JPH10134478A - Magnetic head - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a magnetic head to be mounted on a recording medium recording and reproducing device having interchangeability between a recording medium to be driven to rotate at about 300r.p.m. and a recording medium to be driven to rotate at >=1200r.p.m. SOLUTION: An information signal is recorded and reproduced by the magnetic head 1 in slide contact between its medium sliding surface 1a having a curved surface formed with a prescribed curvature in its sliding direction and the recording medium. Then, the head possesses a magnetic core 2 for recording and reproducing the recording medium driven to rotate at about 300r.p.m. and a magnetic core 3 for recording and reproducing the recording medium driven to rotate at about 1200r.p.m., and grooves 6a and 6b are formed before and behind magnetic gaps g1, g2 and g3 formed by these magnetic cores 2 and 3 in the sliding direction A.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a magnetic head for recording and reproducing information signals on a magnetic recording medium.

[0002]

2. Description of the Related Art Conventionally, as a magnetic head for performing recording and reproduction on a flexible disk which is a disk-shaped magnetic recording medium, a magnetic head which performs recording and reproduction by sliding the flexible disk with respect to the magnetic head is widely used. Have been. This flexible disk is 300-600 rpm
There is a specification (hereinafter referred to as a lower specification) in which information signals are recorded and reproduced by being rotationally driven at a rotational speed of about m.

[0003] A flexible disk for recording / reproducing with the magnetic head of the lower specification has a recording capacity of about 1.44 megabytes at the time of formatting. Further, as a disk-shaped magnetic recording medium, the recording capacity is 150 to 650.
There is an improved flexible disk with megabytes.

On the other hand, the recording density is made higher than that of the lower specification flexible disk, and
By performing recording and reproduction at about 3600 rpm,
There is a specification (hereinafter, referred to as an upper specification) for improving the recording density and the data transfer rate. Further, the flexible disk used in the upper specification has a storage capacity of 100 megabytes or more by narrowing tracks and the like.

Here, when recording / reproducing an information signal on a lower-level flexible disk, the magnetic head is pressed against the lower-level flexible disk by applying a load by a slider support mechanism. When the lower specification flexible disk is driven to rotate, the slider is pressed against the flexible disk by the slider support mechanism, and the lower specification flexible disk is driven to rotate to apply a floating force due to the airflow. Here, the lower specification flexible disk is
Since the pressure by the slider support mechanism is greater than the flying force, the slider slides with the slider to record and reproduce information signals.

Here, the magnetic head has a medium sliding surface that slides on a flexible disk of lower specification. The medium sliding surface of the magnetic head is formed to be substantially flat so as to be in sliding contact with the lower specification flexible disk.

On the other hand, as a disk-shaped magnetic recording medium, there is a flexible disk of a higher specification. When recording and reproducing information signals, the flexible disk of the upper specification is rotationally driven at a high speed of about 1200 to 3600 rpm in order to improve the recording density and the data transfer rate of the information signals.

As a recording / reproducing method for the flexible disk of the higher specification, a floating type recording / reproducing method in which an information signal is recorded / reproduced while a predetermined interval is provided between the slider and a magnetic head, There is a sliding recording / reproducing method in which recording / reproducing of an information signal is performed while sliding on a magnetic head by sliding.

The slider used in this floating type recording / reproducing system controls the air flow by performing a predetermined processing on the medium facing surface facing the flexible disk, and obtains a desired floating force.

On the other hand, the sliding recording / reproducing system is a system in which the above-mentioned floating force is smaller than the pressing force by the slider support mechanism, and the recording / reproducing of the information signal is performed by sliding on the flexible disk.

The magnetic head used in the sliding recording / reproducing system has a medium sliding surface that slides on a flexible disk. The medium sliding surface is formed to be substantially flat so that it does not float due to the floating force from the flexible disk.

[0012]

By the way, in recent years, a flexible disk drive which records and reproduces data on a flexible disk of a lower specification which is widely used in recent years is desired to have compatibility with a flexible disk of a higher specification. It is rare.

Further, when recording / reproducing the above-mentioned flexible disk with a sliding magnetic head, the rotation speed of the flexible disk has been set to about 300 to 600 rpm. On the other hand, in recent years, it has been desired to increase the number of rotations of a flexible disk in accordance with improvements in recording density, data transfer rate, and the like.

However, the lower specification magnetic head is
When recording / reproducing information signals to / from the upper specification flexible disk, if the rotational speed of the upper specification flexible disk is increased, the magnetic flow of the lower specification is affected by the air flow in the surface layer of the upper specification flexible disk. The flying force applied to the head is greater than the pressure applied by the slider support mechanism, and the head flies greatly. When the flying height increases, the distance between the lower specification magnetic head and the higher specification flexible disk increases to about 0.06 to 0.12 [mu] m, so that good recording / reproducing characteristics cannot be obtained.

[0015] In addition, a floating magnetic head used for a higher specification flexible disk has a magnetic force due to a levitation force generated by rotating the lower specification flexible disk when recording / reproducing the lower specification flexible disk. The head comes up. Therefore, it is impossible to perform recording / reproduction on a flexible disk of a lower specification which is based on the sliding type.

