JPS6141167Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a disk cartridge, and more specifically, to a joining structure of a pair of hubs that sandwich a disk rotatably set within a case body.

Conventionally, for example, in a magnetic disk cartridge, a magnetic disk 10 is used as shown in FIG.
Of the pair of upper and lower hubs 101 and 102 for holding the 0, the annular boss portion 103 formed on the main surface of the lower hub 102 is fitted into the central hole 104 of the upper hub 101. Tip surface and upper hub 10
Both the hubs 101 and 102 were joined by applying an adhesive M between the hubs 101 and 102.

In this way, using adhesive M, both hubs 101,
Both hubs 10 are not easy to work with since they are joined together, and there is also variation in the amount of adhesive M applied.
There were also variations in the bonding strength between the magnetic disks 1 and 102, and there was a fear that the adhesive M that had adhered to the magnetic disk 100 would protrude.

Therefore, the object of this invention is to provide a disk cartridge in which the above-mentioned upper and lower hubs are joined by ultrasonic means, thereby eliminating the drawbacks of the conventional disk cartridge.

An embodiment of this invention will be described below with reference to the drawings.

1 and 2 show an example of a disk cartridge according to this invention. In the figure, reference numeral 1 denotes a case body made of synthetic resin, and this case body 1 consists of an upper case 2 and a lower case 3 that are divided into two parts. These upper and lower cases 2 and 3 are joined together by, for example, ultrasonic welding means, with their peripheral walls 4 and 5 abutted against each other. 6 and 7 are the upper and lower cases 2,
For example, the welding part 7 of the lower case 3 is composed of a pin-shaped protrusion, and the corresponding welding part 7 of the upper case 2 is formed of a pin-shaped protrusion. The fitting part 6 is constituted by a recessed part, and a stepped part 8 is integrally formed on the inner wall of this recessed part 6, as shown in FIGS. 3A and 3B, which comes into contact with the tip of the projection 7. .

Near the front of the case body 1, through holes 9, 9 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). 1
0 is a sheet-shaped magnetic disk located concentrically with the through hole 9 and housed in the case body 1;
Reference numerals 1 and 12 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 10, and are formed in a substantially annular shape for reinforcing the upper and lower cases 2 and 3 and for reinforcing the setting area S of the magnetic disk 10. It serves the dual purpose of preventing dust from entering the area S. 13,1
Reference numeral 4 designates a pair of upper and lower hubs made of synthetic resin, which are joined together to sandwich the magnetic disk 10, and are rotatably fitted into the through hole 9. 1
Reference numerals 5, 16, and 17 are central holes formed in the magnetic disk 10, the upper hub 13, and the lower hub 14, respectively, and constitute an insertion hole for the main shaft portion _P1 of the drive shaft P. Corresponding to the fact that the drive shaft P has a locking shaft portion _P2 , the magnetic disk 10 and the upper hub 1
3 and the lower hub 14 have engagement holes 15a, 16a.
and 17a are formed, respectively. Of course,
The insertion holes 15, 16, 17 and the engagement holes 15a, 1
Depending on the type and shape of the drive shaft P, 6a and 17a can be configured with one engagement hole. Numeral 18 is a disk rotation stopper pin formed on the lower hub 14, and 19 is a small hole formed on the magnetic disk 10 to be engaged with the pin 18.

Of the two hubs 13 and 14, for example, an annular boss portion 14a is formed on the upper surface of the lower hub 14, and the annular boss portion 14a fits into the central hole 16 of the upper hub 13. As shown in Figures A and B, a stepped portion 20 for ultrasonic welding is integrally formed, and the central hole 1 of the upper hub 13 opposite to this step portion 20 is formed integrally.
A welding resin reservoir groove 13a is formed at the lower end of the inner wall of 6.

21, 21 are magnetic head insertion windows located on the front side of the case body 1 (right side in FIG. 2) and formed in the disk setting area S;
The magnetic head H is formed of a long hole that does not hinder the movement of the magnetic head H which moves in the radial direction (in the direction of arrow a in FIGS. 1 and 2). Reference numerals 22 and 23 denote annular walls formed concentrically with the drive shaft entry holes 9 in the upper and lower cases 2 and 3, and 24 and 25 open and close the respective magnetic head insertion windows 21 and 21 in the upper and lower cases 2 and 3. This is a shutter member. These shutter members 24 and 25 are made of, for example, a synthetic resin or a metal plate as in this embodiment, and have fitting holes 26 and 27 formed at their base ends in the annular walls 22 and 23, respectively. By fitting them together, they can be rotated from the open position to the closed position. Reference numerals 28 and 29 denote the shutter members 24 and 25 formed on the upper and lower cases 2 and 3, respectively.
Each setting recess, 30, 31 is the upper and lower case 2,
3 is a selector indicating opening formed in the disk 10, 32 is an opening formed in the disk 10 corresponding to the indicating opening 30, 31, and 33, 34 is corresponding to the indicating opening 30, 31. This is a notch hole formed in the shutter members 24 and 25.

