JPH0485783A - Production of flexible magnetic disk - Google Patents

Abstract

PURPOSE:To improve the reliability of a magnetic disk by removing the lint, etc., of an unwoven fabric liner out of the surface of a magnetic disk and then ejecting the lint to the outside of a case with high efficiency. CONSTITUTION:The ultrasonic vibrations are applied to a magnetic disk 7 stored in a case 10 in order to eject the foreign matters such as the lint, etc., scattered in the disk 7 to the outside of the case 10. Thus the lint stuck onto the surface of the disk 7 is removed and at the same time the inside air of the case 10 is absorbed through a head window opening part 11 formed to the case 10. Thus the lint can be ejected out of the case 10. The disk 7 is stored in the case 10 including an unwoven fabric 6 cut in a prescribed size and fixed onto the inner surface of the case 10. In such a production method of the disk 7, the ultrasonic vibrations are applied to the assembled disk 7 stored in the case 10 from a device 16. At the same time, the inside air of the case 10 is absorbed through the part 11.

Description

DETAILED DESCRIPTION OF THE INVENTION A1.Object of the invention [Field of industrial application] The present invention relates to a method of manufacturing a flexible magnetic disk.

[Conventional technology]

Flexible magnetic disks are widely used as external storage elements in so-called basonal computers.

One of the most important reliability requirements for this flexible magnetic disk is the absence of missing (drop-out) errors or extra (drop-in) errors.

One of the causes of these errors is the intrusion of dust from the outside, and in recent years, 3.
Small flexible magnetic disks with a size of 5" or less have various dustproof measures that have not been seen in conventional flexible magnetic disks with a size of 5.25" or more.

On the other hand, it is known that dust generated from components inside a flexible magnetic disk can also cause similar errors, and in particular, the nonwoven fabric liner provided on the inner surface of the magnetic disk for the main purpose of collecting dust has its own When a part of the fiber is subjected to vibration, it becomes a minute amount of falling matter ranging from several microliters to several tens of microliters, which causes an error.

Figure 2 shows its components. - In the case of so-called hard case type flexible magnetic disks, such as the 3.5" micro floppy disk used for boat fishing, the disk case may be exposed to ultrasonic vibration during the assembly process, resulting in As described above, fine nonwoven fabric fibers (hereinafter referred to as lint) released from the liner base material adhere to or adhere to the surface of the flexible magnetic disk medium, which poses a problem.

As one solution to this problem, a flexible magnetic disk is provided on the upper and lower shells of the magnetic disk case 10 in order to allow the magnetic head to slide in contact with the magnetic disk when recording and reproducing the flexible magnetic disk shown in FIG. A method of removing the lint and the like by spraying cleaning gas from the jet nozzle 14 through the head window 11 (opening window) while rotating the magnetic disk, or a method of removing the lint etc. from the upper and lower shells of the magnetic disk case 10 shown in FIG. A method has been proposed in which the lint is removed by suctioning cleaning gas from the head window 11 through a suction nozzle 15 that is in close contact with the head window 11 while rotating the magnetic disk 7.

However, since it is necessary to remove lint, etc. that has adhered to the surface of the magnetic disk over the entire surface of the disk, when using the above cleaning method, the adhered substances are removed through the head window, which is an opening provided in the case. Therefore, it is necessary to rotate the magnetic disk housed in the magnetic disk case, and during this rotation, the magnetic disk and the nonwoven liner slide, causing the lint that has adhered to the disk surface to re-adhere to the liner. Alternatively, sticking may occur on the surface of the magnetic disk, and these methods are not reliable removal methods and require improvement.

[Problem to be solved by the invention]

In a method for manufacturing a flexible magnetic disk, the present invention efficiently removes lint from a nonwoven fabric liner that may cause errors without re-adhering to the liner or fixing it to the magnetic disk, thereby improving reliability. The purpose of the present invention is to provide an effective method for manufacturing flexible magnetic disks that yields excellent products.

5. Structure of the Invention [Means for Solving the Problems] In order to solve the above-mentioned problems, the present invention provides a method for expelling foreign matter such as lint scattered within a flexible magnetic disk to the outside of a case of the flexible magnetic disk. Ultrasonic vibrations are applied to the magnetic disk housed in the case to release lint attached to the surface of the magnetic disk from the disk surface while sucking air inside the case through a head window opening formed in the case. This provides a method characterized in that the lint is discharged to the outside of the storage case.

That is, the present invention provides a method for manufacturing a flexible magnetic disk in which a magnetic disk is housed in a case in which a nonwoven fabric cut to predetermined dimensions is fixed to the inner surface of the case. This method of manufacturing a flexible magnetic disk is characterized in that gas inside the case is sucked through a head window opening formed in the case while applying ultrasonic vibration to the magnetic disk housed therein.

[Effect]

In order to discharge foreign matter such as lint scattered inside the storage case of the flexible magnetic disk from the case, ultrasonic vibration is applied to the magnetic disk stored in the case, and the magnetic disk is Lint, etc. from the non-woven fabric liner adhering to the disk surface can be released from the disk surface and efficiently and sufficiently discharged to the outside of the case, so there is no need to rotate the magnetic disk, and lint, etc. that can cause errors can be removed from the liner. Reattachment or adhesion to the surface of the magnetic disk can be suppressed.

〔Example〕 Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is an external perspective view showing an outline of a magnetic disk cleaning method according to an embodiment of the present invention. Figure 2 is an exploded external perspective view of an example of a commonly used 3.5'' microfloppy disk, and Figures 3 and 4 are external views showing an outline of a cleaning method using a conventional magnetic disk manufacturing method. Perspective view.

