JPH0553233U - Resin box type noise filter - Google Patents

Abstract

(57) [Abstract] [Purpose] A common mode choke coil was mounted in the center of a rectangular wiring board, and the noise filter circuit board on which parts such as capacitors were assembled was housed in a box-shaped container made of insulating resin. In a resin box type noise filter, the resin box type noise filter can be constructed without manually connecting the choke coil winding and the winding end portion. [Structure] A wiring board 5 having wiring conductors 10 and 11 for circuits and wiring, a double cylindrical body having an open bottom surface, a winding band-shaped conductor 14 provided on an outer surface, and a band-shaped conductor 14 at an opening end surface.
The toroidal core 17 is housed in the insulating cover 12 and the pin terminal portion 13 is inserted into the wiring board 5 to form the toroidal coil, thereby forming a resin box type noise filter. ..

Description

[Detailed description of the device]

[0001]

[Industrial application]

 The present invention relates to a structure of a resin box type noise filter in which a filter circuit is assembled using a wiring board, and a board having external connection plate terminals attached to the board is housed in an insulating resin box container.

[0002]

[Prior Art]

 The conventional resin box type noise filter has a rectangular wiring board provided with circuit conductors for connecting filter elements, and the external connection board terminals bent in an inverted L shape are parallel to the board at the required height. A toroidal common-mode choke coil (hereinafter coil ) Is mounted, a capacitor is mounted between the coil and the plate terminal and soldered, and the one assembled into the noise filter circuit is made of two-piece insulation resin with a groove for arranging the plate terminal at the opening edge. It had a structure in which it was housed in a box-shaped container and the opening edge was joined with an adhesive.

[0003]

[Problems to be solved by the device]

 The choke coil described above requires a lot of man-hours because it is made by hand, and it is troublesome to pull out the ends of the winding into a predetermined arrangement. It had the drawback of having to be worn.

[0004]

[Means for Solving the Problems]

 A conductor that is a part of the winding is provided on the wiring board together with a circuit conductor, and a band-shaped conductor that is the other part of the winding is provided on the outer surface of the insulating cover that can accommodate the toroidal core, and the insulating cover is mounted on the board by covering the core. Then, solder the board to make a choke coil and a filter circuit at the same time. For the strip-shaped conductor of the insulating cover and the pin terminal part conductor connected to the strip-shaped conductor, a heat-resistant insulating cover with a pin terminal part was made with ordinary resin and special resin with plating adhesion, and the special resin was exposed to the required shape. It is provided by electroless plating on the part.

That is, according to the present invention, a filter element is mounted on a wiring board having a plate terminal for external connection to form a required circuit, and the circuit board is housed in a two-part resin container having a groove for leading out the plate terminal at an opening edge. In the resin box type noise filter installed, a wiring board provided with circuit conductors and winding conductors, and a double cylindrical body with an open bottom surface, with a winding strip conductor provided on the outer surface and a strip shape at the opening end surface. A resin box noise filter characterized by having a toroidal choke coil in which a toroidal core is housed in an insulating cover and pin terminals are inserted into a substrate by an insulating cover provided with pin terminals connected to conductors. .

[0006]

[Action]

 The insulating cover forms a winding by holding the toroidal core on the substrate while insulating it from the outside.

[0007]

【Example】

 FIG. 1 shows an exploded perspective view of an embodiment of a resin box type noise filter according to the present invention. In FIG. 1, a box-shaped lower container (hereinafter, referred to as a lower container) 1 and a box-shaped upper container (hereinafter, referred to as an upper container) 2 are two-divided containers made of an insulating resin, and are provided at the opening edge of the lower container 1. A groove 3 for arranging the aston tab 6 is formed, and the upper container 2 is provided with a projecting piece 4 (only two are shown) corresponding to the groove 3 at the opening edge. A wiring board (hereinafter referred to as a board) 5 is a rectangle having an outer dimension slightly smaller than the inner dimension of the lower container 1, and a faston tab (hereinafter referred to as a tab) 6 is attached along a short side edge thereof. The tab 6 is a plate terminal for external connection of the noise filter, which has a shape in which the free end is bent outward in a reverse L shape at right angles to the substrate at an intermediate height and extends to the outside of the substrate 5. Through holes are formed in the board 5 in the vicinity of the tabs 6 so that the line-to-line capacitors 7 and the line-to-ground capacitors 8 can be mounted, and a large number of small holes 9 are formed in the central portion in a double circle arrangement. The outer small hole 9 and the inner small hole 9 are on the same radius. Wiring conductors 10 and 11 are provided on the bottom surface of the substrate 5 as shown in FIG. The V-shaped wiring conductor 10 connecting the inner small hole 9 and the adjacent outer small hole 9 is a coil winding conductor. The other wiring conductor 11 is a circuit conductor, and continues to the insertion / connection conductor of the tab 6 which is a rectangular through hole at the edge.

