JPH0425367A - Texture device for magnetic recording medium - 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] [Summary] Relating to a texturing device for a magnetic recording medium that uses a pressure roller to press an abrasive tape against a rotating magnetic recording medium to create streaks in the magnetic recording medium. Processing conditions. The purpose of the present invention is to provide a texture device for magnetic recording media that is stable against fluctuations in temperature, does not cause scratches, and has a high processing rate.The pressure roller is coated with soft and hard rubber on the surface. Constructed to have a laminated lining.

[Industrial Field of Application] The present invention relates to a texturing device for a magnetic recording medium that presses an abrasive tape against a rotating magnetic recording medium using a pressure roller to create streaks in the magnetic recording medium.

[Prior Art] Next, a conventional example will be explained using the drawings. FIG. 8 is a perspective view illustrating the overall structure of the texture device, and FIG. 9 is a sectional view of the pressure roller in FIG. 8.

First, the overall configuration of the tape polishing apparatus will be explained using FIG. 8. In the figure, 1 is a substrate (magnetic recording medium) that is rotationally driven by a drive device (not shown). Reference numeral 2 designates a supply reel for the polishing tape 3, and reference numeral 4 designates a take-up reel that is rotationally driven by a drive motor (not shown) and winds up the polishing tape unwound from the supply reel 3.

5 is a guide roller that guides the polishing tape 3 fed out from the supply reel 2 toward the substrate 1, and 6 is a pressure roller that presses the polishing tape 3 toward the substrate 1 by a pressure mechanism to be described later. Reference numerals 7 and 8 denote a capstan and a pinch roller that sandwich the polishing tape 3 and drive the polishing tape 3 at a constant speed.

Reference numeral 9 denotes a nozzle for supplying polishing liquid and cooling lubricant to the vicinity of the contact portion between the polishing tape 3 and the substrate l.

Next, the pressure roller 6 will be explained using FIG. 9. In the figure, 11 is a metal core roller, and 12 is a urethane rubber lined on the core roller 11 and has a hardness of 40 to 50 degrees.

Next, the operation of the above configuration will be explained. The substrate 1 is rotated by a drive motor (not shown). The polishing tape 3 is then wound onto the take-up reel 4 at a constant speed by the capstan 7 and the pinch roller 8. Further, the polishing tape 3 is pressed toward the substrate 1 by a pressure roller 6.

Furthermore, the polishing liquid and cooling lubricant are applied to the polishing tape 3 from the nozzle 9.
is supplied near the contact portion between the substrate 1 and the substrate 1.

In this way, the substrate 1 is polished.

[Problems to be Solved by the Invention] When urethane rubber with low hardness is used in the pressure roller having the above configuration, a footprint with a large area is obtained as shown in FIG. 10(a).

Here, the footprint is the mark left on the substrate 1 by the contact surface of the polishing tape 3 when the pressure roller 6 is in a pressurized state, fixes the substrate 1, and drives the polishing tape 3. .

In such a case, since the pressure per unit area is low, there may be fluctuations in the quality of the polishing tape 3, differences in circumferential speed between the inner and outer diameters of the rotating substrate 1, and processing conditions such as pressing force. Although it is also possible to perform uniform polishing, there is a problem that the processing rate is low.

On the other hand, if urethane rubber with high hardness is used, Figure 10 (
As shown in b), a sharp footprint is obtained. In this case, the pressure per unit area is high, so
Although the processing rate is high, there are problems in that the substrate 1 is likely to be scratched and the surface roughness tends to be deep in the four parts.

The present invention has been made in view of the above problems.
The aim is to provide a texturing device for magnetic recording media that is stable against fluctuations in processing conditions, is less likely to cause flaws and scratches, and has a high processing rate.

[Means for Solving the Problems] FIG. 1 is a diagram showing the principle of the present invention. In the figure, 21 is a rotating magnetic recording medium, and 22 is a pressure roller 23, which is an abrasive tape that is pressed against the magnetic recording medium 21 by the pressure roller 22.

The surface of the pressure roller 22 is lined with a laminated layer of soft rubber 24 and hard rubber 25.

In addition, in this principle diagram, the soft rubber 2 is placed on the hard rubber 25.
4 is shown in the figure, but the reverse may be used.

[Function] In the texturing device for a magnetic recording medium shown in FIG.
The magnetic recording medium 21 is streaked by being pressed by a pressure roller 22 whose surface is laminated and lined with rubbers 24 and 25 having different hardnesses.

Then, when the polishing tape 23 is pressed by the pressure roller 22, the soft rubber 24 is deformed, and is stable against fluctuations in processing conditions, less likely to generate flaws and scratches, and has a higher processing rate.

[Example] Next, an example of the present invention will be described using the drawings. Second
The figure is a sectional view of a pressure roller showing a first embodiment of the present invention.
Figure 3 is a diagram explaining the surface roughness when polishing is performed with the pressure roller shown in Figure 2, and Figure 4 is a diagram explaining the surface roughness when polishing is performed with the conventional pressure roller. , Figure 5 is the second
FIG. 6 is a cross-sectional view of the pressure roller showing the second embodiment of the present invention; FIG. The figure is a diagram illustrating the surface roughness when polishing is performed using the pressure roller shown in FIG. 6.

First, a first embodiment of the present invention will be described using FIGS. 2 to 5. In this embodiment, the only difference from the conventional example is the pressure roller, so only the pressure roller will be described below.

In the figure, 41 is a pressure roller. This pressure roller 41 is constructed by first lining the cylindrical surface of a metal core roller 42 with a soft rubber 43 having a thickness of 4.0 mm (hardness 40'), and then lining the surface of this rubber 43 with a hard rubber 43 having a thickness of 1.2 mm. It is lined with rubber 44 (hardness 40").

When a magnetic recording medium is polished using the pressure roller 41 having such a structure and a polishing tape having an average particle size of 5 μm, the result is as shown in FIG. 3. On the other hand, with the conventional pressure roller, the average particle size is 5.
When a magnetic recording medium is polished using a μ-polishing tape, the result is as shown in FIG. Comparing these two figures, when using a conventional pressure roller, the surface roughness is uneven, especially in the four parts (corresponding to scratches), which are deep, but in this example, the uneven surface roughness is particularly deep. It can be seen that in the case of polishing using the pressure roller 41, the protrusions of the four parts of the surface roughness are reduced, and the number of flaws and scratches is reduced.

Further, the machining rate when polishing is performed using the pressure roller 41 of this embodiment and the conventional machining roller is as shown in FIG. The conditions for main polishing are as follows: Type of processing tape - Alumina oxide abrasive grain (νA) Average center abrasive grain: 3μ Processing rotation speed: 200rpI11 Processing substrate, N1-P plated substrate processing pressure
; 2.2Kg/each 5ide] Tape feed; ■, ■ 400mm/min■ 600mo+/
The min diagram shows that the use of the pressure roller 41 of this embodiment significantly increases the machining rate.

According to the above configuration, a large contact surface is obtained by deforming the soft rubber 43, and the abrasive grains of the polishing tape are pressed against the magnetic recording medium with a large force by the hard rubber 44. Therefore, as explained with reference to FIGS. 3 to 5, it is stable against fluctuations in processing conditions, prevents flaws and scratches, and has a high processing rate.

Next, a second embodiment of the present invention will be described using FIGS. 6 and 7. Note that this embodiment also differs from the conventional example only in the pressure roller, so only the pressure roller will be described below.

In the figure, 51 is a pressure roller. This pressure roller 51 is constructed by lining the cylindrical surface of a metal core roller 52 with hard rubber 53 (hardness 606) having a thickness of 4.0 +++ m, and then lining the surface of this rubber 53 with a soft rubber (hardness 606) having a thickness of 06 mm.
It is lined with rubber 54 having a hardness of 40°.

When a magnetic recording medium is polished using the pressure roller 51 having such a structure and a polishing tape having an average particle size of 5 .mu.m, the result is as shown in FIG.

Even in the case of polishing using the pressure roller 51 of this embodiment, there is no protrusion of the recesses in the unevenness of the surface roughness.
It can be seen that the number of scratches and scratches has decreased.

According to the above configuration, the soft rubber 54 acts as a buffer material to prevent scratches and scratches that are likely to occur with the hard rubber 53, and can be oxidized as in the first embodiment.

[Effects of the Invention] As explained above, according to the present invention, the surface of the pressure roller is configured to have a laminated lining of soft and hard rubber. It is possible to realize a texturing device for magnetic recording media that is less likely to cause scratches and scratches and has a high processing rate.

[Brief explanation of drawings]

Fig. 1 is a diagram of the principle of the present invention, Fig. 2 is a sectional view of a pressure roller showing the first embodiment of the invention, and Fig. 3 is a diagram showing the state of the pressure roller after polishing as shown in Fig. 2. Figure 4 is a diagram explaining the surface roughness when polishing is performed using a conventional pressure roller. Figure 5 is a diagram explaining the surface roughness when polishing is performed using the pressure roller shown in Figure 2 and the conventional pressure roller. Figure 6 is a sectional view of a pressure roller showing the second embodiment of the present invention, Figure 7 is a diagram illustrating the processing rate when polishing is performed with the pressure roller shown in Figure 6. Figure 8 is a perspective view illustrating the overall structure of the texture device; Figure 9 is a sectional view of the pressure roller in Figure 8; Figure 10 is a conventional It is a figure explaining the footprint by a pressure roller. 1 to 7, 21 is a magnetic recording medium, 22, 41, 51 is a pressure roller, 23 is an abrasive tape, 24, 43, 54 is a soft rubber, and 25, 44, 53 is a hard rubber.

Claims (3)

[Claims] (1) A texturing device for a magnetic recording medium that uses a pressure roller (22) to press an abrasive tape (23) against a rotating magnetic recording medium (21) to create streaks in the magnetic recording medium (21). A texturing device for a magnetic recording medium, characterized in that the surface of the pressure roller (22) is lined with a laminated layer of soft and hard rubber (24, 25). (2) The texture device for a magnetic recording medium according to claim 1, wherein the pressure roller is lined with a hard rubber laminated on a soft rubber. (3) The texturing device for a magnetic recording medium according to claim 1, wherein the pressure roller has a laminated lining of soft rubber on hard rubber.