JPS6076954A - Magnetic disc polishing device - Google Patents

Abstract

PURPOSE:To prevent excessive polishing at the start thus to achieve uniform polishing by controlling the speed through a moving speed controller upon reaching of pinch roller to a magnetic disc to contact the polishing tape against the magnetic face of disc. CONSTITUTION:Upon rotation of a magnetic disc 5 to exchange the valves 25, 30, air cylinders 22, 23 will function to move the pistons 22a, 23a with low speed to be set by speed controllers 26, 31. The pinch rollers 18, 20 will lift and lower with speed corresponding with those of pistons 22a, 23a to catch the polishing tapes 14, 15 and contact simultaneously against the upper and lower faces of disc 5 while clamping the magnetic disc 5 thus to contact side tapes 14, 15 without shock. Upon contact of pinch rollers 18, 20 against the disc 5 to restrict motion, the pistons 22a, 23a are applied with force to be determined by the dimension and hydraulic pressure of cylinders 22, 23 to maintain the rollers 18, 20 in such state as to press the surface of disc 5 with predetermined force resulting in uniform polishing.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a magnetic disk polishing apparatus for polishing the magnetic surface of a magnetic disk in a magnetic disk manufacturing process.

A magnetic disk 1 incorporated into a conventional Winchester type disk device is rJ after going through the steps shown in FIGS.
J is built. First, a special aluminum substrate 2 with a polished surface as shown in the figure (△) is prepared, and magnetic films 3 and 4 are formed on the top and bottom surfaces by coating with magnetic paint as shown in the figure (B). , a coated magnetic disk 5 is obtained. Next, this coated magnetic disk 5 is mounted on a polishing device, and the surfaces of the magnetic films 3 and 4 are polished using a polishing tape.
The surface roughness and film thickness are controlled to form magnetic films 3A and 4A as shown in FIG. In this case, the polishing is performed in order to (1) increase the surface roughness of the magnetic film to 0.02 μm or less, and (2) make the film thickness a predetermined thickness of about 1 μm and constant over the entire surface.

A conventional magnetic disk polishing device is equipped with a pinch roller at the tip of a rod of a plunger solenoid that locks and guides the back side of the polishing tape to bring the polishing tape into contact with the magnetic disk, and a compression coil spring for pressing is installed around the rod. It has a structure in which it is fitted with When the plunger solenoid is turned off to start polishing, the pinch roller is moved downward by the spring force of the compression coil spring to press the polishing tape against the magnetic disk. The abrasive tape runs while being pressed against the magnetic disk with a constant force, and abrasion is performed.

Problems to be Solved by the Invention At the start of polishing S, the pinch roller moves downward forcefully due to the spring force of the compression coil spring, and an impact force is applied when the polishing tape comes into contact with the magnetic disk. For this reason,
The part where the polishing starts will be excessively polished), making it difficult to finish the entire magnetic surface well and uniformly.

Means for Solving the Problems Therefore, an object of the present invention is to provide a magnetic disk polishing device that solves the above problems. In a magnetic disk polishing device for polishing the magnetic surface, a movement speed control means capable of controlling the speed at which the pinch roller approaches the magnetic disk and brings the polishing tape into contact with the magnetic surface of the magnetic disk. This configuration is provided with a binge roller suppressing means.

Embodiment FIG. 2 shows an embodiment of a magnetic disk ωI polishing apparatus according to the present invention. In this magnetic disk polishing device 10, 5
1 (B), which is the object to be polished, is a coated magneto-rheic disk shown in FIG. .

14 is an upper abrasive tape, 15 is a lower abrasive tape,
It is mounted above and below the magnetic disk 5 fixed to the motor spindle 12. 14a.

15a is an abrasive tape winding on the supply side, and 14b and 15b are abrasive tape windings on the winding side. Reference numerals 16 and 17 designate pinching drive mechanisms consisting of pinch rollers and capstans for driving and running the abrasive tapes 14 and 15, respectively.

Reference numeral 18 denotes a pinch row, which is rotatably supported by a rotary support portion 19, and locks the abrasive tape 14 during downward movement to bring it into contact with the upper surface of the magnetic disk 5. Reference numeral 20 designates another pinch roller, which is rotatably supported by a rotary support portion 21 and locks the abrasive tape 15 during upward movement to bring it into contact with the lower surface of the magnetic disk 5. The pinch rollers 18 and 20 are arranged in a vertical plane passing through the diameter of the magnetic disk 5 and parallel to the disk surface.

22.23 is a piston 22a inside the main body.

23a is an air cylinder configured to reciprocate using compressed air, and is installed vertically, with a rotary support portion 19.23a at the lower end of the rod 22b. The rotation support part 21 is fixed to the upper end of the rod 23b.

Regarding the air cylinder 22, the compressed air source 24° switching valve 2
5. Speed controller 26. Piping 27, 28, etc. are provided. The speed controller 26 is the variable throttle valve 2
6a is installed in the middle of the piping 27, and controls the amount of compressed air flowing into the upper chamber of the cylinder to control the downward movement speed of the piston 22a. It has been adjusted. Another air cylinder 23
Similarly to the above, there are two compressed air sources.

