JPH0333986Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a disk cartridge such as a magnetic disk cartridge, and more particularly to a disk cartridge in which a pair of upper and lower cases are integrated by fusing them together.

As a conventionally known disk cartridge, there is particularly a magnetic disk cartridge as shown in the exploded perspective view of FIG. Referring to FIG. 1, a case 1 is made of synthetic resin and is composed of an upper case 2 and a lower case 3. The upper and lower cases 2 and 3 have a drive shaft insertion port 4 at a predetermined position.
A magnetic head insertion hole 5, an index hole 6, and a reference pin insertion hole 7 are formed respectively. A side A side erroneous erasing prevention detection hole 8 and a B side erroneous erasing prevention detection hole 9 are provided at symmetrical positions on both sides of the front surfaces of the upper and lower cases 2 and 3. 8, there is a notch 10 for identifying sides A and B.
is formed.

A magnetic disk 11 having magnetic layers formed on both sides of a base film is rotatably accommodated in the case 1, and the center portion of the magnetic disk 11 is held between hubs 12 from above and below. Shutters 13 are rotatably attached to the upper and lower cases 2 and 3, respectively, and are adapted to close the magnetic head insertion hole 5 and the index hole 6 when the disk cartridge is not in use. 14 is a flexible slider whose tip end is connected to the shutter 13;
Reference numeral 5 denotes a spring that biases the shutter 13 toward the closed position.

Reference numeral 16 denotes a side A side erasing prevention piece, and numeral 17 a side B side erasing prevention piece, which are molded from synthetic resin. A
The surface erroneous erasure prevention 16 is a pair of upper and lower elastic arms 16.
a, 16b, the elastic arms 16a, 16
Locking claws 16c and 16d are formed at the tips of b, respectively. A hooking portion 16e for sliding the erroneous erasure prevention piece 16 from the outside is provided protruding from between the elastic arms 16a and 16b. Similarly, the B side erroneous erasure prevention piece 17 has a pair of upper and lower elastic arms 17.
a, 17b, and a locking pawl 17 is provided at the tip of each.
c, 17d are formed, and elastic arms 17a, 17
A hooking portion 17e protrudes from between the portions b.

On the other hand, accommodation recesses 18 and 19 are formed in the inner surfaces of the upper case 2 and the lower case 3 at locations corresponding to the A-side erroneous erasure prevention detection hole 8 and the B-side erroneous erasure prevention detection hole 9, respectively. . Each accommodation recess 1
Cutout portions 22 for forming operation windows are formed on the front surfaces of 8 and 19, respectively.

By joining the upper case 2 and the lower case 3, a housing space is formed by the housing recess 18 of the upper case 2 and the housing recess 19 of the lower case 3, and the notch 22 of the upper case 2 and the lower case The A-side operation window is formed by the notch 22 of No. 3.
The A-side erroneous erasing prevention piece 16 is slidably housed in the housing space so that the engaging portion 16e of the A-side erroneous erasing prevention piece 16 faces the operation window.

In addition, the accommodation recess 19 of the upper case 2 and the lower case 3
An accommodation space is formed by the accommodation recess 19 of the upper case 2 and the lower case 3.
A side B side operation window is formed by the notch 22 . And the engaging portion 17e of the B-side accidental erasure prevention piece 17
Place the B-side accidental erasure prevention piece 1 so that it faces the operation window.
7 is slidably accommodated in the accommodation space.

Upper case 2 and lower case 3 are positioned by fitting them together. Therefore, recesses 23 are formed at a plurality of locations on the lower surface of the outer periphery of the upper case 2, and pin-shaped protrusions 24 are formed at a plurality of locations corresponding to the recesses 23 on the upper surface of the outer periphery of the lower case 3.

In the conventional example as described above, when the upper and lower cases 2 and 3 are integrated by heat-sealing the fitting portions of the recess 23 and the protrusion 24, the recess 23 and the protrusion 24 are very close to the sides of the case 1. Due to its location, the second
As shown in the figure, the burr 25 due to the fusion protrudes outward from the side surface of the case 1. The front surface of the cartridge case 1 is the reference surface for positioning when it is installed in a recording/playback device, so if the burr 25 protrudes from the front surface of the cartridge case 1, the cartridge will not be properly positioned, resulting in damage. This causes poor tracking.

In order to prevent the burr 25 from protruding, a structure as shown in FIG. 6 was considered. That is,
An annular storage portion 29 is formed around the opening in the recess 23 to store the synthetic resin melted by fusion.

However, in this structure, since the annular storage portion 29 is formed inside the outer peripheral wall 28 as described above, the outer peripheral wall 28 of the upper case 2 and the lower case 3 is
The width L is inevitably larger than that of the conventional one.
Therefore, especially in the lower case 3 in which the convex portion 24 is formed, the outer circumferential wall 28 becomes thick, and shrinkage during case molding is large, resulting in a dent in the lower surface 3a of the lower case 3, resulting in poor appearance.

