JPS59139129A - Magnetic tape - Google Patents

Abstract

PURPOSE:To provide a metallic thin film type magnetic tape using iron as a magnetic recording medium unexpensively by laminating a corrosion resisting metallic layer, a ferrous metallic magnetic layer and the 2nd corrosion resisting metallic layer successively on a base film. CONSTITUTION:The corrosion resisting metal such as nickel is plated by evaporation on the base film 1 such as polyester to form the corrosion resisting metallic layer 2 and iron plating resist is applied to the surface of the layer 2 to form a resist layer 5. An ultraviolet-ray masking part M1 having about 3.81mm. equal interval width in the longitudinal direction and an ultraviolet-ray mask M having an exposing part M2 of about 0.05mm. width are continuously masked on the layer 5 and then exposed to ultraviolet rays and an unmasked part 5a is hardened. Subsequently, an unhardened part 5b is removed and then iron is evaporated in vacuum to form a thin film magnetic layer 3. The hardened part 5a is separated with a solvent to obtain a tape on which the iron magnetic layer 3 part of about 3.81mm. width and a non-iron metal plating part 2 of about 0.05mm. width are alternately arranged. Subsequently, a corrosion resisting metal such as cobalt is plated by evaporation to form the 2nd corrosion resisting metallic layer 4 as an oxidation protecting layer.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a magnetic tape using an iron-based metal having high electromagnetic properties as a magnetic recording medium.

Structure of the conventional example and its problems A conventional metal thin film magnetic tape using metal as a magnetic recording medium has a cobalt metal layer B as a magnetic metal provided on a base film A, as shown in FIG. Magnetic tape not only has excellent wavenumber characteristics, but also high sensitivity and
High MOL (Maximum Output Level
; the maximum output level of the magnetic tape) is preferably 2\-no. To this end, it is necessary to use a magnetic recording medium that has an appropriate coercive force and a high saturation magnetic flux density, but the cobalt-based metal described above has not been a medium that satisfactorily satisfies the above conditions. Iron is superior to cobalt as a magnetic recording medium, so thin film tapes made of iron have lower sensitivity and M
Although it is preferable from the viewpoint of OL, iron is not put to practical use because it is easily oxidized.

OBJECTS OF THE INVENTION It is an object of the present invention to provide, at low cost, a thin metal film type magnetic tape using iron, which has such excellent properties, as a magnetic recording medium.

Structure of the Invention The present invention includes a first corrosion-resistant metal layer provided on the base film, a ferrous metal magnetic layer provided on the first corrosion-resistant metal layer, This magnetic tape is composed of a second corrosion-resistant metal layer provided on the iron-based metal magnetic layer, and it is possible to provide an inexpensive magnetic tape with improved magnetic properties.

DESCRIPTION OF EMBODIMENTS FIG. 2 shows the structure of a magnetic tape according to an embodiment of the present invention. This embodiment tape includes a base film 1 made of polyester or the like, and a rust-resistant saturation magnetic flux plated on this film 1. a dense corrosion-resistant metal layer 2;
a magnetic layer 3 made of iron formed as a thin film on top of the magnetic layer 3;
A corrosion-resistant metal layer 4 having similar properties to the plated layer 2 is plated on top of the plated layer 2.

Regarding the production of magnetic tape with such a configuration, Figures 3 to 1
This will be explained using diagram o.

First, as shown in FIG. 3, a corrosion-resistant metal layer 2 is formed by depositing a corrosion-resistant metal such as nickel, cobalt, or gold on a base film 1 made of polyester or the like. Next, as shown in FIG. 4, a resist layer 6 is formed by coating iron mesochelocyst on the corrosion-resistant metal layer 2. Further, as shown in FIG. 6, ultraviolet mask portions M having uniformly spaced widths of about 3.81ffj+ in the longitudinal direction and ultraviolet mask M having exposed portions M2 of about 0.051g width are continuously formed on the resist layer δ. After aligning the mask with the resist layer 6, it is exposed to ultraviolet light and
The unmasked portion 6a of the mask is cured. Next, the 6th
After removing the uncured portion 5b of the resist layer 6 as shown in the figure, iron is vacuum deposited to form the thin film magnetic layer 3 as shown in FIG.

Next, as shown in FIG. 8, the hardened portion 6a of the resist layer 5 is peeled off using a bath agent, and the ferromagnetic layer 3 portion with a width of about 3.61 mm and the non-ferrous metal mesh portion 2 with a width of about 0.05 txm are separated. Obtain a tape with alternating . Next, as shown in FIG. 9, a corrosion-resistant metal such as cobalt, nickel, or gold is vapor-deposited on the top surface to form a second corrosion-resistant metal layer 4, thereby forming an oxidation protective layer for the ferromagnetic layer 3. After that, the magnetic tape is cut into a width of 3.81ffW to obtain a magnetic tape as shown in FIG.

Although iron was used as the magnetic material in the above embodiments, the same applies to iron alloys such as iron-nickel alloys.

Effects of the Invention Since the magnetic tape of the present invention is made of iron-based metal such as iron or iron alloy as a magnetic material, a high saturation magnetic flux density can be obtained, and sensitivity and MOL can be improved. Moreover, since the iron-based metal magnetic layer is protected by a metal layer that is difficult to oxidize, it is stable over time.

[Brief explanation of drawings]

FIG. 1 is a sectional view of a conventional magnetic tape, FIG. 2 is a sectional view of a magnetic tape according to an embodiment of the present invention, and FIGS.
The figure is a diagram for explaining the manufacturing process of the tape. DESCRIPTION OF SYMBOLS 1...Base film, 2...-First corrosion-resistant metal layer, 3...Ferromagnetic layer, 4...
...Second corrosion-resistant metal layer.

Claims (1)

[Claims] a first corrosion-resistant metal layer provided on the base film; a ferrous metal magnetic layer provided on the first corrosion-resistant metal layer; and a ferrous metal magnetic layer provided on the first corrosion-resistant metal layer. A magnetic tape comprising a second corrosion-resistant metal layer disposed on the magnetic tape.