JPH10199182A - Media jacket and disk cartridge provided with the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable the vertical movement of an upper magnetic head by the minimum movement without forcing a burden on a mechanism which makes the upper magnetic head move vertically. SOLUTION: A head window arranged on a main body of the jacket comprises an upper notched part 12a formed on an upper shell 12 and a lower notched part 13a formed on a lower shell 13. A shutter window 20a is arranged on the shutter 20 by means of excavating the upper, lower and front surfaces of the shutter 20 at the position corresponding to the head window.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disk cartridge, such as a floppy disk (hereinafter abbreviated as FD), which houses a magnetic disk medium, and more particularly to a media jacket.

[0002]

2. Description of the Related Art Hereinafter, a 3.5-inch FD will be described as an example of a disk cartridge. 4 and 5 show the structure and appearance of a conventional 3.5-inch FD 10 '. 4 and 5 are disclosed on page 160 of a book entitled "All About Floppy Disk Drives", published by CQ Publishing Co., Ltd. on July 10, 1990, by Shoji Takahashi. Have been.

[0003] An FD 10 'moves a magnetic disk medium 11 between an upper shell 12' and a lower shell 13 '.
Is housed through. Here, the upper shell 12 '
The combination of and the lower shell 13 'will be referred to as a jacket body. That is, the magnetic disk medium 11 is housed in the jacket body. A head window is formed in the jacket body so as to be accessible by a magnetic head (not shown) of a floppy disk drive (hereinafter abbreviated as FDD). In particular, a conventional head window comprises an upper shell 12 '.
The upper head window 12'a is a rectangular hole formed in the lower shell 13 'and the lower head window 13'a is a rectangular hole formed in the lower shell 13'.

A magnetic disk medium 11 has an opening 1 at the center.
1a, the opening 11a has a donut shape.
At a, it is supported by a circular metal hub 16 via an A-ring 15. A center plate 17 is interposed between the metal hub 16 and the upper shell 12 '. A lifter 18 and a write protector 19 are attached to the upper shell 12 '. The lifter 18 presses the liner 14 against the magnetic disk medium 11. The lower shell 13 'is provided with a circular opening 13b for exposing a concave portion of the metal hub 16. A-ring 15
The lifter 18 may not be provided due to the component configuration of the FD.

[0005] The FD 10 'is further provided with a metal shutter 20' for extending and retracting the head window. The shutter 20 'is closed when the FD 10' is discharged from the FDD. This prevents dust and dirt from entering the inside of the jacket main body, and makes it less likely that a person accidentally touches the recording surface of the magnetic disk medium 11. The shutter 20 'has a shutter window that can be moved in and out of the head window. Specifically, a conventional shutter window is a shutter 20 '.
The upper shutter window 20'a, which is a rectangular hole drilled at a position corresponding to the upper head window 12'a on the upper surface of the shutter, and a position corresponding to the lower head window 13'b on the lower surface of the shutter 20 '. And an upper shutter window 20'b which is a rectangular hole formed in the upper surface.
The shutter 20 'is urged in the direction of arrow A in FIG. 5 by a shutter spring 21 attached to the lower shell 13'. Note that FIG.
This shows a state in which the shutter 20 'is slid in the direction opposite to the direction of arrow A against the urging force of the spring 21 to open the shutter 20' and expose the head window. Here, the combination of the jacket body and the shutter 20 'will be referred to as a media jacket.

[0006] The metal hub 16 is composed of an FDD and an FD 10 '.
It is for chucking with. More specifically, the metal hub 16 has a center hole 16a at the center and a chucking hole 16b at a peripheral position eccentric from the center hole 16a. A spindle shaft (not shown) of a spindle motor (not shown) for rotating the FD 10 'passes through the center hole 16a, and a chucking pin of the spindle motor passes through the chucking hole 16b. You.

[0007] The write protector 19 is called a write protect tab, and is used to switch the presence or absence of a write protect hole 22 which is a write-protection hole formed in the jacket body. When the write protect hole 22 is closed, writing is enabled, and when the write protect hole 22 is opened, writing is prohibited. The jacket body also has a light protect
A hole 23 for recognizing high density (HD) FD is formed at a symmetric position of the hole 22. A label area 24 is provided on the surface of the upper shell 12 '.

[0008]

As described above, in the conventional media jacket, the head window provided on the jacket body is formed by a rectangular upper head window 12 'formed in the upper shell 12'. a, and a rectangular lower head window 13'a formed in the lower shell 13 ', and a shutter window provided in the shutter 20' is provided on the upper surface of the shutter 20 '. Upper shutter window 20'a drilled at a position corresponding to window 12'a, and upper shutter window 2 drilled at a lower surface of shutter 20 'at a position corresponding to lower head window 13'b.
0'b.

