JPH0366018A - Magnetic head - Google Patents

Abstract

PURPOSE:To prevent a damage of a magnetic tape without increasing the curvature of a tape slide face by providing a tilt face to a region of a core moving in precedence over the rotating direction of a cylinder and in first contact with the magnetic tape. CONSTITUTION:A magnetic tape running in opposite direction to a cylinder 13 is in first contact with a tilt face 15 of a core 3 by the rotation of the cylinder 13 and led to a tape slide face 4 quickly along the tilt face 15. Then the magnetic tape is slides on a slide face 4 of a head chip 1 and recording or reproduction is implemented through a gap 10. Since the magnetic tape is led to the slide face 4 along the tilt face 15 in this way, a damage to the magnetic tape due to a corner 14 is avoided and it is not required to increase the curvature of the slide face 4 to prevent the corner 14 from being in contact with the magnetic tape.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a magnetic head used in devices that perform high-density magnetic recording and reproduction, such as video tape recorders.

[Conventional technology]

Conventionally, in magnetic recording and reproducing devices such as video tape recorders, efforts have been made to improve the magnetic properties of magnetic heads in order to perform high-density recording and reproduction, and the quality of recording and reproduction is improving year by year. . In addition, in devices equipped with rotating cylinders such as video tape recorders, the contact between the magnetic tape and the magnetic head attached to the cylinder has a large effect on the recording and playback characteristics, so it is important to ensure that the contact is good. Development is also underway.

A magnetic head used for such high-density magnetic recording and reproducing is manufactured, for example, by the method shown below.

First, as shown in FIG. 3(a), internal winding grooves 23, external winding grooves 24, track grooves 25, etc. are formed in a block 21 made of magnetic material, and as shown in FIG. 3(b), As shown, an external winding groove 24, a reinforcing groove 26, a track groove 25, etc. are formed in a block 22 made of a magnetic material like the block 21. Next, the track groove 25...
is filled with the glass filler 27 shown in FIG.
A head block 29 as shown in FIG. 3(C) is formed by mirror-polishing the head block 8 and bonding the gap facing surfaces 28 and 28 together. Then, after grinding the tape sliding surface 30 of the head block 29 at a constant curvature, the head block 29 is cut along the two-dot chain line in the figure to produce a head chip as shown in FIG. 3(d). 31 is obtained.

Further, as shown in FIG. 3(e), this head chip 31 is adhered and fixed to the head base 32, and the tape sliding surface 30 is mirror-polished with a polishing tape or the like, and then the core 21'
・Inner winding groove 23 and outer winding groove 24 around 22'
Winding wires 33 and 33 are wound along.

When the magnetic head manufactured as described above is mounted on a magnetic recording/reproducing device such as a video tape recorder or a DAT, the magnetic head has a tape sliding surface 30 attached to a magnetic tape (not shown) as shown in FIG. In order to make appropriate contact with the rotary cylinder 34, the head chip 31 disposed in the window 34a is fixed to the rotary cylinder 34 so as to protrude from the outer peripheral surface of the cylinder 34 by a predetermined amount. The width Dt of the window 34a in the rotational direction of the cylinder 34 is set in accordance with the chip width d2 of the head chip 31 to prevent the magnetic tape from entering the gap 35 formed between the window 34a and the head chip 31 and being damaged. It is set.

By the way, in order to improve the recording and reproducing characteristics of the magnetic head attached to the cylinder 34 in this way, it is necessary to improve the magnetic characteristics, and for this purpose, it is effective to miniaturize the head chip 31. has been known for a long time. Therefore, in the process of manufacturing the magnetic head, the width of the blocks 21 and 22 in the direction perpendicular to the gap facing surfaces 28 and 28 is narrowed to obtain a chip width d2 as shown in FIG.
The easiest way to reduce the size of the hent tip 31 is to reduce the size of the hent tip 31.

[Problem to be solved by the invention]

However, although the magnetic head manufactured by the method described above can easily realize a miniaturization of the head chip 31, by reducing the chip width d2, the corner part 36 of the core 22' becomes closer to the cylinder 34. It sticks out from the outside.

