JP2933940B2 - Magnetic head of magnetic tape unit - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Summary] The present invention relates to a magnetic head of a magnetic tape device used as a file device of a computer system. The purpose of this machine is to provide a highly reliable magnetic tape device that eliminates uneven wear of the head and greatly extends the life of the magnetic tape and magnetic head. In the magnetic head of the magnetic tape device which discharges air from the air discharge port and floats the magnetic tape, a gap equivalent to the width of the magnetic tape is provided on both sides of the magnetic tape at the position of the air discharge port on the sliding surface of the magnetic tape. And a convex portion is provided, and the magnetic tape is caused to run in the convex portion.

[Industrial applications]

The present invention relates to a magnetic head of a magnetic tape device used as a file device of a computer system.

[Conventional technology]

FIG. 4 is a diagram illustrating a conventional magnetic head and a tape running system around the magnetic head.

The tape guide 6 secures the angle at which the magnetic tape 5 slides on the magnetic head 1, that is, the enclosure angle, at a predetermined value, and at the same time, regulates the vertical position at which the magnetic tape 5 slides to keep the positional relationship between the magnetic head 1 and the magnetic tape 5 constant. To keep.

The magnetic head 1 has a head gap on the surface in sliding contact with the magnetic tape 5 and performs data writing / reading. In this case, the contact surface pressure between the magnetic tape 5 and the magnetic head 1 needs to be kept at a predetermined value, and the contact surface pressure keeps the tape tension applied to the magnetic tape 5 from a tape drive system (not shown) constant. It is secured by keeping.

Further, the magnetic head 1 is provided with an air discharge port 2 on the sliding surface of the magnetic tape 5, and the air
Is supplied, air is discharged from the air discharge port 2, and the magnetic tape 5 floats.

The case where air is discharged from the air discharge port 2 is as follows.

When the magnetic tape 5 stops running, the air discharge port 2
And the magnetic tape 5 is levitated.

When the magnetic tape 5 is to be wound at high speed (fast forward) or fast to rewind (fast rewind), air is discharged from the air discharge port 2 to float the magnetic tape 5.

 That is all.

 The reason is described below.

In the case of (1), the friction resistance between the magnetic tape 5 and the magnetic head 1 is reduced, which is generally called a measure against static friction.

In the case of (1), when writing / reading of data to / from the magnetic tape 5 is not performed, that is, high-speed winding (fast-forward) or high-speed rewinding (fast-rewind) of the magnetic tape 5
In this case, the stress caused by friction caused by the magnetic tape 5 slidingly contacting the magnetic head 1 is eliminated.

 That is all.

FIG. 5 is a diagram for explaining a floating state of the magnetic tape.
(A) is a front view of a magnetic head, (b) is AA of (a).
Sectional drawing, (c) is a BB side view of (a).

As shown in the drawing, when the discharge air 8 is discharged from the air discharge port 2, an air layer is formed between the magnetic tape 5 and the magnetic head 1, and the magnetic tape 5 floats.

[Problems to be solved by the invention]

The air levitation method of the magnetic tape described above is widely used because it can satisfactorily eliminate static friction.

However, the magnetic tape may vibrate during high-speed running of the magnetic tape, that is, during high-speed winding (fast-forwarding) or high-speed rewinding (fast-rewinding). At times, the magnetic tape may be damaged.

The vibration of the magnetic tape is generated because the flow of the discharge air from the air discharge port is disturbed when the magnetic tape runs at a high speed. A typical vibration example will be described.

FIG. 6 is a diagram illustrating a vibration state (1) of the magnetic tape. FIG. 7 shows the vibration state (2) of the magnetic tape.
FIG.

The vibration state (1) in FIG. 6 is caused by the magnetic tape 5 floating in an arc shape, and is generated by the magnetic tape 5 repeating the states of FIGS. 6 (a) and 6 (b). I do.

The reason why the magnetic tape 5 floats in an arc shape is that the air discharge port 2
Is easy to flow in the side portion of the magnetic tape 5, that is, in the width direction.

However, when the magnetic tape 5 has an arcuate shape as shown in FIG. 3A, the discharge air on the side of the magnetic tape 5 becomes difficult to flow,
As a result, the discharge pressure at the side of the magnetic tape increases, and the discharge air 8 flows as shown in FIG. Thus, the magnetic tape repeats the states of (a) and (b), causing vibration.

When such vibration occurs, the side of the magnetic tape 5 comes into contact with the magnetic head 1, causing stress or damage to the magnetic tape 5 at the contact point 9. Also, in the magnetic head 1, only the contact point 9 wears rapidly,
Uneven wear occurs.

Also in the vibration state (2) in FIG. 7, the magnetic tape 5 floats in an arc shape, and the cause is the same as in the vibration state (1) in FIG.

However, in the case of the vibration state (2) in FIG. 7, the discharged air 8 flows out from one side of the magnetic tape 5 rapidly, and as a result, the state of the magnetic tape is as shown in FIG. Thus, the magnetic tape 5 repeats the states of (a) and (b), causing vibration.

When such vibration occurs, the side of the magnetic tape 5 opposite to the air discharge side comes into contact with the magnetic head 1 at the contact point 9.

Therefore, as in the case of the vibration state (1), the magnetic tape 5 is stressed or damaged, and only the contact portion 9 of the magnetic head 1 is rapidly worn, resulting in uneven wear.

The technical problem of the present invention is to solve such a problem in the conventional magnetic head and to prevent the vibration of the magnetic tape from occurring, thereby eliminating the stress and damage of the magnetic tape and the uneven wear of the magnetic head, It is an object of the present invention to realize a highly reliable magnetic tape device in which the life of a magnetic tape and a magnetic head is greatly extended.

[Means for solving the problem]

The vibration of the tape can be eliminated by releasing air in the tape running direction.

FIG. 1 is a perspective view illustrating the basic principle of the present invention.

In a magnetic head of a magnetic tape device which discharges air from an air discharge port 2 provided on a magnetic tape sliding contact surface 11 of a magnetic head 1 and floats a magnetic tape, an air discharge port position of the magnetic tape sliding contact surface 11 is determined. Protrusions are provided at the same positions on both sides of the magnetic tape at intervals equal to the width of the magnetic tape, and the magnetic tape runs within the protrusions.

[Action]

2A and 2B are diagrams for explaining the operation of the magnetic head according to the present invention, wherein FIG. 2A is a front view of the magnetic head, and FIG. 2B is a side view of the magnetic head.

In the magnetic head of the present invention, guides 10 are provided on both sides of the magnetic tape at the position of the air discharge port 2 on the magnetic tape sliding contact surface 11.

Therefore, the discharge air 8 flowing out from the side of the magnetic tape 5 is reduced, and flows in the length direction of the magnetic tape 5 as shown in FIG.

Therefore, the discharge air 8 discharged from the air discharge port 2 is
The magnetic tape 5 is uniformly distributed on the magnetic tape 5 so that the magnetic tape 5 flies parallel to the magnetic head 1.

Therefore, vibration of the magnetic tape due to the discharged air does not occur, and stress and damage to the magnetic tape and uneven wear of the magnetic head can be eliminated.

〔Example〕

3A and 3B are diagrams illustrating the embodiment, in which FIG. 3A is a perspective view of a magnetic head, and FIG. 3B is a front view of the magnetic head illustrating a state of discharged air.

In the magnetic head of this embodiment, the height of the convex portion of the portion located at the air discharge port 2 of the guide 10a provided on the magnetic head 1 is increased, and the height is reduced as the distance from the air discharge port 2 increases. .

By providing the guide 10a having such a shape, the discharge air 8 discharged from the air discharge port 2 flows along the tape running direction, and at the same time, as the height of the protrusion of the guide 10a decreases, the discharge air 8 gradually decreases. Then, the magnetic tape flows out from the side of the magnetic tape, and the floating state of the magnetic tape is very stable.

〔The invention's effect〕

As described above, according to the present invention, the air discharged from the air discharge port provided on the magnetic tape sliding contact surface of the magnetic head flows in the length direction of the magnetic tape, and the floating state of the magnetic tape is stabilized. The vibration of the magnetic tape does not occur.

Therefore, the stress and damage of the magnetic tape and the uneven wear of the magnetic head are eliminated, the life of the magnetic tape and the magnetic head is greatly extended, and the reliability of the magnetic tape device can be remarkably improved.

[Brief description of the drawings]

FIG. 1 is a perspective view illustrating the basic principle of the present invention, FIG. 2 is a diagram illustrating the operation of a magnetic head according to the present invention, (a) is a front view of the magnetic head, and (b) is a magnetic head. FIG. 3 is a view for explaining the embodiment, FIG. 3 (a) is a perspective view of a magnetic head, FIG. 3 (b) is a front view of the magnetic head for explaining a state of discharged air, and FIG. FIG. 5 is a perspective view illustrating a magnetic head and a tape traveling system around the magnetic head. FIG. 5 is a diagram illustrating a floating state of a magnetic tape.
(A) is a front view of a magnetic head, (b) is AA of (a).
Sectional view, (c) is a BB side view of (a), FIG. 6 is a side view illustrating a vibration state (1) of the magnetic tape, and FIG. 7 is a vibration state (2) of the magnetic tape. It is a side view explaining. In the figure, 1 is a magnetic head, 2 is an air outlet, 3 is an air supply pipe, 4 is air to be sent out, 5 is a magnetic tape,
Reference numeral 6 denotes a tape guide, 7 denotes a tape running direction, 8 denotes discharge air, 9 denotes a contact portion, 10 and 10a denote guides, and 11 denotes a magnetic tape sliding contact surface.

Claims (1)

(57) [Claims] 1. A magnetic tape sliding contact surface (1) of a magnetic head (1).
Air is discharged from the air discharge port (2) provided in 1),
In a magnetic head of a magnetic tape device for floating a magnetic tape, protrusions are formed at both sides of the magnetic tape at a position of an air discharge port (2) of the magnetic tape sliding contact surface (11) at an interval equivalent to the width of the magnetic tape. A magnetic head for a magnetic tape device, wherein a magnetic tape runs in the projection.