The present invention has been made in view of the above points, and includes a cartridge case formed by fusing an upper case and a lower case, and a disk rotatably housed within the cartridge case. The lower surface of the upper case and the upper surface of the lower case each have an outer peripheral wall, and one of the upper case and the lower case has a protrusion, and the other case has a protrusion that fits into the protrusion. A plurality of concave portions are respectively provided, and among these convex portions and concave portions, at least the convex portions and concave portions located on the front side of the cartridge case are formed on the outer peripheral wall, and the convex portions and the concave portions are fitted. The object is a disk cartridge in which the lower surface of the outer circumferential wall of the upper case and the upper surface of the outer circumferential wall of the lower case come into contact with each other by fusing.

Further, the present invention is characterized in that a recessed notch is provided on the outer surface of the outer circumferential wall near the fused portion of the convex portion and the recessed portion located on the front side of the cartridge case.

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

FIG. 3 is an exploded perspective view in which only the front sides of the upper case and lower case are enlarged.

Three circular recesses 23 for positioning are formed on the lower surface of the outer peripheral wall 28 of the upper case 2.
A recessed notch 26 is formed toward each side, and the depth of the recessed notch 26 is approximately such that it reaches the side wall of the recessed portion 23.

Pin-shaped protrusions 24 for positioning are also formed on the upper surface of the outer circumferential wall 28 of the lower case 3 at three locations corresponding to the recesses 23, and on the case side surface 3a near the protrusions 24, Concave notches 27 corresponding to the concave notches 26 are formed toward the convex portions 24, and the depth of the concave notches 27 is approximately the same as the convex portions 24.
It is about the extent that it reaches the root of.

The upper case 2 and the lower case 3 are positioned by fitting the concave portion 23 and the convex portion 24, and then the fitted portions of the concave portion 23 and the convex portion 24 are fused together using ultrasonic waves or the like. A part of the synthetic resin melted by the fusion protrudes outward as a burr, but as shown in FIG.
Since the concave notches 26 and 27 are recessed from 3a, even if the burr 25 protrudes, the concave notches 2
6, 27, and does not protrude outward from the case side surfaces 2a, 3a.

As shown in FIG. 4, when the concave portion 23 and the convex portion 24 are fitted and fused together, the outer circumferential wall 28 of the upper case 2 and the outer circumferential wall 28 of the lower case 3 are brought into contact with each other. Since the outer peripheral walls 28 of the upper and lower cases 2 and 3 come into contact with each other, the outer peripheral walls 28
Each of them functions as a kind of stopper, so that the total thickness of the cartridge case 1 can be kept constant, and product dimensions can be properly controlled.

If the outer peripheral walls 28 of the upper and lower cases 2 and 3 are not in contact with each other, some of the recesses 2
3 and the protrusion 24 becomes excessive than other parts, the total thickness of the cartridge case 1 will differ in some parts, and in severe cases, the cartridge case 1 will be deformed, resulting in poor product quality. This will lead to a decline.

Further, in the embodiment described above, the recessed portions 26 and 27 are in the form of notches that communicate with the upper and lower surfaces of the upper case 2 and the lower case 3 as shown in FIGS. 3 and 4, but as shown in the cross-sectional view of FIG. The shape may be such that it does not penetrate through the upper and lower surfaces.

Further, in the embodiment, a recessed part is formed in both the upper case 2 and the lower case 3, but it is also possible to provide only one of them depending on how the burr 25 protrudes.

Since the present invention is structured as described above,
Even if some burrs occur due to fusion, they are stored in the recess and do not protrude from the front of the cartridge case, so the disk cartridge can be set in the correct position without wobbling when installed in a recording/playback device. .

Further, since the recessed portion is provided on the outer surface of the outer circumferential wall, the outer circumferential wall can be formed thinner than a structure in which an annular storage portion is formed inside the outer circumferential wall as shown in FIG. Therefore, no dents are formed due to shrinkage during case molding, and no appearance defects occur.

[Brief explanation of drawings]

Fig. 1 is an exploded perspective view of a conventional magnetic disk cartridge, Fig. 2 is a sectional view showing the protruding state of burrs in the conventional magnetic disk cartridge, and Fig. 3 is an exploded perspective view of a conventional magnetic disk cartridge.
The figure is an exploded perspective view showing only the tip of a magnetic disk cartridge according to an embodiment of the present invention, FIG. 4 is a cross-sectional view of a main part of an embodiment of the present invention, and FIG. FIG. 6 is a cross-sectional view of a main part of a disc cartridge that has been studied in the past. 1... Cartridge case, 2... Upper case,
3...Lower case, 11...Magnetic disk, 23...
... recessed part, 24 ... convex part, 26, 27 ... recessed part,
28...Outer peripheral wall.

Claims (1)

[Scope of Claim for Utility Model Registration] A cartridge case formed by fusing an upper case and a lower case, and a disk rotatably housed within the cartridge case, the upper case The lower surface and the upper surface of the lower case each have an outer peripheral wall, one of the upper case and the lower case is provided with a protrusion, and the other case is provided with a plurality of recesses that fit into the protrusion. Among these protrusions and recesses, at least the protrusions and recesses located on the front side of the cartridge case are formed on the outer peripheral wall, and by fitting and fusing the protrusions and recesses, the upper In a disk cartridge in which the lower surface of the outer peripheral wall of the case is in contact with the upper surface of the outer peripheral wall of the lower case, a recessed notch is provided on the outer surface of the outer peripheral wall near the fused portion of the convex part and the recessed part located on the front side of the cartridge case. A disk cartridge characterized by being provided with.