JPH0214481A - Disk cartridge - Google Patents

Abstract

PURPOSE:To ensure the positioning at the front part of both half cases by setting the fitting accuracy of male/female bosses in each tightening position tightly front/left/right of both the half cases more than the fitting accuracy in each tightening position of backward/left/right. CONSTITUTION:A disk case 1 incorporating a disk 2 has a drive shaft insertion window 3 at nearly the middle and a head insertion window 4 in front respectively and the disk case consists of upper/lower half cases 1a, 1b tightened at two positions of front left/right and two positions at backward left/right in terms of sealing. Then the ruggedness fitting accuracy of the male/female bosses 15A, 15B at each tightening position f front left/tight of both the half cases 1a, 1b is set tightly more than the ruggedness fitting accuracy of the male/ female bosses 15A, 15B at each tightening position of backward left/right of both the half cases 1a, 1b. Thus, the covering of both the half cases 1a, 1b is facilitated and the positioning of the half cases 1a, 1b is ensured with high accuracy.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a disk cartridge in which a signal recording disk such as a magnetic disk or an optical disk is housed in a disk case, and the present invention relates to a disk cartridge in which a signal recording disk such as a magnetic disk or an optical disk is housed in a disk case. This is an improved structure.

[Conventional technology]

In the present invention, as shown in FIG. 1, a flat hard disk case 1 containing a built-in disk 2 is made up of upper and lower half cases 1a and 1b joined together in a lid-to-bottom manner. A disk cartridge having a drive shaft insertion window 3 and a head insertion window 4 in front of the drive shaft insertion window 3 is known.

It is also known that this type of half case Ia-1b is fastened by ultrasonic welding or tufting screws on the front left and right sides and the rear left and right sides.

[Problem to be solved by the invention]

Since such a disk cartridge has a head insertion window 4 at the front, it is important that the two half cases 1a-1b, especially the front portions, are fastened together without misalignment. Therefore, in order to ensure the positioning state, a male boss is provided protruding from one side of the two half cases 1a and 1b, and a female boss is provided protruding from the other side.

It is conceivable to fit these male and female bosses in a concave-convex manner.

However, in the past, even though the above-mentioned fastening points were to be fitted in concave and convex shapes, the only thing that was in mind was to make the fitting accuracy uniform throughout. Therefore, if the fitting accuracy is poor, 1 car half case 1
Although the lid matching work of a and 1b (assembling workability) is improved, positioning accuracy is still not achieved. On the other hand, if the overall fitting accuracy is made stricter, the workability of one assembly becomes worse. I had no choice but to fall into a dilemma.

From this point of view, the present invention provides a disk cartridge in which the fastening points of both half cases are improved, workability is ensured during assembly, and positioning of both half cases can be reliably performed at the front.

[Means to solve the problem]

According to the present invention, a disk case 1 containing a disk 2 has a drive shaft insertion window 3 approximately in the center and a head insertion window 4 in front of the drive shaft insertion window 3, and the disk case 1 has two locations in the front left and right and rear left and right locations. In a disc cartridge consisting of upper and lower half cases 1a and 1b that are fastened together in two places, the fitting accuracy of the male and female bosses 15A and 15B at the front left and right fastening points of each half case 1a and 1b is as follows. i male boss 1 at each fastening point on the left and right
It is characterized in that the dimensions are set more closely than the concavity and convex fitting precision of 6A and 16B.

[Effect]

When assembling, the disk 2 is attached to the lower half case 1b, and then the upper half case 1a is placed over the lower half case 1b. At that time, as long as the male and female bosses 15A and 15B of both half cases 1a and Ib at the front left and right fastening points are fitted, the fitting accuracy of the corresponding female and male bosses 15A and 15B is set strictly, so one car half case The positioning of 1a and 1b can be ensured, and the male and female 16A and 16B can be easily fitted as they are at the rear left and right fastening points where fitting accuracy is poor. After that, each fastening location is fastened by ultrasonic welding or screws.

