JPH0125137B2 - - Google Patents

Description

Detailed Description of the Invention (a) Technical Field of the Invention The present invention relates to a method for washing and cleaning a magnetic disk in the process of manufacturing a magnetic disk, which is a storage medium of a magnetic disk device used as an external storage device of a computer. Regarding.

(b) Background of the technology A magnetic disk drive uses a magnetic head to read and write information while rotating a magnetic disk at high speed. There are two methods: one in which the magnetic head is read and written by raising the magnetic head several micrometers above the disk surface. In the case of a floating type, there are two methods in which the magnetic head is loaded onto and unloaded from the disk surface while it is floating, and another method in which the magnetic head comes into contact with the disk surface at the start and end of disk rotation, causing the disk to rotate at high speed. There is a method in which the disk floats up from the surface of the disk only while it is in use.

Even in the case of a floating type, the gap between the disk surface and the magnetic head is extremely small, so if there is a foreign object on the disk surface, it may cause the head to crash, or the foreign object may get caught between the magnetic head and the disk surface and damage the disk surface. There is a risk of injury. If the magnetic coating is scratched in this way, the magnetization during information writing may become unstable, making it impossible to write reliably, or the written information may be destroyed.
This may lead to errors in reading and writing information.

Recently, in order to obtain high-density recording media, there is a tendency to make the media coating thinner and the flying gap of the magnetic head smaller, so chips and errors that can cause scratches and scratches on the disk surface as described above are becoming more and more difficult. It is necessary to completely remove any dirt that may be the cause. In order to meet these demands, disks are
A method of completing a magnetic disk is to apply a magnetic coating film to a flat-finished aluminum disk with high surface precision, dry it, and bake it, then finish the coating film flat, wash it, and dry it. Generally adopted.

However, even if the flat surface finishing of the aluminum substrate or the flat surface finishing of the magnetic coating film is performed well, if the washing and cleaning process after the final coating film finishing is incomplete, dirt, stains, and damaged layers remain. The precision finishing that had been done up to that point came to nothing.

(C) Prior art and its problems The following methods are available as cleaning and cleaning methods in the conventional magnetic disk manufacturing process.

(1) While rotating the magnetic disk at high speed and spraying a solvent such as hot water or pure water onto the surface of the magnetic disk, press a pad such as a porous sponge pad or brush pad while rotating to remove chips along with the solvent, and then apply the magnetic Rotate the disk at high speed and use centrifugal force to shake off the moisture and dry it.
Or blow dry with warm air.

(2) An ultrasonic cleaning method in which ultrasonic waves are applied to clean in a solution or vapor of Freon, trichlene, solvent naphtha, etc.

(3) After flattening the magnetic disk coating, wash it with water, then soak it in a solvent, cotton, or synthetic fiber, wipe it by hand, and dry it by displacement.

Among these methods, methods (1) and (2) can remove most of the minute chips and foreign matter, but have the disadvantage that dirt and dry stains of the cleaning solution are generated locally during the drying process. Furthermore, the method (3) has the drawback that it cannot completely remove moisture and remove fine chips, although stains can be removed.

(d) Purpose of the Invention The purpose of the present invention is to improve the cleaning and cleaning of conventional magnetic disks.
By eliminating these drawbacks in the cleaning process and effectively removing chips, drying moisture, and removing surface deterioration layers after finishing the magnetic disk coating, stains on the magnetic disk can be eliminated. , foreign matter,
The objective is to reliably remove dirt and achieve a smooth surface condition that satisfies the low flying height of the magnetic head.

(e) Structure of the Invention In order to achieve this object, the present invention includes a cleaning water injection device and a cleaning device for cleaning porous sponge pads, brush pads, etc. in one room during the cleaning and cleaning process when manufacturing magnetic disks. With the wiping device retracted from the magnetic disk, the spraying device sprays the cleaning liquid and the cleaning pad cleans the magnetic disk. A method is adopted that includes a step of wiping while supplying a solvent.

