JP2553497B2 - Method of manufacturing magnetic head - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of manufacturing a magnetic head used in a magnetic disk device or a magnetic drum device.

2. Description of the Related Art Conventionally, as a method for forming a gap in a ferrite core for a floating magnetic head, as disclosed in JP-A-50-44812, a glass frit is settled on at least one gap surface of a pair of ferrite cores by centrifugation. After that, the glass film pressure is adjusted by baking and wrapping tape, and after the two cores are superposed, the adhesive glass is inserted and the whole is pressurized and heated to melt the gap glass and the adhesive glass to form a predetermined magnetic gap. As shown in JP-A-39-28376, a spacer is positioned between a pair of ferrite cores, the two cores are superposed, adhesive glass is inserted, and the whole is pressurized and heated. There was a method to make the gap with the permeated adhesive glass.

Problems to be Solved by the Invention However, the former method has a low adhesive strength, and it is difficult to mass-produce the magnetic gap with high accuracy in both of them, and the core with a narrow gap is more difficult.

The present invention is intended to eliminate the above-mentioned conventional drawbacks.
An object of the present invention is to provide a method of manufacturing a magnetic head, which can surely increase the bonding strength between the slider and the core while simplifying the process while preventing the accuracy of the front gap from deteriorating.

Means for Solving the Problems The present invention provides a front gap surface and a back gap surface by forming first and second grooves in a first core, thereby providing a first core and a second core. The first gap between the front gap surface and the second core via a sputtered film,
And the first glass in the second groove and the first glass at a predetermined temperature.
Second glass having a viscosity lower than that of the first glass is softened to soften the first and second glasses, and the softened glass obtained by softening the first glass is near the front gap surface in the first groove. The softened glass that is adhered to the second glass and further softened the second glass is poured between the back gap surface and the second core to bond the first and second cores.

Operation With the above configuration, the front gap can be formed with high accuracy, and molten glass having high bonding strength can be provided in the vicinity of the back gap and the front gap.

Example An example of the present invention will be described below using a floating magnetic head.

As shown in FIG. 1, a glass thin film 8 of quartz glass, borosilicate glass, lead glass or the like is attached to the front gap surface 5 constituting the magnetic gap of at least one core 1 constituting the magnetic head by sputtering, and further, A glass insertion groove 3 and a winding groove 9 serving as a winding window are provided on the back gap surface 4 of at least one of the cores. After that, the two cores 1 and 2 are overlapped, for example, the second core
The front adhesive glass 7 and the back glass 6, which are lower in working temperature than the sputter glass 8, are pressed into the winding groove 9 and the insertion groove 3, respectively, as shown in FIG. At the same time, the adhesive glass 7 is placed near the front gap of the winding groove 9 and heated to a temperature of 600 to 800 ° C. in an electric furnace. At that time, since the back glass 6 must completely penetrate into the back gap, it is preferable that the back glass 6 has a low viscosity of 10 ² to 10 ³ poise, and the front adhesive glass 7 penetrates into the gap between the sputtered glass 8 and the core 1. In order to prevent the reaction with the sputtered glass 8, it is preferable that the viscosity is about 10 ⁴ poise. Both the front adhesive glass 7 and the back glass 6 must not react with the core at a temperature of 600 to 800 ° C. By holding the temperature at 600 to 800 ° C. for 1 to 2 hours, the melted back glass 6 flows into the back gap surface 4, and the further melted adhesive glass 7 adheres to the vicinity of the front gap surface 5 in the winding groove 9. Then, by cooling it, core 1 and core 2 are integrated, and
After cutting as shown in the figure, a monolithic type floating magnetic head as shown in FIG. 4 is obtained through a grinding process. When the magnetic gap length becomes a narrow gap of 0.5 μ or less, the back gap distance becomes 0 due to the deformation of the core, and the back glass does not flow stably. In such a case, as shown in FIG. At the same time when the glass thin film 8 is formed in the front magnetic gap by sputtering, a thin film 8'can be formed on a part of the back gap surface by sputtering to stabilize the back gap and flow the back glass. As described above, in this embodiment, the molten adhesive glass 7 is adhered to the vicinity of the front gap surface 5, and the molten glass is poured into the back gap surface 4, so that the joint strength between the cores 1 and 2 is improved. In addition, since the front gap surface 8 is further provided with the sputtered film, the gap accuracy does not deteriorate. Also, the viscosity of the back glass 6 at 600 ° C to 800 ° C is about 10 ² to 10 ³ poise, and the viscosity of the adhesive glass 7 at 600 ° C to 800 ° C is
By making the viscosity of the back glass 6 at a predetermined temperature lower than the viscosity of the adhesive glass 7 such as about 10 ⁴ poise, the melted back glass 6 can be surely poured into the back gap surface 8, so Different cores can be joined together.

Effect of the Invention As described above, the present invention provides the first core with the first and second cores.
By forming the groove of 1), the front gap surface and the back gap surface are provided, and the first core and the second core are butted to each other between the front gap surface and the second core via the sputtered film, The first glass and the second glass having a lower viscosity than the first glass at a predetermined temperature are inserted into the second groove, respectively, and the first and second glasses are softened to form the first glass. Softened glass is the first
It is attached near the front gap surface in the groove of the
The softened glass obtained by softening the above glass is poured between the back gap surface and the second core to bond the first and second cores, whereby a magnetic head with high bonding strength can be obtained and the magnetic gap It is possible to provide a manufacturing method which is highly accurate and can be mass-produced and which is significantly superior to the conventional manufacturing method.

[Brief description of drawings]

1 to 4 sequentially show an example of the manufacturing method of the present invention, and FIG. 1 is a perspective view showing a state where a core half body having a film formed by sputtering is brought into contact with another core half body. FIG. 2 is a side view showing a gap forming jig, FIG. 3 is a perspective view after heat treatment for forming a gap, FIG. 4 is a perspective view showing a completed state of a floating magnetic head after processing, and FIG. It is a perspective view showing a part of process of other examples of the invention. 1,2 …… Core (first and second core) 3 …… Insertion groove (second groove) 4 …… Back gap surface 5 …… Front gap surface 6 …… Back glass (second glass) 7 ... Adhesive glass (first glass) 8 ... Sputtered film 9 ... Winding groove (first groove)

 ─────────────────────────────────────────────────── --- Continuation of the front page (56) Reference JP-A-54-159211 (JP, A) JP-A-59-107414 (JP, A) JP-A-60-85406 (JP, A) JP-A-59- 107412 (JP, A)

Claims (1)

(57) [Claims] Claim: What is claimed is: 1. A first core is formed on a joint surface between the first core and the second core.
And a second groove to form a back gap surface between the first groove and the second groove, and a front side of the first groove opposite to the side where the back gap surface is provided. A gap surface is formed, and then the first and second grooves are opposed to the second core, respectively, and the first gap is formed between the front gap surface and the second core via a sputtered film. Butt the core and the second core, insert the first glass and the second glass having a lower viscosity than the first glass at a predetermined temperature into the first and second grooves, respectively, and The first and second glasses are softened, and the softened glass obtained by softening the first glass is attached to the vicinity of the front gap surface in the first groove,
Furthermore, the softened glass obtained by softening the second glass is poured between the back gap surface and the second core to bond the first and second cores together.