JPS6325728Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field] The present invention relates to electronic components, and particularly to a polarity display mechanism in a resin-molded solid electrolytic capacitor.

[Background technology]

Generally, this type of solid electrolytic capacitor is
As shown in the figure, a metal wire having a valve action is attached in advance to a capacitor element A which is formed by press-forming metal powder having a valve action into a prismatic shape and sintering it, and an anode lead B.
A plate-shaped first external lead member C is welded to this anode lead B, and a plate-shaped second external lead member C is welded to the anode lead B.
Connect the external lead member D to the electrode lead layer E of the capacitor element A using a conductive adhesive,
And the entire circumferential surface of capacitor element A is covered with resin material F.
It is constructed by mold coating.

By the way, in this capacitor, capacitor element A and anode lead B serve as an anode.
Since the electrode lead layer E functions as a cathode, the first and second external lead members C and D connected thereto need to be designated as an anode or a cathode by some method.

Therefore, in the past, as shown in Figure 1,
A notch-like irregularly shaped part G is formed at the upper surface end of the resin material F at the lead-out end of the first external lead member C, or a display symbol is stamped, and the external lead on the side where it is formed is formed. Polarity is indicated by using the member as an anode.

However, as shown in Figure 2, for example, when the capacitor is mounted on a printed board, etc.
If the irregularly shaped part G is reversed so that it is on the lower side, it becomes impossible to recognize the irregularly shaped part G, thereby making it impossible to determine the polarity. For this reason, although it is necessary to reverse the capacitor to its normal posture by some means, there are problems in that the equipment becomes complicated and the operation becomes complicated.

[Disclosure of invention]

Therefore, an object of the present invention is to provide an electronic component that can reliably determine polarity even in an inverted state with a simple configuration.

The feature of this proposal is that the plate-shaped external lead member is led out in a different direction from the component body, and the main part including the component body is molded and covered with a resin material so that a protrusion is formed in the center of the lower surface. In addition, each lead-out end of the external lead member is bent so as to follow the lower surface of the resin material adjacent to the protrusion, and the protrusion is formed into an irregular shape that is asymmetrical in left and right shapes.

According to this invention, since the protruding part on the lower surface of the resin material is formed with an irregularly shaped part whose left and right shapes are asymmetrical, the polarity of the external lead member can be determined by visual inspection even when the electronic component is in an inverted state. can be done easily and reliably.

Further, the irregularly shaped portion of the protruding portion can be formed at the same time as the mold covering of the component body with the resin material, so that no special work process is required for its formation.

[Best form for implementing the idea]

Next, an example of application of the present invention to a solid electrolytic capacitor will be described with reference to FIGS. 3 and 4.

In the figure, 1 is a capacitor element (component body) made by pressure-forming metal powder with valve action into a prismatic shape and sintering it. A functional metal wire is installed as an anode lead 2. Incidentally, the capacitor element 1 can be formed into any suitable shape such as a columnar shape as well as a prismatic shape, and the anode lead 2 can also be welded to the circumferential surface of the capacitor element 1 to lead out. An electrode lead layer 3 is formed on the circumferential surface of the capacitor element 1 via an oxide layer and a semiconductor layer. On the other hand, a plate-shaped first external lead member 4 is welded to the anode lead 2.
A plate-shaped second external lead member 5 is connected to the electrode lead layer 3 using a conductive adhesive 6. The entire circumferential surface of the capacitor element 1 is made of a resin material 7, and a flat protrusion 8 is formed at the center of the lower surface 7a.
The upper surface is coated with a mold so that a deformed portion 9 is formed at the end thereof. In particular, the protruding portion 8 has an irregularly shaped portion 8 a that is asymmetric in left and right shapes, and is formed on the lead-out end side of the first external lead member 4 . Note that this irregularly shaped portion 8a is configured in the shape of a notch. and,
The leading ends of the first and second external lead members 4 and 5 are bent along lower surfaces 7a and 7a adjacent to the protrusion 8 of the resin material 7.

According to this embodiment, since the protruding part 8 on the lower surface 7a of the resin material 7 is configured asymmetrically by the notch-like irregularly shaped part 8a, the protruding part 8 will not protrude even if it is reversed when mounted on a printed board. Based on the shape of the portion 8, the polarity of the external lead member can be easily and reliably determined.

FIG. 5 shows another embodiment of the present invention, in which a protrusion 8 is formed on the lower surface 7a of the resin material 7, and a recess is formed on the lead-out end side of the first external lead member 4. A shaped portion 8b is formed.

According to this embodiment, the polarity can be easily determined due to the left-right asymmetry of the protrusion 8, and
When connecting to a printed board using jet solder,
The irregularly shaped portion 8b can effectively reduce short circuits between the lead-out ends of the first and second external lead members 4 and 5.

6 and 7 show still another embodiment of the present invention, in which a protrusion 8 is formed on the lower surface 7a of the resin material 7, from which the second external lead member 5 is guided. A U-shaped irregularly shaped portion 8c is formed on the end side. The leading end 5a of the second external lead member 5 is fitted into the irregularly shaped portion 8c.

According to this embodiment, the polarity can be easily determined due to the left-right asymmetry of the protrusion 8, and
Even if a part of the capacitor element 1 is exposed from the root portion of the protrusion 8 due to deformation or eccentricity of the anode lead 2, it can be hidden by the lead-out end of the second external lead member 5, and the appearance Deterioration of characteristics can be prevented.

Furthermore, if the lengths of the first and second external lead members 4 and 5 at the resin lower surface 7a are set to be longer, especially on the second external lead member side, the left-right asymmetry of the protruding portion 8 described above can be counteracted. In addition, polarity discrimination can be performed even more easily.

In this case, the electronic components can be applied not only to solid electrolytic capacitors but also to resistors, varistors, semiconductor devices, etc. Further, the irregular shape of the protrusion can be modified as appropriate.

[Brief explanation of the drawing]

FIG. 1 is a side sectional view of the conventional example, FIG. 2 is a bottom view of FIG. 1, FIG. 3 is a side sectional view showing an embodiment of the present invention, FIG. 4 is a bottom view of FIG. The figure is a bottom view showing another embodiment of the present invention, FIG. 6 is a side sectional view showing still another embodiment of the present invention, and FIG. 7 is a bottom view of FIG. 6. In the figure, 1 is the component body (capacitor element),
4 and 5 are external lead members, 7 is a resin material, 7a is a lower surface, 8 is a protruding portion, and 8a, 8b, and 8c are irregularly shaped portions.

Claims (1)

[Scope of utility model registration request] A plate-shaped external lead member is led out in a different direction from the component body, and the main part including the component body is molded and covered with a resin material so that a protrusion is formed in the center of the lower surface, and the external lead member is What is claimed is: 1. An electronic component in which each of the leading ends of the protrusion is bent along the lower surface of a resin material adjacent to the protrusion, and the protrusion is formed into an irregular shape in which the left and right shapes are asymmetrical.