JP6627893B2 - Electronic components with lead wires - Google Patents

Description

  The present invention relates to an electronic component with a lead wire, and more particularly, to an electronic component with a lead wire including a capacitance element.

  As a conventional electronic component with a lead wire, for example, there is a three-terminal capacitor disclosed in Patent Document 1. In this three-terminal capacitor, a conductive plate is connected to one end of a chip capacitor, and a leg is connected to the other end of the chip capacitor. Further, in the three-terminal capacitor, two lead wires are connected to the conductive plate, and another lead wire is connected to the leg. The leads connected to the conductive plate are arranged to extend along both sides of the chip capacitor, the leads connected to the legs are located between the two leads connected to the conductive plate, It extends in parallel with the lead wire. The three-terminal capacitor has a bead core attached to a lead wire extending from a conductive plate, for example, and is used as a noise filter.

JP 2015-53448 A

  The noise filter is a circuit that passes necessary components of the current flowing through the signal line and removes unnecessary components, and a capacitor that is a capacitance element is used in a circuit configuration. However, in a noise filter using a capacitor, it is known that an equivalent series inductance (ESL: Equivalent Series Inductance) which is a parasitic inductance of the capacitor lowers a noise suppression effect. Even with the three-terminal capacitor disclosed in Patent Document 1, the noise suppression effect is reduced due to the influence of the parasitic inductance of the capacitor.

  In the case of a three-terminal capacitor, since a lead wire is connected to the leg, the inductance of one lead wire enters between the signal line and the ground electrode GND. Therefore, the three-terminal capacitor functions as a capacitor only up to the resonance frequency of the capacitor and the lead wire.

  Then, an object of the present invention is to provide an electronic component with a lead wire provided with a capacitance element, which can cancel the parasitic inductance of the capacitance element and the lead wire.

An electronic component with a lead wire according to one embodiment of the present invention includes a capacitance element, a first lead wire connected to one of a pair of electrodes formed in the capacitance element, and the other of a pair of electrodes formed in the capacitance element. And a first lead wire having one end as a first terminal and the other end as a second terminal, and at least one coil between the first terminal and the second terminal. part have a coil portion includes a connection point of the capacitance element.

  According to the present invention, since the first lead wire of the electronic component with the lead wire has at least one coil portion between the first terminal and the second terminal, it is possible to equivalently form a negative inductance. A coupling portion is formed, so that the parasitic inductance of the capacitance element and the second lead wire can be canceled, and a wider band can be realized.

FIG. 2 is a front view of the electronic component with leads according to Embodiment 1 of the present invention. FIG. 2 is a side view and a plan view of the electronic component with leads according to Embodiment 1 of the present invention. FIG. 2 is a circuit diagram showing an equivalent circuit of the electronic component with leads according to Embodiment 1 of the present invention. 5 is a graph showing transmission characteristics with respect to frequency of the electronic component with leads according to Embodiment 1 of the present invention. It is the front view, side view, and top view of the electronic component with a lead wire which concerns on the modification 1 of Embodiment 1 of this invention. It is the front view, side view, and top view of the electronic component with a lead wire which concerns on the modification 2 of Embodiment 1 of this invention. FIG. 10 is a diagram for explaining the method for manufacturing the electronic component with lead wires according to Embodiment 2 of the present invention. FIG. 11 is a diagram for explaining a method of manufacturing an electronic component with leads according to a modification of the second embodiment of the present invention. It is a front view of the electronic component with a lead wire concerning Embodiment 3 of this invention. FIG. 13 is a diagram for describing an electronic component with lead wires according to Embodiment 4 of the present invention. It is a front view of the electronic component with a lead wire concerning Embodiment 5 of this invention. FIG. 14 is a front view of an electronic component with lead wires according to Embodiment 6 of the present invention. It is a front view of the electronic component with a lead wire concerning Embodiment 7 of this invention. 16 is a graph illustrating transmission characteristics with respect to frequency of the electronic component with leads according to Embodiment 7 of the present invention. 2 is a graph showing transmission characteristics of the electronic component with leads shown in FIG. 1 with respect to frequency. It is a figure for explaining the motor using the electronic parts with lead wires concerning Embodiment 7 of the present invention. It is a perspective view of the electronic component with a lead wire concerning Embodiment 8 of this invention. 16 is a graph showing transmission characteristics with respect to frequency of the electronic component with leads according to Embodiment 8 of the present invention. It is a figure for explaining the motor using the electronic parts with lead wires concerning Embodiment 8 of the present invention.

Hereinafter, an electronic component with a lead wire according to an embodiment of the present invention will be described.
(Embodiment 1)
Hereinafter, an electronic component with a lead wire according to Embodiment 1 of the present invention will be described with reference to the drawings. FIG. 1 is a front view of an electronic component with lead wires according to Embodiment 1 of the present invention. FIG. 2 is a side view and a plan view of the electronic component with leads according to Embodiment 1 of the present invention. 2A is a side view of the electronic component with lead wires according to the first embodiment, and FIG. 2B is a plan view of the electronic component with lead wires according to the first embodiment. FIG. 3 is a circuit diagram showing an equivalent circuit of the electronic component with leads according to Embodiment 1 of the present invention.

  The electronic component with lead wires according to the first embodiment is, for example, a three-terminal capacitor 1. The three-terminal capacitor 1 can be used as a noise filter. First, as shown in FIG. 1, a three-terminal capacitor 1 includes a capacitor 2, a lead wire 3 (first lead wire) connected to an electrode 2 a formed on the capacitor 2, and an electrode 2 b formed on the capacitor 2. Is provided with a lead wire 4 (second lead wire).

  The capacitor 2 is a capacitance element, for example, a 3.2 mm × 2.5 mm × 2.5 mm chip capacitor. The capacitor 2 has a lead wire 3 connected to one electrode 2a of a pair of electrodes by soldering. A connection point between the electrode 2a and the lead wire 3 is defined as a connection point T1. The other electrode 2b is connected to the ground electrode GND3 via the lead wire 4. The lead wire 3 is connected to the electrode 2a at a substantially central portion, and both ends are arranged so as to extend along both side portions of the capacitor 2 and reach the respective terminals 3a and 3b. The lead wire 4 connects the terminal 4a, which is one end, to the electrode 2b, and extends from the terminal 4a to the terminal 4b. The lead wire 4 extending to the terminal 4b is located between the lead wire 3 reaching the terminal 3a (first terminal) and the lead wire 3 reaching the terminal 3b (second terminal). Extending. As the lead wires 3 and 4, for example, a Cu wire plated with Sn is used.

