JPH01290106A - Core holder of magnetic head - Google Patents

Abstract

PURPOSE:To simplify the mounting process of a magnetic core on a core holder by forming the core holder with resin, and providing a groove part to perform the positioning of the magnetic core by press fitting. CONSTITUTION:The core holder 14 is a resin molded product formed in almost flat plate shape nearer to a rectangle, and the groove part 16 is provided at the regular position of the core holder 14, and the width of the groove part 16 is formed larger than that of the magnetic cores 12 and 13. Furthermore, four projections 2 formed in semicylindrical shape are provided on the wall on one side of the groove part 16, and the width from the projections 2 to the wall on the side opposite to the groove part 16 is narrowed than that of the magnetic cores 12 and 13. When the press fitting is performed from the bottom plane parts of the magnetic cores 12 and 13 to the groove part 16, press-fitted magnetic cores 12 and 13 are pressed by the projections 2. In such a way, it is possible to perform the positioning of the magnetic core on the wall on the opposite side of the groove part 16 where no projection 2 exists, and to perform press fitting work easily.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a core holder for holding the core of a magnetic head.

BACKGROUND OF THE INVENTION In recent years, as the prices of various components have decreased, there has been a demand for magnetic heads that are low in price and of excellent quality.

In this type of magnetic head, a magnetic head in which a magnetic core made of a plurality of laminated thin plates of high permeability magnetic material is assembled into a metal core holder is widely used. The conventional structure of such a magnetic head will be explained below with reference to FIG. FIG. 3 is an assembled diagram of a conventional magnetic head.

(a) is a side view and (b) is a plan view. Here 1
is a core holder and is made of metal. 4.5 is a magnetic core, and 8 is a coil bobbin. The magnetic core 4 is adhered to the core holder 1, and the magnetic core 5 is joined to the magnetic core 4 with the coil bobbin 8 in between. The joint surface between the magnetic core 4 and the magnetic core 5 becomes a gap for audio. Similarly, 6.7 is a magnetic core, 9 is a coil bobbin, and the joint surface between the magnetic cores 6 and 7 becomes a gap for control signals.

Of these, a perspective view of the core holder 1 and the magnetic core 4.6 is shown in FIG. 4(a). The core holder 1 has a nearly rectangular flat plate shape and is made of metal. Alternatively, as shown in FIG. 4(b), the core holder 1 may be provided with a protrusion 11 for temporarily positioning the magnetic core 4.6. That is, the bottom side of the magnetic core 4.6 is fixed in a prescribed position of the core holder 1 with a jig, and both sides of the bottom side of the magnetic core 4.6 are bonded with adhesive 10.

Problems to be Solved by the Invention However, in this case, it is not possible to position the magnetic core at a specified position because the dimension between the protrusions for fixing the magnetic core is equal to or larger than the width of the magnetic core. Therefore, a positioning process was required. In addition, since the resin is bonded after positioning, if an opening force is applied until the resin hardens, the magnetic core may move in the direction along the groove or in the width direction of the protrusion, and even after hardening, the position may shift due to external force. The position of the magnetic core lacked stability.

Means for Solving the Problems In order to solve this problem, the present invention includes a core holder made of resin and a groove portion for positioning the magnetic core by press-fitting.

According to the present invention, with this configuration, the magnetic core can be positioned at a prescribed position by press-fitting, and the position of the press-fitted magnetic core can be fixed at a regular position. There is no need for subsequent positioning steps or resin bonding. Also, since it is a resin molded product, the shape after press-fitting can be easily created.

EXAMPLE Hereinafter, an example of the present invention will be described in detail with reference to the drawings.

FIG. 1 shows a perspective view of the core holder and core.

Here, 12.13 is a magnetic core, which corresponds to the magnetic core 4.6 described in the prior art. 14 is a core holder; 3 is a protrusion for ensuring positional accuracy of the magnetic cores 12 and 13; 15 is a groove for giving springiness to the protrusion 3;
6 is a groove portion for holding the magnetic core 12.13. The magnetic cores 12 and 13 have a straight bottom and a rod-like shape extending diagonally upward to the right. The core holder 14 is a resin molded product having a flat plate shape close to a rectangle.

A groove 16 is provided at a prescribed position on the core holder 14. The width of this groove 16 is made wider than the width of the magnetic core 12.13. Furthermore, four semi-cylindrical projections 2 are provided on one side wall of the groove 16. The width from this protrusion 2 to the opposite wall of the groove 16 is the width of the magnetic core 12.
．． It is narrower than the width of 13. The magnetic core 12.13 is press-fitted into the groove 16 configured in this way from the bottom surface.

The press-fitted magnetic cores 12 and 13 are pushed by the protrusions 2, so that they can be properly positioned on the wall on the opposite side of the groove 16 where the protrusions 2 are not present. Note that the groove portion 15 is in the same direction as the groove portion 16 and has a rectangular shape smaller than the groove portion 16. The groove portion 16 provided in this manner allows the wall on which the protrusion 2 is located to have spring properties, which prevents damage to the core holder 14 and at the same time facilitates press-fitting work.

Note that the protrusion 2 is semi-cylindrical, but as shown in Fig. 2(a)
, as shown in (b) and (c) (the upper part of the protrusion 2 is rounded,
The embodiments of the present invention will not be hindered even if it is made into a C-plane shape, a tapered shape, or a prismatic shape. Further, the number of protrusions 2 is not limited to four, two each.

Effects of the invention As stated above (according to the present invention, the core holder is made of resin, and the magnetic core is press-fitted into the groove formed in the core holder, so that the magnetic core can be fixed. The installation process can be simplified.In other words, there is no need to use a jig to position the magnetic core with respect to the core holder or to fix it with resin.
It has the effect of becoming.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing the relationship between a core holder and a core according to an embodiment of the present invention, FIG. 2 is a perspective view showing an example of a protrusion,
FIG. 3 is an assembled view for explaining the conventional technique, and FIG. 4 is a perspective view for explaining the conventional technique. 2...Protrusions 12.13...Magnetic core 14...Core holder 15.16...Name of attorney Mizobe Patent attorney Toshio Nakao and one other person Figure 1 Figure 2 Figure 3 Figure 4

Claims (1)

[Claims] A core holder for a magnetic head that holds a core of a magnetic head, the core holder being made of resin and having a press-fit groove for press-fitting the core, and a protrusion formed in the press-fit groove. .