Switching valve 30. Speed controller 31. Piping 32.3
3rd prize is provided. The speed controller 31 has a built-in variable throttle valve 31a similar to the above, and is installed in the middle of the piping 32 to control the amount of compressed air flowing into the lower chamber of the cylinder and move it above the piston 23a. It controls the speed and is adjusted appropriately.

Further, the air cylinders 22 and 23 mentioned above are at a stage before moving through a full stroke, that is, the piston 22a.

The pinch rollers 18 and 19 are pressed against the magnetic disk 5 before the stopper 23a is locked.
The mounting position has been adjusted and installed.

Next, the operation of the device M10 having the above configuration will be explained.

For the stage before mounting the magnetic disk 5 on the motor spindle 12, the piston 22a in the air cylinder 22.23
, 23a are moving upward and downward, respectively, and the pinch roller 1
8 is located at the raised position shown by the two-dot chain line, and the pinch roller 2
o is located in the lowered position. Abrasive tape 1'4.15
are separated from each other in a vertical manner. In this state, the magnetic disk 5 is mounted on the motor spindle 12 and rotated in the direction of the arrow.

When the switching valves 25 and 30 are switched as shown in Fig. 2,
Air cylinders 22 and 23 each have a speed controller 2
The pistons 22a and 23a operate by being supplied with compressed air through the speed controller 26.31.
Move at a slow speed set by . pinch roller 1
8 and 2o descend and rise at speeds corresponding to the pistons 22a and 23a, respectively, and simultaneously contact the upper and lower surfaces of the magnetic disk 5 in such a way as to clamp the magnetic disk 5 with the magnetic tape 14, 15 in between. . Polishing tape 14
．． 15 contacts the upper and lower surfaces of the magnetic disk 5 with almost no impact. 'When the vinyl rows 18 and 20 come into contact with the magnetic disk 5 and their movement is restricted (Subiton 22a).

23a stops moving), the piston 22a.

A force determined by the diameter dimensions of the air cylinders 22, 23 and the pressure of compressed air acts on the pinch rollers 18.23a.
Thereafter, the magnetic disk 20 is maintained in a state where it presses the surface of the magnetic disk 5 with a constant force.

Abrasive tape 14. -15, after contacting the surface of the magnetic disk 5, is pressed against the surface of the magnetic disk by the pinch rollers 18, 20 with a constant force. In addition, the polishing tape 14
．． ．． 15 are arrows B,
The magnetic disk 5 is moved in the C direction, and a new polished surface is always provided on the magnetic disk 5.
acts on the surface of

To polish the surfaces (magnetic surfaces) of the magnetic films 3 and 4 of the magnetic disk 5, as described above, while the magnetic disk 5 is rotating in the direction of the arrow claw, the running polishing tape 14, 15 is moved by the biting roller 18. 19 to press the surfaces of the magnetic films 3 and 4, and the pinch rollers 18 and 20 and the abrasive tape 14
．． 15 in the radial direction of the magnetic disk 5. For polishing, the switching valves 25 and 30 are switched to operate the air cylinders 22 and 23 in the opposite direction to the above, raising the pinch roller 18 and lowering the pinch roller 20.
The process is finished by separating the polishing tape 14, 15 from the surface of the magnetic disk 5.

In the case of the polishing apparatus 10 of this embodiment, the polishing tape 14.
Since the tape 15 contacts the surface of the magnetic film 3.4 without impact, it is not polished excessively at the start of polishing, and the pressing force of the polishing tape 14.15 is kept constant after contact. The surfaces of the magnetic films 3 and 4 of the disk 5 are uniformly polished over the entire surface to obtain the desired good magnetic films 3A and 4.
Δ is obtained.

Note that the disk polishing apparatus 10 described above is not provided with any sensor, such as a sensor for detecting the contact of the pinch roller with the disk, and thus has a simple configuration.

Next, regarding another embodiment of the device of the present invention, FIGS.
This will be explained with reference to the figures. In each figure, parts corresponding to those shown in FIG. 2 are designated by the same reference numerals, and their explanations will be omitted. This magnetic disk polishing device 140 includes a motor 41,
42 rotates binions 43 and 44, respectively, to move racks 45 and 46, and move pinch rows 518 and 20 up and down. Also motor 4.1.42
Braking Nli clutches 47 and 48 are provided in the rotation transmission path leading to the pinions 43 and 44.

As shown in FIG. 4, the braking electromagnetic clutch 47 has four flanges: a flange 49 fixed to the motor shaft 41a, a flange 50 fixed to the binion shaft 43a, and a flange 50 fixed to the flange 50. The motor shaft 41a and the pinion shaft i4.3a are magnetically coupled by the magnetic field generated when the electromagnetic coil 51 is applied with a voltage, and when the torque is below a predetermined torque, the pinion shaft 43
The motor shaft 41a rotates integrally with the motor shaft 41a without slipping, and slips when a predetermined torque is exceeded. The torque that causes the slip in this step 1 applies the pressing force of the abrasive tape 14 to the magnetic disk 5 by the pinch roller 18, and is determined by the voltage applied to the electromagnetic coil 51 by the voltage control circuit 52. is adjusted so that the pinch roller 18 can apply a predetermined pressing force.

