JPH07272207A - Magnetic head - Google Patents

Abstract

PURPOSE:To reduce the size, weight and production cost of a magnetic head by forming sliders in a composite type consisting of a ceramic material and a synthetic resin material. CONSTITUTION:Only the side faces for sliding with magnetic recording media of a core assembly 1 having magnetic cores 5 and coils 6a, 6b and the two sliders A2, B3 holding this core assembly 1 and maintaining the sliding state with the magnetic recording media are formed of the ceramic material. A holding base 4 which holds the sliders A2, the slider B3 and of which the parts enclosing the coils 6a, 6b consist of the synthetic resin material is formed. As a result, the ceramic material of the slider A2, the slider B3 are made into a simple structure. The need for shielding members is eliminated by compounding soft ferrite at >=85% by weight with the synthetic resin material to provide the holding base with an effect of shielding external noises.

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 more particularly to the structure of a magnetic head mounted on a flexible disk device.

[0002]

2. Description of the Related Art Conventionally, in this type of magnetic head, as shown in FIG. 3, a core assembly 11 having a magnetic core 15 and a coil (not shown) for writing / reading information is magnetically recorded. Two sliders A12 made of a ceramic material for contacting and sliding on a medium (not shown) surface,
It is sandwiched by the slider B13. A shield portion 14 that shields the core assembly 11 from external noise (electromagnetic waves) is provided around the sliders A12 and B13. The magnetic head is assembled by adhering the slider A12, the slider B13, and the magnetic core 15 using glass or synthetic resin, mounting a coil, and adhering and fixing the shield portion 14.

There is also one using a slider made of a synthetic resin molded by an injection molding method (for example, Japanese Patent Laid-Open No. 3-1.
87013). In the floppy head disclosed therein, two divided synthetic resin sliders are bonded and integrated on both side surfaces of a ferrite core along the track direction, and the core and the two slider sliders in the track direction are integrated. The lengths are almost the same.

[0004]

In the above-mentioned conventional magnetic head, in the former case, the slider made of ceramic is fixed to the gimbal spring on the opposite side to slide on the magnetic recording medium. However, since a slider is manufactured by a powder metallurgy method, a special baking furnace is required. Further, there is a drawback that the workability is very poor due to its hardness, special equipment is required, and the manufacturing cost becomes high. Also, the magnetic head core assembly 1
When receiving external noise (electromagnetic field) at the time of writing / reading data, the noise waveform is superimposed on the signal waveform or the signal waveform is distorted, which causes an error. A structure in which the outer circumference of the magnetic head is surrounded by a soft magnetic material (for example, an iron-nickel alloy or the same material as the magnetic core) is generally used, but both of these require heat treatment such as annealing and sintering.
There is a problem that expensive equipment is required.

Further, in the latter case, there is a drawback that the slider by sliding on the magnetic recording medium is inferior in durability as compared with the conventional slider made of a ceramic material.

[0006]

SUMMARY OF THE INVENTION The present invention provides a magnetic core having a gap for writing / reading information to / from a magnetic recording medium, a core assembly having a coil wound around the magnetic core, and In a magnetic head having a slider that holds a core assembly from both sides and has a sliding surface for sliding on the magnetic recording medium, at least a portion surrounding the coil of the slider is made of a synthetic resin material. Is characterized by.

Further, the synthetic resin material is polyphenylene sulfide resin.
Fide: PPS), and soft ferrite may be added to the polyphenylene sulfide resin (PPS), and the mixing ratio may be 85% or more by weight.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, the present invention will be described with reference to the drawings. FIG. 1 is a perspective view showing an embodiment of the magnetic head of the present invention. FIG. 2 is an exploded perspective view showing the details of FIG.

The magnetic head of the present embodiment is shown in FIGS.
As shown in FIG. 2, a plurality of magnetic cores 5 each having a gap portion formed by forming a plate-shaped magnetic material and bonding them and the bonding portions provided at the end portions of these magnetic cores 5 are respectively wound around two bobbins. A core assembly 1 having a coil 6a and a coil 6b, and two sliders A2 and B3 for holding the core assembly 1 and maintaining a sliding state with a magnetic recording medium (not shown). Further, the slider portion is provided with a holding table 4 in which only the medium sliding surface side is made of a ceramic material, and the sliders are held, and a portion surrounding the coils 6a and 6b is made of a synthetic resin material. There is.

In the magnetic head of the present invention, the holding table 4 made of a synthetic resin material is manufactured by the injection molding method. The synthetic resin material used for the holding table 4 is a stable crystalline resin and has extremely high physical properties among the thermoplastic resins, and mechanical parts that require rigidity and durability, heat resistance and noncombustibility. Widely used in electrical parts that require corrosion resistance, chemical equipment that requires corrosion resistance, and other engineering plastics such as polyphenylene sulfide resin (PP
S) is used.

Then, the slider A2 and the slider B3 are adhered to the magnetic core 5 and to the holding base 4 for assembly, and further, in order to stabilize the sliding state with the magnetic recording medium during operation, The medium sliding surface side of the slider A2 and the slider B3 is polished and chamfered to finish a smooth surface.

[0012] Further, polyphenylene sulfide resin is blended with soft ferrite having a high saturation magnetic flux density (soft ferrite), and the blending ratio is set to 85% or more by weight ratio, thereby facilitating the processability of the synthetic resin. The magnetic properties of soft ferrite can be combined. As a result, the magnetic head of the present invention has the coil 6
Since a and the coil 6b are surrounded, a shield effect against external noise can be provided.

[0013]

As described above, the magnetic head of the present invention is made of a so-called composite type in which the two sliders are made of two materials, that is, a ceramic material and a synthetic resin material. Since the slider has a simple structure, the manufacturing cost can be reduced. Further, since the sliding surface with respect to the magnetic recording medium is made of the ceramic material as in the conventional case, the sliding characteristics are not deteriorated.

Further, in the magnetic head of the present invention, the synthetic resin material used for the slider portion is mixed with soft ferrite, and the structure surrounding the coil portion improves the shield characteristic against external noise. Therefore, the conventionally used shield part can be deleted, expensive heat treatment equipment is not required, and the manufacturing cost can be reduced, and the size and weight can be reduced.

[Brief description of drawings]

FIG. 1 is a perspective view showing an embodiment of a magnetic head of the present invention.

FIG. 2 is an exploded perspective view showing details of FIG.

FIG. 3 is a perspective view showing a conventional example.

[Explanation of symbols]

 1, 11 Core assembly 2, 12 Slider A 3, 13 Slider B 4 Holding base 5, 15 Magnetic core 6a, 6b Coil 14 Shield part

Claims (3)

[Claims] 1. A core assembly having a magnetic core having a gap for writing / reading information to / from a magnetic recording medium, and a core assembly having a coil wound around the magnetic core.
In a magnetic head that holds the core assembly from both sides and has a slider having a sliding surface for sliding on the magnetic recording medium, at least a portion surrounding the coil of the slider is made of a synthetic resin material. A magnetic head characterized in that 2. The magnetic head according to claim 1, wherein the synthetic resin material is made of polyphenylene sulfide resin. 3. A soft ferrite is blended with the polyphenylene sulfide resin, and the blending ratio is 8 by weight.
The magnetic head according to claim 2, wherein the content is 5% or more.