JPH0441621Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to a noise filter that is attached to a printed wiring board of electronic equipment, etc., and uses an integrated circuit package type terminal arrangement to prevent electronic equipment, etc. from malfunctioning due to electromagnetic noise. The present invention relates to a method of manufacturing a board-mounted noise filter.

FIG. 3 shows the structure of a conventional integrated circuit package type noise filter, in which a conductive wire 6 is wound several times around an annular magnetic body 5 which has been subjected to insulation treatment to form a coil.

The pedestal 3 is made of an insulating resin molded product, leaving a thick wall on the outer periphery of the rectangle, and molding a recess with a seat in the center to accommodate the coil. Furthermore, a protrusion 10 for fixing the lid 1 to the pedestal 3 is provided on the outer wall of the pedestal 3, and a round pin terminal 4 for external connection is provided in the thick part of the pedestal 3 in the same arrangement as the integrated circuit package. After winding, the conductor 6 of the coil is passed through the groove 7 in the edge of the pedestal 3 and wound around the winding part 8 of the round pin terminal 4 two or three times, and the excess conductor 6 is cut off and soldered. Connect the conductive wire 6 and the round pin terminal 4 using the screw.

After completing the connection of each terminal 4, the coil conductor 6
In order to prevent the coil from vibrating and breaking, the coil is fixed in the recessed part of the pedestal after the coil is installed using silicone, epoxy resin, or the like.

The lid 1 is made of an 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 conventional integrated circuit package type noise filter, the conductor wire 6 of the coil is connected to the winding part 8 of the round pin terminal 4.
Since each terminal is wound two or three times, the number of assembly steps increases in proportion to the number of terminals, resulting in poor work efficiency.
Furthermore, because of its small size, it is troublesome to solder the oil conductor to the pin terminal.

In this invention, a lead frame is formed by punching a metal plate with parallel positioning from both ends toward the center at the same interval as the terminal arrangement pitch of the circuit pattern of the signal line, and the conductor wire wound around the core. This signal line filter is constructed by fixing the terminal to the notch of the lead frame and soldering it, storing it in a pedestal molded using resin, positioning it, and then cutting the lead frame.

FIG. 1 is an assembled perspective view according to an embodiment of the present invention;
FIG. 2a is an external perspective view of a part of the lead frame used in the present invention attached to a wound coil;
FIG. 2b is a diagram showing the lead frame of the present invention with the ends of the lead wires entwined in the cutout portions of the lead terminal pieces.

The lead frame 11 shown in FIG. 2 is made of a highly elastic material such as stainless steel, iron, beryllium copper, or copper alloy such as phosphor bronze, and its surface is coated with tin or solder plating to ensure soldering. . The lead frame 11 is manufactured by punching or photo-etching in the length direction of a metal strip, and is shaped like a band.The lead frame 11 follows the shape of the grooves 17a and 17b in which the leads of the pedestal 23 are accommodated, and has an L-shaped tip. It is shaped like a letter.

The positioning frame is a jig (not shown)
The positioning frame 12 has a lead terminal piece 14 facing the external connection terminal 13 shown in FIG. Figure 2 b
It is constituted by a notch 15 shown in FIG.

The pedestal 23 shown in FIG. 1 is made of electrically insulating resin, has a rectangular shape, has a wall thickness on its outer periphery, and has a recess 16 in the center of the pedestal 23 to accommodate a coil. Further, in the thick part of the pedestal 23, there are grooves 17a, 1 for accommodating the lead terminal piece 14 shown in FIG. 2a.
7b is provided. Further, the lid body 18 is composed of a convex portion 19 for pressing the terminal piece 14 and a fixing window 22.

To assemble the noise filter device according to the present invention, the terminal 20 of a coil formed by winding a conductive wire 6 multiple times around an insulated annular magnetic body 5 shown in FIG.
It is inserted into the hole 15 of the lead terminal piece 14 and soldered.

Next, the lead frame 11 integrated with the coil
is fixed to the jig (not shown) and
After the coils, which are stored in the grooves 17a and 17b of the pedestal 23 shown in the figure and placed in the pedestal recess, are fixed using resin or silicone rubber, the lid 18 is placed over the pedestal 23 and the convex provided on the inside of the lid 18 is fixed. Part 1
9 to hold down each lead terminal piece 14. or,
The lid body 18 also has the fixing protrusion 21 of the pedestal 23 and the lid body 18.
It is fixed with a fixing window 22 provided in the. Next, the lead frame 11 is made into an external terminal 13 by cutting the positioning frame 12 of the lead terminal piece 14 from the broken line 25 shown in FIG.

In the method of using a lead frame according to the present invention as a winding terminal of a coil, the work of soldering the lead wire of the coil to the notch 15 formed in the lead frame is performed by spreading the space between the lead frames. This makes the soldering work easier, and there is no need to form the pin terminal integrally with the pedestal in advance.

As explained above, in the noise filter device of the present invention, the conductor wire of the coil is soldered to a continuously punched lead frame and housed in a base made of resin, and the coil is made of resin, silicone rubber, etc. Fix it, cover with the rear cover and cut the positioning frame part to complete.

Therefore, it is easy to work, and since the pedestal lid is also easy to mold, an inexpensive board-mounted noise filter can be obtained.

[Brief explanation of the drawing]

FIG. 1 is an assembled perspective view of an embodiment of the present invention. Second
Figure a is a partial external perspective view of the lead frame used in the present invention. FIG. 2b is a perspective view when the ends of the conductive wires are entangled in the notches of the lead frame. FIG. 3 is a structural diagram of a conventional integrated circuit package type noise filter. 1, 18... Lid body, 3, 23... Pedestal, 2, 2
2... Fixing window, 4... Round pin terminal, 5... Annular magnetic body, 6... Multiple windings, 7, 17a, 17b...
... Groove, 8 ... Winding part, 9 ... Fixing resin, 1
0, 21... Fixing protrusion, 11... Lead frame, 12... Positioning frame portion, 13... External terminal, 14... Lead terminal piece, 15... Notch, 16... Coil storage recess, 19... ... Convex portion inside the lid, 20 ... Conductor terminal, 25 ... Lead terminal piece cutting site.

Claims (1)

[Scope of utility model registration request] The board-mounted noise filter has a pedestal with a concave part in the center to accommodate the coil, pin terminals on both sides of the pedestal to connect the coil windings, and a cover that covers the pedestal. The lead frame has a pin terminal that connects the ends of the coil wire wound around the magnetic material, and the tips of the two lead frames facing each other with the coil in between are formed into an L-shape. The coil end is connected to the terminal, a groove is provided on the outer periphery of the pedestal made of resin molded product into which the pin terminal is inserted, the pin terminal is inserted into the groove, the coil is placed in the central recessed part and fixed with resin, and the inside Cover the lid with a convex part that presses the pin terminal,
A board-mounted noise filter device characterized in that it is constructed by cutting a positioning frame portion.