JPS6141183Y2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to a disk cartridge in which the shutter member for opening and closing the magnetic head insertion window can be rotated from the outside to the open and closed positions using a slider that receives a return spring force. .

In a conventional cartridge of this kind, as shown in FIG. 14, an operated projection 102a of a slider 102 for rotationally displacing a shutter member 101 rotatably supported on a case body 100 to an open/close position and the projection 102a. A return spring 104 of the slider 102 was locked between a spring locking pin 103 formed on the case body 100 and located on the rear side.

However, when the shutter member 101 is rotationally displaced to the open position, a large spring return force acts on the spring locking portion of the operated projection 102a of the slider 102, while the projection 102a cannot be operated from outside the case. The operated protrusion 102a of the slider 102 is exposed outside the case due to the need to
There have been problems in which the return spring 104 has come off from the guide groove 105 of the slider 102, and the return spring 104 has come off the locking recess 106 of the projection 102a, making proper operation difficult.

Therefore, in this invention, the proximal end of the slider is extended to form an operated protrusion and a spring locking part separately, and the spring locking part is located on the rear side of the proximal end relative to the protrusion. An object of the present invention is to provide a disc cartridge which enables smooth and reliable locking of a return spring by forming a regulating wall in the case body that supports the shutter member in the open position. It is said that

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 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). 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, an outward tapered surface 38 is formed at the tip of the slider 35, as shown in FIG. Reference numeral 39 designates a spring locking portion such as a spring hook protruding from the inner surface of the base end 35b of the slider 35 in the vicinity of the base end 350b.

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,
Proximal end 350 of slider 35 in closed position of 25
For example, the spring 42 closes the shutter members 24 and 25 with respect to the slider 35. It applies a spring force in the direction of pushing it into position. Reference numeral 44 denotes an operated protrusion that is formed on the outer surface of the base end 35b of the slider 35 and located in front of the spring hanging piece 39, and is externally operated.

The base end portion 35 of the slider 35 has a spring hook 39 to which one end 42a of the return spring 42 is locked.
b has its base end 350b connected to the shutter members 24, 2.
5, in the open position, the spring hook 39 extends to a rear position near the locking pin 43, as shown in FIG. The inner surface 71a of the outer peripheral side wall 71 provided in the case body 1 adjacent to 40
It is set so that it is in a position opposite to. Therefore, even if a lateral pressing force is exerted on the spring hanging piece 39 by the return spring 42 in this position,
Due to the supporting action of the outer peripheral side wall 71, the slider 35
will not come off from the sliding groove 40. It goes without saying that the straight portion 40b of the sliding groove 40
As shown in FIG.
b is extended so that it is located at a rear position near the locking pin 43.

The regulating wall that supports the spring hanging piece 39 is not limited to the outer peripheral side wall 71, and can be provided at an appropriate position corresponding to the sliding groove 40. Further, the stop position of the slider 35 is the base end 350b of the slider 35.
may be regulated by contacting the inner surfaces of the outer circumferential walls 4, 5 of the upper and lower cases 2, 3, or by contacting the rear end 400b of the sliding groove 40, and the base end 35b of the slider 35. The operation may be restricted by bringing the operated protrusion 44 formed on the outer surface of the outer peripheral side wall 71 into contact with the tip end surface 71b of the outer circumferential side wall 71.

