JP2002313047A - Disk cartridge - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a disk cartridge by which the occurrence of an error in the case of recording and reproducing can be reduced by preventing sticking of dust, etc., to the recording surface of a disk medium. SOLUTION: In the disk cartridge provided with a shutter member capable of opening and closing a spindle shaft insertion hole and a head insertion hole formed at least at one side of a case housing the disk-like disk medium rotatably, an exhaust hole is bored at the case and a filter member is provided inside of the exhaust hole.

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 rotatably storing a disk-shaped disk medium used as a recording / reproducing medium of an information processing apparatus or the like and for preventing intrusion of dust and the like.

[0002]

2. Description of the Related Art For example, disc-shaped disk media such as optical disks and magneto-optical disks are used as portable recording and reproducing media for computers. Such a disk medium, when performing recording or playback,
By irradiating the recording surface with laser light while rotating in the state loaded in the drive device, information is recorded by pit formation, phase change, magnetization, etc. due to decomposition of the dye layer on the recording surface, or reflection of laser light. The recorded information is reproduced based on the difference between the ratio and the polarization angle.

[0003] In such a disk medium,
In order to increase the recording capacity, it has been proposed to shorten the wavelength of a laser beam applied to a recording surface. When recording or reproducing information using this short-wavelength laser light (for example, blue-violet laser), in order to suppress the attenuation of the laser light by the cover layer that protects the recording surface of the disk medium, It is necessary to reduce the thickness. When the thickness of the cover layer is reduced in this way, the diameter of the laser beam on the surface of the cover layer (exposed surface to the outside) is reduced, and the influence of dust and the like adhering to the cover layer surface cannot be ignored.

[0004] For this reason, a disk cartridge which accommodates the disk medium in a case and prevents dust and the like from adhering to the disk medium is employed. Such a disc cartridge includes a center hole provided at the center of the disc medium and an opening for exposing a part of the recording surface (cover layer) to the outside, and a shutter member for opening and closing the opening. It is configured.

Thus, in the disk cartridge,
Usually, the opening is closed by a shutter member to prevent dust and the like from entering the disk cartridge, that is, to prevent dust and the like from adhering to the disk medium. The holding of the hole by the rotating spindle shaft and the proximity of the laser head to the recording surface (irradiation of laser light) are enabled.

[0006]

The disk medium accommodated in the above-described disk cartridge is rotated at a high speed by a drive device. That is,
After being loaded into the drive device, the center hole is held by the rotating spindle shaft and rotated at high speed. Therefore, a vortex air flow (entrained air flow) flows from the center of the disk medium to the outer peripheral edge in the disk cartridge.
Occurs.

That is, the air flow is caused by the air flowing from the opening for inserting the rotary spindle shaft flowing out from the opening for inserting (proximity) to the laser head and the difference in the linear velocity of rotation of the disk medium. Are generated so as to spirally flow from the center side toward the outer peripheral side. Therefore, dust and the like enter the disk cartridge with the air flow, and an error may occur during recording and reproduction due to the dust and the like adhering to the recording surface.

Accordingly, the present invention provides a disk cartridge capable of suitably trapping such dust and the like, preventing the disk medium from adhering to the recording surface, and reducing the occurrence of errors during recording / reproduction. The purpose is to obtain.

[0009]

To achieve the above object, a disk cartridge according to the first aspect of the present invention is formed on at least one surface of a case that rotatably accommodates a disk-shaped disk medium. In a disk cartridge having a shutter member capable of opening and closing the spindle shaft insertion hole and the head insertion hole, an exhaust hole is provided in the case, and a filter member is provided inside the exhaust hole.

According to this, the air that enters through the spindle shaft insertion hole and the head insertion hole and flows on the recording surface of the disk medium passes through the filter member provided in the case and is exhausted from the exhaust hole. Dust and the like contained in the airflow are effectively trapped by the filter member, and the inside of the case is not contaminated. In addition, since the air in the drive device becomes clean and the dust and the like contained in the air flowing into the recording surface of the disk medium again decreases, the adhesion of the dust is prevented, and an error caused by dust and the like during recording / reproduction is prevented. Occurrence can be reduced.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a disk cartridge according to an embodiment of the present invention will be described in detail with reference to the embodiments shown in FIGS. For convenience of description, the direction of loading (inserting) the disk cartridge into the drive device is defined as the front direction (FR), and the rear direction (RE), upward direction (UP), downward direction (LO), left direction (LE) and rightward (RI) will be described below.

