JPH1125417A - Magnetic head - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the output of a magnetic head, to reduce sliding noise and to manufacture the head at a lower cost by constituting of cores, which make up a head chip, using a single crystal kind and setting different crystal kinds to form the cores which are facing to each other through a magnetic gap. SOLUTION: A head chip 10A has cores 1a and 1b to which coils 3 are wound. The cores 1a and 1b are facing to each other through a magnetic gap 2 and a magnetic tape 20 slides over the top surfaces of the cores 1a and 1b in the direction of the arrow shown in the caption. The core 1a, against which the tape 20 first contacts, is constituted of poly crystalline ferrite P. The core 1b, from which the tape 20 leaves, is constituted of a single crystal ferrite S. Note that there exists no joint surface of ferrite S and ferrite P in the cores 1a and 1b. Thus, the magnetic head is produced at a lower cost than the conventional magnetic head having a joint ferrite, sliding noise is effectively suppressed and the output becomes larger.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic head in which a core constituting a head chip is formed of magnetic materials having different types of crystals to reduce sliding noise and increase output.

[0002]

2. Description of the Related Art A magnetic head used for recording and reproducing a magnetic tape such as a video tape recorder (VTR) generally has
It consists of a head chip and a head base that supports it. As shown in FIG. 7, this head chip 10x
A pair of cores 1 made of a magnetic material such as single crystal ferrite S
(1a, 1b) are opposed to each other via a magnetic gap 2, and a coil 3 is wound therearound. In the figure, the upper surface of each core 1a, 1b is the tape sliding surface 4. In addition, a track width regulating groove 5 filled with fused glass is formed on the abutting surfaces of the cores 1a and 1b.

Conventionally, when a single crystal ferrite S is used as a magnetic material constituting the core 1 of the head chip 10x as shown in FIG. 7, a high output can be obtained but sliding noise is large, and It is known that when polycrystalline ferrite is used, sliding noise can be reduced, but output is reduced. Therefore, in order to take advantage of the respective characteristics of the single crystal ferrite and the polycrystal ferrite, for example, the head chip 10y shown in FIG.
The cores 1a and 1b are made of a joining ferrite of a single crystal ferrite S and a polycrystal ferrite P, and the tape sliding surface 4 is made of a single crystal ferrite S. Is known to be included. Moreover, the two opposing faces via the magnetic gap 2
It is also known to use a joint ferrite of a single crystal ferrite and a polycrystal ferrite as described above for only one of the cores.

[0004]

However, a conventional head chip using a joint ferrite of a single crystal ferrite and a polycrystal ferrite has a single crystal ferrite and a polycrystal ferrite which are opposed to each other through a magnetic gap. Therefore, there is a problem that the manufacturing cost is increased because a joint portion must be provided.

The present invention has been made to solve the above-mentioned problems of the prior art, and the output of a magnetic head is improved by forming a core of a head chip from magnetic materials having different types of crystals. Another object of the present invention is to reduce the sliding noise and to obtain such a magnetic head at a low cost.

[0006]

Means for Solving the Problems The present inventors have proposed that each core itself constituting a head chip is composed of a single crystal seed, and the type of crystal of the cores which are opposed to each other via a magnetic gap. It has been found that the above-mentioned object can be achieved by changing the above, and the present invention has been completed.

That is, according to the present invention, in a magnetic head in which a head chip having two cores facing each other via a magnetic gap is attached to a head base, the two cores facing each other have different types of crystals. Provided is a magnetic head comprising a magnetic material.

According to the magnetic head of the present invention, for example, one of two cores facing each other via a magnetic gap can be formed of a single crystal and the other can be formed of a polycrystal, which is particularly preferable. As an embodiment, of the two cores facing each other via the magnetic gap, the core that first comes into contact with the sliding magnetic tape is made of polycrystalline ferrite, and the core on the side from which the magnetic tape separates is the core. It can be composed of single crystal ferrite.

As described above, the magnetic head in which the core made of single-crystal ferrite and the core made of polycrystalline ferrite are opposed to each other is a conventional magnetic head in which both opposed cores are made of only single-crystal ferrite. Sliding noise can be reduced as compared with
The output can be improved compared to the conventional magnetic head in which both cores are composed of only polycrystalline ferrite.
Further, the material cost can be reduced as compared with a conventional magnetic head using a joint ferrite of a single crystal ferrite and a polycrystal ferrite for each core.

Further, the present invention can also be configured as a magnetic head in which two head chips are mounted adjacent to a head base. In this case, the outer cores of the two adjacent head chips are increased in number. When it is made of crystalline ferrite, sliding noise can be reduced more effectively.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to the drawings. In each of the drawings, the same reference numerals represent the same or equivalent components.

FIG. 1 is a perspective view of a head chip 10A used in a magnetic head of the present invention for a VTR in which a head chip is attached to a head base such that one head chip corresponds to one drum window. is there.

This head chip 10A has two cores 1a and 1b facing each other via a magnetic gap 2 like the conventional head chip 10x shown in FIG.
a and 1b, a coil 3 is wound. Of these two cores 1a and 1b, the core 1a that first contacts the magnetic tape 20 that slides in the direction of the arrow is the polycrystalline ferrite P. The core 1b on the side from which the magnetic tape 20 is separated is made of single crystal ferrite S, and each core 1a, 1b has no joint surface between the single crystal ferrite S and the polycrystal ferrite P. And

As described above, in the magnetic head in which the head chip is attached to the head base such that one head chip corresponds to one drum window, the magnetic head 20 comes into contact with the sliding magnetic tape 20 first. Sliding noise can be effectively suppressed by forming the core 1a on the side from polycrystalline ferrite P, and furthermore, by forming the core 1b on the side from which the magnetic tape 20 separates from single crystal ferrite. High output can be obtained.
Further, since each of the cores 1a and 1b does not have a bonding surface between the single crystal ferrite S and the polycrystal ferrite P, the core 1a and 1b can be manufactured at lower cost than a magnetic head using a conventional single crystal ferrite and polycrystal ferrite. It becomes possible.

In the present invention, the core 1a on the side that first comes into contact with the sliding magnetic tape 20 can be a single crystal ferrite S, and the core 1b on the side away from the magnetic tape 20 can be a polycrystalline ferrite P. Thereby, the sliding noise can be suppressed as compared with the conventional magnetic head (see FIG. 7) in which the two cores 1a and 1b facing each other via the magnetic gap 2 are formed only of the single crystal ferrite S,
Further, a higher output can be obtained than in the conventional magnetic head in which the two opposing cores are formed only of the polycrystalline ferrite P. However, as described above, the core 1a on the first contact side is made of polycrystalline ferrite P, and the core 1b on the side from which the magnetic tape 20 is separated is made of single crystal ferrite, so that the output can be more effectively achieved. This is preferable because it can increase the sliding noise and suppress the sliding noise.

In the magnetic head of the present invention, there is no particular limitation on the head base to which the head chip 10A of FIG. 1 is attached, and a known head base to which the conventional head chip 10x of FIG. 7 is attached can be used.

FIG. 2 is a schematic plan view of the head chips 10B and 10C of a magnetic head according to another embodiment of the present invention.
This magnetic head is designed so that two head chips correspond to one drum window of the rotary drum on which the head base 30 is mounted, from the viewpoint of wear resistance and contact with the magnetic tape, or from the viewpoint of assembly workability. , Two head chips 10B and 10C are attached to the head base 30 adjacent to each other, and the two head chips 10B and 10C in this case are two cores facing each other via the magnetic gap 2. (1a _B , 1b _B ), (1a _B
C , 1b _C ) tape sliding surface (4a _B , 4b _B ), (4
a _C , 4b _C ).

Here, in the embodiment of FIG. 2, opposing inner cores 1b _B , 1b _{C of the} two head chips 10B, 10C.
Is composed of single crystal ferrite S, and two head chips 1
The cores 1a _B and 1a _C outside the cores 0B and 10C are made of polycrystalline ferrite P. This makes it possible to effectively increase the output and reduce the sliding noise.

FIG. 3 is a schematic plan view of the head chips 10D and 10E of a magnetic head according to another embodiment of the present invention. This magnetic head is also designed such that two head chips correspond to one drum window of the rotary drum on which the head base 30 is mounted, from the viewpoint of wear resistance and contact with the magnetic tape or from the viewpoint of assembly workability. , Two head chips 10D and 10E are mounted adjacent to each other on a head base 30. However, unlike the above-described embodiment of FIG. 2, in the embodiment of FIG. 3, as shown in FIG. 4, two cores 1c and 1d opposed to each other via the magnetic gap 2 as two head chips 10D and 10E. Are different from each other in size and shape, and one core 1c is formed such that the area of the tape sliding surface 4 is extremely small with respect to the other core 1d. Then, in the two head chips 10D and 10E of FIG. 3, the smaller cores 1c of the tape sliding surfaces 4 face each other, that is, the smaller cores 1c of the tape sliding surfaces 4 are located inside,
The tape is mounted adjacent to the head base 30 such that the larger core 1d of the tape sliding surface 4 is on the outside.

In the magnetic head in which the head chips 10D and 10E having different sizes of the cores 1c and 1d are adjacent to each other, in the embodiment of FIG. 3, the smaller the area of the inner tape sliding surface 4 is, Is characterized in that the core 1c is made of single crystal ferrite S, and the outer core 1d of the tape sliding surface 4 having the larger area is made of polycrystalline ferrite P. This effectively reduces the sliding noise.

FIG. 5 is also a schematic plan view of the head chips 10F and 10G of the magnetic head of the present invention. The magnetic head shown in FIG. 5 is similar to the magnetic head shown in FIG.
The head chips 10F and 10G having different sizes of d are adjacent to the head base 30, but the inner core 1c having the smaller area of the tape sliding surface 4 is made of polycrystalline ferrite P, and The core 1d having the larger area of the tape sliding surface 4 is made of single crystal ferrite S.

When the use portions of the single crystal ferrite S and the polycrystal ferrite P are reversed from the embodiment of FIG. 3, the degree of suppression of the sliding noise is lower than that of the embodiment of FIG.
High output can be obtained.

