JPH064974U - Magnetic disk cartridge - Google Patents

Abstract

(57) [Summary] [Purpose] To prevent the occurrence of a gap in the seam between the upper case and the lower case in a magnetic disk cartridge without causing dropout. [Structure] Welding portions 2 for ultrasonically welding an upper case 14 and a lower case 16 to four corners of a cartridge case 18.
6 are provided respectively, and a connecting portion 2 for connecting the upper case 14 and the lower case 16 by press-fitting at the time of the ultrasonic welding in the vicinity of the center of the rear side edge portion 18b of the cartridge case 18.
8 is provided. Dust is generated in the vicinity of the welded portion 26 by the ultrasonic welding. However, since the portion near the center close to the magnetic disk 12 is joined by press-fitting instead of welding, the upper and lower cases 14 where the rear side edge portion 18b is located without generating dust that causes dropout, It is possible to prevent the generation of gaps at the 16 seams.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic disc cartridge, and more particularly to a coupling structure of an upper case and a lower case of the cartridge case.

[0002]

[Prior art]

 A magnetic disk cartridge such as a floppy disk generally comprises a magnetic disk and a cartridge case in which an upper case and a lower case are combined and welded so as to accommodate the magnetic disk. Welding portions for performing the above welding are provided at the four corners.

A gap may occur at the joint between the upper case and the lower case due to the above-mentioned welding. When such a gap occurs, when the magnetic disk cartridge is attached to or detached from the magnetic disk drive device. The static electricity charged on the human body may be discharged through the gap, which may cause dielectric breakdown or the like. The generation of the above-mentioned gap becomes a particular problem at the seam on the side opposite to the seam on the side where the head insertion opening is formed in the cartridge case (hereinafter referred to as "rear seam").

Therefore, conventionally, as disclosed in Japanese Utility Model Application Laid-Open No. 60-180377, the rear seam is welded over the entire area, or disclosed in Japanese Utility Model Application Laid-Open No. 62-42172. As described above, a magnetic disk cartridge has been proposed in which a welding portion is provided in the vicinity of the center of the side edge portion of the cartridge case where the rear seam is located, thereby preventing a gap from being generated in the rear seam. ing.

[0005]

[Problems to be solved by the device]

 However, since the rear seam or the central portion of the side edge portion is located close to the magnetic disk, if the welding is applied to these portions, the following problems occur. That is, since welding between the upper case and the lower case is generally performed by ultrasonic welding, ultrasonic vibrations at the time of welding cause plastic dust to be generated from the cartridge case or dust from the nonwoven fabric forming the liner. However, there was a problem in that they adhered to the magnetic disk located nearby and caused dropout.

The present invention has been made in view of the above circumstances, and provides a magnetic disk cartridge capable of preventing the generation of a gap between the upper case and the case without causing a dropout. It is intended to be provided.

[0007]

[Means for Solving the Problems]

 In the magnetic disk cartridge according to the present invention, the above-mentioned object is achieved by providing a coupling means in the vicinity of the center of the side edge portion that does not generate dust.

That is, in a magnetic disk cartridge comprising a magnetic disk and a cartridge case in which an upper case and a lower case are combined and welded so as to accommodate the magnetic disk, a cartridge case is provided. Welding portions for performing the welding are provided at the four corners, respectively, and the upper case and the lower case are attached to the vicinity of the center of at least one side edge of the cartridge case by press-fitting or adhesive during the welding. It is characterized in that a connecting portion for connecting and is provided.

[0009]

[Function and effect of device]

 As shown in the above configuration, at least one side edge portion of the cartridge case is provided with a connecting portion for connecting the upper case and the lower case with each other by press-fitting or an adhesive at the time of welding, in the vicinity of the center thereof, so that dust is prevented. It is possible to prevent the occurrence of a gap at the seam of the upper and lower cases in which the side edge portions are located without generating the gap.

Therefore, according to the present invention, it is possible to prevent the occurrence of a gap at the seam between the upper case and the lower case without causing dropout. Since the upper case and the lower case are welded at the four corners of the cartridge case, dust is unlikely to adhere to the magnetic disk, and therefore dropout does not occur.

