JPS6225855Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a fixed inductor used as an inductance element in various electrical devices, and in particular, the present invention relates to a fixed inductor used as an inductance element in various electrical devices, and in particular, to a terminal of a winding wire wound around a bobbin made of ferrite material, and a terminal fixed to the bobbin. This is related to the connection structure.

1 and 2 show an example of a conventional fixed inductor, and in the figures, 1 is a drum-shaped bobbin on which a winding 2 is provided. A hole 1b is formed in the lower part of the flange 1a at both ends of the bobbin 1, and a terminal 3, one end of which is inserted into the hole 1b, is fixed to the bobbin 1 with an adhesive (not shown) filled in the hole 1b. ing. The terminal 2a of the winding 2 is twisted and soldered to the base of the terminal 3.

However, the terminal 3 is easily bent during the characteristic testing process or during transportation, and bending force is often applied when the terminal 3 is inserted into a mounting hole of a printed circuit board. As a result, especially in the case of a small inductor with a thin winding wire material, excessive tension is applied to the terminal 2a connected to the terminal 3, and wire breakage often occurs, especially near the part tied to the terminal 3.

In order to prevent wire breakage at the ends of the winding due to such terminal bending, grooves 1c are formed at both ends of the bobbin 1 as shown in FIG. Conventionally, attempts have also been made to construct an inductor in which a portion of the inductor protrudes from the bobbin 1. In this case, the terminal 2a of the winding 2 is connected to the bobbin 1.
Since it is connected to the upper end of the terminal 3 which slightly protrudes from the terminal 3, it is not easily affected by the bending of the terminal 3. However, when assembling this type of inductor, the terminal 2a
The upper end of the terminal 3 is made to protrude a little longer in advance so that it can be easily tangled, and on the other hand, since the product is desired to be as small as possible, the excess length is cut off after soldering. In this cutting step, there was a drawback that the terminal 2a was easily broken.

The present invention was developed in order to eliminate the above-mentioned drawbacks of the conventional technology.By connecting the end of the winding and the terminal at a portion other than the base of the terminal, it is possible to create an inductor that is less prone to disconnection. The purpose is to provide. An embodiment of the present invention will be described below with reference to FIGS. 4 to 7.

4 and 5 show the bobbin in this embodiment. The bobbin 10 is made of ferrite material and has a drum shape with flanges 12 at both ends. A groove 14 is provided on the side surface of the flange 12 to cross the center thereof, and openings 14a at both ends of the groove 14 are formed in a fan shape that widens as they approach the edge of the flange 12. and flange 12
A notch 16 is provided on the edge of the opening 14a.

FIG. 6 shows an inductor assembled using this bobbin 10, where 20 is a winding wound on the bobbin 10, and 30 is a terminal fixed to the flange 12 of the bobbin 10. The terminal 30 has a protrusion 30a that protrudes downward from the bobbin 10, and a groove 1 of the bobbin 10.
4, and a fixing part 30b fixed in the inside. The fixing part 30b of the terminal 30 is inserted into the groove 14 and then fixed to the bobbin 10 with an adhesive (not shown), but a part of the fixing part 30b is not covered with adhesive or the like and is exposed. is being done. As is clear from FIG. 7, the end 20a of the winding 20 is brought into contact with the exposed portion of the fixed portion 30b of the terminal through the opening 14a from the notch 16 provided with the flange 12, and then the terminal 20a is brought into contact with the exposed portion of the fixed portion 30b of the terminal. This tethered portion and the contact portion between the terminal 20a and the fixing portion 30b are each soldered.

Since the fixed inductor according to the present invention has the above-described configuration, even if the end of the winding wire breaks near the part where it connects to the terminal due to the bending force acting on the terminal, the end of the winding wire can be disconnected. The connection between and the terminal is
It is held by another connecting part provided on the fixed part of the terminal.

The present invention can also be applied to an inductor of the type shown in FIG. 3 as a conventional example, that is, an inductor in which both ends of the terminal protrude from the bobbin and the end of the winding is wrapped around the protrusion at the upper end of the terminal. Can be applied. In that case, for example, contrary to the above embodiment, the end 20a of the winding wire is guided upward through the opening 14a provided below the bobbin 10, and is brought into contact with the fixed part 30b of the terminal on the way. Terminal 3 protruding above the bobbin 10 from
0, the winding terminal 20a and the fixing part 30
What is necessary is to solder the contact portion with b and the tangled portion between the winding terminal 20a and the upper end of the terminal.
A fixed inductor with such a configuration has winding terminal 2
Since the terminal 0a is not attached to the protrusion 30a of the terminal that protrudes below the bobbin 10, there is no risk of disconnection when the terminal is mounted on a printed circuit board. Furthermore, even if the winding end 20a is accidentally disconnected during the process of cutting off the excess part of the upper end of the soldered terminal by twisting the winding end 20a, even if the winding end 20a is accidentally disconnected from the fixed part of the terminal. 30b
Since the winding terminal 20a and the terminal 30 are also soldered, the electrical connection between the winding terminal 20a and the terminal 30 is ensured.

According to the present invention, a fixed inductor with very few disconnection accidents can be obtained by simply changing the structure.

In addition, since the wire does not break even when the terminal is bent, it can be applied to a fixed inductor mounted on a printed circuit board using an automatic insertion machine, resulting in great practical effects.

[Brief explanation of the drawing]

Fig. 1 is a perspective view of a conventional inductor, Fig. 2 is a partially sectional front view of the same, Fig. 3 is a partially sectional front view showing another conventional example, and Figs. 4 to 7 are of the inductor according to the present invention. 4 is a perspective view of the bobbin, FIG. 5 is an enlarged side view of the bobbin, FIG. 6 is a perspective view of the inductor, and FIG. 7 is an enlarged side view of the main parts. . DESCRIPTION OF SYMBOLS 10... Bobbin, 20... Winding wire, 20a... Terminal of winding wire, 30... Terminal, 30a... Projection part, 3
0b...Fixed part.

Claims (1)

[Scope of utility model registration request] A bobbin made of a ferrite material with wire wound thereon, a terminal having a fixed part fixed to the bobbin and a protruding part protruding from the bobbin, and the fixed part of the terminal is placed in a groove formed on the surface of the bobbin. 1. A fixed inductor characterized in that the inductor is fixed by adhesive or the like, and the terminal end of the winding wire is soldered to the exposed part of the fixing part and connected to the protruding part of the terminal.