  As shown in FIG. 3, the capacitor 2 has an inductor L3 as a parasitic inductance (equivalent series inductance (ESL)) and a resistor R1 as a parasitic resistance (equivalent series resistance (ESR)). Therefore, the capacitor 2 is equivalent to a circuit configuration in which the inductor L3 and the resistor R1 are connected in series to the capacitor C. In the equivalent circuit shown in FIG. 3, the parasitic inductance and the parasitic resistance of the lead wire 4 are described as being included in the inductor L3 and the resistor R1.

  As shown in FIG. 1, the lead wire 3 has a coil portion 3c between a terminal 3a at one end and a terminal 3b at the other end. That is, the lead wire 3 has a portion of the coil portion 3c processed into a circular loop shape between the terminal 3a and the terminal 3b. The coil portion 3c is formed by winding the wiring of the lead wire 3 concentrically about 1.5 times in the front-rear direction of the drawing, and is connected to the electrode 2a of the capacitor 2 at the connection point T1. By winding the lead wire 3 about 1.5 times, a portion where two or more lead wires 3 are close to each other is formed, and the current direction in the portion becomes the same, so that a negative inductance is generated by magnetic coupling. The portion of the coil portion 3c connected to the electrode 2a of the capacitor 2 at the connection point T1 is a wiring located below the coil portion 3c as shown in FIG. Part of the coil 3c from the terminal 3a to the connection point T1 forms an inductor L1, and part of the coil 3c from the connection T1 to the terminal 3b forms an inductor L2. The equivalent circuit shown in FIG. 3 can be represented as a configuration in which the inductor L1 and the inductor L2 are connected to the connection point T1.

  The inductor L1 and the inductor L2 are tightly coupled, and a pseudo negative inductance component is generated. This negative inductance component can negate the parasitic inductance (inductor L3) of the capacitor 2 and the lead wire 4, and the apparent inductance component of the capacitor 2 and the lead wire 4 can be reduced. Even if the lead wire 3 serving as a signal line has the inductors L1 and L2, it does not enter between the signal line and the ground electrode GND3, and thus does not affect the self-resonance of the capacitor 2. Conversely, when a circuit composed of the capacitor 2, the inductor L1, and the inductor L2 is considered as a noise filter, the noise filter cancels a parasitic inductance (inductor L3) by a negative inductance component of the inductor L1 and the inductor L2. As a result, the self-resonant frequency is increased, and the effect of suppressing noise in a high-frequency band can be improved. That is, in the three-terminal capacitor 1, by providing the coil portion 3c on the lead wire 3, the parasitic inductance (inductor L3) of the capacitor 2 and the lead wire 4 can be canceled to realize a wider band, and noise in a high frequency band can be realized. The suppression effect can be improved.

  For example, the capacitor 2 has a capacitor C of 1.0 μF, an inductor L3 of 1 nH, and a resistor R1 of 0.01Ω. The inductors L1 and L2 are each 2 nH. Further, the coupling coefficient K12 between the inductor L1 and the inductor L2 is set to 0.5 (50%). In this case, the three-terminal capacitor 1 can cancel the 1 nH parasitic inductance of the inductor L3 by a negative inductance component (-1 nH) generated by coupling the 2 nH inductors L1 and L2 at 50%.

  Next, the three-terminal capacitor 1 shown in FIG. 1 is actually created, and the parasitic inductance of the capacitor 2 and the lead wire 4 is canceled by the negative inductance component of the coil portion 3c, thereby improving the noise suppression effect in the high frequency band. Explain that. FIG. 4 is a graph showing transmission characteristics with respect to frequency of the electronic component with leads according to Embodiment 1 of the present invention. The graph shown in FIG. 4 shows the result of measuring the transmission characteristics of the three-terminal capacitor 1 with respect to the frequency of the input signal, with the terminal 3a as the input terminal and the terminal 3b as the output terminal. In the graph shown in FIG. 4, a conventional two-terminal capacitor A having no coil portion, a conventional three-terminal capacitor B having no coil portion, and a chip capacitor C were actually created as comparative examples, and transmission with respect to frequency was performed. The results of measuring the characteristics are shown. In the graph shown in FIG. 4, the horizontal axis represents frequency Freq (GHz), and the vertical axis represents transmission characteristics S (dB).

  Referring to the transmission characteristics shown in FIG. 4, compared to the case where the chip capacitor C is mounted on the surface, the parasitic inductance of the two-terminal capacitor A with lead wire increases, the self-resonant frequency decreases, and the effect of suppressing noise in the high frequency band deteriorates. I have. The conventional three-terminal capacitor B having no coil has a higher self-resonant frequency than the two-terminal capacitor A, but does not reach the chip capacitor C. On the other hand, the three-terminal capacitor 1 according to the first embodiment has a higher self-resonant frequency than any of the conventional two-terminal capacitor A, the conventional three-terminal capacitor B, and the chip capacitor C, as shown in FIG. Has become. The transmission characteristics S of the three-terminal capacitor 1 are degraded at a frequency Freq (high frequency band) of 0.030 GHz or higher. Therefore, the three-terminal capacitor 1 can reduce the output signal of the frequency Freq of 0.030 GHz or more as compared with the conventional two-terminal capacitor A and the like, and can improve the noise suppression effect in the high frequency band. In particular, in the three-terminal capacitor 1, the transmission characteristic S is reduced by about 25 dB or more at the frequency Freq near 0.550 GHz, and the noise suppression effect in the high frequency band is greatly improved.

  As described above, in the three-terminal capacitor 1 according to the embodiment of the present invention, by providing the coil portion 3c on the lead wire 3, the parasitic inductance (the inductor L3) of the capacitor 2 and the lead wire 4 can be canceled. By realizing a wide band, the effect of suppressing noise in a high frequency band can be improved. In the case of an electronic component having a lead wire, such as the three-terminal capacitor 1, the lead wire can be used as a coupling coil without providing a separate wiring or canceling a component in order to cancel a parasitic inductance. Is relatively easy.

