JPH01183906A - Manufacture of noise filter device - Google Patents

Abstract

PURPOSE:To simplify the work manhour by executing the sealing/molding with resin and executing the integral molding after a lead terminal is inserted by matching to the number of terminals at the central round groove part of a ferrite core. CONSTITUTION:A half round groove 15 in proportion to the number of terminals respectively is provided at the central part of rectangular ferrite cores 13 and 14 divided into two respectively, a lead terminal 12 formed with the metal to execute the copper alloy with a spring property or a copper plating to the stainless plate surface is inserted into the half round groove 15, two-divided soft magnetic ferrite cores 13 and 14 are made integral so that the lead terminal can be housed from a lead terminal both surfaces into the half round groove 15 provided on the ferrite core surface, and thereafter, the integral molding is executed by the sealing/molding method to surround the ferrite core with a thermosetting resin 16 (hereinafter called 'resin') such as epoxy resin and by bending the lead terminal in the substrate surface direction so as to insert it into the substrate surface after molding, a noise filter device is constituted.

Description

[Detailed Description of the Invention] [Overview of the Field] The present invention relates to a method for manufacturing a noise filter device that is attached to a printed wiring board of an electronic device or the like to prevent the electronic device or the like from malfunctioning due to electromagnetic noise. be.

[Contents and problems of conventional technology]

FIG. 3 shows the structure of a conventional integrated circuit package type noise filter, in which an inductor 5 is formed by winding a copper wire 6 multiple times around an insulated ring-shaped magnetic body. The pedestal 3 is a rectangular shape made of an electrically insulating resin molded product, leaving a thick wall around the outer periphery, and forming a recessed portion in the center to accommodate the inductor. Further, on the outer wall of the pedestal 3, a protrusion 10 for fixing the lid body 1 to the pedestal 3 is protruded, and on the thick part of the pedestal 3, there are round pin terminals for external connection in the same arrangement as the integrated circuit package. 4 is provided, the copper wire 6 of the inductor after winding is passed through the groove 7 in the edge of the pedestal 3, and the round pin terminal 4 is wound 2 or 3 times around the part 8, and the excess copper wire is removed. The wire 6 is cut and soldered to connect the copper wire 6 and the round bottle terminal 4.

When the connection with each round bottle terminal 4 is completed, in order to prevent the copper wire 6 of the inductor from vibrating and breaking, fix the inductor in the recessed part that accommodates the inductor with silicone or epoxy resin, etc. after installing the inductor. . The lid 1 is made of an electrically insulating resin molded product like the pedestal 3, and is provided with a space for accommodating the pedestal 3 and a fixing window 2 that fits into the fixing protrusion 10 of the pedestal 3.

In the production of conventional noise filter devices, the pedestal and lid are molded from electrically insulating resin.
Because the round pin terminals are press-fitted after the pedestal is formed, work efficiency is significantly reduced, and there are drawbacks such as the round pin terminals falling out or bending during press-fitting, resulting in a lack of reliability. was there.

Also, when connecting the copper wire of the inductor to the round pin terminal, the soldering work was done after winding the copper wire around the round pin terminal two or three times, so the wire should be wound in proportion to the round pin terminal. Soldering was difficult because it required a lot of man-hours, making it unsuitable for mass production.

On the other hand, since the inductor is made by winding a toroidal coil, as the number of windings increases, the number of copper wires that need to be connected to the round bottle terminal increases proportionally, which is cumbersome and unsuitable for mass production. Ta.

[Purpose of the invention]

In the present invention, half-round grooves into which a plurality of lead terminals are inserted are provided at equal intervals in the center of a rectangular soft magnetic ferrite core (hereinafter referred to as ferrite core) in equal intervals to the number of terminals. After inserting the lead terminals according to the number of terminals into the central round groove of the ferrite core, integral molding is performed by sealing with resin. It is an object of the present invention to provide a method for manufacturing a noise filter device characterized in that wire winding is a work and soldering is a work. .

[Structure of the invention]

The present invention is a soft magnetic ferrite core formed into a rectangle and divided into two parts, provided with grooves for inserting lead terminals in equal numbers to the number of lead terminals, and a lead made by punching out a thin metal plate with good conductivity. Insert frame-shaped lead terminals arranged parallel to each other at the same intervals as the grooves of the ferrite core into the grooves of the ferrite core, fit the grooves of the ferrite core and the lead terminals on both sides of the lead terminal, and combine them together using resin. This method of manufacturing a noise filter device is characterized in that it is sealed and molded, then the frame is cut from the tip of the lead terminal, and finally the lead terminal is bent and molded to a predetermined size.

