JPH0798954A - Cassette for recording and reproducing - Google Patents

Abstract

PURPOSE:To perform excellent recording and reading, and also to prevent yield from being lowered. CONSTITUTION:An inner rib 25 having a protruding part 25a is provided on an upper shell 22, and an outer rib 27 and a recessed groove 28 are provided on a lower shell 23. Therefore, synthetic resin powder on the upper and lower shells 22 and 23 produced at welding point stays inside the outer rib 27, and does not scatter outside the outer rib 27; so that the synthetic resin powder does not adhere to a recording medium and spacing loss can be prevented from occurring. Since the respective shells 22 and 23 are not welded in a state where the fitting positions of the respective shells 22 and 23 are shifted, a gap between both shells 22 and 23 is not formed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a recording / reproducing cassette suitable for use in a data disk cassette such as a 3.5-inch micro-floppy disk cassette.

[0002]

2. Description of the Related Art Disk devices such as floppy disk devices are widely used in office computers, word processors, etc., including personal computers, and their spread is remarkable.

On the other hand, various types of floppy disks have been developed as recording media used in this type of disk device.

Conventionally, this type of floppy disk is
It is widely used as a recording / reproducing cassette, and is configured as shown in FIGS. 5 and 6A and 6B.

This will be described with reference to FIG. 1. In FIG. 1, reference numeral 1 is a cassette housing for a floppy disk, and two upper and lower parts are fitted to each other and joined by ultrasonic welding or the like. It is composed of shells 2 and 3, and is entirely formed of a synthetic resin such as ABS.

Of the shells 2 and 3 of the cassette housing 1, the upper shell 2 is formed by a shell having a circular recess 2a opening downward and having a rectangular shape in plan view.

A through window 4 for inserting a magnetic head, which opens inside and outside of the concave portion 2a, is formed at a substantially central portion of one end edge of the shell 2.
Are provided, and the cylindrical first ribs 5 having the convex portions 5a projecting from the rib tip surfaces and opening downward are integrally provided at the four corners.

A center plate 6 facing the inside of the recess 2a is bonded to the center of the shell 2.

On the other hand, the lower shell 3 is formed of a shell having a circular recess 3a opening upward and having an angular shape in plan view.

A through window 7 for inserting a magnetic head, which opens inside and outside the concave portion 3a, is formed at the substantially central portion of one edge of the shell 3.
And cylindrical second ribs 8 having a tip surface 8a with which the convex portion 5a abuts in the shell fitted state are integrally provided at the four corners.

A central hole 9 is formed in the center of the shell 3 so as to open inside and outside of the recess 3a like the through window 7.
Is provided.

A floppy disk 10 as a recording medium is rotatably housed in the circular recesses 2a, 3a of the shells 2, 3 and is entirely formed by an annular magnetic sheet.

On the inner peripheral edge of the floppy disk 10, a center core 11 for mounting a disk table which is loosely fitted in the central hole 9 is fixed.

Reference numerals 12 and 13 denote substantially horseshoe-shaped disc cleaning sheets, the inner and outer peripheral edge portions of which are attached to the shells 2 and 3 by heat fusion or the like, and the through holes 4 and 7 and the central hole. 9 and the center plate 6
Except that the upper and lower surfaces of the floppy disk 10 are covered.

Both of these disc cleaning sheets 1
As the fibers 2 and 13, a non-woven fabric is used in which short fibers such as polyester, polypropylene, or synthetic resin such as rayon are mixed alone or in an appropriate ratio and bonded by a binder or heat fusion.

Reference numeral 14 is a lifter for pressing both of the disk cleaning sheets 12 and 13 against the upper and lower surfaces of the floppy disk 10, and is mounted in the recess 3a of the shell 3 by heat fusion or the like, and the whole is, for example. It is made of an elastic material such as PET (polyethylene terephthalate) or a stainless thin plate.

Reference numeral 15 denotes a shutter which faces the edges of the shells 2 and 3 and is attached to the central portion of the edge of the cassette housing 1 so as to be able to move forward and backward.
Is configured to open and close the opening.

In order to assemble the cassette housing of the recording / reproducing cassette having the above-mentioned structure, the projection 5a of the first rib 5 is brought into contact with the tip end surface 8a of the second rib 8 and positioned, and then both This is performed by fixing the ribs 5 and 8 with an ultrasonic welding machine (not shown).

[0019]

By the way, in the conventional recording / reproducing cassette, the welding of the upper and lower shells 2 and 3 causes the convex portion 5a of the first rib 5 to abut on the tip surface 8a of the second rib 8. Therefore, synthetic resin powder (wear powder) of the upper and lower shells 2 and 3 is generated and scattered in the cassette housing 1 at each welding point. As a result, there is a problem that the synthetic resin powder adheres to the floppy disk 10 to cause a spacing loss, which makes it impossible to record or read a signal.

