JPS60260109A - Small size coil - Google Patents

Abstract

PURPOSE:To eliminate a problem of quality by a mechanical stress on the terminal by forming a structure having the horizontal portion as the terminal to be attached to the protruded terminal fitting portions in both sides of external side surface of the one collar of a drum type core. CONSTITUTION:The terminals 15, 16 structured by the fixed portions 15a, 16a combined to the terminal fitting portions 13, 14 formed in the right and left sides of protrusion 12, the tapered portions 15b, 16b, the horizontal portions 15c, 16c and the wiring portions 15d, 16d protruded from the fixed portions 15a, 16b at a right angle thereto are comprised at the external surface of the one collar 11a of a drum type core 11. An external case made of resin is formed to the drum type core 11 providing a coil 17. The tapered portions 15b, 16b of terminals 15, 16 and the wiring portions 15d, 16d protruded from the fixed portions 15a, 16a are molded and the end portions of horizontal portions 15c, 16c of terminals 15, 16 are bent perpendicularly, thereby forming a radial lead type small size coil.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a small coil used in various electronic devices.

Conventional structure and its problems Conventional small coils have been constructed as shown in FIGS. 1 to 5. That is, terminal grooves 2 and 3 into which fixing parts 4a and 5a of terminals 4 and 6 are fitted are provided in one of the flanges 1a of a drum-shaped core 1 having flanges 1a and 1b at both ends, and the terminals are fixed in these terminal grooves 2 and 3. The parts 4a and 5a are inserted and fixed with adhesive, etc., and the coil 6 is wound around this drum-shaped core 1.
Coil lead 6a at the beginning and end of 60 turns of this coil
.

6b is wound around the tapered portions 4b and sb of the terminals 4 and 6 and connected by soldering, an exterior 7 made of synthetic resin is applied, and a horizontal portion protrudes outward from the tips of the tapered portions 4b and 6b of the terminals 4 and 6. The parts 4C and 5C were formed by bending the end faces of the exterior 7.

In the small coil according to the above-mentioned conventional example, after forming the outer sheath, the horizontal parts 4c and 5c of the terminals 4 and 5 are bent.

Coil lead 6 starts and ends coil 60 on 5b.
Wrapping a and eb and connecting with solder,
When bending the horizontal portions 4C and 5c of the terminals 4 and 5, mechanical stress is applied to the tapered portions 4b and sb of the terminals 4 and 5 due to the condition of the sheath 7, causing the coil leads 6a made of thin wire to Disconnection or half-disconnection of the 6b occurred, which included fatal quality problems for small coils, and was extremely disadvantageous in terms of mass production and cost.

Purpose of the Invention The present invention is intended to eliminate the above-mentioned disadvantages of the conventional coil, and to provide a small coil that eliminates quality problems caused by mechanical stress of terminals and maintains the conventional productivity. be.

Structure of the Invention In order to achieve the above object, the small coil of the present invention has a drum-shaped core having buckwheat at both ends.
A fixed part that is guided and fitted into the terminal mounting part on both sides of the protruding part and is adhesively bonded to the terminal mounting part on both sides of the book, a tapered part rising from this fixed part, and a tip of this tapered part. A terminal having a horizontal part projecting outward and a wiring part projecting horizontally from the fixed part in a direction perpendicular to the horizontal part is attached to the drum-shaped core, and the coil is wound around the drum-shaped core. The lead is connected to the wiring part of the terminal, and the drum-shaped core, the wiring part of the terminal, and the tapered part are molded with a resin exterior, and with this configuration, even if the horizontal part of the terminal is bent, the coil lead will not break. Things like this can be prevented.

DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments of the present invention will be explained with reference to FIGS. 6 to 12 of the drawings.

