JPH0437352Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a disk cartridge that houses therein a disk for recording information or reproducing recorded information.

Recording of information on or reproduction of information from the disk housed inside the disk cartridge is performed by inserting a recording or reproduction head through an insertion window provided in the disk cartridge. Such a conventional disk cartridge is shown in FIGS. 1 and 2.

FIG. 1 is an exploded perspective view of a conventional disk cartridge, and FIG. 2 is a plan view of the lower case including the shutter member shown in FIG.

In FIGS. 1 and 2, 1 is a case body made of synthetic resin, and this case body 1 is composed of an upper case 2 and a lower case 3 which are divided into two parts. These upper and lower cases 2 and 3 are joined together by ultrasonic welding means with their peripheral walls 4 and 5 abutted against each other. Case body 1
Near the front of the case, through holes 6, 6 are formed in the upper and lower cases 2, 3 so as not to prevent the entry of a drive shaft P of a recording/reproducing device (not shown). Reference numeral 7 denotes a sheet-shaped disk located concentrically with the through hole 6 and housed within the case body 1. Although there are disks 7 that use magnetism and disks that use light, the following explanation will use a magnetic disk as a representative example. Reference numerals 8 and 9 denote partition walls formed on the inner wall surfaces of the upper and lower cases 2 and 3 to almost surround the setting area S of the magnetic disk 7, and are formed in an almost annular shape to reinforce the upper and lower cases 2 and 3 and to surround the setting area S. It serves the dual purpose of preventing dust from entering the S. Reference numerals 10 and 11 designate a pair of upper and lower hubs made of synthetic resin, which are joined to each other to sandwich the magnetic disk 7 and also have a through hole 6.
It is rotatably fitted in the 12, 12 is located on the front side of the case body 1 and is a disk setting area S.
This is a magnetic head insertion window formed in the radial direction of the disk 7 (in the direction of arrow a), and is constituted by an elongated hole that does not hinder the movement of the magnetic head H moving in the radial direction of the disk 7 (in the direction of arrow a). 13 and 14 are annular walls formed concentrically with the drive shaft penetration hole 6 in the upper and lower cases 2 and 3;
Shutter members 15 and 16 open and close the magnetic head insertion windows 12 and 12 in the upper and lower cases 2 and 3, respectively. These shutter members 15, 16
are usually formed from a metal plate, and the fitting holes 17 and 18 formed at the base end of each are connected to the annular wall 13,
14, it is possible to rotate between the open position and the closed position. 1
9 and 20 are respective setting recesses of the shutter members 15 and 16 formed in the upper and lower cases 2 and 3, respectively;
1 and 22 are selector display openings formed in the upper and lower cases 2 and 3, and 23 are display openings 21 and 2.
an opening formed in the magnetic disk 7 corresponding to 2;
Reference numerals 24 and 25 indicate notch holes formed in the shutter members 15 and 16 corresponding to the display openings 21 and 22.

Reference numeral 26 denotes a slider for opening and closing the shutter members 15 and 16, and is formed into a belt shape of, for example, synthetic resin so that it can be flexibly deformed in accordance with the curved portion of the sliding groove, which will be described later. At the tip of the slider 26, cutout engaging portions 27 and 28 are formed on the upper and lower end surfaces to engage with the free ends 15a and 16a of the pair of shutter members 15 and 16, and An outwardly tapered surface 29 is formed. Reference numeral 30 denotes a spring hook protruding from the inner surface of the base end of the slider 26. 31, 31 are sliding grooves into which the upper and lower edges of the slider 26 are fitted;
Stopper wall 3 in closed position of shutter members 15, 16
2 (clearly shown in FIG. 2), the curved portion 31a extends rearward in an arc shape from a position forward in the closing direction along the outer edge of the front side of the magnetic disk setting area.
and a straight portion 31b extending from the curved portion 31a to the rear of the case body 1. Reference numeral 33 denotes a return spring installed between the slider 26 and the case body 1, one end 33a of which is engaged with the spring hook 30 of the slider 26, and the other end 33b of which is attached to the closed position of the shutter members 15, 16. slider 2 in
6, and is locked to a locking pin 34 protruding from the inner wall of the lower case 3,
As a result, the spring 33 applies a spring force to the slider 26 in the direction of pushing the shutter members 15, 16 to the closed position. Reference numeral 35 designates a protrusion that is formed on the outer surface of the base end of the slider 26 and is operated externally. Note that 36 and 36 are members for preventing erroneous erasure of recorded contents.

Next, how to use such a disk cartridge will be explained.

When the case body 1 is inserted forward into a recording and reproducing device (not shown), the operated protrusion 35 of the slider 26 is engaged with a member (not shown) on the recording and reproducing device side as a result of this forward insertion operation. As a result, the slider 26 moves backward against the spring force of the return spring 33, rotates the shutters 15 and 16 to the open position as shown by the solid line in FIG. 2, and opens the head insertion window 1.
2, 12, the selector display openings 21, 22 are opened. By opening the head insertion window 12, the magnetic head H is inserted into the magnetic disk 7, and the magnetic disk 7 is rotated by the drive shaft P that engages with the hubs 10 and 11.
It is possible to record information on the magnetic disk 7 or reproduce information recorded on the magnetic disk 7. Case body 1
When the slider 26 is pulled out from the recording/reproducing apparatus, the slider 26 moves forward under the spring force of the return spring 33, and rotates the shutter members 15, 16 back to the closed position as shown by the dashed line in FIG. The insertion window 12 and the like are closed to prevent dust and the like from adhering to the magnetic disk 7.