Further, since there is no gap between the upper case and the lower case as described above, it is possible to completely prevent data destruction due to static electricity. This also makes it possible to reduce the electrical resistance of the magnetic disk, and by doing so, dust and the like are less likely to adhere, the probability of error occurrence can be reduced, and a high-quality disk cartridge can be obtained. Obtainable.

A gap between the upper case and the lower case is particularly problematic because the seam on the side opposite to the side where the head insertion opening of the cartridge case is formed. It is particularly effective to provide the connecting portion on the side edge portion where the seam is located.

[0013]

【Example】

 Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

FIG. 1 is an exploded perspective view showing an embodiment of a magnetic disk cartridge according to the present invention.

The magnetic disk cartridge 10 includes a magnetic disk 12 and a cartridge case 18 in which an upper case 14 and a lower case 16 are combined and welded so as to accommodate the magnetic disk 12, Further, liners 20 are fixed to the inner surfaces of the upper and lower cases 14 and 16, respectively, and the front side edge 18a of the cartridge case 18 on the side where the head insertion opening 22 is formed has a shredder. The cutter 24 is attached.

Welding portions 26 for performing the welding are provided at four corners of the cartridge case 18, respectively, and a rear side edge of the cartridge case 18 opposite to the front side edge portion 18 a. A pair of connecting portions 28 for connecting the upper case 14 and the lower case 16 by press-fitting at the time of welding are provided near the center of the portion 18b.

As shown in detail in FIG. 2, each welded portion 26 is composed of cylindrical bosses 30 and 32 formed in the upper and lower cases 14 and 16, respectively, and is attached to the tip surface of the boss 32 by ultrasonic vibration. The formed welding projection 32a is welded to the tip surface of the boss 30. Each coupling portion 28 is composed of cylindrical bosses 34 and 36 formed in the upper and lower cases 14 and 16, respectively, and the small-diameter boss 34 is press-fitted into the large-diameter boss 36 so that both the bosses 34 and 36 are formed. Are to be combined. The length of the boss 34 is set so that a slight gap is formed between the tip surface of the boss 34 and the bottom surface of the boss 36 when the welding is completed.

FIG. 3 is a sectional view showing the state of the magnetic disk cartridge 10 when the cartridge case 18 is assembled, at a rear side edge portion 18 b (see FIG. 1) of the cartridge case 18.

As shown in the figure, after the upper case 14 and the lower case 16 are combined and set on the base 40, the welding horns 42 are lowered from above the respective welding portions 26 and brought into contact with the upper case 14, and ultrasonic waves are applied. The welding of each welding portion 26 is performed by applying vibration. Simultaneously with the lowering of the welding horn 42, the elastic member 44 is lowered from above the joints 28 to abut against the upper case 14, and further pressure is applied to the upper and lower cases 14, 16 at each joint 28. Are press-fitted to join them.

As described above, in the present embodiment, the joint portion 28 for joining the upper case 14 and the lower case 16 by press fitting at the time of welding is provided in the vicinity of the center of the rear side edge portion 18b of the cartridge case 18. Therefore, it is possible to prevent the generation of a gap between the upper and lower cases 14 and 16 where the rear side edge portion 18b is located without generating dust.

Therefore, according to the present embodiment, it is possible to prevent the occurrence of a gap at the seam between the upper case 14 and the lower case 16 without causing dropout.

When the upper and lower cases 14 and 16 are combined, the coupling portion 28 of the present embodiment has the effect of holding the outward force acting on each of the upper and lower cases 14 and 16 by press-fitting fitting force. This has the effect of restricting the deformation of the rear side edge portion 18b of the cartridge case 18 at the side surface contact portion between the boss 34 and the boss 36.