〔Example〕

FIGS. 1 and 2 are perspective views illustrating an embodiment of the present invention.

In Fig. 1, (a) and (C) are rectangular ferrite cores (A) 13 and (B) 14, each of which is divided into two halves, with semicircular grooves 15 in proportion to the number of terminals provided in the center of each. In the semi-circular groove 15, a lead terminal 12 formed using a copper alloy with spring properties as shown in (b) or a metal such as copper plating on the surface of a stainless steel plate is adopted. The divided soft magnetic ferrite core 13.14,
After integrating the lead terminal from both sides so that it fits into the semicircular groove 15 provided on the surface of the ferrite core, the ferrite core is molded into the shape shown in FIG. This device is integrally molded using a sealing molding method to enclose the core, and after molding, the lead terminals are bent in the direction of the board surface so that they can be inserted into the board surface to form a noise filter device. The purpose is to manufacture a noise filter device with a structure that completely eliminates the work of winding copper wire and soldering the nine windings.

In FIG. 1, the shape of the semicircular groove 15 that accommodates the lead terminal 12 provided on the surface of the rectangular ferrite core 13° 14 does not have to be the shape of the semicircular groove shown in the embodiment.
The ferrite core may be a square groove with enough room for the lead terminal to fit in. Also, the ferrite core is a Mn-Zn ferrite core or a Ni-Zn ferrite core with high magnetic permeability, and the abutting surfaces of the upper and lower ferrite cores have a flatness. Ideally, it should have a mirror finish. Further, the positioning guide hole 11 provided on the frame 111 shown in FIG. 1(b) is used for positioning the ferrite core 13.14 and the frame 111 when performing sealing molding.

In the sealing molding using the resin case shown in FIG. 2, sealing is performed by sealing tightly using an adhesive resin or by pressing the resin case using ultrasonic waves.

The sealed ferrite core with lead terminals is cut off from the frame, and the lead terminals are bent so that they can be attached to the board, forming the shape shown in FIG. 2(b) to complete the noise filter device.

〔Effect of the invention〕

As explained above, in the noise filter device according to the manufacturing method of the present invention, winding of the winding around the magnetic core and winding of the end of the winding around the pin terminal are performed to form the inductor, and no work is required for soldering. Since the noise filter device does not require a structure, the number of man-hours required for manufacturing the noise filter device is simplified compared to the conventional method, and it is also possible to manufacture the noise filter device using an automatic machine, making it possible to provide an inexpensive noise filter device.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of parts constituting the noise filter device of the present invention, in which (a) and (C) show a soft magnetic ferrite core with semicircular grooves, and (b) a frame with lead terminals. FIG. 2 is an assembled perspective view of the noise filter device according to the present invention, (a) is a view in which a ferrite core is housed in a lead terminal and integrally molded with resin, and (b) is a perspective view of the completed noise filter device. FIG. 3 is a perspective view showing a conventional noise filter device, in which (a) shows an inductor housed in a pedestal, and (b) shows a lid. Margin 1 below: Lid body. 2...Fixed window. 3...Pedestal. 4...Round bottle terminal. 5...Inductor. 6...Copper wire. 7...Groove. 8...The wrapping is part. 9...Fixing resin. 10... Protrusion. 11...Positioning guide hole. 111...Frame. 12...Lead terminal. 13... Soft magnetic ferrite core (A). 14... Ferrite core (B). 15... Half-round groove. 16...Thermoplastic resin. Patent applicant Tohoku Metal Industry Co., Ltd. Figure 7 21 72 (b) /2

Claims (1)

[Claims] A soft magnetic ferrite core formed into a rectangle and divided into two parts,
The number of lead terminal insertion grooves for inserting lead terminals is the same as the number of lead terminals, and the lead frame shape is made by punching out a thin metal plate with good conductivity, and the slots are spaced parallel to each other at the same intervals as the grooves in the soft magnetic ferrite core. Insert the arranged lead terminal into the groove of the soft magnetic ferrite core, fit the lead terminal into the groove of the soft magnetic ferrite core on both sides of the lead terminal, and combine.
A method for manufacturing a noise filter device, which comprises integrally sealing molding using resin, then cutting a frame from the tip of a lead terminal, and finally bending the lead terminal to a predetermined size.