As can be seen from the embodiments of FIGS. 3 and 5, in the present invention, when changing the type of crystal of the two cores facing each other via the magnetic gap, the way of combining the types of crystal is as follows. It can be appropriately determined according to the required performance of the magnetic head.

FIG. 6 is a schematic plan view of the head chips 10F and 10G of the magnetic head according to the present invention. The magnetic head of FIG. 6 has a core 1c, like the magnetic head of FIG.
The head chips 10F and 10G having different sizes 1d are adjacent to the head base 30. When the head chips 10F and 10G are adjacent to each other, the core 1d having the larger area of the tape sliding surface 4 is placed inside the core 1d. And the smaller core 1c is on the outside. The outer core 1c is made of polycrystalline ferrite P, and the inner core 1d is made of single crystal ferrite S.

In the embodiment of FIG. 6, the degree of suppression of the sliding noise is lower than that of the embodiment of FIG. 3, but a high output can be obtained.

As described above, the embodiments of the present invention have been described with reference to the drawings. However, the present invention is not limited to these embodiments, and can take various embodiments. For example, in the above example, 1
Although one or two head chips are shown, the configuration of the present invention is also applied to a magnetic head to which three or more head chips are mounted, and the type of the core facing each head chip is changed. Thereby, sliding noise can be suppressed at low cost and output can be improved.

[0027]

According to the present invention, the core of the head chip is composed of magnetic materials having different types of crystals, thereby improving the output of the magnetic head and reducing the sliding noise. It is possible to obtain in.

[Brief description of the drawings]

FIG. 1 is a perspective view of a head chip used for a magnetic head of the present invention.

FIG. 2 is a schematic plan view of a head chip portion of the magnetic head of the present invention.

FIG. 3 is a schematic plan view of a head chip portion of the magnetic head of the present invention.

FIG. 4 is a perspective view of a head chip used for the magnetic head of the present invention.

FIG. 5 is a schematic plan view of a head chip portion of the magnetic head of the present invention.

FIG. 6 is a schematic plan view of a head chip portion of the magnetic head of the present invention.

FIG. 7 is a perspective view of a head chip used for a conventional magnetic head.

FIG. 8 is a perspective view of a head chip used for a conventional magnetic head.

[Explanation of symbols]

1, 1a, 1b, 1c, 1d: core, 2: magnetic gap, 3: coil, 4: tape sliding surface, 1
0A, 10B, 10C, 10D, 10E, 10F, 10
G: head chip, 20: magnetic tape, 30 ...
Head base

Claims (7)

[Claims] In a magnetic head in which a head chip having two cores facing each other via a magnetic gap is attached to a head base, the two cores facing each other are made of magnetic materials having different crystal types. A magnetic head, characterized in that: 2. The magnetic head according to claim 1, wherein one of the two cores facing each other via the magnetic gap is made of a polycrystal, and the other is made of a single crystal. 3. The two cores facing each other via a magnetic gap, the core on the side that first contacts the sliding magnetic tape is made of polycrystalline ferrite, and the core on the side where the magnetic tape separates. 2. The magnetic head according to claim 1, wherein the magnetic head comprises a single crystal ferrite. 4. When two head chips are attached to a head base adjacent to each other, and the tape sliding surfaces of two cores facing each other via a magnetic gap in each head chip are equal in area, 2. The magnetic head according to claim 1, wherein the cores on opposite sides of the two head chips are made of single crystal ferrite, and the outer cores of the two head chips are made of polycrystalline ferrite. 5. A head base has two head chips mounted adjacent to each other, and in each head chip, the area of the tape sliding surface of one of the two magnetic cores facing each other via a magnetic gap is reduced. When the core having the smaller area of the tape sliding surface of the two adjacent head chips is smaller than the area of the tape sliding surface of the other magnetic material, and the core having the smaller area of the tape sliding surface of the two adjacent head chips is opposed to each other. 2. The magnetic head according to claim 1, wherein the core having a smaller area is made of single crystal ferrite, and the core having a larger tape sliding surface is made of polycrystalline ferrite. 6. A head base has two head chips mounted adjacent to each other, and in each head chip, the area of the tape sliding surface of one of the two cores facing each other via a magnetic gap is the other. When the core having the smaller area of the tape sliding surface of the two adjacent head chips is opposed to the smaller area of the tape sliding surface of the core, the area of the tape sliding surface is smaller. 2. The magnetic head according to claim 1, wherein the smaller core is made of polycrystalline ferrite, and the core having a larger tape sliding surface area is made of single crystal ferrite. 7. A head base has two head chips mounted adjacent to each other, and in each head chip, the area of the tape sliding surface of one of the two cores facing each other via the magnetic gap is the other. When the core having the smaller area of the tape sliding surface of the core and the larger area of the tape sliding surface of the two adjacent head chips is opposed to each other, the area of the tape sliding surface is smaller. 2. The magnetic head according to claim 1, wherein the smaller core is made of polycrystalline ferrite, and the core having a larger tape sliding surface area is made of single crystal ferrite.