Further, since the tip surface 8a of the second rib 8 with which the convex portion 5a of the first rib 5 abuts is a flat surface, the upper and lower shells 2 and 3 are fitted to each other when the ribs 5 and 8 are positioned. However, in the worst case, a gap is formed between the upper and lower shells 2 and 3, which causes a decrease in yield.

The present invention has been made in view of the above circumstances, and provides a recording / reproducing cassette capable of excellent recording / reading of a signal and preventing a decrease in yield. is there.

[0022]

In the recording / reproducing cassette according to the present invention, one of the two shells is formed by a shell having a cylindrical outer rib protruding into the cassette housing, and the other shell is formed. The shell is formed by a shell having an inner rib that fits into the outer rib, and the welding protrusion protruding into the outer rib and the protrusion between the inner rib of the other shell and the one shell are positioned. A possible recess is provided.

[0023]

In the present invention, the synthetic resin powder generated at each welding point between the two shells does not stop inside the outer rib and scatter outside the outer rib.

[0024]

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

1 (A) and 1 (B) are perspective views and sectional views showing a main part of a recording / reproducing cassette according to the present invention, and FIG. Enlarged sectional views, FIGS. 3A and 3B are a bottom view showing an upper shell and a plan view showing a lower shell of the recording / reproducing cassette according to the present invention, and FIG. 5 and FIG. The same or equivalent members as in A) and (B) are designated by the same reference numerals, and detailed description thereof will be omitted.

In the figure, the reference numeral 21 designates a cassette housing for a floppy disk, which is composed of upper and lower two shells 22 and 23 which are fitted with each other and joined by ultrasonic welding or the like. Cassette housing 1
Similarly to the above, it is formed of a synthetic resin such as ABS.

Upper and lower shells 2 of this cassette housing 21
The upper shell 22 of the reference numerals 2 and 23 is formed of a shell having a circular recess 22a opening downward and having a rectangular shape in plan view.

A through window 24 for inserting a magnetic head, which opens inside and outside the circular recess 22a, is provided at the substantially central portion of one end edge of the shell 22, and the rib height dimension and the rib height dimension are provided at each of the four corners. The outer diameters of the ribs are set to L ₁ and D ₁ , respectively, and cylindrical inner ribs 25 opening downward are integrally provided.

Each inner rib 25 of the shell 22 is integrally provided with a convex portion 25a for welding, which protrudes from the tip of the rib.

The convex portion 25a of each of the inner ribs 25 is formed by an annular convex portion having a substantially triangular cross-section as seen from the bottom portion toward the tip portion, and the bottom portion has dimensions and volumes of a and A, respectively. Is set to.

On the other hand, the lower shell 23 is formed by a shell having a circular recess 23a opening upward and having an angular shape in plan view.

A through window 26 for inserting a magnetic head, which opens inside and outside the circular recess 23a, is provided at a substantially central portion on one side edge of the shell 23, and the four outer corners are provided outside the inner rib 25. The rib height dimension L ₂ and the rib inner diameter D ₂ are smaller than the inner rib height dimension L ₁ (L ₁ ≧ L ₂ ) and larger than the inner rib outer diameter D ₁ (D ₁ <D A cylindrical outer rib 27 which is set to ₂ ) and opens upward is integrally provided.

The shell 23 is provided with an annular groove 28 that opens into the outer rib 27 and can position the positioning portion 25a of the inner rib 25.

Each of these grooves 28 is formed by a groove having a substantially triangular cross section as it extends from the groove bottom toward the opening.

The opening groove width b of each groove 28 is set to be larger than the bottom dimension a of the convex portion 25a (a≤b), and the groove volume B is smaller than the volume A of the convex portion 25a. It is set to (A ≧ B).

In order to assemble the cassette housing 21 in the recording / reproducing cassette thus constructed, first the inner rib 25 is fitted in the outer rib 27, and then the inner rib 25 is fitted in the groove 28 of the shell 23. Convex part 25
Then, the upper and lower shells 22 and 23 are mutually attached by an ultrasonic welding machine (not shown) at each welding point (between the convex portion 25a of the inner rib 25 and the groove bottom of the concave groove 28). It is performed by welding.

At this time, the synthetic resin powder generated at each welding point between the shells 22 and 23 does not stay inside the outer rib 27 and scatter outside the outer rib 27.

Therefore, in this embodiment, since the synthetic resin powder of the upper and lower shells 22 and 23 does not adhere to the recording medium (floppy disk), the spacing loss can be prevented.

Further, in the present embodiment, the convex portion 25a can be positioned in the concave groove 28 because the upper and lower shells 22 and 23 are not welded as they are without shifting the fitting positions from each other as in the conventional case. No gap is formed between the upper and lower shells 22 and 23.

Further, in the present embodiment, the height dimension of the outer rib 27 is set not larger than the height dimension of the inner rib 25 in order to secure the entire convex portion 25a as a convex portion for welding. You can

In addition, in the present embodiment, the volume of the concave groove 28 is set to be smaller than the volume of the convex portion 25a. This means that the convex portion 25a faces the concave groove 28 and each shell 2 is exposed.
2, 23 can be melted.

In the present embodiment, an example is shown in which only the welding points near the write protect among all the welding points are surrounded, but the present invention is not limited to this, and FIG. , (B), other welding points may be surrounded by the ribs 31 to 36. In this case, it is possible to reliably prevent the synthetic resin powder from adhering to the floppy disk 10.

Further, in the present embodiment, the case where there are four welding points is shown, but the present invention is the cassette housing 2.
It can be changed as appropriate according to conditions such as the size and shape of unit 1.

Furthermore, in this embodiment, the inner shell 25 and the convex portion 25a are provided on the upper shell 22, and the outer shell 27 and the concave groove 28 are provided on the lower shell 23. Of course, the outer rib and the concave groove may be provided in the upper shell, and the inner rib and the convex portion may be provided in the lower shell.

Furthermore, in this embodiment, the inner rib 25 is provided with a convex portion 25a, and the convex portion 25a is formed.
Although the case where the concave groove 28 capable of positioning a is provided in the shell 27 on the outer rib side is shown, the convex portion for welding is provided on the shell on the outer rib side, and the concave groove capable of positioning the convex portion is formed in the inner rib. The same effect as that of the embodiment can be obtained even if it is provided.

Besides, in the present embodiment, the one provided with the shell for accommodating the floppy disk as the recording medium is shown, but the present invention is not limited to this, and the shell for accommodating another disk is provided. The thing or the thing provided with the shell which accommodates a tape is applicable similarly to an Example.

[0047]

As described above, according to the present invention, 2
One of the two shells is formed by a shell having a cylindrical outer rib protruding into the cassette housing, and the other shell is formed by a shell having an inner rib fitted to the outer rib. Since the convex portion protruding into the outer rib and the concave portion capable of positioning the convex portion are provided between the inner rib of one shell and one shell, the synthetic resin powder generated at each welding point between both shells is It does not stop inside the ribs and scatter outside the outer ribs.

Therefore, since the synthetic resin powder does not adhere to the recording medium, it is possible to prevent the occurrence of spacing loss, and it is possible to perform good recording or reading.

The ability to position the protrusion in the recess does not cause the shells to be welded as they are by shifting the fitting positions from each other as in the prior art, so that no gap is formed between the shells and the yield is improved. It is possible to prevent the decrease.

In the second aspect, the height dimension of the outer rib is set to a dimension not larger than the height dimension of the inner rib, because the entire convex portion can be secured as the convex portion for welding, which is preferable. Welding can be performed.

In the fourth aspect, the inner volume of the concave portion is set to be smaller than the volume of the convex portion, so that the convex portion can be faced in the concave portion to melt each shell, so that defective welding is caused. Can be prevented.

[Brief description of drawings]

1A and 1B are a perspective view and a cross-sectional view showing a main part of a recording / reproducing cassette according to the present invention.

FIG. 2 is an enlarged sectional view showing a positioning portion of a welding point of the recording / reproducing cassette according to the present invention.

3A and 3B are a bottom view showing an upper shell and a plan view showing a lower shell of a recording / reproducing cassette according to the present invention.

4A and 4B are a bottom view showing an upper shell and a plan view showing a lower shell in another embodiment.

FIG. 5 is an exploded perspective view showing a conventional recording / reproducing cassette.

6A and 6B are a perspective view and a cross-sectional view showing a welding point of a conventional recording / reproducing cassette.

[Explanation of symbols]

 21 ... Cassette housing 22 ... Upper shell 23 ... Lower shell 25 ... Inner rib 25a ... Convex portion 27 ... Outer rib 28 ... Recessed groove

Claims (4)

[Claims] 1. A cassette housing comprising two shells,
In a recording / reproducing cassette including a recording medium housed in the cassette housing, one of the shells is formed by a shell having a cylindrical outer rib protruding into the cassette housing, The other shell is formed by a shell having an inner rib that fits inside the outer rib, and a welding projection that protrudes into the outer rib between the inner rib of the shell and the one shell, and A recording / reproducing cassette, which is provided with a concave portion capable of positioning the convex portion. 2. The recording / reproducing cassette according to claim 1, wherein a height dimension of the outer rib is set to a dimension not larger than a height dimension of the inner rib. 3. The recording / reproducing cassette according to claim 1, wherein the concave portion is provided on the shell on the outer rib side, and the convex portion is provided on a front end surface of the inner rib. 4. The recording / reproducing cassette according to claim 1, wherein the volume of the convex portion and the volume of the concave portion are set to the same size.