JPH01266882A - System of working coated film of magnetic disk - Google Patents

Abstract

PURPOSE:To additionally improve working accuracy by constituting the system in such a manner that at least either of the moving speed of a pressing head in the radial direction of a magnetic disk or the feed speed of a polishing tape in addition to the rotating speed of the magnetic disk can be varied and control ling these speeds. CONSTITUTION:A revolving shaft 2 is revolved by operating a motor 3 for rotation and the polishing tape 4 is fed by operating a take-up motor 10. The pressing head 5 is moved toward the radial direction of the magnetic disk 1 by operating a head moving motor 13. The movement of the head 5 is detected by an encoder 14 an the signal relating to the position of the head 5 is inputted to a control circuit. The results of the computations of the rotating speeds of the respective motors 3, 10, 13 based on the input signal are inputted to respective controllers. The rotating speeds of the motors 3, 10, 13 are changed in accordance with such input signals, by which the rotating speed of the disk 1, the feed speed of the tape 4 and the speed of the head 5 are changed.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Yf1] The present invention relates to a method for performing coating processing such as burnishing after forming a magnetic coating on a magnetic disk.

[Prior Art 1] A magnetic disk is formed by forming a magnetic film on the surface of a disc-shaped substrate made of aluminum or the like, and is widely used as an information recording medium. After forming a magnetic coating on this magnetic disk, it is necessary to polish the surface to make it completely smooth. In order to perform this polishing process, an abrasive tape is used, a magnetic disk is mounted on a rotating shaft and rotated, and while the magnetic disk is rotating, the abrasive tape is pressed against the surface of the magnetic disk.
A commonly used method is to move the abrasive tape in the radial direction of the magnetic disk.

Here, when the magnetic disk is rotated, there is a difference in the circumferential speed between the outer circumferential side and the inner circumferential side, so if the rotational speed of the magnetic disk is kept constant, machining unevenness will occur. It turns out. For this purpose, the rotational speed of the magnetic disk is set to be low when the abrasive tape is in contact with the outer circumferential side, and the rotational speed of the magnetic disk is set to increase as the abrasive tape moves to the inner circumferential side. What you did is
It has been known for a long time.

[Problem to be solved by the invention 1] Incidentally, in recent years, due to the demand for higher storage density in magnetic disks, it has become necessary to more strictly control the thickness of the recording film. and
If the rotational speed of the magnetic disk is varied as in the prior art described above, there is a limit to the uniformity of processing.

The present invention has been made in view of the above, and an object of the present invention is to provide a coating film for a magnetic disk that is capable of extremely accurately controlling the contact conditions of the abrasive tape on the entire surface of the magnetic disk. The objective is to provide a new method.

[Means for Solving the Problems 1 if■ In order to achieve the above-mentioned object, the present invention makes the rotational speed of the rotating shaft variable, and the pressing spatula I-
At least one of the moving speed of the magnetic disk and the winding speed of the polishing tape is made variable, and the rotational speed of the pressing head is increased by 1 as it goes from the outer circumferential side to the inner circumferential side of the magnetic disk, and at the same time, It is characterized in that the moving speed of the pressing head is increased from the outer circumferential side toward the inner circumferential side, or the feeding speed of the abrasive tape is decreased from the outer circumferential side toward the inner circumferential side. be.

[Function] As mentioned above, not only the rotational speed of the magnetic disk but also
In addition, by making at least one of the moving speed of the pressing head in the radial direction of the magnetic disk or the feeding speed of the abrasive tape variable and controlling these, it is possible to further improve the pressing accuracy. Become.

1 Embodiment Hereinafter, embodiments of the present invention will be described in detail based on the drawings.

First, FIG. 1 shows the overall structure of a magnetic disk coating bag ml.

In the figure, 1 indicates a magnetic disk, the magnetic disk 1 is attached to a rotating shaft 2, and the rotating shaft 2 is rotationally driven by a rotating motor 3. A polishing tape 4 is used to polish the coating film on both sides of the magnetic disk 1 from both sides, and a pressing pad 5 is provided to press the polishing tape 4 against the magnetic disk 1. The abrasive tape 4 is then unwound from the supply reel 6, passes between the guide rollers 7, 7, the pressing head 5, the guide rollers 8,
It is adapted to be wound up by a winding shaft 9 from between 8 and 8. A tape winding motor 10 is attached to this winding shaft 9.
are connected so that the abrasive tape 4 can be fed by the tape winding motor 10.

Further, the pressing head 5 is attached to a reciprocating block 11, and the reciprocating block 11 is reciprocated in the radial direction of the magnetic disk 1 by a ball screw 12 and a head moving motor 13 that rotates the ball screw 12. It is now possible to do this. In order to detect the position of this reciprocating flock 11, an encoder 14 is provided.

Here, a rotation motor 3. for rotating the rotation shaft 2 described above is used. A take-up motor 10 for feeding the abrasive tape 4 and a tape moving motor 13 for moving the pressing tape 5 are both constituted by variable speed motors.

Then, as shown in FIG. 2, the position of the pressing head 5 is detected by the encoder 14, and this encoder 1
By inputting the signal from 4 to the control circuit 15,
The control circuit 15 performs predetermined calculations and inputs speed control signals to the respective controllers 16 to 18, and these controllers 16 to 18 control the motors 3, 10.1:
The rotation speed of l is controlled.

