed on test plate materials 101 having different surface roughnesses (Rz), and liners 49 and 51 were placed.
A weight 102 of about 3 g, which is about twice as heavy as the center core 8 attached to the 3.5-inch magnetic disk 5
After storing for 1 week in a high-temperature and high-humidity environment at a temperature of 60 ° C. and a humidity of 90%, the temperature is returned to normal temperature, and
1 was lifted, and the state of sticking to the plate material 101 was visually checked.

At this time, the liners 49 and 51 are placed with the heat-sensitive adhesive layer 53 side facing the surface of the plate material 101. The plate material 101 was formed of the same ABS resin as the material constituting the upper and lower halves 2 and 3.

As a result, when the liners 49 and 51 are placed on the plate material 101 having a mirror-finished surface, traces of sticking are observed, and the liners 49 and 51 are placed on the plate material 101 having a surface roughness of 3 to 4 μm Rz. , A slight sticking trace was observed.

The surface roughness is 8 to 10 μm Rz, 12 to 1
When the liners 49 and 51 were mounted on the plate material 101 of 5 μmRz and 17 to 19 μmRz, no sticking trace was observed at all.

When the plate 101 having a surface roughness of more than 20 μmRz is formed by molding ABS resin,
Molding defects occur, such as large projections and the like caused by uneven release from the molding die.

From the above results, the non-adhered portions 56, 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.

Further, the bonding portions 5 of the liners 49, 51 provided on the inner surfaces of the upper and lower halves 2, 3 to the upper and lower halves 2, 3 are provided.
As shown in FIGS. 5 and 6, bent portions 61 and 62 are provided at or near the boundaries between the non-adhesive portions 54 and 55 and the non-adhesive portions 54 and 55. These bent portions 61,
62 is formed by linearly compressing a part of the liner main body 52 made of a nonwoven fabric constituting the liners 49 and 51 over the inner and outer circumferences.

At this time, the bent portions 61 and 62 are provided at positions corresponding to flat surfaces other than the rough surfaces 58 and 59 on the inner surfaces of the upper and lower halves 2 and 3. The bent portions 61 and 62
By being provided on the flat surfaces of the upper and lower halves 2 and 3, they are joined to the upper and lower halves 2 and 3, so that the boundaries between the bonded portions 56 and 57 and the non-bonded portions 54 and 55 can be clearly separated. it can. The bent portions 61 and 62 formed by compressing a part of the liner main body 52 have higher rigidity than the non-adhered portions 54 and 55. Therefore, the non-adhered portions 54 and 55 have the bent portions 61 and 62 as fulcrums. It becomes bent and deformed.

As described above, the bonding portions 56 and 57 and the non-bonding portions 54 and 55 are provided, and the bent portions 61 and 62 are formed at the boundaries between the bonding portions 56 and 57 and the non-bonding portions 54 and 55, and Liners 49,5 arranged on the inner surfaces of halves 2,3
1 is joined to the inner surfaces of the upper and lower halves 2 and 3 by using a heat welding device using ultrasonic waves as shown in FIGS.

Here, a state in which the liner 51 is joined to the lower half 3 will be specifically described. Liner 5 on lower half 3
To attach 1, as shown in FIGS. 13 and 14,
The lower half 3 is welded to the welding table 11 of the heat welding apparatus with the inner surface facing upward.
1, a ring-shaped liner 51 is positioned and placed on the inner surface of the lower half 3 so as to surround the central opening 25. Here, the heat welding horn 102 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 melt is bonded to the inner surface of the lower half 3. The lower half 3 of the liner 51 is attached to the inner surface.

The heat welding horn 112 used here
Is formed in a size substantially corresponding to the outer shape of the liner 51, a cutout step 113 is formed in a portion corresponding to the non-adhesive portion 55 of the liner 51, and a contact surface 114 for applying ultrasonic waves is When it comes into contact with 57, it is formed so as not to come into contact with the portion corresponding to the non-adhesive portion 55.

In the center of the heat welding horn 112, there is formed a recess 115 which escapes the center opening 25.

Further, a protrusion for forming a bent portion 62 is formed at the boundary between the notch step 113 corresponding to the non-adhesive portion 55 and the contact surface 114 on the tip end side of the heat welding horn 112. A part 116 is formed.

The heat welding horn 11 thus formed
14 is applied to a liner 51 disposed on the inner surface of the lower half 3 as shown in FIG. 14, and ultrasonic waves are applied.
Is melted and adhered to the inner surface of the lower half 3 to form an adhesive portion 57, and no ultrasonic wave is applied to the heat-sensitive adhesive layer 53 in a portion corresponding to the notch step portion 113, and the inner surface of the inner head of the lower half 3 is It is left as the non-adhesion part 55 where the adhesion is not performed. At this time, the protrusion 11 provided on the heat welding horn 112
6 is pressed more strongly against the liner 51 than other portions, and the portion of the liner main body 52 where the protrusion 116 is pressed is compressed and thermally deformed to form a bent portion 62.

The heat welding horn 1 formed as described above
12, the non-adhesive portion 55 and the adhesive portion 57 are provided, and the bent portion 62 is formed at the same time.
1 can be attached to the lower half 3.

Incidentally, the disk cartridge 1 shown here has an exhaust port 65 for exhausting the air in the disk storage section 21, which is a space surrounded by the partition wall 22, to the outside of the cartridge body 4, and this exhaust port 65. , An exhaust passage 66 is formed. The exhaust port 65 is as shown in FIG.
As shown in FIG. 1, a part of the front wall 15 of the cartridge body 7 is cut away, and the shutter member 28 is provided with the first and second recording / reproducing openings 26, as shown in FIGS.
When the shutter member 28 is in a position to close the shutter member 27, the shutter member 28 is covered with a part of the shutter member 28, and the shutter member 28 is moved to the first position as shown in FIG.
And the second recording / reproducing openings 26 and 27 are provided at positions where they are opened when they are moved to positions where they are opened.

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, 27, it protrudes to the side of the first and second shutters 26, 27. 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 faces 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.

The communication between the disk storage section 21 and the exhaust port 65 is established, and the air in the disk storage section 21 is
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 the exhaust passage 66 extending from the partition wall 22 to the exhaust port 65, an air flow guide section for guiding air flowing from the disk storage section 21 to the exhaust port 65 is provided. 67 are provided.

Incidentally, 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 flow guide wall 67 is designed to guide the air in the disk storage section 21 to the exhaust port 65 without fail.
It is provided on one side of the exhaust passage 66 facing the air flow. By providing the air flow guide wall 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 flow guide wall 67, The air is guided by the air flow guide wall 67 to the exhaust port 65, and the air is exhausted to the outside of the cartridge body 4 through the exhaust port 65.

Since the air in the disk storage section 21 is exhausted from the cartridge body 4 as the magnetic disk 5 rotates, the dust entering the disk storage section 21 is removed together with the air exhausted from the cartridge body 4. It can be discharged from the cartridge body 4.

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. The first and second positioning reference holes 69, 7 with which
0 is provided. These positioning reference holes 69, 70
Are provided on both sides of the front wall 15 in the direction in which the shutter member 28 moves, and the first positioning reference hole 69 is formed in a circular shape corresponding to a positioning pin having a circular cross section, The second positioning reference hole 70 is formed as a long hole having a long moving direction of the shutter member 28 so that the position of engagement 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 on the side of the rear wall 16 and the first positioning reference hole 69, 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, the disk cartridge 1 according to the present invention is mounted on 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. A prohibited mounting restricting section 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 main 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, as shown in FIG. 16, the first and second positioning reference holes are provided. 69, 70 are positioning pins 8 provided on the disk recording / reproducing apparatus side.
1 and 82, the horizontal position is achieved, and the mounting height position is determined by supporting the corner portion on the rear wall 16 side of the cartridge main body 4 by a height positioning (not shown) and a pin. .

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, the spindle shaft 85 of the disk rotation drive mechanism 83 is inserted, and the drive pin 76 is further inserted into the drive pin insertion hole 12. At this time, the center core 8 is
a to the disk table 74.
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 magnetic disk 6 and becomes rotatable integrally with the disk table 84. At this time, the magnetic disk 5 is mounted on the disk table 84 via the concave disk mounting portion 13 provided on the center core 8, so that the mounting position of the magnetic disk 5 with respect to the disk table 84 can be prevented and the spindle 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 6 can be inserted into the drive pin insertion hole 12.

When a spindle motor (not shown) constituting the disk rotation drive mechanism 73 is driven in a state where the magnetic disk 5 is rotatable integrally with the disk table 84, the magnetic disk 5 is rotated about a spindle shaft 75. It is driven to rotate in synchronization with the rotation of the disk table 74.

When the disk cartridge 1 is mounted on the disk recording / reproducing apparatus, the shutter member 28 is opposed to the biasing 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 with the positioning in the horizontal direction and the height direction. The spindle 85 is inserted through the spindle shaft insertion hole 11 and the driving pin is inserted into the driving pin insertion hole 12. 86 are engaged, and the magnetic disk 5 is
When the magnetic disk 5 is placed on the disk table 84 so as to be rotatable in synchronism with the magnetic disk 5, the magnetic disk 5
As shown in FIG. 6, the cartridge body 4 floats from the lower half 3 side constituting the cartridge body 4 and is located at a substantially middle position in the thickness direction of the cartridge body 4.

At this time, the non-adhesive portion 54 of the liner 49 disposed on the upper half 2 side is freely bent by its own weight toward the lower half 3 along the bent portion 62, and substantially in the thickness direction of the cartridge body 4. It contacts one main surface of the magnetic disk 5 located at the intermediate position.

