JPH0794372A - Packaged solid electrolytic capacitor with safety fuse - Google Patents

Abstract

PURPOSE:To provide a fused capacitor by enclosing a capacitor element and a safety fuse in a package with a cap having a transparent or translucent window. CONSTITUTION:A capacitor element 1 with leads 2 and 3 is placed in a recess 5a of a package body 5 made of heat-resisting material such as ceramic and is covered on top with a cap 6 made of heat-resisting material such as ceramic. The cap has a window 7 made of transparent or translucent glass or plastic. The cap 6 and the package body 5, with the capacitor element and a fuse enclosed, are joined integrally using solder glass 8.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention comprises a solid electrolytic capacitor such as a tantalum solid electrolytic capacitor, which is provided with a safety fuse such as an overcurrent fuse or a temperature fuse for a capacitor element in the solid electrolytic capacitor, and these are packaged as a whole. The present invention relates to the structure of a solid electrolytic capacitor.

[0002]

2. Description of the Related Art Conventionally, a package type solid electrolytic capacitor provided with this type of safety fuse is disclosed in Japanese Patent Laid-Open No. 63-840.
As disclosed in Japanese Patent Laid-Open No. 10-105513 and Japanese Patent Application Laid-Open No. 2-105513, a capacitor element is provided between a pair of left and right lead terminals, and an anode rod protruding from a chip piece of the capacitor element is one of the lead terminals on the anode side. On the other hand, the chip piece of the capacitor element and the other cathode side lead terminal are connected by a safety fuse wire, and the entire capacitor element and safety fuse wire are made of epoxy resin or the like. The thermosetting synthetic resin mold part is packaged so that a part of both lead terminals projects from the mold part.

[0003]

However, the thermosetting synthetic resin of the mold portion for packaging the capacitor element or the like is mixed with an appropriate substance in order to improve strength and humidity resistance. Since the safety fuse wire which is opaque and is packaged by the opaque thermosetting synthetic resin mold portion cannot be seen from the outside of the mold portion, the safety fuse wire is a heat load aging in the manufacturing process. At the time of various tests such as tests,
Also, there is a problem that even if the fuse is blown in a state where it is mounted on a printed circuit board or the like, the blowout of the safety fuse wire cannot be distinguished from the external appearance.

Moreover, in the conventional package type solid electrolytic capacitor with a safety fuse, the safety fuse wire is formed by directly enclosing the whole of the capacitor element and the safety fuse wire in the mold part made of thermosetting synthetic resin. When melted due to overcurrent or the like, there is no escape area, so the mold part ruptures, and the molten metal of the safety fuse wire scatters to the surroundings, causing another problem that other parts are damaged.

It is a technical object of the present invention to provide a package type solid electrolytic capacitor with a safety fuse that solves these problems.

[0006]

In order to achieve this technical object, the present invention provides a pair of left and right lead terminals, and an anode rod is disposed between the lead terminals so as to be fixed to one of the lead terminals. In a solid electrolytic capacitor consisting of a capacitor element and a safety fuse wire connecting between the chip piece of this capacitor element and the other lead terminal, a heat-resistant structure in which a storage chamber for the capacitor element is formed in the upper surface on the lower surface side A package member made of an insulating material is also provided on the upper surface side with a lid member made of a heat-resistant insulating material, and the package member and the lid member are bonded together so as to accommodate the capacitor element and the safety fuse wire therebetween. On the other hand, the lid is provided with a transparent or translucent viewing window.

[0007]

[Operation and effect of the invention] With this configuration,
Although the capacitor element and the safety fuse wire are packaged by the package member and the lid with the viewing window, it is possible to see the safety fuse wire inside through the viewing window provided in the lid. Therefore, it is extremely easy to distinguish this safety fuse wire from the appearance when it is blown during a test such as a heat load aging test during the manufacturing process and when it is mounted on a printed circuit board. You can do it.

