JPH07254138A - Magnetic recording medium for transfer and transfer method - Google Patents

Abstract

PURPOSE:To make mass production of software at a low cost by making the inclination of the magnetic film columns of a second magnetic recording medium transferred with the information signal recorded on a first magnetic recording medium smaller than the inclination of the columns of the first magnetic recording medium. CONSTITUTION:The image forming signal of the inclination theta1 of the columns are recorded by ordinary means on a mother tap 11. These image forming signals are transferred by magnetic transfer to a blank tape 13 having the inclination theta2 of the columns of a magnetic metallic film. The transfer is executed by superposing both tapes in such a manner that the growth direction 12M of the columns in the magnetic metallic film 12 of the mother tape 11 and the growth direction 14B of the columns in the magnetic metallic film 14 of the blank tape 13 intersect with each other and that the magnetic metallic films 12, 14 come into contact with each other. Both tapes 11, 13 are mounted at a magnetic transfer device and a bias magnetic field is impressed on these tapes from the blank tape 13 side by a ring type magnetic head, by which the transfer is executed As a result, the copying at a high speed is repetitively and exactly executable as the copying is transfer.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a transfer technique used for recording an information signal of a mother tape on a blank tape.

[0002]

BACKGROUND OF THE INVENTION Conventionally, an information signal of a first magnetic recording medium (also called a mother tape or a master tape) is recorded at a high speed on a second magnetic recording medium (also called a blank tape or a slave tape). A magnetic transfer technique has been proposed as a means for achieving this. For example, Japanese Patent Laid-Open No. 4-16
As disclosed in Japanese Patent No. 3722, an external bias magnetic field is applied to a mother tape of a metal vapor deposition thin film type mother tape and a metal vapor deposition thin film type blank tape in such a manner that their columns are tilted in opposite directions. In the magnetic transfer method of transferring the recording magnetization of No. 1 to the blank tape, the external bias magnetic field is 110 ° ± from the in-plane direction of the mother tape for which the easy axis of magnetization is selected to be 20 ° ± 15 ° from the in-plane direction. A magnetic transfer method has been proposed which is characterized by applying in the direction of 15 °.

According to such a magnetic transfer system, the magnetic transfer efficiency is improved, demagnetization is small, and
It is said that the mother tape does not require a large coercive force and a good transfer output can be obtained.

[0004]

DISCLOSURE OF THE INVENTION The proposed technique is proposed by considering the relationship between the easy axis of magnetization of the mother tape and the direction of the external bias magnetic field, and it has its own characteristics. However, there is no consideration for the tilt of the column of magnetic particles in the metal evaporated thin film type mother tape and the metal evaporated thin film type blank tape,
It was unknown to anyone that the magnetic transfer efficiency was significantly affected by the relationship between the tilts of both columns.

That is, in the past, the inclination of the column of magnetic particles in the metal thin film type mother tape was θ ₁
Although it was not suggested that the relationship between the magnetic particle column inclination θ ₂ in the metal thin film type blank tape and magnetic column transfer efficiency had a great influence on the magnetic transfer efficiency, the research conducted by the present inventors was earnestly carried out. As a result, it has been found that by using a mother tape and a blank tape that satisfy the relationship of θ ₁ > θ _2, demagnetization of the mother tape is small and good transfer output can be obtained.

The present invention has been achieved on the basis of such knowledge, and the present invention provides a technique for copying an information signal in which demagnetization of a mother tape is small and good output can be obtained. To aim. This object of the present invention is
Is a second magnetic recording medium to which an information signal recorded on the magnetic recording medium is transferred, and the first magnetic recording medium is of a metal thin film type in which columns in the magnetic film are obliquely grown. The second magnetic recording medium is of a metal thin film type in which the column in the magnetic film grows obliquely, and the inclination θ ₂ of the column in the magnetic film of the second magnetic recording medium is the _{second one} . The magnetic recording medium for transfer according to claim ₁ , wherein the magnetic film of the magnetic recording medium is smaller than the column inclination θ ₁ .

