JPH0629771Y2 - Magnetic head - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to a magnetic head, and more particularly to improvement of a mounting structure of terminals for connecting ends of coils.

[Prior Art] FIGS. 3A to 3D are a top view, a front view, a bottom view and a side view showing a main part of a conventional magnetic head. In this conventional magnetic head, as shown by the dotted line in FIG. 3 (b), the coil bobbin 21 covers the yoke portion of the magnetic core 25 having the magnetic gap 25a, that is, the lower horizontal arm portion in the drawing so as to cover the yoke portion. Is attached to this coil bobbin 21
A coil 22 is wound around the.

The coil bobbin 21 is formed of an insulating resin or the like, and terminal insertion portions 23 are provided at both left and right ends thereof so as to extend integrally from the coil bobbin 21. One end of an L-shaped terminal 24 is inserted into and fixed to the terminal insertion portion 23, and an end 22a of the coil 22 is wound around and connected to an exposed portion of the other end of the terminal 24. There is.

The terminal insertion portion 23 is formed in a rectangular shape so as to enclose the bent portion of the terminal 24 that is bent in an L shape, and its corner portion is formed in a square shape. The end 22 a of the coil 22 wound around the coil bobbin 21 extends to the terminal 24 while being in contact with the corner of the terminal insertion portion 23, and is wound around the terminal 24.

[Problems to be solved by the invention]

In the conventional magnetic head described above, since the end 22a of the coil 22 wound around the coil bobbin 21 contacts the corner of the terminal insertion portion 23 and is wound around the terminal 24 fixed to the terminal insertion portion 23, The end portion 22a of the coil 22, which is wound around the terminal 24, that is, the lead wire portion, is stretched while coming into contact with the corner portion of the terminal insertion portion 23 due to thermal expansion of the terminal insertion portion 23 formed of resin or the like, There was a problem that it was easily broken.

The present invention has been made in view of the above, and an object thereof is to provide a magnetic head capable of effectively preventing disconnection of a coil due to thermal expansion of a terminal insertion portion.

[Means for solving problems]

In order to solve the above problems, the magnetic head of the present invention is
A coil bobbin in which a pair of terminal insertion portions are formed so as to extend obliquely outward at both ends and a coil is wound around the coil bobbin, and the pair of terminal insertion portions is provided with an inner side in the longitudinal direction of the coil bobbin. A pair of substantially L-shaped terminals connected to the ends of the coil and attached so as to project into
The pair of terminal insertion portions are characterized in that inner side surfaces in the longitudinal direction of the coil bobbin are formed in a substantially arcuate cross section.

[Action]

In the magnetic head of the present invention, a pair of terminal insertion portions whose inner side surfaces in the longitudinal direction of the coil bobbin are substantially arcuate in cross section at both ends of the coil bobbin around which the coil is wound extend obliquely outwardly in correspondence with each other. The terminal insertion portion is attached so as to project inward in the longitudinal direction of the coil bobbin, and the end portion of the coil is connected to this terminal.

〔Example〕

 The present invention will be described below with reference to the drawings.

FIG. 1 is a sectional view of a magnetic head according to an embodiment of the present invention. The magnetic head of the present embodiment is entirely shielded by a shield case 11, and is composed of a pair of magnetic core halves 12a and 12b combined inside.
Are installed. This magnetic core 12 shield case 1
In the portion exposed from 1, the magnetic core halves 12a, 12b
A magnetic gap 12g facing each other is formed.

In the yoke portion of the magnetic core 12, that is, in the horizontal arm portion on the side opposite to where the magnetic gap 12g is formed,
A coil bobbin 1 around which a coil 2 (see FIG. 2) is wound is mounted. In addition, at both ends of the coil bobbin 1,
A terminal insertion portion 3 integrally extending from the coil bobbin 1 is provided, and an L-shaped terminal 4 is inserted and fixed in the terminal insertion portion 3.

In more detail with reference to FIGS. 2 (a) to 2 (d), the terminals are inserted into both ends of the coil bobbin 1 mounted on the magnetic core 12 so that the portions extend downward and obliquely outward. Each section 3 is provided. Further, the terminal insertion portion 3 is formed so that the cross-sectional shape of the inner side surface in the longitudinal direction of the coil bobbin 1 draws an arc and has no corner portion. Then, the end portion of the L-shaped terminal 4 is inserted and fixed from the inner side into the terminal insertion portion 3 thus formed.

Since the terminal 4 is inserted and fixed to the terminal insertion portion 3 from the inner side, the bent portion is located so as to project to the inner side in the longitudinal direction of the coil bobbin 1, and further from this bent portion. The coil winding portion 4a is suspended. The end portion 2a of the coil 2, that is, the coil 2 is attached to the coil winding portion 4a.
The lead wire part of is wound and connected.

In the magnetic head of this embodiment having such a configuration, the lead wire portion of the end portion 2a of the coil 2 is connected to the terminal 4 without contacting the terminal insertion portion 3, and even if soldering to the terminal 4 is performed. Even if the inner side surface of the terminal insertion portion 3 having a substantially arcuate cross section thermally expands, the thermal expansion does not pull the end 2a of the coil 2 and the lead wire portion of the coil 2 is disconnected. There is no such thing.

[Effect of device]

As described above, according to the present invention, a pair of terminal insertion portions, which extend obliquely outward at both ends of the coil bobbin and are formed to correspond to each other, project inward in the longitudinal direction of the coil bobbin. Since the end of the coil is wound around and connected to the terminal attached to the terminal, the end of the coil does not come into contact with the terminal insertion part, and the coil disconnection due to thermal expansion of the terminal insertion part is prevented in advance. The effect is obtained.

[Brief description of drawings]

FIG. 1 is a sectional view of a magnetic head according to an embodiment of the present invention, and FIGS. 2 (a) to 2 (d) are a top view, a front view, and a front view, respectively, showing the main parts of the magnetic head shown in FIG. A bottom view and a side view, and FIGS. 3 (a) to 3 (d) are a top view, a front view, a bottom view and a side view, respectively, showing a main part of a conventional magnetic head. In the figure, 1 ... Coil bobbin, 2 ... Coil, 2a ... Coil end, 3 ... Terminal insertion part, 4 ... Terminal 4a ... Coil winding part, 12 ... Magnetic core.

Claims (1)

[Scope of utility model registration request] 1. A coil bobbin, in which a pair of terminal insertion portions are formed so as to extend obliquely outward at both ends and a coil is wound around the both ends, and a longitudinal direction of the coil bobbin in the pair of terminal insertion portions. A pair of substantially L-shaped terminals that are attached so as to project inward in the direction and that are connected to the ends of the coil, and the pair of terminal insertion portions are inward in the longitudinal direction of the coil bobbin. A magnetic head having a side surface formed in a substantially arcuate cross section.