In view of the above-mentioned problems, the present invention provides a high-density, high-grade, flexible disk which is driven at a high speed while recording and reproducing while suppressing the flying height.
It is an object of the present invention to provide a magnetic head capable of recording / reproducing a flexible disk of a higher specification and a flexible disk of a lower specification by enabling recording and reproduction of a higher specification flexible disk in a sliding type.

[0017]

According to the magnetic head of the present invention, which solves the above-mentioned problems, a medium sliding surface having a curved surface formed with a predetermined curvature in a sliding direction comes into sliding contact with a recording medium. In a magnetic head for recording and reproducing information signals,
A groove is formed before and after the sliding direction of the magnetic gap.

In the above magnetic head, grooves are formed before and after the sliding direction of the magnetic gap formed on the medium sliding surface that slides on the recording medium, so that the recording medium is rotated at a high speed to perform recording. Even if the reproduction is performed, the magnetic head does not float greatly. Therefore, the magnetic head can record and reproduce information signals while sliding on a recording medium on which recording and reproduction are performed by rotating the magnetic head at high speed.

The above-mentioned groove is formed, for example, in an arc shape on the medium sliding surface. By forming the grooves formed on the medium sliding surface of the magnetic head in an arc shape in this manner, it is possible to simplify the magnetic head manufacturing process for manufacturing the magnetic head.

In the magnetic head, the medium sliding surface may be formed in a spherical shape. By forming the medium sliding surface in a spherical shape as described above, the levitation force applied to the magnetic head when the recording medium is rotated at a high speed to perform recording and reproduction is reduced, and the flying height of the magnetic head is suppressed. can do.

[0021]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a magnetic head according to the present invention will be described in detail with reference to the drawings. The present invention is not limited to the following examples, and can be arbitrarily changed without departing from the gist of the present invention.

The magnetic head according to the present embodiment is a sliding magnetic head that performs recording and reproduction by sliding a flexible disk that is driven to rotate.

This magnetic head has a rotational speed of 300 r for a 3.5 inch diameter flexible disk.
pm (hereinafter referred to as a lower specification) and a 3.5-inch diameter flexible disk which has a higher recording density than the 3.5-inch flexible disk of the lower specification. On the other hand, the rotation speed is 1
This magnetic head can be used for both specifications (hereinafter, referred to as higher-order specifications) for improving recording density and data transfer rate by performing recording and reproduction at about 200 to 3600 rpm.

A flexible disk that is recorded and reproduced by the magnetic head of the lower specification has a recording capacity at the time of formatting of about 1.44 megabytes. The recording capacity of a flexible disk that is recorded and reproduced by a higher-order magnetic head has been improved to 150 to 650 megabytes. On the other hand, the flexible disk used in the upper specification has a storage capacity of 100 megabytes or more by narrowing the track or the like.

In the lower specification, since recording and reproduction are performed without performing tracking servo, an erasing core is required in addition to a read / write core as described later in order to compensate for a guard band between tracks. However, in the upper specification, a tracking signal is recorded on a flexible disk in order to achieve high-density recording.

As shown in FIGS. 1 and 2, the magnetic head 1 according to the present embodiment includes a lower magnetic core 2 used in a lower specification, an upper magnetic core 3 used in a higher specification, Lower magnetic core 2 and upper magnetic core 3
And a slider 5 in which the lower magnetic core 2, the spacer 4 and the upper magnetic core 3 are bonded and embedded, and the upper surface thereof becomes the medium sliding surface 1 a. . The medium sliding surface 1a has an arc-shaped groove 6a surrounding the magnetic gap g.
6b (hereinafter, collectively referred to as grooves 6) are formed. FIG. 1 is a plan view of the magnetic head 1 according to the present embodiment, and FIG. 2 is a side view of the magnetic head 1 according to the present embodiment.

In the present embodiment, the length t1 of the magnetic head in the sliding direction A is about 3 mm, and the length t2 in the direction perpendicular to the sliding direction A is about 2. 8 mm, and the height dimension t3 is about 2.7.
mm.

In the following description, in the magnetic head according to the present embodiment, the side located on the front side with respect to the rotatably driven flexible disk is simply referred to as the front side. The side located at the rear is simply referred to as the rear side.

As shown in FIGS. 1 and 2, the medium sliding surface 1a has a flexible disk
The surface is in sliding contact with the flexible disk when driven to rotate in the direction. Grooves 6 are formed in the medium sliding surface 1a on the front and rear sides of the upper and lower specification magnetic gaps g1, g2, and g3.

The groove 6 is formed to generate a negative pressure for narrowing a gap between the flexible disk and the magnetic head by an air flow generated by rotating the flexible disk during recording and reproduction. You. The grooves 6 are formed on the front and rear sides of the magnetic gaps g1, g2, g3 in a direction orthogonal to the sliding direction A of the magnetic head, and have a predetermined curvature. Therefore, the magnetic head 1 can perform recording and reproduction while slidingly contacting the flexible disk by rotating the flexible disk during recording and reproduction. In the present embodiment, the depth of the groove 6 is
It is formed to about 0.1 mm.

