JPH1012457A - Surface mounting type inductor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To have a terminal structure tough against solder re-flow and re-flow mounting and to allow adjustment of inductance value with ease by jointing a surface mounting terminal coated with solder to a flat part side of a flange of a T-shape core and connecting the lead wire of a coil to the surface mounting terminal. SOLUTION: A surface mounting terminal 3 is combined to a flat part 12 of a flange of a T-shape core 1, and after a coil 5 wound with a melt-adhesion copper wire 8 is incorporated in the T-shape core 1, a lead wire 11 of the coil 5 is entangled to a pin terminal part 13 of the surface mounting terminal 3, for soldering. Then, covered with a U-shape lidded ring core 2, and jointed to the T-shape core 1 with a bonding agent 6, etc., a surface mounting inductor is obtained. In addition, after the coil 5 of the same winding number attached to the T-shape core 1, a specified gap is formed and adjusted at a joint part when the U-shape lidded ring core 2 is placed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a surface mount type inductor used for electronic circuits and the like.

[0002]

2. Description of the Related Art First, a conventional inductor of this type will be described with reference to FIG. FIG. 3 is a perspective view showing an example of a conventional inductor. Generally, in a conventional type inductor in which a winding is applied to a drum core, as shown in FIG. 3, a round pin terminal 9 is press-fitted and adhered to the bottom surface of the drum core 7, and the winding is applied to a column 10 of the drum core 7. After forming the coil 5 by applying the coil 5
And soldering was performed.

[0003]

In the coil shown in FIG. 3, since the pin terminals 9 do not have a terminal structure for reflow mounting, there is a problem that high-density mounting cannot be performed. The drum core used for this inductor is
Since the drum core has a predetermined shape, there is a problem that the inductance value can be adjusted only by adjusting the winding.

Accordingly, an object of the present invention is to provide a surface mount type inductor having a terminal structure capable of withstanding solder reflow and reflow mounting and capable of easily adjusting an inductance value.

[0005]

SUMMARY OF THE INVENTION The present invention relates to a surface mount type inductor in which a coil is wound around a columnar portion of a T-shaped core having a substantially T-shaped cross section and a ring core with a lid having a substantially U-shaped cross section is combined. Wherein a surface-mounting terminal plated with solder is joined to the flat portion side of the flange of the T-shaped core, and a lead wire of the coil is connected to the surface-mounting terminal. Type inductor.

The present invention relates to a surface mount type inductor comprising a combination of a T-shaped core having a substantially T-shaped cross section and a ring core with a lid having a substantially U-shaped cross section. The surface mount type inductor described above, wherein a gap is formed in a combination portion of the ring core.

According to the present invention, since it has a terminal structure capable of reflow mounting, an inductor which can be mounted at high density on various electronic equipment circuit boards can be obtained.

Further, since the T-shaped core is magnetically shielded by a U-shaped ring core with a lid, the leakage density of magnetic flux is smaller than that of a conventional coil.

Also, by adjusting the gap of the T-shaped core,
Surface mount type inductors having different inductance values can be easily manufactured.

[0010]

Embodiments of the present invention will be described below in detail with reference to the drawings.

FIG. 1 is a partially cutaway perspective view of the surface mount inductor of the present invention, and FIG. 2 is an exploded perspective view of the surface mount inductor of the present invention. As shown in FIGS. 1 and 2, the surface mounting terminal 3 is connected to the flat portion 12 of the flange of the T-shaped core 1, and the coil 5 wound with a fused copper wire 8 is used as the T coil.
After assembling into the character-shaped core 1, the lead wire 11 of the coil 5 is wrapped around the pin terminal portion 13 of the surface mounting terminal 3, and soldering is performed.

Thereafter, the U-shaped ring core 2 with a lid is covered and joined to the T-shaped core 1 with an adhesive 6 or the like to obtain a surface mount inductor.

When the coil 5 having the same number of turns is mounted on the T-shaped core 1 and then covered with the U-shaped ring core 2 with a lid, a predetermined gap is formed and adjusted at the joint thereof. Several types of inductance values can be easily obtained.

[0014]

According to the present invention, the terminal structure of the reflow mounting, in which the terminal is easily soldered, can be checked for the soldering state after mounting on the circuit board, and the inductance value can be adjusted and easily. A surface mount inductor with a simple manufacturing method can be obtained.

[Brief description of the drawings]

FIG. 1 is a partially cutaway perspective view of a surface mount inductor according to the present invention.

FIG. 2 is an exploded perspective view of the surface mount inductor according to the present invention.

FIG. 3 is a perspective view of a conventional inductor.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 T-shaped core 2 Ring core with a U-shaped lid 3 Surface mounting terminal 4 Soldering part 5 Coil 6 Adhesive 7 Drum core 8 Fused copper wire 9 Pin terminal 10 Column 11 Lead wire 12 Flat part of flange 13 Pin Terminal

Claims (2)

[Claims] 1. A surface-mounted inductor in which a coil is wound around a columnar portion of a T-shaped core having a substantially T-shaped cross section, and a ring core with a lid having a substantially U-shaped cross section is combined, wherein said T-shaped inductor is provided. A surface-mounted inductor, wherein a solder-plated surface-mounting terminal is joined to a flat portion of a core flange, and a lead wire of the coil is connected to the surface-mounting terminal. 2. A surface mount inductor comprising a combination of a T-shaped core having a substantially T-shaped cross section and a ring core having a substantially U-shaped cross section, wherein the T-shaped core and the ring core having the lid are combined. The surface mount type inductor according to claim 1, wherein a gap is formed in the combination portion.