  Although the capacitor 2 has been described as a chip capacitor, it may be a multilayer ceramic capacitor mainly composed of BaTiO3 (barium titanate) or a multilayer ceramic capacitor mainly composed of other materials. Further, the capacitor 2 is not limited to a multilayer ceramic capacitor, but may be another type of capacitor such as an aluminum electrolytic capacitor.

  As shown in FIG. 1, the shape of the coil portion 3c from the terminal 3a to the connection point T1 is substantially the same as the shape from the connection point T1 to the terminal 3b, and the sizes of the inductors L1 and L2 are the same. Although the case has been described, the present invention is not limited to this. For example, the shape from the terminal 3a to the connection point T1 may be different from the shape from the connection point T1 to the terminal 3b. Further, the coil portion 3c has been described as a circular coil as shown in FIG. 1, but is not limited to this. The coil portion 3c may have any shape as long as it can obtain a negative inductance component that can cancel the parasitic inductance (the inductor L3). For example, the coil portion 3c may be a track-shaped or triangular-shaped coil. Is also good. Further, the coil portion provided on the lead wire 3 is not limited to one coil portion 3c as shown in FIG. 1, and two or more coil portions may be provided.

(Modification 1)
Next, an electronic component with a lead wire according to a first modification of the first embodiment will be described. FIG. 5 is a front view, a side view, and a plan view of an electronic component with leads according to a first modification of the first embodiment of the present invention. Here, FIG. 5A is a front view of an electronic component with lead wires according to the first modification, FIG. 5B is a side view of the electronic component with lead wires according to the first modification, and FIG. 1 shows plan views of an electronic component with lead wires according to Example 1. FIG. The electronic component with a lead wire according to the first modification is, for example, a three-terminal capacitor 1a. In the three-terminal capacitor 1a, the same components as those of the three-terminal capacitor 1 are denoted by the same reference numerals, and detailed description is omitted.

  In the three-terminal capacitor 1a, the lead wire 3 has a coil portion 3d as shown in FIG. The coil part 3d is formed by winding the wiring of the lead wire 3 in a concentric circle about 2.5 times in the front-rear direction of the drawing, and has a larger inductance than the coil part 3c shown in FIG. Therefore, in the three-terminal capacitor 1a, even if the capacitor 2 having a large parasitic inductance is used, the parasitic inductance can be canceled.

  However, the portion of the coil portion 3d connected to the electrode 2a of the capacitor 2 at the connection point T1 is a single wire located below the coil portion 3d as shown in FIG. If the wiring of the lead wire 3 is wound twice or more, there are a plurality of wirings of the lead wire 3 located below the coil portion 3d. Therefore, it is necessary that the wiring connected to the electrode 2a at the connection point T1 is separated from the wiring not connected to the electrode 2a by at least 1 mm.

  In the coil portion 3d shown in FIG. 5B, the shape from the terminal 3a to the connection point T1 is smaller than the shape from the connection point T1 to the terminal 3b, so that the wiring connected to the electrode 2a at the connection point T1. In contrast, the wiring not connected to the electrode 2a is located slightly above and at least 1 mm away. Therefore, the wiring that is not connected to the electrode 2a does not come into contact with the capacitor 2 below the coil portion 3d, and the danger that the lead wire 3 is short-circuited can be avoided.

(Modification 2)
Next, an electronic component with a lead wire according to a second modification of the first embodiment will be described. FIG. 6 is a front view, a side view, and a plan view of an electronic component with leads according to Modification 2 of Embodiment 1 of the present invention. Here, FIG. 6A is a front view of an electronic component with leads according to Modification 2, FIG. 6B is a side view of the electronic component with leads according to Modification 2, and FIG. FIGS. 2A and 2B are plan views of electronic components with lead wires according to Example 2. FIGS. An electronic component with a lead wire according to Modification 2 is, for example, a three-terminal capacitor 1b. In the three-terminal capacitor 1b, the same components as those of the three-terminal capacitor 1 are denoted by the same reference numerals, and detailed description will be omitted.

  In the three-terminal capacitor 1b, the lead wire 3 has a coil portion 3e as shown in FIG. The coil part 3e differs from the coil part 3c shown in FIG. 1 in that the winding center of the lead wire 3 is not in the front-back direction but in the vertical direction in the drawing. Therefore, unlike the coil portion 3c shown in FIG. 1, the coil portion 3e does not spread in the vertical direction of the drawing but spreads in the front-rear direction. Therefore, when the three-terminal capacitor is mounted, there is a limit in the height direction. This is also an advantageous structure.

  The three-terminal capacitor 1b has a structure in which a lead wire 3 for inputting a signal and a lead wire 4 connected to the ground electrode GND3 are orthogonal to each other, as shown in FIG. For example, when a three-terminal capacitor is inserted into a power supply line, a straight power supply line is cut, and a three-terminal capacitor is inserted therebetween. As shown in FIG. 1, if the three-terminal capacitor 1 has a structure in which the lead wire 3 reaching the terminals 3a and 3b and the lead wire 4 reaching the terminal 4b are parallel, the lead wire 3 reaching the terminals 3a and 3b is Since it is bent at 90 degrees and inserted into the power supply line, the three-terminal capacitor 1 may protrude greatly from the power supply line to take up space. However, if the three-terminal capacitor 1b has a structure in which the lead wire 3 and the lead wire 4 are orthogonal to each other, the lead wire 3 is located on the same line with respect to the power supply line. it can.

  In the three-terminal capacitor 1b shown in FIG. 6, a capacitor 2A having a pair of electrodes 2a and 2b formed in a short direction is used instead of the capacitor 2 having a pair of electrodes 2a and 2b formed in a longitudinal direction. . Therefore, the three-terminal capacitor 1b has a more advantageous structure in the height direction of the drawing.

(Embodiment 2)
In the first embodiment of the present invention, a three-terminal capacitor 1 in which one lead wire 3 is processed into a circular loop shape to form a coil portion 3c as shown in FIG. 1 has been described. However, instead of processing one lead wire to form a coil portion, a coil portion may be formed by combining a plurality of lead wires. Therefore, in a second embodiment of the present invention, a three-terminal capacitor in which a coil portion is formed by combining a plurality of lead wires will be described. FIG. 7 is a view for explaining a method for manufacturing an electronic component with leads according to Embodiment 2 of the present invention.