Reference numeral 35 designates a slider for opening and closing the shutter members 24 and 25, 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. Although it can be constructed from a flexible metal plate, it is preferable to use resin molding as in this embodiment from the viewpoint of ease of fitting with the case body 1 side and moldability. In particular, in this embodiment, only the tip side corresponding to the curved portion is molded thinly to facilitate curved deformation during sliding, so the wall thickness can be easily controlled by resin molding. .

The distal end portion 35a of the slider 35 has cutout engaging portions 36, 37 formed on its upper and lower end surfaces to engage with the respective free ends 24a, 25a of the pair of shutter members 24, 25 as shown in FIG. Further, at the tip of the slider 35, an outwardly tapered surface 38 is formed as shown in FIG. Reference numeral 39 denotes a spring hook protruding from the inner surface of the base end 35b of the slider 35.

40, 40 are sliding grooves into which the upper and lower edges of the slider 35 are fitted, and the shutter members 24, 25
A curved portion 40 that extends in an arc shape backward along the outer edge of the front side of the disk setting area S from a position forward in the closing direction of the stopper wall 41 in the closed position (see FIG. 6).
a, and a straight portion 40b extending from the curved portion 40a to the rear of the case body 1.

Reference numeral 42 denotes a return spring suspended between the slider 35 and the case body 1;
a is engaged with the spring hook 39 of the slider 35, and the other end 42b is engaged with the shutter member 24,
The spring 42 is located behind the base end of the slider 35 in the closed position of the slider 35, and is locked to a locking pin 43 that projects from, for example, the inner wall of the lower case 3. On the other hand, a spring force is applied in a direction to push the shutter members 24, 25 to the closed position. 44 is the slider 35 mentioned above.
This is a protrusion formed on the outer surface of the proximal end portion 35b of the holder for external operation.

Reference numerals 45 and 46 indicate reference pole insertion holes into which reference poles of a recording/reproducing device (not shown) are inserted, and are located at both ends in the case width direction on the front side of the case body 1, and are formed in the upper and lower cases 2 and 3, respectively. For example, one insertion hole 45 has a large diameter on the lower case 3 side and a small diameter on the upper case 2 side, and the other insertion hole 46 has the opposite configuration. 47 is an annular wall surrounding one insertion hole 45 and protruding from the inner wall of the lower case 3; 48 is an annular wall surrounding one insertion hole 45 and protruding from the inner wall of the upper case 2; Annular walls 47, 48
As shown in FIG. 7, they are formed at a height that is, for example, half the distance between the inner walls of the upper and lower cases 2 and 3, so that their end surfaces are joined to each other. 49
50 is an annular wall surrounding the other insertion hole 46 and protruding from the inner wall of the lower case 3; 50 is the other insertion hole 46;
This is an annular wall that surrounds the upper case 2 and projects from the inner wall of the upper case 2, and the end surfaces of these walls are joined to each other similarly to the above-mentioned one.

Reference numerals 51 and 52 denote first positioning recesses and protrusions that are formed on the inner walls of the upper and lower cases 2 and 3 in the vicinity of one of the insertion holes 45 and that fit into each other. The convex portion 52 is formed in a columnar shape corresponding to the cylindrical shape. Also in the vicinity of the other insertion hole 46, second positioning concave and convex portions 53 and 54 having the same configuration as the concave and convex portions 51 and 52 are formed on each inner wall of the upper cases 2 and 3. There is. A concave portion 55 is formed on the tip surface of each of the convex portions 52 and 54, and a protrusion 56 for ultrasonic welding is formed on the peripheral edge.
is formed (Fig. 8A, B).

57 and 58 are on the rear side of the case body 1,
A third member formed on the upper and lower cases 2 and 3 and fitted together
recesses and protrusions for positioning, and are set at positions equidistant from both the formation positions of the first recesses and projections 51 and 52 and the formation positions of the second recesses and projections 53 and 54. Here, it is formed into an elongated rectangular shape along the front-rear direction (direction of arrow a) (see FIG. 2).

