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1. (WO1998000840) EXTREMITE DE TETE MAGNETIQUE A COUCHE MINCE ET SON PROCEDE DE FABRICATION
Note: Texte fondé sur des processus automatiques de reconnaissance optique de caractères. Seule la version PDF a une valeur juridique

THIN FILM MAGNETIC HEAD TIP AND
MANUFACTURING METHOD THEREFOR

Technical Field
The present invention relates to a thin film magnetic head tip of a videocassette recorder (VCR), used for recording/reproducing information onto/from a tape and a manufacturing method therefor.

Background Art
Generally, a VCR includes a head drum 2 as shown in FIG. 1 for diagonally scanning a magnetic tape 1 with respect to the traveling direction thereof in order to read information recorded on the traveling magnetic tape 1 or record new information onto the magnetic tape 1.
The head drum 2 includes a fixed drum 3 for guiding the magnetic tape 1. a rotary drum 4 rotatably installed on a shaft of the fixed drum 3 and a magnetic head 5 installed in the rotary drum 4. Also, as shown in FIG. 1, the magnetic head 5 includes a head base 6 and a magnetic head tip 7.
Referring to FIG. 2. the magnetic head tip 7 is manufactured by various processes. That is, cores 9 and 9' are manufactured separately and the spacing between the cores 9 and 9' is determined after lapping, bonding and assembly processes.
However, the above magnetic head tip 7 and the manufacturing method therefor are not desirable due to various errors and deviations caused during the various processes. Also, since the cores 9 and 9' should be formed of ferrite. it is difficult to minimize the size of the core 9 and 9'.
To solve this problem, in Korean Patent Application No. 95-2081. filed

Feb. 6. 1995. entitled "magnetic head and manufacturing method therefor" , there is described a magnetic layer which is selectively formed, so that a magnetic path is shortened, reducing inductance. Also, a separate manufacturing process for two cores is not required, improving yield.
However, the method for manufacturing the magnetic head includes various processing steps as before: the step of attaching a substrate member processed to have a predetermined azimuth angle to the uppermost layer of a stacked structure, the step of forming a window for winding, the step of machining one side of the magnetic head in a predetermined curvature in order to improve the contact to a tape, and the step of performing the winding.

Disclosure of the Invention
It is an object of the present invention to provide a thin film magnetic head tip and a manufacturing method therefor, which reduces the manufacturing steps of a magnetic head and makes possible the mass production of the magnetic head.

According to an aspect of the present invention, there is provided a thin film magnetic head tip comprising: a wafer being a non-magnetic insulator; a conductive contact point within a plurality of holes formed through the wafer; a base being a non-magnetic insulator, stacked on the wafer: a magnetic core being partially within the base, having an azimuth groove; and a coil within the base wound around the core, having two ends each connected to the conductive contact points.
According to another aspect of the present invention, there is provided a method for manufacturing a thin film magnetic head tip comprising the steps of: (a) forming a plurality of holes passing through a wafer; (b) filling the holes with a conductive material; (c) stacking a base being a non-magnetic insulator, a magnetic core having an azimuth groove, and a coil within the base around the magnetic core on the wafer in a predetermined shape by a wafer process; and (d) cutting the stacked wafer into thin film magnetic head tips.
In the thin film magnetic head tip and the manufacturing method therefor according to the present invention, the manual manufacturing steps for the magnetic head are reduced and the mass production of the magnetic head is achieved effectively.

Brief Description of the Drawings
FIG. 1 is a perspective view of a head drum for a videocassette recorder

(VCR);
FIG. 2 is a perspective view of the magnetic head tip of FIG. 1 ;

FIG. 3 is a partially cutaway perspective view of a wafer used for a thin film magnetic head tip according to the present invention;
FIG. 4 is a sectional view illustrating the step of stacking to form a thin film magnetic head tip of the present invention by a wafer process;
FIG. 5 is a perspective view of a wafer plate in which the thin film magnetic head tip of the present invention is formed by stacking;
FIG. 6 is a perspective view of the thin film magnetic head tip obtained by cutting the wafer plate of FIG. 5; and
FIG. 7 is a perspective view showing a step in which the thin film magnetic head tip of the present invention is attached to a head base.

Best mode for carrying out the Invention
A thin film magnetic head tip according to the present invention is manufactured by a well-known wafer process. As shown in FIG. 4, the wafer process is for sequentially stacking predetermined material onto a wafer 100 of

FIG. 3 using sputtering, deposition and photolithography processes.
As shown in FIGS. 3 and 7, holes formed through the wafer 100 used for the wafer process are filled with metal such as copper (Cu). One side of the metal is used as a contact point 210 when connecting a thin film magnetic head tip 200 to a head base 300. The other side of the metal is connected to a conductive coil

130 (see FIG. 4) which will be described later.
Referring to FIG. 4, a magnetic core 110, a base 120 being a non-magnetic insulator and a conductive coil 130 are stacked on the wafer 100 in a predetermined shape by deposition and photolithography methods.
The conductive coil 130 is formed within the base 120 around the magnetic core 110. and two ends of the conductive coil 130 are connected to two of the contact points 210 formed on the wafer 100. respectively. That is. the conductive coil 130 is stacked together with the base 120 and the magnetic core 110 while winding the magnetic core 1 10.
The magnetic core 110 is formed of iron (Fe) compounds or amorphous alloy containing cobalt (Co) having high magnetic permeability, high saturation magnetic flux densitv and less coercive force, and the base 120 being the non- magnetic insulator is a material having a thermal expansion coefficient which is similar to that of the material used for the magnetic core 110, and a strong antiabrasion property Also, the conductive coil 130 is formed of metal such as Cu having high conductivity
Referring to FIG 4, m the final step, an azimuth groove 140 and a curved surface 150 are formed atop the magnetic core 110 The azimuth groove 140 and the curved surface 150 are intentionally formed by deposition and photolithography processes The magnetic cores 110 are separated from each other by the azimuth groove 140, and the curved surface 150 contacts the magnetic tape 1 of FIG 1 When the curved surface 150 is formed by the deposition and photolithography methods, a staircase texture 151 is formed on the curved surface 150 as shown in the enlarged view of FIG 4 However, since the height of a staircase texture 151 is below several micrometers, the curved surface 150 is capable of smoothly contacting the magnetic tape 1 of FIG 1
As described above, a wafer plate 400 of FIG 5. manufactured by the wafer process is cut into a plurality of thin film magnetic head tips 200 of FIG 6 of a proper size by a cutter (not shown) The azimuth groove 140 is formed in the curved surface 150 formed on the thin film magnetic head tip 200 Even though the number of thin film magnetic head tips obtained from one wafer plate is dependent on the size of the water plate, several hundreds of thin film magnetic head tips 200 are obtained from one wafer plate in general
As described above, the thin film magnetic head tip 200 obtained by cutting the wafer plate manufactured by the wafer process is attached to the head base 300

Industrial Applicability
According to the thin film magnetic head tip and the manufacturing method therefoi . the number of manual pi cesses for manufacturing the magnetic head is reduced and the magnetic head can be effective!) produced by mass production In particular, the manufacturing process is simplified since additional processes for forming the curved surface contacting the magnetic tape are not required