A method of transferring the information signal recorded on the first magnetic recording medium to the second magnetic recording medium, wherein the columns of the magnetic film of the first magnetic recording medium are slanted. The second magnetic recording medium is of a grown metal thin film type, and the second magnetic recording medium is of a metal thin film type in which the columns of the magnetic film are grown obliquely, and the magnetic film of the second magnetic recording medium is The column inclination θ ₂ is the column inclination θ ₁ in the magnetic film of the first magnetic recording medium.
The magnetic films of the first magnetic recording medium and the magnetic films of the first magnetic recording medium cross each other so that the column growing direction of the magnetic film of the first magnetic recording medium intersects the column growing direction of the magnetic film of the second magnetic recording medium. It is achieved by a transfer method which is characterized in that they are superposed so as to be positioned inside and a bias magnetic field is applied from the side of the second magnetic recording medium.

In the above invention, θ ₁ is 20 to 8
It is preferably 0 ° and θ ₂ is 5 to 60 °.
That is, not only is θ ₁ > θ ₂ but θ ₁ is 20 to
By satisfying the condition of 80 ° and θ ₂ of 5 to 60 °, demagnetization was further reduced, and good output was obtained. By satisfying the condition of θ ₁ −θ ₂ of 15 to 75 °, demagnetization was further reduced and good output was obtained.

Further, it is preferable that the bias magnetic field applied when the information signal recorded on the first magnetic recording medium is transferred to the second magnetic recording medium is a ring type magnetic head. Hereinafter, the present invention will be described in more detail. The support used in the magnetic recording medium (first magnetic recording medium and second magnetic recording medium) of the present invention is non-magnetic,
Such supports include polyesters such as PET, polyamides, polyimides, polysulfones, polycarbonates,
An olefin resin such as polypropylene, a cellulose resin, an organic material such as a vinyl chloride resin, a ceramic such as glass, or a metal material such as an aluminum alloy is used. An undercoat layer for improving the adhesion of the magnetic layer (magnetic thin film) is provided on the surface of the support. That is, by appropriately roughening the surface roughness, for example, the adhesion of the magnetic thin film formed by the oblique deposition method is improved, and the surface roughness of the metal magnetic thin film surface is moderated to improve the running property. Therefore, for example, the thickness containing particles such as SiO ₂ is 0.05 to 0.5.
The undercoat layer is formed by providing a coating film having a thickness of μm.

A magnetic thin film is provided on one surface of such a support by, for example, oblique vapor deposition means. Examples of the material of the magnetic particles forming the metal magnetic thin film include Fe and C
In addition to metals such as o and Ni, Co-Ni alloys, Co-Pt
Alloy, Co-Ni-Pt alloy, Fe-Co alloy, Fe-
A Ni alloy, an Fe-Co-Ni alloy, an Fe-Co-B alloy, a Co-Ni-Fe-B alloy, a Co-Cr alloy, or those containing a metal such as Al is used. Also, Fe-N alloy, Fe-N-O alloy, Fe-C
Alloys, Fe-C-O alloys, etc. are also used. Incidentally, it is preferable that an oxidizing gas is supplied when the metal magnetic thin film is formed, and a protective layer made of an oxide film is formed on the surface layer of the metal magnetic thin film. Further, it is more preferable that diamond-like carbon, boron carbide, silicon nitride, or the like is further provided as the protective layer. Further, it is preferable to provide a fluorine-based or carbon-based lubricant on the upper layer of the protective layer.

As an apparatus for forming a metal magnetic thin film by oblique vapor deposition means, an apparatus as shown in FIG. 1 can be adopted. In FIG. 1, 1a is a supply side roll of the non-magnetic support 2 and 1b is a winding side roll of the non-magnetic support 2.
Reference numeral 3 is a cooling can roll, 4 is a guide roller provided in the traveling path of the support 2 between the supply side roll 1a and the cooling can roll 3, 5 is a crucible, 6 is an electron gun, and 7 is a magnetic metal. Further, as can be seen from FIG. 1, the guide roller 4 is configured so that its position can be changed. By adjusting the set position of the guide roller 4 variably, the inclination of the column of magnetic particles deposited by oblique vapor deposition is tilted. θ can be adjusted.

Then, in FIG. 1, the inclination θ _A of the column of the magnetic particles deposited by oblique vapor deposition with the guide roller 4 set at the position A is determined by setting the guide roller 4 at the position B (to the left of the position A, that is, The inclination of the column of magnetic particles deposited by oblique evaporation by setting the angle at which the standing angle of the support 2 from the guide roller 4 to the cooling can roll 3 is large with respect to the particles flying from the crucible 5 on the lower side. It becomes larger than θ _B.