First, an outline of the disk cartridge 10 will be described. As shown in FIG. 1, the disk cartridge 10 is formed in a flat case shape as a whole, and has a disk-shaped disk as an information recording / reproducing medium inside. The medium 20 is stored. The front end portion 10A is curved in an arc shape, and the rear end portion 10B is formed in a polygonal shape in which left and right corners are cut out, and the front-rear length is formed slightly larger than the left-right length. Thus, the loading direction of the disc cartridge 10 into the drive device (not shown) can be easily recognized from the appearance, and the loading into the drive device from the wrong direction is not allowed.

A first guide groove 12A and a second guide groove 12B are provided on the left and right side surfaces of the disk cartridge 10, respectively, for guiding when the disk cartridge 10 is loaded into a drive device. The first guide groove 12A has a lock release lever 104 and a shutter engagement portion 18 to be described later.
Is protruding. In the vicinity of the rear end portion 10B of the lower surface of the disk cartridge 10, two position regulating holes 16 are provided.
Are provided for regulating (detecting) the position of the disk cartridge 10 in the drive device.

Further, an opening 14 is provided from the center of the lower surface of the disk cartridge 10 to the center in the left-right direction of the front wall of the front end 10A, so that the disk medium 20 can be accessed when the disk medium 20 is used. I have. That is, when the disk medium 20 is used, the rotary spindle shaft of the drive device and the recording / reproducing head (for example, a laser head) are inserted and approached through the opening 14. When the disk medium 20 is not used, the opening 14 is used. Is the disk cartridge 10
It is closed by the first shutter member 110 and the second shutter member 120 housed therein, so that intrusion of dust and the like into the disk cartridge 10 is prevented.

The disk cartridge 1 having such a configuration
0 is forward (in the direction of arrow FR) while being guided by the drive device in the first guide groove 12A and the second guide groove 12B.
From the drive unit. Then, along with this, the opening 14 is opened and the position regulating hole 16 is opened.
As a result, a position is detected and positioned in the drive device, and information recording on the disk medium 20 and reproduction of information recorded on the disk medium 20 are performed in the drive device.

Next, the detailed structure of the disk cartridge 10 will be described. As shown in the exploded perspective views of FIGS. 2 and 3, the disk cartridge 10 includes a disk medium 20. The disk medium 20 is formed in a disk shape having a center hole 22 at the center, and has a lower surface 2.
The recording surface formed in No. 4 is covered and protected by a cover layer (not shown). An annular center core portion 26 is attached to the center hole 22 of the disk medium 20 by bonding or the like. The center core portion 26 is engaged with or held by suction at the tip of the rotary spindle shaft of the drive device. You.

The disk medium 20 is accommodated in a case 30, and the case 30 is formed by joining a base plate 32 as a lower shell and an upper plate 34 as an upper shell. The lower portion of the base plate portion 32 is covered with a lower surface plate portion 36 as a cover plate portion, and a first shutter member 110 and a second shutter member 120 are provided between the base plate portion 32 and the lower surface plate portion 36. Is to be accommodated.

The base plate portion 32 is a thin plate having a front portion formed in a semicircular shape and a rear portion formed in a substantially rectangular shape circumscribing the remaining semicircular portion. A cylindrical wall 40 is provided upright at a predetermined height on the periphery of the semicircular portion and the rear semicircular portion. The inner diameter of the cylindrical wall 40 is slightly larger than the outer diameter of the disk medium 20. A substantially "U" -shaped peripheral wall 42 is provided upright on the outer peripheral edge of the substantially rectangular rear portion of the base plate portion 32. The peripheral wall 42 is connected to the rear wall 44, the left wall 46, and the right side. And a wall 48.

Further, cylindrical projections 54 are provided upright at both rear corners of the upper surface 32A of the base plate portion 32 between the cylindrical wall 40 and the peripheral wall 42, and are located near the left cylindrical projection 54. Is provided with a cylindrical shutter shaft hole 52 to support the second shutter member 120. Further, a spring holding portion 56 is provided near the shutter shaft hole 52 to hold one end of the torsion spring 124.

