JPH09259566A - Disk cartridge - Google Patents

Abstract

PROBLEM TO BE SOLVED: To smoothly load a disk cartridge by reducing a sliding resistance of a shutter slider and allowing the shutter slider smoothly slide in shells. SOLUTION: A shutter 24 consists of shutter elements 24a, 24b formed of a metallic plate such as a stainless plate or the like by press working or a synthetic resin mold, etc., and a coupling element 24c coupling one ends of the shutter elements at right angles. The shutter is formed approximately in a U shape. A bow-shaped bend of an arm 29d in a direction of an arrow (b) is absorbed enough within a leeway 237, so that the arm 29d can freely bend like an arch. It is hence prevented that a large load is impressed to the shutter 24 in the middle of opening in a direction of an arrow (a). The shutter 24 can slide light in the (a) direction and is opened smoothly.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to, for example, a high capacity magneto-optical disk system (High Density MO DiskDrive).
The present invention relates to a disc cartridge most suitable to be applied to an HS cartridge or the like which accommodates an HS disc applied to a system), and particularly belongs to the technical field of shells and shutter sliders.

[0002]

2. Description of the Related Art Recently, as a large-capacity magneto-optical disk applied to a large-capacity magneto-optical disk system (so-called HS), an HS disk in which the recording capacity of an MO disk is further increased has been developed. An HS cartridge, which is a large-capacity disk cartridge in which the HS disk is rotatably housed in a shell composed of upper and lower shells injection-molded of synthetic resin, has been announced. Note that H
The S cartridge has the same size as the 3.5-inch floppy disk cartridge.
The diameter of the S disk is about 3.5 inches (85-90 mm)
Is configured.

Then, as shown in FIGS. 24 and 25,
The HS cartridge 1 comprises a shell 4 composed of upper and lower shells 2 and 3 formed of synthetic resin, and inside the front end edges 2b and 3b of the upper and lower shells 2 and 3, a pair of upper and lower head insertion holes (not shown) are provided. A pair of guide grooves 21 and 22 are formed in parallel with the front end edges 2b and 3b at both left and right positions of (a). Then, again, the shutter slider 23 formed of synthetic resin is inserted between the front end edges 2b and 3b of the upper and lower shells 2 and 3, and the pair of guide pieces 23a integrally formed on both ends of the shutter slider 23 in the sliding direction are vertically moved. A pair of guide grooves 21, 2 of the shells 2, 3
The shutter slider 23 is slidably engaged with the inside of the slider 2 and is slidable along the front end edges 2b and 3b. Then, the shutter 24 having a substantially U-shaped cross section formed of a stainless plate or the like is attached to the front edge 2
The shutter 24 is inserted into the upper and lower shells 2 and 3 from the sides b and 3b and fixed to the shutter slider 23 by screwing or dowel welding.
The shutter slider 23 together with the front edge 2b, 3b
By sliding along the upper and lower shells 2, 3
The shutter 24 is configured to open and close a pair of upper and lower head insertion holes and the like formed in the above.

The front end edges 2b of the upper and lower shells 2 and 3,
A shutter spring 29 formed by a torsion coil spring is housed inside the shutter slider 23 on the inner side of the shutter slider 23 between 3b, and a pair of left and right arms 29 extending from the central coil portion 29c of the shutter spring 29 to both sides.
Both ends 29a and 29b, which are the tips of d and 29e, are locked to one end of the shutter slider 23 and the inner side of either one of the upper and lower shells 2 and 3, and the shutter spring 29 causes the shutter slider 23 to move to the closed position. The slide is biased in the b direction.

When the upper and lower shells 2 and 3 and the shutter slider 23 are conventionally molded with synthetic resin,
Generally, the inner surfaces of the upper and lower shells 2 and 3 and the surface of the shutter slider 23 are mirror-finished. Therefore,
The sliding surfaces 232 and 233 of the upper and lower shells 2 and 3 and the shutter slider 23 are configured to slide on mirror surfaces.

[0006]

However, in the conventional structure in which the sliding surfaces 232 and 233 of the upper and lower shells 2 and 3 and the shutter slider 23 slide on the mirror surfaces, the adsorption phenomenon due to the close contact between the mirror surfaces. As a result, a large sliding resistance is generated in the shutter slider 23, so that the shutter 24 cannot be opened and closed smoothly. As a result, when the HS cartridge 1 is loaded into the HS drive, the shutter 24 does not open smoothly, so that the loading cannot be performed smoothly. Further, when the HS cartridge is ejected from the HS drive, the shutter 24 is not opened. H remains open
There is an inconvenience that the S cartridge 1 is easily ejected.

The present invention has been made to solve the above problems, and an object of the present invention is to provide a disk cartridge capable of smoothly sliding a shutter slider in a shell.

[0008]

DISCLOSURE OF THE INVENTION To achieve the above object, a disk cartridge of the present invention has at least one of sliding surfaces of a shutter slider and an upper and lower shells formed into a rough surface.

In the disk cartridge of the present invention configured as described above, since at least one of the sliding surfaces of the shutter slider and the upper and lower shells is formed as a rough surface, the sliding resistance of the shutter slider is reduced and the shutter slider is reduced. Can be smoothly slid in the shell.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments in which the present invention is applied to an HS cartridge will be described below with reference to FIGS. Note that the same structural portions as those in FIG. 24 and FIG. 25 are given the same reference numerals to omit redundant description.

"Explanation of essential parts of the invention" First, FIGS.
The main part of the present invention will be described below. That is, HS
Upper and lower shells 2, 3 constituting the shell 4 of the cartridge 1
Is injection-molded with a synthetic resin such as polycarbonate resin or ABS resin into a shape described later, and the shutter slider 23 is injection-molded with synthetic resin such as polyacetal resin. Then, as shown in FIGS.
The shutter slider 23 is formed in a slender shape along the sliding directions of arrows a and b, and a pair of left and right guide pieces 23a and 23b are integrally formed on the inner side of both ends of the sliding direction of the shutter slider 23 in the direction of arrow d. It is molded. Therefore, the entire shutter slider 23 is formed in a substantially U shape. Then, a pair of the welding dowels 2 are formed at a position deviated toward the opening direction (arrow a direction) side on the outer side surface 23c of the shutter slider 23.
3d is integrally formed, and a projection 23e having a wide width is formed integrally with the outer surface 23c of the shutter 23 at the end portion on the closing direction (arrow b direction) side in the direction orthogonal to the sliding direction. In addition, a pair of left and right guide pieces 23a, 23b
Is a left-right symmetrical shape in the direction of arrow g, which is the thickness direction,
In addition, it is formed into a substantially wedge-shaped claw shape with a tapered tip toward the arrow d direction which is the inner direction.