(f) Embodiments of the Invention Next, examples will be used to explain how the method for manufacturing a magnetic disk according to the present invention is actually implemented. The figures show the internal structure of an apparatus for cleaning and cleaning magnetic disks using the method of cleaning and cleaning magnetic disks according to the present invention. Figure 1 is a front view, Figure 2 is a left side view, and Figure 3 is a bottom view. . 1 A cleaning/cleaning room, which is almost sealed with an outer wall 2 to prevent washing water, solvents, etc. from scattering outside. Reference numeral 3 denotes a magnetic disk, which is automatically attached to and removed from the chuck portion 5 of the spindle 4 by a robot (not shown). Spindle 4 is
The rotation speed is controlled according to washing, drying and cleaning.

In the washing/cleaning chamber 1, a washing water injection device 10 is installed in order to wash/clean the magnetic disk 3.
Pads 6 such as porous sponge pads or brush pads and a wiping device 7 are built-in, and pairs of pads 6, such as porous sponge pads or brush pads, and a wiping device 7 are arranged facing each other so that both sides of the magnetic disk 3 can be washed and cleaned at the same time. Injection device 10
is arranged above the magnetic disk 3 with the injection port facing the magnetic disk 3, and
When cleaning the pad 6 and immediately after releasing the pad 6, warm water is injected to flush out the chips.

The pad 6 is attached to a swing shaft 9 via an arm 8, and during cleaning, as shown in FIG. When the disk 3 is attached or detached, it is evacuated to the position shown by the chain line so as not to get in the way. The pad 6 is connected by a belt to a drive motor M attached to an arm 9, and is rotated by the motor M. Further, by moving linearly in the axial direction, the swing shaft 9 moves the pad 6.
is pressed against the magnetic disk 3 or separated from the magnetic disk 3. Therefore, when attaching or detaching the magnetic disk 3 to the chuck portion 5, the swing shaft 9 moves in a direction to separate the pad 6 from the magnetic disk 3.
The pad 6 is made to float above the magnetic disk 3, and the arm 8 is further rotated to retreat to the position indicated by the chain line. When the magnetic disk 3 is attached to the chuck portion 5 in the retracted state, the swing shaft 9 rotates to move the pad 6 to a position in front of the magnetic disk 3 as shown by the solid line. Then, the swing shaft 9 moves in the axial direction to press the pad 6 against the magnetic disk 3, and then the motor M
The pad 6 is driven to rotate.

The wiping device 7 is connected to the left and right frame plates 11 and 1.
Kotton roll 1 with a Kotton obi wrapped between 2
3 and a rubber roll 16 are attached, and the strip 14 fed out from the strip roll 13 is wound up by a take-up roll 19 via a guide roll 15, a rubber roll 16, a pinch roller 17, and a guide roll 18. . Winding roll 1
9 and the cotton roll 13 are rotated by a drive motor (not shown). Also, guide roll 1
5 and the rubber roll 16, a pipe 20 is disposed in parallel thereto, and the solvent is supplied to the cotton strip 14 through injection holes made in the pipe 20.

Moreover, the wiping device 7 configured in this way is
It is driven in _{the two} directions of arrow a by an actuator such as an air cylinder (not shown). That is, when the magnetic disk 3 is attached to and removed from the chuck portion 5, it is retracted to the outside of the magnetic disk 3, and when wiping is performed, it is moved to a position in front of the magnetic disk 3 as shown by the chain line. Further, when the wiping device 7 is moved to a position in front of the magnetic disk 3, the entire wiping device 7 automatically moves toward the magnetic disk 3 and comes into pressure contact with the disk surface.

Next, the washing/cleaning operation will be explained. With the pad 6 and the wiping device 7 retracted, the magnetic disk 3 is attached to the chuck portion 5. Then, the magnetic disk 3 is driven by a spindle drive motor for 3000
Rotate at a high speed of ~4000rpm, injector 10 for 30
Spray warm water at ~60°C to wash away the chips. Next, the pad 6 is moved to the front of the magnetic disk 3 using the swing shaft 9, and rotated 100 to 200 times by the motor M.
Chips and the like adhering to the disk surface are peeled off and removed with or without spraying hot water. At this time, the pad 6 is pressed against the disk surface at about 1.6 to 2.5 kg/cm ² . Further, the higher the rotation speed of the pad 6, the better. A sponge such as a mold plane or a nylon brush is suitable for brushing such a wet surface, and a soft brush that has a large surface area and does not damage the surface of the magnetic disk is preferable.