The base plate 32 has an opening 50 that forms the opening 14 of the disk cartridge 10. The opening 50 has a circular hub hole 50A having a diameter larger than the outer diameter of the center core portion 26 of the disk medium 20 and an outer peripheral front end thereof symmetrical in the radial direction of a semicircular portion of the base plate portion 32. And cylindrical wall 40
Rectangular recording / reproducing head window 50B with a notch
Are connected to each other. In addition, the hub hole 50A and the recording / reproducing head window 50B are not limited to those formed continuously, and may be formed separately.

A rib 60 having a thick upper surface 32A is provided around the periphery of the hub hole 50A of the base plate portion 32. A first shutter is provided near the left side of the hub hole 50A of the base plate portion 32. A pressing piece 112B of the member 110 and a shutter guide hole 62 into which the pressed piece 120B of the second shutter member 120 is inserted are provided.

As shown in FIG. 3, a substantially circular concave portion 32C is formed on the lower surface 32B of the base plate portion 32, and the shutter main body 1 of the first shutter member 110 is formed.
It is for accommodating the 12 and the second shutter member 120 and for forming an operation space. That is, the lower surface plate portion 36 is
The flat space is formed between the lower surface plate portion 36 and the concave portion 32C by being fitted to the peripheral wall 42 in a state of being in contact with 2B.

On the lower surface 32B of the base plate portion 32, at positions corresponding to the cylindrical protrusions 54, cylindrical protrusions 5 are provided.
A cylindrical projection 64 coaxially communicated with the inside of the disk cartridge 4 is provided so as to extend downward.
The position control hole 16 is 0.

The cylindrical wall 4 of the base plate portion 32 described above
The disk medium 20 is accommodated inside the area 0. The disk medium 20 is placed on the rib 60 with its center core 26 inserted into the hub hole 50A,
The contact between the upper surface 32A of the base plate portion 32 and the cylindrical wall 40 is prevented. In this state, the upper part of the base plate part 32 is covered with the upper surface plate part 34.

The upper surface plate portion 34 has a polygonal plate portion 38 in which the front end of a rectangular flat plate is curved in an arc shape, and the rear end of which is cut off at right and left corners. The front-rear length of the flat plate portion 38 is slightly larger than the left-right length.
An annular projection 66 corresponding to the second rib 60 is provided to prevent the disk medium 20 from contacting the lower surface 38A.

An annular groove 68 corresponding to the cylindrical wall 40 of the base plate portion 32 is formed on the lower surface 38A of the flat plate portion 38. The annular groove 68 is formed so that the cylindrical wall 40 can be inserted as a whole, and has a slightly wider front portion so that the arc-shaped guide wall portion 114 of the first shutter member 110 can be inserted.

Further, on the outer periphery of the front portion of the flat plate portion 38, an outer wall 80, which is formed in a substantially "U" shape in plan view, and stands upright so as to surround the front half of the annular groove 68. . The outer wall 80 has a height corresponding to the entire thickness of the disk cartridge 10, and includes a front wall 84, a left wall 86, and a right wall 88.

The front wall 84 is curved so as to correspond to the curved shape of the front end of the flat plate 38, and constitutes the front end 10 A of the disc cartridge 10. A rectangular window 70 is formed in the center of the disk cartridge 10. That is, the width of the window 70 in the left-right direction is the window 50 for the recording / reproducing head of the base plate 32.
It corresponds to the width of B and constitutes a part of the opening 14 of the disk cartridge 10.

On the outer surfaces of the left wall 86 and the right wall 88,
Lateral grooves 86A and 88A are formed along the front-rear direction, respectively, and the lateral grooves 86A and 88A constitute the front part of the first guide groove 12A and the front part of the second guide groove 12B, respectively. A lock release lever hole 92 is provided in the lateral groove 86A of the left wall 86. A shaft hole 58A for supporting the lock lever 100 is provided on the lower surface 38A of the flat plate portion 38 near the lock release lever hole 92. A holding hole 58B for holding one end of the torsion spring 108 is provided.

