JPS6141185Y2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to a disk cartridge that constructs a case body by combining upper and lower case halves using ultrasonic fusing means.The purpose of this invention is to combine the upper and lower cases into one. It is an object of the present invention to provide a disk cartridge in which ultrasonic welding can be performed accurately by positioning at three points without causing relative displacement of both cases.

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 ultrasonic welding means with their peripheral walls 4 and 5 abutted against each other. Reference numerals 6 and 7 indicate a plurality of welded parts for joining provided on the peripheral walls 4 and 5 of the upper and lower cases 2 and 3. For example, the welded part 7 of the lower case 3 is composed of pin-shaped projections, and The corresponding welded part 6 of the upper case 2 is composed of a recessed part, and this recessed part 6
As shown in FIGS. 3A and 3B, a stepped portion 8 that comes into contact with the tip of the protrusion 7 is integrally formed on the inner wall of the holder.

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 molten 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 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 denotes 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 cutout 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 protrusion 56 for ultrasonic welding of the peripheral edge portion is formed by forming a recessed portion 55 on the distal end surface of each of the convex portions 52 and 54 (FIGS. 8A and 8B).

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 made of, for example, synthetic resin and is comprised of a U-shaped movable element having a pair of upper and lower elastic arms 60 and 61. , a recording prevention detection optical signal transmission hole 62 provided near the front wall 1a that 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. At the tips of each pair of elastic arms 60 and 61 of each movable element 59, protrusions 66 and 66 facing outward are formed. As shown in Fig. 10, the upper and lower guide recesses 6
Moderation groove 6 formed on each bottom wall of 4 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. First concave and convex portions 51, 52 and second concave portions 53, 5
If ultrasonic waves are also applied to 4, the protrusions 56 on the tip periphery of each convex portion 52, 54 will melt from the state shown in FIG. 8A to the state shown in FIG. , 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, when the upper case 2 and lower case 3 are combined by ultrasonic welding means, it is necessary to minimize relative positional deviation between the two cases 2 and 3.

Therefore, in the above configuration, the first concave and convex portions 5
1, 52 and the second concave portion, and convex portions 53, 54 and the third concave portion.
Both cases 2,
3. Misalignment can be prevented. That is, the first concave and convex portions 51 and 52 and the second concave and convex portion 5
Two points 3 and 54 first suppress relative positional displacement in the front-back direction (direction of arrow a). Even if these first concave and convex portions 51, 52 and the second
Even if the fitting accuracy of the concave and convex portions 53 and 54 is low and relative positional deviation occurs in the left-right direction (arrow b direction), the third concave and convex portions located on the rear side of the case body 1 The convex portions 57 and 58 can prevent the positional shift in the left and right direction, resulting in high positioning accuracy.

By the way, the first concave and convex portions 51 and 52
In addition, after the second concave and convex portions 53 and 54 are fitted together, they are ultrasonically fused as in this embodiment in order to help prevent the upper and lower cases 2 and 3 from wobbling. However, it is preferable that the third concave and convex portions 57 and 58 serve the purpose of preventing displacement in the left and right direction, as in this embodiment. In other words, the third concave and convex portions 5
Similarly to the first concave and convex portions 51 and 52, the shapes 7 and 58 can also be shaped to allow ultrasonic fusion, but they are formed in a rectangular shape along the front-rear direction as in this embodiment. As a result, when the distance between the first and second concave and convex formation positions and the third concavity and convexity formation position becomes long, such as in a large case, horizontal positioning is likely to occur. However, the positional shift can be effectively suppressed by the lengths of the third concave and convex portions in the front-rear direction.

As described above, this invention is structured so that the upper case and lower case, which are joined together by ultrasonic welding, are positioned at three points, which causes a relative positional shift between the upper case and the lower case. These two cases can be combined without any problems.

[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,
Figures 4A and 4B are sectional views showing the upper and lower hubs for holding magnetic disks before and after combination, respectively;
The figure is a perspective view showing the engagement structure between the shutter member and the slider, Figure 6 is an explanatory view of the tip of the slider, Figure 7 is a sectional view showing the reference pole insertion hole, and Figures 8A and B are positioning diagrams. 9 is an enlarged plan view of the lower case showing the setting portion of the mover for preventing accidental erasure, and FIG. 10 is a cross-sectional view showing the setting portion of the mover for preventing accidental erasure. 11 is a front view showing the operation window of the movable member, and FIG. 12 is a plan view of the lower case, which also serves to explain the operation of the shutter member. 1... Case body, 2... Upper case, 3... Lower case, 6, 7... Ultrasonic fusion part, 51, 52...
...first recesses and protrusions, 53, 54...second recesses and protrusions, 57, 58...third recesses and protrusions.

Claims (1)

[Scope of utility model registration request] It is a disk cartridge that constitutes a case main body by combining upper and lower cases into two halves using ultrasonic welding means, and is formed on the inner wall of one of the upper and lower cases and on the inner wall of the other case. A first recess and a convex portion and a second recess and a convex portion that fit into the case body are respectively arranged on both sides of the case width direction on the front side of the case body, and are fitted into each other,
A disk cartridge comprising: a third concave and convex portion for relative positioning of the upper and lower cases together with the first concave and convex portion and the second concave and convex portion; and a third concave and convex portion disposed on the rear side of the case body.