JPH0514966B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an orienting device for a magnetic recording medium that performs magnetic field orientation of a magnetic tape that enables high-density recording and reproduction of information.

[Conventional technology]

Conventional magnetic recording media, such as magnetic tapes such as video tapes, are produced using a method in which magnetic powder is oriented in the same direction as the running direction of the magnetic tape C, that is, the recording and reproducing direction of the magnetic head 2, as shown in FIG. is known. In this case, the magnetic head 2
The gap is oriented parallel to the running direction of the magnetic tape C.

However, in this way, recording by the magnetic head 2
When magnetic powder is oriented in the same direction as the reproduction direction, that is, in the longitudinal direction of the tape, the ratio of the diameter D to the length L of the acicular uniaxial particles 1 of the magnetic powder is about 1/10, as shown in FIG. , as shown in FIG.
The recording/reproducing information density is limited depending on the length of the magnetic head 2, and various problems have arisen such as the width of the gap of the magnetic head 2 itself having to be adjusted to the length L of the acicular uniaxial particle 1. .

One way to solve this problem is to orient the acicular uniaxial particles in a magnetic field so that their length direction is along the tape width direction, which is perpendicular to the tape longitudinal direction. As a means, permanent magnets are arranged so as to sandwich the tape from the width direction, and the opposing surfaces of the permanent magnets are
There are some that form a magnetic field in the tape width direction by forming a pole or an S pole. However, in such a configuration, there are problems such as the need for a large magnet in order to obtain sufficient magnetic field strength.

[Problem to be solved by the invention]

The present invention has been made in view of the above circumstances, and its purpose is to orient the acicular uniaxial particles of a magnetic recording liquid in a magnetic field so that the length direction thereof is along the tape width direction perpendicular to the tape longitudinal direction. An object of the present invention is to provide an orientation device for a magnetic recording medium that has a relatively simple configuration, can efficiently perform magnetic field orientation, and can easily and reliably manufacture a magnetic recording medium that can increase the density of information. .

[Means to try to solve the problem]

In order to achieve the above object, the present invention has the following configuration. In the case of an orientation device for magnetic tape such as video tape, acicular uniaxial particles of the magnetic recording liquid applied to the base tape are spread over the length so that the magnetic head can record and reproduce data in a direction perpendicular to the gap direction. In the method of orienting the magnetic field along the tape width direction, which is perpendicular to the tape longitudinal direction, a ring-shaped solenoid is arranged so that its winding center axis is perpendicular to the tape longitudinal direction, and
The tape has a flat shape that extends long in the longitudinal direction.
At both longitudinal ends of the tape of this flat solenoid,
A tape inlet and a tape outlet are respectively formed so that the tape can pass through the internal space of the solenoid.

〔Example〕

Embodiments of the present invention will be described below based on the drawings. FIGS. 1 to 4 show examples of the magnetic tape A.

The magnetic tape A is oriented by an orientation device 13 after a magnetic recording liquid 12 is applied to a base material 11 made of synthetic resin and before drying. The orientation device 13 is composed of a solenoid 13a wound in a flat ring shape.

The solenoid 13a has a magnetic field that is aligned with the winding center line 1.
4 from one opening 15 to the other opening 1
5, and arranged so that the winding center line 14 is perpendicular to the longitudinal direction (running direction) of the magnetic tape A, and is compressed from above and below so as to extend long in the longitudinal direction of the tape. has been done. An inlet 13b is formed on one side perpendicular to the winding center line 14 of the solenoid 13a, and an outlet 13c is formed on the other side.

As shown in FIG. 7, the solenoid coil 13d is arranged parallel to the longitudinal direction of the magnetic tape A, and is turned to the back side avoiding the inlet 13b and the outlet 13c, and is turned outward at both longitudinal ends of the tape. It has a deformed ring-like structure that protrudes.

Then, the undried magnetic tape A, which has just been coated with the magnetic recording liquid 12 on the base material 11, is introduced through the inlet 13b of the solenoid 13a, and is discharged from the outlet 13c. A magnetic recording liquid 1 is applied to the base material 11.
It goes without saying that No. 2 is applied to a uniform thickness by the application device.

By the way, the magnetic field in the vicinity of the inlet 13b and the outlet 13c of the solenoid 13a is not applied to the transverse direction of the magnetic tape A due to the above-described coil configuration, but is disturbed, so that the magnetic field is not applied to the magnetic tape A in the transverse direction, and therefore the magnetic field is not applied to the magnetic tape A in the lateral direction, so that the magnetic field in the vicinity of the inlet 13b and the outlet 13c of the solenoid 13a is disturbed. It is necessary to fix the orientation state so that the state that has been painstakingly oriented is never disturbed. Therefore, the solenoid 13a is stored in a dryer and dried to a certain extent so that at least the orientation is not disturbed. Alternatively, drying is performed so that the orientation can be fixed by using the opening 15 of the solenoid 13a and blowing hot air through the opening 15. If the magnetic tape A discharged from the outlet 13c of the solenoid 13a is not sufficiently dried, final drying is further performed.

Therefore, the magnetic tape A is oriented transversely in the plane with respect to the running direction of the magnetic tape A, as shown in FIGS. 1, 3, and 4. The orientation device 13 consists of a flat solenoid 13a that is long in the magnetic tape running direction, and moves so that the magnetic tape penetrates the center of the magnetic field, so despite its relatively compact configuration, it generates a strong force that concentrates on the tape. A magnetic field can be formed in the longitudinal direction of the tape, and orientation in the tape width direction can be easily and reliably performed.

When recording/reproducing on the magnetic tape A with the magnetic head 16, as shown in FIG. magnetic head 1
This is done by arranging a gap of 6 and running the magnetic tape A in the direction shown by the arrow in FIG. As a result, since the acicular uniaxial particles are positioned parallel to the recording/reproducing direction of the magnetic head 16, the amount of information is higher than before by the ratio of the axial length and diameter of the acicular uniaxial particles. Densify.

〔Effect of the invention〕

As described above, the magnetic recording medium orienting device according to the present invention includes a flat ring-shaped solenoid arranged so that its winding center line is perpendicular to the longitudinal direction of the tape, and the magnetic flux generated by the solenoid is perpendicular to the magnetic flux generated by the solenoid. Because the tape is inserted through it, strong magnetic field alignment can be achieved with a relatively simple and compact configuration, and the acicular uniaxial particles of the magnetic recording liquid are oriented in the width direction of the tape, increasing the density of information. A magnetic recording medium can be manufactured easily and reliably.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram of a partial plane of a magnetic tape showing an embodiment of the magnetic recording medium orientation method according to the present invention, FIG. 2 is a perspective view of the magnetic tape orientation apparatus of FIG. 1, and FIG. Figure 2 is a perspective view illustrating the orientation of the magnetic tape by the orientation device, Figure 4 is an explanatory diagram of the state in which information is recorded and reproduced by the head on the magnetic tape in Figure 3, and Figure 5 is the conventional magnetic tape. An explanatory diagram illustrating the orientation on the tape and the recording and reproducing of information by the head. Figure 6 is a front view showing acicular uniaxial particles of magnetic powder. Figure 7 shows the winding state of the coil in the solenoid in Figure 2. , A is a schematic plan view, and B is a schematic side view. A... Magnetic tape, 11... Base material, 12, 21
... Magnetic recording liquid, 13 ... Orientation device, 13a ...
Solenoid, 13b...inlet, 13c...outlet, 14...center line of winding, 15...opening,
16...Head.

Claims (1)

[Scope of Claims] 1. Acicular uniaxial particles of a magnetic recording liquid applied to a base tape are arranged so that the length direction thereof is in the longitudinal direction of the tape so that a magnetic head can record and reproduce data in a direction perpendicular to the gap direction thereof. An orienting device for a magnetic recording medium that orients a magnetic recording medium along a tape width direction perpendicular to the tape width direction.
The tape has a flat shape that extends long in the longitudinal direction.
At both longitudinal ends of the tape of this flat solenoid,
A device for orienting a magnetic recording medium, characterized in that a tape inlet and a tape outlet are respectively formed so that the tape can pass through an internal space of a solenoid.