An inner wall 82 is provided inside the outer wall 80, and the lower end surface of the inner wall 82 is a contact surface with the upper surface of the lower plate 36 fitted to the outer wall 80. A peripheral wall 72 corresponding to the peripheral wall 42 of the base plate portion 32 is erected downward on the outer periphery behind the outer wall 80, and the peripheral wall 72 is formed by the rear wall 44 and the left wall of the base plate portion 32. Rear wall 74 and left wall 76 corresponding to 46 and right wall 48, respectively.
And a right wall 78.

The rear wall 74 comes into contact with the rear wall 44 of the base plate 32 to form the rear end 10B of the disc cartridge 10. The left wall 76 is in contact with the left wall 46 of the base plate 32 to form the rear left wall of the disc cartridge 10 and the rear of the first guide groove 12A, and the right wall 78 is formed of the base plate 32. Right wall 48
And constitutes the rear right wall of the disk cartridge 10 and the rear of the second guide groove 12B.

Although not shown, the left wall 46 and the left wall 76
Abuts the narrow groove provided inside the left wall 46 and the left wall 7
The shutter guide groove into which the shutter pull-out portion 118 of the first shutter member 110 is inserted is formed so as to face the narrow groove provided inside 6 and the shutter guide groove is formed in the left wall 76. Annular groove 6 near the front end
It is communicated with 8.

On the lower surface 38A of the flat plate portion 38,
At positions corresponding to the respective cylindrical projections 54 of the base plate portion 32 between the peripheral wall 72 and the annular groove 68, the columns 9 are provided.
4 are provided. The lower ends of the cylinders 94 are in contact with the upper ends of the cylindrical projections 54 of the base plate 32. A screw hole 94A is provided at the center of the cylinder 94, and a screw is screwed into the screw hole 94A from below the cylindrical projection 64, so that the upper surface plate portion 34 covers the upper portion of the base plate portion 32. It is attached in the state where it did.

That is, by this screwing, the upper plate 34 is attached to the front end surfaces of the left wall 46 and the right wall 48 of the base plate 32.
The rear end surfaces of the left wall 86 and the right wall 88 of the base plate 32 are in contact with each other, the peripheral wall 72 of the top plate 34 is in contact with the peripheral wall 42 of the base plate 32, and the cylindrical wall 40 of the base plate 32 is A case 30 which is connected and held in a state inserted into the annular groove 68 and rotatably accommodates the disk medium 20 is formed.

On the other hand, a lower surface plate portion 36 is provided below the base plate portion 32. The lower plate portion 36 is formed in a flat plate shape whose outer shape is substantially the same as the flat plate portion 38 of the upper plate portion 34, and its outer periphery is slightly smaller than the flat plate portion 38. A through hole 98 corresponding to the outer diameter of the cylindrical protrusion 64 of the base plate portion 32 is provided at a position corresponding to the cylindrical protrusion 64.

Accordingly, the lower plate 36 is formed with the through holes 9.
8, the cylindrical projection 64 of the base plate portion 32 is inserted, and the upper surface is formed on the lower surface 32B (the concave portion 32C) of the base plate portion 32.
And the outer wall 80 of the base plate portion 32 and the outer wall 80 of the upper plate portion 34 in a state of being in contact with the inner wall 82 of the upper plate portion 34. It is fitted and held on the peripheral surface.

The lower plate 36 is provided with the base plate 32.
An opening 90 having substantially the same shape as the opening 50 is formed at a position corresponding to the opening 50. That is, the opening 90 is composed of the hub hole 90A corresponding to the hub hole 50A and the recording / reproducing head window 90B corresponding to the recording / reproducing head window 50B, and constitutes the opening 14 of the disc cartridge 10. It has become.

As described above, the lower part of the case 30 accommodating the disk medium 20 is covered with the lower surface plate portion 36,
The opening 50 of the base plate 32, the window 70 of the upper plate 34, and the opening 90 of the lower plate 36 communicate with each other to form the opening 14 of the disk cartridge 10.
A shutter mechanism for closing or opening the opening 14 is provided in the case 30. In the following, when describing each component of the shutter mechanism using the front, rear, left, and right directions, it is basically based on the direction in which the opening 14 is closed.