〔Effect of the invention〕

According to the present invention, both half cases 1a
While the work of fitting the lids of the disk case 1b becomes dramatically easier, positioning of the half cases 1a and 1b at the important front part of the disk case 1 can be ensured with high precision.

〔Example〕

Hereinafter, the details will be explained based on the drawings. FIGS. 1 to 7 show a first embodiment of the disc cartridge according to the present invention, which consists of a rectangular flat hard disc case 1 and the disc case. 1 and a (magnetic) disk 2 rotatably installed inside the disk.

The disk case 1 is made up of upper and lower half cases 1a and 1b that are fastened together at four points at the four corners in a lid-like manner.

A drive shaft insertion window 3 is formed in the center of the dome, and a head insertion window 4 is formed in front of the drive shaft insertion window 3 in a vertically penetrating shape.

The disk 2 is a disc-shaped recording sheet (magnetic recording sheet) 5
and a hub 6 integrally connected to the center of the seat 5 and facing the drive shaft insertion window 3.

When the disk cartridge is loaded into the disk drive in this way, the hub 6 is chucked by a member on the disk drive side through the drive shaft insertion window 3, the disk 2 rotates, and the nonwoven fabric attached to each inner surface of the upper and lower half cases 1a and 1b is rotated. It has a basic structure in which liners 8 come into sliding contact with the recording sheet 5 for cleaning.

Each of the half cases 1a and 1b shown in the figure is formed in exactly the same shape, and the rear end side is formed to project symmetrically through step portions 10 provided on both left and right sides, and the disk case 1
The left and right width dimensions of the disc cartridge are not the same across the front and back, but are asymmetrical in that they become wider at the rear end to prevent the disc cartridge from being loaded into the disc drive in the wrong orientation.

Each half case 1a, 1b has a wall 11 erected on the outer periphery,
An inner wall 13 is provided in a divided manner to partition the four corners of the outer circumferential wall 11 to form a substantially circular disk storage chamber 12, and the upper and lower half-cases 1a and 1b have an outer periphery set flush with each other. The end faces of the wall 11 and the inner wall 13 are butted against each other.

In each half case la/1b, disk storage chamber 1
A circular drive shaft insertion window 3 is transparently provided in the center of the drive shaft 2, and at the left and right center in front of this drive shaft insertion window 3.

A head insertion window 4 facing forward and backward with a long rope is transparently provided. The left and right opening edges of the head insertion window 4 are parallel, and a virtual center line P passing through the center of the drive shaft insertion window 3 and perpendicular to the front edge of the case divides the head insertion window 4 into left and right halves.

That is, a circular drive shaft insertion window 3 and a rectangular head insertion window 4 whose left and right widths are smaller than the diameter of the drive shaft insertion window 3 are 1! Since the front edge of the head insertion window 4 extends to the inner end of the outer circumferential wall 11, a large movement stroke in the radial direction of the head can be taken, and the movement of the head to the disk 2 is correspondingly large. The amount of recording can be increased. In addition,
The drive shaft insertion window 3 only needs to be located in the center of the left and right sides, and does not need to be located in the center of the front and back.

In the four corner sections surrounded by the outer peripheral wall 11 and the inner wall 13, there are bosses 15 for fastening the upper and lower half cases 1a and 1b.
It has A, 15B, 16A, and 16B. Among these, a set of bosses 15A and 15B at the front left and right fastening points,
A set of bosses 16A and 16B at the rear left and right fastening points
are paired with each other.

That is, in FIGS. 2 and 3, the front boss 15A
・Among 15B, the left male boss 15A is half case 1
It projects from the inner surface of a (lb) in a cylindrical shape higher than the lid mating surface of the outer peripheral wall 11, and its tip is formed in a tapered shape with an outwardly expanding tapered surface 17 on the inner surface. Further, the female boss 15B on the front right side is the male boss 1 of the other half case.
5A is formed into a cylindrical shape having a recessed hole 19 into which it can be tightly fitted, and its tip end surface is flush with the lid mating surface of the outer periphery W11. The centers of these bosses 15A and 15B are located symmetrically on the left and right with the virtual center line P as an axis of symmetry.