First, in Figures 6 to 11, 11 has brim 1 on both ends.
1a and 11b, and one rib 11a of this drum-shaped core 11 has a single protrusion 12 formed at the center of the outside surface of the collar 11a. This ridge 12
Planar terminal mounting portions 13, 14 are formed on the left and right sides of the terminal mounting portion 13.
Tapered portions 15b, 16b rising from one end of 6a, horizontal portions 15c, 16c protruding outward from the tips of the tapered portions 15b, 16b, and these protruding horizontal portions 15c, 1
A fixed part 15a is perpendicular to 6c.

Terminals 15 and 16 constituted by 1eajj7 and protruding wiring portions 1sd and 1ed are incorporated and coupled.

These terminals 15 and 16 may be made by punching out a metal plate into individual pieces.
It is advantageous to use a metal hoop material 18 as shown in FIG.

A coil 17 is wound around the drum-shaped core 11, and coil leads 17a and 1 at the beginning and end of the winding of the coil 17, respectively.
7b is wound around wiring parts 15d and 16d protruding from fixed parts 15a and 16a of terminals 115 and 16, and connected by soldering.

As shown in FIG. 6, an outer device 9 made of resin is formed on the drum-shaped core 11 around which the coil 17 is wound.
This outer device 9 includes tapered portions 15b and 1e of terminals 15.16.
b, and a wiring portion 16d protruding from the fixed portions 15a and 16a.
, 16d, and horizontal part 15 of terminal 15.18.
The tip of c and 16c are bent vertically to form a small radial lead type coil. Also, the 12th
Horizontal part 16C916C of terminal 15.16 as shown in the figure
without vertically bending the ends of the horizontal parts 15c and 16.
Horizontal parts 15c and 16 at the tip without bending on c.
The small coil may be configured as a chip component by cutting c into an appropriate size.

Effects of the Invention As described above, the small coil of the present invention is used as a terminal to be attached to the terminal attachment portions on both sides of the protrusion on the outer surface of one brim of a drum-shaped core. , a horizontal part extending from one end of this fixing part, a tapered part rising from the other end, and a horizontal part protruding outward at the tip of this tapered part, so that printed circuit boards etc. Reliability is further improved by separating the horizontal part that connects to the coil lead and the wiring part that connects the coil lead, and the production process is no worse than conventional small coils, making it suitable for mass production. It has the advantage of being easy to control in terms of quality and is a dog of industrial value.

[Brief explanation of the drawing]

Figure 1 is a perspective view of a conventional small coil, Figure 2 is a sectional view of the same, Figures 3, 4, and 6 are perspective views of the same in the process of being assembled.
The figure is a perspective view showing one embodiment of the small coil of the present invention.
The figure is a sectional view of the same, Figures 8 to 1o are perspective views of the same during assembly, and Figure 11 is a perspective view showing an example of a terminal used in the coil.
FIG. 12 is a perspective view of a small coil according to another embodiment. 11...Drum-shaped core, 11a, 11b...Brim, 12...Convex strip, 13.14 Terminal mounting part, 1
5.16 Terminal, 15a, 16a - Fixed part, 15b,
16b...Tapered part, 15c, 16c...Horizontal part, 1sd, 1ed...Wiring part protruding from the fixed part, 1
7...Coil, 17a, 17b...Coil lead, 19...Exterior. Name of agent: Patent attorney Toshio Nakao and 1 other person

Claims (1)

[Claims] A protruding strip is provided on the outer surface of one side of the drum-shaped core having flanges at both ends, and a fixing portion is guided and fitted into the terminal mounting portions on both sides of the protruding strip and is adhesively bonded. The above-mentioned terminal has a tapered part that rises from the fixed part, a horizontal part that projects outward at the tip of this tapered part, and a wiring part that projects horizontally from the fixed part in a direction perpendicular to this horizontal part. A small coil that is attached to a drum-shaped core, the coil lead of the coil wound around the drum-shaped core is connected to the wiring part of the terminal, and the drum-shaped core, the wiring part of the terminal, and the tapered part are externally molded with resin. .