The shutter mechanism is a first shutter member 11
0, and the first shutter member 110 includes a shutter body 112 for mainly closing the recording / reproducing head window 50B of the base plate 32. The shutter main body 112 is made of a thin flat plate such as a resin material or a metal plate, has a front-rear length substantially equal to the radius of the cylindrical wall 40 of the base plate portion 32 in plan view, and has a width larger than the width of the recording / reproducing head window 50B. It is slightly large, and has a substantially trapezoidal shape in which the front end is formed in an arc shape corresponding to the cylindrical wall 40 and the right rear corner is diagonally cut away. And the thickness is the depth of the recess 32C,
That is, the height from the lower surface 32B of the base plate portion 32 to the upper surface of the lower plate portion 36 is smaller.

Further, the end surface of the oblique side of the shutter body 112 is abutted against the second shutter member 120 by a contact portion 112A.
In the left rear corner of the shutter body 112,
A pressing piece 112 </ b> B that stands upright is provided, and is used for pressing the second shutter member 120. Furthermore,
The front end of the shutter main body 112 slides along the outer peripheral surface of the cylindrical wall 40 of the base plate portion 32 and a part of the recording / reproducing head window 50B of the base plate portion 32 (the front portion of the cylindrical wall 40). An arc-shaped guide wall portion 114 for closing the notch portion) is integrally erected upward, and the arc-shaped guide wall portion 114 has an arc shape corresponding to the outer periphery of the cylindrical wall 40 in plan view. ing.

At the right end of the arc-shaped guide wall portion 114, a window 9 whose lower side is cut out in a substantially rectangular shape and opened.
6 is provided integrally,
The window 96 of the overhang portion 116 corresponds to the window 70 of the upper plate portion 34. On the other hand, at the left end of the arc-shaped guide wall 114, a shutter drawer 118 is provided continuously. The shutter pull-out portion 118 has a thin plate shape thinner than the arc-shaped guide wall portion 114 and can be elastically deformed in the thickness direction, and a small block-shaped shutter engaging portion 18 is attached to a tip end thereof. . Further, a small hole 11 is provided at an intermediate portion of the shutter drawer 118.
8A is provided for engaging a lock claw 106 described later.

The shutter main body 112 of the first shutter member 110 has an arc-shaped guide wall portion 114 formed along with the cylindrical wall 40 of the base plate portion 32 along with the annular groove 6 of the upper plate portion 34.
8, the recess 32C of the base plate portion 32 is inserted.
And the upper surface of the lower plate portion 36. At this time,
The leading end of the shutter pull-out portion 118 is located in a shutter guide groove communicating with the annular groove 68, and the shutter engaging portion 1
Reference numeral 8 is located at a substantially central portion (the rear side of the left wall 86 of the upper surface plate portion 34) in the first guide groove 12A and is exposed to the outside. Accordingly, by moving the shutter engaging portion 18 rearward from the outside, the arc-shaped guide wall portion 114 slides along the outer peripheral surface of the cylindrical wall 40 via the shutter drawing portion 118, and the shutter main body 112 rotates. Is done.

The shutter mechanism includes a lock lever 100 for restricting the rotation of the first shutter member 110.
It has. The lock lever 100 is formed in a substantially “C” shape in plan view, and a support shaft 102 that is rotatably supported by a shaft hole 58 </ b> A of the upper surface plate portion 34 is provided at the center of the lock lever 100. One end of the lock lever 100 is a lock release lever 104 protruding from the lock release lever hole 92 into the first guide groove 12A (lateral groove 86A).
The other end is a lock claw 106 that can be engaged with the small hole 118A of the shutter drawer 118.

One end of a torsion spring 108 is locked to the support shaft 102 of the lock lever 100, and the other end of the torsion spring 108 is inserted and held in a holding hole 58B of the upper plate 34. . As a result, the lock lever 100 is constantly urged by the torsion spring 108 in the direction in which the lock claw 106 engages with the small hole 118A of the shutter drawer 118, so that the opening 14 is normally kept closed. . When the lock release lever 104 is pressed backward, the torsion spring 108
The lock lever 100 is rotated around the support shaft 102 against the urging force of the
The engagement state with the small hole 118A of No. 8 is released.

