JPH0218588Y2 - - Google Patents

Description

[Detailed description of the invention] (Field of industrial application) The present invention relates to a small noise filter that combines a chip capacitor and ferrite beads.

(Prior art) Conventionally, noise filters that can be mounted on printed wiring boards include a so-called three-terminal capacitor connected to one side of the opposing electrode of a disc-shaped ceramic capacitor in the middle of an external connection conductor, and a ferrite bead. There is a combination of these by inserting ferrite beads into both ends of the intermediate connecting conductor.

(Problems to be solved by the invention) Noise filters using disk-shaped three-terminal capacitors have a problem of large height dimensions, and the number of components mounted on wiring boards is increasing, so there are fewer There is a problem in that lead wire type electronic components require different connection work than chip type electronic components. Therefore, an object of the present invention is to provide a small chip-type noise filter that can be directly attached to a wiring board.

(Means for Solving the Problems) In order to achieve the above-mentioned object, the present invention has a prismatic chip capacitor and two prismatic ferrite beads that are brought into contact with each other on their respective sides and assembled into a composite chip. This is a noise filter which abuts the terminal at the upper end of the chip capacitor, and holds the chip capacitor by penetrating the protruding piece of the conductor through the central hole of the ferrite bead and bending it at the lower end of the chip capacitor.

(Function) Since the ferrite beads surround the connection line between the capacitor and other electronic components, they absorb noise generated in this connection line. Furthermore, since the chip capacitor and ferrite beads are firmly fixed by a conductor, the chip capacitor and ferrite beads collectively constitute a composite noise filter, which is compact in size.

(Example) An example of the present invention will be described with reference to the drawings.
In Fig. 1, 1 is a chip capacitor 2, 2' is a ferrite bead, 3 is a conductor, and its longitudinal ends constitute protruding sides 3', 3'', respectively. 21 is a hole made in the center of the ferrite bead. central hole,
22 in FIG. 1b is a shallow groove. The structure of the noise filter according to the present invention will be explained with reference to FIG.

The ferrite beads 2, 2' have a side surface that is approximately the same size as the shorter side surface of the rectangular chip capacitor 1, and a center hole 21 that penetrates vertically, and the bottom surface reaches from the periphery of the center hole 21 to the bottom edge of the side surface. A shallow groove 22 is formed. The depth of the shallow groove 22 is approximately equal to the thickness of the conductor 3 so that the protruding pieces 3' and 3'' at both ends of the conductor 3 can be fitted in the ferrite bead 2 so that the protrusions 3' and 3'' are flush with the bottom surface of the ferrite bead 2. It is made by abutting ferrite beads 2, 2' on both sides of the short side of the chip capacitor 1 on the side opposite to the opening of the shallow groove 22.If a withstand voltage is required between the ferrite beads 2 and 2', It is sufficient to insert an insulating plate at the contact part, and the protruding pieces 3', 3'' of the conductor 3 are narrow enough to penetrate into the central holes 21 of the ferrite beads 2, 2', and the tips of the protruding pieces that have been penetrated are bent. The chip capacitor is held between ferrites 2 and 2'.

FIG. 3 shows another embodiment of the invention. As shown in an exploded view in FIG. 4, two ferrite beads 2 having the same configuration as that explained in FIG. This is a noise filter in which a conductor 3, which is punched and bent as shown in FIG. 4, is inserted into the center hole of a ferrite bead 2 and connected to the upper terminal of a capacitor 1.

(Effects of the Invention) As explained above, according to the present invention, a small and thin chip-type noise filter can be obtained by forming a composite chip by bringing a chip capacitor and two ferrite beads into contact with each other.

[Brief explanation of the drawing]

FIG. 1a is an external perspective view showing an embodiment of the present invention. FIG. 1b is an external perspective view inverted vertically. Second
3 is an external perspective view showing another embodiment of the present invention, and FIG. 4 is an exploded perspective view thereof. In the figure, 1... chip capacitor, 2... ferrite bead, 21... center hole, 22... shallow groove, 3... conductor, 4... insulator.

Claims (1)

[Scope of utility model registration request] It consists of a square chip capacitor 1, two square ferrite beads 2, 2', and a conductor 3 having two protruding pieces 3', 3''. The conductor 3 is brought into contact with the chip capacitor 1
connected to the terminal of the capacitor while covering the upper surface of the capacitor,
The protruding pieces 3', 3'' of the conductor 3 pass through the central hole of the ferrite bead and are bent at the lower end to hold the chip capacitor in the noise filter.