JPH0369103A - Chip-type coil and manufacture thereof - Google Patents

Abstract

PURPOSE:To facilitate automatic manufacture of the part and enable the mounting to a surface by providing two electrode terminal plates applied to the axially open end part of one flange part of a core, two ends of a winding being electrically connected respectively thereto via binding grooves provided in the parts projected from the flange part. CONSTITUTION:There are provided a core 20 having flange parts 20a, 20b at both ends thereof, a winding 26 wound about the core 20, two electrode terminal plates 21, 22 applied to the axially open end part of said one flange part 20a so that they are radially projected in mutually spaced apart relation to which two ends 26a, 26b of a winding 26 are connected respectively via binding grooves 21a, 21b in the projected parts from the flange part 20a, molding resin 25 for uniting the core 20, the winding 26, and said two electrode terminal plates 21, 22. Thus, the chucking of the core to an automatic winding machine is facilitated. Further, the binding treatment of the winding end to the electrode terminal plate is also facilitated, and moreover, the winding is not projected from the electrode terminal plate and the coil mounting surface can be made flat.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a chip-shaped coil and a method for manufacturing the same. ：&Kikai's chip-shaped coil with excellent performance and mass productivity! This is related to the 12-piece construction method.

BACKGROUND ART Recently, when various electronic components are automatically mounted on a board, there has been an increasing demand for higher density and for surface mounting that does not require insertion of lead wires into the board. For this reason, electronic components such as resistors, capacitors, and low/high frequency coils (also called "inductors") are either of the "axial type," in which the lead wires extend axially from the element, or the lead wires extend radially. The extended ``radial type'' model has gradually shifted to integrated parts in the form of chips.

Therefore, a technique is known in which the axial coil is made into a chip. FIG. 4 shows the manufacturing process of an axial coil over time, in which a recessed groove 10a of a desired diameter is formed in the center of both axial ends of a spool-shaped ferrite core 10. (See FIG. 4(a)) Then, one end of the lead terminal 12 is processed into a flat head using a header (not shown).

The flat head 12a is inserted into the recessed groove 10a of the core O, and as shown in FIG. Terminal 12 is extended.

Next, after winding the thin metal wire 16 around the core 10 a required number of times using a single winding machine (not shown), each end 16a of the thin wire 16 is tied to the base of each lead terminal 12 and soldered, for example. As a result, an axial coil 18 as shown in FIG. 4(c) is obtained.

When making the axial coil 18 obtained in this way into a chip, the lead terminals 12 are bent and
Crush the bent end to make a flat terminal. Then, with the tip of the flat terminal exposed to the outside, a chip-shaped coil is manufactured by performing mold encapsulation with a desired resin.

In addition, a thin metal wire is wound in advance a required number of times around a spool-shaped ferrite core that does not have lead terminals attached to it, and each end of the thin metal wire is soldered to the end surface of the core along with a surface-mountable terminal, and then molded. There are also models.

Problems to be Solved by the Invention When attempting to automatically manufacture a product, as described above, by making electronic components have a structure that allows surface mounting, the process of mounting them on a board can be easily automated. However, while creating a structure that allows surface mounting, it is also necessary to automate the manufacturing of the electronic components themselves, and the quality of each electronic component must also be improved.

Among the above-mentioned axial coils, those that use lead terminals 12 bend and crush the lead terminals 12 to form flat terminals, so the terminals tend to break at the bends, making them less reliable as electronic components. There is a serious problem with sexuality. Further, in a type that does not use lead terminals, when winding a thin metal wire around a ferrite core, it is necessary to grip one flange of the core with a gripping section of an automatic winding machine, for example.

Therefore, in order to solder both ends of the thin metal wire to the end of the core along with surface-mountable terminals, the core must be removed from the grip, which increases the number of processing steps and reduces manufacturing efficiency. Difficulties are pointed out.

OBJECTS OF THE INVENTION The present invention has been proposed in order to suitably solve the problems inherent in the chip-shaped coil described above. The object of the present invention is to provide a chip-shaped coil having a structure that can be mounted and a method for manufacturing the same.