In FIGS. 2 and 4, rear bosses 16A and 16
Similar to the front bosses 15A and 15B, B is also provided so that its center is located symmetrically on the left and right with the virtual center line P as the axis of symmetry, and the female boss 16A on the left side is located on the front side with the recessed hole 19. The right female boss 15B is formed in substantially the same shape, and the right male boss 16B is formed in substantially the same shape as the front left male boss 15A having a tapered surface 17.

However, in the upper and lower half cases 1a and 1b, the accuracy of the uneven fitting of the male and female posts 15A and 15B on the front side is as follows.

The dimensions are set more closely than the fitting accuracy of the concavity and convexity of the male and female bosses 16A and 16B on the rear side.

There is a small rectangular section 2 in the right corner where the front female boss 15B is located.
0A is provided, and the inner court thereof is hollowed out in a U-shape to form an accidental erasure prevention piece 21, and the accidental erasure prevention piece 21 is formed as shown in FIG.
A groove 22 is cut into the inner surface of the proximal end to facilitate tearing off. Corresponding to this accidental erasure prevention piece 21, the left male boss 15
A rectangular small section 20B is provided at the corner of the section A, and the entire inner bottom thereof is transparent to form an operation window 23 for breaking off the erroneous erasure prevention piece 21.

In FIG. 1, reference numeral 25 indicates each half case 1a, 1b.
In FIG. 2, reference numeral 26 indicates the gate position when injection molding the half case 1a (lb).

Next, to explain the procedure for assembly, as shown by the imaginary line in FIG. It is attached by heat welding, ultrasonic welding, or gluing.

When the disk 2 is mounted in the disk storage chamber 12 surrounded by the inner wall 13 of the lower half case 1b in this state, the hub 6 faces the drive shaft insertion window 3 so as to partially fit therein. At this time, the inner wall 13 functions as a guide for mounting the disc 2, and when one assembly is installed, the disc 2
It also prevents the contact from shifting significantly.

Next, the upper half case 1a, to which the nonwoven fabric liner 8 has been fixed in advance, is placed over the lower half case lb in a lid-fitting manner. First, each half case 1 that forms a pair on the front side
Positioning is performed by fitting the male and female bosses 15A and 15B of a and 1b in a concave and convex manner.

Subsequently, the female and male bosses 16A and 16B of each half case 1a and 1b forming a pair on the rear side are fitted into each other.

The bosses 15A, 15B, 16A, and 16B that form a pair on the front or rear side of each half case 1a, 1b are symmetrical with respect to the virtual center line P, and the outer peripheral wall 11, inner wall 13, etc. are also in a similar relationship. The disk case 1 can be constructed by combining half cases 1a and 1b having exactly the same shape.

The fitting accuracy of the rear bosses 16A and 16B is the same as that of the front boss 1.
The fitting accuracy is set looser than that of 5A and 15B,
Furthermore, since the unevenness of the bosses 16A and 16B on the rear side is set in the opposite left and right from that on the front side, the half case 1a
・There is no assembly interference between the front and rear of 1b, and both can be smoothly and accurately positioned and overlapped.

In particular, the bosses 15A and 15B on the front side are set to fit tightly together, so it is ensured that misalignment at the front of both half cases 1a and 1b, which is a particular problem due to the presence of the head insertion window 4, is ensured. can be regulated.

In this way, when the nine half cases 1a and 1b are stacked on top of each other, before the outer peripheral wall 11 and inner wall 13 completely butt each other,
The protruding ends of the male bosses 15A and 16B of the upper half case 1a are connected to the recessed holes 19 of the female bosses 15B and 16A of the lower half case 1b.
It hits the inner base first. From this state, each weld location is integrally joined by ultrasonic welding under pressure. At this time, female boss 15
Male boss 15A/16B that hits the inner bottom of B/16A
Since the tip is formed in a tapered shape with tapered surfaces 1 and 7 on the inner surface, the tip can be melted easily and the welding process can be carried out smoothly in a short time. Moreover, each male boss 15A
A part of the welding margin of the tapered tip of 16B also wraps around the protruding base end of each female boss 15B and 16A, improving welding strength.