  The electronic component with a lead wire shown in FIG. 7 is, for example, a three-terminal capacitor 1c. First, as shown in FIG. 7A, three lead wires are prepared. The lead wire 3A, the lead wire 4, and the lead wire 3B are shown from the right side of the drawing. In the three-terminal capacitor 1c, the same components as those of the three-terminal capacitor 1 are denoted by the same reference numerals, and detailed description thereof will be omitted.

  Next, as shown in FIG. 7B, one end of the lead wire 3B is bent in a circular shape in the direction toward the lead wire 3A. Further, as shown in FIG. 7C, one end of the lead wire 3A is bent in a circular shape toward the lead wire 3B. Note that the circular portion of the lead wire 3A and the circular portion of the lead wire 3B do not directly overlap, but are formed to be shifted in the front-rear direction in the drawing. Therefore, when the circular portion of the lead wire 3A is connected to the circular portion of the lead wire 3B, one coil portion 3f is formed.

  Next, as shown in FIG. 7D, the capacitor 2 is connected to a gap between the circular portion of the lead wire 3A, the circular portion of the lead wire 3B, and the lead wire 4, thereby forming three terminals. The mold capacitor 1c is completed. That is, the lead wire 3 of the three-terminal capacitor 1c is composed of two lead wires 3A and 3B. The lead 3A extends from the terminal 3a to the capacitor 2 to form a part of the inductor L1 in the coil 3f, and the lead 3B extends from the capacitor 2 to the terminal 3b to form a part of the inductor L2 in the coil 3f. I have.

  Thus, the processing of a lead wire is facilitated by forming a coil part by combining a plurality of lead wires, instead of forming a coil part by processing one lead wire into a circular loop shape. Therefore, there is an advantage that manufacturing is simplified. Further, as shown in FIG. 7D, the capacitor 2 can be supported at the three ends of each of the lead wires 3A, 4 and 3B, so that the capacitor 2 can be stably connected. There are also benefits that you can do.

(Modification)
In the second embodiment of the present invention, the three-terminal capacitor 1c in which the coil portions 3f are formed by bending the two lead wires 3A and 3B into circular shapes as shown in FIG. 7 has been described. However, the shape of the coil portion is not limited to a circular shape, and may be another shape. Therefore, in a modification of the second embodiment of the present invention, a three-terminal capacitor in which each end of the lead wires 3A and 3B is bent into a triangular shape to form a coil portion will be described. FIG. 8 is a view for explaining a method for manufacturing an electronic component with leads according to a modification of the second embodiment of the present invention.

  The electronic component with a lead wire shown in FIG. 8 is, for example, a three-terminal capacitor 1d. First, as shown in FIG. 8A, three lead wires are prepared. The lead wire 3A, the lead wire 4, and the lead wire 3B are shown from the right side of the drawing. In the three-terminal capacitor 1d, the same components as those of the three-terminal capacitor 1 are denoted by the same reference numerals, and detailed description thereof will be omitted.

  Next, as shown in FIG. 8B, one end of the lead wire 3B is bent in the direction toward the lead wire 3A to form one side. Further, as shown in FIG. 8C, a portion before the portion bent in FIG. 8B is bent in the direction toward the lead wire 3A to form one side. Similarly, as shown in FIG. 8D, one end of the lead wire 3A is bent in the direction toward the lead wire 3B to form one side. Further, as shown in FIG. 8E, a portion before the portion bent in FIG. 8D is bent in the direction toward the lead wire 3B to form one side. Note that the triangular portion of the lead wire 3A and the triangular portion of the lead wire 3B do not directly overlap, but are formed shifted in the front-rear direction in the drawing. Therefore, when the triangular portion of the lead wire 3A and the triangular portion of the lead wire 3B are connected, one coil portion 3g is formed.

  Next, as shown in FIG. 8F, the ends of the lead wires 3A and 3B are slightly cut. Then, as shown in FIG. 8 (g), the capacitor 2 is connected to the gap between the triangular portion of the lead wire 3A, the triangular portion of the lead wire 3B, and the lead wire 4 to form a three-terminal type. The capacitor 1d is completed. That is, the lead wire 3 of the three-terminal capacitor 1d is composed of two lead wires 3A and 3B. A portion from the terminal 3a to the capacitor 2 is a lead wire 3A and forms part of the inductor L1 in the coil portion 3g, and a portion from the capacitor 2 to the terminal 3b is a lead wire 3B and forms a part inductor L2 in the coil portion 3g. I have.

  As described above, by forming a triangular coil portion by combining a plurality of lead wires, the processing of the lead wire is further facilitated as compared with the case of forming a circular coil portion, and an advantage that manufacturing is simplified. There is.

(Embodiment 3)
In the first embodiment of the present invention, a three-terminal capacitor 1 in which one lead wire 3 is processed into a circular loop shape to form a coil portion 3c as shown in FIG. 1 has been described. However, instead of forming the coil portion on one lead wire, the coil portion may be formed separately and combined with the lead wire to form a three-terminal capacitor. Therefore, in a third embodiment of the present invention, a three-terminal capacitor formed by forming a coil portion on a substrate and combining with a lead wire will be described. FIG. 9 is a front view of an electronic component with leads according to Embodiment 3 of the present invention.

  The electronic component with a lead wire shown in FIG. 9 is, for example, a three-terminal capacitor 1e. In the three-terminal capacitor 1e, the same components as those of the three-terminal capacitor 1 are denoted by the same reference numerals, and detailed description thereof will be omitted.

  The three-terminal capacitor 1e shown in FIG. 9 includes a coil portion 3h formed on the alumina substrate 5. The coil portion 3h includes a circular wiring pattern 51 on one surface of the alumina substrate 5, a through hole 52 at a connection point T1 connected to the electrode 2a of the capacitor 2, and a circular wiring pattern 53 on the opposite surface of the alumina substrate 5. ing. That is, the coil portion 3h is a coupling coil in which the wiring pattern 51 and the wiring pattern 53 are connected by the through holes 52. The wiring pattern 51 forms the inductor L2, and the wiring pattern 53 forms the inductor L1.

