JPH0830950A - Loading tape for high-speed magnetic transfer system - Google Patents

Abstract

PURPOSE:To ensure very low surface electric resistance and to enable smooth loading without causing entwining or sticking due to electrification by forming a thin film of a metal or metal oxide on one side of a nonmagnetic substrate. CONSTITUTION:A thin film of a metal or metallic oxide is formed on at least one side of a nonmagnetic substrate made of a polymer film to obtain the objective loading tape. The thin film is, e.g. a thin film of antimony-tin oxide, indium-tin oxide or metal palladium but a thin film of indium-tin oxide is preferably used because of its satisfactory transparency, durability and adhesive property of an electrically conductive film. A film of 'Hastelloy(R)' (W-Mo alloy) having higher hardness than indium-tin oxide is preferably formed on the electrically conductive film.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION This invention relates to loading tapes for high speed magnetic transfer systems.

[0002]

2. Description of the Related Art A high-speed magnetic transfer system is a system in which tapes are directly contacted with each other and signals are dubbed. It has become the mainstream of the industrial dubbing method because there is no noise or signal deterioration, and the dubbing speed is 100 times more than the conventional one.

Conventionally, there is no concept of a loading tape dedicated to a high speed magnetic transfer system, and a polymer film such as polyester used as a base of a magnetic tape is simply slit into a tape shape and used as a loading tape.

A loading tape for a high-speed magnetic transfer system is a tape connected to the leading end of the master tape as a leading role when loading a master tape recorded with a signal into the machine when the system is used. Also,
The loading tape needs to be transparent so that the boundary can be detected by an optical sensor.

Inside the high-speed magnetic transfer system, a long master tape of 200 to 300 m is set,
It runs at high speed (several meters / second) and makes a copy while contacting the tape on the dubbing side.
One master tape repeatedly runs tens of thousands of times. Therefore, the clearance in the tape width direction is very narrow in order to prevent deterioration of the master tape and ensure running stability.
It has a mechanism that tends to generate static electricity.

The surface electric resistance of the master tape is about 10 ⁵
It is about Ω / (1/2 inch) ² but is 10 ¹⁴ Ω / (1/2 inch) ² or more for ordinary polymer film, and when an untreated polymer film is used as a loading tape. However, there was almost no antistatic effect, and loading failures frequently occurred due to static electricity.

[0007]

The tape conventionally used as a loading tape does not have the antistatic effect as described above, and when loaded in a high-speed magnetic transfer system, it causes friction with the inside of the machine or the guide, and the tape. Due to static electricity due to contact between each other, entanglement and sticking occurred inside the system, often resulting in poor loading. This phenomenon becomes remarkable especially in an environment of low humidity.

As a method for increasing the conductivity of a conventional loading tape, a method of providing a film layer made of an acrylic surfactant on the film surface and a method of kneading a conductive substance with a polymer substance to form a film are considered. However, the surface electric resistance of these was as high as 10 ⁸ Ω / (1/2 inch) ² or more, and the antistatic effect was not sufficient.

The problem to be solved by the present invention is that the surface electric resistance is extremely low, and the magnetic tape is entangled and stuck as a leader tape during the magnetic tape prod- ing for a high-speed magnetic transfer system. It is an object of the present invention to provide a loading tape for a high-speed magnetic transfer system which can be smoothly loaded without any attachment.

[0010]

Means for Solving the Problems As a result of intensive studies in view of the above situation, the present inventor has made a tape-like film in which a thin film of metal or metal oxide is provided on at least one surface of a non-magnetic support. It has been found that the above problems can be solved by using the product, and the present invention has been completed.

That is, in order to solve the above problems, the present invention provides a loading tape for a high-speed magnetic transfer system in which a thin film of a metal or a metal oxide is provided on at least one surface of a non-magnetic support made of a polymer film. provide.

A leader tape connected to both ends of a magnetic tape housed in a cassette is known as a means for preventing damage due to static electricity. This is mainly a dropout of the magnetic tape due to adhesion of dust and dust. It is provided for the purpose of preventing the increase. And the leader tape is 3.81 to 12.65 mm (1/2 inch)
Width is 6 to 20 cm, and the total thickness is 6 to 20 cm due to tape winding around the hub in the cassette and running problems.
˜40 μm, and the stiffness is about several mg to 1800 mg.

On the other hand, the loading tape is intended to prevent entanglement and sticking inside the machine, and has a length of several ten meters, a total thickness of 20 to 50 μm, and a stiffness of 500 to 2500 mg.
The ones are suitable. If the stiffness value is smaller than this, the strength as a loading tape will be insufficient, causing bending, reversal, entanglement, etc. inside the high-speed transfer system. Conversely, if it is larger than this, the rigidity will be too great and smooth. It is not preferable because it tends to be unable to be loaded.

The surface resistance of the magnetic tape used in the high speed dubbing system is about 10 ⁵ Ω / (1/2 inch) ² ,
As the loading tape, one having a surface electric resistance of 10 ⁴ Ω / (1/2 inch) ² or less is preferable.

Further, in order to detect the boundary with the magnetic tape, the light transmittance of the loading tape in the wavelength range of λ = 400 to 1200 nm is 20% or more which is the detection limit value of the high speed magnetic transfer system. Is preferred.

As the metal thin film or metal oxide thin film provided on the surface of the loading tape, tin oxide-antimony,
Examples thereof include indium-tin oxide and metallic palladium. Indium-tin oxide is preferable from the viewpoints of transparency, durability, good adhesion of the conductive film, and the like.

