JPH0211770Y2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to the structure of small electronic components such as pulse transformers, wideband transformers, delay lines, etc., in which the element body is formed using windings and the leads are connected to external terminals. .

As shown in the cross-sectional view of FIG. 1, a conventional electronic component of this type stores an element body 2 wrapped in an elastic protective material inside a case 1, and wraps it around an external terminal 3 fixed to the case 1. A structure in which the wire leads 4 are connected and the entire structure is sealed with resin is common. The one-dot chain line shows the external shape when dual in-line packaging is used. FIG. 2 is a plan view of FIG. 1. However, since the leads of the element body 2 are twisted and connected to the external terminals 3, it is difficult to automate the assembly. Furthermore, when there are many leads connected from the element body 2 to the external terminals, the leads 4 are connected to the external terminals in a crossed state as shown in Fig. 2, which tends to cause short circuits and disconnections, especially during assembly, making it difficult to implement automation. It's causing a lot of trouble. This situation occurs even more frequently when a plurality of element bodies 5, 6 are housed as shown in the plan view of FIG.

The purpose of the present invention is to overcome these conventional drawbacks and provide a structure of a small electronic component suitable for automation.

In the present invention, the wound element body is wrapped with an elastic protective material provided with a locking part, and the locking part is attached to a fixing means provided on the board, and the side of the board is connected from the fixed part of the external terminal. A cut groove extending inside the board is formed to insert the winding lead, and a conductor pattern is provided both in the fixed part and around the cut groove to connect the external terminal and the element body to the conductor. In small electronic components that are connected via patterns and are entirely resin-sealed with external terminals exposed, the conductor pattern around at least one notch is separate from the fixed part following that notch. It is characterized in that it is connected to the conductor pattern around the fixed part.

Hereinafter, a pulse transformer will be described as an example, with reference to FIGS. 4, 5, and 6 showing embodiments of the small electronic component of the present invention. FIG. 4 is a front view with the resin used for sealing removed, FIG. 5 is an exploded perspective view, and FIG. 6 is a partial plan view of the substrate showing the conductor pattern.

First, in FIGS. 4 and 5, 10 is an elastic protective material made of silicone rubber or the like that encloses a toroidal core 11 around which a winding wire is wound, 12 is a flat rectangular substrate made of synthetic resin, 13 is an external terminal. A through hole 14 is formed in the center of the substrate 12, and a vertical portion 1 of an external terminal is formed on the opposite side.
A recess 16 is formed for fitting and fixing 5. There are four recesses 16 on one side, and each recess 16 has a narrow groove 17 extending inside the substrate 12. This cut groove 17 serves to sandwich the lead 18 of the winding of the toroidal core 11. Note that the material of the substrate 12 may be ceramic.

The shape of the elastic protective material 10 is approximately a rectangular parallelepiped,
A locking portion 20 is provided on one side. The locking portion 20 protrudes from one surface in a cylindrical shape and has a wide tip end shaped like a flange, and the flange-shaped portion is made slightly wider than the size of the through hole 14 of the substrate 12. The tip of the locking portion 20 is elastically deformed and passed through the through hole 14 to attach the substrate 12.
The elastic protective material 10 surrounding the toroidal core 11, which is the main body of the element, is fixed to the back surface by exposing it to the front surface. Note that the shape of the elastic protective material may be cylindrical in accordance with the shape of the toroidal core 11.

Conductive patterns as shown in FIG. 6 are formed around the recess 16 and groove 17 shown in FIG. 5, respectively. FIG. 6 shows the state of the conductor pattern on the left side of FIG. 5, and the right side is symmetrical with the left side. In FIG. 6, for convenience of explanation, each of the four recesses 16, four grooves 17, and four leads 18 in FIG.

The conductor pattern 21A around the kerf 17A connects to the conductor pattern 22B around the recess 16B, and the conductor pattern 21B around the kerf 17B connects to the recess 16.
Connect to the conductor pattern 22A around A. Similarly, the conductor pattern 21C around the kerf 17C is connected to the conductor pattern 22D around the recess 16D, and the conductor pattern 21D around the kerf 17D is connected to the conductor pattern 22C around the recess 16C. In other words, the conductor pattern around the kerf is connected to a conductor pattern around a recess different from the recess to which the kerf continues. Leads 18A and 18B of the winding 23, which are represented by equivalent symbols, are respectively kerf 1.
7A and the kerf 17B, and the leads 18C and 18D of the winding 24 are inserted into the kerf 17C and the kerf 17D, respectively. The leads inserted into the grooves are each soldered to the surrounding conductor patterns.
Lead 18A and lead 18B are respectively recessed part 16B,
The leads 18C and 18D are connected to the external terminals 13 fixed to the recesses 16A by soldering or welding through conductor patterns, and the leads 18C and 18D are connected to the recesses 1, respectively.
6D, and is connected to the external terminal 13 fixed in the recess 16C via a conductor pattern.

FIG. 7 is a partial plan view of a substrate showing another embodiment of a conductive pattern formed on the substrate, and similarly to FIG. 6, the left side of FIG. 5 is shown.

The conductor pattern 31A around the kerf 30A is connected to the conductor pattern 33C around the recess 32C, and the conductor pattern 34 around the kerf 30B and the recess 32B is connected to the conductor pattern 33C around the recess 32C.
are becoming one. Further, the conductor pattern 31C around the kerf 30C is connected to the conductor pattern 33D around the recess 32D, and the conductor pattern 31D around the kerf 30D is connected to the conductor pattern 3 around the recess 32A.
Connect to 3A.

In the small electronic component of the present invention, a groove is formed from the side of the board to which the external terminal is fixed, and the leads of the element body inserted into the groove are connected to the external terminal via the conductor pattern. However, the conductor pattern around the kerf may be connected to the conductor pattern around the recess following the kerf, such as the conductor pattern 34 in FIG. 7, or the conductor pattern 21A or 31A.
Connect to the conductor pattern around the recess, which is different from the recess following the kerf. Therefore, if the position of the external terminal is specified by the customer's specifications and is located away from the leads on the element body, or if the leads are located at a position where the leads intersect when directly connected to the external terminal. However, because the conductor pattern can be designed freely, the leads never cross. Although the external terminals 13 are present at the positions where the leads 18A and 18B and the leads 18C and 18D intersect in FIG. 6, they can be pulled out straight from the element body and inserted into the grooves without intersecting.

The small electronic component of the present invention does not need to be connected to external terminals by twisting the leads of the device body, and the leads do not cross each other. Therefore, assembly work is simplified and suitable for automation.

Note that the present invention is not limited to the examples. For example, although a recess is provided on the side of the substrate to which the external terminal is fixed, it is not necessary to provide a recess if the tip of the external terminal is kept horizontal and is fixed on the conductor pattern. Of course, there may be a plurality of element bodies wrapped with an elastic protective material. In addition, although the explanation has been given by taking as an example a pulse transformer whose element body is a toroidal core wound with wire, there is no need to limit the content structure of the element body, and there are various types in which at least a part of the element body is constructed using winding It is clear that the present invention can be applied to small electronic components.

[Brief explanation of the drawing]

1 and 2 are a sectional view and a plan view, respectively, of a conventional small electronic component, FIG. 3 is a plan view of another conventional small electronic component, and FIG. 4 is an embodiment of the small electronic component of the present invention. 5 is an exploded perspective view of FIG. 4,
FIG. 6 is a partial plan view of the substrate for showing a conductive pattern, and FIG. 7 is a partial plan view of the substrate for showing another embodiment of the conductive pattern. 10: Elastic protective material, 11: Toroidal core, 1
2: Board, 13: External terminal, 14: Through hole, 1
6, 16A, 16B, 16C, 16D: recess, 1
7, 17A, 17B, 17C, 17D: Cut groove, 2
1A, 21B, 21C, 21D, 22A, 22
B, 22C, 22D: Conductor pattern, 18, 18
A, 18B, 18C, 18D: Lead, 20: Locking part.

Claims (1)

[Scope of utility model registration request] The wound element body is wrapped with an elastic protective material provided with a locking part, and the locking part is attached to a fixing means provided on the board. A cut groove extending inside the board is formed to sandwich the lead of the circuit board, and a conductor pattern is provided both in the fixed part and around the cut groove, and the conductor pattern is used to connect the external terminal and the element body. At least one small electronic component that is connected via a
A small electronic component characterized in that a conductor pattern around one cut groove is connected to a conductor pattern around a fixed part different from a fixed part following the cut groove.