  Further, a terminal portion 54 for connecting the wiring pattern 51 and the lead wire 3B, a terminal portion 55 for connecting to the electrode 2b of the capacitor 2, and the wiring pattern 53 and the lead wire 3A are connected to the alumina substrate 5. Also, a terminal portion 56 is formed. The terminals 54, 55, 56 are formed of a metal lead frame.

  As described above, in the three-terminal capacitor 1e according to the third embodiment of the present invention, since the lead wire is formed in combination with the coil portion 3h formed on the alumina substrate 5, there is no need to process the lead wire, and the manufacturing is completed. Has the advantage of being simpler.

(Embodiment 4)
In the first embodiment of the present invention, as shown in FIG. 1, a description will be given of a three-terminal capacitor 1 in which the lead wires 3 and 4 connected to the capacitor 2 are formed of a material of the same standard (line thickness, material, etc.). did. However, the lead wire 3 and the lead wire 4 do not need to be formed of the same standard material, and a three-terminal capacitor may be formed with different standard lead wires. Therefore, in a fourth embodiment of the present invention, a description will be given of a three-terminal capacitor formed with lead wires of different standards. FIG. 10 is a view for explaining an electronic component with lead wires according to Embodiment 4 of the present invention.

  The electronic component with lead wires according to the fourth embodiment is, for example, a three-terminal capacitor 1. In the example shown in FIG. 10, the three-terminal capacitor 1 is used for the motor 6. Specifically, the terminal 3a of the three-terminal capacitor 1 is connected to the terminal 61, the terminal 3b of the three-terminal capacitor 1 is connected to the motor 6, and the terminal 4a of the three-terminal capacitor 1 is connected to the ground electrode GND. A large current of 10 A or more supplied to the motor flows through the lead wire 3 from the terminal 3a to the terminal 3b, but a noise component of 1 A or less flows through the lead wire 4 from the terminal 4a to the ground electrode GND.

  However, when the capacitor 2 is broken, the lead wire 3 and the lead wire 4 are short-circuited, a large current flowing through the lead wire 3 flows through the lead wire 4, and there is a possibility that a serious failure is multiplied. Therefore, in the three-terminal capacitor 1 according to the fourth embodiment of the present invention, the lead wire 4 is made thinner than the lead wire 3 or a different material is used to make the lead wire 4 different in standard. Has a function as a fuse.

  As the lead wire, for example, a Cu wire plated with Sn or a Fe wire (CP wire) plated with Cu or Sn is used. When the three-terminal capacitor 1 is used for, for example, a motor 6 mounted on a vehicle, a Cu wire having a diameter of 0.78 mm is used for the lead wire 3 assuming that a current of 10 A to 30 A flows.

  On the other hand, in the three-terminal capacitor 1 according to the fourth embodiment, when the lead wire 3 and the lead wire 4 are short-circuited and 10 A to 30 A flow through the lead wire 4, a standard material that is blown as a fuse is read. Used for line 4. Specifically, a CP wire having a diameter of 0.50 mm and having a diameter of 0.50 mm is used as the lead wire 4 when a current of about 9 A flows.

  As described above, in the three-terminal capacitor 1 according to the fourth embodiment, even when the lead wire 4 that only flows a current of at most about several A is short-circuited with the lead wire 3, the lead wire 4 is blown. Function as a fuse to avoid a serious failure.

(Embodiment 5)
In the first embodiment of the present invention, a three-terminal capacitor 1 in which one lead wire 3 is processed into a circular loop shape to form a coil portion 3c as shown in FIG. 1 has been described. However, instead of forming the coil portion by winding the wiring of the lead wire 3 concentrically in the front-rear direction of the drawing like the coil portion 3c, the coil portion is formed by winding the wiring of the lead wire in a loop on the same plane. May be. Therefore, in a fifth embodiment of the present invention, a description will be given of a three-terminal capacitor in which a coil portion is formed by winding a lead wire in a loop on the same plane. FIG. 11 is a front view of an electronic component with leads according to Embodiment 5 of the present invention.

  The electronic component with a lead wire shown in FIG. 11 is, for example, a three-terminal capacitor 1f. In the three-terminal capacitor 1f, the same components as those of the three-terminal capacitor 1 are denoted by the same reference numerals, and detailed description thereof will be omitted.

  As shown in FIG. 11, the lead wire 3 has a coil portion 3i between a terminal 3a at one end and a terminal 3b at the other end. That is, the lead wire 3 has a portion of the coil portion 3i formed into a circular loop on the same plane between the terminal 3a and the terminal 3b. The coil portion 3i is formed by winding the wiring of the lead wire 3 about 2.5 times on the same plane, and is connected to the electrode 2a of the capacitor 2 at a connection point T1. Therefore, a part of the coil part 3c from the terminal 3a to the connection point T1 forms the inductor L1, and a part of the coil part 3c from the connection point T1 to the terminal 3b forms the inductor L2. In the middle of the lead wire 3 reaching the terminal 3a, there is provided a portion that straddles the portion of the coil portion 3i that is processed in a loop shape in order to avoid a short circuit between the lead wires.

  As described above, in the three-terminal capacitor 1 according to the fifth embodiment of the present invention, the wiring of the lead wire 3 is wound in a loop on the same plane to form the coil portion 3i. There is an advantage that can be reduced.

(Embodiment 6)
In the first embodiment of the present invention, a three-terminal capacitor 1 in which one lead wire 3 is processed into a circular loop shape to form a coil portion 3c as shown in FIG. 1 has been described. However, not only the lead wire 3 may be formed into a circular loop to form the coil portion 3c, but the lead wire 4 may be formed into a circular loop to form the coil portion. Thus, in a sixth embodiment of the present invention, an electronic component with a lead wire in which two lead wires are processed into a circular loop shape to form a coil portion will be described. FIG. 12 is a front view of an electronic component with lead wires according to Embodiment 6 of the present invention.

  The electronic component with a lead wire shown in FIG. 12 is, for example, a four-terminal capacitor 1g. In the four-terminal capacitor 1g, the same components as those of the three-terminal capacitor 1 are denoted by the same reference numerals, and detailed description thereof will be omitted.

