JPH08273947A - Electric component with sintered body and its manufacture - Google Patents

Abstract

PURPOSE: To provide a coil component in which a coil terminal can be connected easily and which can be made thin. CONSTITUTION: Terminals 4 which are composed of a metal sheet are fixed and bonded to the flange part of a core 2. Protrusion parts 4b are formed at the terminals 4, and coil terminals 3a are bound to the parts so as to be fixed and bonded by solder 6. The terminals 4 are formed so as to be capable of being surface-mounted.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric component such as a coil component having a ferrite core and a method for manufacturing the same.

[0002]

2. Description of the Related Art A terminal is required to mount a coil component on a circuit board. Therefore, a conventional typical coil component is formed by arranging a coil body portion including a ferrite core and a coil on a terminal plate, and twisting the ends of the coil to the terminals of the terminal plate.

While the typical coil component described above has the advantage of being simple to manufacture, it has the disadvantage of being thick due to the terminal plate. In order to solve this kind of problem, a thick or thin terminal conductor layer (electrode layer) may be directly formed on the ferrite core, and the terminal of the coil may be fixed to the terminal conductor layer by welding, crimping, or soldering. Already proposed.

[0004]

By providing a terminal conductor layer directly on the above-mentioned ferrite core, a reduction in thickness can be achieved, but it has a drawback that the step of forming the terminal conductor layer becomes complicated. Further, since the ends of the coil cannot be bent and connected, the ends cannot be connected in the extension of the winding process, and the manufacturing process becomes complicated. Although the coil component has been described above, other electric components similar to the coil component have similar problems.

Therefore, an object of the present invention is to provide an electric component which can be thinned or downsized and which can be easily manufactured, and a manufacturing method thereof.

[0006]

The present invention for achieving the above object comprises an insulating sintered body and a conductive terminal fixed to the sintered body by an adhesive made of glass or resin. The terminal is a metal piece terminal made of a metal plate or a metal rod having a portion protruding from the sintered body, and relates to an electric component. Further, as described in claim 2, it is preferable that a protrusion is provided on the terminal and is used as a bent portion of the end of the coil. Claim 3
It is desirable to apply a paste or slurry glass adhesive to one or both of the core and the terminal and to fire the terminal while pressing the terminal against the core with the glass adhesive as shown in FIG.

[0007]

According to the invention of each claim, since the terminal is adhered to the sintered body, the terminal plate becomes unnecessary,
Thinning or miniaturization of electric parts is achieved. Further, since the terminal is not a conductor layer, it can be formed into an arbitrary shape, and the electrical connection of the terminal of the coil or the like becomes easy. By using a glass material as the adhesive as described in claims 1 and 3, it is possible to firmly and firmly fix the terminal to the sintered body. When the terminal is provided with the protruding portion as in the second and third aspects, the end of the coil or the like can be easily adhered by bending.

[0008]

[First Embodiment] Next, a surface mount type coil component according to a first embodiment of the present invention will be described with reference to FIGS.
The coil component 1 includes a ferrite core 2 made of a hard magnetic material made of a sintered body, a coil 3 wound around the ferrite core 2, and a pair of metal terminals 4.

As shown in FIG. 3, the ferrite core 2 has a central coil winding portion 2a and a pair of flange portions, that is, a collar portion 2.
b, 2c. A metal terminal 4 made of a metal piece formed by bending a metal plate into a crank shape is fixed to the flange portion 2c with a glass adhesive material 5. More specifically, the terminal 4 has a relatively wide main portion 4a bonded to the bottom surface and side surfaces of the flange portion 2c of the core 2 with an adhesive material 5 and a main portion 4a protruding in a direction away from the flange portion 2c (outward direction). It has a narrower protrusion 4b. This terminal 4 is a metal plate such as phosphor bronze or brass having a surface antioxidation treatment (for example, a thickness of 0.05 to 0.5 m).
m) is punched into a predetermined pattern and bent. The pair of terminals 3 a of the coil 3 are respectively bent from the pair of projecting portions 4 b of the terminal 4 and fixed by the solder 6.

When manufacturing the coil component 1, first,
The core 2 and the terminal 4 are prepared. Next, the collar portion 2c of the core 2
A paste-like or slurry-like glass composed of a glass powder containing B ₂ O ₃ , PbO, and ZnO as main components and a vehicle on one or both of the bottom and side surfaces of the core and the surface of the terminal 4 facing the core. 400-900 while applying the material and pressing the terminal 4 against the core 2 with the jig through the glass material.
The terminal 4 is fixed by the adhesive 5 by firing at 10 ° C. for 10 to 60 minutes. Next, the coil winding portion 2a at the center of the core 2
On the other hand, a conductor wire made of, for example, copper having a thermoplastic insulating coating such as polyurethane is wound. In addition, following this winding step, the covered winding is twisted on the protruding portion 4b of the terminal 4.
Next, the protruding portion 4 of the terminal 4 in which the coil end 3a is twisted
The b is immersed in the solder bath to achieve the fixation by the solder 6. The insulating coating of the lead wire in the terminal 3a is melted or burned down by the heat when the solder is dipped, and the lead wire is electrically connected to the terminal 4.