As described above, the FDD has a magnetic head for accessing the magnetic disk medium 11 from the head window of the FDD. This magnetic head is held by a carriage assembly. More specifically, the carriage assembly has an upper carriage and a lower carriage, and the upper and lower carriages respectively hold the upper and lower magnetic heads at the distal ends thereof. That is, the magnetic head comprises a pair of upper and lower magnetic heads. When the FD 10 'is ejected from the FDD, the FDD engages with a disk holder unit that accommodates the FD 10' in order to separate the upper magnetic head from the lower magnetic head. In this state, the tip of the upper carriage is lifted. Since the thickness of the FD 10 'is about 3.3 mm, the construction of the conventional media jacket requires that the tip of the upper carriage be raised in the range of about 3.5 to 3.6 mm. As described above, in the conventional media jacket, the mechanism for moving the magnetic head of the FDD up and down needs to be moved in the range of the thickness of the FDD or more, which imposes a burden. Furthermore, since the amount of movement of the upper magnetic head in the vertical direction is large, the spring mechanism of the head support that supports the upper magnetic head is complicated, and the head load pressure applied downward to the upper magnetic head is not stable. There is a problem.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a medium which can be moved by a minimum vertical movement of the upper magnetic head without imposing a burden on a mechanism for moving the upper magnetic head vertically. To provide a jacket.

Another object of the present invention is to provide a media jacket which can simplify a spring mechanism of a head support for holding an upper magnetic head.

Still another object of the present invention is to provide a medium which can easily stabilize the head load pressure of the upper magnetic head.
To provide a jacket.

[0013]

According to the present invention, there is provided a media jacket for accommodating a magnetic disk medium therein, wherein a head window is formed which enables the magnetic head to access the magnetic disk medium. A jacket body, and a shutter for extending and retracting the head window, wherein the jacket body has an upper shell and a lower shell that interpose the magnetic disk medium therebetween.
The head window includes an upper cutout portion formed in the upper shell, and a lower cutout portion formed in the lower shell, and the shutter includes a shutter window that can move in and out of the head window. Wherein the shutter window is formed by piercing an upper surface, a lower surface, and a front surface of the shutter at a position corresponding to the head window.
A jacket is obtained.

[0014] In the above-mentioned media jacket, it is preferable that the media jacket further includes a jacket reinforcing member extending left and right at a front edge of the head window, being sandwiched between the upper shell and the lower shell. Further, the shutter may include a shutter reinforcing portion bridging between left and right at a front end of the shutter window. in this case,
It is desirable that the thickness of the shutter reinforcing portion is not more than 1/3 of the thickness of the jacket body.

[0015]

Embodiments of the present invention will be described below in detail with reference to the drawings.

Referring to FIG. 1 and FIG. 2, 3.5 having a media jacket according to the first embodiment of the present invention.
The inch FD10 will be described in detail. Figure 1 shows the FD1
FIG. 2 is an exploded perspective view showing the structure of the FD 10, FIG. 2 is a view showing the appearance of the FD 10, (a) is a front view, (b) is a side view,
(C) is a rear view.

The illustrated FD 10 has a similar structure except that the shapes (structures) of the upper shell, the lower shell, and the shutter are different from those shown in FIGS. Therefore, the upper shell, lower shell, and shutter
The reference numerals 12, 13, and 20 are assigned respectively.

That is, in this embodiment, the head window formed in the jacket body is the upper shell 1.
2 and an upper notch 12a formed in the lower shell 13
And a lower cut-out portion 13a formed at the bottom. Also, the shutter 20 has a shutter window 20a at a position corresponding to the head window,
It is formed by piercing the lower surface and the front surface.

As described above, the conventional head window is a hole, whereas the head window of the present embodiment is a notch. Also, while the conventional shutter window was a hole, the shutter
The window is notched.

With such a structure of the media jacket, when the FD 10 is inserted into and ejected from the FDD, the amount of moving the upper magnetic head of the FDD up and down can be extremely small. This is because the portion of the head window through which the magnetic head accesses the magnetic disk medium 11 is not a hole but a cut-out portion. This is because it can be made slightly larger than the maximum range in which the disk medium 11 moves up and down. The maximum range in which the magnetic disk medium 11 moves up and down is about 1 mm, which is not more than 1/3 of the thickness of the FD 10 (about 3.3 mm).