As shown in FIGS. 1 to 6, a shutter 24 formed by pressing a metal plate such as a stainless plate or a molded product of synthetic resin is a pair of upper and lower shutter pieces 24a and 24b, and these shutter pieces 24a and 24b. It is formed in a substantially U shape by a connecting piece 24c that connects the ends at a right angle. The shutter 24 is inserted vertically above and below the shutter slider 23 in the opening direction (arrow a direction) to form a pair of dowel holes 24d formed in the connecting piece 24c.
Is fitted to a pair of welding dowels 23d of the shutter slider 23, and the connecting piece 24c is fixed to the outer surface 23c of the shutter slider 23 by the welding stop of these welding dowels 23d. At this time, the welding daho 23
Instead of the welding stop by d, the shutter 24 can be screwed to the shutter slider 23 by using a pair of screws.

Then, the shutter slider 23 is pushed into the inside of the front end edges 2b and 3b of the upper and lower shells 2 and 3 while pushing the front end edges 2b and 3b outward while pushing them against the elasticity. The pair of left and right guide pieces 23a and 23b, which are assembled in parallel with each other in the direction, are formed inside the upper and lower shells 2 and 3 on the left and right sides of the pair of upper and lower head insertion holes 16 and 17, respectively.
The upper and lower shutter pieces 24a and 24b of the shutter 24 are slidably engaged in the shutter 2 and are slidably inserted into the shutter slide recesses 25 and 26 formed on the upper and lower outer surfaces of the upper and lower shells 2 and 3, respectively. Then, the shutter slider 23 and the shutter 24 are assembled so as to be slidable in the directions of arrows a and b along the front end edges 2b and 3b of the upper and lower shells 2 and 3. At this time, as shown in FIG. 3, the projections 23e of the shutter slider 23 are aligned with the front end edges 2b and 3b.
Placed outside of.

Then, the front end edges 2b of the upper and lower shells 2 and 3,
3b between the shutter slider 23 opening direction (arrow a
The shutter spring 29 is incorporated in the shutter spring housing space 28 formed inside the (direction) side from the direction of the arrow d. The shutter spring 29 is composed of a torsion coil spring formed of a metal wire material such as stainless steel, and has a pair of arms 29d and 29e extending from the central coil portion 29c to both sides, and these arms 29d and 29e. Both end portions 29a and 29b, which are the tip ends, are bent at right angles in mutually opposite directions in the thickness direction of the shutter slider 23 (direction of arrow g).
As the shutter spring 29, a metal wire material such as stainless steel, a leaf spring material, or the like formed simply in a substantially V shape may be used. And this shutter spring 2
Both ends 29a and 29b of the shutter slider 23 are
Of the upper and lower shells 2, one end in the opening direction (arrow a direction) of
3 is engaged with a spring engaging portion 30 formed on one side, and the shutter spring 29 slides the shutter slider 23 from the open position shown in FIG. 5 to the closed position shown in FIG. 4 in the direction of arrow b. Being energized. The pair of arms 29d and 29e of the shutter spring 29 are substantially V-shaped and open in a wide angle when the shutter is closed as shown in FIG.
When the shutter shown in FIG. 5 is opened, the shutter is almost U-shaped.

Then, the shutter slider 23 side shift
The catcher spring locking structure is structured as shown in FIG. 1 and FIG.
Has been established. That is, opening the shutter slider 23
One guide piece located at the end on the direction (direction of arrow a)
23a is one side surface in the thickness direction (arrow g direction).
On one side, the thickness T of the entire guide piece 23a is T₁₃Almost 1 /
2 depth D₁₁And, in the shutter closing direction (direction of arrow b)
Direction) constant depth D₁₂Notch for spring insertion cut up to
234 are formed. And one of the guide pieces 2
Notch for spring insertion in the thickness direction of 3a (direction of arrow g)
The part opposite to the spring 234 is configured as a spring piece support piece 235.
doing. Then, on the outer side of the spring piece support piece 235,
A spring engaging groove 236 is formed, and a spring insertion notch
An arrow of the end surface 234a on the closing direction side (arrow b direction) of 234
The inclined surface 234b is formed by forming the slope d 234b on the side of the mark d.
One arm of the shutter spring 29 is on the arrow a direction side of b
Formed in the relief allowance 237 to absorb the bending of 29d
I have. In addition, the slope 234b is the shutter slider 2
A base perpendicular to the sliding direction of 3 (arrows a and b)
Line P₁₁With respect to the direction of arrow d, the angle θ₁₁Open to
The reference line P₁₁And slope 234
angle θ with b₁₁Within the range of
ing. By the way, T₁₃= 1.2 mm, T₁₄= 2.4m
m, D₁₁= 1.2 mm, D₁₂= 2.2 mm, θ ₁₁= 5 °
Is formed.

Then, as shown in FIGS. 1 and 7, one arm 29d of the shutter spring 29 is inserted into the spring insertion notch 234 of the shutter slider 23 in a direction parallel to the arrow b, and its end portion is inserted. 29a to the spring locking groove 23
6 and engages one arm 29d between the spring one side support piece 235 of the shutter slider 23 and one of the upper and lower shells 2 and 3, for example, the lower shell 3 from both sides in the thickness direction (arrow g direction). The shutter slider 23 is supported so as to be sandwiched, and the shutter slider 23 is pressed by the one arm 29d of the shutter spring 29 in the arrow b direction which is the closing direction.

In such a shutter spring locking structure, since the spring insertion notch 234 is formed on one side of the guide piece 23a in the thickness direction (direction of arrow g), the side opposite to the spring insertion notch 234 is formed. The thickness T ₁₃ of the spring piece side support piece 235 is sufficiently thickened to about 1.2 mm, so that the rigidity of the spring piece side support piece 235, that is, the rigidity of the entire guide piece 23a can be sufficiently maintained. Therefore, the pair of guide pieces 2
3a and 23b are slidably engaged with the pair of guide grooves 21 and 22 to secure sufficient attachment strength of the shutter slider 23 mounted between the upper and lower shells 2 and 3 to the upper and lower shells 2 and 3. Therefore, the shutter slider 23 and the shutter 24 can move the upper and lower shells 2 and 3 due to external impact or mischief.
It is possible to prevent accidentally dropping from the gap.

