JPH0553232U - Substrate type noise filter - Google Patents

Abstract

(57) [Abstract] [Purpose] In a board type noise filter in which a common mode choke coil and a filter element are assembled and formed on a board, by combining with a wiring conductor on a wiring board without winding a winding wire. A substrate type noise filter is formed by forming a coil and mounting a filter element. [Structure] A bottom surface having an annular space is opened by using a normal resin and a special resin having a plating adhesion property, and a large number of pin terminal portions 2 are integrally formed on the outer peripheral edge and the inner peripheral edge of the opening end at substantially equal intervals. Insulation consisting of a double cylinder in which the special resin is projected and exposed on the outer peripheral surface of the double cylinder at intervals in the circumferential direction in a strip shape and up to the pin terminal portion, and the exposed surface is electroless plated. The toroidal core 13 is covered with the cover 1, and the conductors forming the coil on the wiring substrate 6 and the capacitors 8 and 9 are mounted on the substrate to form a substrate type noise filter.

Description

[Detailed description of the device]

[0001]

[Industrial application]

 The present invention relates to a noise filter in which a toroidal choke coil made of a soft magnetic material and a capacitor are mounted on a wiring board.

[0002]

[Prior Art]

 The conventional board-type noise filter uses a rectangular wiring board with wiring conductors for forming a noise filter circuit on the bottom surface, and faston tabs are inserted along both short edges to form a toroidal shape in the center of the board. The structure was such that a common mode choke coil (hereinafter referred to as coil) was mounted, and a filter element such as a capacitor was mounted around the coil. The toroidal common-mode choke coil has a toroidal core housed in a core insulation case that has a central partition plate to insulate the windings from each other. Two windings were wound through the hole and the ends of the winding were pulled out in the axial direction of the core.

[0003]

[Problems to be solved by the device]

 The above-mentioned toroidal choke coil requires a lot of man-hours for winding the winding work, it is difficult to draw the ends of the winding into a certain arrangement, and the arrangement is easily disturbed. There was a drawback that it could not be mounted on the board efficiently.

[0004]

[Means for Solving the Problems]

 The wiring board with the conductors that form the windings and the insulating cover with the conductors on the outer surface that accommodates the toroidal core cover the toroidal core with the insulating cover to separate the wiring board conductors from the insulating cover conductors. Connect and attach to form a choke coil, attach the filter element to the wiring board, and create the filter circuit by soldering. The conductor of the insulating cover is made of ordinary resin and special resin with plating adhesion, and the conductor is formed by electroless plating on the part where the special resin is exposed in the required shape to form a coil.

That is, the present invention is a board-type noise filter in which a filter element is mounted on a wiring board provided with input / output terminals, and an annular space is formed by using a normal resin and a special resin having a plating adhesion property. The bottom surface has an opening, and a large number of pin terminals are integrally projected at substantially equal intervals on the outer peripheral edge surface and the inner peripheral edge surface of the opening end, and the special resin is circumferentially spaced on the outer surface of the double cylindrical body. Wiring that forms a coil by covering the toroidal core with an insulating cover consisting of a double cylinder that is exposed in a strip shape and extends to the pin terminals, and the exposed surface is electroless plated to form a strip conductor. A board-type noise filter characterized by being built into a wiring board provided with a wiring conductor that connects the conductor and the filter element.

[0006]

[Action]

 The insulating cover holds a toroidal core (hereinafter referred to as the core) on the substrate and insulates the core from the conductor to form a winding forming a coil.

[0007]

