JPS63106956A - Magnetic head - Google Patents

Abstract

(57) [Abstract] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention relates to a magnetic head, and more specifically, in a magnetic recording/reproducing device, a magnetic head is used in a magnetic recording/reproducing device, in which both eight side portions of a floppy disk, which is a flexible magnetic recording medium, are sandwiched. This relates to a magnetic head that performs recording and reproduction.

[Prior Art] FIG. 5 is a perspective view showing a magnetic head used in a conventional floppy disk device.

The magnetic head shown in the figure is a floppy disk (hereinafter referred to as
It is composed of a first head section 1 and a second head section 2 which sandwich both sides of a disk (simply referred to as a disk) 30. These first. Each of the second head sections 1 and 2 is formed with first contact surfaces A and B and second contact surfaces C and D including electromagnetic transducer elements to be described later, in order to make contact with the disk 30.

That is, the first contact parts A and B are made of a non-magnetic material 3 such as ceramic.
, 4 protrudes toward the disk 30 and has a constant width Lta.

The second contact portions C and D include a non-magnetic material 5.6 provided with a certain width on the other end side of the non-magnetic material 3, 4, and a non-magnetic material 5.6 and the non-magnetic material 3.degree. It is formed to have a width of 39Ω including the electromagnetic transducers 7, 8, 9, and 10 provided between the four.

One read/write core 7°8, which is the electromagnetic conversion element,
Although not shown in detail, the read/write coil 71.81 is formed into an L shape and is inserted through it, and the ■-shaped core 72 is provided at one end and partially sandwiched between non-magnetic materials 74.84.
．． 82 and a back core 73.83 mounted between the tip of the shaped core 72.82 and the other end of the read/write core 7.8 to form a closed magnetic path. It is possible to write data and read data from the disk 30.

The other erase cores 9 and 10 are ffi magnetic conversion elements.

Two core parts 9 having the same thickness as the non-magnetic materials 74 and 84
a, 9b and 10a, 10b, a non-magnetic material 91.101 sandwiched between them, an erasing coil 92,102 inserted through the two core parts, and a non-magnetic material 92,102 provided at one end of the core part. A shaped core 93 with magnetic material 94 and 104 sandwiched therein.
103, so that data written on the disk 30 can be erased.

Said 1st. The second head sections 1 and 2 sandwich both sides of the disk 30 when the disk 30 rotates, and the first head section of one head section. the second contact surfaces A, C and the first contact surface of the other head.
The second contact surfaces B and D are arranged alternately along the radial direction of the disk 30. In that case, the first . Second contact surface A-B, C-
The width of D is Q,〉Q4,Q2〉Q.

In other words, the width n1. Q2 is the width Q4 of each second contact surface facing each other with the disk 30 in between. Qll, both first contact surfaces A, B are wider than respective second contact surfaces C,
By acting as a suppressing pad on the D side, the disk 30 is brought into contact with the second contact surface C, the electromagnetic transducer elements 7, 9, 8, and 10 on the D side.

Incidentally, related magnetic heads of this type include, for example, Japanese Patent Laid-Open No. 55-93565.

[Problems to be Solved by the Invention] By the way, the conventional floppy disk device has the first and second contact surfaces A and C of the first head section 1, the first and second contact surfaces B of the second head section 2, D are arranged alternately along the radial direction of the disk 30, so that the second
The contact surface C is located on the inner circumferential side of the disk 30, and the second contact surface of the second head portion 2 is located on the outer circumferential side of the disk 30.

Therefore, on both sides of the disk 30, the peripheral speed on the side of the first head section 1 is slower than that on the side of the second head section 2, so the recording density on the side facing the first head section 1 is higher.
If an attempt is made to increase the recording density higher than the current level, the first head section 1 will be disadvantageous in terms of characteristics compared to the second head section 2, causing a problem that it will be difficult to increase the recording density accordingly.

Also, 1st. The second head sections 1 and 2 are of a type that comes into contact with the disk 30, unlike those that float above the disk surface as in hard disk devices. There is an extremely small spacing of about a few tenths of a micrometer between the surface and the surface. Therefore, in order to achieve higher recording density, it is easy to think of reducing the spacing between the first head section 1 and the disk 30, but even if such an attempt is made, it is difficult to reduce the spacing. There are limitations, and there is a problem that it is difficult to meet the demand for higher recording density.

SUMMARY OF THE INVENTION In view of the above circumstances, an object of the present invention is to provide a magnetic head that eliminates the characteristic disadvantages of the head portion located on the inner circumferential side of the disk, and thereby allows higher recording density.

[Means for Solving the Problems] In the present invention, one of the heads in which at least the second contact surface is disposed on the outer circumferential side of the flexible magnetic recording medium has a width of the first contact surface that is larger than that of the other head. The first contact surface is formed to be narrower in the radial direction of the flexible magnetic recording medium than the width of the second contact surface in the head section, and the first contact surface is approximately co-centered with the electromagnetic transducer on the second contact surface in the other head section. placed on the line.