Therefore, the amount of movement of the upper magnetic head can be made smaller than in the prior art, so that it is possible to move the upper magnetic head with minimal vertical movement without imposing a burden on the mechanism for moving the upper magnetic head. Further, the spring mechanism of the head support for holding the upper magnetic head can be simplified. Further, since the amount of vertical movement of the upper magnetic head is small, the head load pressure of the upper magnetic head can be easily stabilized. Also, the shutter window 20 of the shutter 20 moves in the carriage operation direction.
Since a is open, the height of the magnetic head can be reduced,
It is advantageous for high speed access and vibration characteristics.

In the above-described embodiment, since both the head window and the shutter window are notched, the strength of the upper shell 12, the lower shell 13, and the shutter 20 is slightly lower than those of the related art. Therefore, it is preferable to have a means for reinforcing the strength.

FIG. 3 shows a media jacket according to a second embodiment of the present invention provided with such reinforcing means. That is, the illustrated jacket body includes a jacket reinforcing member 25 extending left and right at a front edge of the head window and sandwiched between the upper shell 12 and the lower shell 13. The jacket reinforcing member 25 is made of a thin metal plate. Further, the shutter 20 includes a shutter reinforcing portion 26 that bridges between the left and right at the front end of the shutter window. The thickness of the shutter reinforcing portion 26 is not more than 1/3 of the thickness of the jacket body. Since the thickness of the shutter reinforcing portion 26 is less than 1/3 of the thickness of the jacket body, the maximum range in which the magnetic disk medium 11 moves up and down is 1/3 or less of the thickness of the FD 10 as described above. Because it is.

The present invention is not limited to the above-described embodiments, and it is needless to say that various changes and modifications can be made without departing from the spirit of the present invention. For example, the media according to the present invention
The jacket is not only applicable to the 3.5-inch FD, but is applicable to other disk cartridges.

[0025]

As is apparent from the above description, in the present invention, since the head window and the shutter window are not holes but notches, the amount of movement of the upper magnetic head can be made smaller than before. Accordingly, the upper magnetic head can be moved up and down with a minimum, without imposing a burden on a mechanism for vertically moving the upper magnetic head. Also,
The spring mechanism of the head support that holds the upper magnetic head can be simplified. Further, the head load pressure of the upper magnetic head can be easily stabilized.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view showing a structure of a 3.5-inch FD provided with a media jacket according to a first embodiment of the present invention.

FIGS. 2A and 2B are views showing the appearance of the 3.5-inch FD shown in FIG. 1, wherein FIG. 2A is a front view, FIG. 2B is a side view, and FIG.

FIG. 3 is a partially exploded perspective view showing a structure of a media jacket according to a second embodiment of the present invention.

FIG. 4 is an exploded perspective view showing a structure of a conventional 3.5-inch FD provided with a media jacket.

5A and 5B are diagrams showing the appearance of the 3.5-inch FD shown in FIG. 4, wherein FIG. 5A is a front view, FIG. 5B is a side view, and FIG.

[Explanation of symbols]

 12 Upper Shell 12a Upper Notch 13 Lower Shell 13a Lower Notch 20 Shutter 20a Shutter Window 25 Jacket Reinforcement Member 26 Shutter Reinforcement

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Yoshinori Tanki 1601 Sakai, Atsugi-shi, Kanagawa Mitsumi Electric Co., Ltd.

Claims (4)

[Claims] 1. A media jacket for housing a magnetic disk medium therein, said jacket body having a head window formed therein for enabling access to said magnetic disk medium by a magnetic head, and said head window And a shutter for causing the magnetic disk medium to intervene, wherein the jacket body has an upper shell and a lower shell that interpose the magnetic disk medium therebetween.
In the jacket, the head window includes an upper cutout portion formed in the upper shell, and a lower cutout portion formed in the lower shell, wherein the shutter is a shutter that can be moved in and out of the head window. A media jacket having a window, wherein the shutter window is formed by piercing an upper surface, a lower surface, and a front surface of the shutter at a position corresponding to the head window; 2. The apparatus according to claim 1, further comprising a jacket reinforcing member extending left and right at a front edge of the head window and sandwiched between the upper shell and the lower shell. The described media jacket. 3. The shutter according to claim 1, further comprising a shutter reinforcing portion bridging between the left and right at a front end of a front shutter window, wherein the thickness of the shutter reinforcing portion is one of the thickness of the jacket body.
The media jacket according to claim 1 or 2, wherein the media jacket is not more than / 3. 4. A disk cartridge provided with the media jacket according to claim 1.