That is, in the apparatus as shown in FIG. 1, the mother tape (first magnetic recording medium) and the blank tape (second magnetic recording medium) are made to correspond to respective positions, that is, the guide roller 4 is When the mother tape is produced at the position A, the guide roller 4 is placed at the position B to produce the blank tape. It is a thin film type and satisfies the condition that the tilt θ ₂ of the column in the metal magnetic film of the blank tape is smaller than the tilt θ ₁ of the column in the metal magnetic film of the mother tape (FIG. 2, FIG. (See FIG. 3).

The tilt of the column in the metal magnetic film is θ.
_An information signal is recorded on the mother tape _{No. 1} by a usual method. Then, the recording information signal of the mother tape is copied by magnetic transfer onto a blank tape having a column inclination of θ ₂ in the metal magnetic film. This copy is
This is performed as shown in FIGS. 4 and 5.

First, as shown in FIG. 4, the mother tape 11
As the metal growth direction 14 of the column in the metal magnetic film 14 of the magnetic film growth direction 12 of the column at 12 _M and the blank tape 13 _B intersect, and the metal magnetic film 12
And the metal magnetic film 14 are brought into contact with each other. Then, the mother tape 11 and the blank tape 13 are attached to the magnetic transfer device of FIG. 5 so that the relationship shown in FIG. 4 is satisfied. Then, a bias magnetic field is applied from the support side of the blank tape 13 by the ring type magnetic head 15,
The recording information signal of the mother tape 11 is transferred to the blank tape 13
Transfer to. In FIG. 5, 11a is a supply reel of the mother tape 11, 11b is a take-up reel of the mother tape 11, 13a is a supply reel of the blank tape 13,
Reference numeral b is a reel on the winding side of the blank tape 13, 16 and 17 are guide rollers, and 18 is a transfer drum made of a soft magnetic material.

When the information signal is copied as described above, since it is a transfer, it can be copied at a high speed.
Then, in the blank tape, the bias magnetic field is applied in the easy magnetization direction, so that the information signal is efficiently copied. In the mother tape, the bias magnetic field is applied in the difficult magnetization axis direction, and thus demagnetization is hard to occur. The information signal can be copied repeatedly and accurately.

The present invention will be described below with reference to specific examples.

[0018]

【Example】

[Embodiment 1] FIGS. 1 to 5 are for explaining one embodiment of the present invention. FIG. 1 shows a first magnetic recording medium (mother tape) and a second magnetic recording medium (blank tape). )
2 is a schematic sectional view of a mother tape, FIG. 3 is a schematic sectional view of a blank tape, and FIG. 4 is a schematic side view showing a relationship between the mother tape and the blank tape during transfer. 5 and 5 are schematic views of the transfer device.

First, as shown in FIG. 1, a non-magnetic support (PET film) 2 is bridged between a supply-side roll 1a and a winding-side roll 1b, and then run along a cooling can roll 3. Then, the guide roller 4 is set to the position A, the inside of the vacuum container is evacuated to a vacuum degree of about 10 ⁻⁴ to 10 ⁻⁶ Torr, and then the magnetism inside the crucible 5 is increased by electron beam heating from the electron gun 6. A metal thin film type mother tape 11 was obtained by melting and evaporating the metal (Co) 7 and vapor-depositing Co particles to a thickness of 0.3 μm on the PET film 2 attached to the cooling can roll 3.

The mother tape 11 thus obtained has a column structure as shown in FIG. 2, and the column inclination θ ₁ is 60 ° and Hc is 1680O.
e and Bs were 6200 G, Br / Bs was 0.81, and the center line average roughness Ra of the surface of the metal magnetic film 12 was 1.2 nm. Then, this tape was cut into a width of 8 mm, and an information signal was recorded using a mirror mother manufacturing machine in a pattern opposite to the usual high band 8 mm VTR track pattern.