Here, the magnetic disk 5 positioned and mounted on the disk rotation drive mechanism 73 has at least 3
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 from the center opening 25 provided on the lower surface side of the cartridge body 4, FIGS.
It acts to suck air in the direction of the arrow S in the middle. 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, which forms 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 not adhered to the inner surface of the lower half 3 and the liner 51 disposed on the lower half 3 side. Flows into the space 55. At this time, since the non-breathable heat-sensitive adhesive layer 53 is provided on the surface of the non-adhesive portion 55 facing the inner surface of the lower half 3, the inner surface of the lower half 3 and the non-adhesive portion 55 of the liner 51 are provided. The air that has flowed in between passes through the liner 51,
As shown in FIG. 18, a spiral air flow R _{2 is} formed between the inner surface of the lower half 3 and the non-adhered portion 55 of the liner 51.
And the pressure P ₀ between the inner surface of the lower half 3 and the non-bonded portion 55 of the liner 51 is made larger than the pressure P ₁ between the liner 51 and the magnetic disk 5. Due to this pressure difference, the non-adhered portion 55 of the liner 51 is bent and deformed as shown in FIGS. 18 and 19 and comes into contact with the other main surface of the magnetic disk 5.

The liner 51 provided 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 the non-adhesive portion 55 is rotated by receiving a force to float on the upper half 2 side. You. On the other hand, as shown in FIGS. 17 and 19, the non-adhesive portion 54 of the liner 49 disposed on the upper half 2 side is bent and deformed toward the magnetic disk 5 by its own weight, so that it floats on the upper half 2 side. The magnetic disk 5 contacts the rotating magnetic disk 5 under such a force.

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.

The air sucked into the cartridge main body 24 is exhausted from the exhaust port 65 as an air flow when the magnetic disk 5 is driven to rotate. 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, an exhaust port 65 for exhausting the air in the cartridge body 4 is provided, but the exhaust port 65 is not always required.

Further, in the case of a disk-shaped recording medium in which the center hub 8 is not attached to the center hole 7 of the disk body 6 like the magnetic disk 5, 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.

Although the above-described disk cartridge 1 has been described with an example in which the magnetic disk 5 is stored, the present invention uses not only a disk cartridge storing 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.

[0094]

As described above, in the disk cartridge according to the present invention, a part of the liner provided in the cartridge main body is bent and deformed to come into contact with the disk-shaped recording medium which is driven to rotate in the cartridge main body. Therefore, cleaning can be performed without imposing a large load on the disk-shaped recording medium that is driven to rotate.

Since a large load is not applied to the disk-shaped recording medium which is driven to rotate, stable rotation driving of the disk-shaped recording medium is guaranteed, and the recording / reproducing means for recording / reproducing information signals and the disk-shaped recording medium are used. Can be maintained in a constant state, and information signals can be recorded and reproduced with good recording and reproduction 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 plan view illustrating a state in which the sticking of the liner is tested.

FIG. 12 is a cross-sectional view taken along the line XII-XII of FIG. 11, showing a state in which the sticking of the liner is tested. FIG.

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 according to the present invention, 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 the disk recording / reproducing apparatus and the magnetic disk is driven to rotate.

FIG. 17 is a cross-sectional view showing a state in which the disk cartridge according to the present invention is mounted on the disk recording / reproducing apparatus, and the non-adhesive portion of the liner on the upper half side is bent.

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.

FIG. 19 is a cross-sectional view showing a state where the magnetic disk is rotated and the non-adhesive portion of the lower half-side liner is bent and comes into contact with the magnetic disk.

[Description of Signs] 1 Disk cartridge, 2 Upper half, 3 Lower half, 4 Cartridge main 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 non-adhesive part of liner,
56, 57 Adhesive part of liner 61, 62 Bent part.

Claims (6)

[Claims] 1. A disk-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 disk-shaped recording body, 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 cartridge body provided with a central opening that allows the provided clamp portion to face outward; A liner disposed on opposed inner surfaces of the main body, wherein the liner includes an adhesive portion in which the heat-sensitive adhesive layer is adhered to an inner surface of the cartridge body and the car A disc cartridge comprising: a non-adhesive portion that can be released from an inner surface of a cartridge main body; 2. The disk cartridge according to claim 1, wherein the rough surface formed on the inner surface of the cartridge body has an average roughness of 5 to 20 μmRz. 3. The non-adhesive portion of the liner, when the disk-shaped recording medium rotating in the cartridge body rotates toward the recording / reproducing opening, is located upstream of the opening. 2. The disc cartridge according to claim 1, wherein the disc cartridge is located in an area. 4. The method according to claim 1, wherein the rough surface formed on the inner surface of the cartridge body is formed over a range of 100 degrees or less from a center line of the cartridge body which divides the recording / reproducing opening into two. The disk cartridge according to claim 3, wherein: 5. The cartridge according to claim 1, wherein the liner has a bent portion at or near a boundary between the bonded portion and the non-bonded portion, and a portion facing a flat surface of the cartridge body. The disk cartridge according to claim 1, wherein: 6. The disk according to claim 5, wherein the bent portion is formed by pressing a protrusion provided on a horn for hot welding for bonding the liner to an inner surface of the cartridge body. cartridge.