JPH048927B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field] The present invention relates to a composite electronic component constructed using a large number of coils, such as a delay line or an LC filter.

[Prior art and its problems]

Composite electronic components that use many coils, such as delay lines and LC filters, have many drum-shaped cores with coils wound around them placed on a printed circuit board, and are connected to other circuit elements such as capacitors and resistors. It will be done. Connections between coils and other circuit elements can be achieved by reducing the area occupied by a large number of cores on the board;
Lead wires are often connected to a conductor pattern on a straight board from the standpoint of making it easy to pull out the tap and easily adjusting the coupling between the coils depending on their mutual positional relationship. An electrode is formed in advance on the flange of the core, and connection to other circuit elements is not made through this electrode which is connected to the conductor pattern.

Therefore, a large number of lead wires are hollow and cluttered, and breakage of the lead wires is likely to occur, and such wiring work is also troublesome and requires a lot of man-hours.

Of course, it is also possible to wind a large number of coils around a common core and pull out the lead wire, but since the lead wire cannot be twisted and fixed, it is inconvenient when pulling out the lead wire from a tap, and the lead wire cannot be pulled out. The wires are connected directly to the conductor pattern on the board.

Electrodes can also be formed by printing on the flange of the core or by fixing a single plate-shaped metal piece.
The lead wires are still directly connected to the conductive pattern because they cannot be twisted or because they are located on the surface where the conductive pattern and the electrode come into contact and are easily broken.

〔the purpose〕

An object of the composite electronic component of the present invention is to eliminate hollow wiring of lead wires in such a composite component using a large number of coils so that the lead wires can be tied and fixed. The purpose is to reduce the number of assembly steps and to improve the reliability of the connection between the coil and other circuit elements.

[Technical means to solve problems]

In the composite electronic component of the present invention, a plurality of coils and other circuit elements are arranged on the main surface of a substrate to form a circuit, and the whole is sealed with resin with external terminals connected to the circuit exposed. In a composite part, the coil has a winding groove separated by three or more flanges arranged in parallel, and the flanges have at least two winding grooves bent at approximately right angles along the direction in which the side surfaces of the flanges extend. It is characterized in that metal pieces consisting of sides are wound around a common core, which forms electrodes by fixing them to the sides, except for the ends to which the lead wires of the coil are connected.

〔Example〕

The following is a first example showing a composite electronic component of the present invention.
This will be explained with reference to FIGS. FIG. 1 is a front view, and FIG. 2 is an exploded perspective view with the external terminals shown in FIG. 1 removed.

In Figures 1 and 2, 1 is a printed circuit board made of glass epoxy resin, 2 is a core around which multiple coils are wound, 3 is a metal piece that serves as an electrode, and 4 is a circuit such as a capacitor or a resistor, excluding the coils. Motoko, 5
is an external terminal.

An enlarged side view and a front view of the core 2 are shown in FIGS. 5 and 6, respectively, and the core 2 has a winding groove 7 separated by five parallel flanges 6. A metal piece 3 is fixed to the collar 6.

The metal piece 3 has three sides bent at right angles along the direction in which the side surface 8 of the tsuba 6 extends, and is bonded to the side surface 8 with these three sides sandwiching the circular tsuba 6 from below and from the sides. It is fixed with agent 14. Both ends 9 are bent at right angles in the direction away from the collar 6 so that the lead wire 10 can be wrapped around them as shown in FIG. The entire body is shaped approximately in a U-shape.

The groove 11 on the upper side of the side surface 8 serves to pass a lead wire connecting another coil between the winding grooves 7. Also,
The groove 12 on the side fits into the protrusion 13 of the metal piece 3,
It facilitates positioning when fixing the metal piece 3 as an electrode, and serves to temporarily fix the metal piece until the adhesive 14 hardens. Then, the side 15 of the metal piece 3 is directly surface-connected to the conductor pattern of the substrate 1, and the connection with the circuit element 4 is established. It is also possible to connect the end portion 9 to the conductor pattern, but since the lead wire will be located on the connection surface, it is better to connect it at the side 15 to ensure that there will be no disconnection.

External terminals 5 fit into the grooves 16 on both sides of the substrate 1, and the circuit formed on the substrate 1 is drawn out. The part surrounded by the dotted line in FIG. 1 is the part to be sealed with resin. The conductor pattern formed on the substrate 1 including the circumference of the groove 16 of the substrate 1, the position where the circuit element 4 and the core 2 around which the coil is wound, and the core wound around the core 2 are Illustrations are omitted.

FIG. 3 is a front view showing another embodiment of the composite electronic component of the present invention, and the same parts as in FIGS. 1 and 2 are given the same reference numerals.

On the front surface of the printed circuit board 20, a core 2 around which a coil is wound and a circuit element 4 are arranged to form a circuit as shown in FIGS. 1 and 2. This circuit also has through holes on the back surface. The integrated circuit 21 of the flat package as shown in the plan view of FIG. 4 is connected on the back side. The terminals 22 of the integrated circuit 21 are bent along the sides of the flat package and are surface-connected to the conductor pattern on the back side.

Such a configuration is used when configuring a composite component in which a delay line is connected to a saturation type logic circuit such as TTL.

FIGS. 7 and 8 are a front view of a core to which a metal piece of a different shape is fixed to serve as an electrode, and a partial side view of a collar.

The metal piece 31 is divided into two pieces by one collar 32, forming two electrodes. Each metal piece 31 is formed into an L shape and has two sides bent at right angles along the direction in which the side surface 33 extends, and each side is attached to the side and bottom of the side surface 33 with adhesive 14. It will stick. The lower side of the side surface 33 of the circular collar 32 is flattened to increase the contact area with the metal piece 31. The upper end 34 of the metal piece 31 is not bent like the metal piece 3, but is spaced apart from the collar 32 so that the lead wire 36 can be wrapped around it. A groove 35 is provided at the tip, and by passing the lead wire 36 through the groove 35 once as shown in FIG. 8, it can be locked and temporarily fixed, which is convenient when pulling out the tap. The grooves 11 and 12 play the same role as the core 2.

FIG. 9 is a partial perspective view of a core to which metal pieces of still another shape are fixed.

An L-shaped metal piece 43 having an upper end 42 bent is fixed to each collar 41 of the core 40 .
The metal piece 43 has two sides bent at right angles along the direction in which the side surface 44 of the collar 41 extends, and these two sides are fixed.

The metal pieces 43 are fixed alternately from opposite sides of the adjacent collars 41, such as from the stone side of the side surface 44 and from the left side. A lead wire connects to end 42.

The position, shape, and number of metal pieces to which the metal pieces are fixed can be varied in various ways as described above, mainly depending on the shape and positional relationship of the conductor patterns of the substrates to be surface-connected. It is not necessary to provide an electrode on a collar that does not require an electrode. Of course, core 40 in Figure 9
The metal pieces 43 of adjacent flanges 41 may be fixed from the same side.

FIG. 10, FIG. 11, and FIG. 12 are side views showing modified examples of the shape of the collar of the core.

The core 50 in FIG. 10 has a groove 53 along the side surface 52 of the collar 51, and the core 60 in FIG. 10 has a recess 62 in the side surface 61. These grooves 53 and recesses 62 are
It releases adhesive at the point where the metal piece touches the tsuba and prevents it from flowing out from the sides.

Therefore, depending on the amount of adhesive, the presence of grooves 53 and recesses 62 is of little value in areas where the metal pieces do not come into contact.

On the collar 71 of the core 70 shown in FIG. 12, a metal film 72 is provided by printing and baking on the part that contacts the metal piece, and the metal piece is spot-welded to this metal film 72. In addition, in the case of a circular tsuba, the contacting part of the metal piece is, for example, the part with the horizontal groove 12 of the side surface 8 and the part that contacts the lower side 15, as shown in FIG. In this case, almost all three sides of the tsuba come into contact with the metal piece, so Figure 10 and Figure 1
The shape shown in Figure 1 is effective.

As the substrate, instead of the printed circuit board in the embodiment, a ceramic substrate formed by laminating a capacitor therein may be used.
Alternatively, the integrated circuit may be bonded directly to the substrate.

〔effect〕

As described above, in the composite electronic component of the present invention, a large number of coils are wound around a common core, and an electrode made of a metal piece that can be connected to the coil lead wire is formed on the flange of the core. There is. The lead wire can be easily pulled out by wrapping it around a metal piece, so you can temporarily attach the tap lead wire to the metal piece and continue winding another coil. Because of this simplicity, both the terminal and tap lead wires can be connected to a metal piece serving as an electrode, and can be connected to another circuit element via the metal piece that is surface-connected to the conductor pattern. Therefore, lead wire disconnection accidents can be prevented, the complexity of wiring can be solved, and the man-hours can be reduced.

Of course, since the coils are coaxially wound around a common core, the area occupied by the coils on the substrate is reduced, and the mutual positional relationship between the coils is also constant. Good phase characteristics can be easily obtained by adjusting the coupling between the coils by changing the shape of the core, such as by changing the thickness of the collar or shifting the positions of the winding grooves arranged in a straight line.

[Brief explanation of drawings]

FIG. 1 is a front view showing an embodiment of the composite electronic component of the present invention, FIG. 2 is a perspective view showing the state with external terminals removed, and FIG. 3 is a diagram showing another embodiment of the composite electronic component of the present invention. 4 is a plan view of the integrated circuit, FIGS. 5 and 6 are an enlarged side view and an enlarged front view of the core used in the composite electronic component of the present invention shown in FIGS. 1 and 2, and FIG. The figure is a front view of another core, FIG. 8 is a partial side view of FIG. 7, FIG. 9 is a partial perspective view of yet another core, and FIGS. FIG. 3 is a side view showing a modified example of the shape of FIG. 1: Printed circuit board, 2: Core, 3: Metal piece,
4: Circuit element, 6: Tsuba, 7: Winding groove, 8: Side surface,
9: End, 10: Lead wire, 11, 12: Groove, 1
3: protrusion, 14: adhesive.

Claims (1)

[Claims] 1. A composite component in which a plurality of coils and other circuit elements are arranged on the main surface of a substrate to form a circuit, and the whole is sealed with resin with external terminals connected to the circuit exposed. The coil has a winding groove separated by three or more flanges arranged in parallel, and the flanges include a metal piece consisting of at least two sides bent at approximately right angles along the direction in which the side surfaces extend. 1. A composite electronic component characterized in that the coil leads are wound around a common core having an electrode formed by being fixed to the side surface of the coil except for the end to which the lead wire is connected.