The insulating cover 12 is a resin molded body that can be dipped in a solder bath. As shown in FIG. 3 which is an upside down view of FIG. 1, the insulating cover 12 is a double cylinder whose bottom surface is open. A large number of pin terminal portions 13 are integrally projected on the outer peripheral edge surface of the opening and the inner peripheral edge surface of the opening of the inner cylinder. The arrangement of the pin terminal portions 13 is the same as the arrangement of the small holes 9 of the substrate 5. A large number of band-shaped conductors 14 are provided on the outer surface of the insulating cover 12 at intervals in the same direction. The strip-shaped conductor 14 has a shape that connects the pin terminal portions 13 on the same radius and extends to the tip end surface of the pin terminal portion 13. FIG. 4 is a cross-sectional view of the insulating cover 12 shown in FIG. 3 cut along the line EE. The insulating cover 12 is made of a resin 15 that cannot be plated normally and a special resin 16 having a plating adhesion property. The insulating cover 12 is dipped in an electroless plating solution and the strip-shaped conductor 14 (shown in FIG. No)) is formed.

Because of the structure of the wiring conductor 10 and the wiring conductor 11 of the wiring substrate 5 and the insulating cover 12 described above, the toroidal core 17 is placed on the substrate 5, the insulating cover 12 is covered, and the pin terminal portion 13 is formed into a small hole. 9 is inserted into the board 5, and then the board 5 is immersed in a solder bath to be soldered to the wiring conductor 10 and the wiring conductor 11, the wiring conductor 10 and the strip conductor 14 are connected, and the number of windings is 6 times. These two windings form a toroidal common mode choke coil and at the same time a noise filter circuit is completed. The finished substrate 5 is housed in the lower container 1 with the tab 6 fitted in the groove 3, and the upper container 2 is covered and fixed to the lower container 1 to complete the assembly of the resin box type noise filter.

[0010]

[Effect of the device]

 The resin box type noise filter according to the present invention can be made by mounting the insulating cover, which is made by electroless plating on the resin molded body, on the core of the toroidal choke coil, and mounting it on the wiring board. Labor costs can be reduced by switching from workers to automation equipment, and production efficiency can be improved.

[Brief description of drawings]

FIG. 1 is an exploded perspective view showing an embodiment of a resin box type noise filter of the present invention.

FIG. 2 is a bottom view of a wiring board used in the resin box type noise filter of the present invention.

FIG. 3 is an external view of an insulating cover of the resin box type noise filter of the present invention.

FIG. 4 is a vertical sectional view taken along the line EE of FIG.

[Explanation of symbols]

 1 Lower Container 2 Upper Container 3 Groove 4 Projection Piece 5 Wiring Board 6 Faston Tab 7,8 Capacitor 9 Small Hole 10,11 Wiring Conductor 12 Insulation Cover 13 Pin Terminal 14 Band-shaped Conductor 15 Resin 16 Special Resin 17 Toroidal Core

Claims (1)

[Scope of utility model registration request] 1. A circuit board provided with a plate terminal for external connection is mounted with a filter element to form a required circuit, and the circuit is housed in a two-part resin container having a groove for leading out the plate terminal at an opening edge. In a resin box type noise filter, a wiring board provided with a circuit conductor and a winding conductor, and a double-cylinder body with an opened bottom surface, a winding strip-shaped conductor provided on the outer surface, and a strip-shaped conductor formed on the opening end surface. A resin box type noise filter having a toroidal choke coil in which a toroidal core is housed in an insulating cover and a pin terminal is inserted into a substrate by an insulating cover provided with connecting pin terminals.