Then, one arm 29d of the shutter spring 29 inserted into a spring insertion notch 234 formed on one side of the guide piece 23a in the thickness direction (direction of arrow g),
Since the support piece 235 is sandwiched between the spring piece support piece 235 and the lower shell 3 from both sides in the thickness direction (arrow g direction), one arm 29d can be stably supported, Although it is possible to prevent the one end portion 29a from accidentally falling out of the spring locking groove 236, the wall thickness T _{14 of the} entire guide piece 23a is 2.4 mm.
It can be made thin enough and the upper and lower shells 2, 3
The total thickness T ₁ of the shell 4 constituted by
It was possible to make it very thin to about 0 mm.

The shutter spring 2 is attached to the end surface 234a of the spring insertion notch 234 of the shutter slider 23.
Since the escape allowance 237 of 9 is formed, as shown in FIG.
When the shutter slider 23 is slid to the open position in the direction of the arrow a, the pair of arms 29d and 29e of the shutter spring 29 opens from the state in which the central coil portion 29c is opened in a V-shaped wide angle as shown in FIG. , As shown in FIG. 5, the arm 29d is contracted into a U shape so that one end 29d
It is possible to freely bend in the direction of the arrow b between the a and the central coil portion 29c in a bow shape. That is, as shown by the alternate long and short dash line in FIG. 7, even if one arm 29d is bent in the direction of arrow b with respect to the shutter slider 23 that is slid in the direction of arrow a, the end surface 234a of the arm 29d has an end face 234a. It is possible to prevent the arm 29d from coming into contact with the arm 29d in a limited direction and limiting the amount of bending of the arm 29d, and the bending of the arm 29d in the direction of the arrow b is sufficiently absorbed in the clearance 237. can do.

At this time, when the end face 234a contacts the arm 29d from the direction of the arrow a while the shutter 24 is being opened in the direction of the arrow a, and the amount of bending of the arm 29d in the direction of the arrow b is limited, the shutter is released. A large load acts on the shutter 24, and the slide of the shutter 24 in the direction of the arrow a suddenly becomes heavy, so that the shutter 24 cannot be smoothly opened. However, as described above, the bow-shaped bending of the arm 29d in the direction of the arrow b is sufficiently absorbed in the clearance 237 so that the arm 29d can flex freely in the bow-shaped manner. Since it is possible to prevent a large load from being applied during the opening of the shutter in the direction of arrow a, and the shutter 24 can be lightly slid in the direction of arrow a, the shutter 24 can be smoothly opened. it can. Similarly, the shutter spring 2
Even when the shutter 24 is closed in the direction of arrow b by 9, the shutter spring 29 can apply a stable sliding force in the direction of arrow b to the shutter 24.
Therefore, the opening operation of the shutter 24 in the directions of the arrows a and b can be performed smoothly and stably.

A notch 2 for inserting a spring is provided on one side in the thickness direction of one guide piece 23a of the shutter slider 23.
According to the structure in which 43 is formed and the guide piece 23a is formed stepwise in the length direction (arrow a, b direction) of the shutter slider 23, the shutter slider 23 at the time of injection molding of this shutter slider 23 with synthetic resin is performed. The fluidity of the resin from the center in the length direction of the to the tip of the spring piece side support piece 235, which is the tip of the guide piece 23a, becomes good, and the moldability of the shutter slider 23 can be improved. That is, for example, if a slit is formed in the center of the guide piece 23a in the thickness direction and the guide piece 23a is formed into a bifurcated shape, the center of the shutter slider 23 in the length direction at the time of injection molding with synthetic resin. There is a problem in that the fluidity of the resin from the to the bifurcated tip of the guide piece 23a deteriorates and the moldability of the shutter slider 23 deteriorates (becomes worse).

Next, the sliding structure of the shutter slider 23 between the upper and lower shells 2 and 3 will be described with reference to FIGS.
And as shown in FIG. That is, the pair of left and right guide pieces 23a, 23 of the shutter slider 23
b is guided by the pair of left and right guide grooves 21 and 22, and the shutter slider 23 moves the upper and lower shells 2 and 3.
5 along the front edge 2b, 3b of FIG.
It is configured to slide in the directions of the arrows a and b with respect to the open position shown in FIG.
The sliding surfaces 232 of the upper and lower surfaces 2f and 3f, which are the inner surfaces of the above, and the sliding surface 233 of the shutter slider 23 are slid on each other.

Therefore, these mutual sliding surfaces 232, 23
At least one of 3 is not a mirror surface, but 2 to 100
It is formed on a rough surface of μmR _Z. That is, the upper and lower surfaces 2f and 3f, which are the inner surfaces of the upper and lower shells 2 and 3 formed of synthetic resin, and the surface of the shutter slider 23 are
Usually, it is mirror finished under 1 μm R _max . Therefore, when the upper and lower shells 2 and 3 and the shutter slider 23 are injection-molded with a synthetic resin, the upper and lower surfaces 2f and 3f of the upper and lower shells 2 and 3 and the surfaces of the shutter slider 23 have sliding surfaces 232 and 233 which are mutually sliding. 2 to 100 μmR by at least one of them by “texture” processing (a method of processing a rough surface with fine uneven surfaces)
_{The Z surface} is roughened at the same time.

As the sliding surface 233 on the shutter slider 23 side, both side surfaces 23 in the thickness direction of the shutter slider 23 as shown by hatching in FIGS.
3a, both side surfaces of the pair of guide pieces 23a and 23b in the thickness direction and the upper surface 233b, the inner side surface 233c of the shutter slider 23, the inner side surface 233d of the protrusion 23e, and the like, and the sliding surfaces 232 on the upper and lower shells 2 and 3 side. , These upper and lower surfaces 2
f, 3f and outer side surfaces 18b, 1 of both connecting arms 18, 19
9b and the like, the surfaces are opposed to the surfaces 233a to 233d and are mutually slidable.

Then, in this way, the sliding surfaces 232 and 23
If at least one of 3 and 3 is roughened, the adsorption phenomenon due to the close contact between the mirror surfaces of the synthetic resin does not occur at all, and the sliding resistance of the shutter slider 23 with respect to the upper and lower shells 2 and 3 is greatly reduced. Therefore, the shutter slider 23 can be smoothly slid in the upper and lower shells 2 and 3 in the directions of arrows a and b, and the opening operation of the shutter 24 in the directions of arrows a and b can be smoothly performed. Therefore, the shutter 24 can be smoothly opened in the direction of the arrow a when the HS cartridge 1 is loaded into the HS drive 51, which will be described later.
The loading operation of the HS cartridge 1 can be smoothly performed. In addition, the HS drive 5 of the HS cartridge 1
1 Even when ejecting to the outside, the shutter 24 can be smoothly closed in the direction of the arrow b.
It is possible to prevent the inconvenience that the HS cartridge 1 is ejected with the door open.

