JPS60147932A - Magnetic recording medium manufacturing device - Google Patents

Abstract

PURPOSE:To manufacture a magnetic recording medium with good surface property by providing a cooling roller to the exit of a high polymer film wound on a can. CONSTITUTION:When the high polymer film 13 wound on the can 14 passes through an upper part of a vapor-deposition source 15 installed oppositely to the can 14 at a prescribed speed, a magnetic metallic particle emitted from the vapor deposition source 15 is adhered on the high polymer film 13 so as to form continuously a metallic thin film on the high polymer film 13 supplied continuously from a winding roll 11. The high polymer film 13 adhered with the metallic thin film reaches a high temperature by the radiation heat from the vapor deposition source 15 in this case, the film is cooled while being in contact with the cooling roller 17 and wound on the winding roll 16 and then, no heat is stored in the winding roll 16 and a job for a long time is conducted while the winding roll is kept always to a low temperature.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a magnetic recording medium manufacturing apparatus used for manufacturing magnetic metal thin films made of ferromagnetic metals such as Fe, Co, Ni, etc. or alloys thereof. be.

Structure of conventional example and its problems In recent years, with the increase in recording density of magnetic recording devices, the conventional coating type recording medium in which acicular crystals of γ-Fe2O3 are coated on a base film together with a binder has been changed. Research and development of metal thin film magnetic recording media is underway. These magnetic recording media are made using a vacuum evaporation method on top of a non-magnetic base film.

A magnetic metal is formed by a method such as a sputtering method or an ion blasting method, and since it is thinner than a coating type recording medium, it is advantageous in terms of high recording density. In addition, in contrast to the conventional longitudinal recording method, vacuum evaporation and sputtering methods are also available.

A perpendicular magnetic recording method has been proposed that is suitable for recording media in which a metal magnetic layer with perpendicular magnetic anisotropy is formed using a method such as the ion blating method. It becomes possible to achieve a recording density about 10 times higher.

Various manufacturing apparatuses for manufacturing magnetic recording media of each of these types have been proposed. A conventional manufacturing apparatus for a metal thin film magnetic recording medium will be described below with reference to the drawings.

FIG. 1 is a front view showing the internal structure of a vacuum chamber of a conventional magnetic recording medium manufacturing apparatus. In the figure, 1 is an unwinding roll, 2 is a guide roller, 3 is a polymer film sent out from the unwinding roll, 4 is a cylindrical can around which the polymer film 3 is wound, and 6 is a cylinder facing the cylindrical can 4. A magnetic metal evaporation source 6 is installed at the center, and 6 is a take-up roll for winding up the polymer film with the magnetic metal thin film attached thereto.

In the magnetic recording medium manufacturing apparatus as described above, when the can 4 rotates at a constant speed and the polymer film 3 wound around the can 4 passes over the evaporation source 6 at a constant speed, the evaporation source By adhering the metal particles ejected from the polymer film 3 onto the polymer film 3, a metal film can be continuously formed on the polymer film 3. At this time, the can 4 is kept at a constant temperature by a heating medium, and the polymer film 3 is brought into close contact with the can 4 to prevent the polymer film 3 from being damaged by the radiant heat from the evaporation source 6.

However, in the magnetic recording medium manufacturing apparatus as described above, the radiant heat from the evaporation source 5 is accumulated in the polymer film 3 on which the metal thin film is formed and is wound around the take-up roll 6. In addition, the radiant heat from the evaporation source 6 is transmitted through the formed metal thin film and reaches the take-up roll 6 at a groove, so the take-up roll 6 remains at a fairly high temperature. cormorant. For this reason, oligomers are gradually generated over a long period of time from the back side of the surface on which the metal thin film is formed of the polymer film 3 wound on the take-up roll 6, and oligomers are gradually generated from the back side of the polymer film 3 wound on the take-up roll 6. This oligomer is transferred to the surface of the thin metal film of the magnetic recording medium, resulting in a decrease in the surface properties of the magnetic recording medium, which greatly reduces the spacing between the magnetic head and the magnetic recording medium during recording and reproduction, resulting in a decrease in the reproduction signal output, and a decrease in the recording This had the disadvantage of causing deterioration of density characteristics.