  The four-terminal capacitor 1g shown in FIG. 12 also has a coil portion on the lead wire 4 unlike the three-terminal capacitor 1 shown in FIG.

  As shown in FIG. 12, the lead wire 4 has a coil portion 4c between a terminal 4a at one end and a terminal 4b at the other end. That is, the lead wire 4 has a portion of the coil portion 4c processed into a circular loop shape between the terminal 4a and the terminal 4b. The coil part 4c is formed by winding the wiring of the lead wire 4 in a concentric circle about 1.5 times in the front-rear direction of the drawing, and is connected to the electrode 2b of the capacitor 2 at a connection point T2. By winding the lead wire 4 approximately 1.5 times, a portion where two or more lead wires 4 are close to each other is formed, and the current direction in the portion becomes the same, so that a negative inductance is generated by magnetic coupling. The portion of the coil portion 4c connected to the electrode 2b of the capacitor 2 at the connection point T2 is a wiring located above the coil portion 4c. Therefore, part of the coil part 4c from the terminal 4a to the connection point T2 forms the inductor L4, and part of the coil part 4c from the connection point T2 to the terminal 4b forms the inductor L5.

  The inductor L4 and the inductor L5 are tightly coupled, and a pseudo negative inductance component is generated. This negative inductance component can negate the parasitic inductance (inductor L3) of the capacitor 2, and together with the inductors L1 and L2 of the coil portion 3c, the inductance component of the capacitor 2 can be apparently reduced.

  As described above, in the four-terminal capacitor 1g according to the sixth embodiment, the two lead wires 3 and 4 are processed into a circular loop to form the coil portions 3c and 4C, respectively. The inductance (inductor L3) can be canceled out and a wide band can be realized, and the noise suppression effect in a high frequency band can be improved. The four-terminal capacitor 1g can be used as an X capacitor, for example, by inserting it between the AC power supply lines of the motor.

(Embodiment 7)
In the first embodiment of the present invention, as shown in FIG. 1, the three-terminal capacitor 1 in which the lead wires 3 and 4 connected to the capacitor 2 are formed by wiring having the same shape (such as the width of the wiring) has been described. However, there is only one condition under which the negative inductance component of the coil portion 3c can completely cancel the parasitic inductance of the capacitor 2 and the lead wire 4 to make the inductance component 0 (zero). Therefore, ideally, it is desirable to match the parasitic inductance of the capacitor 2 and the lead wire 4 with the same value as the negative inductance component. The parasitic inductance of the capacitor 2 has a certain value depending on the product, but the parasitic inductance of the lead wire 4 varies depending on the cut position of the lead wire 4, the amount of solder connected to the capacitor 2, and the like. Therefore, for example, when the parasitic inductance of the lead wire 4 changes due to the variation in the length of the lead wire 4, the noise suppression effect in a high frequency band may be reduced. Therefore, in a seventh embodiment of the present invention, a configuration will be described in which a reduction in the noise suppression effect in a high frequency band due to a change in the length of the lead wire 4 or the like is suppressed. FIG. 13 is a front view of an electronic component with leads according to Embodiment 7 of the present invention. The electronic component with lead wires according to Embodiment 7 of the present invention is, for example, a three-terminal capacitor 1h. In the three-terminal capacitor 1h, the same components as those of the three-terminal capacitor 1 are denoted by the same reference numerals, and detailed description is omitted.

  As shown in FIG. 13, the three-terminal capacitor 1h is connected to the capacitor 2, a lead 3 (first lead) connected to an electrode 2a formed on the capacitor 2, and a lead 2 connected to an electrode 2b formed on the capacitor 2. Lead wire 4 (second lead wire). However, the three-terminal capacitor 1h is different from the three-terminal capacitor 1 shown in FIG. 1, and the lead wire 4 is constituted by the wiring 4d1 and the wiring 4d2. The width of the wiring 4d2 is wider than that of the wiring 4d1. The wiring 4d2 is a plate-shaped wiring in FIG. 13, and has a configuration connected to the wiring 4d1 connected to the electrode 2b formed on the capacitor. By using the plate-shaped wiring 4d2 as a part of the lead wire 4, the parasitic inductance per unit length can be reduced. For example, even when the cut position of the wiring 4d2 in the lead wire 4 changes, Variations in the parasitic inductance of the lead wire 4 can be suppressed. In addition, by reducing the parasitic inductance of the wiring 4d2, the length of the lead wire 4 that can cancel the parasitic inductance can be increased, and the lead wire 4 used as a GND wire is made longer to improve workability. Can be done.

  The wiring 4d2 does not need to be a separate member from the wiring 4d1, and may be formed by processing a part of the lead wire 4 into a plate shape. Further, the shape of the wiring 4d2 does not need to be a plate shape, and may be a shape of a wiring thicker than the wiring 4d1. That is, the wiring 4d2 only needs to have a shape in which at least the width of the wiring in one direction is wider than the width of the wiring 4d1.

  Specifically, it will be described that the three-terminal capacitor 1h using the wiring 4d2 as a part of the lead wire 4 can suppress the reduction of the noise suppression effect in the high frequency band with respect to the fluctuation of the length of the lead wire 4. . FIG. 14 is a graph showing transmission characteristics with respect to frequency of the electronic component with leads according to Embodiment 7 of the present invention. FIG. 15 is a graph illustrating transmission characteristics with respect to frequency of the electronic component with lead wires illustrated in FIG. 1 for comparison. The graphs shown in FIGS. 14 and 15 show the results of measuring the transmission characteristics of the three-terminal capacitors 1h and 1 with respect to the frequency of the input signal, using the terminal 3a as an input terminal and the terminal 3b as an output terminal. In the graphs shown in FIGS. 14 and 15, the horizontal axis represents the frequency Freq (GHz), and the vertical axis represents the transmission characteristic S (dB).

  In the three-terminal capacitor 1 shown in FIG. 1, when the length of the lead wire 4 from the capacitor 2 becomes 5.1 mm, the parasitic inductance of the capacitor 2 and the lead wire 4 is reduced by the negative inductance component of the coil portion 3c. Can be countered. Therefore, the transmission characteristics shown in FIG. 15 show a case where the length of the lead wire 4 from the capacitor 2 is set to 5.1 mm (graph F). Note that the thickness of the lead wire 4 is 0.78 mm. In addition, the graph shown in FIG. 15 also shows a result (graph E) of measuring the transmission characteristics with respect to the frequency of a conventional two-terminal capacitor having no coil portion as a comparative example. Further, in the graph shown in FIG. 15, the transmission characteristics when the length of the lead wire 4 becomes 5.1 ± 1 mm by changing the cut position of the lead wire 4 are shown in the graph F1 by 5.1 ± 2 mm. The transmission characteristics in the case of are shown in graph F2. For example, when the frequency Freq is 0.100 GHz (100 MHz), the transmission characteristic S is reduced by about 68 dB if the cut position of the lead wire 4 is not changed, but if the length is changed by ± 1 mm, the transmission characteristic S is only about 50 dB. If the length does not decrease and the length changes by ± 2 mm, the transmission characteristic S decreases by only about 40 dB.

  On the other hand, in the three-terminal capacitor 1h shown in FIG. 13, when the length of the lead wire 4 from the capacitor 2 becomes 8.3 mm, the parasitic inductance of the capacitor 2 and the lead wire 4 is caused by the negative inductance component of the coil portion 3c. Inductance can be canceled. Therefore, the transmission characteristics shown in FIG. 14 show the case where the length of the lead wire 4 from the capacitor 2 is 8.3 mm (graph H). Although the thickness of the wiring 4d1 of the lead wire 4 is 0.78 mm, it is a plate-shaped wiring 4d2 having a width of 6 mm from the middle. By using the plate-shaped wiring 4d2, the length of the lead wire 4 that can cancel the parasitic inductance can be increased to 8.3 mm. In addition, the graph shown in FIG. 14 also shows, as a comparative example, a result (graph E) of measuring transmission characteristics with respect to the frequency of a conventional two-terminal capacitor having no coil portion. Further, in the graph shown in FIG. 14, the transmission characteristics when the cut position of the lead wire 4 fluctuates and the length of the lead wire 4 becomes 8.3 ± 1 mm are shown in the graph H1 by 8.3 ± 2 mm. The transmission characteristics in the case of are shown in graph H2. For example, when the frequency Freq is 0.100 GHz (100 MHz), the transmission characteristic S decreases by about 65 dB unless the cut position of the lead wire 4 changes, and the transmission characteristic S decreases by about 60 dB even when the length fluctuates ± 1 mm. The transmission characteristic S is reduced by about 55 dB even if the length is changed by ± 2 mm. In other words, the three-terminal capacitor 1h has a sufficient high-frequency band noise suppression effect by using the plate-shaped wiring 4d2 as a part of the lead wire 4 even if the cut position of the wiring 4d2 in the lead wire 4 fluctuates. Is obtained. The direction of the plate-shaped wiring 4d2 is the horizontal direction in the drawing in FIG. 13, but the same effect can be obtained even in the front-rear direction in the drawing.

  Next, the case where the three-terminal capacitor 1h is used for the motor 6 will be described. FIG. 16 is a view for explaining a motor using an electronic component with leads according to Embodiment 7 of the present invention. Each of the two terminals of the motor 6 shown in FIG. 16 is provided with a three-terminal capacitor 1h. In the three-terminal capacitor 1h, the terminal 3b is connected to the terminal of the motor 6, and the plate-shaped wiring 4d2 forming a part of the lead wire 4 is connected to the housing of the motor 6. The three-terminal capacitor 1h is attached to the motor 6 as shown in FIG. 16 by making the lead wire 4 longer by using a plate-shaped wiring 4d2. Therefore, as compared with the case where a three-terminal capacitor having a short lead wire 4 is attached to the motor 6, it is more workable to attach a three-terminal capacitor 1h having a longer lead wire 4 to the motor 6 using the plate-shaped wiring 4d2. Can be improved.

  Thus, in the three-terminal capacitor 1h according to the seventh embodiment, at least the other end of the lead wire 4 (the second lead wire) is connected to the other end connected to the capacitor 2 side. The wiring 4d2 is provided so as to increase the width of the lead wire 4. Therefore, the parasitic inductance per unit length of the lead wire 4 is reduced, and a sufficient high-frequency band of the lead wire 4 against fluctuations in the cut position of the wiring 4d2 is obtained. A noise suppression effect is obtained.

(Embodiment 8)
In the seventh embodiment of the present invention, as shown in FIG. 13, by using a plate-shaped wiring 4d2 for the lead wire 4 connected to the capacitor 2, noise in a high frequency band with respect to fluctuations in the length of the lead wire 4 is suppressed. The configuration for suppressing the reduction in the effect has been described. However, even in a configuration other than using the plate-shaped wiring 4d2 for the lead wire 4, it is possible to suppress a decrease in the noise suppression effect in a high frequency band due to a change in the length of the lead wire 4 or the like. Therefore, in an eighth embodiment of the present invention, another configuration for suppressing a decrease in the noise suppression effect in a high frequency band due to a change in the length of the lead wire 4 or the like will be described. FIG. 17 is a perspective view of an electronic component with lead wires according to Embodiment 8 of the present invention. The electronic component with lead wires according to Embodiment 8 of the present invention is, for example, a three-terminal capacitor 1i. In the three-terminal capacitor 1i, the same components as those of the three-terminal capacitor 1 are denoted by the same reference numerals, and detailed description is omitted.

  As shown in FIG. 17, the three-terminal capacitor 1i is connected to the capacitor 2, a lead 3 (first lead) connected to an electrode 2a formed on the capacitor 2, and a lead 2 connected to an electrode 2b formed on the capacitor 2. A plurality of lead wires 4e and 4f (a plurality of second lead wires). The three-terminal capacitor 1i is different from the three-terminal capacitor 1 shown in FIG. 1 in that two lead wires 4e and 4f are connected to the electrode 2b of the capacitor 2 instead of one lead wire 4. is there. By using two leads 4e and 4f instead of one lead 4, the parasitic inductance per unit length can be reduced, for example, when the cut positions of the leads 4e and 4f fluctuate. However, variation in the parasitic inductance of the lead wires 4e and 4f can be suppressed. Also, by reducing the parasitic inductance of the lead wires 4e and 4f, the length of the lead wires 4e and 4f capable of canceling the parasitic inductance can be lengthened, and the lead wires 4e and 4f used as the GND wire can be further increased. Longer workability can be improved.