Since the safety fuse wire is housed in the storage chamber without directly enclosing it in the mold portion made of thermosetting synthetic resin as in the conventional case, it can be melted in the storage chamber. Therefore, when the safety fuse wire is blown by overcurrent or the like, the package member and the lid body do not burst.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of the present invention will be described below with reference to the drawings of FIGS. In the figure, reference numeral 1 indicates a capacitor element, which is composed of a sintered chip piece 1a and an anode rod 1b protruding from the chip piece 1a. , 3 are arranged so as to fix the anode rod 1b of the capacitor element 1 to one of the anode side lead terminals 2, and
A safety fuse wire 4 such as an overcurrent fuse wire or a temperature fuse wire is mounted between the chip piece 1a of the capacitor element 1 and the other cathode side lead terminal 3.

Reference numeral 5 designates a package member made of a heat-resistant insulating material such as ceramic disposed on the lower surface side of the capacitor element 1 and the lead terminals 2 and 3, and reference numeral 6 designates the capacitor element 1 and the lead terminals 2 respectively. , 3 is a cover body made of a heat-resistant insulating material such as ceramics, which is disposed on the lower surface side. A storage chamber 5a for the capacitor element 1 is formed on the upper surface of the package body 5, and grooves 5b, 5c for fitting the lead terminals 2, 3 are formed on the upper surface of the package body 5.

The lid 6 is provided with a transparent or translucent viewing window 7 made of glass or synthetic resin.
Then, the package member 5 and the lid body 6 are aligned so as to accommodate the capacitor element 1 and the safety fuse wire 4 between them, and then the both are treated with an adhesive such as a solder glass 8 inserted between them. The capacitor element 1 and the safety fuse wire 4 are packaged by the package member 5 and the lid 6 by integrally bonding them together.

With this structure, the capacitor element 1 and the safety fuse wire 4 are connected to the package member 5.
And the lid body 6 with the viewing window 7, the safety fuse wire 4 inside can be seen through the viewing window 7 provided in the lid body 6, while the safety fuse wire is Since No. 4 is stored in the storage chamber 5a, it melts in the storage chamber 5a due to overcurrent or the like.

In the manufacture thereof, first, in the package member 5, the capacitor element 1 having one lead terminal 2 fixed to the anode rod 1b is loaded, and the other lead terminal 3 is loaded, and then, In this state, after mounting the safety fuse wire 4 between the chip piece 1a of the capacitor element 1 and the other lead terminal 3, the upper surface thereof is
The lid 6 may be placed with an adhesive such as the solder glass 8 interposed therebetween, and the lid 6 may be attached to the package member 5 with the adhesive such as the solder glass 8.

The projecting portions of the lead terminals 2 and 3 from the package member 5 may be bent as shown by the solid line in FIG. 1 or may be bent as shown by the chain double-dashed line in FIG. Needless to say, the bending process of the lead terminals 2 and 3 may be performed before the package member 5 is loaded, but it may be performed after the package by bonding the package member 5 and the lid body 6 together. You can

[Brief description of drawings]

FIG. 1 is a vertical sectional front view of a solid electrolytic capacitor according to an embodiment of the present invention.

FIG. 2 is a plan view of FIG.

FIG. 3 is a sectional view taken along line III-III in FIG.

FIG. 4 is a sectional view taken along line IV-IV in FIG.

FIG. 5 is a perspective view of an exploded state.

[Explanation of symbols]

 1 Capacitor element 1a Chip piece 1b Anode rod 2,3 Lead terminal 4 Safety fuse wire 5 Package member 5a Storage chamber 6 Lid 7 Peep window 8 Solder glass

Claims (1)

[Claims] 1. A pair of left and right lead terminals, a capacitor element in which an anode rod is fixed between the lead terminals so as to be fixed to one of the lead terminals, a chip piece of the capacitor element and the other lead terminal. In a solid electrolytic capacitor consisting of a safety fuse wire connecting between the two, a package member made of a heat-resistant insulator, in which a storage chamber for the capacitor element is formed on the upper surface, is formed on the lower surface side, and a heat-resistant insulator is also formed on the upper surface side. A lid made of metal, and the package member and the lid are attached to each other so as to accommodate the capacitor element and the safety fuse wire therebetween, while a transparent or translucent viewing window is provided on the lid. A structure of a package type solid electrolytic capacitor with a safety fuse, which is characterized by being provided.