JPH0514988B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a disk cartridge, and more particularly to a cartridge case that rotatably houses a disk.

[Conventional technology]

Figures 8 and 9 are conventional
8 is a perspective view of the magnetic disk cartridge, and FIG. 9 is an exploded perspective view of a case body used in the magnetic disk cartridge.

In the case of this magnetic disk cartridge, as shown in FIG.
It is composed of a thin intermediate plate 6 having a circular disk storage hole 5 in the center, a lower plate 9 having a wide recess 7 into which a magnetic head is inserted, and a drive hole 8.

By overlapping, the recessed notch 2 and the recessed notch 7 match in position in the vertical direction, and most of the disk storage holes 5 are located between the upper surface plate 4 and the lower surface plate 9.
As shown in FIG. 8, a magnetic disk 10 is rotatably housed in the space defined by these. This magnetic disk 10 is made of a flexible thin magnetic sheet, and has a hub 1 in the center.
0 is fixed, and this hub 10 is inserted into the drive holes 3 and 8, respectively. The connecting portion 11 of the intermediate plate 6 is exposed at the recessed portions 2 and 7 of the upper and lower plates 4 and 9, and the surface of the connecting portion 11 is just one level lower than the surface of the upper and lower plates 4 and 9. It's summery.

Note that the periphery of the magnetic disk 10 is located inside this connecting portion 11, as shown in FIG.

In the case of this magnetic disk cartridge, the surface of the connecting portion 11 is one step lower than the surfaces of the upper and lower plates 4 and 9, and has a recessed shape, so even if the magnetic head becomes large, the magnetic disk Although it has the advantage of having a sufficient radial stroke of the magnetic disk 10 and being able to reliably write and read information up to the outermost tracks of the magnetic disk 10, it is not without its drawbacks.

[Problem to be solved by the invention]

That is, the upper plate 4 has protrusions 12, 12 formed on both sides of the concave cutout 2, and the lower plate 9 also has protrusions 12, 12 formed on both sides of the lower plate 9 with the concave cutout 7 in between. 13, 13 are formed. These protrusions 12, 12 and protrusions 13, 13 are not connected to each other and are independent free ends.

Further, the upper plates 4 and 9 are made of thin plate-like materials as disk cartridges become thinner. Therefore, the above projections 12, 12, 1
The tip portions 3 and 13 often curve outward, that is, in the vertical direction in FIG.

On the other hand, in recent years, in order to prevent dirt from entering the case body 1 through the recessed parts 2 and 7,
There is a tendency for the shutter to be installed on the outside of the This shutter has a U-shaped side surface, and is installed with the shutter straddling the case body 1 from the outside.

When the shutter is externally attached to the disk cartridge shown in Figs. 8 and 9, the protrusion 1
If the tips of the shutters 2 and 13 are bent outward, the shutter will not open and close smoothly, resulting in poor operability.

Furthermore, if the tips of the protrusions 12 and 13 are curved outward, the protrusions 12 and 13 will partially come into pressure contact with the shutter as the shutter opens and closes. Therefore, as the shutter is repeatedly opened and closed, the case body 1 is scraped and abrasion powder is generated, which adheres to the recording disk and head. This wear of the case body 1 is noticeable when a metal shutter is used.

The generation of such abrasion powder is caused by the writing of information,
Or it may cause an error during reading.

The purpose of the present invention is to eliminate these drawbacks, to ensure that information is written and read to the outermost circumference of the recording disk, and that the opening and closing operations of the shutter are smooth, effectively preventing the generation of abrasion powder. Our objective is to provide a disk cartridge that allows for

[Means to solve the problem]

In order to achieve the above-mentioned object, the present invention provides a cartridge case in which case halves of an upper case or a lower case are stacked on top of each other, and the cartridge case is rotatably stored in the cartridge case. In a disk cartridge equipped with a recording disk and a shutter for opening and closing a head insertion port of the cartridge case, the head insertion port of the case half and the edge of the case closest to the edge of the head insertion port are connected to each other. A connecting recess that is lower than the case surface on which the shutter slides is provided in between, and both sides of the head insertion opening of the case half are integrally connected by this connecting recess.

〔Example〕

Next, embodiments of the present invention will be described with reference to the drawings. Figure 1 is a perspective view of the disk cartridge with the shutter removed, Figure 2 is a perspective view of the disk cartridge when it is not in use, Figure 3 is a perspective view of the disk cartridge when it is in use, and Figure 4 is a perspective view of the disk cartridge when it is not in use. FIG. 5 is an enlarged sectional view of the main part of the disk cartridge, and FIG. 5 is a perspective view of the shutter.

The disk cartridge includes a cartridge case 21, a magnetic disk 22 rotatably housed therein, and a cleaning member 23 disposed between the cartridge case 21 and the magnetic disk 22.
(see FIG. 4) and a shutter 24.

The cartridge case 21 is composed of an upper case 25 and a lower case 26 made of a molded body of hard synthetic resin.Both cases 25 and 26 have a drive hole 27 in the center as shown in FIG. A long hole-shaped magnetic head insertion opening 28 is provided on the outside. Slightly recessed shutter slide portions 29 are formed on the left and right sides of the magnetic head insertion opening 28, and further between the magnetic head insertion opening 28 and the edge of the case closest to it, that is, in the cartridge insertion direction of the magnetic head insertion opening 28. A connecting recess 30 is provided on the upstream side and is one step lower than the other surfaces of the shutter slide portion 29. When the upper and lower cases 25 and 26 are overlapped, the magnetic head insertion openings 28 of each case match in position, and the connecting recesses 30 overlap to form a thin part 31 that is thin in the thickness direction of the cartridge case 21. , a gap 32 is formed inside thereof as shown in FIG.

As shown in FIG. 4, a sheet-like cleaning member 23 made of nonwoven fabric or the like is adhered to the inside of the upper and lower cases 25 and 26. As shown in FIG. A flexible magnetic disk 22 is rotatably housed inside the cleaning member 23.
A hub 33 is fixed to the center of the drive hole 27, and the hub 33 is inserted into the drive hole 27 as shown in FIG.

As shown in FIG. 4, the magnetic disk 22 is composed of a base film 41 made of a synthetic resin film and magnetic layers 42 coated on both sides thereof.

The shutter 24 is made of a thin metal plate, and as shown in FIG. 5, it consists of an upper plate part 35, a lower plate part 36, and a side part 37 connecting these parts.
The side shape is U-shaped. An opening 34 having approximately the same width as the magnetic head insertion opening 28 is located at the top;
A closing portion 40 is provided on each of the lower plate portions 35 and 36, and adjacent thereto, a closing portion 40 for closing the magnetic head insertion port 28 is formed.

This shutter 24 is a cartridge case 2
A spring member (not shown) attached to the second
As shown in the figure, it is always elastically biased in the closing direction.

Cutout portions 38 having the same width as the opening 34 are provided on the upper and lower sides of the side surface portion 37 at positions corresponding to the opening 34, thereby forming a narrow portion 39 having a narrow vertical width. The width of the narrow portion 39 is approximately equal to the width of the thin portion 31.

When the disk cartridge is not in use, the magnetic head insertion opening 28 and the connecting recess 30 of the cartridge case 21 are closed by the closing part 40 and side part 37 of the shutter 24, as shown in FIG. Intrusion is prevented, and the narrow portion 39 faces the end face of the case at a position offset from the thin portion 31.

When a disk cartridge is inserted into a recording/reproducing apparatus (not shown) with the magnetic head insertion slot 28 facing forward, the tip of a shutter rotating arm (not shown) provided in the recording/reproducing apparatus will be aligned with the shutter 24.
As the disk cartridge is inserted, the shutter rotating arm rotates against the spring elasticity, and the shutter 24 slides open. When the disk cartridge is set in the load position, the shutter 24 is located above the magnetic head insertion opening 28 and the connecting recess 30, as shown in FIG. 3, and the magnetic head insertion opening 28 is completely opened. . Further, the narrow portion 39 of the shutter 24 overlaps the thin portion 31.

6 and 7 show the cleaning member 2
FIG. 3 is a diagram showing a modification example of No. 3; In this example, the cleaning member 23 is composed of a relatively hard substrate 43 with a cleaning layer 44 formed on one side thereof. As the substrate 43, a hard plastic sheet made of polyvinyl chloride, polyethylene, polyamide, etc., a thin metal plate, or the like is used.

Further, the cleaning layer 44 is formed of nonwoven fabric, sponge, flocked hair, or the like, and the substrate 43 and the cleaning layer 44 are integrated. Note that this cleaning member 23 is arranged so that the cleaning layer 44 faces the magnetic disk 22.

Further, as shown in FIG. 6, the board 43 is provided with a cutout 46 at a location corresponding to the magnetic head insertion port 28 of the cartridge case 21, and has a substantially C-shaped planar shape. An engaging protrusion 45 is formed in the. Although not shown, a recess is provided on the inner surface of the cartridge case 21 at a position facing the engagement protrusion 45, and the cleaning member 23 can move up and down within the cartridge case 21. Rotation is prevented by 45.

