JPH0612617A - Magnetic head and its production - Google Patents

Abstract

PURPOSE:To easily position both magnetic gaps with high accuracy in the magnetic head integrally having respective magnetic gaps for recording and reproducing and for servo tracking. CONSTITUTION:This magnetic head has a first core chip 16 forming the first magnetic gap Gc on it for recording and reproducing and a second core chip 17 forming the second magnetic gap Gd on it for servo tracking existing in parallel with the first magnetic gap Gc and apart therefrom along a medium- sliding direction. The process for production consists in slicing a first core block to form the first core chip 16 provided with the first magnetic gap Gc perpendicular to the joint surface and slicing a second core block formed of a thin core base material and a thick core base material to form the second core chip 17 provided with the second magnetic gap Gd perpendicular to the joint surface. The first and second magnetic gaps Gc, Gd are positioned by forming the end faces of the first and second core ships flush with each other.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic head and a method for manufacturing the same, and more particularly to a magnetic head for an FDD (floppy disk drive) device having a magnetic gap for recording / reproducing and servo tracking and a method for manufacturing the same. It is about.

[0002]

2. Description of the Related Art A magnetic head for use in an FDD device such as a personal computer for high density recording having a first magnetic gap for recording / reproducing and a second magnetic gap for servo tracking is shown in FIGS. Then, it will be described next. The magnetic head (1), as shown in FIGS.
A first core chip (2) in which a pair of magnetic cores are joined and integrated to provide a recording / reproducing first magnetic gap (Ga) on the medium sliding top end surface, and a pair of magnetic cores are joined and integrated to form a medium sliding top end surface. And a second core chip (4) provided with a second magnetic gap (Gb) for servo tracking.
The first and second core chips (2) are sandwiched by the first slider portion (3) having the air groove (3a) on the medium sliding surface.
(4) is joined and integrated, and the joined first and second core chips (2) and (4) are further sandwiched and joined by a pair of second slider portions (5) and (5). Here, the second magnetic gap (Gb) is non-parallel (azimuth angle δ) to the first magnetic gap (Ga), and the slider portion thickness maintains a predetermined distance (La) in the Y direction, and
It is formed in a state in which the center of the second magnetic gap (Gb) is located in the extension direction of the first magnetic gap (Ga) and is relatively positioned in the vertical and horizontal directions (XY directions) in the respective planes in the X direction.

According to the above construction, a head positioning servo signal of a deep layer having a track width of about 500 μm is written in advance on a floppy disk, which is a magnetic recording medium, and the servo signal is read by the second magnetic gap (Gb) on the medium. While positioning the head with the first magnetic head (G
According to a), the data signal is recorded or reproduced on a predetermined track. At this time, as described above and as shown in FIG. 3B, the second magnetic gap (Gb) is replaced by the first magnetic gap (Gb).
Since the second magnetic gap (Gb) is erroneously read out the data signal because it is positioned non-parallel with the azimuth angle (δ) with respect to a), conversely, the first magnetic gap (Ga) is erroneously read. It is possible to prevent noise from occurring without reading the servo signal. The so-called gap azimuth loss during reproduction is positively used to prevent crosstalk.

Next, when manufacturing the above magnetic head (1), as shown in FIG. 5, a pair of core base materials (7) and (8) having winding windows (10a) are made into resin or glass (9). ) Or the like to fuse and integrate them to form the first core block (10) for the read / write magnetic gap. Similarly, a pair of core base materials (11) and (12) having a winding window (14a) are welded and integrated by resin or glass (13),
A second core block (14) for the servo tracking magnetic gap is formed. Then, the first core block (1
0) is sliced at a constant pitch perpendicular to the joint surface (Pa) along the chain line in the figure, and the second core block (14) is similarly sliced along the chain line in the figure at a constant angle (90) with respect to the joint surface (Pb). -Δ) and slice diagonally at a constant pitch,
First and second core chips (2) and (4) are formed, respectively. Therefore, for example, as shown in FIG. 4B, the first slider portion (3) is sandwiched by the rectangular parallelepiped first core chip (2) and the substantially diamond-shaped second core chip (4) after slicing. End face (Fa) (Fb) for positioning wall plate (15)
Elastically abutting on the slider, and positioning is performed in the X direction so that the center of the second magnetic gap (Gb) is located in the Y direction by the thickness of the slider portion and in the extension direction of the first magnetic gap (Ga). And the first slider portion (3)
With the first and second magnetic gaps (Ga) and (Gb) positioned with respect to each other, the first and second core chips (2)
(4) is joined and integrated. Further, the second slider part (5)
In (5), the end faces (Fa) and (Fb) of the first and second core chips (2) and (4) are ground and flattened while being joined and integrated into a predetermined structure.