[Overall Description of HS Cartridge] Next, the overall HS cartridge 1 will be described with reference to FIGS. First, H which is a disk cartridge
The S cartridge is composed of upper and lower shells 2 and 3 injection-molded with a synthetic resin such as polycarbonate resin or ABS resin.
Has a flat and substantially rectangular shell 4 which is fitted together from above and below and integrally joined by welding or the like, and an HS disk 5 which is a disk-shaped recording medium is rotatably accommodated in the shell 4. The HS disk 5 is a large-capacity magneto-optical disk in which the recording capacity of the MO disk is further increased, and a center hub 6 formed by pressing a metal plate such as a stainless plate is fixed to the center by adhesion or the like. The center hub 6 has a spindle insertion hole 6
a is formed.

On the outer periphery of the lower surface of the ceiling wall 2a of the upper shell 2 and the upper surface of the bottom wall 3a of the lower shell 3, there are three sides of the left and right side edges 3c and the rear edge 3d excluding the front edge 2b, 3b. Rib-shaped outer peripheral wall 2 formed in a substantially U shape along the
e and 3e are integrally formed, respectively, and a pair of upper and lower disc outer peripheral receiving ribs 7 and 8 having a substantially circular ring shape and having the same diameter along the outer periphery of the lower surface of the ceiling wall 2a and the upper surface of the bottom wall 3a.
Are integrally formed. On the lower surface of the ceiling wall 2a and the upper surface of the bottom wall 3a, the disc outer peripheral receiving ribs 7,
8, a plurality of welding dowels 10 and 11 that are opposed to each other from above and below are integrally formed, and the upper and lower shells 2 and 3 are fitted from above and below to form a plurality of welding dowels 9 and 1.
By welding 0 by ultrasonic welding or the like, the upper and lower shells 2 and 3 are integrally combined to form a flat rectangular shell 4
Is assembled. At least one of the ceiling wall 2a and the bottom wall 3a of the upper and lower shells 2 and 3 is provided with a plurality of gap restricting portions such as pins, ribs and bosses for restricting the clearance between the ceiling wall 2a and the bottom wall 3a. It is integrally molded.

By combining the upper and lower shells 2 and 3 from above and below, a pair of upper and lower disk outer peripheral receiving ribs 7 and 8 are superposed from above and below, and a flat and circular disk storage space 13 is formed inside them. Once formed, the HS disk 5 is horizontal in the disk storage space 13,
It is stored freely. An annular ring is formed on the lower surface of the ceiling wall 2a of the upper shell 2 and above the cartridge center P ₁ (the cartridge center P ₁ is the center of the shell 4 in the left-right lateral width direction) which is the center of the disk outer peripheral receiving rib 7. The disk inner peripheral receiving rib 14 is integrally formed in a concentric circular shape, and the circular disk table insertion hole 15 is concentric with the bottom wall 3a of the lower shell 3 on the cartridge center P ₁ which is the central portion of the disk outer peripheral receiving rib 8. The center hub 6 of the HS disc 5 is loosely fitted in the disc table insertion hole 15.

On the ceiling wall 2a and the bottom wall 3a of the upper and lower shells 2 and 3, a pair of upper and lower head insertion holes are formed in an elongated shape from a position near the outer periphery of the disc table insertion hole 15 to these front edges 2b and 3b. 16 and 17 are opened along the cartridge center P ₁ . Then, the front end edges 2b, 3b of the pair of upper and lower head insertion holes 16, 17 are formed.
Side open ends 16a, 17a side of these head insertion holes 1
A pair of upper and lower bridge pieces 18 and 19 which are connected to _each other in the width direction of 6 and 17 (a direction perpendicular to the cartridge center P ₁ ) and which are substantially symmetrical in the vertical direction are the lower surfaces of the ceiling walls of the upper and lower shells 2 and 3. Horizontally integrally molded on the upper surfaces of 2a and the bottom wall 3a. The bridge pieces 18 and 19 are superposed from above and below at the center position in the thickness direction of the shell 4, and the inner side surfaces 18 of the bridge pieces 18 and 19 are overlapped with each other.
Reference characters a and 19a are formed in an arc shape having the same diameter as the inner peripheral surfaces 7a and 8a of the pair of upper and lower disk outer peripheral receiving ribs 7 and 8, and the outer surfaces 18b and 19b are formed at a right angle to the cartridge center P ₁ . Has been done.

The bridge pieces 18, 1 are formed on the lower surface of the ceiling wall 2a and the upper surface of the bottom wall 3a of the upper and lower shells 2, 3, respectively.
A pair of left and right shutter guide grooves 21, 22 are provided at the left and right side positions of 9, respectively.
Is formed at a right angle to the cartridge center P ₁ . The shutter slider 23 formed of a synthetic resin such as polyacetal resin is located outside the pair of upper and lower bridge pieces 18 and 19, and the upper and lower shells 2,
It is assembled at a right angle to the cartridge center P ₁ between the front end edges 2a, 3a of the cartridge 3. A pair of left and right guide pieces 23a and 23b integrally formed inside both ends of the shutter slider 23 in the length direction (left and right direction).
The shutter slider 23 as a whole is formed in a substantially U-shape, and the pair of left and right guide pieces 23a,
A pair of upper and lower shells 2 and 3 are slidably engaged between a pair of left and right shutter guide grooves 21 and 22. Therefore, the shutter slider 23 is guided by the shutter guide grooves 21 and 22, and the upper and lower shells 2,
Within the front end edges 2a and 3a of the cartridge 3, it is slidable in the directions of arrows a and b which are directions perpendicular to the cartridge center P ₁ .

The shutter 24, which is pressed by a metal plate such as a stainless plate, is formed in a substantially U shape by a pair of upper and lower shutter pieces 24a and 24b and a connecting piece 24c that connects one ends of these at a right angle. ing. The shutter 24 is fixed to the outside of the end of the shutter slider 23 on the closing direction side by a connecting piece 24c by welding with a welding dowel, screwing or the like, and a pair of upper and lower shutter pieces 24 of the shutter 24.
a and 24b are slidably stacked on the upper surface of the ceiling wall 2a and the lower surface of the bottom wall 3a of the upper and lower shells 2 and 3, respectively. At this time, the upper shutter piece 24a is formed as a small piece that can close only the upper head insertion hole 16, and the lower shutter piece 24b simultaneously closes the lower head insertion hole 17 and the disk table insertion hole 16. It is formed into a large piece that can be formed. The pair of upper and lower shutter pieces 24a and 24b are used for shutter slides formed on the upper surface of the ceiling wall 2a and the bottom surface of the bottom wall 3a of the upper and lower shells 2 and 3 and having a thickness substantially equivalent to those of the shutter pieces 24a and 24b. It is configured to slide in the recesses 25 and 26 in the directions of arrows a and b. It should be noted that the lower shutter piece 24b formed on the large piece has a tip (an end on the side opposite to the connecting piece 24 side) made of a stainless steel plate or the like fixed to the end inside the lower recess 26 by adhesion or the like. It is slidably inserted inside the shutter guide piece 27.