The magnetic disk coating processing apparatus according to this embodiment is constructed as described above. Next, a method of polishing the coating film of the magnetic disk 1 using this coating film processing apparatus will be described.

First, the magnetic disk 1 is mounted on the rotating shaft 2, the polishing tape 3 is brought into contact with both surfaces of the magnetic disk 1, and the polishing tape 3 is pressed against the surface of the magnetic disk 1 by the pressing head 5. This polishing tape 3 is placed on the outer peripheral side of the magnetic disk 1.

Therefore, the rotation motor 3 is activated to rotate the rotating shaft 2, the take-up motor 10 is activated to feed the abrasive tape 4, and the head movement motor 13 is activated to move the polishing tape to the pressing field. 5 inward in the radial direction of the magnetic disk 1. The movement of the pressing head 5 is detected by the encoder 14, and a signal from the encoder 14 regarding the position of the pressing head 5 is input to the control circuit 15. Then, in the control circuit 15, each motor 3, 10.13
calculates the rotational speed of each motor 3, inputs it to each controller 16 to 18 based on this calculation result, changes the rotational speed of each motor 3 by +0.1:l based on this input signal,
The rotational speed of the magnetic disk 1, the feeding speed of the polishing tape 4, and the moving speed of the pressing pad 5 can be changed.

As is clear from FIG. 2, the rotational speed of the magnetic disk 1 is slowest when it is at the outermost position of the pressing pad 5, and increases rapidly as it moves toward the inner circumference. do it like this. Further, the movement of the pressing head 5 is slowest when it is at the outermost circumferential position;
The moving speed is increased toward the inner circumference.

Further, the feeding speed of the polishing tape 4 is made to decrease continuously from the outer circumferential side to the inner circumferential side of the pressing pad 5. As a result, the contact time of the abrasive tape 4 with the magnetic disk 1 and the circumferential speed of the abrasive tape 4 with respect to the surface of the magnetic disk 1 are constant, and the entire magnetic disk 1 can be processed uniformly.

In the embodiment described above, the rotational speed of the magnetic disk 1, the feeding speed of the polishing tape 4, and the
・! The rotating speed of the magnetic disk 1 is made variable, and the feeding speed of the polishing tape 4 or the moving speed of the polishing pad 5 is made variable. By making either one of the speeds variable, it becomes possible to uniformize the processing of the magnetic disk 1. For example, when the magnetic reading head is stopped and the inner peripheral side of the magnetic disk where the magnetic reading head is located is processed to be different from other positions, the above-mentioned elements 2 to 3-) can be applied. By making variable, it becomes possible to smoothly perform such irregularities.

[Effects of the Invention] As explained above, according to the present invention, the rotating speed of the magnetic disk, the feeding speed of the polishing tape, and the pressing spatula l
Among the three elements of the moving speed, at least two of the rotating speed of the magnetic disk and either the polishing tape feeding speed or the pressing head moving speed are made variable. It becomes possible to significantly improve the processing accuracy of magnetic disks.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention, and FIG. 1 is an explanatory diagram of the configuration of a magnetic disk polishing apparatus, and FIG. 2 is an explanatory diagram showing the control circuit thereof together with respective speed characteristic diagrams. 1: Magnetic disk, 2: Two rotating shafts, 3: Rotating circular motor, 5: Pushing head, 6: Supply reel, 9:
Winding shaft, 10: Winding motor, 11: Reciprocating flock, 1
22 ball screws, 13 head movement motor, 14:
Encoder, 15: Control circuit, 16-18: Controller.

Claims (5)

[Claims] (1) A magnetic disk is mounted on a rotating shaft, and while the rotating shaft is rotating, an abrasive tape is pressed against the surface of the magnetic disk by a head, and the pressing head is moved in the radial direction of the magnetic disk. However, in a device that polishes the surface of the magnetic disk by feeding the polishing tape, the rotation speed of the rotating shaft is made variable, and the speed of movement of the pressing head or the winding speed of the polishing tape is adjusted. At least one of them is made variable, and the rotational speed of the pressing head is increased as it goes from the outer circumferential side to the inner circumferential side of the magnetic disk, and at the same time, the pressing head is moved from the outer circumferential side to the inner circumferential side. A coating film processing method for a magnetic disk, characterized in that the speed is increased or the feeding speed of the abrasive tape is decreased from the outer circumferential side toward the inner circumferential side. (2) The entire surface of the magnetic disk is processed with equal processing density by making the rotational speed of the magnetic disk and the winding speed of the abrasive tape variable. Coating film processing method for magnetic disks. (3) The entire surface of the magnetic disk is processed with equal processing density by making the rotational speed of the magnetic disk, the pressing head, and the winding speed of the polishing tape variable. A coating film processing method for a magnetic disk according to claim (1). (4) The method according to claim (1), characterized in that by making the winding speed of the abrasive tape variable, a predetermined portion of the surface of the magnetic disk is processed at a higher density than other portions. Coating film processing method for magnetic disks. (5) By varying the rotational speed of the magnetic disk, the winding speed of the abrasive tape, and the winding speed of the abrasive tape, a predetermined portion of the surface of the magnetic disk is made more flexible than other portions. The coating film processing method for a magnetic disk according to claim 1, characterized in that the processing density is increased.