The same operation is performed (however, the guide roller 4 is set to the position B, and the magnetic metal is Co-Ni (80-20)).
Alloy), and PET film 2 were vapor-deposited with Co—Ni particles to a thickness of 0.2 μm to obtain a metal thin film type blank tape 13. The blank tape 13 thus obtained has a column structure as shown in FIG. 3, and the column inclination θ ₂ is 25 ° and H
c was 1040 Oe, Bs was 4100 G, Br / Bs was 0.78, and the center line average roughness Ra of the surface of the metal magnetic film 14 was 2.4 nm.

Then, as shown in FIG. 4, the column growth direction 12 in the metal magnetic film 12 of the mother tape 11 is increased.
_M is overlapped with the growth direction 14 _B of the column in the metal magnetic film 14 of the blank tape 13 and the metal magnetic film 12 and the metal magnetic film 14 are in contact with each other, and the relationship is satisfied. The mother tape 11 and the blank tape 13 are mounted on the magnetic transfer device 5 and a bias magnetic field is applied from the support side of the blank tape 13 by the ring type magnetic head 15 to transfer the recording information signal of the mother tape 11 to the blank tape 13. did.

[Embodiment 2] In Embodiment 1, the column inclination θ ₁ = 80 °, Hc = 1490 Oe, Bs = 730.
A magnetic metal (Fe—Co (80:20) alloy) was deposited so as to have 0 G, Br / Bs = 0.73, and Ra = 1.1 nm to prepare a mother tape 11. Then, an information signal was recorded on the mother tape 11 in the same manner as in Example 1 and transferred to the blank tape 13 in Example 1.

[Embodiment 3] In Embodiment 2, the column inclination θ ₂ = 60 °, Hc = 920 Oe, Bs = 4800.
A blank tape 13 was prepared by depositing a magnetic metal (Co—Ni (80:20) alloy) so that G, Br / Bs = 0.69, and Ra = 1.3 nm. And Example 2
The recording information signal of the mother tape 11 was transferred to the blank tape 13 of this embodiment.

[Embodiment 4] In Embodiment 1, the column inclination θ ₁ = 20 °, Hc = 1830 Oe, Bs = 710.
A magnetic metal (Co) was deposited to 0 G, Br / Bs = 0.91, and Ra = 1.8 nm to prepare a mother tape 11, and the column inclination θ ₂ = 5 °, Hc = 1180.
Oe, Bs = 4900G, Br / Bs = 0.87, Ra
Magnetic metal (Co-Ni (80:
20) Alloy) was deposited to produce a blank tape 13.

Then, using these tapes, Example 1
Similarly to the above, the recording information signal of the mother tape 11 was transferred to the blank tape 13. [Fifth Embodiment] In the first embodiment, the column inclination θ ₁ = 4.
0 °, Hc = 1710 Oe, Bs = 7700G, Br /
A magnetic metal (Co) is deposited so that Bs = 0.84 and Ra = 1.6 nm to produce the mother tape 11, and
Column inclination θ ₂ = 20 °, Hc = 1060 Oe, Bs
= 4200G, Br / Bs = 0.78, Ra = 2.3n
A magnetic metal (Co-Ni (80:20) alloy) was deposited so that the blank tape 13 had a thickness of m.

Then, using these tapes, Example 1
Similarly to the above, the recording information signal of the mother tape 11 was transferred to the blank tape 13. [Comparative Example 1] The same mother tape 11 as in Example 1 was used.
And a blank tape 13 were prepared, and as shown in FIG. 4, the column growth direction 12 _M in the metal magnetic film 12 of the mother tape 11 and the metal magnetic film 1 of the blank tape 13 were prepared.
So that the column growth direction 14 _B in 4 intersects,
Further, the metal magnetic film 12 and the metal magnetic film 14 are superposed so as to be in contact with each other, and this is mounted on the magnetic transfer device in which the ring type magnetic head 15 in the magnetic transfer device of FIG. A bias magnetic field was applied from the support side of the mother tape 11 to transfer the recording information signal of the mother tape 11 to the blank tape 13.

Comparative Example 2 In Example 1, the column inclination θ ₁ = 45 °, Hc = 1720 Oe, Bs = 750.
The magnetic tape (Co) was deposited to 0 G, Br / Bs = 0.83, and Ra = 1.7 nm to prepare the mother tape 11, and the column inclination θ ₂ = 60 °, Hc = 810.
Oe, Bs = 4400G, Br / Bs = 0.58, Ra
A magnetic metal (Co—Ni) was deposited so that the blank tape 13 was 2.1 nm.