Therefore, the shutter 24 is integrated with the shutter slider 23, and the front end edges 2b of the upper and lower shells 2 and 3,
3A and 3B, the position of the lid shown in FIG. 17 (the position where the pair of upper and lower shutter pieces 24a and 24b simultaneously closes the disc table insertion hole 15 and the pair of upper and lower head insertion holes 16 and 17) and FIG. Open position (a pair of upper and lower shutter pieces 24a, 24b is the disk table insertion hole 1
5 and the pair of upper and lower head insertion holes 16 and 17 are displaced to one side, and the arrow between the disk table insertion hole 15 and the position where the pair of upper and lower head insertion holes 16 and 17 are simultaneously opened). It is configured to be slidable in the a and b directions.

The front end edges 2a of the upper and lower shells 2 and 3,
A shutter spring 29 is housed in a substantially triangular shutter spring housing space 28 surrounded by outer peripheral ribs 2e and 3e and disk outer peripheral receiving ribs 7 and 8 inside one side of 3a. The shutter spring 29 is formed in a substantially V shape by a torsion coil spring, and both ends 29a and 29b of the shutter spring 29 are connected to the guide piece 23a on one end side of the shutter slider 23, the upper and lower shells 2,
3 is locked to a spring locking portion 30 integrally formed on either the lower surface of the ceiling wall 2a or the upper surface of the bottom wall 3a.
The shutter spring 29 slides the shutter slider 23 integrally with the shutter slider 23 in the direction of arrow b to the closed position.

The bottom wall 3a of the lower shell 3 is connected to the rear edge 3
A pair of right and left positioning holes 31 are formed at positions offset to the d side, and a write protector 32 for preventing erroneous erasure is provided inside one side of the rear end edges 2a, 3d of the upper and lower shells 2, 3.
Is attached slidably in the directions of arrows a and b. The light protector 32 is the upper and lower shells 2, 3
Of the upper and lower shells 2 and 3 are slidably fitted in protector guide ribs 33 integrally formed on either the lower surface of the ceiling wall 2a or the upper surface of the bottom wall 3a.
a and bottom wall 3a are formed with detection holes 34 and 35 for preventing erroneous erasure that are opened and closed by the light protector 32, and the sliding operation of the light protector 32 on the rear end edges 2d and 3d of the upper and lower shells 2 and 3. A hole 36 is formed. A recess 37 is formed at the front end edges 2b and 3b of the upper and lower shells 2 and 3b on the side opposite to the slide space of the shutter 24 so that the projection 23e of the shutter slider 23 slides at a right angle to the cartridge center P ₁ . A shutter opening / closing pin call-in recess 38 is formed between the recess 37 and the projection 23e of the shutter slider 23 which is returned to the closed position shown in FIG. On the shutter 24 side of the recess 37, a shutter opening / closing pin lock recess 39 is formed.

In addition to the basic structure described above, the HS cartridge 1 has a structure for preventing erroneous insertion into the HS drive and a structure for automatic loading into the HS drive. That is, on the front edge 2b, 3b side which is the insertion direction side of the upper and lower shells 2, 3 into the HS drive,
A pair of left and right erroneous erasure determination notches formed by cutting the left and right side edges 2c, 3c in a groove parallel to the cartridge center P ₁ to a depth reaching from the bottom surface of the lower shell 3 to a part of the lower surface of the upper shell 2. 40 is formed. Then, on the front end edge 2b side of the left and right side edges 2c of the upper shell 2, a portion that covers the upper part of the pair of left and right erroneous erasure determination notches 40 is formed in the pair of left and right wing portions 41. Is formed to be slightly thinner than the total thickness of the upper shell 2.

Then, the pair of left and right erroneous insertion determination notches 40 in the lower shell 3 are arranged in the length direction (cartridge center P ₁
A pair of left and right cartridge retracting recesses 42 that are notched in a substantially semicircular shape are formed in the middle of the direction (along the direction). The depth of the pair of left and right cartridge retracting recesses 42 (in the thickness direction of the upper and lower shells 2 and 3) is the same as the depth of the pair of left and right erroneous insertion determination notches 40. Inside the pair of left and right wing portions 41, a part of the ceiling wall 2a is formed in a pair of left and right lid portions 43 that cover the upper portions of the pair of left and right cartridge retracting recesses 42.

[Explanation of dimensions of HS cartridge] Next,
The dimensions of each part of the HS cartridge 1 configured as above will be described. First, the diameter of the HS disk is about 3.5 inches, which is 85 to 90 mm.
It is configured to be 8 mm. And the HS cartridge 1
The overall outer dimensions are substantially the same as those of the 3.5-inch floppy disk cartridge, and the width W _{1 in} the left-right direction, the depth D _{1 in the} front-rear direction, and the thickness T ₁ in the up-down direction of the entire shell 4 are W ₁ = 92 mm and D ₁ = 9 respectively
7 mm and T ₁ = 5 mm. The thicknesses T ₂ and T ₃ of the upper and lower shells ₂ and ₃ are each set to 2.5 mm. And the inner diameter D of the disc insertion hole 15
₂ is configured to be 19.5 mm, the width W _{2 in} the left-right direction and the depth D _{3 in the} front-rear direction of the upper head insertion hole 16 are configured to be W ₂ = 16 mm and D ₃ = 38 mm, respectively. The width W _{3 in the} left-right direction and the depth D _{4 in the} front-rear direction are W ₃ = 19.5 mm and D ₄ = 38 mm, respectively. The width W _{4 in} the left-right direction, the depth T ₄ in the up-down direction, and the length L ₁ in the front-back direction of the pair of left and right erroneous erasure determination notches 40 are W ₂ = 2.5 mm and T ₄ , respectively.
= 3.0 mm, L ₁ = 38.5 mm,
Vertical thickness T _{5 of the} pair of left and right wings 41 of the upper shell 2
Is configured to be 2.0 mm. Then, the front-rear direction of the width W ₅ and the left-right direction of the depth D ₅ each W ₅ = 4.3 mm of the pair of left and right cartridge retracting recesses 42, D ₅
= 3.0 mm, and the vertical depth is 3.0 mm, which is the same as the vertical depth T _{4 of the} pair of left and right erroneous erasure determination notches 40.

