JPS636824A - Manufacture of chip inductor - Google Patents

Abstract

PURPOSE:To improve the productivity of a chip inductor by securing a core to a terminal frame formed with a projection corresponding to a pair of metal plate terminals, temporarily clamping a winding at the projections, and winding it on the core, thereby continuously winding it. CONSTITUTION:A coil core 1 is mounted in the recess of a pair of metal plates 3 having an arcuate recess and projection 4 at the end. The pair of metal plates 3 are coupled with a metal plate terminal frame 5, and a coil lead temporarily clamping projection 6 is formed at the metal terminal frame 5. A coil lead 7 led from the through hole of a winding machine nozzle 20 is wound on one side projection 6 to be temporarily clamped, disposed fixedly along the lower surface of the projection 4 of the end of the terminal, the winding 2 is wound by winding it on the core 1, engaged with the projection 4 of opposite side through the lower surface, and wound fixedly on the projection 6. Thereafter, the projection 6 is coated with a cream solder, and the lead 7 is connected by a soldering iron to the plate 3.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a method of manufacturing leadless chip inductors used in various electronic devices.

2. Description of the Related Art In recent years, advances in high-density surface mounting technology and reflow soldering technology have led to rapid advances in the miniaturization and multifunctionality of electronic devices. The various electronic components used in these devices are required to be ultra-small, highly reliable, and low-cost by being made into chips.

A conventional method for manufacturing a leadless chip inductor will be described below with reference to the drawings.

The manufacturing process includes winding, terminal installation, coil lead wire connection,
Exterior molding and terminal shaping are performed, and FIG. 5 shows how the wound coil element is attached to the terminal.

The coil element is constructed by winding a wire 12 around a coil magnetic core 11 made of a drum core or the like, and is fixed with an adhesive or the like so as to cross over the upper surfaces of opposing ends of a pair of terminals 13 made of metal plates. However, a plurality of terminals 13 are arranged in a row, and both outer ends are connected by a connecting portion 19, so that badge production in the form of strips or continuous production in the form of long hoops is achieved.

FIG. 6 shows how the coil lead wire 14 is joined to the terminal 13. The tip of the coil lead wire 14 is wound around a temporary fixing pin 17 provided on a winding device or a winding jig for each individual coil and temporarily fixed, and then the coil lead wire 14 and the terminal 13 are sandwiched by a connecting electrode 18. The coil lead wire 1 can be welded by the electrode 18 which has been applied with cream solder (not shown) on the terminal 13 and heated.
4 and terminal 13 are sandwiched and soldered.

After that, after cutting the extra wire of the coil lead wire 14, a part of the terminal 13 including this connection part and the coil element are externally molded with resin or the like, and the connecting part 19 of the terminal 13 is cut off, and the terminal is led out from the external molded body 16. 13 is bent and shaped along the exterior molded body 16 to form a completed product.

FIG. 7 shows a transparent perspective view of the completed product. In the figure, 15 is a connecting portion between the coil lead wire 14 and the terminal 13, and 16 is an exterior molded body.

Problems to be Solved by the Invention In the method for manufacturing a chip inductor as described above, it is not possible to wind the coil continuously, and in order to maintain the winding state of the coil magnetic core 11, a self-fused copper wire is used. In addition, a step of fusing the coil wire 14 and the terminal 13 after winding is necessary.
It is necessary to temporarily fix the coil lead wire 14 when joining.
Productivity is poor and costs are high. In addition, as shown in FIG. 6, it is necessary to loosen the coil lead wire 14 by moving the temporary fixing pin 17 in order to prevent the wire from breaking when the coil lead wire 14 and the terminal 13 are sandwiched between the electrodes 1B. 14
If the bonding position 15 is loosened, the bonding position 15 is not constant, resulting in variations during mass production, and it is difficult to obtain sufficiently stable bonding reliability.

The present invention aims to eliminate the above-mentioned conventional drawbacks and provide a highly reliable chip inductor at low cost.

Means for Solving the Problems In order to solve the above-mentioned problems, the present invention provides a terminal frame in which a plurality of opposing pairs of metal plate terminals are lined up and connected to a metal plate terminal frame portion, and Providing a protrusion corresponding to the metal plate terminal on the metal plate terminal frame portion of the terminal frame,
The coil magnetic core of the coil element is fixed to each of the upper hakama of the opposing tips of the metal plate terminals, and the windings are heated while being temporarily fastened with the protrusions, and then attached to each of the metal plate terminals. This method is characterized in that the coil lead wire of the winding is connected and the metal plate terminal is separated from the metal plate terminal frame.

Effects According to the method for manufacturing a chip inductor, continuous winding is possible on a terminal frame in which a large number of metal plate terminals are arranged, and the terminal frame has a protrusion for temporarily fixing the coil lead wire. This eliminates the need for a mechanism for temporarily fixing the coil lead wire in the winding machine, and the winding machine can be simplified.

Further, since the coil lead wire is temporarily fixed to the protrusion, the connection with the metal plate terminal can be stably performed, so that the reliability of the connection is also high.

Example An embodiment of the present invention will be described below with reference to the drawings.