Means for Solving the Problems In order to solve the above-mentioned problems and achieve the intended purpose, a chip-shaped coil according to the present invention includes a core having flange portions at both ends, and a coil wound around the core. The winding wire is attached to the axially open end of the one flange portion so as to be spaced apart from each other and protrude in the radial direction, and the winding wire is attached to the winding wire through a groove formed in a portion protruding from the flange portion. It is characterized by comprising two electrode terminal plates whose two ends are electrically connected to each other, and a molded resin that integrates the core, the winding, and the two electrode terminal plates.

Further, in the method for manufacturing a chip-shaped coil according to another invention of the present application for suitably manufacturing the chip-shaped coil, the axially open end of one flange portion of a core having flange portions at both ends is provided with flange portions spaced apart from each other. with two electrode terminal plates protruding in the radial direction attached, and the flange portion on the side to which the electrode terminal plates are not attached is held by the gripping part of the automatic winding machine.

The open end of the winding is electrically connected to a groove formed in a portion protruding radially from the flange portion of one electrode terminal plate, and the winding is wound around the core the required number of times. The method is characterized in that the wire is cut and its end is electrically connected to the groove of the other electrode terminal plate, and then the core is subjected to a required molding process.

Since two electrode terminal plates are pasted on one side of the working core (this configuration allows the chip-type coil of the present invention to be placed vertically, whereas conventional axial-type coils are placed horizontally), automatic winding is possible. Chucking onto the machine (grasping onto the gripping section) becomes easier. Furthermore, by forming the tying groove in the electrode terminal plate, it becomes easy to tack the ends of the winding wire onto the electrode terminal plate. Furthermore, the winding does not protrude from the electrode terminal plate, and the coil mounting surface can be made flat. Furthermore, since the process of bending and crushing the lead terminals into flat terminals is also eliminated, the reliability of the chip-shaped coil is also improved.

EXAMPLE Next, the chip-shaped coil according to the present invention will be described below with reference to the accompanying drawings in relation to a method for manufacturing the same.

The first drawing is an explanatory diagram of the manufacturing process of a chip-shaped coil according to an embodiment of the present invention. As shown in FIG. 1(a), both ends of the cylindrical ferrite core 20 are enlarged in diameter to form flanges 20a and 20b, respectively.
An annular W420 c (only one of which is shown) concentric with the core 20 is carved in each axially open end of the core 20b.

Prior to winding the winding 26 around the core 20 having such a shape using an automatic winding machine, adhesive 23 is filled in the annular groove 20c at symmetrical positions across the axis of the core 20. and,
As shown in FIG. 1(b), the two electrode terminal plates 21 and 22 are attached to the adhesive-filled areas and allowed to dry, thereby fixing the electrode terminal plates 21 and 22 to the core 20.

As shown in FIG. 1, on the back surfaces of the electrode terminal plates 21 and 22 (the side opposite to the adhesive surface with the core 20), there are grooves 2 for the respective construction strips.
1a and 22a are engraved, and the electrode terminal plate 21.22
When attached to the flange 20a, each groove 21a,
22a is set to be located outside the outer periphery of the flange 20a. When winding the winding 26 around the core 20, the grooves 21a and 22a are used to immovably attach the ends 26a to the electrode terminal plates 21 and 22, and also allow the winding 26 to be attached to the electrode terminal plate It functions to prevent it from protruding to the back side of 21 and 22.

In the step of bonding the core 20 and the electrode terminal plates 21.22, the annular groove 20c provided in the core 20 is filled with the adhesive 23, so no matter which position is selected, the electrode terminal plates 21.22
The bonding conditions will be the same. Moreover, since the excess adhesive 23 filled in the annular groove 20c spreads along the groove 20c, the adhesive 23 can be prevented from protruding from the flange 20a. Furthermore.

By providing the annular grooves 20c in both flanges 20a and 20b, it is possible to decide which flange is to be attached to the electrode terminal plate. Therefore, automation of the electrode terminal adhesion process becomes easy.

Note that providing the annular groove 20C in the flange 20a (20b) is not an essential requirement of the present invention;
The end of a (20b) may be flat. Also,
The electrode terminal plates 21, 22 may be attached to the core 20 by soldering.

After the electrode terminal board adhesion process described above is completed, the next step is a winding process using an automatic winding machine. In this winding process, as shown in Figure 2 (
As shown in a), the flange 20b of the core 20 to which the electrode terminal plates 21 and 22 are not bonded is gripped by the gripping part 24 of the automatic winding machine.

