JPS61199219A - Composite type floating magnetic head - Google Patents

Abstract

PURPOSE:To simplify a head structure and to stabilize the extent of floating and to attain a stable head performance by eliminating the center rail of a magnetic head and floating the head with two side rails. CONSTITUTION:A slider 1 is so constituted that the conventional center rail is eliminated to generate the floating force with two side rails 2. A notched part is provided in the air outflow end of one rail 2, and a chip core 3 is inserted to this notched part and is fixed with a glass 4. By such a structure, the area of rails is reduced in the range where precise working is possible, and the extent of floating is reduced to about 0.3mum from 0.48mum for a conventional structure. There is only a groove part in the center part of the slider, and the air current is stabilized to hold a stable floating state, and the stable head performance is attained.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to recording on a magnetic recording medium such as a magnetic disk.
The present invention relates to a floating magnetic head that operates while floating the magnetic head above a magnetic disk in a magnetic head that performs reproduction.

[Prior Art] Conventionally, a floating magnetic head for recording and reproducing information on a magnetic recording medium has the entire head made of a magnetic material as shown in FIG. It has a structure in which site rails 2 are formed, and each rail generates a levitation force. Further, the structure is such that a recording/reproducing gap 6 is formed at the air outflow end of the center rail 5.

In addition, as shown in FIG. 4, sight rails 2 that generate levitation force on the non-magnetic slider 1 are formed on both sides of the surface facing the recording medium, and a notch is provided in the middle of the sight rails 2. There was a magnetic head, as shown in FIG. 2, in which a chip core 3 forming a recording/reproducing gap was inserted and fixed with glass 4.

Although there are differences in the slider parts and the configuration of the magnetic gap, the rails that control levitation are comprised of three rails, left, right, and center, and the magnetic core chip is located in the center of the three rails. The structure was

[Problems to be Solved by the Invention] In a floating magnetic head using three rails having a conventional structure, the total area of the pair of left and right rails and the center rail section receives air pressure and levitates. In order to achieve high-density recording of signals, it is essential to shorten the recording wavelength or narrow the track width, which tends to reduce the reproduction output. In order to prevent this reduction in reproduction output, it is necessary to minimize the flying height, increase the write leakage flux to the medium, and increase the amount of change in magnetic flux during reproduction. However, in order to reduce the flying height, the total area of the air bearing rail section must be reduced, and in the conventional three-rail structure, each rail width becomes too small, making precision machining difficult. there were.

[Means for Solving the Problems] In order to solve the above problems, the present invention eliminates the center rail, provides a notch at the air outflow end of one of the sight rails, and installs a core chip in this notch. It is characterized by an inserted structure.

[Function] With the above structure, even if the area of the rail that generates the levitation force is within a range that can withstand precision machining, the total surface area of the rail portion is small, and therefore the flying height can be reduced. In addition, since the central part has only a groove, the air flow is more stable than in the conventional case. Therefore, the shaking of the head is reduced, the head floats stably, and the L amount can be maintained.

[Example] Next, the magnetic head of the present invention will be described in more detail based on the drawings.

FIG. 1 is a perspective view of a magnetic head according to the present invention. The slider 1 is made of non-magnetic ceramic, and sight rails 2 for generating floating force are formed on both sides of the surface facing the recording medium. A notch is provided at the air outflow end of one of the sight rails 2.
A chip core 3 forming a recording/reproducing gap is inserted into the notch and fixed with a glass 4. The shape of the chip core 3 is, for example, as shown in FIGS. 2(a) and 2(b), and one in which one or both sides of the gap portion is cut off is usually used to narrow the track.

Regarding the slider in the present invention, for example, T!
Ca Oa, At 20a T! Non-magnetic ceramics such as C are suitable. 400μl as sight rail width
Precision machining was possible with no chipping in the areas where the process was applied.

A magnetic head having the above structure according to the present invention is used as a spring (gimbal).
Attached to a 5" diameter coated disc (peripheral speed 35 m/
When measuring the flying height for S), it was found that 400 of the conventional structure
0.0 when using a magnetic head on three μm-wide rails.
Compared to 48μ-, it was possible to set it as extremely small as 0.29μ. Furthermore, the stability during flying was significantly superior to that of conventional magnetic heads.

[Effects of the Invention] As described above, since the magnetic head of the present invention does not have a center rail at the center of the air bearing surface, the structure of the head is simplified.
Air flow becomes stable. Therefore, the flying height of the head is stabilized, and the head performance is also stabilized.

[Brief explanation of drawings]

FIG. 1 is a perspective view of the magnetic head of the present invention, FIG. 2 is a perspective view of a chip core, FIG. 3 is a perspective view of a magnetic head that is composed only of magnetic material and has a gap at the rear end of the center rail, and FIG. 4 1 is a diagram showing a magnetic head having a structure in which a chip core is embedded in the rear end of the center portion of a non-magnetic slider. '$ l @ Figure v-12 Figure 3 Figure 4 1985 Patent Application No. 40055 Title of the invention Relationship to the case involving a person who corrects a composite flying magnetic head Patent applicant address 2-1 Marunouchi, Chiyoda-ku, Tokyo Number 2 name (5
08) Hitachi Metals Co., Ltd. Representative Tsukeji Matsuno

Claims (1)

[Claims] In a floating magnetic head that performs recording and reproduction on a magnetic recording medium, two floating rail sections that generate floating force due to air flow are located on both sides of the medium facing surface of a nonmagnetic slider. A composite flying magnetic head characterized in that a notch is provided at one air outflow end, and a chip core is inserted into the notch.