The completed coil component 1 shown in FIG. 1 is placed on a circuit board (not shown), and the terminals 4 are fixed to the wiring conductors of the circuit board by soldering. Since the wide main portion 4a of the terminal 4 extends not only to the bottom surface of the collar portion 2c of the core 2 but also to the side surface, solder due to solder reflow or the like adheres not only to the bottom surface of the terminal 4 but also to the side surface. Is tightly bound to.

As is apparent from the above, the coil component 1 of this embodiment has the following advantages. (1) Since the terminal 4 made of a metal plate is directly bonded to the core 2, the terminal plate is not required, and the thinning and downsizing are achieved. (2) Pb- when the terminal 4 fixes this to the circuit board
The melting point of the Sn-based solder and the solder 6 of the terminal 3a (about 30 at maximum)
Since it is fixed to the core 2 by the glass adhesive 5 having a melting point higher than 0 ° C.), high heat resistance is achieved, and heat when soldering the coil component 1 to the circuit board or solder of the terminal 3a. The fixing strength of the terminal 4 does not decrease due to the heat during mounting. (3) Since the terminal 4 is fixed to the core 2 by the paste-like or slurry-like glass material, this fixing can be easily achieved. (4) Since the terminal 4 is made of a metal plate and has the protruding portion 4b, the coil terminal 3a can be bent, and the connection of the coil 3 to the terminal 4 can be easily achieved. (5) Since the projecting portion 4b of the terminal 4 is projected outward, the coil terminal 3a can be separated from the coil body portion of the winding portion 2a, and the coil body 3 when the projecting portion 4b is immersed in the solder bath. The part can be protected from the heat of the solder bath.

[0013]

[Second Embodiment] Next, a coil component according to a second embodiment will be described with reference to FIGS. However, in FIGS. 5 to 8, substantially the same parts as those in FIGS. 1 to 4 are denoted by the same reference numerals, and the description thereof will be omitted. The coil component of the second embodiment has the same structure as that of the first embodiment except that the shape of the metal terminal 4 is changed. 5 to 8, the metal terminal 4
The main portion 4a is formed so as to cover the bottom surface of the collar portion 2c of the core 2 and a part of the three side surfaces. As a result, the solder connection of the metal terminal to the circuit board becomes strong, and the collar portion 2c
It is possible to mechanically protect the corners and the like. This embodiment naturally has the same effects as the first embodiment.

[Modifications] The present invention is not limited to the above-described embodiment, and for example, the following modifications are possible. (1) In order to protect the main body of the coil 3 from the heat of the solder bath when the protruding portion 4b is immersed in solder, the lower flange portion 2c of the core 2 may be formed larger than the upper flange portion 2b. . (2) Glass material is SiO ₂ , B ₂ O ₃ , PbO, Zn
It can contain O, or can contain B ₂ O ₃ , PbO, ZnO, or can contain PbO, B ₂ O ₃ , SiO ₂ , or Al ₂ O ₃ . (3) It is possible to provide more than two terminals 4 and to make the number of coils 3 plural. It can also be applied to a transformer. (4) The present invention can be applied to the fixing of the metal terminal to the dielectric ceramic. (5) The metal terminal may be rod-shaped. (6) As shown in FIG. 9, recesses 10 for positioning the terminals 4 are provided on the bottom surface and the side surfaces of the flange portion 2c of the core 2, and the terminals 4 can be fixed thereto by an adhesive material of glass or resin. As a result, the terminal 4 is firmly connected to the predetermined position. (7) As shown in FIG. 10, after the coil end 3a is entangled with the protrusion 4b of the terminal 4 and joined by the solder 6, the protrusion 4
b can be bent upwards. As a result, it is possible to reduce the occupied area of the coil component when viewed two-dimensionally.

[Brief description of drawings]

FIG. 1 is a front view showing a coil component according to a first embodiment.

FIG. 2 is a plan view showing a core having the terminal of FIG.

FIG. 3 is a sectional view taken along line AA of FIG.

FIG. 4 is a bottom view of a core having the terminals of FIG.

FIG. 5 is a front view showing a coil component of a second embodiment.

FIG. 6 is a plan view showing a core having the terminals of FIG.

FIG. 7 is a cross-sectional view showing line BB in FIG.

FIG. 8 is a bottom view of a core having the terminal of FIG.

FIG. 9 is a front view of a core having modified terminals.

FIG. 10 is a front view of a coil component of a modified example.

[Explanation of symbols]

 1 coil parts 2 core 4 terminal 5 glass adhesive

Claims (3)

[Claims] 1. An insulating sintered body, and a conductive terminal fixed to the sintered body with an adhesive made of glass or resin. The terminal has a portion protruding from the sintered body. An electric component, which is a metal piece terminal composed of a metal plate or a metal rod. 2. A core made of a sintered body, a coil wound around the core, and a terminal fixed to the core with an adhesive, the terminal having a protrusion protruding in a direction away from the core. An electric component, comprising: the end of the coil being entangled with the protrusion. 3. A step of preparing an insulating core made of a sintered body and a metal terminal, and a step of applying a paste or slurry glass adhesive to one or both of the core and the terminal. A step of firing the terminal against the core through the glass adhesive material at a temperature of 400 to 900 ° C. for 10 to 60 minutes to fix the terminal to the core. Manufacturing method.