Next, as shown in FIG. 2(b), the open end 26 of the first winding 26 is
a into the groove 21a of the electrode terminal plate 21, and then rotate the first gripping part 24 to attach the winding 26 to the core 20.
Wind the required number of times. Note that a configuration may be adopted in which the grip portion 24 is fixed and the winding 26 is rotated around the core 20. After winding the winding wire 26 of a predetermined length, the winding RIA 26 is cut at a necessary location and is tied to the end portion 26at and the tie groove 22a portion of the electrode terminal plate 22. Then, by soldering the above-mentioned barbed portion, the electrode terminal plate 21
22 and the wire winding 26 (see FIG. 2(c)).

After the 5-winding process is completed as described above, the next step is a resin molding process. FIG. 3 is a perspective view of the chip-shaped coil after resin molding. As shown in this Figure 3,
? l! The outer end surfaces of the terminal plates 21 and 22 are exposed, and all other parts are molded with resin 25. At this time, the winding 26 with the wire 11 wrapped around the electrode terminal plate 21.22 faces into the grooves 21a and 22a of the electrode terminal plate 21.22, so that the mounting surface (bottom surface) of the chip-shaped coil is exposed. Can be done flat.

Effects of the Invention As described above, the chip-shaped coil according to the present invention has a groove formed in the pair of electrode terminal plates disposed at one axial end of the core, making it easy to automate manufacturing. Moreover, the quality and reliability of the products are excellent.

In addition, according to the manufacturing method of the present invention, it is possible to wind the winding wire around the electrodes at both ends while the core is gripped by the gripping part of the automatic winding machine, thereby reducing the number of manufacturing steps and improving manufacturing efficiency. It is possible to improve the

[Brief explanation of drawings]

Figures 1 (a) and (b) are explanatory diagrams of the electrode terminal board adhesion process in the manufacturing process of a chip-shaped coil according to an embodiment of the present invention, and Figures 2 (a) and (c) are An explanatory diagram of the winding process,
Figure 3 is an explanatory diagram of a molded chip-shaped coil;
FIGS. 4(a), 4(b) and 4(c) are explanatory views of the manufacturing process of a conventional axial coil. 20... Ferrite core 20a, 20b... Flange 21.22... Electrode terminal plate 21a, 22a... Karaoke groove 25... Mold 26a... End portion 26... Winding wire

Claims (1)

[Scope of Claims] [1] A core (20) having flange portions (20a, 20b) at both ends, the winding (26) wound around the core (20) and the one flange portion. The grooves (21
two electrode terminal plates (21, 22) to which the two ends (26a, 26a) of the winding (26) are electrically connected, respectively, via the core (20); and winding wire (26) and two electrode terminal plates (
21, 22) and a molded resin (25) that is integrated with the molded resin (25). [2] An annular groove (20c) is carved in the open end of the flange portion (20a, 20b), and the electrode terminal plate (21, 22) is filled with adhesive (23) or solder in this annular groove (20c). 2. The chip-shaped coil according to claim 1, further comprising: attached thereto. [3] Two electrode terminal plates (21) are spaced apart from each other and protrude in the radial direction at the axially open end of one flange portion (20a) of the core (20), which has flange portions (20a, 20b) at both ends. , 22), and the flange part (20b) on the side where the electrode terminal plate (21, 22) is not attached is attached to the grip part (24
), hold the open end (26a) of the winding (26).
) on the flange part (20a) of one electrode terminal plate (21)
) is bored in the part protruding in the radial direction from the groove (2
1a), and after winding the winding (26) around the core (20) a required number of times, the winding (26) is cut and the end (26a) is connected to the other electrode terminal plate. (22) A method for manufacturing a chip-shaped coil, characterized in that the core (20) is electrically connected to the groove (22a), and then the core (20) is subjected to a required molding process. [4] Flange portion (20) in the core (20)
An annular groove (20c) is formed at the open end in the axial direction of the flange portion (20a, 20b) by filling the annular groove (20c) with adhesive (23) or solder. 4. The method for manufacturing a chip-shaped coil according to claim 3, characterized in that: 21, 22) are attached.