JPS58121130A - Magnetic disk manufacturing method - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for manufacturing a magnetic disk, and more specifically, a method for manufacturing a magnetic disk in which a burnishing process and a fluting check process are performed after forming a magnetic coating film on the surface of a substrate. Regarding improvement of the burnishing process ◎ A magnetic disk is used as a recording medium in a magnetic disk device.The magnetic disk mounted on a magnetic disk device rotates at a predetermined number of rotations, and the air flow generated by this rotation drives the magnetic head. Recording and reproduction are performed by floating the entire minute I1 gap. Therefore, if there are protrusions on the surface of the magnetic disk caused by the magnetic coating itself or by adhesion of foreign matter such as dust, the stability of the magnetic head when flying will be affected, and in the worst case In this case, a so-called head crash phenomenon occurs in which the magnetic coating film on the surface of the magnetic disk and the magnetic head are damaged.

In conventional methods for manufacturing magnetic disks, the process team adds a burnishing process to remove protrusions on the pre-magnetic coating film using a special simulated head to ensure smoothness. Various shapes have been devised. In addition, in order to check whether the protrusions have been removed in the burnishing process, a magnetic head used in an actual magnetic disk device is used to levitate the magnetic head at the actual value or a slightly smaller flying height. A 7N2-ting check process (t-ff) is carried out in which a protrusion detection sensor is mounted on this to inspect the smoothness, and the protrusion detection sensor used in this process is also being studied.

Regarding the protrusion motion detection sensor used in this o-ting check process, there is a tendency to adopt a sensor with higher sensitivity to the flying height of the magnetic head, which is decreasing as the needle arrangement density of the magnetic disk becomes higher. The problem here is that when using a highly sensitive protruding motion detection sensor like the one mentioned above,
Because it detects deposits or settled dust that could not be detected with conventional sensors, it is difficult to distinguish between true protrusions (as mentioned above, protrusions caused by the magnetic coating itself). It is. That is, in the above-mentioned barking state, more protrusions are detected than the true number of protrusions, which unnecessarily reduces the entire production quota for magnetic disks. Even if the processing using the simulated head used in the conventional burnishing process was repeated, the above-mentioned deposits or settled dust could not be removed.

The present invention has been made in view of the above circumstances, and its purpose is to eliminate the above-mentioned @M in the conventional magnetic disk manufacturing method and to detect mere deposits and settled dust #*. An object of the present invention is to provide a method for manufacturing a magnetic disk having a preventable burnishing process.

The above-mentioned object of the present invention is to provide a magnetic disk manufacturing method in which a magnetic coating film is formed on the surface of a substrate, and then a burnishing process and a 70-ting check process are performed. This is achieved by a method of manufacturing a magnetic disk characterized in that the burnishing heads are all arranged to act alternately.

Embodiments of the present invention will be described in detail below with reference to the drawings.

Figure #1 is a front view of a head 4 with a large load (hereinafter referred to as "heavy load head") among the simulated heads used in the burnishing process of the present invention, and the heavy load slider 2 has a load of about 15 cm by one spring. The total load in grams is given. Also,
Figure 2 shows the same material used in the burnishing process of the present invention *i
It is a front view of a head 5 with a small load among the heads (hereinafter referred to as a "light load head"), in which three light load sliders are given a load of about 15 grams by a spring IB,
The check slider 3B is given a load of approximately 10 duram by a spring la.

3 and 4 are configuration diagrams of an apparatus for carrying out the burnishing process of the present invention, with FIG. 3 being a top view, and FIG. 4 being a side view and a pull diagram showing the configuration of the control section. Heavy load head 4
The light load head 6 is mounted on carriages 7A and 7B that are each independently operated by a pulse motor 6, and burnishes a magnetic disk 9 rotating in the direction of arrow R.

At this time, the heavy load head 6 is used to burnish once or twice, and then the light weight head 6 is used once to burnish.

This light load head δ is equipped with a check slider 3B for detecting protrusions, and the carriage 7B
On the return trip of the reciprocating movement, the detection sensor 10 detects all the protruding movements,
This detection signal is amplified by all the amplifiers 11 and sent to the signal processing section 12 for signal processing, and the position of the protrusion is fully calculated and counted, and the results are outputted to all the printers 14. Then, based on this result, the above-mentioned process is repeated, and the process is terminated when the number of protrusions falls within the range of the furnace.
Figures 6 and 7 are diagrams comparing the effects of various burnishing processes. Figure 5 is the case where all burnishing is performed with only the heavy load head, and Figure 6 is the case where the burnishing is performed with only the light load head. FIG. 7 shows a case where a burnishing process according to the present invention is performed in which a heavy load head and a light load head are applied alternately.

If burnishing is performed only with the heavy-load head shown in Figure 6, deposits or precipitated In cannot be removed.
The number of detected protrusions does not fall below a certain number. If burnishing is performed using only the light load head shown in Figure 6, protrusions caused by the magnetic coating film of the magnetic disk will remain.
After all, the number of detected protrusions does not fall below a certain number. On the other hand, the combination of burnishing by a heavy-load head and burnishing by a light-load head as shown in Fig. 7 (where each burnish 't-1 time is considered to be one cycle), and the horizontal axis shows the number of cycles. ), 2
The number of protrusions detected during the cycle was O, which fully demonstrates the great effects of the present invention.

In the above embodiment, the light load head b is equipped with three light load sliders for vanishing and a check slider 3B for detecting protrusion movement, and is configured to move by one carriage 7B. Needless to say, each may be mounted on a dedicated carriage.

As described above, according to the present invention, the substrate surface has magnetic
After forming 111g, in the method of using magnetic disk 1, which performs a burnishing process and a 70-ting check process, two or more types of burnishing -\rads having different total loads on the burnishing culm are alternately applied. With this structure, it is possible to grasp the true number of protrusions, thereby achieving the WI41L effect of making it possible to produce magnetic disks of stable quality.

[Brief explanation of the drawing]

FIGS. 1 and 2 show that the method of the present invention is applied to vanish T.
FIG. 3 is a front view of the head used for il. FIG. 4 is a diagram showing the vanishing process flfk, and FIGS. 6 and 7 are diagrams comparing the effects of various vanishing processes. LA, IBI 1a: Spring, 2: Heavy load slider, 3
A: @Load slider, 3B: Check slider, 4:
Heavy load head, 5 light load head, 6: Pulse motor, 7A, 7B: Carriage, 8: Nozzle motor control section, 9: Magnetic disk, 10: Detection sensor, 11: Amplifier, 12: Signal processing section, 13 counter, 14: printer, 1
5 - Largest circle patent for rotational speed detection Hitachi, Ltd. Figure 1 Figure 3 Figure 4 Figure 5 Figure 7 Vanish cycle repetition rate - Figure 6

Claims (1)

[Claims] Burnishing after forming a magnetic coating film on the surface of a substrate. A method for manufacturing a magnetic disk, which comprises a uni process and a floating check process, characterized in that two or more types of burnishing heads, which generate the burnishing force and the load, are configured to act alternately. Production method.