Reference numerals 59 and 59 designate members for preventing erroneous erasure of recorded contents, and each member 59 and 59 is formed of, for example, a synthetic resin and is constituted by a U-shaped movable element having a pair of upper and lower elastic arms 60 and 61. A transmission hole 62 for recording prevention detection optical signals is provided near the front wall 1a, which constitutes a part of the peripheral walls 4 and 5 of the case body 1.
63 (Fig. 12) is selectively opened and closed. Reference numerals 64 and 65 designate guide recesses for guiding the movement of the movable elements 59 and 59 in the opening and closing direction (direction of arrow b) along the front wall 1a, and are formed in the inner walls of the upper and lower cases 2 and 3, respectively. ing. A pair of elastic arms 60, 61 of each movable element 59 has protrusions 66, 66 formed at their ends facing outward, and corresponding to the closed and open positions of the movable element 59, protrusions 66, 66 are formed at the tips of the pair of elastic arms 60, 61 of each movable element 59. As shown in FIGS. 9 and 10, moderation grooves 6 are formed in the bottom walls of the upper and lower guide recesses 64 and 65.
7 and 68 in a detachable manner. Reference numerals 69, 69 are operation windows formed in the front wall 1a for moving and operating the movers 59, 59 from the outside, and as shown in FIG.
9 and 69 project from the side surfaces of the movable element 59.

Next, the procedure for assembling the disk cartridge will be outlined.

First, each fitting hole 2 of the shutter members 24 and 25
6, 27, the annular walls 22, 2 of the upper and lower cases 2, 3
3, the projections 22a and 23a formed on the tip surfaces of the respective annular walls 22 and 23 are crushed while heating.
4, 25 to prevent it from coming off. Meanwhile, while placing the magnetic disk 10 on the upper surface of the lower hub 14,
After fitting the boss portion 14a of the lower hub 14 into the center hole 16 of the upper hub 13 as shown in FIG.
are ultrasonically fused as shown in Fig. 4B, and both hubs 1
After integrating the hubs 13 and 14 into a disk holding state, the blocks of the hubs 13 and 14 are attached to the lower case 3.
It is fitted and installed on the inner edge of the through hole 9.

On the other hand, each free end 2 of the shutter members 24, 25
Notch engaging portion 3 of slider 35 between 4a and 25a
6 and 37 as shown in Fig. 5,
This slider 35 is fitted into the sliding groove 40 of the lower case 3 while its tip side is curved,
Further, a return spring 42 is hung between the spring hook 39 of the slider 35 and the locking pin 43 of the lower case 3. In addition, the guide recess 6 in the lower case 3
Movers 59 and 59 are installed at 5 and 65, respectively.

Next, the first positioning concave and convex portions 5
1, 52, second positioning concave and convex portions 5
3, 54 and the third concave and convex portions 57, 58, the upper and lower cases 2, 3 are positioned with respect to each other, and after the fused parts 6, 7 for joining are fitted, the fused parts 6, 7 are fitted. For the attachment parts 6 and 7, Fig. 3A
While pressing the upper case 2 against the lower case 3, ultrasonic waves are applied to fuse them. At this time, the step part 8 of one fused part 6 is melted by ultrasonic waves and is welded to the tip of the other fused part 7, as shown in FIG. 3B, so that the upper and lower cases 2 and 3 are combined. Ru. If ultrasonic waves are applied to the first concave and convex portions 51, 52 and the second concave and convex portions 53, 54, each convex portion 52,
The protrusion 56 on the tip periphery of the tip 54 melts from the state shown in FIG. 8A to the state shown in FIG.
By fusing the upper and lower cases 2 and 3 together, the integration of the upper and lower cases 2 and 3 is strengthened.

The disk cartridge having the above configuration is used in the following manner.

First, when attempting to record, the transmission holes 62 and 63 of the optical signal for recording prevention detection are connected to the movers 59 and 59.
It is determined whether the movable element 5 is blocked or not.
If 9 and 59 are in the closed position shown by the solid line in Figure 10,
It is in a state where it can be recorded. On the other hand, if it is in the open position shown by the dashed line in FIG. 10, it is in a state where it cannot record.

