JPH0294008A - Manufacture of magnetic head - Google Patents

Abstract

PURPOSE:To minimize the clearance of the bonding surface of a back core and the leg of a magnetic head core chip by magnetizing the leg of the magnetic head core chip, and after the back core is attracted and temporarily fixed, bonding it. CONSTITUTION:When a magnetic head core chip 2 is attracted to permanent magnets 20 and 21 on a base 22 composed of a non-magnetic body, legs 2a and 2b of the magnetic head core chip 2 composed of a ferromagnetic body are magnetized and for example, a leg 2a generates the magnetism of an N pole and 2b generates the magnetism of an S pole. When a back core 5 composed of the ferromagnetic body is provided so as to bridge the legs 2a and 2b of the core chip, a magnetic attraction force functions between the back core and the legs 2a and 2b of the magnetic head core chip, strongly pull together and join. Between the back core 5 temporarily fixed by the attraction force and the legs 2a and 2b, adhesives 7 are poured and bonded and thus, the satisfactory bonding is obtained.

Description

[Detailed description of the invention]! -1 The present invention relates to a method of manufacturing a magnetic head used in an FDD device, etc., and particularly relates to a method of bonding a back core for closing a magnetic path.

The back core bonding process for a conventional FDD head will be described below.

First, as shown in FIG. 4, the FDD head 1 has a pair of sliders A 3 a + slider B 3 b made of ceramics bonded to both sides of a magnetic hent core chip 2, and a pair of sliders A 3 a + slider B 3 b made of ceramics are bonded to the recording medium to a desired gap depth d. The sliding surface S is polished and further smoothed.

After inserting the coil 4 into at least one leg 2a of the magnetic core chip 2 to which the slider A3a and slider B3b are attached, the back core 5 is inserted into the leg 2a of the core chip.

2b is arranged to bridge the spring 6, and the spring 6 is connected to the slider A3a.
and the bank core 5 so as to press them together and temporarily fix them, and then pour the adhesive 7 onto the back core 5 and the legs 2a and 2b of the magnetic hent core chip to fix and adhere them (FIGS. 5 and 6).

By the way, as mentioned above, if you try to fix the back core 5 with the spring 6, the spring 6 will be very small (workability will be very poor), and if the spring 6 is too strong, it will become magnetic and the legs 2a, 2b of the back core chip If the spring is broken, or if the spring is too weak, the gap between the joints becomes large and the magnetic resistance increases.Therefore, there is a large variation in characteristics depending on the strength of the spring.

6. The present invention was proposed in view of the above problem, and the technical means for solving this problem is to magnetize the legs of a magnetic head core chip made of a ferromagnetic material with a gap formed,
The feature is that the back core is attracted and temporarily fixed by magnetic force and then bonded.

1. According to the present invention, the legs of the tocoa chip are magnetized,
By attracting and adhering the back core using magnetic force, the gap between the adhesion surfaces of the back core and the legs of the magnetic hendo core chip becomes smaller, and good adhesion can be obtained.

An embodiment of back core adhesion according to the present invention will be described below with reference to FIGS. 1 to 3.

In FIGS. 1 to 3, reference numeral 20 and 21 denote permanent magnets serving as magnetism generating means, which are magnetized so that the magnetic properties of opposing inner surfaces are reversed. 22 is a base made of non-magnetic material.

1. When the magnetic head core chip 2 is attracted to the permanent magnets 20 and 21, the legs 2a and 2b of the magnetic head core chip 2 made of ferromagnetic material are magnetized.
If a has north-pole magnetism, the leg 2b of the core chip on the opposite side will have south-pole magnetism. When the back core 5 made of ferromagnetic material is installed so as to bridge the legs 2a and 2b of this core chip, a magnetic attraction force will work between the back core 5 and the legs 2a and 2b of the magnetic head core chip, and they will strongly attract each other and join together. shall be. The bank core 5 and the legs 2a, 2 of the magnetic head core chip are temporarily fixed by this magnetic attraction force.
Adhesive 7 is poured into the space between b and bonded.

In the above embodiment, two legs of the permanent magnets 20 and 21 were used, but as shown in FIG. You may.

In addition, the magnetism generating means 20, 21. ' 23 is not limited to a permanent magnet, but may be an electromagnet or the like that can be controlled by turning on and off electricity.

As explained above, the present invention magnetizes the legs of the magnetic hentokoa chip using a magnetic generating means, and temporarily fixes the banokoa by attraction with the magnetic force, thereby creating an adhesive surface between the back core and the legs of the magnetic hentokoa chip. The gap is small, magnetic resistance is small, and better electromagnetic conversion characteristics with less loss can be obtained, and the workability is improved and the number of man-hours can be reduced.

FIG. 4 is a perspective view showing an FDD head, FIG. 5 is a plan view showing a conventional FDD head manufacturing method, and FIG.
It is a longitudinal cross-sectional view along the BB line of a figure.

[Brief explanation of the drawing]

FIG. 1 is a plan view of an FDD head for explaining an embodiment of the method for attaching a core chip and a back core according to the present invention, and FIG. 2 is a longitudinal cross-sectional view taken along line A-A in FIG. 1. It is. FIG. 3 is a sectional view showing another embodiment.

Claims (1)

[Claims] In the step of bridging and adhering a back core made of a ferromagnetic material to the leg of a magnetic head core chip made of a ferromagnetic material in which a magnetic gap is formed, the leg of the core chip to which the back core is attached is magnetized. 1. A method of manufacturing a magnetic head, which comprises temporarily fixing the magnetic head to each other by attraction, and then bonding the head with an adhesive.