JPH0462130B2 - - Google Patents

Description

[Detailed description of the invention]

INDUSTRIAL APPLICATION FIELD The present invention relates to a tape running drive tape for a magnetic transfer device, that is, a magnetic transfer device that performs contact magnetic transfer, and relates to a master tape (also referred to as a mother tape) on which magnetic recording is performed and the recorded contents thereof. The present invention relates to a so-called driving tape for overlapping and driving a copy tape to be transferred. Background technology and its problems With the spread of magnetic recording and reproducing devices such as video tape recorders and audio tape recorders, the demand for various soft tapes has increased, and it has become possible to create large quantities of copy tapes from master tapes that have already been magnetically recorded. is necessary. The method for creating such a copy tape is as follows:
A dubbing method involves re-recording the recorded signal obtained by playing back from a master tape onto a recording tape, and a method of magnetically transferring the residual magnetization pattern created by the magnetic recording of the master tape to an unrecorded tape, that is, a copy tape by contacting it. A contact magnetic transfer method is being considered. Conventionally, the dubbing method described above has been the mainstream, and for example, a method is adopted in which a signal from a master reproducing device for reproducing a master tape is sent to a plurality of copy tape recorders and re-recorded on each copy tape. However, when using this dubbing method, at least a master tape player and a copy tape recorder are required, making the equipment large and expensive, and there is only the problem of signal deterioration due to the signal reproduction and recording process. In particular, when recording tracks are formed diagonally with respect to the tape running direction, such as in the case of a video tape recorder, there may be variations in the recording track pattern due to mechanical variations in the rotary head device of the copy tape recorder. This causes problems such as deterioration of compatibility. In recent years, with the development of high residual magnetization tapes as master tapes and advances in magnetic transfer technology, the above-mentioned magnetic transfer method using contact magnetic transfer has come into wide use. This type of magnetic transfer device will be briefly described with reference to FIG. 5 is a supply side reel and a take-up side reel of the copy tape C to which the magnetization pattern on the master tape M, that is, the recorded content is transferred by contact; 5 is a rotating drum that brings the master tape M and the copy tape C into close contact;
6 is a guide that regulates the tape height position when the master tape M and copy tape C are brought into close contact; 7 is a height position regulation guide for the copy tape; 8 is a magnetic head for applying a transfer magnetic field; 9 is a capstan for driving the driving tape. , 10 is the pinch roller, 11
12 and 13 are the supply side reel and take-up side reel of the driving tape D, and 14 is a height position regulating guide of the driving tape D. With such a device, the master tape M and the copy tape C are transferred to their supply reels 1 and 3, respectively.
The winding reels 2 and 4 are then transferred to the take-up reels 2 and 4. These tapes M and C are clamped between the transfer magnetic head 8 and the rotary drum 5 in front of the transfer magnetic head 8 and transferred therebetween. In other words, the magnetization pattern on the master tape M is copied by overlapping the drums 5 so as to be in close contact with each other in an angular range of 120° on the outer peripheral surface of the drum 5, and guiding them in close contact with the head 8. In this case, the driving tape D contacts the tapes M and C wound around the rotating drum 5 from the outside thereof, that is, from the magnetic head 8 side. However, since both tapes M and C are brought into pressure contact with the outer circumferential surface of the rotating drum 5, the relative positions of these three tapes M, C and D in the tape running direction may deviate from each other. In other words, the tapes M and C are driven to run in a constant relative position, so that the transfer is performed reliably and with high fidelity. The driving tape in this transfer device is
Generally, plastic films such as polyester are used as they are. However, when such a driving tape made of plastic film is used, the surface of the plastic film comes into direct contact with the transfer head, so the film surface is easily damaged and the pressure distribution when the transfer head is pressed is widened. Another drawback is that it becomes difficult to ensure stable running due to the charging phenomenon that accompanies high-speed running. Purpose of the Invention In the present invention, in the tape for driving the tape running of the transfer device, that is, the driving tape, when this driving tape is used, it is possible to prevent the running deviation and fixation of the above-mentioned tape, master tape, and copy tape. This prevents damage from the guides and provides durability and appropriate friction on the contact surface between the driving tape and the fixed transfer head. Moreover, it is possible to obtain an antistatic effect in this driving tape. Summary of the Invention In the present invention, as shown in FIG.
A nonmagnetic layer 2 is provided in which one or more types of nonmagnetic powders such as Al ₂ O ₃ , a-Fe 2 O _{3 ,} SiO ₂ , CaCO ₃ are dispersed in a binder resin. Examples Example 1 Carbon black 100 parts by weight Polyurethane resin 50 parts by weight Vinyl chloride-vinyl acetate copolymer 50 parts by weight Solvent (1:1:1 mixed solution of methyl ethyl ketone and acetone) 300 parts by weight of the composition After mixing and dispersing, 10 parts of a hardening agent Desmodyur L (trade name manufactured by Bayer AG) was added and mixed for 30 minutes. A nonmagnetic layer 2 was formed to a thickness of 2 μm on a nonmagnetic support 1 made of polyethylene terephthalate with a thickness of 120 μm. was applied. Example 2 A driving tape was constructed in the same manner as in Example 1, except that 10 parts by weight of Al ₂ O ₃ powder was used in place of the carbon black in the composition of Example 1. Table 1 shows the mechanical and electrical properties of each tape according to Example 1 and Example 2. In addition, in the same table, the comparative example shows each characteristic of a conventional driving tape made of polyethylene terephthalate film.

[Table] As is clear from this, in the case of the present invention, by reducing the electric resistance, charging due to friction is prevented, stable and good running performance is obtained, and damage caused by the magnetic head is also prevented. It wasn't discovered.

[Brief explanation of the drawing]

FIG. 1 is a schematic structural diagram of a magnetic transfer device used to explain the present invention, and FIG. 2 is a schematic enlarged sectional view of an example of a tape drive tape of the magnetic transfer device according to the present invention. 1 is a magnetic support, and 2 is a nonmagnetic layer.

Claims (1)

[Claims] 1 One or more kinds of non-magnetic powders such as carbon, Al ₂ O ₃ , α-Fe ₂ O ₃ , SiO ₂ , CaCO ₃ are dispersed in a binder resin on both sides or one side of a non-magnetic support. A drive tape for tape running in a magnetic transfer device, characterized by being provided with a non-magnetic layer.