Then, using these tapes, Example 1
Similarly to the above, the recording information signal of the mother tape 11 was transferred to the blank tape 13. [Characteristics] Using a commercially available measuring machine modified from a high-band 8 mm VTR, the transfer from the mother tape 11 to the blank tape 13 in each of the above examples was repeated 5000 times, and the output of the mother tape 11 decreased and blank The reproduction output of the tape 13 was measured, and the results are shown in Table 1 below.

Table-1 Output reduction of mother tape 11 Reproduction output of blank tape 13 (dB) 1 MHz (dB) 7 MHz (dB) Example 1 2.0 -1.8 -1.2 Example 2 2.4- 1.9-1.3 Example 3 2.3-2.1-0.8 Example 4 1.5-1.2-2.2 Example 5 1.8-1.6-1.1 Comparison Example 1 5.0 -2.7 -1.8 Comparative Example 2 3.5 -3.6 -2.3 * Head to Head recorded on commercially available high-band evaporation tape and recorded and reproduced output was 0. The tape of the present invention is a mother tape 11
Is less likely to be demagnetized, and copying on the blank tape 13 having high reproduction output is possible, and high-speed copying is possible, so that mass production of software can be performed at low cost. .

[0031]

According to the present invention, mass production of software can be performed at low cost.

[Brief description of drawings]

FIG. 1 is a schematic view of an oblique vapor deposition apparatus for manufacturing a mother tape and a blank tape.

FIG. 2 is a schematic sectional view of a mother tape.

FIG. 3 is a schematic sectional view of a blank tape.

FIG. 4 is a schematic side view showing the relationship between a mother tape and a blank tape during transfer.

FIG. 5 is a schematic view of a transfer device.

[Explanation of symbols]

 1a Supply side roll 1b Winding side roll 2 Support 3 Cooling can roll 4 Guide roller 5 Crucible 7 Magnetic metal 11 Mother tape 12 Metal magnetic film 13 Blank tape 14 Metal magnetic film 15 Ring type magnetic head 18 Transfer drum

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Shigemi Wakabayashi Inventor Shigemi Wakabayashi 2606 Akabane, Kaiga-cho, Haga-gun, Tochigi Kao Co., Ltd.Institute of Information Science (72) Inventor Akira Shiga 2606 Akabane, Kaiga-cho, Haga-gun, Tochigi Kao Company Information Science Laboratory

Claims (5)

[Claims] 1. A second magnetic recording medium to which an information signal recorded on the first magnetic recording medium is transferred, wherein the first magnetic recording medium has a column in its magnetic film grown obliquely. The second magnetic recording medium is a metal thin film type in which the column in the magnetic film is obliquely grown, and the column in the magnetic film in the second magnetic recording medium is Slope of ₂
Is smaller than the column inclination θ ₁ in the magnetic film of the _first magnetic recording medium. 2. θ ₁ is 20 to 80 ° and θ ₂ is 5 to 5.
The magnetic recording medium for transfer according to claim 1, wherein the magnetic recording medium is 60 °. 3. The magnetic recording medium for transfer according to claim 1, wherein θ ₁ −θ ₂ is 15 to 75 °. 4. A method for transferring an information signal recorded on a first magnetic recording medium to a second magnetic recording medium, wherein the first magnetic recording medium has a column in its magnetic film inclined. The second magnetic recording medium is of a grown metal thin film type, and the second magnetic recording medium is of a metal thin film type in which the columns of the magnetic film are grown obliquely, and the magnetic film of the second magnetic recording medium is The column inclination θ ₂ is the first
Consists of a magnetic recording medium as smaller than the inclination theta ₁ of the column in the magnetic film becomes, the growth of the column in the magnetic layer of the first column in the magnetic layer of the magnetic recording medium of the growth direction second magnetic recording medium A transfer method, wherein the magnetic films are overlapped so that the directions intersect with each other and the magnetic films are positioned inside, and a bias magnetic field is applied from the side of the second magnetic recording medium. 5. The transfer method according to claim 4, wherein the bias magnetic field is applied by a ring type magnetic head.