The lower magnetic core 2 and the upper magnetic core 3 are
They are joined via a spacer 4 made of a non-magnetic material such as glass. The lower magnetic core 2 and the upper magnetic core 3 are configured as a magnetic head 1 by being embedded in a slider 5.

The lower magnetic core 2 is, as shown in FIG.
In this embodiment, a read / write core 7 made of a ferrite material for recording / reproducing information signals and an erase core for maintaining magnetic insulation between tracks of information signals recorded on a flexible disk are provided. It is composed of a core 8. The read / write core 7 and the erase core 8 are fused by glass 9 which is a non-magnetic material, so that magnetic insulation is maintained. In the present embodiment, the lower magnetic core 2 is the same as that shown in FIG.
As shown in the figure, the length t in the direction orthogonal to the sliding direction A
5 is about 0.28 mm, the length t5 in the sliding width direction is about 2.4 mm, and the distance t6 between the magnetic gap g1 of the read / write core 7 and the magnetic gap g2 of the erase core is about 0. It is formed as 4 mm.

The read / write core 7 is for reproducing an information signal recorded on a lower-level flexible disk and recording an information signal on a lower-level flexible disk. A substantially L-shaped magnetic core half 11 disposed on the front side and a substantially I-shaped magnetic core half 12 disposed on the rear side such that the concave portion 10 is formed on the opposite side of the moving surface 1a. Are joined by the glass 13. Here, the magnetic core halves 11 and 12 are made of a magnetic material having excellent soft magnetic properties such as ferrite. The magnetic gap g1 is formed from the medium sliding surface 1a to the glass 13, and is joined by the glass 13 via a pair of magnetic core halves 11, 12.

A distance R in FIG. 1 is provided on the front side of the magnetic core half 11 constituting the read / write core 7.
1 is about 0.2 mm and the distance R2 is about 1 mm.
a. The groove 6 has a depth t7 of about 0.1 mm. The grooves 6 are formed by means such as powder etching in the process of manufacturing the magnetic head. In addition, the groove 6 generates pressure so as to narrow a gap between the flexible disk and the magnetic head by an air flow generated by rotating the flexible disk during recording and reproduction of an information signal. Therefore, in the magnetic head 1, the magnetic gaps g1, g2, and g3 can be brought into sliding contact with the flexible disk.

A coil 14 wound around a coil bobbin is attached to the front magnetic core half 11 of the pair of magnetic core halves 11 and 12. Although not shown, a back core made of a magnetic material is attached to the front magnetic core half 11 so as to be magnetically joined to the other magnetic core half 12 to form a closed loop.

When reproducing the information signal recorded on the flexible disk of the lower specification, the information signal recorded on the flexible disk is converted into an electric signal by the coil 14 and output. When an information signal is recorded on a flexible disk of a lower specification, an information signal to be recorded on the flexible disk is supplied to the coil 14 as an electric signal.

The erasing core 8 is a magnetic core for erasing. Both ends of the track of the flexible disk formed immediately after the information signal is recorded by the read / write core 7 on the flexible disk of the lower specification. This is for performing an erasing process on the portion. Thereby, when recording the information signal on the flexible disk of the lower specification, even if the position of the magnetic head 1 is slightly shifted,
Magnetic insulation between adjacent tracks is ensured.

The erasing core 8 has a medium sliding surface 1a.
A substantially I-shaped magnetic core half 16 disposed on the front side and a substantially L-shaped magnetic core half 17 disposed on the rear side are formed such that the concave portion 15 is formed on the opposite side of the magnetic core half. It is joined by the glass 18 via the gap g2. Here, the magnetic core halves 16 and 17 are made of a magnetic material having excellent soft magnetic properties such as ferrite. And the magnetic gap g2 is
The glass 18 is formed from the medium sliding surface 1a to the glass 18. The glass 18 allows the pair of magnetic core halves 16,
17 are joined via a magnetic gap g2.

As described above, immediately after the information signal is recorded on the flexible disk of the lower specification by the read / write core 7, the erasing core 8 is applied to both sides of the recorded information signal. To perform an erasing process. Therefore, as shown in FIG. 1, the magnetic gap g2 of the erase core 8 is formed so as to have gap portions at positions corresponding to both sides of the magnetic gap g1 of the read / write core 7, respectively.

The distance R1 shown in FIG. 1 is set to about 0.2 mm and the distance R2 is set to about 1 mm behind the magnetic core half 17 constituting the read / write core 7.
The groove 6b is formed with a depth t7 of 0.1 mm. The groove 6b is formed by means such as powder etching in the process of manufacturing the magnetic head. In addition, the groove 6b can generate a negative pressure between the flexible disk and the magnetic head 1 when the flexible disk is rotationally driven during recording and reproduction of an information signal. Therefore, when recording / reproducing an information signal, the magnetic head 1 can record / reproduce the information signal by sliding on the flexible disk without largely floating on the flexible disk.