Reference numerals 45 and 46 are reference pole insertion holes (not shown) on the side of the recording/reproducing device, which 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. 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 one insertion hole 4
5 is an annular wall surrounding the inner wall of the lower case 3, and 48 is an annular wall surrounding one of the insertion holes 45 and projecting from the inner wall of the upper case 2. , as shown in FIG. 8, 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 is an annular wall surrounding the other insertion hole 46 and protruding from the inner wall of the lower case 3;
The upper case 2 surrounds the other insertion hole 46.
This is an annular wall that protrudes from the inner wall of the annular wall, and the tip 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 and fit together in the vicinity of one of the insertion holes 45, and the recess 51 is, for example, a cylinder. 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 recesses and protrusions 53 and 54 having the same configuration as the recesses and protrusions 51 and 52 are formed on the inner walls of the upper and lower cases 2 and 3. There is. On the distal end surface of each of the convex portions 52 and 54, a concave portion 55 is formed on the concave surface, and a protrusion 56 for ultrasonic welding is formed on the peripheral edge (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 forming positions of the first concave and convex portions 51 and 52 and the forming 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. 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. 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 operating 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 pressed and immersed 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,
The slider 35 is fitted into the sliding groove 40 of the lower case 3 while its tip side is curved, and a return spring is inserted between the spring hook 39 of the slider 35 and the locking pin 43 of the lower case 3. Hang 42. 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 of the fused parts 6, 7 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, 3 are combined. be converted into If ultrasonic waves are also applied to the first concave and convex portions 51 and 52 and the second concave and convex portions 53 and 54, the protrusions 56 on the tip periphery of each convex portion 52 and 54 will change from the state shown in FIG. 9A to the same state as in FIG. As shown in Figure B, the concave part 5 of the other party is melted.
By fusing the upper and lower cases 1 and 53, 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.
9 and 59 are in the closed position shown by solid lines in FIG. 11, it is ready for recording. On the other hand, if it is in the open position shown by the dashed line in FIG. 11, it is in a state where it cannot record.

Next, when the case 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 device side, the slider 35 moves rearward against the spring force of the return spring 42, and the shutter member 24 is moved as shown by the solid line in FIG. , 25 to the open position, and open the head insertion windows 21, 21 and the selector display opening 3.
0,31 are opened. By opening the head insertion window 21, the magnetic head H is placed opposite to the magnetic disk 10. Therefore, while the magnetic disk 10 is being rotated by the drive shaft P that engages with the hubs 13 and 14, the magnetic disk 10 can be opened. The information recorded on the disc 10 can be recorded on or reproduced from the disc 10.

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.

As is clear from the above description, when the shutter members 24 and 25 are in the open position, the spring hook 39 of the base end 35b of the slider 35 is positioned within the regulating wall 71 of the case body 1 so that the operated projection 44
Since the slider 35 is provided at a position extending toward the rear side of the
Even if the slider 3 is biased laterally by the
The vicinity of the base end 350b of the slider 35 can be effectively prevented from coming into contact with the inner surface of the regulating wall 71 and detaching the slider 35 from the sliding groove 40. Furthermore, since the spring hooking piece 39 of the slider 35 is provided separately from the operated projection 44 and the return spring 42 is locked thereto, the work of locking the spring 42 is facilitated and can be carried out reliably.

As described above, in this invention, the base end of the slider that rotationally displaces the shutter member for opening and closing the magnetic head insertion window is extended rearward by a specific length, and this portion is extended rearward from the operated protrusion. By forming the spring locking portion to be located separately from the projection, and by providing a regulating wall on the case body that supports the spring locking portion when the shutter member is in the open position, the installation work of the return spring of the slider is simplified. It is possible to provide a disk cartridge that can be easily and securely installed.

[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 diagram of the tip of the slider, Figure 7 is an explanatory diagram of the main part of this invention, and Figure 8 is an illustration of the reference pole insertion hole. 9A and 9B are cross-sectional views before and after fusion showing the positioning concave and convex portions, respectively. A plan view, FIG. 11 is a front sectional view showing the setting part of the mover, FIG. 12 is a front view showing the operation window of the mover, and FIG. 13 is a plan view of the lower case, which also serves as an explanation of the operation of the shutter member.
FIG. 14 is an explanatory diagram of a conventional example. DESCRIPTION OF SYMBOLS 1... Case body, 21... Magnetic head insertion window, 24, 25... Shutter member, 35... Slider, 39... Spring hanging piece (spring locking part), 40
...Sliding groove, 42... Return spring, 35b... Base end portion, 44... Protrusion for operation, 71... Outer peripheral side wall (regulating wall).

Claims (1)

[Scope of utility model registration request] A magnetic head insertion window formed in the case body,
A shutter member rotatably supported within the case body to open and close the head insertion window, and a shutter member rotatably displaced to the open and closed positions in response to setting and resetting operations on the recording/reproducing device. a flexible slider, a protrusion for operation provided on the slider, a sliding groove formed on the inner wall of the case body to guide movement of the slider, and a protrusion for operation at the base end of the slider; and a return spring that is hung behind the slider and applies a spring force forward in the sliding direction to the slider, and supports the spring locking portion at the base end of the slider when the shutter member is in the open position. A disk cartridge cartridge characterized in that a regulating wall is provided in the case body.