JPS6361404A - Gap forming jig - Google Patents

Abstract

PURPOSE:To improve a yield, by using a gap forming jig provided with a pressurizing bar having a function not to be moved in a circumferential direction, but to be moved only in an axial direction, and a pressurizing force holding means to fix the pressurizing bar keeping it in a pressurized state. CONSTITUTION:The titled jig is formed by a gap forming core holding main body 1, magnetic head cores 21 and 22 to form a gap, a pressing plate 2, a flat spring 3, the pressurizing bar 4 to pressurize the flat spring 3, a pressurizing force holding part 5, and a bonding glass 23 to bond the magnetic head cores 21 and 22. A gap forming process is performed in such a way that the mutual positions of the magnetic head cores 21 and 22 are decided, and prescribed pressure is applied on the pressurizing bar 4 by a pressurizing force measuring instrument outside a jig, and resiliency is generated in the flat spring 3 being deformed by the above pressurization, and the magnetic head cores 21 and 22 continue to be pressurized through the pressing plate 2. At this time, since no movement of the pressurizing bar 4 in the circumferential direction is generated, the dislocation of the magnetic head core is prevented. Also, heating for 30min at 480 deg.C in an electric furnace is applied to bond the magnetic head cores 21 and 22 with molten glass, then, annealing is applied.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a gap forming jig used for abutting the gap forming surfaces of a pair of magnetic hemlock cores to form a magnetic gear between the two surfaces.

Conventional technology Gap formation for magnetic heads involves determining the mutual positions of the magnetic head cores, applying pressure to bring the head core gear knob forming surfaces into close contact, and bonding the cores with glass molten at high temperature. , to be fixed. Gap forming jigs have traditionally been used for this purpose.

An example of a conventional gap forming jig is shown in Figure 2 (al, tb).
It is shown and explained in 1. In Fig. 2, 1 is a gear knob forming core holding body, 2 is a pressing plate, 3 is a plate spring, 14 is a pressure screw for pressurizing a temporary spring, 21 and 22 are magnetic head cores to be used to form a gear knob, and 23 is a magnetic head. Bonding glass for bonding head cores together.

The gap forming process will be explained. Magnetic head core 21.2
After determining the mutual positions of the springs 2 and 2, pressure is applied to the temporary spring 3 by the pressure screw 14 to deform the spring 3. The anti-In force of the leaf spring 3 due to deformation is applied to the magnetic head core 2 via the pressing plate 2.
1.22, and both magnetic head cores 21.22 are brought into close contact with the gear knob surfaces. Generally, a glass material is used to secure the gap space and to reinforce the gap. Therefore, the gap forming jig 15 including the magnetic head core is heated in an electric furnace or the like to melt the bonding glass 23 and the magnetic head core 21 is heated. and 22 are bonded together to obtain the desired gap length.

Problems to be Solved by the Invention In the gap forming jig described above, after the mutual positions of the magnetic nodal cores 2I and 22 are determined, pressure is applied by the pressure screw 4. At this time, since the pressure screw 4 generates rotational force when pressurized, there is a problem in that the magnetic head core 22 and 230 are misaligned with each other, resulting in a defective product.

In addition, in narrow gap heads such as those used for videos, although the magnitude of the pressurizing force is a major factor that affects the gap length accuracy, the pressurizing force is managed by the amount of screw penetration, and numerical values are used. It was not stable, and there was a problem with the gap length yield.

Means for Solving the Problems The technical means of the present invention for solving the above-mentioned problems is to provide the above-mentioned pressure rod with a function of moving only in the axial direction and not in the circumferential direction. The purpose of the present invention is to use a gap forming jig equipped with a pressurizing force holding means that is fixed in a pressurized state.

Effect: By preventing the pressure rod from moving in the circumferential direction, it is possible to suppress misalignment of the magnetic head cores with respect to each other. Furthermore, by providing a pressure holding portion that moves the pressure rod in the axial direction and fixes it in a pressurized state, it is possible to apply a stable pressure using a pressure measuring device outside the jig.

EXAMPLE Hereinafter, an example of the present invention will be described based on the drawings. Fig. 1 (in al, +bl, l is the gap forming core holding body, 21.22 is the magnetic nodal core that attempts to form the gap, 2 is the pressing plate, 3 is the temporary spring, and 4 is the pressure that presses the temporary spring) The rod 5 is a pressure holding part, and the numeral 23 is a bonding glass for bonding the magnetic head cores 21 and 22.

In the gap forming step, the mutual positions of the magnetic nodal cores 21 and 22 are determined, and a predetermined pressure is applied to the pressurizing rod 4 using a pressurizing force measuring device outside the jig. The leaf spring 3 deformed by the pressing rod 4 generates a repulsive force and continues to press the throat cores 21 and 22 through the pressing plate 2 magnetically. At this time, pressure rod 4
Since there is no movement in the circumferential direction, the magnetic throat core will not shift. In order to bond the magnetic cores 21 and 22 with the glass melted in the glass, it was heated at 480℃ for 30 minutes in an electric furnace.
After heating and maintaining for a minute, slowly cool the mixture. Figure 3.

FIG. 4 shows the mutual positional deviation of the magnetic core and the average gap length of the magnetic core and the magnetic core when gap formation is performed in 10 sets each using the conventional method and the method of an embodiment of the present invention. be.

In Figure 3, the smaller the amount of deviation, the better, and in Figure 4, the target value is 0.
．． It is 3 μm. It can be seen that one embodiment is better than the conventional example in both FIGS. 3 and 4.

Effects of the Invention The present invention provides a gap forming system that includes a pressurizing rod having a function of moving only in the axial direction without moving in the circumferential direction, and a pressurizing force holding means that fixes the pressurizing rod in a pressurized state. By using the jig, it is possible to improve the yield by suppressing the mutual positional deviation of the magnetic head cores, and it is possible to improve the gap length accuracy by stabilizing the pressing force.

[Brief explanation of the drawing]

FIG. 1 (al, (1)) is a front view and a plan view of a gap forming jig when a magnetic head core is mounted to form a gap according to an embodiment of the present invention, and FIG.
t, (bl is a front view and a plan view of a gear tooth forming jig when a magnetic core is attached to form a conventional gear tooth, and FIGS. 3 and 4 are a diagram of a conventional method and an embodiment of the present invention. It is a graph showing the mutual positional deviation of the magnetic nodal cores and the average gap length of the magnetic nodal cores when gear//p formation is performed in 10 sets by the method. !... Gap forming core holding body, 2...
... Pressing plate, 3 ... Temporary spring, 4 ... Pressure rod, 5 ... Pressure holding part, 14 ...
Pressure screw, 21... To magnetic, dokoa, 22...
...magnetic core, 23...bonding glass. Name of agent: Patent attorney Toshio Nakao
Figure 2

Claims (1)

[Claims] A gap forming jig used for forming a gap between a pair of magnetic head cores facing each other so that their gap forming surfaces face each other in a predetermined mutual positional relationship, the jig comprising: A pressurizing rod that has a function of moving only in the axial direction without moving in the axial direction, and presses the two magnetic head cores in a direction toward each other, and a pressurizing force holding part that fixes the pressurizing rod in a pressurized state. A gap forming jig characterized by: