JPH05275237A - Coil assembly - Google Patents

Abstract

PURPOSE:To facilitate automation of coil mounting and reduce the processing expenditure or the material expenditure of a coil spool. CONSTITUTION:The connection with a substrate 1 becomes easy and the automation becomes possible by making the terminal 6 of a spool 5 out of the same material as a spool 5, and wrapping the lead wire of a coil 3. Furthermore, since there is no need of a metallic terminal, the material expenditure of the spool also is cut down.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a coil assembly such as a current sensor, and more particularly to a lead terminal of an exciting coil for generating a magnetic field.

[0002]

2. Description of the Related Art Conventionally, in this type of coil assembly, the lead wire of the coil wound around the spool is directly soldered to the substrate, or the metal terminal provided on the spool portion is bent and soldered. ing.

2A and 2B are a front view and a side view of a conventional coil assembly, respectively. Figure 2
As shown in (a) and (b), the conventional coil assembly has a spool 5 around which the coil 3 is wound, a terminal portion in which a lead wire of the coil 3 is embedded in a metal terminal 6A embedded in the spool 5, U-shaped ferromagnetic core 4 that penetrates the spool 5
And a Hall element 2 for forming a magnetic circuit system on a flat substrate 1
It is installed in. A detection circuit (not shown) that amplifies and outputs the output of the hall element 2 is also formed on the substrate 1. Moreover, the detection circuit and the lead wire are connected to the wiring of the substrate 1 by soldering.

[0004]

The above-mentioned conventional coil assembly has a drawback that automation is difficult when the coil lead wire is directly soldered to the substrate. Further, when the coil lead wire is connected to the metal terminal by being twisted, the coil mounting can be automated, but the metal terminal needs to be embedded in the spool, resulting in an increase in material cost.

An object of the present invention is to provide a coil assembly capable of realizing such automation of coil mounting and reducing the processing cost and the material cost of the coil spool.

[0006]

SUMMARY OF THE INVENTION A coil assembly according to the present invention comprises an insulator spool mounted on a substrate, a coil for generating a magnetic field wound around the spool, and a ferromagnetic body penetrating the spool. A core is provided, a protrusion is provided on a part of the spool to form a terminal, and a lead wire of the coil is twisted to the terminal.

[0007]

Embodiments of the present invention will now be described with reference to the drawings. 1A and 1B are respectively a front view and a side view of a coil assembly showing an embodiment of the present invention. As shown in FIGS. 1A and 1B, in this embodiment, a ferromagnetic core 4 having a part of a magnetic path opened, and a spool around which one end of the core 4 and a coil 3 are wound. 5
And the Hall element 2 are mounted on the substrate 1. One end of the spool 5 forms a resin terminal 6 for the lead wire of the coil 3, and after the lead wire is twisted, it is connected to the substrate 1 by soldering. The resin terminal 6 is made of the same resin material as the spool 5, and is made of a resin that can withstand the soldering temperature. Further, on the substrate 1, the above-mentioned FIG.
Similarly to the conventional example of (b), the Hall element 2 arranged near the opening of the core 4 is mounted, and a detection circuit (not shown) that amplifies and outputs the output of the Hall element 2 is formed.

In this way, the resin terminal 6 for the lead wire is formed of the same material as the spool 5 and is integrally formed by using a resin that can withstand the soldering temperature, and the lead wire is directly wound on the resin terminal 6. As a result, the coil lead wire is directly connected to the substrate 1.
Unlike the case of soldering, the coil mounting can be automated and the processing cost can be reduced. Further, in this embodiment, since the metal terminal for pulling out the lead wire is unnecessary,
Material costs can also be reduced. In the above-described embodiment, the case where the ferromagnetic core is excited has been described, but the object to be excited is not limited to the ferromagnetic core, and may be one that drives a contact such as a reed switch.

[0009]

As described above, in the coil assembly of the present invention, the terminal for the lead wire of the coil is made of the same material as that of the spool and is integrally formed by using the resin which can withstand the soldering temperature. By directly tying the lead wire to the resin terminal, the coil mounting can be automated and the processing cost can be reduced. In addition, the metal terminal is not required, and the material cost can be reduced.

[Brief description of drawings]

FIG. 1 is a view showing a front surface and a side surface of a coil assembly showing an embodiment of the present invention.

FIG. 2 is a view showing a front surface and a side surface of a coil assembly showing a conventional example.

[Explanation of symbols]

 1 substrate 2 hall element 3 coil 4 ferromagnetic core 5 spool 6 resin terminal

Claims (3)

[Claims] 1. A spool of an insulator mounted on a substrate,
The coil has a coil for generating a magnetic field wound around the spool, and a ferromagnetic core that penetrates the spool. A protrusion is provided on a part of the spool to serve as a terminal, and the lead wire of the coil serves as the terminal. A coil assembly characterized by being entangled. 2. The coil assembly according to claim 1, wherein the terminal portion of the spool is plated with a conductor. 3. The coil assembly according to claim 1, wherein the lead wire of the coil is pre-soldered on a tip portion thereof.