When the cylinder 34 rotates in this state, the magnetic tape comes into contact with the surface of the corner 36 that is parallel to the gap facing surface 28, which impedes the running of the magnetic tape and also damages the magnetic tape. arise.

Therefore, in order to solve the above problem, it is possible to reduce the amount of protrusion of the corner portion 36 by increasing the curvature of the tape sliding surface 30.
There was a problem in that the magnetic tape came into strong contact with the center of the magnetic head, reducing the wear resistance of the magnetic head.

Incidentally, in recent years, where a wide variety of magnetic heads have been developed depending on the application, different magnetic heads are often installed depending on the model. Therefore, in order to attach the magnetic head to the window 34a of the cylinder 34, the chip width d of the head chip 31 is required! A dedicated cylinder 34 having a window portion 34a of a size corresponding to the size was required. Additionally, this requires different processing depending on the magnetic head attached to the cylinder 34, resulting in a problem that the cost of the cylinder 34 increases.

[Means to solve the problem]

In order to solve the above-mentioned problems, a magnetic head according to the present invention has a head chip that is attached to a rotary cylinder and formed by joining a plurality of cores, and that the head chip is separated from the outer peripheral surface of the cylinder. In a magnetic head that is arranged to protrude a certain amount, a gap is provided in the area where the core, which moves ahead in the direction of rotation of the cylinder, first comes into contact with the magnetic tape, so as to guide the magnetic tape to the tape sliding surface of the head chip. It is characterized by being provided with an inclined surface that is inclined with respect to the opposing surface.

[For production]

According to the above configuration, since the core that moves in advance in the direction of rotation of the cylinder is provided with an inclined surface in the region that comes into contact with the magnetic tape first, even if the chip width of the head chip is reduced, the magnetic tape is guided along the inclined surface to the tape sliding surface without being disturbed or damaged. In addition, since there is no need to increase the curvature of the tape sliding surface to protect the magnetic tape, the head chip can be made smaller without reducing wear resistance, and the magnetic properties of the magnetic head can be improved. can be easily improved.

Since the inclined surface guides the magnetic tape to the tape sliding surface, even if the gap between the core, which moves ahead in the direction of rotation of the cylinder, and the window of the cylinder becomes somewhat wide, The running of the magnetic tape is not obstructed.

Therefore, it is possible to prevent the magnetic tape from entering the gap to a large extent, and by easing the management of the width of the gap, it is possible to use cylinders in common.

〔Example〕

An embodiment of the present invention will be described below based on FIGS. 1 and 2.

As shown in FIGS. 1(a) and 1(b), a head chip 1 in a magnetic head is made up of two cores 2 and 3 made of magnetic material joined together, and the cores 2 and 3 have a predetermined curvature. A tape sliding surface 4 is formed. The core 2 has an internal winding groove 6 formed on the gap facing surface 5 side and an external winding groove 7 formed on the outside, while the core 3 has a reinforcing groove 8 formed on the gap facing surface 5 side. At the same time, an external winding groove 7 is formed on the outside. Core 2・
3, windings 9 and 9 are installed in the internal winding groove 6 and external winding groove 7.
is wound. Further, a gap 10 is formed between the internal winding groove 6 and the tape sliding surface 4 due to the gap between the gap facing surfaces 5, 5, and both ends of the gap 10 are formed with glass fillers 11, 11. reinforced by. Such a head chip 1 is fixed to a head base 12.

In the magnetic head configured as described above, in the cylinder 13 rotating in the direction of the arrow in the figure, the window portion 1 is arranged so that the head chip l protrudes from the outer peripheral surface of the cylinder 13 by a predetermined amount.
3a, and the whole is fixed to the lower end surface of the cylinder 13. The window portion 13a extends D in the rotational direction of the cylinder 13.
The width is set according to the chip width d of the head chip 1. On the other hand, the head chip 1 is formed so that the chip width d+ is as small as possible in order to improve the magnetic properties of the magnetic head. In addition, in the head chip l, as shown in FIG. 2, the corner portion 14 (indicated by a two-dot chain line in the figure) of the core 2 that first comes into contact with the magnetic tape (not shown) is removed from the cylinder 13 by an abrasive tape or the like. It is ground and removed at an angle that corresponds to the amount of protrusion. As a result, the core 3 is formed with an inclined surface 15 that is inclined with respect to the gap facing surface 5.

In the above configuration, the magnetic tape traveling in the opposite direction to the cylinder 13 first contacts the inclined surface 15 of the core 3 as the cylinder 13 rotates, and immediately moves along the inclined surface 15 to the tape sliding surface 4. be led to. Then, the magnetic tape slides on the tape sliding surface 4 of the head chip 1, and recording or reproduction is performed through the gap 10.

In this way, since the magnetic tape is guided to the tape sliding surface 4 by the inclined surface 15, it is possible to eliminate damage to the magnetic tape caused by the corner 14, and to prevent the corner 14 from coming into contact with the magnetic tape. There is no need to increase the curvature of the sliding surface 4.

In addition, a gap 16 formed between the core 3 and the window portion 13a
Even if the magnetic tape gets into the sloping surface 15, the magnetic tape will easily escape from the inclined surface 15, and even if the gap 16 becomes a little wider, the magnetic tape can be prevented from getting in too much. There is no need to do this. Therefore, even if different magnetic heads are attached to different cylinders 13, the width D+ of the window portion 13a can be made the same, and the cylinders 13 can be used in common.

In addition, in this example, considering ease of processing,
As shown in FIG. 2, the inclined surface 15 is formed in a flat shape, but is not limited to this, and may be formed in a curved shape depending on the amount of protrusion of the corner portion 14.

〔Effect of the invention〕

As described above, the magnetic head according to the present invention is attached to a rotary cylinder and has a head chip formed by joining a plurality of cores, and the head chip is configured to protrude by a predetermined amount from the outer peripheral surface of the cylinder. In a magnetic head disposed in the cylinder, a gap is placed in the region of the core that first contacts the magnetic tape, which moves ahead in the direction of rotation of the cylinder, against the gap facing surface so as to guide the magnetic tape to the tape sliding surface of the head chip. This is a configuration in which an inclined surface is provided.

This allows the magnetic tape to be guided along the slope to the tape sliding surface, so even if the chip width of the head chip is reduced, the running of the magnetic tape will not be disturbed or the magnetic tape will be damaged. .

Furthermore, there is no need to increase the curvature of the tape sliding surface to protect the magnetic tape, and the wear resistance of the magnetic head does not deteriorate. Therefore, the head chip can be easily miniaturized and the magnetic characteristics of the magnetic head can be improved.

In addition, a core that moves in advance in the rotational direction of the cylinder,
Even if the gap between the cylinder and the window becomes somewhat wide, the inclined surface can prevent the magnetic tape from entering the gap to a large extent, and there is no need to set the width of the gap strictly. Therefore, it is possible to use common cylinders and easily reduce the cost of the cylinders.

[Brief explanation of drawings]

1 and 2 show one embodiment of the present invention. FIG. 1(a) is a front view showing a state in which the magnetic head is attached to a cylinder. FIG. 1(b) is a bottom view showing the magnetic head attached to the cylinder. Fig. 2 is a portion of Fig. 1 (b) showing the corner of the core. Fig. 3 (a) 1 Fig. 1! +1 (b) Fig. 3 (c) 6 Fig. (e) No.: IJ (d) Fig.

Claims (1)

[Claims] 1. The head chip is attached to a rotary cylinder and is formed by joining a plurality of cores, and the head chip is arranged so as to protrude by a predetermined amount from the outer peripheral surface of the cylinder. In a magnetic head, a core that moves ahead in the rotational direction of the cylinder has an inclined surface that is inclined with respect to the gap facing surface in a region that first contacts the magnetic tape so as to guide the magnetic tape to the tape sliding surface of the head chip. A magnetic head characterized by being provided with a magnetic head.