JPS599408Y2 - magnetic head - Google Patents

Description

[Detailed explanation of the idea] The present invention relates to an assembly structure of a ring-shaped magnetic head.

Conventionally, ring-shaped magnetic heads have a U-shaped (actually, the U-shaped is shallow so it can be considered a C-shaped, but we will call it U-shaped here for simplicity) core with a wire wound on it and bonded to a holder with resin. Two sets of objects are butted together with a gap spacer at one end, and screws are inserted into both holders and tightened, and then stored in a shield case, with a leaf spring interposed between the case and the holder. Although resin was injected into the magnetic head, the screw tightening torque tends to cause the head gap to shift in the direction of stress, which has the disadvantage of causing deterioration in the characteristics of the magnetic head.

The purpose of this invention is to tighten the holder by using a spring key in addition to screws.
The object of the present invention is to provide a ring-shaped magnetic head that does not have the above-mentioned drawbacks.

This will be explained below with reference to the drawings.

FIG. 1 is a side view showing an intermediate assembly of a conventional magnetic head, in which a core 1 is wrapped with insulating tape and a winding 2 is attached, and the core 1 is bonded to a holder 3 using resin or the like. Two combinations are butted against each other.

At this time, the abutting surfaces are surface ground and a gap spacer 4 made of titanium foil or the like is inserted to define the head gap.

Further, both holders 3 and 3 are butted together and tightened with screws 5.

FIG. 2 shows the intermediate assembly shown in FIG. 1 further housed in a shield case 6, with a leaf spring 7 placed between the inner wall surface of the shield case 6 and the outer wall surface of the holder 3. The holder 3 is inserted and used for positioning within the case 6 at the same time as tightening the holder 3.

Further, resin is injected into the shield case 6, and the head gap and the outward facing surface in the vicinity thereof are polished to form a rounded surface to complete the magnetic head.

However, such conventional ring-shaped magnetic heads are subject to repeated temperature changes, external vibrations and shocks, and over many years, the head gap tends to shift in the direction of the screw tightening torque. There is a phenomenon in which the characteristics of the magnetic head deteriorate due to deviation or deviation in the core.

FIG. 3 is a perspective view showing an intermediate assembly of the magnetic head according to the present invention, in which a spring key 8 is further inserted between the holders 3 and 3 as a bridge.

As shown in FIG. 4, the spring key 8 has a cylindrical shape with a cut 9 along its entire length in the axial direction, and is a component made of a resilient material.

At least two spring keys 8 are used for one magnetic head.

For example, a magnetic head with a butting part width of 7 mm and a holder spacing of 10 mm has an outer diameter of 1.5 mm.
Apply the two spring keys 8.

A through hole with a diameter slightly smaller than that of the spring key 8 is formed in the holders 3, 3, and both ends of the spring key 8 are fitted into the through hole.

In this way, the function of the through-post can be obtained and the occurrence of misalignment at the abutting portion can be prevented.

In addition, if both ends of spring key 8 are slightly deflated,
The attachment work to the holders 3, 3 becomes easier.

As explained above using the embodiments, according to the present invention, in addition to screws, at least two spring keys of simple structure are used.
By using this together, it is possible to obtain an extremely reliable ring-shaped magnetic head that can withstand temperature changes, vibrations, shocks, etc.

Although it is possible to omit the leaf spring 7 shown in FIG. 2, it is preferable to include it for positioning within the shield case.

[Brief explanation of drawings]

FIG. 1 is a side view showing an intermediate assembly of a conventional magnetic head;
Figure 2 is a side view showing a complete conventional magnetic head;
The figure is a perspective view showing an intermediate assembly used in an embodiment of the magnetic head according to the present invention, and FIG. 4 is a perspective view of an example of a spring key used in the present invention. 1...Core, 2...Winding, 3...
...Holder, 4...Void spacer, 5...
...Screw, 6.Curved case, 7..Leaf spring, 8..Spring key 9.Curve, cut.

Claims (1)

[Scope of utility model registration request] In a ring-shaped magnetic head formed by combining two holders with cores attached to form a head gap between the cores, the holders are tightened and fixed using screws, and each of the holders is A ring-shaped magnetic head characterized in that the spring key is supported as a bridge between the holders by fitting both ends of a spring key having a diameter larger than the through hole into a shaped through hole.