Further, the rotational speed of the motor 41 is controlled by a motor control circuit 53. The rotational speed of the motor determines the speed at which the pinch roller 18 descends. Therefore, the motor control circuit 5 sets the motor 41 to a rotational speed such that the pinch roller 18 comes into contact with the magnetic disk 5 with almost no impact.
3.

During polishing, the motor 41 rotates under the control of the motor control circuit 53, and this rotation is transmitted via the braking electromagnetic clutch 47, converted into linear motion by the pinion 43° rack 45, and the pinch roller 18 is lowered at a low speed. Then, the abrasive tape 14 contacts the magnetic disk 5 without any impact. The motor 41 continues to rotate after that, the braking electromagnetic clutch 47 slips, and the pinch roller 18 (
The polishing tape 14) is applied with a pressing force determined by the transmittable torque of the braking electromagnetic clutch 47), and in this state, polishing is performed evenly as in the above case,
A good polished surface can be obtained. After polishing is completed, the motor 41 is rotated in the reverse direction, and the pinch roller 18 is raised.
The polishing tape 14 is separated from the magnetic disk 5.

The lower motor 42 and the braking electromagnetic clutch 48 are also controlled by a control circuit (not shown), and the motor 4 described above is controlled by a control circuit (not shown).
1 and the braking electromagnetic clutch 48, the lower abrasive tape 15 is also held by the pinch roller 20, contacts the lower surface of the magnetic disk 5 without any shock, and presses it with a predetermined pressure. Polishing is performed evenly and a well-polished surface is obtained.

Effects As described above, according to the magnetic disk ω1 polishing device of the present invention, the rllI polishing tape contacts the magnetic surface of the magnetic disk without impacting it and is pressed with a constant force, so that The amount of polishing does not become excessive, and the entire area including the polishing start area can be polished evenly and evenly, and a good polished surface can be obtained. By configuring the roller movement speed control means with an air flow rate adjustment mechanism, the pinch roller suppression means with a braking type electromagnetic clutch, and the pinch roller movement speed control means with means for controlling the rotational speed of the motor, it is possible to achieve a smaller solution. It has the following features.

[Brief explanation of drawings]

Figures 1 (A) to (C) are diagrams each showing the manufacturing process of a magnetic disk, Figure 2 is a perspective view of an embodiment of the magnetic disk polishing apparatus of the present invention, and Figure 3 is another example of the apparatus of the present invention. FIG. 4 is a sectional view showing the structure of the braking electromagnetic clutch in FIG. 3. 1... Magnetic disk, 2... Substrate, 3.4.3A. 4A...Magnetic film, 5...Coated magnetic disk, 10.40...Magnetic disk polishing device, 11...
・Clasiva, 12...Motor spindle, 13...
Motor, 14.15... Abrasive tape, 14a, 15a
...supply side abrasive tape winding body, 14. b, 15b...
- Winding side abrasive tape winding body, 16.17... pinching drive mechanism, 18.20... pinch roller, 19.21...
・Rotation support part, 22.23...Air cylinder, 22a
, 23a... Piston, 22b, 23b... Rod, 24° 29... Compressed air source, 25.30... Switching valve, 26° 31... Speed controller, 26a,
31a...variable throttle valve, 27.28, 32.33...
・Piping, 41.42...Motor, 43.44...Pinion, 45.46...Rack, 47.48...Braking electromagnetic latch, 49.50...Flange, 51.
...Electromagnetic coil, 52...Voltage control circuit, 53...
Motor control circuit. ′! s3 diagram

Claims (3)

[Claims] (1)? In a magnetic disk polishing device that polishes the magnetic surface of a magnetic disk by pressing a 1lllli tape against the magnetic surface of the magnetic disk using a pinch roller, the pinch roller approaches the magnetic disk and presses the polishing tape against the magnetic surface of the magnetic disk. What is claimed is: 1. A magnetic disk polishing apparatus characterized in that the magnetic disk polishing apparatus is configured to include a pinch roller pressing means provided with a moving speed control means capable of controlling the moving speed when making contact. (2) The magnetic field according to claim 1, wherein the pinch roller suppressing means is an air cylinder mechanism for operating the pinch roller moving mechanism, and the moving speed controlling means is an air flow rate adjustment am. Disc polishing! i device. (3) The pinch roller pressing means includes a motor and a braking type electromagnetic clutch provided on a path for transmitting the rotation of the motor to the pinch roller movement mechanism, and the movement speed control means controls the rotational speed of the motor. 2. The magnetic disk polishing apparatus according to claim 1, wherein the magnetic disk polishing apparatus is a means for controlling.