The manufacturing process is performed in the following order: attachment of the coil core, winding, joining of the coil lead wire, exterior molding, and terminal shaping. FIG. 1 shows the terminal frame after winding. In the figure, 1 is a coil magnetic core such as a drum core, 3 is a metal plate terminal consisting of a pair of metal plates, and has an arc-shaped concave portion at its tip to hold the coil magnetic core 1, and 4 is a metal plate terminal that faces the metal plate terminal 3. The protruding part 5 provided at the tip and having a width narrower than the fixed end of the coil magnetic core 1 and having a partially concave notch 4a is a metal plate terminal frame part that connects a plurality of metal plate terminals 3, and serves as a terminal. It makes up the frame. Reference numeral 6 indicates a protrusion provided on the metal plate terminal frame portion 6 for temporarily fixing a coil lead wire, and 7 indicates a coil lead wire.

Figure 2 shows each step up to this winding state.
-d is shown in order. 20 in the figure is a nozzle of a winding machine, and the enamelled copper wire is pulled out from a through hole provided in the center of this nozzle 2o. Figure 2a shows a state in which the coil lead wire 7 is wound around one of the protrusions 6 and temporarily fixed.Next, the nozzle 20 is moved and the coil lead wire 7 is wrapped around the protrusion at the tip of the terminal as shown in Figure 2A. Hook it on the underside of 4 and fix it. In this state, the nozzle 20 is rotated around the coil magnetic core 1 to perform a winding operation to apply the winding 2 to the coil magnetic core 1, and as shown in FIG. After hooking the leader wire 7 and passing through the lower surface of the protrusion 4 at the tip of the terminal, the protrusion e is shown in FIG. 2d.
to fix the coil lead wire 7.

FIG. 3 shows how the coil lead wire 7 of the coil element that has been wound is connected to the metal plate terminal 3. The connection is made on the lower surface of the protrusion 4 provided at the tip of the metal plate terminal 3, by applying cream solder 8 using a dispenser or pin transfer, and applying a soldering iron 21 to the solder. Thereafter, the excess wire portion of the coil lead wire 7 is cut and removed, and a part of the metal plate terminal 3 including the connection portion and the wound coil magnetic core 1 are molded with epoxy resin or the like, and the metal plate terminal frame portion 5 is cut. The metal plate terminal 3 drawn out from the exterior molded body 9 is bent and shaped along the product outer shape to form a finished product.

FIG. 4 is a transparent perspective view showing the completed state of the chip inductor produced as described above. In the figure, numeral 9 indicates an exterior molded body, but for convenience of explanation, the inside is transparent.

Effects of the Invention As is clear from the above explanation, the chip/chip according to the present invention
The method for manufacturing an inductor is to connect a plurality of pairs of opposing metal plate terminals to a metal plate terminal frame to form a terminal frame, and to make the metal plate terminal frame of the terminal frame correspond to the metal plate terminals. After that, a coil core of a coil element is fixed to each of the upper surfaces of the opposing tips of the metal plate terminal, and then windings are sequentially applied to the coil core while being temporarily fixed with the protrusion. , the coil lead wire of the winding is connected to each of the metal plate terminals, and the metal plate terminals are separated from the metal plate terminal frame.
The inductor production process can be directly connected with a continuous terminal frame, greatly improving production efficiency and reducing costs. In addition, all the coil lead wires are temporarily fixed at the protrusions, so there is no chance of the wires coming loose or unwinding.Therefore, there is no need to use costly self-bonding copper wires, and regular enamelled copper wires can be used. It is. In addition, the winding machine does not require a temporary fixing function for the coiled copper wire, which simplifies the process.Furthermore, the connection between the coil lead wire and the metal plate terminal is fixed in the second half when the coil lead wire is hooked to the metal plate terminal. The position of the coil lead wire is stable because of the date, and the reliability of the connection is high, and its industrial effects are outstanding.

[Brief explanation of drawings]

Fig. 1 is a perspective view showing the manufacturing state of a chip inductor after winding in an embodiment of the present invention, Fig. 2 is a perspective view showing the order of winding, and Fig. 3 is a coil copper wire and a terminal. Figure 4 is a transparent perspective view showing the internal state of the completed chip inductor. Figure 5 is a conventional example in which the wired coil core of the conventional chip inductor is used as a terminal. FIG. 3 is a transparent perspective view showing the inside of the chip inductor in a completed state. 1... Coil magnetic core, 2... Winding wire, 3...
...Metal plate terminal, 4...Protrusion, 6...
...Metal plate terminal frame, 6...Protrusion, 7.
... Coil leader wire, 8 ... Cream solder, 9 ... Exterior molded body, 20 ... Winding nozzle of winding machine, 21 ... ...Soldering iron. Name of agent: Patent attorney Toshio Nakao (1st person)
Figure 2 Figure 3 Figure 4 Figure 5 Figure 6 Figure 7

Claims (1)

[Claims] A terminal frame is formed by connecting a plurality of opposing metal plate terminals to a metal plate terminal frame, and a protrusion corresponding to the metal plate terminal is provided on the metal plate terminal frame of the terminal frame. , a coil magnetic core of a coil element is fixed to each of the upper surfaces of the opposing tips of the metal plate terminal, and then windings are sequentially applied to the coil magnetic core while being temporarily fixed with the protrusion, and then the metal plate terminal A method for manufacturing a chip inductor, in which a coil lead wire of a winding is connected to each, and a metal plate terminal is separated from a metal plate terminal frame.