JPS59148136A - Method and device for production of flexible magnetic disk - Google Patents

Abstract

PURPOSE:To reduce the process defect factor by polishing instantaneously and concurrently both recording sides of a magnetic disk blanked out of a magnetic sheet without taking it out of a metallic mold. CONSTITUTION:A magnetic sheet C is blanked by metallic molds 12 and 12' and 13 and 13', and a magnetic disk D is obtained. The disk D is held between molds 12 and 12' and revolved together with these molds 12 and 12' by a motor 14. While a polishing tape 16 set at the lower side touches the disk D, and at the same time a polishing tape 16' of the upper side also touches the disk D. Thus both recording sides of the disk D are polished at a time.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a method and apparatus for manufacturing a flexible magnetic disk used as a recording medium of an information processing device.

(Conventional structure and its problems) Generally, flexible magnetic disks are made by applying magnetic paint to both sides of a flexible substrate such as a polyester film, drying it, punching it out into a disk shape, and polishing the coated surface uniformly. It is made by This polishing is performed to ensure high reliability by keeping the track surface, where the magnetic head slides on the disk surface during use to record and reproduce information, in an excellent surface condition with no dropouts. It is.

Conventionally, in manufacturing such flexible magnetic disks, a magnetic disk punched out by a punching device is transported from the punching device to a polishing device, and all sides of the magnetic disk are polished one by one.

Figure 1 shows a magnetic disk punched out using a conventional punching device, where A is the upper die for punching, and B is the upper die for punching.
is a lower mold. By pressing these molds from above and below, the magnetic disk D is punched out from the magnetic sheet C.

Fig. 2 shows a conventional example of a polishing device for polishing the recording surface of a magnetic disk. It is equipped with a chuck 2 for clamping the magnetic disk Di placed at its center hole, a motor 3 for rotationally driving the flat substrate 1, and a push rod 5 made of felt or the like for pressing the polishing tape 4 against the magnetic disk D.
The magnetic disk D held by the chuck 2 is transferred to the motor 3.
Polishing is performed by rotating the magnetic disk D and pressing the polishing tape 4 against the surface of the magnetic disk D with a push rod 5.

The abrasive tape 4 is made of a film made of polyester or the like coated with a binder mixture and abrasive fine powder such as molten alumina, silicon carbide, chromium oxide, corundum, or iron oxide.
It has a polishing layer of 20 μm. However, such conventional equipment can only polish one side at a time, as mentioned above.
Dust and irregularities on the substrate 1 directly affect the polished surface of the magnetic disk D, causing dropouts, and it is also time consuming.

In addition, when considering the entire process, it takes time to transport the disk from the punching device to the polishing device, and the process of turning over the magnetic disk for double-sided polishing, which increases the number of steps and increases the risk of process defects due to surface scratches. resulting in an increase in

(Objective of the Invention) The present invention eliminates such conventional drawbacks, and by integrating a punching device and a polishing device and polishing both sides simultaneously, it shortens the time and eliminates the influence of dust, etc. Furthermore, it is an object of the present invention to provide a method and apparatus for manufacturing a flexible magnetic disk, which makes it possible to reduce the process defect rate by reducing the number of steps.

(Structure of the Invention) A method for manufacturing a flexible magnetic disk according to the present invention includes:
The present invention is characterized in that a magnetic disk is punched out from a magnetic sheet using a punching die, and both recording surfaces of the magnetic disk are simultaneously polished simultaneously while the punched magnetic disk is held between the punching die without being removed. The device that implements this consists of two bases (upper and lower) that can slide on each other, an inner part of a container that has a space inside to keep the magnetic disk in a compressed state after punching the magnetic disk, and a magnetic base. a mold for punching a magnetic disk, the upper and lower sides of which are rotatably supported by the two bases, respectively, for releasing the magnetic sheet after punching the disk; and the polishing part supported by the bases. The present invention is characterized by comprising two polishing devices (5), upper and lower, which extend from the space of the mold to the surface of the magnetic disk, and a rotational drive device that rotationally drives the mold after punching out the magnetic disk. .

(Explanation of Examples) Hereinafter, one embodiment of the present invention will be described based on the drawings.

FIG. 3 is a schematic cross-sectional view showing an embodiment of a flexible magnetic disk manufacturing apparatus according to the present invention, FIG. 4 is a cross-sectional view showing the state of the mold after punching out the magnetic disk, and FIG. 5 is a perspective view of the mold part. are shown respectively. 10 in the figure
11 is a fixed base, 11 is a movable base that can be slid up and down by hydraulic pressure, etc., and 12, 12' and 13° and 13' punch out a magnetic disk D from a magnetic sheet C, respectively. The lower sides (12, 13) of these molds are attached to the fixed base 10,
The twisted upper sides (12', 13') are rotatably supported by the movable base 11, respectively. 14 and ], 5
, ], 5' is each of the molds 12, 12', 13°1
A motor and a rotation transmission gear 16, 1.6' extend from the space 12a, ]2a' formed inside the mold and cover both sides of the magnetic disk D. This polishing tape l 6 , ] 6 is movable so that a new abrasive surface always comes into sliding contact with the magnetic disk surface. 17, 17' are polishing teeth] 6, 16' are push rods that press against the magnetic disk D. Materials such as felt or polymer foam may be used, or magnetic materials may be used with a spring inserted to absorb excessive pressure. This enables simultaneous polishing of both sides of the disc to ensure a smooth surface.

] 8 , ] 8 ′ is a polishing tape 6 , 16 ′ and a noise provided near the sliding contact portion of the magnetic disk D to absorb polishing debris.

Next, the operation of the flexible magnetic disk manufacturing apparatus configured as described above will be explained. When the magnetic sheet C is set at a predetermined position in the mold by means not shown, the movable base 11 slides downward, and the molds 12 (12'),
13 (13') punches out the magnetic disk D, the inner molds 1.2 and 12' continue to hold the magnetic disk D as they are, and the outer molds (7) J-3 and 13' have their upper and lower sides pressed against each other. Separate and release the magnetic sheet C. The inner molds 12 and 12' are rotationally driven by a motor J4 while holding the magnetic disk D under pressure. On the other hand, the lower abrasive tape 16 has been in contact with the surface of the magnetic disk since the magnetic sheet C was set, and the upper abrasive tape 16' is in contact with the magnetic disk surface when punching the magnetic disk.
Since the upper molds 12' and 13/ are lowered by the movable base 11 and come into contact with the surface of the magnetic disk, both sides of the recording surface of the magnetic disk D are polished simultaneously. The polishing debris generated at this time is sucked by the rl-8, 18' as described above.

In the above embodiment, by creating an air flow in the center of the inner mold as shown in FIG. 4, punching debris in the disk center hole can be immediately removed.

(Effects of the Invention) As explained above, according to the present invention, there is no need for the conventional process of transporting the punching device from the punching device to the polishing device, and moreover, both sides are polished at the same time, which greatly reduces the time required (8). Furthermore, dropouts caused by these steps can be completely prevented by significantly reducing the number of steps. In addition, in the case of the present invention, the surface to be polished does not come into contact with the substrate, etc., so there is no influence of surface irregularities caused by dust, etc., and a uniform polished surface can be obtained.Furthermore, the required space can be reduced to less than half that of conventional methods. It has many advantages such as:

[Brief explanation of drawings]

Fig. 1 is a diagram showing a state in which a conventional punching device has punched out a magnetic 7'' sheet, Fig. 2 is a schematic diagram showing a conventional example of a polishing device, and Fig. 3 is a flexible magnetic disk manufacturing apparatus according to the present invention. FIG. 4 is a diagram showing a state in which a disk is punched out by the disk punching die of the present invention, and FIG. 5 is a perspective view showing the die portion for disk punching of the present invention. 10...Fixed base, 11...Movable base, 12.12
'...Inner mold, 13.13'...Outer mold, 14
...Motor,] ]5, 15'...Rotation transmission gear,
16, ] 6'... Polishing (9) Polishing tape, 17, 17'... Push rod, ]-8, 18'
... Pipe for suction of polishing debris. (10) Figure 3 Figure 5

Claims (2)

[Claims] (1) A magnetic disk is punched out using a punching die from a magnetic sheet formed by forming magnetic layers on both sides of a flexible substrate such as a polyester film, and the punched magnetic disk is sandwiched between the punching die without being removed. A method for manufacturing a flexible magnetic disk, characterized by simultaneously polishing both recording surfaces of the magnetic disk in a compressed and rolled state. (2) In a flexible magnetic disk manufacturing method in which a magnetic disk is punched out of a magnetic sheet made by forming magnetic layers on both sides of a flexible substrate such as a polyester film, and the recording surface is polished to produce a flexible magnetic disk, It consists of two slidable upper and lower bases, an inner part having a space inside and for keeping the magnetic disk in a compressed state after punching the magnetic disk, and an outer part for releasing the magnetic sheet after punching the magnetic disk. A mold for punching a magnetic disk, the upper and lower sides of which are rotatably supported by the two bases, and a polishing part supported by the bases and extending from the space of the mold to the surface of the magnetic disk. 1. An apparatus for manufacturing a flexible magnetic disk, comprising: two polishing devices (upper and lower) for punching the magnetic disk, and a rotary drive device for rotationally driving a mold after punching the magnetic disk.