The shutter mechanism includes a second shutter member 120 mainly closing the hub hole 50A of the base plate portion 32.
It has. The second shutter member 120 is made of a thin flat plate such as a resin material or a metal plate, and has a substantially trapezoidal shape in plan view. The thickness of the first shutter member 110 is equal to that of the shutter body 112.

The end face of the oblique side of the front end of the second shutter member 120 has a contact portion 1A with the contact portion 112A of the shutter body 112 of the first shutter member 110.
20A, and at a position corresponding to the pressing piece 112B of the shutter body 112 of the abutting portion 120A,
The pressed piece 120B is erected upward (inside the case 30). The pressed piece 120 </ b> B always keeps the pressing piece 1 within the rotation range of the shutter body 112 (the moving range of the pressing piece 112 </ b> B regulated by the shutter guide hole 62).
12B.

Further, the second shutter member 120 has a rotating shaft 122 erected upward at the right rear end thereof. The rotation shaft 122 corresponds to the shutter shaft hole 52 of the base plate portion 32, and has a sliding 122 at its upper end.
A is formed. This second shutter member 120
Indicates that the rotating shaft 122 is the shutter shaft hole 5 of the base plate portion 32.
2, and is disposed between the concave portion 32C of the base plate portion 32 and the upper surface of the lower plate portion 36 with the pressed piece 120B inserted into the shutter guide hole 62. In this state, the sliding 12 of the rotating shaft 122
2A, one end of the torsion spring 124 is locked, and the other end of the torsion spring 124 is locked to the spring holding portion 56 of the base plate portion 32.
Reference numeral 20 is constantly urged in the direction of contact with the first shutter member 110.

Thus, the second shutter member 120
Usually, the abutting portion 120A is in a state of abutting against the abutting portion 112A of the first shutter member 110, and the hub hole 50A of the base plate portion 32 is mainly closed in this state. At this time, the first shutter member 11
0 pressing piece 112B and the pressed piece 120B of the second shutter member 120 are engaged with the front inner edge of the shutter guide hole 62 of the base plate portion 32, respectively.
The striking state of 12A and 120A is maintained.

Next, such a disk cartridge 1
Explaining the operation of No. 0, when the disc medium 20 is not used, the opening 14 is closed by the first shutter member 110 and the second shutter member 120.
That is, as shown in FIG. 4, the abutting portion 112A of the first shutter member 110 and the second shutter member 12
The first shutter member 110 mainly closes the recording / reproducing head window 50B of the base plate portion 32, and the second shutter member 120 is connected to the base plate 120A. Hub hole 50 of part 32
A is mainly closed.

At this time, the first shutter member 110
When the lock claw 106 of the lock lever 100 is engaged with the small hole 118A of the shutter drawer 118, the rotation of the opening 14 in the opening direction is restricted, and the above-described closed state is maintained. On the other hand, the second shutter member 120 is urged by the torsion spring 124 in the direction in which the second shutter member 120 abuts against the first shutter member 110, and maintains the closed state.
This prevents dust from entering the disc cartridge 10 when the disc medium 20 is not used, that is, preventing dust from adhering to the lower surface 24 of the disc medium 20.

When using the disk cartridge 10,
That is, when recording information on the disk medium 20 or reproducing information recorded on the disk medium 20,
It is loaded into the drive device. Disk cartridge 10
Is loaded into the drive device with its front end 10A at the top. Then, with this insertion, the guide projections 202 of the drive device are inserted into the first guide groove 12A and the second guide groove 12B of the disk cartridge 10, respectively.

The guide projection 202 inserted into the first guide groove 12A relatively moves toward the rear of the first guide groove 12A as the disc cartridge 10 is further inserted.
Lock release lever 10 located in first guide groove 12A
4 and is pressed backward. When the lock release lever 104 is pressed backward, the lock lever 100 rotates around the support shaft 102 (the shaft hole 58A), the lock release lever 104 is retracted into the lock release lever hole 92, and the lock pawl 106 The engagement state between the shutter opening 118A and the small hole 118A of the shutter drawer 118 is released. As a result, the locked state of the first shutter member 110 is released, and the first shutter member 110 is released.
The shutter member 110 is rotatable.

