JP3180262B2 - Thin inductor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a thin inductor which is particularly thin and compact.

[0002]

2. Description of the Related Art As a conventional inductor of this type, FIG.
As shown in FIG. 4, there is a type in which a winding 16 is directly applied to the drum-type core 10, installed in a concave portion 14 of a base 13 made of an electrically insulating material, in which terminals 15 are implanted, and fixed by adhesion.
Recently, there has been an increasing demand for surface mount components, and as a result, a reduction in thickness (requiring a height of about 3 mm or less as a product) has been pursued. However, in the inductor, it is necessary to reduce the thickness of the drum core 10, particularly the thickness of the upper and lower flanges 11 and 12. And the productivity and the reliability are extremely deteriorated, resulting in an expensive product.

[0003]

The problem to be solved is that in the structure and shape for reducing the thickness and size of the inductor, the structure using the conventional drum type core has a limit in the thickness and size reduction. In particular, when the thickness of the flange portion of the drum-shaped core is reduced, chips and cracks are generated, and the reliability is reduced. Another object of the present invention is to provide a structure that does not reduce the inductance value of the inductor even when the thickness is reduced.

[0004]

According to the present invention, a positioning flange for incorporating a rod-shaped core on one surface of a base and a flange for incorporating a ring-shaped core on the outside thereof are integrally formed. A base provided with terminals on both side ends, a thin rod-shaped core disposed in an installation space inside the positioning flange, and a flange for incorporating the positioning flange and the ring-shaped core. An air-core coil incorporated in a space between the air-core coil, and a ring-shaped core arranged outside the flange for incorporating the ring-shaped core and positioned inside by the flange. Are connected to the terminals on both ends, respectively, to obtain a thin inductor.

[0005]

According to the present invention, a thin plate-shaped rod-shaped core is arranged on the inside of the inner flange at the center thereof on a base having terminals on both ends and having a concentric flange on one surface, and this rod-shaped core is A thin plate-shaped air-core coil is arranged between the inner and outer flanges so as to surround it, and a ring-shaped core is arranged around the outer flange. Compared with the conventional configuration using a drum core, there is no upper and lower flange portions of the drum core, but a reduction in inductance can be compensated for by a ring-shaped core disposed so as to wrap the air core coil from the outside. The upper and lower flanges of the core are not required, the thickness of the inductance can be reduced, and the production is more convenient, and the product is less expensive.

[0006]

FIG. 1 is an exploded perspective view of a thin inductor according to the present invention. FIG. 2 is a perspective view of a thin inductor according to the present invention. At the center of the base 1 having a rectangular flat plate and terminals 2 provided at both ends, a circular flange 4 for positioning into which a thinly formed rod-shaped core 5 is incorporated, and a ring-shaped core 7 on the outside thereof. Is formed to form a circular flange 3. The base 1, the circular flange 3, and the positioning circular flange 4 are made of resin and are integrally formed by thermoforming. The terminal 2 is formed by pressing a U-shaped copper foil onto the base 1 during the above-mentioned integral molding. Alternatively, the terminals 2 are mounted on the integrally formed base 1 by printing or bonding silver paste or the like. The thin rod-shaped core 5 is incorporated in the installation space portion 8 of the base 1, and the annular air-core coil 6 is connected to the circular flange 4 of the base 1.
In addition, it is incorporated in the space 9 between the circular flanges 3. Further, the ring-shaped core 7 is positioned concentrically by the circular flange 3 of the base 1 to prevent displacement, and is assembled concentrically. The lead of the annular air-core coil 6 is soldered to the terminal 2. The central rod-shaped core 5 has a configuration in which the distance of the open magnetic path is long and the inductance value is reduced by preventing the inductance value from being reduced by incorporating the ring-shaped core 7 to shorten the open magnetic path distance. I have. By using the rod-shaped core 5 and the ring-shaped core 7, compared to the drum core of the conventional shape, even if it is thin, the inductance value does not decrease.
On the other hand, the strength of the core is also increased, and the molding of the core is facilitated. Since the material cost is low and the manufacturing is simple in shape and structure, automation by a machine is easy. As described above, according to the present invention, it is possible to provide a thin inductor having advantages of being thin and inexpensive.

[0007]

As described above, the thin inductor according to the present invention has a positioning flange for incorporating a rod-shaped core on one surface of a base and a flange for incorporating a ring-shaped core on the outside thereof. And a base formed with terminals at both ends, a thin rod-shaped core disposed in an installation space inside the positioning flange, the positioning flange and the ring-shaped core. An air-core coil incorporated in the space between the flange and the outer periphery of the flange for incorporating the ring-shaped core, a ring-shaped core positioned inside by the flange is disposed, the said The lead-out leads of the air-core coil are connected to the terminals on both ends, respectively, whereby a thin inductor which is thin, has good assembling workability, and has high reliability can be supplied at low cost.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view of a thin inductor of the present invention. The figure which showed each component.

FIG. 2 is a perspective view showing a completed state of a thin inductor according to the present invention in which a core and a coil are incorporated in a base.

FIG. 3 is an exploded perspective view of a conventional thin inductor (wound around a drum core and incorporated into a base).

FIG. 4 is a perspective view showing a completed state of a conventional thin inductor.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Base 2 Terminal 3 Circular flange 4 Circular flange 5 Bar-shaped core 6 Toroidal air-core coil 7 Ring-shaped core 8 Installation space 9 Space 10 Drum core 11 Upper flange 12 (of drum core) Lower flange 12 of drum core Part 13 (conventional flat plate) base 14 recess 15 terminal 16 winding

Claims (1)

(57) [Claims] 1. A base having a positioning flange for incorporating a rod-shaped core on one surface of a base and a flange for incorporating a ring-shaped core on the outside thereof, and a base provided with terminals on both ends. A thin rod-shaped core disposed in an installation space inside the positioning flange, and an empty space incorporated in a space between the positioning flange and the flange for incorporating the ring-shaped core. A core coil, and a ring-shaped core that is positioned outside the flange for incorporating the ring-shaped core and is positioned with the inside positioned by the flange, and pulls out the lead of the air-core coil to the terminals on both ends. Thin inductors, each connected.