JPH03214427A - Magnetic tape transfer device - Google Patents

Abstract

PURPOSE:To increase the bias magnetic field in a perpendicular direction and to sufficiently magnify transfer output by forming a transfer drum with a material of high permeability, and forming a transfer tape with an evaporation tape of iron-cobalt system. CONSTITUTION:The transfer tape 12 and a tape 13 to be transferred whose feed are guided with the transfer drum 14 in a state where the tapes 12, 13 are superimposed are pressurized contact with a pressure contact mechanism 15 mutually. Also, the drum 14 is formed with the material with high permeability in which nickeling is applied on the surface of electromagnetic soft iron. The tape 12 is formed by using the evaporation tape of iron-cobalt system. At such a case, the drum 14 is slided, and the tapes 12, 13 are interposed, and compressed air introduced to an air chamber 15b is blown out from the aperture of a circular arc plane 15a. Then, the tapes 12, 13 are pressurized contact with the circumferential plane 14a of the drum 14, and their magnetic planes are pressurized contact with each other. In such a way, it is possible to increase the bias magnetic field in the perpendicular direction, and to sufficiently magnify the transfer output by adding a magnetic field in the demagnetization hard axial direction of a crimp-style tape.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a transfer tape called a master tape, a mirror mother tape or simply a mother tape, and a transfer tape called a slave tape, a copy tape or a blank tape. The present invention relates to a magnetic tape transfer device in which signals on the transfer tape can be transferred to the transfer tape by overlapping transfer tapes and applying a bias magnetic field (transfer magnetic field).

[Summary of the invention 1] The present invention comprises a transfer drum in which a transfer tape and a transfer tape are run in a superimposed state, and a tape pressure contact structure in which the magnetic surfaces of the transfer tape and the transfer tape guided by the transfer drum are brought into pressure contact. and. In a magnetic tape transfer device equipped with a magnetic head that transfers data to a transferred tape using a signal bias magnetic field of transfer tapes that are pressed against each other by the sides of the tape pressure welding machine, the transfer drum is formed of a high magnetic permeability material.
By mainly using the perpendicular component of the bias magnetic field output from the magnetic head as the transfer magnetic field, and by using an iron-cobalt vapor-deposited tape as the transfer tape, it is possible to create a transfer tape with high coercive force. This design allows for sufficient transcription output to be obtained even for large numbers of people. [Prior art] As a magnetic tape transfer device of this type,
The one described in Publication No. 004 is widely known. This transfer device uses a master tape (as shown in Figure 5).
A transfer drum (cab stand drum) 3 that guides the transfer tape 1 and the slave tape 2 (transfer tape) with their magnetic surfaces overlapped and presses the mutual magnetic surfaces of both tapes 1.2. Pressure welding device 4 and the pressure welding device 4
The master tape l and the slave tape 2 are moved at high speed along the circumferential surface of the transfer drum 3, and the master tape l is moved by a pressure welding device 4.
The magnetic surface of the slave tape 2 is brought into pressure contact with the magnetic surface of the slave tape 2, and the magnetic head 5 applies a mainly horizontal bias magnetic field to the pressure contact portion, thereby transferring the signal of the master tape l to the slave tape 2.
It is now being transcribed into . Note that 6 and 7 are supply reels and take-up reels that respectively supply and take up the master table I and the slave tape 2; 8 is a pinch roller that works together with the transfer drum 3 to drive the mask tape I and the slave tape 2; 9 is an air chamber that keeps the tension of the tape 1.2 stable during running, and IO...IO are guide rollers. Further, the pressing device 4 is movable in the directions of arrows a and b, and by moving in the direction of arrow a, the master tape l and the slave tape 2 are pressed against the peripheral surface of the transfer drum 3.

By the way, in the above conventional magnetic tape transfer device, a so-called metal-coated tape is used as the master tape (transfer tape), and BaF is used as the slave tape (transfer tape).
When performing transfer using an e-table (valium ferrite table), use a Co-gamma tape (
There was a problem in that the amount of demagnetization of the master tape was significantly increased compared to the case where a cobalt gamma tape was used.

This is because BaFe tapes tend to require a larger bias magnetic field (transfer magnetic field) to obtain the maximum transfer output than Co-γ (cobalt gamma tapes).
1Iii & R of the master tape is promoted by this large bias magnetic field when transferring Ba Fe tape as slave tape 2. It is.

Therefore, the applicant first used a soft magnetic metal (iron) as the rotating drum 3, and increased the vertical component of the bias magnetic field by attracting the bias magnetic field of the magnetic head 5.
We proposed to improve the transfer characteristics.