When the guide convex portion 202 of the drive device relatively moves rearward in the first guide groove 12A, the guide convex portion 202 maintains the above-mentioned unlocked state and the shutter located in the first guide groove 12A. It engages with the engaging portion 18 and presses it backward. Shutter engaging part 1
8 is pressed rearward, the locked state is released.
The shutter member 110 rotates. That is, with the rearward movement of the shutter engaging portion 18, the shutter leading portion 118 moves rearward in the shutter guide groove extending in the tangential direction of the cylindrical wall 40, and the arc-shaped guide wall portion 114 of the cylindrical wall 40 It rotates while sliding along the outer peripheral surface.

With the rotation of the arc-shaped guide wall portion 114, the shutter body 112 integrated therewith rotates along the cylindrical wall 40, and the pressing piece 112B is moved to the shutter guide hole 62.
Move almost inside. Then, the pressed piece 120 </ b> B of the second shutter member 120, which is in contact with the second guide member 120, moves along the arc-shaped portion of the shutter guide hole 62 while being pressed substantially rearward. With the movement of the pressed piece 120B,
The second shutter member 120 rotates around the rotation shaft 122 in a direction away from the first shutter member 110 against the urging force of the torsion spring 124.

When the guide convex portion 202 of the drive device engages with the shutter engaging portion 18 (while pressing the shutter engaging portion 18 rearward) and moves relatively backward in the first guide groove 12A. , First shutter member 110
(Shutter body 112 and arc-shaped guide wall 114)
And the second shutter member 120 are in contact with each other.
Further rotation is performed in a direction to separate 2A and 120A, and as shown in FIG. 5, the recording / reproducing head window 50B and the hub hole 50A are opened. At this time, since the window 96 is located at the front of the disk cartridge 10, the window 70 of the upper plate 34 is also opened. Thus, the opening 14 of the disk cartridge 10 is opened.

Further, this disk cartridge 10
When the drive device is inserted to a predetermined position, the positioning mechanism of the drive device is inserted into the position regulating hole 16 to accurately position the drive device. As a result, the disc cartridge 10 cannot be inserted any more, and the closing of the opening 14 due to the urging force of the torsion spring 124 and the movement of the disc cartridge 10 in the ejection direction (the insertion port 200 side) are also prevented.

Next, the rotary spindle shaft is inserted from a portion corresponding to the hub hole 50A of the opening 14 from which the closed state has been released. The rotating spindle shaft holds the center core portion 26 of the disk medium 20 at the distal end by engagement, suction, or the like, and rotates the disk medium 20 around its axis. A recording / reproducing head is inserted from a portion of the opening 14 corresponding to the recording / reproducing head window 50B, and records information on the recording surface of the disk medium 20 or reproduces information recorded on the recording surface.

Thereafter, when the disk cartridge 10 is ejected from the drive device, the positioning mechanism is pulled out from the position regulating hole 16 and is ejected in the ejection direction (the insertion opening 200).
Side) can be moved. In this state, the disc cartridge 10 moves with the rear end portion 10B at the head by the urging force of the torsion spring 124 or the pressing force applied by the drive device in the discharge direction. With this movement, while the guide projection 202 of the drive device is engaged with the shutter engagement portion 18, the pressing force via the guide projection 202 does not act, and the first shutter member 110
Is in a rotatable state.

In this state, the disk cartridge 10
Closes the opening 14 while moving in the discharge direction as described above. That is, the second shutter member 120 causes the pressed piece 120B by the urging force of the torsion spring 124.
At the time, the pressing piece 112B of the first shutter member 110 is rotated substantially in the forward direction while pressing the pressing piece 112B substantially forward. The first shutter member 110 pressed substantially forward by the pressing piece 112B rotates in the closing direction of the opening 14 by this pressing.

When the first shutter member 110 and the second shutter member 120 rotate and return to the initial positions, the opening 14 is closed. The pressing piece 112B of the first shutter member 110 that has returned to the initial position is engaged with the inner edge of the front part of the shutter guide hole 62, and the torsion spring 124 of the second shutter member 120 abuts on the pressing piece 112B via the pressed piece 120B. Further rotation by the urging force is prevented.