[0005]

The problem to be solved is to position the end face (Fb) of the sliced second core chip (4) when positioning the first and second magnetic gaps (Ga) (Gb). When it is elastically brought into contact with the positioning wall plate (15), its end face (Fb) becomes a rhombic acute angle portion,
Moreover, since it is made of ferrite, it is easily chipped, and it is difficult to perform highly accurate positioning particularly in the range of several μm in the X direction. Even if the acute angle portion is tried to be removed in advance, it cannot be completely removed, and it is still difficult to perform highly accurate positioning. or,
After the head is manufactured, the end faces (Fa) and (Fb) of the first and second core chips (2) and (4) need to be ground and flattened.
Extra man-hours increase.

[0006]

The present invention provides a magnetic head, a first core chip in which a pair of magnetic cores are joined and integrated to form a first magnetic gap for recording and reproduction on a top end surface for medium sliding, and a pair of magnetic cores. A core is joined and integrated to form a second magnetic gap for servo tracking, which is parallel to the first magnetic gap and is spaced a predetermined distance along the medium sliding direction on the top end surface for medium sliding. A first slider part having an air groove on a medium sliding surface is sandwiched and integrated with the first core chip, and a second core chip is sandwiched and integrated with the first and second core chips. A slider portion is provided, and the parallel separation distance between the first and second magnetic gaps is greater than 0 mm and less than 3 mm.

As a method of manufacturing the same, the first and
After the second core base materials are butted and joined together to form the first core block, the first core block is sliced at a constant pitch along the lateral direction and perpendicularly to the joining surface, and the first magnetic field for recording and reproducing is formed on the top end surface. After the step of forming the first core chip provided with the gap and the thin third core base material and the thick fourth core base material are butted and joined together to form the second core block, the second core block is formed. To form a second core chip having a second magnetic gap for servo tracking on the top end face by slicing at a constant pitch and perpendicularly to the joining face, and inserting a slider portion having an air groove on the medium sliding face. Only, the step of joining and integrating the first and second core chips with the first and second magnetic gaps positioned parallel to each other and separated by a predetermined distance in the medium sliding direction, and the joining first , A pair of second core chips Characterized in that it comprises a step of integrally bonding by sandwiching at the slider unit.

[0008]

According to the above technical means, in an FDD magnetic head integrally having a first magnetic gap for recording / reproducing and a second magnetic gap for servo tracking, both gaps are parallel to each other and along the sliding direction of the medium. In a step of sandwiching and integrating the first slider portion with a predetermined distance between them, the respective end surfaces of the first and second core chips forming the magnetic gaps are both held parallel to the magnetic gap and flattened. The respective magnetic end faces can be brought into contact with the positioning wall plate to position both magnetic gaps in the XY directions. In addition, the first on the floppy disk as a recording medium
The direction of the magnetic gap always passes through the center of the medium, while the direction of the second magnetic gap always shifts away from the center of the medium, and as a result, an azimuth angle is generated between the on-track recording direction and both the data signal and servo signal gaps.

[0009]

Embodiments of a magnetic head and a method of manufacturing the same according to the present invention will be described below with reference to FIGS. First, in FIGS. 1A and 1B, (16) and (17) are first and second core chips, and (18), (19), and (19) are first and second core chips.
It is a slider part. The first and second core chips (16)
(17) is formed by joining and integrating a pair of magnetic cores, respectively, and the first and second magnetic gaps (Gc) (Gd) for recording / reproducing and servo tracking are formed on the top end surface for medium sliding.
And the air groove (18
The first slider portion (18) having a) is sandwiched and joined and integrated. The first and second magnetic gaps (Gc) (Gd)
Are parallel to each other, and a predetermined distance (Lo) (for example, 0 in the Y direction due to the slider portion thickness and in the X direction (medium sliding direction)).
(range larger than mm and smaller than 3 mm), and are positioned separately. Then, the first and second joints are integrated.
The core chip (16) (17) is attached to the second slider part (19).
(19) The magnetic head (2
0) is formed.

When manufacturing the above magnetic head (20), first, as shown in FIG. 2, first and second core base materials (21) () having substantially equal thickness (Lc) having a winding window (23a). Two
2) is integrally joined by glass welding or the like to form the first core block (23). Similarly, a thin (thickness Ld) third core base material (24) and a thick fourth core base material (25) having a winding window (26a) are joined and integrated by glass welding or the like. Two core blocks (26) are formed. And
Each of the first and second core blocks (23) and (26) has a constant pitch along the lateral direction and a joint surface (Pc).
Slice perpendicularly to (Pd) to obtain first and second core chips (16) and (17). Therefore, the end faces (Fc) (Fd) of the first and second core chips (16) (17) are held parallel to the magnetic gaps (Gc) (Gd), and in that state, FIG. As shown in, the first slider portion (18) is sandwiched by the first and second core chips (16) and (17), and the end faces (Fc) (Fd) are elastically attached to the positioning wall plate (27). Abut. Then, since the end faces (Fc) (Fd) are flat, the magnetic gaps (Gc) (Gd) can be easily moved by a predetermined distance (L
It is possible to position with high accuracy with a distance of 0), and in that state, the first and second core chips (16) and (17)
The slider portion (18) is sandwiched and joined and integrated. And
Further, the bonded first and second core chips (16) (1
7) is sandwiched by the second slider portions (19) and (19) to be joined and integrated. At this time, since the end faces (Fc) and (Fd) are both flat, extra man-hours such as grinding and flattening in a later step can be omitted.