[Description of HS Drive] Next, referring to FIGS. 19 to 23, the HS which is a disk drive for recording (writing) and reproducing (reading) information on the HS disk 5 will be described.
The drive 51 will be described. This HS drive 51
The front panel 52 is provided with a horizontally and horizontally long cartridge insertion opening 53 having an inward opening / closing lid 53. Inside the HS drive 51, a cartridge holder 55 is horizontally provided at the back of the cartridge insertion opening 53. It is located in. And this cartridge holder 5
5, a pair of left and right horizontal cartridge insertion guides 55b, which have a substantially U-shaped cross section and are symmetrically formed so as to face each other, are integrally formed on the lower portions of the left and right edges of the horizontal ceiling plate 55a. Is formed in. A pair of left and right erroneous insertion preventing claws 56 are integrally formed inside the center portion of the pair of left and right cartridge insertion guides 55b in the front-rear direction (arrows c and d directions).

Then, one end of a horizontal shutter opening / closing lever 58 is attached to a vertical fulcrum pin 57 attached to the upper portion of the ceiling plate 55a of the cartridge holder 55, and one end of the horizontal shutter opening / closing lever 58 is passed through the long hole 59 in the front-back direction (arrow c, d direction) and left and right. The vertical shutter opening / closing pin 60 attached to the lower part of the other end of the shutter opening / closing lever 58 is mounted so as to be rotatable and slidable in the directions (arrows a and b directions).
It is vertically inserted into the cartridge holder 55 through the guide groove 61 formed in a. The shutter opening / closing lever 58 is urged to move from the shutter open position shown in FIG. 21 to the shutter open position shown by the alternate long and short dash line in FIG. 20 by an eject spring 62 formed of a tension coil spring. A slotted head insertion notch 63 is formed along the cartridge center P ₁ from the central portion to the rear end of the ceiling plate 55a, and the ceiling plate 55a has a plurality of cartridge pressing springs composed of leaf springs. 64 is attached. A holder elevating mechanism (not shown) that vertically elevates and lowers the cartridge holder 55 in the HS drive 51 by parallel movement.
Is incorporated.

Inside the HS drive 51, at the lower position of the cartridge holder 55, on the cartridge center P ₁ and at the position deviated to the front panel 52 side, the vertical spindle 6 of the spindle motor 65 is provided.
6 and a disk table 67 integrally fixed to the rotor housing which is horizontally fixed to the outer periphery of the position near the upper end thereof. The objective lens 69 of the optical pickup 68 is attached to the upper portion of the carriage 70 inside the HS drive 51 at a position rearward (in the direction of arrow c) of the spindle motor 65 at the lower position of the cartridge holder 55. It is located on the center P ₁ . The carriage 70 includes a pair of left and right guide shafts 71, a pair of left and right voice coils 72, and a pair of left and right magnetic circuits 7 each including a pair of yokes and magnets.
A pair of left and right linear motors 74 composed of 3 and 3 are configured to seek in the directions of arrows c and d.

The optical block 75 of the optical pickup 68 is located behind the carriage 70 (on the side of arrow c).
The laser diode 76 and the collimator lens 7 are arranged in the optical block 75.
7, a beam splitter 78, a multi-lens 79, a reading phototransistor 80, a monitor phototransistor 81, and the like are incorporated. On the cartridge center P ₁ , a galvanometer mirror 82 is arranged on one side of the optical block 75, and the objective lens is inside the horizontal light transmission hole 83 formed on the cartridge center P ₁ of the carriage 70. A raising mirror 84 is incorporated in a position directly below 69. Then, the suspension 85 is provided on the rear end of the carriage 70 (the end on the arrow c direction side).
A magnetic field modulation head 86, which is a flying head attached via the above, is arranged at a position directly above the objective lens 69 on the cartridge center P ₁ with a space. A head elevating mechanism (not shown) for vertically elevating the magnetic field modulation head 86 in synchronization with the elevating operation of the cartridge holder 55 is incorporated in the HS drive 51.

The HS drive 51 is constructed as described above, and when the HS cartridge 1 is loaded, the upper shell 2 and the lower shell 3 are oriented in a correct horizontal posture with the upper shell 2 facing upward and the lower shell 3 facing downward. Front edge 2
It is horizontally inserted from the a, 3a side into the cartridge insertion port 54 in the direction of arrow c. And this HS cartridge 1
While pushing the open / close lid 53 inward by this HS
The cartridge 1 is attached to the ceiling plate 5 of the cartridge holder 55.
A pair of left and right cartridge insertion guides 55b at the bottom of 5a
Insert it horizontally from the direction of arrow a. Then, as shown in FIGS. 20 and 21, by inserting the HS cartridge 1 into the cartridge holder 55 in the direction of arrow c,
Right and left pair of notches 4 for erroneous insertion determination of the HS cartridge 1
0 is correctly inserted into the pair of left and right erroneous insertion preventing claws 56 in the cartridge holder 55 from the direction of arrow c. That is, at this time, the HS cartridge 1 is correctly inserted into the cartridge holder 55, and the pair of left and right erroneous insertion preventing claws 56 are inserted into the pair of left and right erroneous insertion determination notches 40 of the HS cartridge 1. The HS cartridge 1 can be smoothly inserted into the cartridge holder 55 by being relatively correctly inserted from the d direction.

With the insertion of the HS cartridge 1 into the cartridge holder 55 in the direction of arrow c, first, the shutter opening / closing pin 60 which has been returned to the position indicated by the alternate long and short dash line in FIG. After being called into the shutter opening / closing pin calling concave portion 38 of the HS cartridge 1 shown in FIG. 17, the concave portion 37 pushes in the arrow c direction. Then, as shown by the solid line in FIG. 20, the shutter opening / closing pin 60 is moved in the direction of the arrow a along the recess 37 while being guided by the guide groove 61, and the shutter opening / closing lever 58 is moved by the eject spring 62. The shutter opening / closing pin 60 rotates the shutter slider 2 in the direction of arrow e.
The protrusion 23e of No. 3 is pushed in the direction of arrow a. The shutter 24 is integrated with the shutter slider 23 as shown in FIG.
18 from the closed position shown in FIG. 18 to the open position shown in FIG. 18 against the shutter spring 29 so that the disc table insertion hole 15 and the pair of upper and lower head insertion holes 16 and 17 of the HS cartridge 1 are opened at the same time. To be done.

When the shutter 24 reaches the open position, the shutter opening / closing pin 60 enters the shutter opening / closing pin locking recess 39 shown in FIG. 17 and is locked at that position, and the HS cartridge 1 continues to be a cartridge. It is inserted in the holder 55 in the direction of arrow c. When the HS cartridge 1 reaches the insertion completion position shown in FIG. 21, the HS cartridge 1 is moved by the cartridge stopper (not shown) in the cartridge holder 55.
Is stopped in the cartridge holder 55. Note that H
Shutter opening / closing pin lock recess 3 of the S cartridge 1
The shutter opening / closing pin 60 locked in 9 then linearly moves in the direction of arrow c along the guide groove 61.

Then, almost simultaneously with the completion of the insertion of the HS cartridge 1 into the cartridge holder 55, the cartridge holder 55 is lowered by the parallel movement. Then, the HS cartridge 1 is horizontally mounted from above on a plurality of cartridge positioning pins (not shown) in the HS drive 51, and two of the positioning pins are HS
The HS cartridge 1 is fitted into the pair of right and left positioning holes 31 of the cartridge 1, and the HS cartridge 1 is pressed and positioned on the plurality of cartridge positioning pins by the plurality of cartridge pressing springs 64 of the cartridge holder 55. Then, the loading of the HS cartridge 1 into the HS drive 51 is completed as described above.

On the other hand, the spindle motor 65 is already rotationally driven by turning on the power supply to the HS drive 51 before the loading is started. And the HS cartridge 1
Upon completion of the loading, the spindle 66 and the disc table 67 are relatively inserted from below into the disc table insertion hole 15 of the HS cartridge 1,
The upper end of the spindle 66 is inserted into the spindle insertion hole 6a of the center hub 6 of the disc 5, and the center hub 6 is fitted into the disc table 67 and magnetically chucked. Are floated up and down in the shell 4 at intermediate positions.

At the same time, the objective lens 69 of the optical pickup 68 is relatively inserted into the lower head insertion hole 17 of the HS cartridge 1 from below, and the objective lens 69 approaches the lower surface of the HS disk 5. At the same time, the magnetic field modulation head 86 is inserted from above into the upper head insertion hole 16 of the HS cartridge 1 through the head insertion notch 63 of the cartridge holder 55, and the magnetic field modulation head 86 is placed on the upper surface of the HS disk 5. It is levitated by an air film.

After that, the HS disk 5 is rotationally driven at a high speed in the HS cartridge 1 by the spindle motor 65, and the carriage 70 of the optical pickup 68 is sought in the arrow c and d directions by the pair of left and right linear motors 74. Then, the objective lens 69 and the magnetic field modulation head 86 are integrally sought in the directions of arrows c and d along the cartridge center P ₁ . Then, while modulating the magnetic field of the HS disk 5 by the magnetic field modulation head 86, the laser beam LB emitted from the optical block 75 of the optical pickup 68 is irradiated onto the HS disk 5 from below through the objective lens 69, and the HS disk 5 is irradiated. Records and plays back information.

At this time, the laser beam LB emitted from the laser diode 76 of the optical block 75 is radiated horizontally to the galvano mirror 82 outside the optical block 75 through the collimator lens 77 and the beam splitter 78, and the laser beam LB is galvano mirror 82. Then, it is bent at 90 ° in the horizontal direction to irradiate the rising mirror 84 in the light transmission hole 83 of the carriage 70. Then, the laser beam LB is bent vertically by 90 ° by the rising mirror 84 to irradiate the objective lens 69 from below, and the objective lens 69 irradiates the laser beam LB to the HS disk 5 vertically from below. Then, the laser beam LB reflected by the HS disk 5 is passed through the objective lens 69, the rising mirror 84, and the galvano mirror 82 to the optical block 7
The beam is returned to the beam splitter 78 of No. 5 and is received (received) by the reading phototransistor 80 and the monitor phototransistor 81 through the multi-lens 79.
Information is recorded on and reproduced from the HS disc 5.

It should be noted that H after recording and reproducing of the HS disk 5
The eject operation of the S cartridge 1 is performed by the reverse operation of the loading operation described above. That is, first, the cartridge holder 55 is lifted by the parallel movement in the HS drive 51, and the HS disk 5 is lifted together with the HS cartridge 1, so that the HS disk 5 is separated upward from the spindle 65 and the disk table 67. At about the same time, the magnetic field modulation head 86 is released above the head insertion notch 63 of the cartridge holder 55. Then, almost simultaneously with the completion of the raising of the cartridge holder 55, the shutter opening / closing lever 58 is moved in the directions of the arrows d and f by the eject spring 62, and the shutter opening / closing pin 60 is moved along the guide grooves 61 by the arrows d and f.
The shutter opening / closing pin 60 moves the HS cartridge 1 to the outside of the cartridge insertion opening 54 of the HS drive 51 in the arrow d direction. Then, during that time, the shutter 24 of the HS cartridge 1 is slid by the shutter spring 29 to the closed position in the arrow b direction.

By the way, when the HS cartridge 1 is inserted into the cartridge insertion opening 54 of the HS drive 51 from the direction of the arrow c, if the HS cartridge 1 is erroneously inserted in the front / rear direction or the vertical direction, the cartridge is The pair of right and left erroneous insertion preventing claws 56 in the holder 55 prohibits the HS cartridge 1 from being inserted. The vertical thickness T ₄ of the pair of left and right erroneous insertion determination notches 40 of the HS cartridge 1 is set to 3.0 mm, and a pair of left and right erroneous insertion determination notches 40 that cover the upper portion of the pair of left and right erroneous insertion determination notches 40 are formed. The thickness T ₅ of the wing portion 41 in the vertical direction is set to 2.0 mm, which is similar to the HS cartridge 1, but
However, erroneous insertion of a 3.5-inch floppy disk cartridge having a thickness of 3.0 mm can be similarly prohibited by the pair of right and left erroneous insertion prevention claws 56.

By the way, when the HS cartridge 1 is inserted into the cartridge insertion opening 54 of the HS drive 51 from the direction of the arrow c, if the HS cartridge 1 is erroneously inserted in the front-rear direction or the vertical direction, the cartridge is inserted. The pair of right and left erroneous insertion preventing claws 56 in the holder 55 prohibits the HS cartridge 1 from being inserted. The vertical thickness T ₄ of the pair of left and right erroneous insertion determination notches 40 of the HS cartridge 1 is set to 3.0 mm, and a pair of left and right erroneous insertion determination notches 40 that cover the upper portion of the pair of left and right erroneous insertion determination notches 40 are formed. The thickness T ₅ of the wing portion 41 in the vertical direction is set to 2.0 mm, which is similar to the HS cartridge 1, but
However, erroneous insertion of a 3.5-inch floppy disk cartridge having a thickness of 3.0 mm can be similarly prohibited by the pair of right and left erroneous insertion prevention claws 56.

In the auto-loading type HS drive, as shown by the alternate long and short dash line in FIG. 21, inside the pair of left and right cartridge insertion guides 55b of the cartridge holder 55, the rear side of the pair of left and right erroneous insertion prevention claws 56 is prevented. A pair of left and right cartridge retracting means 87 are disposed on the side (direction of arrow c), and when the HS cartridge 1 is inserted into the cartridge holder 55 in the correct posture from the direction of arrow c to a certain depth, the pair of left and right cartridges. The retracting means 87 is engaged in the pair of right and left cartridge retracting recesses 42 of the HS cartridge 1, and the HS cartridge 1 is automatically moved by the cartridge retracting means 87 in the cartridge holder 55 to the position shown in FIG. Of the HS cartridge 1 It is configured to perform the door loading operation.

Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and various modifications can be made based on the technical idea of the present invention. For example, the disc-shaped recording medium of the present invention is not limited to the HS disc, but can be applied to various disc-shaped recording media such as MO discs, MD discs, CDs, CD-ROMs, and floppy discs.

[0055]

The disk cartridge of the present invention constructed as described above has the following effects.

According to a first aspect of the present invention, at least one of the sliding surfaces of the shutter slider and the upper and lower shells is formed as a rough surface to reduce the sliding resistance of the shutter slider, and the shutter slider can be slid smoothly in the shell. Since the shutter can be smoothly opened when the disc cartridge is loaded into the disc drive, the loading operation of the disc cartridge can be smoothly performed. Moreover, even when the disc cartridge is ejected to the outside of the disc drive, the shutter can be closed smoothly, and it is possible to prevent the disc cartridge from being ejected while the shutter is open.

According to a second aspect of the present invention, the rough surface formed on the sliding surface of at least one of the shutter slider and the upper and lower shells is 2 to 2.
Since it is configured to be 100 μm R _Z , the shutter slider can be slid extremely smoothly in the shell.

According to a third aspect of the present invention, when the upper and lower shells and the shutter slider are molded with synthetic resin, the sliding surfaces of these are roughened. Since the surface can be formed to be rough, it can be easily processed and can be manufactured at low cost.

[Brief description of drawings]

FIG. 1 is a cross-sectional side view illustrating a main part of the invention in an embodiment in which the invention is applied to an HS cartridge,
It is an expanded sectional side view in the AA arrow line of FIG.

2 is an enlarged sectional side view taken along the line BB of FIG.

FIG. 3 is an enlarged sectional side view taken along the line CC of FIG.

FIG. 4 is a partially cutaway plan view of an essential part for explaining the return of the shutter slider to the closed position by the shutter spring.

FIG. 5 is a partially cutaway plan view of a main part for explaining movement of a shutter slider to an open position by a shutter spring.

FIG. 6 is a front view of FIG. 4;

FIG. 7 is a perspective view of a main part for explaining a shutter spring engagement structure of the shutter slider.

FIG. 8 is a perspective view of a shutter slider.

FIG. 9 is a perspective view of a shutter slider.

10A and 10B are a front view, a plan view, and left and right side views illustrating a sliding surface of a shutter slider with respect to upper and lower shells.

FIG. 11 is a bottom view and a rear view illustrating a sliding surface of the shutter slider with respect to the upper and lower shells.

FIG. 12 is a bottom view of the upper shell of the HS cartridge.

FIG. 13 is a plan view of the lower shell of the HS cartridge.

FIG. 14 is a perspective view of the upper surface of the entire HS cartridge.

FIG. 15 is a bottom perspective view of the entire HS cartridge.

16A and 16B are a plan view and a bottom view showing the shutter closed state of the HS cartridge.

FIG. 17 is a plan view and a bottom view showing an open state of the shutter of the HS cartridge.

FIG. 18 is an exploded perspective view of the entire HS cartridge.

FIG. 19 is a perspective view showing an HS cartridge and an HS drive.

FIG. 20 is a plan view illustrating the disclosure of the operation of inserting the HS cartridge into the cartridge holder in the HS drive.

FIG. 21 is a plan view illustrating the end of the inserting operation of the HS cartridge into the cartridge holder.

FIG. 22 is a partially cutaway plan view illustrating an optical pickup and a magnetic field modulation head in the HS drive.

23 is a sectional side view of FIG. 22.

FIG. 24 is a cross-sectional side view illustrating a main part of a conventional HS cartridge.

FIG. 25 is a perspective view illustrating a spring engagement structure of a conventional shutter slider.

[Explanation of symbols]

1 is an HS cartridge (disk cartridge), 2 is an upper shell, 2b is a front edge of the upper shell, 2f is a lower surface (inner surface) of the upper shell, 3 is a lower shell, 3b is a front edge of the lower shell, and 3f is a lower shell. The upper surface (inner surface), 4 is a shell, 5 is an HS disk (disk-shaped recording medium), 23 is a shutter slider, 232 is a sliding surface of the upper and lower shells against the shutter slider, and 233 is a sliding surface of the shutter slider against the upper and lower shells. .

Claims (3)

[Claims] 1. A shell consisting of upper and lower shells in which a disk-shaped recording medium is rotatably housed, and a pair of guide pieces inserted between the front end edges of the upper and lower shells, the pair of guide pieces at both ends in the sliding direction of the upper and lower shells A shutter slider that is engaged with a pair of inner guide grooves and slides along the front edge, and at least formed on the shell by being fixed to the shutter slider and sliding integrally with the shutter slider. A disk cartridge comprising a shutter for opening and closing a head insertion hole, wherein at least one of sliding surfaces of the shutter slider and the upper and lower shells is formed into a rough surface. 2. The disk cartridge according to claim 1, wherein the rough surface has a thickness of 2 to 100 μm R _Z. 3. The upper and lower shells and the shutter slider are molded from a synthetic resin, and the sliding surface is roughened when the upper and lower shells and the shutter slider are molded from a synthetic resin. 1. The disk cartridge described in 1.