JPS6018841Y2 - composite capacitor - Google Patents

Description

[Detailed description of the invention] The present invention relates to a composite capacitor that integrates a solid electrolytic capacitor and a capacitor with good high frequency characteristics.

In general, solid electrolytic capacitors are made by press-molding metal powder, such as tantalum, into a cylindrical shape and sintering it to form a capacitor element.A metal wire having a valve action is installed in advance as an anode lead in a capacitor element. A first external lead member is welded to the protruding portion of the lead, and a second external lead member is welded to the surface of the capacitor element with an oxide layer.
The electrode lead layer is soldered through the semiconductor layer, and then the entire circumferential surface of the capacitor element is covered with a resin material.

By the way, this capacitor has a porous capacitor element, so despite its small size,
It is used in a wide range of fields because it can be expected to have excellent effects such as large capacitance, low leakage current, and stable characteristics over a long period of time.

However, when it is used particularly in a high frequency range, a decrease in capacitance or an increase in impedance due to inductance may occur, which may cause significant problems in applications such as video amplification circuits. .

Therefore, in such applications, solid electrolytic capacitors are connected in parallel with, for example, small-capacity ceramic capacitors with good high-frequency characteristics, but two lead wires must be connected at the same point. This has the disadvantage that workability is significantly impaired.

In view of these points, the present invention provides a composite capacitor that has a simple configuration and can be easily mounted on a circuit device.Examples will be described below.

In FIG. 1, 1 is a solid electrolytic capacitor, for example, a capacitor element 2 which is made of a metal member having a valve action, and an electrode which is made of a metal member having a valve action, and an electrode that is made of a metal member on the circumferential surface of the capacitor element 2 through an oxide layer and a semiconductor layer. It consists of a lead-out layer 3, an anode lead 4 made of a metal member having a valve function and led out from the capacitor element 2, and a lead member 5 welded to the protruding portion of the anode lead 4.

Reference numeral 6 denotes a capacitor with good high frequency characteristics, and a plate-shaped body 7 made of a dielectric material such as barium titanate.
and electrodes 8 and 9 formed on both sides of the plate-shaped body 7 so that most of them face each other.

When the solid electrolytic capacitor 1 is placed on the plate-like body 7 of the capacitor 6, the tip of the lead member 5 bent in a roughly Z-shape and the end 8a of the electrode 8 are connected to the electrode lead layer 3. The electrodes 9 are connected with solder members 10, respectively.

By this soldering, solid electrolytic capacitor 1 and capacitor 6 are connected in parallel as shown in FIG.

Further, the exposed portion of the capacitor element 2 is molded and covered with a resin material 11 such as epoxy resin.

In this way, the solid electrolytic capacitor 1 and the capacitor 6 are integrally combined by placing the solid electrolytic capacitor 1 on the plate-shaped body 7 of the capacitor 6 and soldering them, so that the solid electrolytic capacitor 1 and the capacitor 6 have a wide range from low frequency range to high frequency range. Good characteristics can be expected in the frequency domain.

Moreover, since the end portions 9a of the electrodes 8 and 9 and the end portions 8a of the electrodes 9 and 8 are formed on each surface of the plate-like body 7 of the solid electrolytic capacitor 1, Soldering can be performed on either side, improving assembly workability.

Furthermore, the capacitor 6 can be easily and reliably mounted by placing it on a printed circuit board and performing soldering.

Furthermore, by covering the peripheral surface of the solid electrolytic capacitor 1 with a resin material 11, its moisture resistance can be improved and stable characteristics can be obtained over a long period of time.

FIG. 3 shows another embodiment of the present invention, in which capacitors 6 and 6 are provided on the upper and lower surfaces of the solid electrolytic capacitor 1, respective electrodes 9 and 9 are provided on the electrode extraction layer 3, and a lead member 5 is provided on the upper and lower surfaces of the solid electrolytic capacitor 1.
, 5 are connected to the end 8a of the electrode 8 with a solder member 10.

The space on the outlet side of the anode lead 4 is filled with a resin material 11.

According to this embodiment, the same effect as the above-mentioned embodiment can be obtained, and since the solid electrolytic capacitor 1 is held between the capacitors 6 and 6, the characteristics caused by damage to the oxidized layer and semiconductor layer due to external force can be avoided. Deterioration can be reduced.

Note that the present invention is not limited to the above embodiments in any way,
For example, the capacitor element in a solid electrolytic capacitor is made of plate material,
It can also be made of wire.

Further, the capacitor is not limited to a ceramic capacitor using barium titanate.

Furthermore, in addition to using a lead member to connect the anode lead to the capacitor, it is also possible to directly solder the lead-out portion of the anode lead by subjecting it to a process that allows soldering, such as gold plating.

As described above, according to the present invention, the simple configuration facilitates mounting on a circuit device or the like.

[Brief explanation of drawings]

FIG. 1 is a side sectional view showing one embodiment of the present invention, FIG. 2 is an equivalent circuit diagram, and FIG. 3 is a side sectional view showing another embodiment of the present invention. In the figure, 1 is a solid electrolytic capacitor, 2 is a capacitor element, 3 is an electrode extraction layer, 4 is an anode lead, 6 is a capacitor, 7 is a plate-shaped body, and 8 and 9 are electrodes.

Claims (1)

[Scope of utility model registration request] A capacitor element is constructed of a metal member having a valve action, and an anode lead made of a metal member having a valve action is led out from the capacitor element, and an electrode lead layer is formed on the surface of the capacitor element via an oxide layer and a semiconductor layer. The solid electrolytic capacitor has a solid electrolytic capacitor made of a dielectric material, and a capacitor with good high frequency characteristics in which electrodes are formed on both sides of the plate-shaped body made of a dielectric material. A composite capacitor characterized in that an electrode lead layer and an anode lead of an electrolytic capacitor are connected to respective electrodes of the capacitor so that a solid electrolytic capacitor and a capacitor are connected in parallel.