JPS6141182Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a disk cartridge whose case body, which consists of an upper and lower case body, is molded from synthetic resin.

Generally, in a disk cartridge, such as a magnetic disk cartridge, a magnetic head insertion window is formed in each of the upper and lower halves of the synthetic resin case body, and each magnetic head insertion window can be opened and closed using a shutter member. It is blocked.

By the way, both the upper and lower cases above are the 14th cases.
Molding is performed using an upper mold M and a lower mold N as shown in the figure, but in the conventional case 101, the head insertion window 102 is located at the joint surface of both molds MN.
The surface 103 of the portion corresponding to the insertion window 102 was set at the same level as the opening end surface of the insertion window 102 on the case inner wall side. That is, in the conventional case, the marks of the joining surface 103 and the burrs 1 are formed on the opening end surface of the head insertion window 102 on the inner wall side of the case as shown in FIG.
04, which will appear as a scar, and if this is bent inward during the assembly process etc., there is a risk that the opening/closing movement of the shutter member 105 will be hindered.

Therefore, this invention allows the presence of bonding surface traces of the molding die within the inner wall surface of the magnetic head insertion window, thereby preventing the opening and closing movement of the shutter member regardless of whether or not the bonding surface traces appear as burrs. The object of the present invention is to provide a disk cartridge that can maintain smooth operation.

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 composed of a recessed part, and the inner wall of the recessed part 6 is integrally formed with a stepped part 8 that comes into contact with the tip of the projection 7, as shown in FIGS. 3A and 3B.

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 denotes 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). As shown in FIG. 5, on the inner wall surface of each of the head insertion windows 21, there are bonding surface traces 210a and 210b of a pair of upper and lower molding dies (not shown), respectively.

22, 23 are annular walls formed concentrically with each drive shaft penetration hole 9 in the upper and lower cases 2, 3;
Reference numeral 25 denotes a shutter member that opens and closes the respective head insertion windows 21, 21 in the upper and lower cases 2, 3. 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. 2
8 and 29 are respective setting recesses of the shutter members 24 and 25 formed in the upper and lower cases 2 and 3, respectively;
30 and 31 are selector display openings formed in the upper and lower cases 2 and 3, 32 are openings formed in the disk 10 corresponding to the display openings 30 and 31, and 33 and 34 are display openings. opening 30,
31, which are notch holes formed in the shutter members 24, 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 of the stopper wall 41 in the closed position (see FIG. 7) in the closing direction.
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. 8, 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. 9A, 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
These are concave and convex portions for positioning, and are set at positions equidistant from both the formation positions of the first concave and convex portions 51 and 52 and the formation positions of the second concave and convex portions 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. 13) 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. Projections 66, 66 facing outward are formed at the tips of each pair of elastic arms 60, 61 of each movable element 59, and correspond to the closed position and open position of the movable element 59.
As shown in FIGS. 10 and 11, it is adapted to removably engage with moderation grooves 67 and 68 formed in the bottom walls of the upper and lower guide recesses 64 and 65, respectively. Reference numerals 69, 69 are operation windows formed in the front wall 1a for moving and operating the movable elements 59, 59 from the outside, and as shown in FIG. The knobs 70, 70 protruding from the side surfaces are exposed.

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. 6,
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. 9A 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 mover 59, 5 is open or not.
9 is in the closed position shown by the solid line in FIG. 11, it is ready for recording.

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, 25 are moved as shown by the solid line in FIG. Rotate to the open position. As a result, the head insertion windows 21, 21 and the selector display openings 30, 31 are opened. Head insertion window 2
1, the magnetic head H is disposed opposite to the magnetic disk 10, so that recording can be performed on the disk 10 while the magnetic disk 10 is rotated by the drive shaft P that engages with the hubs 13 and 14. Alternatively, the information recorded on the disc 10 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.

If there is no need to rewrite the recorded information after information has been recorded on the magnetic disk 10, each movable element 59 may be moved to the open position shown by the dotted line in FIG. 11 to open the transmission holes 62, 63.

Here, the joint surface trace 2 of the upper and lower molds for case molding
10a, 210b are present on the inner wall surface of each head insertion window 21 of both the upper and lower cases 2, 3, even if these bonding surface traces 210a, 210b become burrs, they will not remain on the inner wall surface of both the upper and lower cases 2, 3. There is no risk of protrusion, and therefore the opening and closing movement of the shutter members 24, 25 can be maintained smoothly.

As described above, this invention provides a disc cartridge in which the opening and closing operations of the shutter member can be performed properly because the bonding surface marks of the pair of upper and lower molding dies are present in the inner wall surface of the head insertion window. Can be done.

[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 sectional view of the upper and lower cases showing the main parts of this invention.
Fig. 6 is a perspective view showing the engagement structure between the shutter member and the slider, Fig. 7 is an explanatory view of the tip of the slider, Fig. 8 is a sectional view showing the reference pole insertion hole, and Figs. 9A and B are Cross-sectional views before and after fusion, showing the recesses and protrusions for positioning, respectively; Figure 10 is an enlarged plan view of the lower case showing the setting part of the movable element for preventing accidental erasure; and Figure 11 is the setting of the movable element. 12 is a front view showing the operation window of the mover, FIG. 13 is a plan view of the lower case that also serves to explain the operation of the shutter member, and FIG. 14 is the molding of a conventional disk cartridge. FIG. 15, a sectional view showing the mold, is an explanatory diagram of a case obtained using a conventional molding mold. 1...Case body, 2...Upper case, 3...Lower case, 21...Magnetic head insertion window, 24, 25
...Shutter member, 210a, 210b...Remains of joint surface.

Claims (1)

[Scope of utility model registration request] A synthetic resin case body consisting of an upper and lower case body, magnetic head insertion windows formed on the upper and lower walls of the case body, and magnetic head insertion windows arranged on the upper and lower inner walls of the case body to allow the head to be inserted. A disk cartridge comprising a shutter member that closes the window so as to be openable and closable, and in which traces of the bonding surfaces of the upper and lower case molding molds are present within the inner wall surface of each of the insertion windows.