JPH02172003A - magnetic head - Google Patents

Abstract

PURPOSE:To stabilize durability and operating characteristics and to prevent the generation of damages on a medium surface at the time of sliding with a head by adopting the constitution in which the thicknesses of a head core in the direction perpendicular to a sliding surface vary. CONSTITUTION:Groove parts 3 for regulating the track width are worked to a head core block 1 consisting of a high permeability material and thereafter, the block is subjected to glass molding. A gap 4 for reproduction and a winding groove 5 are provided and the block is sliced to form the head core 1'. Both side surfaces of the core 1' are worked to form the T-shaped core 2. The thicknesses t1 to t3 in the respective parts of the core 2 are set at adequate thicknesses by taking the mechanical strength, electromagnetic conversion characteristics and wear resistance into consideration. Sliders 7, 8 are then adhered to the head core 2 via an adhesive layer 9 and the magnetic head is thus obtd.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention is applicable to, for example, a floppy disk device (hereinafter referred to as FDD).
The present invention relates to a magnetic head suitable for performing high-density recording on magnetic disks such as .

BACKGROUND OF THE INVENTION Floppy disks, which are an example of conventional magnetic disks, are relatively easy to handle and can record a large amount of information, so their use as external recording devices for personal computers, minicomputers, etc. is expanding. in recent years,
Furthermore, there is a growing trend toward higher density FDD devices, and therefore magnetic heads are required to improve short wavelength recording characteristics so as to increase linear recording density.

The configuration of a conventional magnetic head will be described below with reference to the drawings. FIG. 3 is a perspective view showing the structure of a conventional magnetic head. A head core 10 having a recording/reproducing gap is generally attached to a pair of sliders 11 made of ceramic or the like using an organic adhesive made of epoxy resin or the like.
It has a structure in which it is glued with 12. 13 is an adhesive layer made of the organic adhesive.

Problems to be Solved by the Invention However, in the magnetic head configured as described above, an organic adhesive made of epoxy resin or the like is used for -II when bonding the head core 10 and the pair of sliders 11 and 12. . However, with a core structure made of organic adhesive, it is difficult to obtain sufficient mechanical strength, heat resistance, and moisture resistance.
When used for a long period of time, the resin etc. on the adhesive surface swells and the adhesive surface becomes misaligned. In addition, uneven wear occurs due to the difference in wear speed between the slider and the helad core, and in either case, spacing occurs near the recording/reproducing gap, resulting in unstable operating characteristics such as a decrease in head output. there were. Furthermore, since the adhesive layer 13 made of an organic adhesive is exposed on the sliding surface with the recording medium, if the adhesive layer 13 has a protruding shape, the sliding surface with the recording medium will be exposed. When moving, there was a problem in that damage such as scratches was caused to the surface of the medium.

In view of the above-mentioned problems, the present invention provides a magnetic head which has extremely stable durability and operating characteristics and which does not cause damage such as scratches to the medium surface even when the head slides.

Means for Solving the Problems In order to solve the above problems, the magnetic head of the present invention has a head core having a recording/reproducing gap that has a cross section of the head core in a direction perpendicular to the sliding surface with the recording medium. The thicknesses are different so that the sliding surface side of the head core is wider. Furthermore, the structure is such that the bonding surface between the head core and ceramic or the like is not exposed on the sliding surface with the recording medium.

Effect of the Invention The present invention has the above-mentioned structure, and in the conventional magnetic head, the adhesive part between the slider and the helad core on the head sliding surface develops a step due to changes over time such as swelling of the resin, which causes recording and reproducing problems. Spacing occurs near the media gap, reducing head output, and the protruding adhesive layer causes scratches and other damage to the media surface. was. There is no adhesive layer between the head core and the ceramic slider on the head sliding surface, so there is no spacing or damage to the media surface.Also, since there is no slider near the recording/playback gear knob, the head core Also, there is no effect on the head characteristics due to uneven wear of the slider.

Therefore, the present invention provides a magnetic head that can maintain extremely stable characteristics even during long-term use.

