JPS637987Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a disk cartridge in which an optical signal transmission hole for recording prevention detection is provided in the vicinity of the peripheral wall of the case body, which is composed of an upper and lower case body.

In general, in this type of cartridge, the accidental erasure prevention means provided in the case body selectively opens and closes the optical signal transmission hole for recording prevention detection.
It is designed to prevent the recorded contents of the magnetic disk from being changed inadvertently.

That is, as shown in FIGS. 13 and 14, the conventional erroneous erasure prevention means has an erroneous erasure prevention member that opens and closes an optical signal transmission hole 101 for recording prevention detection, and has an elastic piece 102 with only one arm. It is composed of a plate-shaped movable element 103, which is set on a sliding part 105 formed on the case body 104, and is operated from an operation window 106 formed on the upper wall 104a of the case body 104. 107 is provided protrudingly from the upper surface of the movable element 103.

However, with the above configuration, when the protruding state of the knob 107 is below the upper surface of the upper wall 104a as shown in FIG. 14, it is difficult to manually operate it from the outside. If it exceeds the top surface of the disk, it is easy to manually operate it, but there is a risk of inadvertent contact during handling, causing malfunction, and there is a problem that it lacks reliability as a means for preventing erroneous erasure.

The purpose of this invention is to address the above-mentioned problems and provide a disk cartridge equipped with means for preventing erroneous erasure, which can be easily operated from the outside and is less likely to cause malfunctions.

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 drive shaft P having a locking shaft portion _P2 , the magnetic disk 10, upper hub 13 and lower hub 14 have engaging holes 15a and 1.
6a and 17a are formed, respectively. Of course, the insertion holes 15, 16, 17 and the engagement hole 15
Depending on the type and shape of the drive shaft P, a, 16a, and 17a can be configured with one engagement hole. 1
Reference numeral 8 designates a disk rotation stopper pin formed on the lower hub 14, and reference numeral 19 represents a small hole formed in 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 portion corresponding to the curved portion is molded into a thin wall 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 are 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 width direction on the front side of the case body 1, and are formed in the upper and lower cases 2 and 3, respectively. One insertion hole 45 has a large diameter on the lower case 3 side and a small diameter on the upper case 2 side, for example, and the other insertion hole 46 has the opposite configuration. 47
48 is an annular wall surrounding one insertion hole 45 and protruding from the inner wall of the lower case 3;
This is an annular wall that surrounds and protrudes from the inner wall of the upper case 2, and these annular walls 47 and 48 have a distance of, for example, 1/2 of the distance between the inner walls of the upper and lower cases 2 and 3, as shown in FIG. They are formed at a height of , so that their tip 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; 50 is an annular wall surrounding the other insertion hole 46 and protruding from the inner wall of the upper case 2; Similarly to the above, the respective tip surfaces are joined to each other.

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 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. A concave portion 55 is formed on the distal end surface of each of the convex portions 52 and 54, so that a protrusion 5 for ultrasonic welding is formed on the peripheral edge.
6 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).

Numerals 59 and 59 are optical signal transmission holes for recording prevention detection formed through the upper and lower walls of the case body 1, and are formed at both ends in the case width direction at the front of the case body 1, respectively. Reference numerals 60 and 60 designate a pair of movable plates for preventing accidental erasing that selectively open and close the respective transmission holes 59 and 59, and since both have the same configuration, in the following, one movable plate 60 will be referred to as the ninth The explanation will be made mainly with reference to the figures.

The movable plate 60 is made of synthetic resin or the like, and the upper and lower ends of a rotating shaft 61 formed integrally with itself are inserted into the upper and lower walls of the case body 1, that is, through the shaft holes 62 and 63 formed in both the upper and lower cases. By fitting each other, they are rotatably supported within the case body 1 in a horizontal plane (see FIG. 10). 64 is a movable plate 60 formed on the lower case 3
65 is the free end 6 of the movable plate 60.
The protrusions 66 and 67 formed on the end face of the movable plate 60 are moderation grooves that are removably engaged with the protrusion 65 in the open and closed positions of the movable plate 60, and the inner wall 64a of the recess 64 is formed. In other words, the protrusion 65 formed at the tip of the movable plate 60 and the grooves 66 and 67 formed in the case body 1 are used to respectively engage the moderation engaging part and the locking part that locks this engaging part. It is configured as follows. A notch 68 is formed in the free end 60a of the movable plate 60 so that the protrusion 65 can be properly engaged and disengaged from the grooves 66, 67.

Reference numeral 69 denotes an engaging portion formed on either of the upper and lower end surfaces of the rotation shaft 61;
is engaged with an operating tool M such as a screwdriver when the movable plate 60 is rotated from the outside.

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. Further, the movable plate 60 is assembled by fitting each rotating shaft 61 of the movable plate 60 into the shaft holes 62 and 63 to prevent erroneous erasing.

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, it is checked whether the transmission holes 59, 59 for the recording prevention detection optical signal are blocked by the movable plates 60, 60. Movable plate 6
If 0 and 60 are in the closed position shown by the solid line in Figure 11,
It is ready for recording.

Next, when the case body 1 is inserted forward into a recording/reproducing device (not shown), the operated protrusion 44 of the slider 35 engages with a member (not shown) on the device side as a result of this forward insertion operation. 12, the slider 35 moves rearward against the spring force of the return spring 42, rotating the shutter members 24, 25 to the closed position as shown by the solid line in FIG. This opens the head insertion windows 21, 21 and the selector display openings 30, 31. 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 returned from being installed, 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 the recorded information does not need to be rewritten, each movable plate 60 is moved to the open position shown by the chain line in FIG. Just leave it open.

In the above configuration, as detailed in FIGS. 9 to 11, the optical signal transmission hole 59 for recording prevention detection is
The erroneous erasure prevention member that selectively opens and closes is composed of a movable plate 60 rotatably supported within the case body 1, and an engaging portion 6 provided on a rotation shaft 61 of the movable plate 60.
9, for example, a driver M (FIG. 9) is locked to the movable plate 60, a moderation engaging part 65 formed at the tip of the movable plate 60, a locking part 66 formed inside the case body 1, 67 so that the lock can be moved to the open position and the closed position.
Compared to the conventional erroneous erasure prevention means shown in FIGS. 3 and 14, the opening and closing operations can be performed more easily and reliably, and there is no need to provide a knob for manual operation of the movable plate 60, which prevents erroneous operation. There is no risk of causing this, and the reliability as a means for preventing erroneous erasure is greatly improved.

As mentioned above, this idea allows the optical signal transmission hole for recording prevention detection formed in the case body to be selectively opened and closed by a movable plate that is rotated by an operating tool, so that it is possible to prevent accidental damage. Therefore, it is possible to provide a disk cartridge that can prevent unnecessary opening/closing operations.

[Brief explanation of drawings]

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 exploded perspective view showing the movable plate for preventing accidental erasure and its setting portion, and FIG. 10 is a case showing the setting portion of the movable plate. FIG. 11 is a partial sectional view of the main body, FIG. 11 is an explanatory diagram of the operation of the movable plate, FIG. 12 is a plan view of the lower case that also serves to explain the operation of the shutter member, and FIGS. It is an explanatory diagram. 1...Case body, 10...Magnetic disk, 5
9, 59... Transmission hole, 60, 60... Movable plate, 6
1...Rotation shaft, 65...Protrusion (moderation engagement part),
66, 67...Groove portion (locking portion), 69...Engaging portion,
M...Manipulation tool.

Claims (1)

[Scope of utility model registration request] A magnetic disk disposed within the case body, an optical signal transmission hole for recording prevention detection formed through the upper and lower walls of the case body, and a pivot support rotatable in a horizontal plane within the case body. and a movable plate for preventing accidental erasure that selectively opens and closes the transmission hole, and a movable plate provided on the rotation axis of the movable plate to engage the operating tool when the movable plate is operated from the outside with the operating tool. and a moderation engaging part is formed at the tip of the movable plate, and a locking part for locking the engaging part is formed in the case body. .