JPH04116109U - Surface mount inductance element - Google Patents

Abstract

(57) [Abstract] [Purpose] To create a surface-mounted inductance element that facilitates the connection of a transformer or coil to the electrode at the end of an insulator board, and also ensures the reliability of the connection even after surface mounting on a circuit board. obtain. [Structure] A plurality of end face electrodes 4a to 4 are provided at the end of the insulator substrate 3.
Through holes 5a to 5 are formed at positions adjacent to these end surface electrodes and are electrically connected to each of the end surface electrodes.
A transformer consisting of a core 1 and a winding 2 is mounted on the insulating substrate 3, and the ends 2a to 2f of the winding are connected to the through holes 5a to 5f.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

This idea relates to a surface-mounted inductance element that can be surface-mounted on a circuit board. do.

0002

[Conventional technology]

BACKGROUND ART Conventionally, a transformer in which a winding is wound around a toroidal or spectacle-shaped ferrite core has been used, for example, in a double-balanced mixer (DBM), a balanced-unbalanced converter, or an impedance converter. In this type of transformer, the length of the winding wound around the core must be sufficiently shorter than 1/4 the wavelength of the signal being handled, and the wavelength of the high-frequency signal propagating through the winding wound around the core is In comparison, it becomes 1/μ ^1/2 . For this reason, transformers for high frequencies have thin wires wound around an extremely small core.

0003 Transformers that use extremely thin windings like this are difficult to handle. Instead, it is required to be a surface mount type like other parts to be mounted on the circuit board. It is. This applies not only to transformers but also to inductance elements such as air-core coils. It is a common thing.

0004 Therefore, conventional surface-mounted inductance elements If you form a pole and mount a transformer or coil on the top surface of this insulator board, In most cases, the ends of the transformer windings or coils are soldered to the end electrodes.

[0005] FIG. 6 is a partial cross-sectional view showing an example of a conventional surface-mounted inductance element. figure In 6, 1 is the core, 2 is the winding wound around core 1, and 3 is from core 1 and winding 2. This is an insulator substrate on which a transformer is mounted. An edge electrode is provided at the end of the insulator substrate 3. By forming a pole 4a and soldering the end 2a of the winding to this end electrode 4a, This constitutes a surface-mounted inductance element.

[0006]

[Problem that the idea aims to solve]

However, in such conventional surface-mounted inductance elements, an insulator substrate is used. Insert the end of the transformer winding or coil into the end electrode formed in the notch at the end. Because it is only soldered, the end of the winding or coil will not jump in the opening direction of the notch. It easily curled up and was difficult to solder. In addition, the notch formed at the end of the insulator substrate The end electrodes are used when mounting a surface mount type inductance element on a circuit board. Since it is also used as a connection electrode, the end surface may be damaged by the heat generated during soldering to the circuit board. The solder on the electrode melts and the end of the transformer winding or coil comes off from the end electrode. There was also the problem that the reliability after soldering deteriorated.

[0007] The purpose of this invention is to connect the transformer windings or coils to the insulator substrate. Surface mounting is easy and does not reduce reliability even after soldering to a circuit board. An object of the present invention is to provide a type inductance element.

[0008]

[Means to solve the problem]

The surface-mounted inductance element of this invention has multiple end faces on the edge of the insulator substrate. Form an electrode, and place each end electrode at a position close to each of these end electrodes. A through hole for conduction is provided, and a transformer or coil is mapped on the insulator substrate. At the same time, the winding or coil of the transformer is connected to the through hole. It is characterized by continuing.

[0009]

[Effect]

In the surface-mounted inductance element of this invention, it is formed on the edge of an insulator substrate. A through hole connected to each end electrode is placed in a position close to each end electrode. - hole is provided, and the transformer or coil is mounted on the insulator board. and the winding or coil of the transformer is connected to the through hole. Ru. Therefore, the winding or coil of the transformer is connected to the end electrode through the through hole. It will be connected. With this configuration, transformer or coil When mounting the transformer on an insulator substrate, the ends of the transformer windings or coils Soldering workability is improved because soldering can be done while securely fixed in the through hole. will improve. In addition, the completed surface mount inductance element is mounted on the circuit board. When soldering, even if the solder in the through hole melts due to the heat during soldering, the winding or The end of the coil will not come off, and there will be no decrease in reliability after soldering.

0010

【Example】

The structure of the surface-mounted inductance element according to the first embodiment of this invention is shown in FIGS. Shown in Figure 3.

[0011] FIG. 1 is a perspective view thereof. In Figure 1, 1 is a toroidal ferrite core. , 2 is a trifilar winding wound around the core 1. 3 is core 1 and winding This is an insulating ceramic substrate on which a transformer composed of 2 and 2 is mounted.

0012 End surface electrodes 4a to 4f are formed at the ends of two opposing sides of this substrate 3, and these ends Through holes 5 each connected to each end surface electrode are located close to each surface electrode. a to 5f are formed. Then, the ends 2a to 2 of the winding 2 are inserted into these through holes. f is connected.

[0013] FIG. 2 is a plan view of the insulator substrate shown in FIG. 1. Here, 5a to 5f are end surface electrodes. This is a through hole provided in a position close to 4a to 4f, and the front (back) ) is electrically connected via an electrode formed on the surface. Such end electrodes, -The holes and the electrodes connecting the two are printed and baked with conductive paste. Although it can be formed by a film method, it can be formed by a thin film method such as plating, vapor deposition, sputtering or CVD. It may also be formed by a film method.

[0014] FIG. 3 is a partial cross-sectional view showing the structure of the connection part of the winding to the through hole 5a. . As shown in the figure, the end portion 2a of the winding is connected to the through hole 5a from the top surface of the insulator substrate. 3 is inserted almost to the back side. After adhesively fixing the transformer to the surface of the board 3, each winding For example, with the ends of the wires inserted into the corresponding through-holes, By doing this, you can solder the winding ends to each through hole all at once. I can.

[0015] Next, examples of other connection forms of the winding ends to the substrate are shown in FIGS. 4 and 5. figure 4 inserts the end 2a of the winding wire into the through hole 5a from above, and then inserts the end 2a into the through hole 5a from the top. It is folded back to the notch where the electrode 4a is formed. Figure 5 shows the end of the winding 2a into the through hole 5a from the back side of the substrate 3 through the notch of the end electrode 4a. This is what I entered. In this way, both the notch and the through hole of the end electrode can be used. If the ends of the windings are fixed with It can be fixed and soldered as is. Also, this surface mount inductor When mounting a sensor element on a circuit board, the heat generated during soldering may damage the half of the through hole. Even if the field melts, the windings will not loosen.

[0016] In addition, in the example shown above, one through hole was provided at the end of each winding. , there may be more than one. In addition to the insulating ceramic board, the substrate 3 is made of paper film. It may also be a resinous substrate made of phenol, glass, epoxy, or the like. Also, on the board The same applies when mounting choke coils or air core coils. can. Additionally, there are resistors, capacitors, diodes, or transistors on the board. May be mounted with any other components.

[0017]

[Effect of the idea]

According to this invention, the transformer is connected to the end electrode formed at the end of the insulator substrate. When electrically connecting windings or coils, connect them through through holes. This makes it easy to install and connect transformers or coils. . Also, the connections of the windings or coils will not come off even if the solder is remelted. This ensures the reliability of the winding or coil connections even after surface mounting on the circuit board. be done.

[Brief explanation of drawings]

FIG. 1 is an external perspective view of a surface-mounted inductance element according to a first embodiment.

FIG. 2 is a plan view of an insulator substrate.

FIG. 3 is a partial cross-sectional view of the surface-mounted inductance element according to the first example.

FIG. 4 is a partial cross-sectional view of a surface-mounted inductance element according to a second example.

FIG. 5 is a partial cross-sectional view of a surface-mounted inductance element according to a third example.

FIG. 6 is a partial cross-sectional view of a conventional surface-mounted inductance element.

[Explanation of symbols]

1-core 2-Winding 3-Insulator substrate 4-End electrode 5-Through hole

Claims (1)

[Scope of utility model registration request] 1. A plurality of end face electrodes are formed at the end of an insulating substrate, through holes are provided in positions close to each of these end face electrodes to be electrically connected to each of the end face electrodes, and a transformer or a transformer is formed on the insulating substrate. A surface-mounted inductance element, characterized in that a coil is mounted thereon, and the winding or coil of the transformer is connected to the through hole.