The rear magnetic core half 17 of the pair of magnetic core halves 16 and 17 constituting the erasing core 8 is assembled with a coil 19 wound around a coil bobbin. Although not shown, these magnetic core halves 1 and 2 are magnetically coupled to each other to form a closed loop.
Back cores 6 and 17 made of a magnetic material are attached. When an information signal is recorded on a lower specification flexible disk, a signal for erasing is supplied to the coil 19 as an electric signal.

The read / write core 7 and the erase core 8 are joined in a state of being magnetically insulated by the glass 9 as described above, and
Is composed. Here, the read / write core 7 and the erase core 8 are arranged such that the read / write core 7 is located on the front side and the erase core 8 is located on the rear side. 7 and a magnetic core half 16 on the front side of the erasing core 8.
Are joined by the glass 9. Further, the read / write core 7 and the erase core 8 have a continuous upper surface, whereby the read / write core 7
Medium sliding surface 1a from the surface to the erase core 8
Is formed.

The upper magnetic core 3 joined via the lower magnetic core 2 and the spacer 4 as described above reproduces information signals recorded on the upper-specification flexible disk and converts the information signal to the upper-specification flexible disk. On the other hand, it is for recording an information signal, and is a so-called metal-in-gap type magnetic core in which a magnetic metal film is formed on the surface on which the magnetic gap g3 is formed.

The upper magnetic core 3 is, as shown in FIG.
A substantially L-shaped magnetic core half 21 disposed on the front side such that a recess 20 is formed on the opposite side of the medium sliding surface 1a;
The substantially I-shaped magnetic core half 22 disposed on the rear side is joined by a glass 23 via a magnetic gap g3. Here, the magnetic gap g3 is formed from the medium sliding surface 1a to the glass 23, as shown in FIG.
1 and 22 are joined. In the present embodiment, in a state where the pair of magnetic core halves 21 and 22 are joined, the length dimension t8 of the sliding direction A is formed to be about 0.9 mm, and a direction orthogonal to the sliding direction A is provided. Has a length t9 of about 0.2 mm.

The magnetic core half 21 disposed on the front side comprises a magnetic material 21a having excellent soft magnetic properties such as ferrite and a magnetic metal film 21b having high magnetic permeability. Similarly, the magnetic core half 21 is disposed on the rear side. The magnetic core half 22 is also made of a magnetic material 22a having excellent soft magnetic properties such as ferrite and a magnetic metal film 2 having a high magnetic permeability.
2b. Then, these magnetic metal films 21b,
22 b is formed on the joint surface between the pair of magnetic core halves 21 and 22, and contributes to improving the magnetic characteristics of the upper magnetic core 3.

The upper magnetic core 3 is formed smaller than the lower magnetic core 2. As a result, the magnetic resistance of the upper magnetic core 3 is reduced, and excellent magnetic characteristics suitable for the upper specification in which the recording density and the data transfer rate are improved can be obtained. A non-magnetic material 2 made of, for example, ceramic or glass
Similarly, the rear end side is filled with a non-magnetic material 25 made of, for example, ceramic or glass, whereby the length of the upper magnetic core 3 in the sliding direction A is increased. The length dimension is set substantially equal to the length dimension of the lower magnetic core 2.

A coil 26 wound around a coil bobbin is attached to the magnetic core half 21 constituting the magnetic core 3 for higher order.
Is assembled with a coil 27 wound around a coil bobbin. Although not shown, these magnetic core halves 2 are magnetically coupled so that one magnetic core half 21 and the other magnetic core half 22 form a closed loop.
Back cores made of a magnetic material are attached to 1 and 22. When reproducing the information signal recorded on the flexible disk of the higher specification, the information signal recorded on the flexible disk is extracted as an electric signal by the coils 26 and 27. When recording an information signal on a flexible disk of a higher specification, the signals to be recorded on the flexible disk are the coils 26 and 2.
7 is supplied as an electric signal.

As shown in FIG. 1, the lower magnetic core 2 and the upper magnetic core 3 are
Are arranged in parallel to the sliding direction A and joined. Here, the lower magnetic core 2, the spacer 4, and the upper magnetic core 3 have their surfaces continuous.
As a result, a smooth medium sliding surface 1a is formed over the lower magnetic core 2, the spacer 4, and the upper magnetic core 3.

The lower magnetic core 2 and the upper magnetic core 3 joined via the spacer 4 as described above are embedded in the slider 5 as described above. That is, the upper magnetic core 3, the spacer 4, and the lower magnetic core 2 are joined and integrated, buried in a hole formed in the slider 5, and the gaps between the slider 5 and the glass 28 and 29 are filled. Is fixed to the slider 5. In the present embodiment, the length t5 of the glass 28, 29 in the sliding direction A is about 2.4 mm, and the length t10 of the glass 28 in the direction orthogonal to the sliding direction A is about 0. .22m
m, the length t11 in the direction perpendicular to the sliding direction A of the glass 28 is formed to be about 0.05 mm.