Next, when the case main body 1 is inserted forward into a recording/reproducing device (not shown), the operated protrusion 4 of the slider 35 is moved along with this forward insertion operation.
4 is engaged with a member (not shown) on the apparatus side, the slider 35 moves rearward against the spring force of the return spring 42, and the shutter members 24, 35 move backward as shown by the solid line in FIG. 25 to the open position, and the head insertion windows 21, 21 and the selector display opening 30,
31 is released. By opening the head insertion window 21, the magnetic head H is placed opposite the magnetic disk 10, so that while the magnetic disk 10 is rotated by the drive shaft P that engages the hubs 13 and 14,
Recording on the disk 10 or recording on the disk 10
The recorded information can be reproduced.

When the case body 1 is pulled back from the device, the slider 35 moves forward under the spring force of the return spring 42 and rotates the shutter members 24 and 25 back to the closed position as shown by the chain line in FIG. The head insertion window 21 and the like are closed to prevent dust from adhering to the magnetic disk 10.

After recording information on the magnetic disk 10, if there is no need to rewrite the recorded information, move the mover 59 to the open position shown by the dashed line in FIG. Just leave it open.

Here, since the pair of upper and lower hubs 13 and 14 that sandwich the magnetic disk 10 are joined by ultrasonic welding means, the joining strength is increased compared to the conventional one. That is, since the step part 20 for ultrasonic welding is formed on the outer peripheral surface of the boss part 14a of the lower hub 14, the boss part 14a is connected to the center hole of the upper hub 13.
6, apply ultrasonic waves and apply a downward force while slightly moving the upper hub 13 in the horizontal direction relative to the lower hub 14. As shown in FIG. 4B, the stepped portion 20 As the melting progresses, the entire boss portion 14a comes to fit into the center hole 16. In other words, the fused portion of the step 20 for ultrasonic welding is fused over a wide range of the entire circumference of the inner peripheral surface 16a of the central hole 16, so that both hubs 13 and 14 are firmly joined. .

In particular, since ultrasonic welding means is used, workability is good and there is no possibility of variations in bonding strength.

Incidentally, the application of ultrasonic waves may be stopped at the same time as the ultrasonic welding to both hubs 13 and 14 is completed, but the application of ultrasonic waves may be stopped until the repulsive force of the melted step portion 20 is lost, that is, this It is best to apply the above-mentioned downward force until the part is completely solidified.
This can be said to be a preferable embodiment from the viewpoint of further strengthening the bonding force.

Note that even if the boss portion 14a is provided protrudingly toward the upper hub 13, the same effect as described above can be obtained.

As described above, this invention uses ultrasonic welding to join a pair of hubs that hold the disks together, so it is possible to create a magnetic disk cartridge that can strengthen the joining force and facilitate workability. can be provided.

[Brief explanation of the drawing]

Fig. 1 is an exploded perspective view showing an example of a magnetic disk cartridge to which the disk cartridge according to the invention is applied, Fig. 2 is a longitudinal sectional view of the same disk cartridge, and Fig. 3 A and B are views of the upper and lower cases, respectively. Cross-sectional views before and after fusion showing the fusion part,
4A and 4B are cross-sectional views showing the upper and lower hubs for holding the magnetic disk before and after connection, respectively. FIG. 5 is a perspective view showing the engagement structure between the shutter member and the slider, and FIG. 6 is the slider. An explanatory diagram of the tip of the
Figure 7 is a cross-sectional view showing the reference pole insertion hole, Figures 8A and B are cross-sectional views before and after fusion showing the positioning concave and convex portions, respectively, and Figure 9 is the movable element for preventing accidental erasure. 10 is a front sectional view showing the setting part of the movable element, Fig. 11 is a front view showing the operation window of the movable element, and Fig. 12 is an explanation of the operation of the shutter member. FIG. 13, which is a plan view of the lower case that also serves as the main body, is an explanatory diagram of a conventional example. 1...Case body, 10...Disk, 13...
... Upper hub, 14 ... Lower hub, 14a ... Annular boss portion, 16 ... Center hole, 20 ... Step portion for ultrasonic welding.

Claims (1)

[Scope of utility model registration request] A disk cartridge in which a disk rotatably set in a case body is held between a pair of upper and lower hubs made of synthetic resin, and of the above-mentioned hubs,
An annular boss part that fits inside the center hole of one hub is provided protruding from the main surface of the other hub, and during ultrasonic welding, it receives a pressing force from the one hub side and is attached to the inner peripheral surface of the center hole. A disk cartridge in which a welding stepped portion to be welded is formed on the outer peripheral surface of the boss portion.