[Function] When the flexible magnetic recording medium is rotated, both head sections sandwich both surfaces of the flexible magnetic recording medium, and the first... The second contact surfaces are arranged alternately along the radial direction of the flexible magnetic recording medium, thus recording and reproducing.

In that case, in one head part in which the second contact surface having the electromagnetic transducer is arranged on the outer peripheral side of the flexible magnetic recording medium, the width of the first contact surface is equal to the width of the second contact surface of the other head part. Since the width of the flexible magnetic recording medium is narrower than the width of the flexible magnetic recording medium, the air flow generated by the rotation causes the airflow from the other head to the direction of the flexible magnetic recording medium to both sides of the second contact surface of the other head. When subjected to positive pressure, it deforms into a mountain shape due to its own elastic force. At this time, since the first contact surface is arranged approximately on the same center line as the electromagnetic transducer of the other head, the peak-shaped top of the flexible magnetic recording medium is located on the inner circumferential side. It is closest to the electromagnetic transducer, and the spacing between it and the electromagnetic transducer is smaller than the spacing between the electromagnetic transducers of one head.

Therefore, even if the electromagnetic transducer of the other head part is arranged on the inner circumferential side of the flexible magnetic recording medium, compared to one head part whose electromagnetic transducer element is arranged on the outer circumferential side of the flexible magnetic recording medium. However, as a result of being able to eliminate disadvantages in recording characteristics, it is possible to achieve the effect of achieving higher recording density.

[Example] Hereinafter, an example of the present invention will be described with reference to FIGS. 1 to 4. FIG. 1 is an overall perspective view showing a first embodiment of the present invention;
FIG. 2 is an enlarged explanatory view of the main parts showing the contact state between the magnetic head and the flexible magnetic recording medium, and in this figure, the same reference numerals as in FIG. 5 represent the same or equivalent parts.

Each of the magnetic heads of the embodiment has a first contact surface A.

B, and second contact surfaces C, D having read/write cores 7.8 and erase cores 9, 10, which are electromagnetic conversion elements, are provided, and a pair of first contact surfaces C, D are provided. Second head parts 1 and 2 are formed. Then, the first pair of two. The second head sections 1 and 2 sandwich a floppy disk (hereinafter simply referred to as a disk) 30, which is a flexible magnetic recording medium, with both sides facing each other. each of the second contact surfaces A, C and the first contact surface of the second head section 2; The second contact portions B and D are arranged alternately along the radial direction of the disk 30. Therefore, the electromagnetic transducer 7゜9 of the first head section 1 is more sensitive to the disk 30 than the electromagnetic transducers 8, 10 of the second head section 2.
The electromagnetic transducer elements 8 and 10 of the second head section 2 are arranged on the outer circumferential side of the disk 30.

The first contact surface A and the second contact surface C of the first head section 1 cover the entire lower surface of the non-magnetic material 3 in FIGS. It extends to the same horizontal line as the first head part 1, forming an integral shape.
The second contact surface C is a non-magnetic material 5 including electromagnetic transducers 7 and 9.
In addition, the widths Q and l are large enough to include a part of the non-magnetic material 3.

In the head portion where the electromagnetic transducers 8 and 10 are arranged on the outer peripheral side of the disk 30, that is, the second head portion 2, the width Q2' of the first contact surface B is different from the width Q2' of the second contact surface C of the first head portion 1. The width a is narrower in the radial direction of the disk 30. The width Q of the first contact surface B is determined by the read/write core 7 of the first head section 1 in the radial direction of the disk 30.
The second contact surface width Q of the first head portion 1 is wider than the contact surface width of the erasing core 9 and narrower than the second contact surface width Q of the first head portion 1 .

Further, the first contact surface B of the second head section 2 is connected to the first head section 1.
The electromagnetic transducer elements 7 and 9 are arranged substantially on the same center line. That is, the center position of the first contact surface B is
The center positions of the read/write core 7 and the erase core 9 substantially coincide with each other in the radial direction of the disk 30.

The magnetic head configured as described above has the first. Second head part 1
, 2 sandwich both sides of the disk 30, and the first . The second contact surfaces A, C and the first contact surfaces A and C of the second head portion 2.
The second contact surfaces B and D are arranged alternately in the radial direction of the disk 30, thus performing recording and reproduction.

In that case, since the second contact C having the electromagnetic transducer 7°9 of the first head section 1 is located closer to the inner circumference of the disk 30 than the second contact surface of the second head section 2, the first head Part 1
However, in the second head part 2, the contact surface width Q of the first contact surface B may be disadvantageous compared to the second head part 2.
, / are formed narrower in the radial direction of the disk 30 than the second contact surface width C' of the first head portion 1. Due to the air flow generated by the rotation of the first head part 1, the second head part 2 receives positive pressures P1 to P, and is slightly deformed into a mountain shape as shown in Fig. 2 due to its own elastic force. .

At this time, since the first contact surface B is disposed approximately on the same center line as the electromagnetic transducers 7 and 9 of the first head section 1, the mountain-shaped top of the disk 30 is disposed on the electromagnetic transducer 7,
9, the disk 30 and its electromagnetic transducer 7,
9 is smaller than the spacing between the electromagnetic transducers 8 and 10 of the second head portion 2.

