JPH0216462Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention relates to an improvement of a disk cartridge typified by a floppy disk.

[Conventional technology]

As shown in FIG. 1, this type of disk cartridge consists of a rectangular jacket 1 in which a disk 12 is rotatably housed. The jacket 1 conventionally has a back cover 3 on one side of a front cover 2 made of a synthetic resin sheet, as shown in FIG.
are connected to each other via an imaginary polygonal line 4, and welding margins 5 are continuous to each of the remaining three sides of the front cover 2 via an imaginary polygonal line 6. The front cover 2 and the back cover 3 are overlapped with each other by heating and softening the parts corresponding to the virtual fold line 4 and bending them. After that, the upper and lower welding allowances 5, 5 are made by imaginary polygonal lines 6, 6.
The parts corresponding to the above are similarly softened by heating, bent, and heat welded to the outer surface of the back cover 3. After inserting the disk 12 through the opening on the back side of the unwelded part, the welding margin 5 on the back side is attached to the back cover. It is folded and thermally welded onto the outer surface of 3 (for example, Utility Model Application No. 58-94180).

However, according to the developed shape of the jacket 1 described above, the corner A where the imaginary polygonal lines 6 and 6 of the front cover 2 orthogonally intersect remains at right angles, so the welding margin 5 is When the jacket is softened and bent by heating, the corner A of the jacket 1 may protrude outward from each side by approximately t = 0.1 to 0.2 mm, as shown in Figure 1, and this is the largest factor in dimensional variation. It was discovered that the disk drive could not be set correctly in the specified position.

Furthermore, as shown in FIG. 9, there is a conventional jacket in which the corner A where the imaginary polygonal lines 6, 6 of the welding margins 5, 5 of the front cover 2 intersect is rounded off. No. 94671). According to this, the protrusion problem of the corner portion A is solved, but since the edge 5a of the welding margin 5 is formed in a straight line that is orthogonal to the imaginary polygonal line 6 and the outer edge 5b, this problem is solved. When the welding margin 5 is folded over the outer surface of the back cover 3, the edges 5a of the adjacent welding margins 5, 5 are separated by a large distance, as shown in FIG. The welding margin 5.5 cannot be pressed firmly enough. For this reason, the front and back covers 2,
It is recognized that there is a problem that a gap is likely to be formed between the overlapping corners of No. 3, through which dust can enter, impairing the sealing performance.

[The problem that the idea aims to solve]

This idea solves these problems by improving the shape of the corners between the adjacent welds of the front cover of the jacket, thereby ensuring sealing performance and stabilizing the dimensions. purpose.

[Means to solve the problem]

In the jacket of the disk cartridge according to this invention, for example, as shown in FIG. The edges 5a, 5a of the welding allowances 5, 5 are formed into an inclined shape intersecting the outer edge 5b, and the edges 5a, 5 are
By forming a notch 10 in a shape that extends further into the front cover than the end edge 5a in the middle between the edges 5a and 5a, the corners where the imaginary fold lines 6, 6 of the front cover 2 intersect at right angles can also be formed. It is a cut-off piece.

[Effect]

In such a case, welding allowance 5, as shown in Figure 4.
5 is folded over the outer surface of the back cover 3 along the imaginary fold lines 6, 6, the corners where the imaginary fold lines 6, 6 of the front cover 2 intersect are cut off by the notches 10. Therefore, it does not protrude outward from the front cover.

An inclined edge 5a of the welding margins 5, 5,
5a can be opposed to each other as close as possible to each other on the outer surface of the corner portion of the back cover 3, so the corner portions of the back cover 3 can be placed against the front cover 2 using the welding allowances 5, 5. It can be pressed firmly enough,
By cutting the corners, it is possible to reduce as much as possible the gap that tends to occur between the overlapping corners of the imaginary folded lines 6, 6 of the front cover 2 and the corners of the back cover 3.

[Effect of idea]

According to this invention, the corners of the outer edges 5b, 5b of the adjacent welding allowances 5, 5 of the front cover 2, which are perpendicular to each other, are cut off in a straight line to form the edges of the welding allowances 5, 5.
By forming the welding margins 5, 5a in an inclined shape that intersects the outer edge 5b, when the welding margins 5, 5 are folded over the outer surface of the back cover 3, both end edges 5a, 5a can be made as close to each other as possible. I made them stand close together and face each other.
Therefore, the corner can be sufficiently sealed, which is advantageous in preventing dust from entering from there. Moreover, the edge 5 is placed in the intermediate region between the inclined edges 5a, 5a of the adjacent welding allowances 5, 5.
By forming the notch 10 that extends further into the front cover than a and 5a, the corners where the imaginary fold lines 6 and 6 of the front cover 2 intersect at right angles are also cut off. The corner portions do not protrude outward from the front cover, making it possible to obtain a product with stable dimensions.

