JPH03141027A - Apparatus for producing perpendicular magnetic recording medium - Google Patents

Abstract

PURPOSE:To prevent the generation of wrinkling and folding by using rolls each having an outer frame, the outer peripheral sides of which from a square column shape, matching the pitch of magnetic films and the distances between the rolls and between the outer frames and feeding the magnetic films without contact with the outer frames. CONSTITUTION:A high-polymer film 4 is intermittently delivered from the roll 1 and the magnetic films 5 are formed at the specified pitch by targets 6 be tween the rolls 2. The magnetic films are then taken up on the roll 3. Each of the rolls has the outer frame 9 which forms the same square column. The spacing between the rolls 2 and 3 is one pitch of the magnetic films 5 and the magnetic film part always enters the virtual plane 10 between the outer frames 9. The film is thus sent and taken up without contact with the outer frames 9. The parts where the magnetic films 5 are formed are, therefore, shrunk by natural cooling and the magnetic disk products are obtd. at a high yield without generating the wrinkling and folding.

Description

DETAILED DESCRIPTION OF THE INVENTION Object of the Invention [Field of Industrial Application] The present invention relates to an apparatus for manufacturing a perpendicular magnetic recording medium used for a flexible magnetic disk for perpendicular magnetic recording.

[Conventional technology]

In recent years, with the demand for higher density magnetic recording, research has been actively conducted on perpendicular magnetic recording, which is less affected by demagnetizing fields and is expected to dramatically improve recording density.

Vacuum deposition of a Co-based magnetic film on a long polymer film,
It has been found that perpendicular magnetic recording media (hereinafter referred to as perpendicular media) manufactured by sputtering or plating methods exhibit particularly excellent high-density recording characteristics in perpendicular magnetic recording systems because the magnetic layer is a continuous thin film. Development of application to various product forms such as various magnetic tapes and disk-shaped magnetic recording media is progressing. A long polymer film 4 fed out from the feed roll 11
The authors propose an apparatus for producing a perpendicular medium with good reproducibility by causing the magnetic film 5 to run intermittently through two guide rolls 12 and forming the magnetic film 5 on the circular shape of the magnetic disk at a constant pitch. In that case, the movement of the polymer film 4 is stopped only when forming the magnetic film 5, and sputtering is performed using the target 6 to form the magnetic film 5. After sputtering, the film is wound onto a winding roll 13.

By performing sputtering intermittently at a constant pitch in this manner, it becomes possible to form the magnetic film 5 intermittently on the long polymer film 4.

However, the perpendicular medium manufactured by the apparatus shown in FIG. 3 has a drawback in that the magnetic film 5 is wrinkled or folded when passing through the guide roll 12 after the magnetic film 5 has been formed. That is, as shown in FIG. 4, a plan view of a vertical medium produced using a conventional apparatus, the part of the polymer film 4 where the magnetic film 5 is formed swells due to the heat of the sputtering, and this part comes into contact with the guide roll 12. Wrinkles 14 and folds 15 were generated in the magnetic film 5 as it was cooled, contracted and passed through. Therefore, when a magnetic disk is punched from the polymer film 4, wrinkles 14 and folds 15 remain on the magnetic disk, resulting in a defective product and a problem of low yield.

[Problem to be solved by the invention]

The present invention solves the above problems and prevents wrinkles and folds from occurring in the magnetic film when the polymer film on which the magnetic film is formed is transported and rolled up, thereby improving the yield of magnetic disk products in mass production. The purpose of the present invention is to provide a vertical media manufacturing device with excellent performance.

8. Structure of the invention [Means for solving the problem] The present invention manufactures a perpendicular magnetic recording medium by intermittently forming a magnetic film for perpendicular magnetic recording on a long polymer film by a sputtering method. In the apparatus, at least the guide roll and the take-up roll have an outer frame having a prismatic outer periphery, and the pitch of the intermittently produced magnetic film is adjusted to the distance between each of the rolls and between the outer frames, This perpendicular magnetic recording medium manufacturing apparatus is characterized in that the magnetic film portion is always transported and wound up without touching the outer frame of each roll.

[Effect]

At least the shape of the guide roll and take-up roll,
By using a roll with an outer frame that creates a prismatic shape instead of the conventional cylindrical shape, and matching the pitch of the intermittently produced magnetic films, the distance between each roll, and the distance between the outer frames, the magnetic film part will always be aligned with the outer frame of the roll. It is transported and wound up without touching the outer frame of the roll.

Therefore, since the portion of the polymer film where the magnetic film is formed does not come into contact with the roll, it does not suddenly shrink but naturally shrinks due to natural cooling, so that no wrinkles or folds occur in the magnetic film.