In the state where the upper and lower half cases 1a and 1b are completely welded together as described above, the end surfaces of the upper and lower outer peripheral walls 11 and inner walls 13 are butted against each other and are in close contact with each other.

Note that during ultrasonic welding using a horn, powder comes out from the welded area, but this powder is blocked by the inner wall 13 and is not allowed to flow into the disk storage chamber 1.
2, and is effective in preventing dropouts. In addition, the upper and lower half cases 1a and 1 that have come off the welding point
If there is an abutment part in a part of the lid mating surface b, specifically in the vicinity of the welding part of the outer peripheral wall 11, welding will occur in that part as well, resulting in cracks. Therefore, as shown in FIG. 6, the outer circumferential wall 11 is made higher on the inside and a stepped surface 27 is formed on the outside to release welding burrs and allow the two half cases 1a and 1b to come into close contact with each other at the lid mating surfaces. In the illustrated example, the stepped surface 27 is formed around the left, right, and front sides of the outer peripheral wall 11, and is formed only in the vicinity of the bosses 16A and 16B on the rear side. It is necessary and sufficient to provide the falling surfaces 27 at the four corners of the outer peripheral wall 11 near each boss.

[Another example]

In the illustrated example, the left-right distance between the front male and female bosses 15A and 15B is different from the left-right distance between the rear female and male bosses 16A and 16B, and the half cases 1a and 1b, which have the same top and bottom shapes, are mistakenly turned in the front and back directions. However, this point is not necessarily limited.

Further, as shown in FIG. 8, the relationship between the convex and concave portions of the rear bosses 16A and 16B may be the same on the left and right sides as that of the front bosses 15A and 15B. In other words, the front and rear pairs of bosses (15A, 15B and 16A, 16B) may have different shapes and fitting forms as long as they are in a concave-convex fitting relationship.

Further, as shown in FIG. 9, rib-shaped positioning protrusions 28 and positioning grooves 29 into which the protrusions engage are formed near the front bosses 15A and 15B, respectively.

By fitting these two members 28 and 29 into convexes and convexes, it is possible to more reliably position the upper and lower half cases 1a and 1b, especially the front parts.

Note that in the present invention, the disc 2 may be an optical disc, or
Needless to say, disk cartridges equipped with shutters for opening and closing the head insertion window 4 are also applicable.

[Brief explanation of the drawing]

1 to 7 show a first embodiment of a disk cartridge according to the present invention. FIG. 1 is an exploded perspective view. FIG. 2 is a plan view of a half case that constitutes a disk case. FIG. 3 is a sectional view taken along line A-A in FIG. 2. FIG. 4 is a sectional view taken along line B-B in FIG. 2. FIG. 5 is a sectional view taken along the line CC in FIG. 2. FIG. 6 is a partially enlarged side view of both half cases assembled. Figure 7 shows A-A in Figure 2 of the disk cartridge.
FIG. 3 is a cross-sectional view at a position corresponding to the line. FIG. 8 is a plan view of a half case showing another embodiment of the present invention. FIG. 9 is a plan view of essential parts showing still another embodiment of the present invention. 1... Disc case. 1a, 1b...Half case. 2...Disk. 3...Drive shaft insertion window. 4...Head insertion window. 11...Outer peripheral wall. 12... Disk storage chamber. 13...Inner wall. 15A/15B...Front boss. 16A/16B...Boss on the back side. 17...Theban surface. Patent applicant Hitachi Maxell Co., Ltd.
Mitsumi Electric Co., Ltd.

Claims (1)

[Claims] (1) The disk case 1 that houses the disk 2 has a drive shaft insertion window 3 approximately in the center and a head insertion window 4 in front of this. Consisting of upper and lower half cases 1a and 1b that are fastened together in two places on the left and right, the fitting accuracy of the female and male bosses 15A and 15B at the front left and right fastening points of both half cases 1a and 1b is A disk cartridge characterized in that dimensions are set more closely than the fitting accuracy of the concaves and convexities of the male and female bosses 16A and 16B at each fastening location.