Here, the slider 5 is made of a ceramic such as calcium titanate which has excellent wear resistance and sliding characteristics. The slider 5 has a hole into which the upper magnetic core 3, the spacer 4, and the lower magnetic core 2 are joined and integrated. The slider 5 has a medium sliding surface 1b formed at a position symmetrical to the hole. As shown in FIG. 2, the slider 5 has the height dimension of the medium sliding surface 1a formed by joining the upper magnetic core 3, the spacer 4, and the lower magnetic core 2 into one hole and being embedded in the hole. And the height dimension of the medium sliding surface 1b is made equal. The slider 5 has a groove t between the medium sliding surface 1a and the medium sliding surface 1b in a direction perpendicular to the sliding direction A.
It is formed as. In this embodiment, the hole formed in the slider has a length t5 in the sliding direction A of about 2.4 mm and a length t12 in a direction perpendicular to the sliding direction A of about 0.9 mm. Is formed.

The spacer 4 is formed of a non-magnetic material such as a ceramic or a glass having wear resistance, and its length dimension is the length dimension of the lower magnetic core 2 and the upper magnetic core 3 in the sliding direction A. Is almost equal to The spacers 4 are joined by welding glass so as to face the lower magnetic core 2 and the upper magnetic core 3. In the present embodiment, the spacer 4 has a length t5 in the sliding direction A.
Is about 2.4 mm, and the length t14 in the direction orthogonal to the sliding direction A is about 0.15 mm.

In the above-described magnetic head 1, as shown in FIG. 5, the lower magnetic core 2 and the upper magnetic core 3 are manufactured in different steps, and then the lower magnetic core 2 and the upper magnetic core 3 are manufactured. Are joined via a spacer 4 to form a slider 5
It is manufactured by embedding in.

The lower magnetic core 2 is manufactured by manufacturing the read / write core 7 and the erase core 8 by separate processes, and then joining the read / write core 7 and the erase core 8. Manufactured by That is, first, the manufacturing process of the read / write core 7 is as follows.
In -1, a block material such as ferrite is formed into a predetermined shape, and the magnetic core halves 11, 12 are formed into a predetermined shape. Next, in step S-2, the pair of magnetic core halves 11, 12 formed in step S-1 are fused with the glass 13. By this step, a magnetic gap g1 in which the magnetic core halves 11, 12 function as the read / write core 7 is formed. Next, in S-3, the side surfaces of the pair of magnetic core halves 11, 12 to which the spacers 4 are joined in a later step are polished to complete the read / write core 7.

On the other hand, the manufacturing process of the erase core 8 is as follows.
At -4, a block material such as ferrite is formed into a predetermined shape, and the magnetic core halves 16 and 17 are formed. Next, in S-5, the pair of magnetic core halves 16 and 17 formed in S-4 are fused with the glass 18. Through this step, a magnetic gap g2 for erasing signals from the read / write core 7 is formed. Next, in S-6, the side surfaces of the pair of magnetic core halves 16, 17 to which the spacers 4 are joined in a later step are polished to complete the erase core 8.

Then, in S-7, the above-mentioned S-3
The read / write core 7 manufactured in step (1) and the erase core 8 manufactured in step S-6 are joined together by a fusion glass with their opposing bonding surfaces facing each other via the spacer 4.

Next, in S-8, recesses 10 and 15 are formed so that the coils 14 and 19 can be assembled in a later step.

Next, in S-9, the read / write core 7 and the erase core 8 joined via the glass 9 are cut to a predetermined thickness in a direction perpendicular to the sliding direction A. Each is completed as the lower magnetic core 2.

On the other hand, in the manufacturing process of the upper magnetic core 3, first, in S-10, a block material such as ferrite is cut into a predetermined shape to form a block material of the magnetic core halves 21 and 22. Here, the block material of the magnetic core halves 21 and 22 has a size capable of cutting out many upper magnetic cores 3. Next, in S-11, the magnetic metal films 21b and 22b are formed by sputtering in a portion where the magnetic gap g3 is to be formed. Next, in S-12, the pair of block members on which the magnetic metal films 21b and 22b are formed in S-11 are fused with the glass 23. The magnetic gap g3 corresponding to the upper specification flexible disk is formed by the process of S-12. Next, in S-13, side blocks 24 and 25 made of a nonmagnetic material made of, for example, ceramic or glass are joined to both sides of the two magnetic core halves 21 and 22. This S-13
Thereby, the length dimension t5 of the upper magnetic core 3 and the lower magnetic core 2 in the sliding direction A becomes equal. Next, in S-14, a concave portion 20 in which the coils 26 and 27 are assembled in a later step is formed. Next, in S-15, the upper magnetic core 3 is completed by being cut to a predetermined thickness in a direction orthogonal to the sliding direction A.