〔Example〕

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

FIG. 1 is an external perspective view showing one embodiment of a roll used in the vertical media manufacturing apparatus of the present invention. Four support plates 8 are attached to the roll shaft 7 by arranging them in a wing shape at right angles, and the outer periphery of each support plate 8 is combined to form a square prism shape.
The outer frame 9 is a roll in which four ischaemias 10 (indicated by dotted lines) are formed. This roll has a structure in which the polymer film is conveyed along four ischaemias 10 and wound up.

FIG. 2 is a schematic perspective view of the main parts of a vertical media manufacturing apparatus showing an embodiment of the present invention in which the rolls shown in FIG. 1 are arranged. That is, a circular magnetic film 5 is formed at a constant pitch on a polymer film 4 that is intermittently sent out from a delivery roll 1 by a sputtering method using a target 6 between two guide rolls 2. This is a device for manufacturing perpendicular magnetic recording media by winding the media. The delivery roll 1, the guide roll 2, and the take-up roll 3 are each formed with an outer frame 9 having the same shape as the roll shown in FIG. 1 and forming a rectangular column shape. In this manufacturing apparatus, at least the distance between the guide roll 2 and the winding roll 3 after forming the magnetic film 5 is
The pitch is adjusted to be an integral multiple of the pitch of the magnetic film 5 on the polymer film 4.

Further, the intervals between the outer frames 9 of each of the guide rolls 2 and the winding rolls 3 are matched to one pitch of the magnetic film 5,
A portion of the magnetic film 5 always enters the ischemia 10 between the outer frames 9 of the rolls, and is configured to be transported and wound up without touching the outer frames 9. Therefore, according to this manufacturing apparatus, the magnetic M5
The formed portion naturally shrinks due to natural cooling without directly touching the guide roll 2 and take-up roll 3, so wrinkles and folds do not occur, and magnetic disk products can be obtained at a high yield.

In order to demonstrate this, a magnetic film having the following specifications was produced on the following polymer film using the perpendicular media manufacturing apparatus shown in the examples of the present invention and equipped with the following rolls.

Rolls (feeding roll 1, guide roll 2, take-up roll 3) Shape: Four support plates 8 form an outer frame 9 that forms a square prism Dimensions of ischemia 10 (Length) 110mm x (Width) 300mm
■ × Four-sided polymer film 4 types Polyimide film dimensions (width) 250 ml × (thickness) 50 μm or less Margin magnetic film 5 Material CoCr alloy film dimensions Film thickness 0.5 μm External shape Approximately φ90 Bi-Sochi 110 Tenpeng Forming method RF No defects due to wrinkles or folds occurred in the vertical media obtained by magnetron sputtering.

In the roll of this example, the outer shape is a quadrangular prism, but it may be triangular or hexagonal, and although the outer frame is formed with a support plate, it may be a rod frame or a net frame, and is not limited to this example.

Furthermore, in this example, all of the rolls, including the delivery roll 1, the guide roll 2, and the take-up roll 3, have the same shape as the rolls shown in FIG. It is sufficient to use only two of them, and the invention is not limited to this example.

C1 Effects of the Invention [Effects of the Invention] As described above, according to the present invention, the magnetic film formed on the polymer film is free from wrinkles and folds, and it is excellent in mass production, allowing magnetic disks to be obtained at a high yield. It is possible to provide an apparatus for manufacturing a perpendicular magnetic recording medium.

[Brief explanation of the drawing]

FIG. 1 is an external perspective view showing one embodiment of a roll used in the perpendicular magnetic recording medium manufacturing apparatus of the present invention. FIG. 2 is a schematic perspective view of the main parts of a perpendicular magnetic recording medium manufacturing apparatus showing an embodiment of the present invention in which the rolls shown in FIG. 1 are arranged. FIG. 3 is a schematic perspective view showing the main parts of a conventional perpendicular magnetic recording medium manufacturing apparatus. FIG. 4 is a plan view of a perpendicular magnetic recording medium manufactured by a conventional perpendicular magnetic recording medium manufacturing apparatus. 1-... Delivery roll (of the present invention), 2... Guide roll (of the present invention), 3... Winding roll (of the present invention), 4... Polymer film, 5... Magnetic Membrane, 6...
・Target, 7... Roll axis, 8... Support plate, 9
... Outer frame, 10 ... Ischemia, 11 ... (Conventional) delivery roll, 12 ... (Conventional) Guide roll, 1
3...(Conventional) winding roll, 14...Wrinkle, 1
5...Break.

Claims (1)

[Claims] 1. In an apparatus that manufactures a perpendicular magnetic recording medium by intermittently forming a magnetic film for perpendicular magnetic recording on a long polymer film by sputtering, at least the outer periphery of the guide roll and take-up roll is square. A roll having an outer frame forming a columnar shape is used, and the pitch of the magnetic film produced intermittently and the distance between each roll and the outer frame are adjusted so that the magnetic film part does not always touch the outer frame of each roll. An apparatus for manufacturing a perpendicular magnetic recording medium, which is transported and wound.