Purpose of the Invention The present invention has been made to solve the above-mentioned conventional problems.
An object of the present invention is to provide a magnetic recording medium manufacturing apparatus capable of producing a thin metal film magnetic recording medium free of oligomers and having good surface properties.

Structure of the Invention The basic structure of the present invention includes an unwinding roll, a cylindrical can, and a magnetic metal evaporation source facing the can, and a cooling roller is installed between the can and the take-up roll to prevent the polymer film from being heated. By cooling, the generation of oligomers is prevented, and magnetic recording media with good surface properties can be manufactured.

Description of examples An embodiment of the present invention will be described below with reference to the drawings.

FIG. 2 is a front view of the inside of a vacuum chamber of a magnetic recording medium manufacturing apparatus in one embodiment of the present invention. In the figure, 11 is an unwinding roll, 12 is a guide roller, 13 is a polymer film sent out from the unwinding roll, 14 is a cylindrical can around which the polymer film 13 is wound, and 16 is a cylindrical can facing the cylindrical can 14. A magnetic metal evaporation source is installed, 16 is a take-up roll for winding up the polymer film to which the magnetic metal is attached, and 17 is a cooling roller installed between the can 14 and the take-up roll.

The operation of the magnetic recording medium manufacturing apparatus configured as above will be described below. When the polymer film 13 wrapped around the can 14 passes at a constant speed over the evaporation source 15 installed opposite the can 14,
When the magnetic metal particles ejected from the evaporation source 15 adhere to the polymer film 13, the unwinding roll 1
A metal thin film is continuously formed on a polymer film 13 that is continuously fed out from 1. At this time, the polymer film 13 to which the metal thin film is attached is at a high temperature due to the radiant heat from the evaporation source 16, but after being cooled by contacting the cooling roller 17, it is wound up by the winding roll 16.
Heat is not accumulated in the take-up roll 16, and heat is not accumulated in the evaporation source 16 through the metal film formed on the polymer film 13.
Since the radiant heat from the polymer film is blocked by the cooling roller 17, the take-up roll 16 is always kept at a low temperature, and even if the metal film is continuously formed for a long time, almost no oligomer comes out from the polymer film. 1000 to 100 for those manufactured according to the conventional example.

The number of oligomers produced in this example can be reduced to about 10 to 100 oligomers.

Effects of the Invention As described above, since the present invention is equipped with a cooling roller between the cylindrical can and the take-up roll, the radiant heat of the evaporation source accumulated during the formation of the metal film on the polymer film is transferred to the cooling roller. In addition, the cooling roller blocks the radiant heat from the evaporation source transmitted through the metal thin film formed on the polymer film, so the take-up roll is always kept at a low temperature to prevent oligomers from precipitating from the polymer film. Excellent magnetic recording media with very good surface properties can be manufactured.

[Brief explanation of drawings]

FIG. 1 is a front view showing the inside of a vacuum chamber of a conventional magnetic recording medium manufacturing apparatus, and FIG. 2 is a front view showing the inside of a vacuum chamber of a magnetic recording medium manufacturing apparatus according to an embodiment of the present invention. 11... Unwinding roll, 12... Guide roller, 13... Polymer film, 14
... Cylindrical can, 16 ... Magnetic metal evaporation source, 16 ... Winding roll, 17 ...
...cooling roller. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
II! J No. 25!1

Claims (1)

[Claims] It has at least a cylindrical can around which a polymer film is wound in a vacuum chamber, and a magnetic metal evaporation source provided opposite to the can, and a cooling roller is provided on the exit side of the polymer film wound around the can. A magnetic recording medium manufacturing apparatus characterized by: