JP2001298341A - Noise filter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a noise filter which can be easily assembled and can prevent a terminal pin from floating or eliminate connection defects caused by the heat when soldering using a solder bath. SOLUTION: This device is provided with an insulation board 12 equipped with post-like projections 14, etc., of the required number for holding terminal pins 13, etc., while exposing respective axial ends from the top ends of post-like projections 14 and the surface of the insulation board 12, lead wires 10b-10e, 11b and 11c of an inductor 10 and capacitors 11, etc., are pulled out corresponding to a prescribed circuit configuration, the inductor 10 and the capacitors 11, etc., are mounted on the surface of the insulation board 12 by connecting the lead wires to the axial ends of the respective terminal pins 13 exposed from the top ends of the post-like projections 14, etc., and while using that insulation board 12 as a base plate, a box-like lid 15 is assembled for internally housing the inductor 10 and the capacitors 11, etc., including the post-like projections 14, etc.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention provides an insulating substrate having a required number of terminal pins planted on a plate surface, and connecting inductor and capacitor leads to predetermined terminal pins to connect the inductor and capacitor to the insulating substrate. Mounted on the surface,
The present invention relates to a small box-shaped noise filter in which an insulating substrate is used as a bottom plate and a box-shaped lid for accommodating an inductor and a capacitor therein is assembled.

[0002]

2. Description of the Related Art Generally, noise filters are shown in FIGS.
As shown by "b", the inductor 1 and the capacitors 2 are assembled parts, and the circuit is configured with 5 to 6 input / output terminals.

As shown in FIG. 6A, the noise filter is composed of an inductor 1 having a terminal of a coil 1a connected to lead terminals 1c...
a, a plurality of capacitors 2 derived from the lead wires 2b, 2c..., an insulating substrate 4 provided with a required number of terminal pins 3. 1 and a box-shaped lid 5 for housing the inductor 2 therein.

Conventionally, as the insulating substrate 4, circuit patterns 4a, 4 for electrically connecting lead terminals 1c of the inductor 1 to predetermined terminal pins 3, as shown in FIG.
The printed circuit board provided with b ... on the back side is used.

The inductor 1 is mounted on the insulating substrate 4 by inserting the lead terminals 1c into the holes formed in the plate surface and fixing them by soldering, and the lead wires 2b, 2c. The capacitor 2 is mounted by entangled with the shaft end of the terminal pins 3 to be soldered and fixed, and further, the box-shaped lid 5 is assembled by filling the inside with an insulating resin.

In the noise filter, assembling requires time and effort including press-fitting the terminal pins 3 into the insulating substrate 4. In addition, since the diameter of the hole through which the terminal pins 3 are press-fitted varies in molding, it is necessary to prepare a plurality of types of terminal pins having different shaft diameters, resulting in poor workability including assembly time.

The noise filter is mounted by soldering and fixing the terminal pins 3 to the device board by automatic soldering using a solder bath on the manufacturer of the electric or electronic device. At the time of this soldering, the terminal pins may be lifted by heat, resulting in poor contact. In addition, it is necessary to strictly control the liquid level of the solder tank.

[0008]

SUMMARY OF THE INVENTION An object of the present invention is to provide a noise filter which can be easily assembled and can prevent the occurrence of floating or poor connection due to heat of terminal pins during automatic soldering by a solder bath. And

[0009]

In the noise filter according to the first aspect of the present invention, the required number of columnar projections for holding the terminal pins by exposing the respective shaft ends from the projections of the columnar projections and the plate surface of the insulating substrate. A lead wire of the inductor and the capacitor is drawn out according to a predetermined circuit configuration, and the inductor and the capacitor are connected to the shaft end of each terminal pin exposed from the protruding end of the columnar projection to connect the inductor and the capacitor to the board of the insulating substrate. It is mounted on a surface, and is configured by assembling a box-shaped lid that houses an inductor and a capacitor including columnar projections with the insulating substrate as a bottom plate.

According to a second aspect of the present invention, there is provided a noise filter including a terminal pin having a flange opposed to a protruding end of a columnar projection.

According to a third aspect of the present invention, there is provided a noise filter including a terminal pin integrally formed with a columnar projection by insert molding.

In the noise filter according to a fourth aspect of the present invention, the noise filter is configured by providing a spacer projection which is positioned around an axis of a terminal pin protruding from the plate surface of the insulating substrate.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Referring to FIGS. 1 to 4, a noise filter according to the illustrated embodiment will be described with reference to FIG.
As shown in FIG. 2, one inductor 10 and three capacitors 11 are assembled as components, and each of them is mounted on the surface of the insulating substrate 12 to derive five input / output terminals. It is configured.

As the inductor 10, a coil 10
a is wound in a toroidal shape, and its terminal is pulled out as four lead wires 10b to 10e. Further, as the capacitors 11, two lead wires 11 b and 11 c are drawn out of the capacitor body 11 a and assembled.

As the insulating substrate 12, a substrate provided with five columnar projections 14 for holding the terminal pins 13 on the plate surface is assembled. This insulating substrate 12 has terminal pins 1
3 are formed by insert-molding the columnar projections 14 integrally with an insulating resin.

The columnar projections 14 may be formed to have a height capable of accommodating the inductor 10 and the capacitor 11. The terminal pins 13 are inserted and held by the columnar projections 14 by exposing the respective shaft ends from the projections of the columnar projections 14 and the plate surface of the insulating substrate 12.

On the insulating substrate 12, the inductor 1
0 and the capacitors 11...
e, 11b, and 11c are pulled out in accordance with a predetermined circuit configuration, and are mounted on the plate surface by being connected to the shaft ends of the terminal pins 13 exposed from the protruding ends of the columnar projections. Further, the insulating substrate 12 is used as a bottom plate, and the inductor 10 and the capacitors 11 including the columnar projections 14 are formed.
A box-shaped lid 15 for accommodating the inside is assembled.

In the noise filter configured as described above,
Since the terminal pins 13 are held by the columnar projections 14 provided on the plate surface of the insulating substrate 12, it is possible to reliably prevent the terminal pins 13 from floating due to heat during soldering.

In addition, each of the leads 10b-10
e, 11b, and 11c are drawn out in accordance with a predetermined circuit configuration, and are connected to the upper ends of the shafts of the terminal pins 13 exposed from the protruding ends of the columnar projections 14 so that the inductor 10 and the capacitor 11 are connected to the insulating substrate 12. Since it is mounted on the board surface, the circuit can be easily configured and the occurrence of connection failure can be reliably prevented.

The above-mentioned terminal pins 13 are, as shown in FIG.
It is preferable to assemble those provided by projecting from the axis 13b. Thus, the terminal pins 13 can be reliably prevented from coming off, and the lead wires 10b to 10e, 11b, 11c of the inductor 10 and the capacitor 11 can be positioned and connected.

In addition to the above-described configuration, as shown in FIGS. 3A and 3B, the terminal pins 1 protruding from the plate surface of the insulating substrate 12.
It is preferable to provide spacer projections 16 located around the axis of 3. With this, a gap can be secured between the electrical or electronic device manufacturer and the device substrate when the device is soldered and fixed to the device substrate, so that the influence of the heat of soldering can be more reliably prevented. The height is stable and spot soldering can be applied.

As shown in FIGS. 1 to 3A, the box-shaped lid 15 has projection edges 15a and 15b at its open end, and the projection edges 15a and 15b
12b is assembled to the insulating substrate 12 by fitting. The box-shaped lid 15 is fitted and fixed by projecting edges 15a, 15b... And notches 12a, 12b as shown in FIG.
Can be provided at the corners of the box-shaped lid 15 and the insulating substrate 12.

[0023]

As described above, according to the noise filter of the first aspect of the present invention, the required number of terminal pins to be held by exposing each shaft end from the protruding end of the columnar protrusion and the plate surface of the insulating substrate is provided. An insulating substrate provided with columnar projections is provided.The lead wires of the inductor and the capacitor are drawn out in accordance with a predetermined circuit configuration, and the inductor and the capacitor are connected to the shaft end of each terminal pin exposed from the protruding end of the columnar projection. By mounting a box-shaped lid with the insulating substrate as the bottom plate and the inductor and capacitor containing the columnar projections inside, it is possible to prevent the terminal pins from floating due to heat during soldering. In addition, the circuit can be easily formed from the inductor and the capacitor, and the occurrence of a connection failure can be reliably prevented.

According to the noise filter of the second aspect of the present invention, by providing the terminal pin having the flange portion facing the protruding end of the columnar projection, the terminal pin can be reliably prevented from coming off. Each lead wire of the capacitor can be positioned and connected.

According to the noise filter of the third aspect of the present invention, by providing the terminal pin integrally formed with the columnar projection by insert molding, the terminal pin can be easily mounted and the occurrence of detachment can be more reliably prevented. it can.

According to the noise filter of the fourth aspect of the present invention, by providing the spacer projections located around the axis of the terminal pin protruding from the plate surface of the insulating substrate, the manufacturer of the electric or electronic equipment can be provided. A gap can be secured between the board and the equipment board when soldering to the equipment board, and the effect of the heat of soldering can be more reliably prevented, and the soldering height is stable and spot soldering can be applied. .

[Brief description of the drawings]

FIG. 1 is a perspective view showing a noise filter according to the present invention with a box-shaped lid removed.

FIG. 2 is an explanatory diagram showing an example of a terminal pin provided in the noise filter.

FIG. 3a is a bottom view showing a noise filter according to an example of the present invention.

FIG. 3b is a side view showing the noise filter of FIG. 3a.

FIG. 4 is a bottom view showing a noise filter according to another example of the present invention.

FIG. 5A is an explanatory diagram illustrating a circuit configuration of a noise filter according to a general example.

FIG. 5B is an explanatory diagram showing a circuit configuration of a noise filter according to another general example.

FIG. 6a is a perspective view showing a noise filter according to a conventional example with a box-shaped lid removed.

FIG. 6b is a side view showing the noise filter of FIG. 6a.

FIG. 6c is a bottom view showing the noise filter of FIG. 6a.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Inductor 10b-10e Lead wire of an inductor 11 ... Capacitor 11b, 11c Lead wire of a capacitor 12 Insulating board 13 ... Terminal pin 13a Flange of a terminal pin 14 ... Columnar projection 15 Box-shaped lid 16 ... Spacing projection

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Tomoyuki Nakatsugawa 1-13-1 Nihonbashi, Chuo-ku, Tokyo TDC Corporation F term (reference) 5E070 AA05 AB10 DA01 DB02 DB08 EA08 5J024 AA01 DA01 DA25 EA08

Claims (4)

[Claims] An insulating substrate provided with a required number of columnar projections for exposing each shaft end from the protruding end of the columnar projection and a plate surface of the insulating substrate to hold a terminal pin is provided. Inductors are drawn out according to the circuit configuration, connected to the shaft end of each terminal pin exposed from the protruding end of the columnar projection, and the inductor and capacitor are mounted on the plate surface of the insulating substrate. And a box-shaped lid for accommodating a capacitor therein. 2. The noise filter according to claim 1, further comprising a terminal pin having a flange portion facing the protruding end of the columnar projection. 3. The semiconductor device according to claim 1, further comprising a terminal pin which is insert-molded integrally with the columnar projection.
The noise filter according to 1. 4. The noise filter according to claim 1, wherein a spacer projection is provided around an axis of a terminal pin protruding from a plate surface of the insulating substrate.