JPS62172514A - Magnetic head - Google Patents

Abstract

PURPOSE:To eliminate the defective assembling by providing left/right spacers whose upper part is connected by a link part, providing a spacer provided with a fitting recess to the link and a shield plate formed with a fitting projection fitted to the fitting recess to the upper end. CONSTITUTION:A shield plate 30 made of a magnetic material is provided between plural magnetic head units 2 and 3 to apply magnetic shield between the magnetic head units 2, 3 as the magnetic head. The left/right spacers 31a, 31b whose upper end is linked by a link part 31c, a spacer 31 formed with a fitting recess 31d at the link 31c and a shield plate 30 formed with a fitting projection 30a fitted to the fitting recess 31d at the upper end are provided. Then the fitting recess 31d of the spacer 31 and the fitting projection 30 of the shield plate 30 are fitted to form the shield assembly 32 and the shield assembly 32 is fitted between the magnetic head units 2, 3.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a magnetic head, and more particularly to a multi-channel magnetic head in which a plurality of magnetic head units are magnetically shielded.

[Conventional technology]

A multichannel magnetic head is formed by accurately positioning and densely incorporating many small members, such as shield plates for magnetically shielding between magnetic head units, within a relatively small shield case.

FIGS. 5(a) to (dl) are a front view and a side view showing a spacer of a shield assembly that magnetically shields between each magnetic head unit in a conventional magnetic head, and FIGS. 6(a) to (b) are ) are a side view and a front view of the central shield plate.

As can be seen from these figures, a pair of spacers 51 and 52 are used in the conventional magnetic head.
A shield assembly is assembled so that the center shield plate 61 is sandwiched between these spacers 51 and 52 to maintain the distance between the magnetic head units.

[Problem that the invention seeks to solve]

In the conventional magnetic head described above, the spacers were installed and fixed one by one during the assembly work of the multi-channel magnetic head unit, which made assembly and positioning of the spacers difficult, and the spacers sometimes shifted from their designated positions or sank. Therefore, there was a problem that assembly failures were likely to occur.

Furthermore, there is a problem in that skill is required to assemble the spacer, resulting in poor work efficiency.

SUMMARY OF THE INVENTION In view of the above-mentioned problems, an object of the present invention is to provide a magnetic head in which the spacer of a shield assembly can be reliably positioned to facilitate assembly work.

[Means for solving problems]

The magnetic head of the present invention is a magnetic head in which a shield plate made of a magnetic material is arranged between a plurality of magnetic head units to magnetically shield each magnetic head unit, and the left and right spacers are connected at their upper ends by a connecting part. The shield plate includes a spacer having a portion and a fitting opening formed in the connecting portion, and a shield plate having an upper end portion formed with a fitting convex portion that fits into the fitting recess.

[Effect]

In the magnetic head of the present invention, the fitting concave portion of the spacer and the fitting convex portion of the shield plate are fitted to form a shield assembly, and this shield assembly is inserted between each magnetic head unit.

〔Example〕

Hereinafter, the present invention will be explained with reference to the drawings.

FIG. 1 is a sectional view of a magnetic head showing an embodiment of the present invention. The magnetic head of this embodiment is used, for example, as an auto-reverse magnetic head of a cassette tape recorder, and is housed in a shield case 1, with a forward magnetic head unit 2 and a reverse magnetic head unit 3. Equipped with.

The magnetic head unit 2 has a magnetic core 4 constituting a left channel magnetic head unit and a magnetic core 6 constituting a right channel magnetic head unit.

The magnetic head unit 3 similarly has a magnetic core 5 constituting a left channel magnetic head unit and a magnetic core 7 constituting a right channel magnetic head unit.

Each magnetic core 4 to 7 is made of a high permeability magnetic metal M! It is of a layered type (lamination type), and one end of each magnetic core 4 to 7 is exposed from an opening formed on the upper side of the shield case 1 in the figure to form magnetic pole faces 4a to 7a. Each of the magnetic pole surfaces 43 to 7a is formed on the same surface and constitutes a magnetic tape sliding surface 8 on which the magnetic tape slides.

Each magnetic core 4 extends in the opposite direction to the magnetic tape sliding contact surface 8
Coil bobbins 14 to 17 are attached to the other ends of the coil bobbins 14 to 17, respectively, and a coil is wound around each coil bobbin 14 to 17. Lead wires from each coil are connected to terminals 24 to 27 fixed to the terminal plate 9, respectively, and guided to the outside.

Between the magnetic core 6 of the forward magnetic head unit 2 and the magnetic core 5 of the reverse magnetic head unit 3,
For example, a central shield plate 30 made of a laminate of magnetic metal such as permalloy is provided.

Nakamoto Pano I and V1pox? n1. It is arranged so as to form the same surface as the sliding contact surface 8, and the other end on the opposite side extends downward until it contacts the terminal plate 9, thereby Magnetic Core 6.5 questions and these Magnetic Core 6.
Magnetic shielding is provided between the coils wound around 5.

As shown in FIGS. 4A and 4B, the central shield plate 30 is composed of a substantially rectangular plate member with one corner missing, and has a fitting protrusion 30a at its upper end. It is installed protrudingly.

A non-magnetic elastic member is provided at the upper end of the central shield plate 30 close to the magnetic tape sliding surface 8 to form a predetermined distance between the central shield plate 30 and the opposing magnetic cores 6.5. The spacer 31 is the central shield plate 30.
It is provided to sandwich and partially cover the

As shown in FIGS. 3(a) and 3(b), the spacer 31 is a left and right spacer portion 31a having a "<"-shaped cross section.

31b, and a connecting portion 31c that connects the upper ends of these spacer portions 31a and 31b.
1C is provided with a fitting recess 31d for fitting the fitting convex portion 30a of the central shield plate 30 and attaching the spacer 31 to the central shield plate 30.

The central shield plate 30 and the spacer 31 are fitted into the convex portion 30a.
By combining with the fitting recess 31 (i), the second
A central shield assembly 32 is formed as shown in Figures (al and bl).

Further, shield plates 33 and 34 made of magnetic metal are similarly arranged between magnetic cores 4 and 6 and between magnetic cores 5 and 7, and non-conductive plates 33 and 34 are respectively disposed on both sides of these shield plates 33 and 34. Magnetic metal is disposed in a sandwich pattern to form side shield assemblies 35,36.

To assemble the magnetic head of this embodiment configured as described above, first, the fitting concave portion 31d of the spacer 31 is fitted into the fitting convex portion 30a of the central shield plate 30, and then As shown in (b), a central shield assembly 32 is formed by assembling the central shield plate 30 and the spacer 31.

At the same time or at an earlier stage, a side shield assembly 35 is sandwiched between the 611 cores 4 and 6 to form the magnetic head unit 2, as shown in FIG. A side shield assembly 36 is sandwiched between the magnetic cores 5 and 7 to form the magnetic head unit 3.

Subsequently, the central shield assembly 32 is sandwiched between the magnets 2 and 3, assembled into the shield case 1, and positioned, and then the synthetic resin 11 is injected between each positioned member and solidified. and fix it. As a result, a half-rest of the magnetic head as shown in FIG. 1 is obtained.

Next, the exposed surfaces of the magnetic head halves assembled as shown in FIG. 1 are polished, and the two magnetic head halves are joined by abutting the polished surfaces to complete the magnetic head.

〔Effect of the invention〕

As described above, according to the present invention, the spacer has an upper end connected by a connecting portion and a fitting recess formed in the connecting portion, and a fitting protrusion that fits into the fitting recess at the upper end. Since a shield assembly is used in combination with the formed shield plate, the positioning of the spacer can be done easily and accurately, and there is no possibility that the spacer will shift or sink, which could lead to assembly failure. It has the effect of drastically reducing

Furthermore, since the spacer does not shift or sink, the operator does not need to be highly skilled, which makes the assembly work easier.

Furthermore, since the number of parts and the number of assembly steps are reduced, costs are reduced and work efficiency is improved.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a sectional view showing a magnetic head according to an embodiment of the present invention; FIG. 2 is a side view showing the shield assembly shown in FIG. and front view, Figure 3 (al and (bl) are Figure 2 (al and fb
The rear and side views of the spacer shown in Fig. 4+a) and fb) are shown in Figs.
Figures 5+8) to 8) to (d) shown in FIG. They are a side view and a front view. In the figure, 2.3...Magnetic head unit, 4-7...Magnetic core, 8...Magnetic tape sliding surface, 30...Central shield plate, 30a...Fitting convex 31...Spacer, 31a, 31b...Spacer part, 31c...Connecting part, 31d...Fitting recess, 32...Central shield assembly. Figure 1 i2 (a) Figure 2 (b) Figure 3 (a) Figure 3 (b) Figure 4 (0) Figure 4 (b)

Claims (1)

[Claims] A magnetic head in which a shield plate made of a magnetic material is disposed between a plurality of magnetic head units to magnetically shield each magnetic head unit, the magnetic head having left and right spacer parts whose upper ends are connected by a connecting part, and the above-mentioned connecting part. 1. A magnetic head comprising: a spacer having a fitting concave portion formed therein; and a shield plate having a fitting convex portion formed at an upper end portion thereof to fit into the fitting concave portion.