〔Example〕

3 to 7 show embodiments of the disk cartridge according to the present invention.

In FIG. 5, the basic planar shape of the jacket 1 is almost the same as the conventional jacket shape shown in FIG.
The back cover 3 is connected to one side via the virtual fold line 4, and the remaining three sides of the front cover 2 are each provided with a welding allowance 5.
are connected via an imaginary polygonal line 6, and a central window 7, a head window 8, and an index hole 9 are opened in the front cover 2 and back cover 3, and a nonwoven fabric liner 13 is provided in the front and back covers 2 and 3.
It is lined with

In this invention, as shown in FIG. 6, the corners of the outer edges 5b, 5b of the adjacent welding allowances 5, 5 of the front cover 2, which intersect at right angles, are cut in a straight line to form the welding allowances 5, 5. The edges 5a, 5a are formed in an inclined shape to intersect the outer edges 5b, 5b through a virtual intersection G where the virtual polygonal lines 6, 6 intersect, or a position near this point. By forming a notch 10 in the middle between the edges 5a, 5a, which extends further into the front cover than the edges 5a, the corners where the imaginary fold lines 6, 6 are orthogonal are formed. Also cut off the corners. Further, as shown in FIG. 7, a notch 11 is similarly formed at the intersection of the edge 5a of the welding margin 5 of the front cover 2 and the side edge 3a of the back cover 3.
In addition, in Figures 6 and 7, the shaded area F
1 shows a punched portion for forming notches 10 and 11.

In such a case, after superposing the front and back covers 2 and 3 by overheating and softening the part corresponding to the imaginary polygonal line 4 between the front cover 2 and the back cover 3, the upper and lower welding margins 5, 5 are aligned with the imaginary polygonal lines 6, 6. Similarly, the corresponding part is heated and softened, bent and overlaid on the outer surface of the back cover 3 and heat welded.The disk 12 is inserted through the opening on the rear side of the unwelded part, and the welding margin 5 on the rear side is Fold it back and heat weld it to the outer surface of the back cover 3. As shown in FIG. 4, the disk cartridge thus obtained can eliminate the protrusion of the corner A of the front cover 2 at the corner of the jacket 1 as shown in FIG. A hermetically sealed state was obtained in which the edges 5a, 5a of 5, 5 were brought as close to each other as possible in a parallel state.

[Brief explanation of the drawing]

FIG. 1 is a rear view of a conventional disk cartridge, and FIG. 2 is a developed plan view of the jacket. Figures 3 to 7 show an embodiment of the disk cartridge according to the present invention, with Figure 3 being an overall perspective view, Figure 4 being an enlarged rear view of the corner of the jacket, and Figure 5 being an enlarged rear view of the corner of the jacket. 6 and 7 are all enlarged developed plan views of the corners of the jacket. FIGS. 8 and 9 show other conventional examples, with FIG. 8 being a rear view of the disk cartridge and FIG. 9 being a developed plan view of the jacket. 1... Jacket, 2... Front cover, 3... Back cover, 4, 6... Virtual polygonal line, 5... Welding allowance,
5a... Edge of welding allowance, 5b... Outer edge of welding allowance, 10... Notch, 12... Disc.

Claims (1)

[Claims for Utility Model Registration] Jacket 1 that rotatably houses a disk 12
Rectangular front and back covers 2 and 3 are overlapped with each other.
, and the back cover 3 has a virtual polygonal line 4 on one side of the front cover 2.
Welding allowances 5 are connected to each of the remaining three sides of the front cover 2 via an imaginary polygonal line 6, and the outer edges 5 of the adjacent welding allowances 5, 5 of the front cover 2 are
The edges 5a, 5a of the welding allowances 5, 5 are formed into an inclined shape that intersects the outer edge 5b by cutting the orthogonal corners of the welding margins 5, 5 into a straight line, and the edges 5a, 5a are cut in a straight line. In the middle part of the edge 5a
Notch 1 that goes further inward than the front cover
0, and the corners where the imaginary fold lines 6, 6 of the front cover 2 intersect at right angles are rounded off.