As shown in FIG. 2, after a magnetic disk 7 and a write protector 9 having a metal hub 4 provided thereon via an adhesive ring 5 are housed between an upper shell 1 and a lower shell 2 to which a nonwoven liner 6 is fixed. , Storage capacity 2. The four corners of the shell are ultrasonically welded and the shutter 3 and opening/closing spring 8 are attached.
One hundred 0MB 3.5'' microfloppy disks were made under the same manufacturing conditions, and the test was conducted under three manufacturing conditions.

(Example 1) FIG. 1 is an explanatory external perspective view showing an outline of a cleaning method used in the method of manufacturing a flexible magnetic disk according to the present invention. In Figure 1, 3
A magnetic disk case 10 of a 5'' microfloppy disk is mounted on a case support frame 13 with a head window 11 open.

At this time, the metal hub of the magnetic disk 7 is connected to the ultrasonic generator 1.
It is connected to the 6th vibrator. In this state, while applying ultrasonic vibrations to the magnetic disk using the ultrasonic generator 16 at a shoulder frequency of 25 KHz and an output of 500 W, the suction nozzle 15 that is in close contact with the head window portion of the upper and lower shells of the flexible magnetic disk generates a gas suction flow rate of 0. 5+g+3/■
100 samples were prepared by suctioning in for 3 seconds.

(Comparative Example 1) Next, a sample cleaned and finished by the conventional method shown in FIG. 3 was designated as Comparative Example 1. In Comparative Example 1, 100 remaining magnetic disks assembled under the same conditions as the samples used in the above example were mounted on the cleaning device shown in FIG. 3 with the head window 11 opened in the case support frame 13, and the magnetic disks were While rotating the magnetic disk with a door at a rotation speed of 300 rp via a rotary drive shaft 12 to which a metal hub is chucked, clean air with a pressure of I kg/c 2 is injected as a cleaning gas from an injection nozzle 14, and 3 Washed for seconds.

(Comparative Example 2) Comparative Example 2 was a sample that was further cleaned and finished by the conventional method shown in FIG. Comparative Example 2 is a fourth sample of the remaining 100 samples assembled under the same conditions as the samples used in the above example.
The head window 11 is mounted on the case support frame 13 of the cleaning device shown in the figure with it open, and the magnetic disk is rotated at a rotational speed of 300 rpm via the rotary drive shaft 12 to which the metal hub of the magnetic disk is chucked. While letting
Suction was performed for 3 seconds at a gas suction flow rate of 0.513/in from suction nozzles 15 that were in close contact with the head window portions of the upper and lower shells of the case.

Above Example 1, Comparative Example 1. 100 each for comparative example 2
A total of 300 sheets were produced, and the track quality was evaluated according to the track quality inspection conditions shown in Table 1 below.

Margin below Table 1 The track quality inspection results are shown in Table 2.

Table 2 As can be seen from the results in Table 2, the quality of the products manufactured by the method of the present invention is improved compared to the products manufactured by the conventional method as a comparative example.

The ultrasonic wave generation conditions of the device used in this example were such that the oscillation frequency was in the range of 20 kHz to 60 kHz and the output was 500 W or more, so that the effects of the present invention could be fully exhibited. but,
Excitation with more output than necessary damages the magnetic disk, so it is necessary to adjust the vibration depending on the type of magnetic disk and the application device. Furthermore, the gas suction flow rate in the device used in this example was 0.5 m3/min.
However, the gas suction flow rate varies depending on the state of the lint attached to the surface of the magnetic disk, so it needs to be adjusted depending on the quality condition. Further, the cleaning time according to the present invention also needs to be set depending on the amount of lint attached to the surface of the magnetic disk.

C.9 Effects of the Invention [Effects of the Invention] According to the present invention, in the method for manufacturing a flexible magnetic disk, lint of a nonwoven fabric liner adhering to the surface of the magnetic disk is released from the surface of the magnetic disk, and the lint and the like are efficiently removed from the outside of the storage case. Since the lint can be discharged well and sufficiently, there is no need to rotate the magnetic disk, and it prevents the lint from re-adhering to the liner or sticking to the surface of the magnetic disk, which could be a cause of errors, resulting in excellent reliability. This makes it possible to provide products with improved quality.

Although the present embodiment has been described with respect to a 3.5" microfloppy disk, the effects of the present invention are not limited to only 3.5" microfloppy disks.
This effect is also recognized in various types of floppy disks having hard cases, such as 3" compact floppy disks and 2" metal floppy disks, and is not limited to the type of magnetic disk.

[Brief explanation of the drawing]

FIG. 1 is an external perspective view showing an outline of a cleaning method used in a method of manufacturing a magnetic disk according to an embodiment of the present invention. Fig. 2 is an exploded external perspective view of an example of a commonly used 3.5'' microfloppy disk. Figs. 3 and 4 are schematic diagrams of the cleaning method used in the conventional magnetic disk manufacturing method. It is an external perspective view showing 1... Upper shell, 2... Lower shell, 3... Shutter, 4... Metal hub, 5... Adhesive ring, 6...
Nonwoven fabric liner, 7... Magnetic disk, 8... Opening/closing spring, 9... Write protector, 10... Magnetic disk case, 11... Head window, 12...
Rotation drive shaft, 13... Case support frame, 14... Injection nozzle, 15... Suction nozzle, 16... Ultrasonic generator. Figure 1 Patent applicant Tokin Co., Ltd. Figure 2 Figure 313

Claims (1)

[Claims] 1. In a method for manufacturing a flexible magnetic disk in which a magnetic disk is housed in a case with a nonwoven fabric cut to predetermined dimensions and fixed to the inner surface of the nonwoven fabric, the assembled flexible magnetic disk is housed in the case. A method for manufacturing a flexible magnetic disk, comprising sucking gas inside the case through a head window opening formed in the case while applying ultrasonic vibration to the magnetic disk.