In the lower magnetic core 2 and the upper magnetic core 3 manufactured through the above steps, the lower magnetic core 2 and the upper magnetic core 3 are joined via the spacer 4 in S-16. You. Here, the spacer 4 and the lower magnetic core 2
After the masking process is performed on the bonding surface between the and the upper magnetic core 3, the masked surface is mask-bonded.

Next, in S-17, the lower magnetic core 2, spacer 4 and upper magnetic core 3 are integrated with the hole formed in the integrated slider 5 in the state integrated in S-16. Embed. Then, the gaps between the lower magnetic core 2 and the hole formed in the slider 5 and the gap between the upper magnetic core 3 and the hole formed in the slider 5 are filled with glass 28 and 29, thereby lowering the lower magnetic core. The core 2, the spacer 4, and the upper magnetic core 3 are fixed at predetermined positions.

Next, in S-18, the medium sliding surface 1a
Is polished smoothly. In this S-18, the medium sliding surface 1a is polished smoothly, so that even when the medium sliding surface 1a is in sliding contact with the flexible disk during recording and reproduction, the friction between the medium sliding surface 1a and the flexible disk is increased. Is reduced. At this time, the medium sliding surface 1a is formed so as to have a predetermined curvature in the sliding direction A. Further, the medium sliding surface 1a may be formed into a spherical shape.

Next, in S-19, as a pretreatment for powder etching, a resist functioning as a protective layer is applied to the medium sliding surface 1a.

Next, in S-20, the medium sliding surface 1a
By performing a powder etching, a groove 6 is formed as shown in FIG. As described above, the groove 6 has a predetermined curvature and is formed on the front side of the magnetic gap g1, the rear side of the magnetic gap g2, and the front side and the rear side of the magnetic gap g3.

The groove 6 may be formed as described above, or may be formed in a donut shape so as to include the slider 5. At this time, the arc-shaped groove 6 is formed by the magnetic gap g.
1, g2, and g3 are formed in an arc shape so as to surround them. Here, in the present embodiment, the radius of the inner circumferential circle of the arc-shaped groove 6 is about 0.2 mm, the radius of the outer circumferential circle is about 1 mm, and the depth is about 0.1 mm. I have. In addition,
As described above, the groove 6 may be formed in an arc shape, but need not be completely arc shape. By forming the groove 6 in an arc shape, the forming process can be facilitated.

Next, in S-21, the medium sliding surface 1a
To complete the head chip.

Next, in S-22, the coils 26, 2
7 are assembled into the recesses 20 of the respective upper magnetic cores. Similarly, after the coils 14 and 19 are assembled into the recesses 10 and 15 of the lower magnetic core 3, the back core is joined. Then, in S-23, the head chip on which the coil and the back core are mounted is mounted on the gimbal.

The magnetic head according to the present invention has a state in which the lower magnetic core 2, the spacer 4, and the upper magnetic core 3 are integrated into the holes provided in the slider 5 integrated as described above. The lower magnetic core 2, the spacer 4, and the upper magnetic core 3 are integrated by the first slider 30 and the second slider 31, as shown in FIG. The present invention may be applied to a magnetic head manufactured by being joined so as to be sandwiched. In the following description, the same portions as those of the above-described magnetic head are denoted by the same reference numerals, and detailed description thereof will be omitted.

As shown in FIG. 7, such a magnetic head includes a lower magnetic core 2 for recording / reproducing a flexible disk used for a lower specification, and a magnetic disk for recording / reproducing a flexible disk used for a higher specification. An upper magnetic core 3 for reproducing, a spacer 4 for magnetically separating the upper magnetic core 2 and the lower magnetic core 3, a first slider 30 joined to the lower magnetic core 2, And a second slider 31 joined to the magnetic core 2 for use, and the upper surface thereof serves as a medium sliding surface. On the medium sliding surface, arc-shaped grooves 6a and 6b are formed so as to surround the magnetic gaps g1, g2 and g3.

The first slider 30 is made of a non-magnetic material such as ceramic having excellent abrasion resistance and sliding characteristics, such as calcium titanate, and has a length in the sliding direction A of the lower magnetic core 2. , The spacer 4 and the upper magnetic core 3 are formed so as to have a length substantially equal to the length in the sliding direction A of the magnetic head. Then, the first slider 30
The joining projection is joined to the side surface of the lower magnetic core 2 and is fixed to the lower magnetic core 2 by fusion glass.

The second slider 31 is also made of a non-magnetic material such as a ceramic having excellent wear resistance such as calcium titanate, and has a length dimension in the sliding direction A of the lower magnetic core 2 and the spacer. 4 and the length of the upper magnetic core 3 are substantially equal to each other. In the second slider 31, a step is formed at the upper edge of the side surface facing the upper magnetic core 30 over the entire area in the sliding direction A. Then, the second slider 31 has the joining projections abutting against the side surface of the upper magnetic core 3 and is fixedly joined to the upper magnetic core 3 by fusion glass.

The upper surfaces of the first slider 30 and the second slider 31 are flush with the upper surfaces of the lower magnetic core 2, the spacer 4, and the upper magnetic core 3.
Thereby, the first slider 30, the lower magnetic core 3
1, a smooth medium sliding surface 1a is formed over the spacer 4, the upper magnetic core 3, and the second slider 31. However, the medium sliding surface 1a is provided on the side where the lower magnetic core 2 and the upper magnetic core 3 are disposed by grooves formed on the upper surface of the second slider 31, and only the second slider 31 is disposed. The side is divided into.

FIG. 7 shows a method of manufacturing such a magnetic head.
As shown in (1), after the lower magnetic core 2 and the upper magnetic core 3 are manufactured in different steps, the lower magnetic core 2 and the upper magnetic core 3 are joined via the spacer 4,
It is manufactured by joining a first slider 30 and a second slider 31 to the side surfaces of the lower magnetic core 2 and the upper magnetic core 3, respectively.

The lower magnetic core 2 is manufactured by forming the read / write core 7 and the erase core 8 by different processes, and then joining the read / write core 7 and the erase core 8. Produced by That is, the manufacturing process of the read / write core 7 is performed in the same manner as in the method of manufacturing the magnetic head shown in FIG.
In step -9, the lower magnetic core 2 was manufactured, and S-1
In the steps 0 to S-15, the upper magnetic core 3 is manufactured.

As shown in FIG. 7, the lower magnetic core 2 and the upper magnetic core 3 manufactured through the above steps are
In 16, the surface of the lower magnetic core 2 opposite to the surface to which the spacer 4 is bonded is joined to the first slider 30 by glass fusion, and the spacer 4 of the upper magnetic core 3 is joined. The second slider 31 is joined to the second slider 31 by glass fusion. At this time, in S-16, the surface where the first slider 30 is bonded to the lower magnetic core 2, the both side surfaces of the spacer 4, and the second
The surface of the slider 31 to be joined to the upper magnetic core 3 is subjected to a molten glass mask processing. Then, the first slider 30, the lower magnetic core 2, the spacer 4, the upper magnetic core 3, and the second slider 31 are integrated by joining the masked surfaces with a mask.

Next, in S-17, the medium sliding surface 1a
Is polished with a predetermined accuracy. In step S-17, the medium sliding surface 1a is polished smoothly so that the friction between the medium sliding surface 1a and the flexible disk does not occur even when the medium sliding surface 1a is in sliding contact with the flexible disk during recording and reproduction. Is reduced.

Next, in S-18, the medium sliding surface 1a
Then, a resist is applied as a protective layer. Next, S-19
In FIG. 6, grooves 6 are formed by performing powder etching on the medium sliding surface 1a, as shown in FIG. As described above, the groove 6 is formed on the front side of the magnetic gap g1, on the rear side of the magnetic gap g2, and on the magnetic gap g3.
Formed on the front side and the rear side. Also, this groove 6
Although it may be formed as described above, it may be formed in an arc shape. At this time, the arc-shaped groove 6 is formed by the magnetic gaps g1, g
2 and g3. Although the groove 6 may be formed in an arc shape as described above, it is not necessary that the groove 6 be completely arc shape. In this manner, by forming the groove 6 in an arc shape, the step of forming the groove 6 is simplified. next,
In S-20, the medium sliding surface 1a is cleaned to complete the head chip.

Next, in S-21, the coils 14, 1
9 is assembled to the recesses 10 and 15 of the lower magnetic core, and similarly, after the coils 26 and 27 are assembled to the recess 20 of the upper magnetic core 3, the back core is joined. Then, in S-22, the head chip on which the coil and the back core are mounted is mounted on the gimbal.

Next, recording and reproduction of an information signal by the magnetic head according to the present embodiment as described above will be described.

When recording / reproducing to / from a flexible disk is performed by the magnetic head 1, as shown in FIG.
A pair of magnetic heads 1A and 1B are used. The magnetic heads 1A and 1B shown in FIG. 8 are manufactured such that the lower magnetic core 2, the spacer 4, and the upper magnetic core 3 are integrated and sandwiched between the first slider 30 and the second slider 31. It is a magnetic head. This magnetic head is characterized in that a groove 6 is formed in an arc shape so as to surround the magnetic gaps g1, g2, g3. In addition, FIG.
FIG. 3 is a side view of the magnetic head.

When recording / reproducing information signals with the magnetic heads 1A and 1B, the magnetic heads 1A and 1B are arranged so as to face each other with a flexible disk D which is rotatably driven therebetween. The medium sliding surface 1a of one magnetic head 1A is slid on one surface of the disk D, and the medium sliding surface 1a of the other magnetic head 1B is slid on the other surface of the flexible disk D. Thereby, the flexible disk D slides with respect to each of the magnetic heads 1A and 1B. And like this,
Magnetic heads 1A, 1B on both sides of flexible disk D
The recording / reproducing is performed from both sides by the magnetic heads 1A and 1B by rotating the flexible disk D in a state in which the sliders are brought into sliding contact.

At this time, since the grooves 6 are formed on the medium sliding surface 1a of the magnetic heads 1A and 1B, the air flow generated by rotating the flexible disk drives the magnetic heads 1A and 1B in the direction a in FIG. That is, pressure is generated so as to narrow the gap with the flexible disk.

When an information signal is recorded on the flexible disk D when the flexible disk D is a medium of lower specification, the flexible disk D is rotated at about 300 rpm while the flexible disk D is rotated. The magnetic head 1A is brought into sliding contact with one surface, and the magnetic head 1B is brought into sliding contact with the other surface of the flexible disk D, so that these magnetic heads 1A, 1
An information signal is recorded on the flexible disk D using the lower magnetic core 2 of B.

At this time, immediately after the signal is recorded by the read / write core 7 of the lower magnetic core 2, both sides of the signal recorded are erased by the erase core 8 of the lower magnetic core 2. Apply. As a result, a guard band between adjacent tracks is compensated.

When the information signal is reproduced from the flexible disk D when the flexible disk D is a medium of lower specification, the flexible disk D is rotated at 300 rpm and the flexible disk D is rotated. The magnetic head 1A is slid on one surface, and the magnetic head 1B is slid on the other surface of the flexible disk D.
The information signal is reproduced from the flexible disk D using the lower magnetic cores 2 of A and 1B. At this time, of the lower magnetic cores 2, the erase core 8 is not used, and
The information signal recorded on the flexible disk D is reproduced using only the read / write core 7.

On the other hand, when recording / reproducing an information signal on the flexible disk D when the flexible disk D is a medium of a higher specification, the flexible disk D
The magnetic head 1A is slid on one surface of the flexible disk D while the magnetic head 1B is slid on the other surface of the flexible disk D in a state where the magnetic head 1B is rotated at a high speed of about 1200 to 3600 rpm. ,
An information signal is recorded and reproduced from the flexible disk D by using the upper magnetic core 3 of the magnetic heads 1A and 1B.

At this time, the magnetic heads 1A and 1B have grooves 6 at the front and rear sides of the magnetic gaps g1, g2 and g3.
Are formed, pressure is generated in the direction a in FIG. Therefore, even if the flexible disk D is driven to rotate at a high rotational speed, the magnetic heads 1A and 1B do not float greatly due to the floating force due to the airflow from the flexible disk D, and slide with respect to the flexible disk D. It is possible to perform recording and reproduction while doing so.

When recording / reproducing data to / from the medium having the higher specification, a servo signal is recorded on the flexible disk D in advance, and the tracking servo is controlled by detecting the servo signal. To As a result, the tracking error is reduced, the track can be easily narrowed, and the recording density can be greatly improved.

[0088]

As described in detail above, in the magnetic head according to the present invention, the medium sliding surface having a curved surface formed with a predetermined curvature in the sliding direction slides on the recording medium and the information signal is transmitted. In the magnetic head for performing recording and reproduction of the, since grooves are formed before and after the sliding direction of the medium sliding surface, during recording and reproduction, by rotating the recording medium,
Even if a levitation force is applied from the recording medium, pressure is generated to narrow the gap with the recording medium, and the medium sliding surface is large and does not float from the recording medium, and the medium sliding surface slides on the recording medium. It is possible to record and reproduce information signals while recording. Therefore, this magnetic head is rotated at a rotational speed of about 300 rpm to record and reproduce information signals, and a recording medium is rotationally driven at a rotational speed of about 1200 rpm or more to record and reproduce information signals. Recording and reproduction can be performed while sliding both recording media. In addition, since the magnetic head performs recording while sliding on the recording medium by forming grooves on the medium sliding surface, the reproduction output is improved, and the linear recording density of the recording medium can be improved. It is.

[Brief description of the drawings]

FIG. 1 is a plan view showing an example of a magnetic head according to the present invention.

FIG. 2 is a side view showing an example of the magnetic head.

FIG. 3 is a front view showing an example of a lower magnetic core used for recording / reproducing an information signal of a flexible disk of a lower specification.

FIG. 4 is a front view showing an example of an upper magnetic core used for recording / reproducing an information signal of a flexible disk of a higher specification.

FIG. 5 is a schematic view showing an example of a manufacturing process of the magnetic head.

FIG. 6 is an exploded perspective view showing another example of the magnetic head.

FIG. 7 is a schematic view showing another example of the manufacturing process of the magnetic head.

FIG. 8 is a schematic diagram showing a state in which an information signal is recorded and reproduced on a flexible disk by the magnetic head.

[Explanation of symbols]

Reference Signs List 1 magnetic head, 2 lower magnetic core, 3 upper magnetic core, 4 spacer, 5 slider, 6 groove, 7 read / write core, 8 erase core

Claims (3)

[Claims] 1. A magnetic head for recording and reproducing an information signal by sliding a medium sliding surface having a curved surface formed with a predetermined curvature in a sliding direction on a recording medium, wherein A magnetic head having grooves formed in front and rear. 2. The magnetic head according to claim 1, wherein the groove is formed in an arc shape on the medium sliding surface. 3. The magnetic head according to claim 1, wherein the medium sliding surface is formed in a spherical shape.