  In the three-terminal capacitor 1i, two lead wires 4e and 4f are used instead of one lead wire 4. However, the present invention is not limited to the two lead wires and two or more lead wires may be used. It may be configured to connect to the electrode 2b of the capacitor 2 respectively. In addition, the shape of each of the plurality of lead wires does not need to be the same as the shape of the lead wire 4, and at least the width of the wiring in one direction is wider than the width of the lead wire 4 as described in the seventh embodiment. It may be.

  Specifically, a three-terminal capacitor 1i using two lead wires 4e and 4f instead of one lead wire 4 provides a high-frequency noise suppression effect against fluctuations in the length of the lead wires 4e and 4f. The fact that a decrease in the number of pixels can be suppressed will be described. FIG. 18 is a graph showing transmission characteristics with respect to frequency of the electronic component with leads according to Embodiment 8 of the present invention. The graph shown in FIG. 18 shows the results of measuring the transmission characteristics of the three-terminal capacitor 1i with respect to the frequency of the input signal, using the terminal 3a as the input terminal and the terminal 3b as the output terminal. In the graph shown in FIG. 18, the horizontal axis represents the frequency Freq (GHz), and the vertical axis represents the transmission characteristics S (dB).

  In the three-terminal capacitor 1i shown in FIG. 17, when the length of each of the lead wires 4e and 4f from the capacitor 2 is 9.6 mm, the negative inductance component of the coil portion 3c causes the capacitor 2 and the lead wires 4e and 4f. Parasitic inductance can be canceled. Therefore, the transmission characteristics shown in FIG. 18 show the case where the length of each of the lead wires 4e and 4f from the capacitor 2 is 9.6 mm (Graph I). Although the thickness of each of the lead wires 4e and 4f is 0.78 mm, the use of two lead wires 4e and 4f allows the parasitic inductance per unit length to be one lead wire 4. It is about half as compared. Therefore, the length of each of the lead wires 4e and 4f that can cancel the parasitic inductance can be increased to 9.6 mm. The graph shown in FIG. 18 also shows, as a comparative example, a result (graph E) of measuring transmission characteristics with respect to frequency of a conventional two-terminal capacitor having no coil portion. Further, the graph shown in FIG. 18 is a graph showing the transmission characteristics when the cut positions of the lead wires 4e and 4f fluctuate and the lengths of the lead wires 4e and 4f become 9.6 ± 1 mm. The transmission characteristics when I1 is 9.6 ± 2 mm are shown in graph I2. For example, when the frequency Freq is 0.100 GHz (100 MHz), if the cut positions of the lead wires 4e and 4f do not change, the transmission characteristic S decreases by about 60 dB, and even if the length changes ± 1 mm, the transmission characteristic S decreases. The transmission characteristic S is reduced by about 51 dB even when the length is changed by 2 mm. In other words, the three-terminal capacitor 1I uses two lead wires 4e and 4f instead of one lead wire 4 to provide a sufficient high frequency even if the cut position of each of the lead wires 4e and 4f fluctuates. A band noise suppression effect is obtained.

  Next, a case where the three-terminal capacitor 1I is used for the motor 6 will be described. FIG. 19 is a diagram for explaining a motor using an electronic component with lead wires according to Embodiment 8 of the present invention. Each of the two terminals of the motor 6 shown in FIG. 19 is provided with a three-terminal capacitor 1I. In the three-terminal capacitor 1I, the terminal 3b is connected to the terminal of the motor 6, and the two lead wires 4e and 4f are connected to the housing of the motor 6. The three-terminal capacitor 1I has two lead wires 4e and 4f instead of one lead wire 4e and 4f to make the respective lead wires 4e and 4f longer, and is attached to the motor 6 as shown in FIG. I have. Therefore, the workability can be improved by attaching the three-terminal capacitor 1I having the long lead wires 4e and 4f to the motor 6 as compared with the case where the three-terminal capacitor having the short lead wire is attached to the motor 6.

  As described above, in the three-terminal capacitor 1I according to the eighth embodiment, the second lead is the two leads 4e and 4f, and each of the leads 4e and 4f is connected to the electrode 2b of the capacitor 2 respectively. The parasitic inductance per unit length of the connected lead wires 4e, 4f can be reduced, and a sufficient high-frequency band noise suppression effect can be obtained even when the cut position of the lead wires 4e, 4f fluctuates.

  The embodiments disclosed this time are to be considered in all respects as illustrative and not restrictive. The scope of the present invention is defined by the terms of the claims, rather than the description above, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

  1 3-terminal capacitor, 2 capacitors, 3, 4 lead wires, L1 to L5 inductors, R1 resistor.

Claims (8)

A capacitance element;
A first lead wire connected to one of a pair of electrodes formed on the capacitance element;
A second lead wire connected to the other of the pair of electrodes formed on the capacitance element,
Wherein the first lead, one end first terminal, the other end a second terminal, have at least one coil portion between said first terminal and said second terminal,
The electronic component with a lead wire , wherein the coil portion includes a connection point with the capacitance element .   The electronic component with lead wires according to claim 1, wherein one end of the second lead wire is connected to the other of a pair of electrodes formed on the capacitance element, and the other end is a third terminal.   The electronic component with a lead according to claim 2, wherein the second lead is blown at a lower current value than the first lead.   The said 2nd lead wire has one end as a 3rd terminal and the other end as a 4th terminal, and has at least one coil part between the said 3rd terminal and the said 4th terminal. Electronic parts with lead wires.   The electronic component with a lead according to any one of claims 1 to 4, wherein the first lead is configured by combining a plurality of wirings.   The electronic component with a lead according to any one of claims 1 to 4, wherein the coil portion of the first lead is a planar coil.   4. The lead according to claim 1, wherein the second lead has at least a wiring width wider at the other end than at one end connected to the capacitance element side. 5. Electronic components with wires. The second lead wire is a plurality of wires,
4. The lead wire according to claim 1, wherein each of the second lead wires has one end connected to the other of a pair of electrodes formed on the capacitance element. 5. Electronic components.