【Example】

 An embodiment of the substrate type noise filter according to the present invention will be described with reference to the drawings. FIG. 1 shows an exploded perspective view of a substrate type noise filter according to the present invention, wherein an insulating cover 1 is made of heat resistant resin and is a double cylinder having an open bottom having an annular space. A large number of pin terminal portions 2 are integrally projected at substantially equal intervals on the inner peripheral edge and outer peripheral edge of the insulating cover 1. The inner peripheral edge pin terminal portions 2 and the outer peripheral edge pin terminal portions 2 correspond to each other in the radial direction, and a large number of strip conductors 3 are formed on the outer surface of the insulating cover 1 so as to connect the corresponding pin terminal portions 2. In addition, they are provided at intervals in the circumferential direction. The strip conductor 3 continues to the conductor on the surface of the pin terminal portion 2. FIG. 2 is a vertical sectional view of the insulating cover 1 taken along the line AA. The insulating cover 1 is made of ordinary resin 4 and special resin 5 which has plating adhesion. The exposed surface of the special resin 5 is electroless plated and the strip conductor 3 (not shown in the cross section) and the pin terminal portion 2 are formed. And a conductor of. The special resin 5 is a primary molding in which a groove for connecting the pin terminal portion 2 is provided on the outer surface in the primary molding of the ordinary resin 4 and the groove is extended to the pin terminal portion 2 and the pin terminal portion 2 is cut out. The body is exposed in the required shape by filling the grooves and notches and performing secondary molding. In the wiring board 6, the faston tab 7 is inserted along the short side edge of the rectangle, the capacitors 8 and 9 are mounted in the vicinity of the faston tab 7, and the choke coil is arranged in the central portion to form a noise filter. A through hole 10 through which the pin terminal portion 2 of the insulating cover 1 can be inserted is formed in the central portion of the wiring board 6. FIG. 3 shows the wiring conductor on the bottom surface of the wiring board 6. In FIG. 3, a wiring conductor 11 (a V shape in the figure) that connects the through hole 10 on the center side and the through hole 10 on the outer side is a conductor that is connected to the strip-shaped conductor 3 of the insulating cover 1 to form a coil, The wiring conductors 12 (three kinds, five in the figure) are conductors for connecting to the filter circuit. As shown in FIG. 1, the L-shaped faston tab 7 is attached to the wiring board 6 from below to connect to the wiring conductor 12, the capacitors 8 and 9 are mounted, and the toroidal core 13 is attached to the wiring board 6. Then, the toroidal core 13 is covered with the insulating cover 1, the pin terminal portion 2 is inserted into the through hole 10, the insulating cover 1 is mounted on the wiring board 6, and then the wiring board 6 is dipped in a solder bath to simultaneously form the wiring conductor. 11. Solder the wiring conductor 12. In FIG. 1, two windings having six turns are formed by the wiring conductor 11 and the band-shaped conductor 3, and a substrate type noise filter having a toroidal choke coil without winding work is completed. The insulating cover 1 may be mounted after the toroidal core 13 is housed in the insulating cover 1 using, for example, a snap fit type annular bottom plate or a double-sided adhesive tape.

[0008]

[Effect of the device]

 As described above, the board-type noise filter according to the present invention can be made by simply mounting the insulating cover on the board as the choke coil, and connecting the winding conductor and the filter circuit to each other with a single solder bath immersion. Since the configuration is performed in step 1, the assembly man-hours can be reduced, the automation rate can be improved, and the production cost can be reduced.

[Brief description of drawings]

FIG. 1 is an exploded perspective view showing an embodiment of a substrate type noise filter according to the present invention.

FIG. 2 is a vertical sectional view taken along line AA of the insulating cover in FIG.

FIG. 3 is a bottom view of the wiring board in FIG.

[Explanation of symbols]

 1 Insulation Cover 2 Pin Terminal 3 Band Conductor 4 Resin 5 Special Resin 6 Wiring Board 7 Faston Tab 8,9 Capacitor 10 Through Hole 11,12 Wiring Conductor 13 Toroidal Core

Claims (1)

[Scope of utility model registration request] 1. A substrate type noise filter comprising a filter element mounted on a wiring board provided with input / output terminals, wherein a bottom surface having an annular space is opened and opened by an ordinary resin and a special resin having a plating adhesion property. A large number of pin terminal portions are integrally projected at substantially equal intervals on the outer peripheral edge surface and the inner peripheral edge surface of the end, and the special resin is formed on the outer surface of the double cylindrical body in a strip shape at circumferential intervals and in a pin terminal portion. Connect the wiring conductor and the filter element that covers the toroidal core with an insulating cover consisting of a double cylinder with a band-shaped conductor formed by electroless plating on the exposed surface. A board-type noise filter, characterized in that the board-type noise filter is built in a wiring board provided with a wiring conductor.