JPH0352033Y2 - - Google Patents

Description

[Detailed description of the invention] Industrial application field This invention is a noise filter in which ferrite beads made of small ring-shaped ferrite are inserted through the signal line, and the ferrite beads are collectively housed in a container so as to be attached to a circuit board. Relating to a mounting device.

Conventional technology Digitization of signals handled by electronic equipment, etc.
As speeds increase, electromagnetic noise is likely to be generated or received between signal lines and power lines, and as a countermeasure to this noise, a noise filter circuit is used in which signal lines are penetrated with ferrite beads made of small ring-shaped ferrite. It will be done. Conventionally, in order to directly mount this type of noise filter circuit on a circuit board, ferrite beads are passed through the signal lines on the circuit board, but this work is not easy because there are many signal lines and the ferrite beads are small. Therefore, a portion of this noise filter circuit has been housed together with ferrite beads in a container with the same terminal arrangement as a commonly used integrated circuit package.

Problems to be Solved by the Invention Conventionally, a terminal from the outside of a container housing a part of the noise filter circuit is soldered to the protruding end of the container, which is passed through the center hole of a ferrite bead. The work of attaching the ferrite beads and fixing the ferrite beads penetrated by the electric wire with an adhesive or the like is complicated and takes a long time, and it is difficult to automate the work.

Means for Solving the Problems The present invention eliminates such drawbacks of the conventional method and provides penetrating terminals along both long side walls of a rectangular pedestal made of insulating material in the same arrangement as the terminal arrangement of commonly used integrated circuits. Insert the ferrite beads into the through holes,
This ferrite bead attachment device is used for a noise filter circuit in which both legs of a terminal made of a bent metal material are passed through the center hole of the ferrite bead and protruded from the bottom surface.

Function By passing the leg of the terminal 9 through the center hole of the ferrite bead that is fitted and attached to the pedestal 1 and attaching it to the pedestal 1, the tip of the terminal 9 will protrude from the bottom surface.
Can be easily fixed onto a circuit board.

Embodiment An embodiment of the ferrite bead mounting device used in the noise filter circuit of the present invention will be described with reference to the drawings.

As shown in FIGS. 1 and 2, the mounting device of the present invention has eight small through holes 2 on each side vertically from the top surface to the bottom surface along both long side walls of a rectangular pedestal 1 made of an insulating material. The terminals are installed in the same arrangement as the terminal arrangement of the integrated circuit package. Further, a slightly thick step 3 is left at the bottom of the inner circumferential wall of the small hole 2, and the upper part is concentrically carved with the outer diameter of the ferrite bead as the inner diameter. A rectangular recess is provided in the upper center of the pedestal 1, leaving both side walls intact, and a tsuba 4 is slightly protruded from the outer edge of the bottom, and a plurality of engagements with the same height as the protruding dimension of the tsuba 4 are provided on the outer surface of the long side. A protrusion 5 is provided protrudingly.

It has a box shape that fits into the pedestal 1 on the inner wall and whose upper surface forms the ceiling wall surface, and a shallow groove 8 is carved parallel to the short side in the inner wall of the ceiling at a position corresponding to the small through hole 2 penetrated through the pedestal 1. Further, a locking window portion 7 corresponding to the engaging protrusion 5 of the base 1 is provided through the long side wall to form a lid body 6.

Further, the terminal 9 is formed by making the rod-shaped conductor into an inverted shape so that both legs pass through the small through-holes 2 that face each other. Further, the ferrite bead 10 has a height slightly larger than the depth from the upper surface of the pedestal 1 to the step part 3, and the center hole corresponds to the inner diameter of the small through hole 2.

Step portions 3 of the through holes 2 facing each other on the pedestal 1
Insert the ferrite bead 10 until the terminal 9 is inserted through the center hole of the ferrite bead 10 and the small through hole 2.
are press-fitted into the ferrite beads 10 until their bases contact the end surfaces of the ferrite beads 10. Therefore, eight terminals 9 are attached to sixteen ferrite beads 10 on the left and right sides. After that, when the lid body 6 is placed on the pedestal 1 and press-fitted, the shallow groove 8 and the bottom surface press the base of the terminal 9, the ceiling wall surface presses the end surface of the ferrite bead 10, and the locking window 7 is fitted into the locking protrusion 5. Fixed.
Therefore, the ends of both legs of the terminal 9 protrude from the lower surface of the base 1, so that these ends can be inserted into the mounting holes of the circuit board.

When the ferrite bead attachment device thus formed is connected to a signal line incorporated on a circuit board, the terminal 9 becomes a part of the signal line, forming a noise filter in which the signal line penetrates the ferrite bead 10.

In this embodiment, the number of terminals 9 is 8, and 16 ferrite beads 10 are used on both legs of the terminal 9. However, the number is determined by the signal line on the circuit board, and Ferrite beads may be passed through only one leg when electromagnetic interference is low.

Effects of the invention As described above, according to the invention, the tip of the terminal 9 is placed on the pedestal 1 in the same terminal arrangement as that of the integrated circuit.
The attachment device for the ferrite beads protruding from the bottom surface of the circuit board can be handled in the same way as an integrated circuit, so assembly can be automated and assembly time can be shortened.

[Brief explanation of the drawing]

FIG. 1 is an exploded external perspective view of an embodiment of a ferrite bead mounting device used in the noise filter circuit of the present invention, and FIG. 2 is a vertical sectional side view taken along line E--I in FIG. 1 after assembly. In addition, 1: pedestal, 2: small through hole, 3: step,
6: Lid body, 8: Shallow groove, 9: Terminal, 10: Ferrite bead.

Claims (1)

[Scope of utility model registration request] A metal material bent into an opposite shape is inserted into the center hole of a ferrite bead 10 inserted into the upper surface of the through-hole that runs along both side walls of the pedestal 1 made of an insulating material in the same arrangement as the terminals of the integrated circuit. The terminal 9 can be attached to and removed from the pedestal 1 by passing the legs of the terminal 9 through and protruding from the bottom surface, and the pedestal 1 is covered with a lid body 6 which can be attached and removed. Ferrite bead mounting device used in filter circuits.