It is also conceivable to provide a thin film of a metal or metal oxide having a hardness higher than that as a protective layer on the conductive film. This includes Hastelloy (tungsten-molybdenum alloy), nickel-chromium, chromium and the like, but Hastelloy is preferred from the viewpoint of its transparency and adhesiveness.

Further, in order to secure the running property of the loading tape, it is preferable that both surfaces of the loading tape have a surface roughness of 20 nm or more.

[0019]

EXAMPLES The present invention will be described in more detail below with reference to examples and comparative examples.

Example 1 Thickness 33 μm, surface roughness 21
A 400 nm thick indium-tin oxide sputtering layer was provided on one side of a nm PET film and the film was slit to a 1/2 inch width to obtain a loading tape. Λ of this loading tape
The light transmittance at 940 nm was 89%.

(Example 2) Thickness 33 μm, surface roughness 21
A 400 Å thick indium-tin oxide sputtering layer was provided on one side of the nm PET film, and a 50 Å thick Hastelloy sputtering layer was further provided thereon. 1/2 of this film
A loading tape was obtained by slitting into an inch width. The light transmittance of this loading tape at λ = 940 nm is
It was 83%.

(Comparative Example 1) Thickness 33 μm, surface roughness 21
nm PET film was slit into a 1/2 inch width to obtain a loading tape.

Comparative Example 2 Thickness 33 μm, Surface Roughness 34
nm PET film on one side with finely divided silica and a fourth
An acrylic surfactant containing a graded ammonium salt was applied. The film was slit into a 1/2 inch width to obtain a loading tape.

(Comparative Example 3) A conductive material consisting of an equal mixture of Si, Sn and Na was kneaded and mixed to have a thickness of 36 μm.
A PET film having a surface roughness of 37 nm was slit into a 1/2 inch width to obtain a loading tape.

Regarding the above five loading tapes,
According to the following method, surface electric resistance, abrasion resistance and stiffness are measured, and further, a loading test to an actual magnetic transfer system is performed according to the following method,
The results are shown in Tables 1 and 2 below. The unit of surface electric resistance in the table is Ω / (1/2 inch) ² .

Surface electric resistance A tape having a width of 1/2 inch is placed on a rubber sheet with the surface to be treated facing upward, and round bar electrodes having an interval of 1/2 inch are placed on the tape, and a voltage of about 0.3 V is applied to both ends. The resistance when a voltage was applied was used as the evaluation value.

Abrasion resistance A 1/2 inch wide tape is placed on the glass surface with the treated surface facing up, and the tape surface is a friction sheet (CAT.
NO.413 series) slide 100 times with 100 g / cm ² load,
Observation of scratches on the tape surface and changes in surface electric resistance were measured.

Using a Stiffness Loop Stiffness Tester (manufactured by Toyo Seiki Co., Ltd.), a tape having a width of 1/2 inch was formed into a loop having a length of 8 cm, and the repulsive force when the tape was crushed to a width of 20 mm was measured.

Loading Each loading tape was used for TMD (Thermal Magnetic Duplicator: manufactured by Otari Co., Ltd.), which is one of the high-speed magnetic transfer systems, and an experiment was conducted by changing the humidity to see whether or not it was effective against loading failure. Usually, these magnetic transfer systems are used in a stable environment of about 20 ± 5 ° C., and the experiment was conducted at 18 ° C.

[0030]

[Table 1]

[0031]

[Table 2]

From the results shown in Table 1 and Table 2, Example 1
It can be understood that the loading tapes of Nos. 1 and 2 exhibited a very low surface electric resistance as compared with the loading tapes of Comparative Examples 1, 2 and 3, and that they could be loaded without problems even in the actual loading test. In particular, with the loading tape of Example 2, very good results were obtained even in the abrasion resistance test, and with the loading tape of Example 1, some scratches on the surface were observed in the abrasion resistance test, It had a low enough resistance and had no practical problems.

On the other hand, in the loading tape of Comparative Example 3, loading failure occurred in both cases of RH 70% and RH 40%.
It can be understood that a defect occurs at H40%, which is an insufficient loading tape.

[0034]

The loading tape according to claim 1 of the present invention has a thin film of metal or metal oxide, which is a good conductor, provided on a non-magnetic support, so that it is entangled during loading into a high-speed magnetic transfer system. -It has a particularly remarkable effect that sticking is extremely unlikely to occur.

Further, the loading tape according to claim 4 of the present invention has the abrasion resistance because the metal or metal oxide film having a higher hardness than that is further provided on the metal or metal oxide thin film. It also has the effect of being excellent.

Claims (5)

[Claims] 1. A loading tape for a high-speed magnetic transfer system, comprising a metal or metal oxide thin film provided on at least one surface of a non-magnetic support made of a polymer film. 2. The loading tape for a high speed magnetic transfer system according to claim 1, wherein the thin film is provided by vapor deposition or sputtering. 3. The loading tape for a high-speed magnetic transfer system according to claim 1, wherein the thin film is indium-tin oxide. 4. The high-speed magnetic transfer system according to claim 1, wherein a metal or metal oxide film having a hardness higher than that of the metal or metal oxide thin film is provided on the metal or metal oxide thin film. Loading tape. 5. The loading tape for a high-speed magnetic transfer system according to claim 4, wherein the metal or metal oxide coating having a hardness higher than that of the metal or metal oxide thin film is a tungsten-molybdenum alloy.