When this cleaning member 23 is used, even if the magnetic disk 22 is rotated at high speed, the flapping of the magnetic disk 22 is suppressed due to the own weight of the cleaning member 23 placed thereon, and moreover, the entire surface of the cleaning layer 44 is magnetically It comes into contact with the disk 22 and provides an excellent cleaning effect.

Note that the disk cartridge according to the present invention is
The present invention is effective not only when using the magnetic disk shown in the embodiment described above, but also when using a so-called optical disk that can be recorded and reproduced by optical means.

Further, the shutter 24 used in the disk cartridge according to the present invention is not limited to having the opening 34 as shown in the above embodiment, but may have only the closing portion 40 without the opening 34. . In this case, the narrow portion 39 may be connected to the closing portion 40 to constitute a reinforcing portion of the thin portion 31 of the case 21 .

〔Effect of the invention〕

As described above, the present invention has a structure in which a connecting recess that is one step lower than the case surface is provided between the head insertion opening of the case half, the edge of the head insertion opening, and the edge of the case closest to the case. It's getting old.

Therefore, a relief part is formed in the shape, and a sufficient stroke of the head in the radial direction of the recording disk can be obtained, so that information can be reliably written and read even on the outermost track of the recording disk, and the recording capacity can be increased.

Since the head insertion opening sides of the case halves are integrally connected by the connecting recess, partial warping unlike conventionally proposed disk cartridges can be suppressed. Therefore, the opening and closing operations of the shutter are performed smoothly, and generation of abrasion powder from the cartridge case can be effectively prevented.

It is also possible to step down the entire periphery of the head insertion opening of the case half to the same position as the connection recess and use the stepped surface as the shutter sliding surface, but this method has the following problems. are doing.

In other words, since the disk storage space inside the cartridge case needs to have a predetermined height, forming a stepped part by stepping down the entire periphery of the head insertion opening of the case half to the same position as the connecting recess means that The thickness of the stepped portion becomes extremely thin.

If the entire area around the head insertion opening becomes extremely thin, the flow of molten resin within the mold during cartridge case injection molding will be poor, which will not only reduce molding efficiency but also lead to a high molding defect rate. Become.

Furthermore, if the entire periphery of the head insertion opening becomes extremely thin, deformation such as warping occurs in that area, causing the shutter sliding surface to become uneven. Therefore, as the shutter is repeatedly opened and closed, abrasion powder is generated.
This will cause the problems mentioned above.

In this regard, in the present invention, since the shutter sliding surface is thicker than the connecting recess, the moldability of the case half is good.

Moreover, since the connecting recess is formed only in a width that is approximately the same as the head insertion opening, and the other part is a relatively thick shutter slide portion, there is almost no deformation in the connecting recess, and the shutter It has features such as smooth sliding and no generation of abrasion powder.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of a disk cartridge according to an embodiment of the present invention with the shutter removed;
The figure is a perspective view of the disk cartridge when not in use.
Fig. 3 is a perspective view of the disc cartridge in use, Fig. 4 is an enlarged sectional view of the main parts of the disc cartridge, Fig. 5 is a perspective view of the shutter, and Fig. 6 shows a modified example of the cleaning member. A plan view, FIG. 7 is an enlarged sectional view of the cleaning member, and FIG.
This figure is a perspective view of a conventionally proposed disk cartridge, and FIG. 9 is an exploded perspective view of a case half used in the disk cartridge. 21...Cartridge case, 22...Magnetic disk, 24...Shutter, 25...Upper case, 26...Lower case, 28...Magnetic head insertion slot, 29...Shutter slide section, 30...Connection Recessed portion, 32...〓between, 34...opening, 35...
Top plate part, 36... Bottom plate part, 37... Side part,
38...Resection part, 39...Narrow width part, 40...Occluded part.

Claims (1)

[Scope of Claims] 1. A cartridge case in which case halves of an upper case or a lower case are stacked on top of each other, each having a head insertion port on at least one side; and a recording disk rotatably housed within the cartridge case; In a disk cartridge equipped with a shutter for opening and closing a head insertion opening of a cartridge case, the shutter slides between the head insertion opening of the case half and the edge of the case closest to the edge of the head insertion opening. A disk cartridge characterized in that a connecting recess is provided which is lower than the case surface, and both sides of the head insertion opening of the case half are integrally connected by the connecting recess. 2. In claim 1, the shutter has at least a closing portion that closes the head insertion port, and a side portion provided at one end of the closing portion, and the shutter is in a closed position. A disk cartridge, wherein the head insertion opening and the connecting recess are closed by a closing part and a part of a side part of the shutter.