In the conventional disk cartridge as described above, each time the disk cartridge is used, the shutter members 15 and 16 move into the recesses 1 of the cases 2 and 3.
9 and 20. By the way, whereas the shutter members 15 and 16 are usually made of metal, the recesses 19 and 20 of the cases 2 and 3
Since these are made of synthetic resin, the surfaces of the recesses 19 and 20 are scraped by the edges of the shutter members 15 and 16 every time the shutter members 15 and 16 slide. This state is shown in FIG.

FIG. 3 is a sectional view for explaining how the setting recess of the lower case is cut by the shutter member, and only necessary parts are shown. 3 is the lower case, 12 is the head insertion window, 16a is the free end of the shutter member 16, 20 is the setting recess of the shutter member 16, and S is the setting area of the magnetic disk 7, which are shown in FIG. is the same as 12a is the edge of the head insertion window 12, and 16b is the free end 16.
One edge that comes into sliding contact with the surface of the setting recess 20 of a, 1
6c is the other edge.

Now, when the disk cartridge is inserted into the recording/reproducing device, the shutter member 16 moves from the closed position of the head insertion window (dotted chain line position in Figure 2) to the open position (solid line position in Figure 2) as described above. do. At this time, the free end 16 of the shutter member 16
a will move in the direction of arrow b in FIG. 3, and its edge 16b will slide on the surface of the recess 20. Edge 1
Since 6b is made of metal and has an angle of approximately 90 degrees, when it slides, it scrapes the surface of the recess 20, producing fine powdery chips. Code 3 in Figure 3
7 shows an enlarged view of this shavings. When the disk cartridge is pulled out from the recording/reproducing apparatus, the free end 16a similarly moves in the direction of arrow C, and the surface of the recess 20 is scraped by the edge 16c, producing shavings. In particular, since the lower case 3 is manufactured by molding, the edge 1 of the head insertion window 12
So-called burrs are formed on the head 2a, and when the free end 16a opens and closes the head insertion window 12, the burrs are scraped off and become scraps. The above-mentioned condition similarly occurs in the setting recess 19 of the upper case 2 and the shutter member 15.

In this way, a considerable amount of shavings are generated each time the shutter members 15 and 16 are opened and closed, and adhere to the surface of the magnetic disk 7, adversely affecting information recording and reproduction.

SUMMARY OF THE INVENTION An object of the present invention is to provide a disk cartridge which eliminates the above-mentioned drawbacks of the conventional art and which can prevent the shutter member from producing shavings on the case surface.

In order to achieve this object, the present invention is characterized in that the edge of the shutter member that comes into sliding contact with the case surface including the head insertion window is provided with a curved surface.

The present invention will be explained below based on the embodiments shown in FIGS. 4, 5, and 6.

FIG. 4 is an enlarged sectional view of a shutter member of a disk cartridge according to an embodiment of the present invention. In the figure, 16b and 16c are edges at the free end 16a of the shutter member shown in FIG. 3. In this embodiment, the edges 16b and 16c are shaved off by appropriate means to form a curved surface 16d.
Therefore, the free end 16a is connected to the head insertion window 12.
Even if it moves from side to side in the figure while sliding with the setting recess 20 for opening and closing, the setting recess 20 will not be scraped because the edges 16b and 16c are not present and the curved surface 16d is formed. This prevents the generation of shavings.

FIG. 5 is an enlarged sectional view of a shutter member of a disk cartridge according to another embodiment of the present invention.
In this embodiment, the edge 16 of the free end 16a
b, 16c, this is bent in a direction away from the surface of the setting recess 20 to form a curved surface 16e. Naturally, the curved surface 16e is formed so that the bent portion does not come into contact with the magnetic disk 7. By forming the curved surface 16e, the edges 16b, 16
c does not come into sliding contact with the surface of the setting recess 20, thus preventing the generation of shavings.

FIG. 6 is an enlarged sectional view of a shutter member of a disk cartridge according to still another embodiment of the present invention. In this embodiment, as in the embodiment shown in FIG. 4, the edges 16b and 16c of the free end 16a are shaved off, and the edge on the side that does not come into sliding contact with the setting recess 20 is also shaved off. A curved surface 16f with no corners at all is formed at the periphery of the free end portion 16a. This prevents the generation of shavings from the surface of the setting recess 20, and furthermore, no matter what part or member comes into contact with the periphery of the free end 16a, it will not damage it or remove the shavings from it. It will never occur.

As described above, in the present invention, since the edge of the shutter member is provided with a curved surface, it is possible to prevent the generation of shavings from the surface that makes sliding contact with the shutter member.

[Brief explanation of the drawing]

Fig. 1 is an exploded perspective view of a conventional disk cartridge, Fig. 2 is a plan view of the shutter member and lower case shown in Fig. 1, and Fig. 3 is a diagram for explaining the generation of shavings by the conventional shutter member. 4, 5, and 6 are all sectional views of the shutter member of the disk cartridge according to the embodiment of the present invention. DESCRIPTION OF SYMBOLS 1...Case body, 2...Upper case, 3...Lower case, 7...Disk, 12...Head insertion window, 15, 16...Shutter member, 15a, 16
a...Free end portion, 16d, 16e, 16f...Curved surface.

Claims (1)

[Scope of utility model registration request] A synthetic resin case, a disk housed in the case, an insertion window for an information recording/reproducing head provided in the case facing the disk, and a shutter member for opening and closing the insertion window. The disk cartridge is characterized in that the shutter member is formed of a metal plate, and a curved surface is provided on the edge of the shutter member that makes sliding contact with the surface of the synthetic resin case that includes the insertion window. .