In this embodiment, after the cartridge case 18 is assembled, the upper and lower cases 14 and 16 are assembled by press fitting until the magnetic disk cartridge 10 is finally assembled. Therefore, it is possible to prevent the upper and lower cases 14, 16 from being deformed with time, and it is possible to assemble a flat magnetic disk cartridge 10 having high dimensional accuracy. In particular, since the rear side edge portion 18b of the cartridge case 18 is provided with a region for attaching a label on which the recorded contents are recorded, the recess 18c is formed on the surface of the cartridge case 18 and the cartridge case 18 becomes thin, resulting in insufficient rigidity of the cartridge case 18. It is a place that is easily deformed. By forming the connecting portion 28 in this region, it is possible to prevent deformation of the region having low rigidity before assembly.

Further, in this embodiment, when the upper and lower cases 14 and 16 are welded by the ultrasonic welding machine, the joint portion 28 is pressed from above by the elastic member 44, so that the ultrasonic vibration of this portion is generated. Since the elastic member 44 can absorb the dust, it is possible to suppress the generation of dust from the liner 20 made of a non-woven fabric incorporated in the cartridge case 18 and the generation of dust at the contact portions between the upper and lower cases 14, 16.

In the present embodiment, the purpose is to prevent a space from being formed at the joint between the upper and lower cases 14, 16 of the rear side edge portion 18b of the cartridge case 18, but the rear side edge portion 18b is It is not limited.

In particular, in the case of the lifter (not shown) on the side where the liner 20 built in the cartridge case 18 pushes up the liner 20 so that it comes into contact with the magnetic disk 12, high temperature and high humidity conditions are set. The cartridge case 18 is deformed due to use or storage in the case, and a gap is likely to be formed at the joint between the upper and lower cases 14 and 16. Therefore, in order to prevent this, the connecting portions 28 are provided on all four side edge portions so that no space is created over the entire joint between the upper and lower cases 14 and 16 of the cartridge case 18. Good.

Further, in the present embodiment, the connecting portion 28 is constituted by the cylindrical bosses 34, 36, but the present invention is not limited to this, and the plate-like press-fitting shape as shown in FIG. The connecting portion 50 may be 50. Further, as shown in FIG. 4 (b), a coupling portion 52 may be formed by increasing the coupling strength between the upper and lower cases 14 and 16 in a shape obtained by adding a locking effect to the press-fitting shape. Furthermore, as shown in FIG. 5, instead of press-fitting, an adhesive 54 may be used to form a joint 56.

Since all of these are simple joining methods other than ultrasonic welding, there is no risk of generation of plastic dust or dust from the liner, and since the adhesive is not exposed, the adhesive sticks out to the outside. There is no fear.

[Brief description of drawings]

FIG. 1 is an exploded perspective view showing an embodiment of a magnetic disk cartridge according to the present invention.

FIG. 2 is a sectional view of a main part of the above embodiment.

FIG. 3 is a view showing a cross-section at the rear side edge portion 18b of the cartridge case when the cartridge case of the above embodiment is assembled.

FIG. 4 is a sectional view of an essential part showing a modified example of the above embodiment.

FIG. 5 is a cross-sectional view of essential parts showing another embodiment of the magnetic disk cartridge according to the present invention.

[Explanation of symbols]

 10 Magnetic Disk Cartridge 12 Magnetic Disk 14 Upper Case 16 Lower Case 18 Cartridge Case 18b Rear Side Edge 26 Welding Part 28 Coupling Part

Claims (2)

[Scope of utility model registration request] 1. A magnetic disk cartridge comprising: a magnetic disk; and a cartridge case in which an upper case and a lower case are combined and welded so as to accommodate the magnetic disk, wherein four corners of the cartridge case are provided. A welding portion for performing the welding is provided, and a joining portion for joining the upper case and the lower case to each other in the vicinity of the center of at least one side edge portion of the cartridge case by press fitting or an adhesive at the time of the welding. A magnetic disk cartridge, wherein a magnetic disk cartridge is provided with a section. 2. One of the side edges provided with the coupling portion is a side edge opposite to the side edge provided with the head insertion opening of the cartridge case. The magnetic disk cartridge according to claim 1, wherein: