JPH0638210U - Small coil - Google Patents

Abstract

(57) [Summary] (Modified) [Purpose] By changing the terminal structure in a small coil formed by housing a wire-wound coil in a resin container having a coil housing recess and extending the coil end to the lower surface of the resin container. A small coil that enables highly reliable automatic assembly and automatic mounting. [Structure] Stand-off the U-shaped flat terminal short portion 18 and the U-shaped flat terminal short portion 18 of the U-shaped flat terminal 16 having the U-shaped flat terminal long portion on the lower surface of the resin container 3 for housing the coil. Also, the resin container 3 is integrally molded and attached to the outer surface of the lower surface of the resin container 3 at the symmetrical positions on both sides, and the guide groove 17 is provided on the outer surface of the resin container 3 on the same surface as the outer surface of the U-shaped flat terminal short portion. The coil end 2 of the wire-wound coil 1 housed in the coil housing recess is connected to the surface of the U-shaped flat terminal short portion 18 by electric welding to be formed.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a structure of a small coil used for a data line filter or the like incorporated in an electronic circuit for suppressing electromagnetic noise.

[0002]

[Prior art]

 For example, a small coil with a wound outer diameter of 4.5 mm, an inner diameter of 2.5 mm, and a height of 1.5 mm is wound around a toroidal core, and is used as a data line filter component to prevent electromagnetic interference in signal lines. It is used. In order to mount a small wire-wound coil such as the toroidal normal mode choke coil on the substrate, the wire-wound coil (hereinafter referred to as coil) is a crescent-shaped with a standoff 5 as shown in FIG. The wire-wound coil 11 is housed in a block-shaped resin container 13 having a coil housing recess 20 formed on the upper surface thereof, and the coil terminal 12 is inserted into the through hole 4 provided on the bottom surface of the resin container, and the coil terminal 12 is used as a printed circuit board. It was inserted and soldered.

[0003]

[Problems to be solved by the device]

 Since the copper wire to be wound around the coil is soft copper wire, the wire is too flexible and difficult to insert into the through hole provided at the bottom of the resin container.For example, the coil end has waviness during winding work, and the coil end needs to be solder-plated. However, automatic assembly and automatic mounting on the board were difficult.

[0004]

[Means for Solving the Problems]

 Since it is difficult to automate the insertion of the solder-plated coil end into the through hole on the bottom of the resin container, two U-shaped flat terminals for the normal mode coil and four for the common mode coil are provided on the bottom of the resin container. The individual pieces are planted in symmetrical positions on both sides of the bottom surface of the resin container, and the coil ends of the wire-wound coil are welded to the sides of the short portion of the U-shaped flat terminal of the U-shaped flat terminal to form a small coil. The structure of the small coil of the present invention is such that the coil-shaped flat terminal integrally formed on the bottom surface of the resin container having the coil storage recess formed on the upper surface is formed, and the coil is stored in the coil storage recess of the resin container. Install the terminal along the guide groove formed on the side of the case. Then, the outer end surface of the short portion of the U-shaped flat terminal integrally molded in the resin container is brought into contact with the coil end, and the U-shaped flat terminal and the coil end are welded and connected by resistance welding to form the small coil of the present invention. To do.

That is, according to the present invention, a wire-wound coil is housed in the coil housing recess of a resin container in which a coil housing recess is provided on the upper surface and standoffs and holes or grooves for leading out coil ends are provided on the substrate surface of the bottom surface. In a small coil formed by mounting coil terminals on a board, a U-shaped flat terminal short section and a U-shaped flat terminal long section in which one side is short and the other long The flat terminals are planted with the short flat terminals facing outward, and a guide groove for guiding the coil end upward is provided on the outer surface of the resin container in the same plane as the upper surface of the short U-shaped flat terminals. The small coil is characterized in that the coil end of the wire-wound coil attached to is guided through the guide groove and the coil end and the short portion of the U-shaped flat terminal are welded and connected.

[0006]

[Action]

 A plan to connect the coil end of the wire-wound coil to the U-shaped flat terminal provided on the side of the resin container.It is led out along the inner groove and is formed integrally with the U-shaped flat terminal long part that connects the coil terminal and the board conductor. The short end of the U-shaped flat terminal is contacted, and the coil end of the coil is connected by electric welding to the short end of the U-shaped flat terminal by resistance welding, so automation is possible during manufacturing and assembly, and reliability is improved. Use a small coil with improved performance.

[0007]

【Example】

 An embodiment of the present invention will be described with reference to the drawings. FIG. 1 is an exploded perspective view of a small coil according to the present invention, in which a coil housing recess 20 is formed on the upper surface of a resin container 3, and the coil diameter is a crescent-shaped resin container with both ends projecting upward. The wire-wound coil 1 can be stored in the resin container 3 up to the lower surface of about 2/3. In addition, the resin container 3 is formed with a guide groove 17 on its side surface for guiding the coil end 2 to the U-shaped flat terminal short portion 18. On the other hand, the U-shaped flat terminal 16 integrally formed on the bottom surface of the resin container at the time of resin molding has the standoff 5 and the U-shaped flat terminal short portion 18 as shown in FIG. In the case of a coil having terminals, the terminals of the coil are attached to each other on a diagonal line on the side surface of the resin container in order to attach them to each other. The outer surface of the U-shaped flat terminal short portion 18 and the guide groove 17 are formed so as to be flush with each other, and the U-shaped flat terminal short portion also serves as a standoff when mounted on a board. When the coil end is welded, the U-shaped flat terminal short portion 18 is exposed below the bottom surface of the resin container so as to facilitate the welding work, and both sides are exposed. As shown in FIG. Since the welding is performed from the upper surface of the U-shaped flat terminal and the back surface of the U-shaped flat terminal short portion 18, the coil terminal and the U-shaped flat terminal can be connected electrically and mechanically with high reliability. FIG. 3 is an external perspective view of the U-shaped flat terminal, in which the U-shaped flat terminal short portion 18 is wider than the U-shaped flat terminal long portion 19 and has a width equal to that of the U-shaped flat terminal long portion 19. Since the coil end is welded to the non-overlapping part, the welding work is facilitated when the coil end is welded to the surface of the U-shaped flat terminal. The protrusion 22 is for ensuring the fixing when integrally molded into the resin container. Although the embodiment of the present invention has been described by taking the example of the normal mode coil having two coil terminals, it is obvious that the present invention can also be applied to a common mode coil having two windings on one toroidal core. is there.

[0008]

[Effect of device]

 By making a small coil using the U-shaped flat terminal according to the present invention, the urethane-covered coil terminal is pressed against the short portion of the U-shaped flat terminal and a voltage and current are applied to the urethane-coated flat terminal to destroy and weld the urethane coating. Therefore, it is not necessary to perform solder plating on the surface of the coil terminal, the coil terminal and the U-shaped flat terminal can be easily connected, and the coil assembly work can be easily automated. Also, the time required for assembly can be shortened, the assembly cost can be reduced, and an inexpensive small coil can be obtained. Therefore, the size of the coil should be low, and the electrical and mechanical connection between the terminal and the coil terminal can be surely made, and the length of the terminal mounted on the board can be made constant, so that the coil can be mounted on the board with improved reliability. You can

[Brief description of drawings]

FIG. 1 is an exploded perspective view of a small coil according to the present invention.

FIG. 2 is a perspective view from the bottom showing the details of welding the coil end of the small coil of the present invention to the short portion of the U-shaped flat terminal.

FIG. 3 is an external perspective view of a U-shaped flat terminal.

FIG. 4 is an exploded perspective view of a conventional small coil.

[Explanation of symbols]

 1,11 Winding type coil 2,12 Coil end 3,13 Resin container 4 Through hole 5 Standoff 16 C-shaped flat terminal 17 Guide groove 18 C-shaped flat terminal short section 19 C-shaped flat terminal long section 20 Coil storage Recess 22 Protrusion

Claims (1)

[Scope of utility model registration request] 1. A winding type coil is housed in a coil housing recess of a resin container in which a coil housing recess is provided on an upper surface and a hole or groove for leading out a standoff and a coil end is provided on a substrate surface of a bottom surface, and a coil terminal is provided on a substrate. In a small coil formed so as to be mounted on a flat surface, a flat U-shaped flat terminal having a short U-shaped flat terminal and a long U-shaped flat terminal on one side is symmetrically located on the bottom surface of both sides of the resin container. A wire-wound type in which the terminal short part is planted outward, and a guide groove for guiding the coil end upward is provided on the outer surface of the resin container on the same surface as the upper surface of the U-shaped flat terminal short part, and is installed in the coil storage recess. A small coil characterized in that the coil end of the coil is guided through the guide groove to weld and connect the coil end and the U-shaped flat terminal short portion.