When the disc cartridge 10 is further moved in the ejection direction and the guide projection 202 is moved forward from the lock release lever hole 92 of the first guide groove 12A, the lock lever 10 is biased by the torsion spring 108.
0 rotates, and the lock release lever 104 moves to the first guide groove 1.
2A, and the lock claw 106 is inserted into the small hole 1 of the shutter drawer 118 of the first shutter member 110.
18A. As a result, the disk cartridge 10 returns to the state before being loaded into the drive device, and the first
The rotation of the shutter member 110 is prevented, and the closed state of the opening 14 is maintained.

Next, the present invention will be described in detail with respect to the disk cartridge 10 as described above. As shown in FIGS. 2 and 3, a substantially rectangular cutout portion 44 </ b> A is formed in the rear wall 44 near the corner of the base plate portion 32, and the rear wall 74 corresponding to that of the upper surface plate portion 34 is also substantially formed. A rectangular cutout 74A is formed. When the case 30 is assembled, the rear wall 44 and the rear wall 74 come into contact with each other, so that the notches 44A and 74A face each other, and as shown in FIG. 6, a substantially rectangular exhaust hole 128 is formed. It has become.
A substantially rectangular notch 40A is also formed in the cylindrical wall 40 near the exhaust hole 128, and the notch 40A has
Filter member 130 large enough to close it
Is provided.

According to such a configuration, the air that has entered through the hub hole 50A, which is the insertion hole of the rotary spindle shaft 126, becomes an entrained airflow and swirls on the recording surface (lower surface 24) of the disk medium 20. The airflow flowing toward the front side of the disk cartridge 10 is exhausted from the recording / reproducing head window 50B, but the airflow flowing toward the rear side of the disk cartridge 10 is The air passes through the filter member 130 provided on the 40A and is exhausted from the exhaust hole 128 to the outside (see FIG. 6).

Therefore, dust and the like contained in the airflow flowing toward the rear side of the disk cartridge 10 are appropriately trapped by the filter member 130.
As a result, clean air containing no dust or the like is exhausted into the drive device. That is, by repeating such air circulation, dust and the like contained in the air in the drive device can be reduced, so that dust and the like contained in the air reentering from the hub hole 50A can be reduced. Thus, it is possible to prevent dust and the like from adhering to the recording surface of the disk medium 20. Therefore, at the time of recording / reproduction, it is possible to reduce the occurrence of errors due to dust and the like.

It should be noted that the disc cartridge 10 always has an exhaust hole 128, and dust and the like contained in the air entering through the exhaust hole 128 are naturally trapped by the filter member 130. The recording surface of the disk medium 20 (the lower surface 2
4) No inconvenience such as overflowing occurs.

[0066]

As described above, according to the present invention, it is possible to prevent dust and the like from adhering to the recording surface of a disk medium, and to reduce the occurrence of errors due to dust and the like during recording and reproduction. .

[Brief description of the drawings]

FIG. 1A is a perspective view of a disk cartridge according to the present invention as viewed obliquely from the upper front. FIG. 1B is a perspective view of the disk cartridge according to the present invention viewed obliquely from the lower front.

FIG. 2 is an exploded perspective view of the disk cartridge according to the present invention as viewed from above.

FIG. 3 is an exploded perspective view of the disk cartridge according to the present invention as viewed from below.

FIG. 4 is a bottom view showing the entire configuration of the disk cartridge according to the present invention in a state where the opening is closed, in which a lower plate is removed and a part is cut away.

FIG. 5 is a view corresponding to FIG. 4, showing an open state of the disk cartridge according to the present invention;

FIG. 6 is a schematic sectional view taken along line EE of FIG. 1 (A), in which a rotating spindle shaft is inserted.

[Explanation of symbols]

 10 Disc Cartridge 14 Opening 20 Disc Media 30 Case 32 Base Plate (Lower Shell) 34 Upper Plate (Upper Shell) 36 Lower Plate (Coating Plate) 38 Flat Plate 128 Exhaust Hole 130 Filter Member

Claims (1)

[Claims] 1. A disk cartridge having a shutter member capable of opening and closing a spindle shaft insertion hole and a head insertion hole formed on at least one surface of a case accommodating a disk-shaped disk medium in a rotatable manner. And a filter member provided inside the exhaust hole.