Therefore, even if the electromagnetic transducers 7 and 9 of the first head section 2 are located on the inner peripheral side of the disk 30, the electromagnetic transducers 7 and 9
Since the spacing between the disk 30 and the disk 30 can be reduced,
This makes it possible to eliminate disadvantages in the recording characteristics of the electromagnetic transducers 7 and 9.

3 and 4 show a second embodiment of the invention. In this case, the first contact surface B of the second head section 2 has a constant width Ilt' protruding from one end of the non-magnetic material 4, and the second contact surface B has a constant width Ilt' extending from one end of the non-magnetic material 4, and the second contact surface B has a constant width Ilt' extending from one end of the non-magnetic body 4. The non-magnetic material 6 including the non-magnetic material 6 has a width Q, / including the portion protruding from the other end of the non-magnetic material 4'.

This embodiment differs from the first embodiment in that the first contact surface A of the first head section 1 is also formed in the same manner as the first contact surface B of the second head section 2.

That is, the first contact surface A of the first head section 1 is connected to the disk 30.
In the radial direction, the contact surface is wider than the contact surfaces of the read/write core 8 and the erase core 10 of the second head section 2, and is narrower than the second contact surface width Q4'.

Further, the center line of the first contact surface A and the center lines of the read/write core 8 and erase core 10 of the second head section 2 substantially coincide with each other in the radial direction of the disk 30.

As mentioned above, 1. First contact surface A of second head portions 1, 2
, B widths Ω□I and Q21 are the first . second head section 1,
2, the disc 30 is formed narrower than the widths Q4' and ra' of the second contact surfaces C and D of the disc 30, as shown in FIG.
Due to the air flow generated by the rotation of 0, positive pressures P1 and P7,
Upon receiving P3 and P4, it deforms into a mountain shape as shown in the figure due to its own elastic force.

At that time, each of the first contact surfaces A, B is connected to each of the electromagnetic transducers 7, 8, 9, . Since it is disposed approximately on the same center line as the IQ, the mountain-shaped top of the disk 30 is closest to the electromagnetic transducers 7, 8, 9, and 10, making it possible to reduce the spacing.

Therefore, the first. The spacing between both the second head sections 1 and 2 can be made small, and the widths of the first contact surface B of the second head section 2 and the first contact surface A of the first head section 1 can be set appropriately. For example, even if the electromagnetic transducers 7 and 9 are located on the inner circumferential side of the disk 30, disadvantages in recording characteristics can be eliminated and higher recording density can be achieved.

[Effects of the Invention] As described above, according to the present invention, the width of the first contact surface of one of the head portions in which at least the second contact surface is disposed on the outer peripheral side of the flexible magnetic recording medium is The first contact surface is formed to be narrower than the width of the second contact surface of the head portion, and the first contact surface is arranged approximately on the same center line as the electromagnetic transducer of the other head portion,
Since it is configured so that the spacing between the electromagnetic transducer of one head part and the flexible magnetic recording medium can be reduced,
As a result of being able to eliminate the disadvantage that the head portion in which the electromagnetic transducer is located on the inner circumferential side has recording characteristics compared to the other head portion, it is possible to achieve the effect of achieving a correspondingly higher recording density.

[Brief explanation of the drawing]

FIG. 1 is an overall perspective view showing the first embodiment of the present invention, and FIG.
The figure is an enlarged explanatory view of the main part showing the contact state between the magnetic head and the flexible magnetic recording medium, FIG. 3 is an overall perspective view showing the second embodiment of the present invention, and FIG. FIG. 5 is an enlarged explanatory view of the main part showing the state of contact with a flexible magnetic recording medium, and FIG. 5 is a perspective view showing a conventional magnetic head. 1... First head part, 2... Second head part, 7, 9
... Electromagnetic transducer of the first head part, 8,1o... Electromagnetic transducer of the second head part, C... Second contact surface of the first head part, B... of the second head part First contact surface, la′・
...Width of the first contact surface B, ra'...Width of the second contact surface C. Agent Patent attorney Tadashi Akimoto Jitsu No. f Figure θ・10--Electric J class exchange element 13' of W part to Ona 2
→ Width of contact surface C 2 Figure 3

Claims (1)

[Claims] 1. Forming two head parts each having a first contact surface capable of contacting a flexible magnetic recording medium and a second contact surface including an electromagnetic transducer, and the two head parts being flexible. In a magnetic head in which the first contact surface and the second contact surface of each head section are arranged alternately along the radial direction of the flexible magnetic recording medium with both sides of the magnetic recording medium sandwiched between the two surfaces, at least the second contact surface is arranged on the outer circumferential side of the flexible magnetic recording medium, and the width of the first contact surface thereof is wider in the radial direction of the flexible magnetic recording medium than the width of the second contact surface of the other head portion. What is claimed is: 1. A magnetic head characterized in that the first contact surface is formed narrowly along the length of the head, and the first contact surface thereof is arranged substantially on the same center line as the electromagnetic transducer of the other head section.