Embodiment Hereinafter, a magnetic head according to an embodiment of the present invention will be described with reference to the drawings.

FIGS. 2(a) to 2(d) are diagrams schematically showing the manufacturing process of the magnetic head in the first embodiment of the present invention.

In FIG. 2(a), numeral 1 is a head core block made of a high magnetic permeability material, and numeral 3 is molded with processed glass with grooves for regulating the track width. Further, 4 is a recording/reproducing gap, and 5 is a winding groove. 6 is bonding glass. As shown in FIGS. 2(a) and 0), a head core block 1 is formed through the same steps as those for conventional magnetic heads, and is sliced to a predetermined thickness to obtain a head core 1'.

In conventional magnetic heads, the processing of the head core ends here, but in the magnetic head of the present invention, as shown in FIG. 2(C), both sides of the head core 1' are further processed to create a so-called T-shaped magnetic Create Herad Core 2. Here, the thickness of each part of the core is L.

The thickness of t8 is determined from the viewpoint of the mechanical strength, electromagnetic conversion characteristics, and wear resistance characteristics of the head core, and is set to 1. ．． 12,1. Adjust the thickness and process. Next, as shown in FIG. 2(d), a slider 7 made of ceramic or the like is used.
．． 8 is adhered to a head core using an organic adhesive in the same manner as a conventional magnetic head to obtain a magnetic head. FIG. 1 is a perspective view of a magnetic head in a first embodiment of the invention.

In FIG. 1, the structure is such that the bond N9 between the head core 2 and the slider 7.8 is not exposed on the head sliding surface.

As described above, according to this embodiment, the thickness of the cross section of the head core in the direction perpendicular to the sliding surface of the head core with the recording medium is different, and the sliding surface side of the head core is configured to be wider. By creating a head structure in which the adhesive surface with the slider, such as ceramic, is not exposed on the sliding surface with the recording medium, the adhesive surface between the head core, slider, and helad core, which has been a problem with conventional magnetic heads, has been improved. This eliminates the drop in head characteristics caused by the spacing near the gap caused by uneven wear between the slider and the helad core, and also eliminates damage such as scratches to the media surface caused by the protrusions on the adhesive surface. I don't give anything.

Effects of the Invention As described above, in the present invention, the head core having a recording/reproducing gap has a different thickness in the cross section of the head core in the direction perpendicular to the sliding surface with the recording medium, and the sliding surface side of the head core is wider. By configuring this structure so that the bonding surface between the ceramic slider and the helad core is not exposed on the head sliding surface, the difference in level that occurs on the bonding surface between the slider and the helad core and the slider It is possible to eliminate uneven wear between the head cores. Furthermore, it is also possible to eliminate damage such as scratches to the surface of the recording medium caused by the protruding adhesive layer.

Therefore, even during long-term use, extremely stable head characteristics can be maintained, which is highly effective.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing the structure of the magnetic head in the first embodiment of the present invention, FIG. 2 is a schematic diagram of the manufacturing process of the magnetic head in the first embodiment of the present invention, and FIG. 3 is a conventional FIG. 2 is a perspective view showing the structure of a magnetic head. l...Head core block, 2.10...
...Head core, 3...Groove molded with glass, 4...Gap for recording and reproduction, 5...
...Winding groove, 6...Pondaig glass, 7,
8, 11.12...Slider, 9.13...
...Adhesive layer. Name of agent: Patent attorney Shigetaka Awano Name of the person who wrote the name of the person who wrote the name of the person who wrote the name of the agent

Claims (3)

[Claims] (1) A magnetic head characterized in that a head core having a recording/reproducing gap is configured such that the thickness of a cross section of the head core in a direction perpendicular to a sliding surface with a recording medium is different. (2) The thickness of the cross section of the head core in the direction perpendicular to the sliding surface with the recording medium is configured such that the sliding surface side of the head core is wider.
1) The magnetic head described above. (3) Claim (1) or (2) characterized in that the adhesive surface between the head core having the recording/reproducing gap and the slider made of ceramic or the like is not exposed on the sliding surface with the recording medium.
) magnetic head according to any one of the above.