[Problems to be Solved by the Invention] By the way, according to the magnetic tape transfer device as described above, since the transfer drum is made of soft iron with high magnetic permeability, the vertical component of the bias magnetic field increases as described later. Magnetic transfer is performed with the horizontal component reduced, and high transfer efficiency is obtained.
When using a metal tape with high coercive force, such as the one used in the i+ video tape, there is still the problem that a sufficient transfer output cannot be obtained.

For example, coated metal table (coercive force "F 2000")
Even if the mother tape is used as a mother tape, the transfer output obtained when a BaFe tape is used as the covey tape is approximately -3. The output decreases by 5 dB, and a sufficient transfer output cannot be obtained as a video tape. (OdB is the output when a metal tape is used as a mother tape) [1,000 Steps to Solve the Problems The present invention was made in view of these problems, and as a mother tape, the coercive force is lower than that of conventional metal tapes. but,
An iron-cobalt vapor deposition tape that can output relatively large lines of magnetic force is used, and magnetic tape transfer is performed by applying a perpendicular bias magnetic field to the vapor deposition tape.

[Effect 1: It is easier to increase the magnetism of recorded signals with vapor-deposited tape than with conventional metal tapes, so if this vapor-deposited tape is used as a mother tape, the mother tape will generate approximately 6 dB higher output as shown in Figure 6. As a result, the transfer output increases, and it is possible to obtain a transfer output of O dB, which is a practical output level even for, for example, an 8 ml metal table.

Further, by performing the transfer with a vertical bias magnetic field, H641 is reduced even when the coercive force is low, and the transfer output does not decrease due to lItis even if magnetic transfer is performed many times.

[Embodiment 1] FIG. 1 shows a magnetic tape transfer device showing one embodiment of the present invention. In this figure, an electric tape transfer device 11 includes a transfer drum l4 that guides the running of a transfer tape (hereinafter referred to as a mask tape) 12 and a transfer tape (hereinafter referred to as a slave tape) 13 in a superimposed state, and the transfer drum l4. Horizontal tape welding machine 15 that presses the magnetic surfaces of mask tape l2 and slave tape l3 guided by l4
and a magnetic head l6 for transferring the signals of the mask tapes 12, which are pressed against each other by the horizontal tape welding machine 15, to the slave tape 13. The transfer drum l4
is made of a high magnetic permeability material with nickel plating applied to the surface of electromagnetic soft iron, and its horizontal surface 14a guides the movement of the mask table 12 and slave table 13.

It is rotatably driven by a motor (not shown) connected to the rotating shaft 14b, and can be moved close to or away from the table pressure welding mechanism 15 by sliding it in the direction of the arrow with an air actuator (not shown). It is now possible to do so. Further, the side 15 of the tape pressure welding machine has a surface facing the transfer drum l4 as a circumferential surface 14a of the drum l4.
It is formed into an arcuate surface 15a having approximately the same curvature as the curvature of
An air chamber 15b having an open end at one end is provided in the center of the arc 15a; a head housing cap 15d attached to the upper surface of the head housing 15c; and a head housing cap 15d attached to the lower surface of the head housing 15c. The head housing base 15e is connected to an air hose 15f for supplying compressed air from an air compressor (not shown) to the air chamber 15b. Then, when the transfer drum 14 is slid by the air actuator, the mask table l2 and slave table l3 are sandwiched between the transfer drum l4 and the compressed air introduced into the air chamber 15b is applied to the arc surface 1.
By ejecting from the opening provided in the center of 5a,
Transfer slave table l3 and mask table l2 to transfer drum l
The magnetic surfaces of the slave table l3 and the mask tape 12 are brought into pressure contact with each other.

The magnetic head l6 includes a bias head 16a having a magnetic gap at its tip, a coil 16b wound around the bias head 16a, and a head ring 16c. The head holder 16c is mounted within the head housing 15c by being sandwiched between the head housing cap 15d and the head housing base 15e, and is attached to the peripheral surface 14a of the transfer drum l4.
A bias magnetic field is applied to the slave table 13 and the mask table l2 traveling on the slave table 13 and the mask table l2.

Next, attach the Ba Fe tape to the slave tape and vapor deposition tape (
A description will be given of the case where a mother tape (iron-cobalt type) is used and the magnetic tape transfer device performs transfer while applying a bias magnetic field in the perpendicular direction.

Figure 2 shows data showing the easy and difficult demagnetization axes based on the anisotropy of magnetic tape. In this figure, the horizontal axis shows the strength of the magnetic field (κ·Gauss) applied during demagnetization, and the vertical axis shows the amount of demagnetization (dB). (The larger the amount of demagnetization, the larger the amount of magnetization.) When the magnetic field is increased, the amount of demagnetization in the horizontal direction (longitudinal direction of the tape) of the Ba Fe tape is shown by ▲, and the amount of demagnetization in the vertical direction is shown by Δ. The direction delifllL increases rapidly.

In other words, in the case of the BaFe tape, there is not much difference between the horizontal direction and the vertical direction, and it can be said that it is a medium in which both directions are easy axes of magnetization.

On the other hand, the amount of demagnetization in the longitudinal direction (horizontal direction) of the vapor-deposited tape, which is used as a mother tape, is indicated by ●, and the amount of demagnetization in the vertical direction is indicated by ○. From this curve, it can be seen that the vapor-deposited tape is an anisotropic magnetic medium that is relatively easily erased by a magnetic field in the horizontal direction, but is relatively hard to disappear in the vertical direction.

Therefore, if the bias magnetic field required for transfer is Ba
Assuming that the Fe tape can be demagnetized by -20 dB, in order to be sufficiently magnetized by applying a bias magnetic field in the longitudinal direction with this magnetic field, the vapor-deposited tape that becomes the mother tape must be - 6. With demagnetization of 8 dB, 61fi (Ml) is removed by that difference.

However, when applying a bias in the vertical direction to demagnetize by the same amount, the demagnetization of the vapor-deposited tape that becomes the mother tape is -1.3 dB, as shown by the two-dot chain line, so the magnetic transfer by the vertical bias magnetic field is As a result, 5. This results in a 5 dB increase in transfer output.

Further, in the embodiment of the present invention, an iron-cobalt-based vapor-deposited tape is used as the mother tape, and its coercive force is smaller than that of a conventional metal coated tape, for example, Hc#15.
000e, the transfer output can be increased by about 6 dB in FIG. 6 described above.

Therefore, even if the slave tape is a tape compatible with metal, the transfer output can be increased by about 3.5 dB, and a sufficient transfer output can be obtained.

This is because the recording magnetic field easily becomes high when recording the original signal on the mother tape.

Therefore, as described above, even when the slave tape is a metal type 8 mm tape, a sufficient transfer output can be provided.

Note that as the coercive force Hc decreases, the amount of demagnetization caused by the bias magnetic field applied during transfer generally increases. In other words, as shown in Figure 3, generally speaking, the lower the coercive force of a tape, the stronger the magnetic field of the recorded signal can be. The output (output/output before transfer) tends to increase as the coercive force HC increases.

However, the tendency of the demagnetization rate to change as described above only appears during the first transfer, and experiments have shown that the demagnetization rate does not increase much during subsequent transfers, and the output does not decrease much due to transfer.

Therefore, in the case of vapor-deposited tape, as shown in Figure 4, compared to the mother tape, the amount of lB+ demagnetized by the initial demagnetization rate is larger than the amount B2 due to the metal tape, but the subsequent transfer output remains almost constant. It is assumed that it will fall.

Then, a vapor-deposited tape that can make the initial transfer output A, larger than the transfer output A2 of the metal tape will be able to maintain a large transfer output as a result, and even if the slave tape is a tape that corresponds to metal, a large value will be obtained. can provide a magnetic field transfer output of

[Effects of the Invention j As explained above, the magnetic tape transfer device of the present invention has the following effects:
By using a soft magnetic metal for the rotating drum, we can increase the bias magnetic field in the vertical direction, and by applying a magnetic field in the direction of the difficult-to-demagnetize axis of the vapor-deposited tape, we can reduce the amount of demagnetization and reduce the coercive force of the vapor-deposited tape compared to conventional methods. By using a material with a coercive force lower than the coercive force of metal tape, the transfer output is made thicker, so the recording current can be reduced even for metal-compatible tapes for which it would not previously be possible to obtain sufficient transfer output. This has the effect that it is possible to provide a transfer output magnetic field comparable to that obtained by the conventional method.

[Brief explanation of drawings]

Fig. 1 is a side view showing the main parts of a transfer device according to an embodiment of the present invention, Fig. 2 is a graph showing how electrical tape is demagnetized by a bias magnetic field, and Fig. 3 is a graph showing coercive force and output magnetic field. 4 is a graph showing the output level of the transfer magnetic field, FIG. 5 is an explanatory diagram showing an overview of the magnetic tape transfer device, and FIG. 6 is a graph showing the relationship between mother tape output and transfer output. This is a graph showing. In the figure, l2 is a transfer tape (vapor deposition tape), l3 is a transfer tape, 14 is a rotating drum, and l6 is a magnetic head.

Claims (1)

[Scope of Claims] A magnetic device comprising: a transfer drum that travels while pressing a transfer tape and a transfer tape in a superimposed state; and a magnetic head that is disposed opposite to the transfer drum and outputs a bias magnetic field. In the tape transfer device, the transfer drum is formed of a high magnetic permeability material, and
A magnetic tape transfer device characterized in that the transfer tape is an iron-cobalt based vapor deposited tape.