After cleaning with the pad 6, the pad 6 is moved away from the magnetic disk 3 by the axial movement of the swing shaft 9, and the pad 6 is retracted out of the magnetic disk 3 by swinging the arm 8. Then, while the magnetic disk 3 is rotating at high speed, hot water is again injected to wash away the peeled chips.

Next, stop the hot water injection and set the magnetic disk 3 to 3500~
Rotate at a high speed of about 4200 rpm and use centrifugal force to shake off moisture and dry.

Thereafter, the rotational speed is lowered to about 1000 to 1500 rpm, and the wiping device 7 is moved to a position in front of the magnetic disk 3 as shown by the chain line using an air cylinder (not shown). And the winding roll 19,
The feed roll 13 and the rubber roll 16 are driven by a motor to supply a new surface of the cotton strip 14 to the rubber roll position, and a solvent is supplied from the pipe 20 over the entire width of the cotton strip 14 to soak it in the rubber roll 16. Then, the strip 14 is pressed against the magnetic disk 3. By wiping with a solvent in this manner, minute dirt, stains, and deteriorated layers are removed. The solvent used at this time is
perchlorethylene, isopropyl alcohol,
A mixture of percrene and isopropyl alcohol is suitable. Further, the pressing pressure of the cotton band 14 against the magnetic disk 3 is preferably about 0.6 to 1.4 kg/cm ² .

If the width of the strip 14 and the diameter of the pad 6 of the wiping device are smaller than the diameter of the magnetic disk 3, move the wiping device 7 and pad 6 on the surface of the magnetic disk to clean the entire surface of the magnetic disk 3. Make it possible to clean.

Cleaning and cleaning are completed by cleaning with a solvent, and the wiping device 7 is retracted from the magnetic disk 3 to the position shown by the solid line, and the magnetic disk 3 is removed from the chuck portion 5.

Based on this method, the rotational speed of the magnetic disk 3 is 1000 to 1500 rpm, the solvent is perchloren, a liquid with a mixing ratio of perchloren and isopropyl alcohol of 10:1, and the pressing pressure of the cotton band 14 is 0.6 to 1.4 kg/
cm ² , and the surface temperature of the magnetic disk 3 is 30 to 40 degrees Celsius.As a result, foreign matter such as chips can be reliably removed, and minute dirt and stains that could not be resolved with conventional methods can be removed. , processing-affected layers, etc., have definitely disappeared.

(g) Effects of the invention As described above, according to the present invention, in one room,
It is equipped with a cleaning water spraying device, a cleaning pad such as a sponge or brush, and a wiping device, and with the wiping device evacuated from the magnetic disk, after cleaning with hot water jetting and the cleaning pad, and shaking off to dry, A method is adopted in which a wiping device is brought into contact with the magnetic disk and the wiping is performed while supplying a solvent. Therefore, immediately after removing foreign substances such as chips, washing and drying, by wiping with a cotton cloth soaked in solvent in the same room, the removal of fine chips can also be done using the conventional drying process. It can also reliably remove dirt, dry stains from cleaning fluid, and deteriorated layers.

[Brief explanation of drawings]

The drawings are diagrams showing the internal structure of an apparatus for cleaning and cleaning magnetic disks by the method of cleaning and cleaning magnetic disks according to the present invention, in which Figure 1 is a front view, Figure 2 is a left side view, and Figure 3 is a bottom view. It is. In the figure, 1 is a cleaning/cleaning room, 3 is a magnetic disk, 4 is a spindle, 5 is a chuck, 6 is a pad, 7 is a wiping device, 8 is an arm, 10 is an injection device, 14 is a cotton strip, and 20 is a solvent Each supply pipe is shown.

Claims (1)

[Scope of Claims] 1. In the cleaning and cleaning process when manufacturing magnetic disks, a cleaning water spraying device, a cleaning pad such as a porous sponge pad or a brush pad, and a wiping device are provided in one room, With the wiping device retracted from the magnetic disk, spray the cleaning liquid with the spray device and clean with the cleaning pad, then retract the cleaning pad and bring the wiping device into contact with the magnetic disk, while supplying the solvent. A method for manufacturing a magnetic disk, comprising the step of wiping.