The operation of the magnetic head (20) according to the present invention based on the above structure will be described below. First, as shown in FIG. 3A, a head positioning servo signal of a deep layer is written in advance on a floppy disk as a recording medium by the second magnetic gap (Gd), and the servo signal is read by the second magnetic gap (Gd). The data signal is written by the first magnetic gap (Gc) while the head is positioned by the head. Then, the extension line of the data signal always passes through the medium center (O) in the radial direction and is located on the radius, while the second line
The magnetic gap (Gd) is located at a predetermined distance from the first magnetic gap (Gc) along the medium sliding direction. Therefore, the extension direction of the servo signal is the center of the medium (O).
It does not pass through, and is always inclined by an angle (θ) with respect to the radial direction, and the servo signal is written while being inclined by a predetermined angle (θ) with respect to the data signal. (In this case, since the angle (θ) is determined by the arctangent of the servo track radius (R) and the constant displacement distance (Lo), the angle (θ) also changes every time the radius (R) changes, and the servo track Therefore, the second magnetic gap (Gd) may erroneously read the data signal, or conversely, the first magnetic gap (Gc) may cause servo error, as in the case where the azimuth angle is provided. There is no longer any need to read signals.

[0012]

According to the present invention, in the magnetic head for FDD which integrally has the first magnetic gap for recording / reproducing and the second magnetic gap for servo tracking, the second magnetic gap is parallel to the first magnetic gap, In addition, since the magnetic gaps are arranged at a predetermined distance from each other in the medium sliding direction, both magnetic gaps are parallel to each other, which facilitates the positioning and enables highly accurate positioning. Further, since the second magnetic gap is always displaced from the center of the medium by a predetermined distance, the servo signal is always written at a predetermined angle with respect to the center of the medium, and the signal is erroneously read with the first magnetic gap. Does not happen. Further, it is not necessary to flatten the end surface of the core chip after manufacturing the head, and the number of steps is reduced.

[Brief description of drawings]

FIG. 1A is a perspective view showing an embodiment of a magnetic head according to the present invention. (B) is a plan view showing an embodiment of the magnetic head according to the present invention.

FIG. 2 is a perspective view of a core block showing an embodiment of a method of manufacturing a magnetic head according to the present invention.

FIG. 3A is a partial track diagram of a data signal and a servo signal showing an operation of the magnetic head according to the present invention.
(B) is a partial track diagram of a data signal and a servo signal showing the operation of the conventional magnetic head.

FIG. 4A is a perspective view showing an example of a conventional FDD magnetic head. FIG. 7B is a plan view showing an example of a conventional FDD magnetic head.

FIG. 5 is a perspective view of a core block showing an example of a conventional method of manufacturing a magnetic head for FDD.

[Explanation of symbols]

 16 1st core chip 17 2nd core chip 18 1st slider part 18a Air groove 19 2nd slider part Gc 1st magnetic gap Gd 2nd magnetic gap

Claims (3)

[Claims] 1. A first core chip in which a pair of magnetic cores are joined and integrated to form a recording / reproducing first magnetic gap on a medium sliding top end surface and a pair of magnetic cores are joined and integrated to form a medium sliding top end surface. Parallel to the first magnetic gap, and
A second magnetic gap for servo tracking, which is located a predetermined distance apart along the sliding direction of the medium, is formed, and
A second core chip formed by sandwiching a first slider part having an air groove on a medium sliding surface, and joining and integrating the first slider part with the first core chip;
A magnetic head comprising: a pair of second slider portions, which are joined and integrated by sandwiching the joined first and second core chips. 2. The magnetic head according to claim 1, wherein the parallel separation distance between the first and second magnetic gaps is larger than 0 mm and smaller than 3 mm. 3. A first core block is formed by abutting and integrally joining first and second core base materials of approximately equal thickness to each other to form a first core block, and then at a constant pitch along a lateral direction and perpendicularly to a joint surface. The step of slicing to form the first core chip having the first magnetic gap for recording / reproducing on the top end surface, and the thin third core base material and the thick fourth core base material are butted and joined together to form the second Forming a second core chip having a second magnetic gap for servo tracking on the top end face by slicing the core block at a constant pitch along the lateral direction and perpendicularly to the joint surface; With the first slider portion having an air groove on the sliding surface sandwiched between the first and second magnetic gaps with the end faces aligned and parallel to each other and a predetermined distance along the sliding direction of the medium. Step of joining and integrating the first and second core chips 3. The method of manufacturing a magnetic head according to claim 1, further comprising: and a step of sandwiching the bonded first and second core chips by a pair of second slider parts to integrally bond them.