JP2000299250A - Mounting structure of electronic component - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electronic component mounting structure which is capable of preventing an electronic component from being inserted in reverse or erroneously inserted, when a polar electronic part such as an electrolytic capacitor is mounted on a printed board by insertion. SOLUTION: This mounting structure is composed of a guide pin 15, which extends from an electrolytic capacitor 11 in the same direction as with outer terminals 13 and 14 and a guide hole 19 where the guide pin 15 is inserted and which is bored in a printed board 16 together with through-holes 17 and 18, that are provided corresponding to the outer terminals 13 and 14 in accordance with their polarity. The guide pin 15 is inserted into the guide hole 19, and the outer terminals 13 and 14 are each inserted matchingly into the through- holes 17 and 18.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mounting structure for an electronic component, such as an electrolytic capacitor, which has a polarity and is inserted into a printed circuit board.

[0002]

2. Description of the Related Art FIG. 2 shows a conventional mounting structure for an electronic component of this kind. In FIG. 2, reference numeral 21 denotes a cylindrical electrolytic capacitor. 22 is the outer case, 23,
Reference numeral 24 denotes two external terminals led out from the same end surface of the outer case 22 in the same direction. 25 is a printed circuit board; 26 and 27 are external terminals 23 of the electrolytic capacitor 21;
24 are through holes 26 and 27 for insertion.

In FIG. 2, external terminals 23 and 24 of an electrolytic capacitor 21 are inserted and mounted in through holes 26 and 27 of a printed circuit board 25.

[0004]

However, in this type of electrolytic capacitor, aluminum or tantalum is used for an electrode, and an oxide film is formed on this electrode unless a positive voltage is always applied to the electrolyte. When the electrolytic capacitor is mounted on a printed circuit board, care must be taken so that the direction of the electrolytic capacitor is not wrong and mounted in the reverse direction. However, in this type of electrolytic capacitor, a mark or the like indicating one polarity is displayed on the outer case, or the length of the external terminal is changed. Therefore, there is a problem that the electrolytic capacitor may be reversely inserted.

The present invention solves such a conventional problem. In an electronic component mounting structure in which an electronic component having a polarity such as an electrolytic capacitor is inserted and mounted on a printed circuit board, an external terminal of the electronic component is connected to the polarity. To accurately prevent mis-insertion of electronic components.

[0006]

To achieve the above object, an electronic component mounting structure according to claim 1 of the present invention comprises:
The electronic component has a guide pin protruding in the same direction as the external terminal, and the printed circuit board has a guide hole through which the guide pin can be inserted at a position where the terminal insertion portion and the external terminal of the electronic component are aligned according to their polarities. is there.

With the above arrangement, by aligning the guide pins of the electronic component with the guide holes provided on the printed circuit board, the external terminals of the electronic component can be aligned with the terminal insertion portions of the printed circuit board according to their polarities. It is possible to prevent incorrect insertion such as reverse insertion of the external terminal into the terminal insertion portion of the printed circuit board.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to FIG. In FIG. 1, reference numeral 11 denotes a cylindrical electrolytic capacitor, which is connected to an outer case 12 containing a capacitor element, an anode foil and a cathode foil of the capacitor element, and is led out from the same end face 12a of the outer case 12 in the same direction. Two external terminals 13 and 14 and the external terminal 13 of one polarity from the same end face 12a of the outer case.
(Or 14), a non-conductive guide pin 15 protruding in the same direction as the external terminals 13 and 14 is provided.
Reference numeral 16 denotes a printed circuit board, which is a through hole 1 for inserting the external terminals 13 and 14 of the electrolytic capacitor 11.
7 and 18 and a guide hole 19 into which the non-conductive guide pin 15 is inserted. Here, the guide holes 19 are such that the external terminals 13 and 14 of the electrolytic capacitor 11 are aligned with the through holes 17 and 18 of the printed circuit board 16 according to their polarities, so that the guide pins 15 can be inserted. In other words, only when the guide pin 15 is inserted into the guide hole 19, the external terminals 13, 14 are inserted into the through holes 17, 18, and the external terminals 13, 14 are properly arranged.

When mounting the electrolytic capacitor 11 on the printed circuit board 16, the guide pins 15 of the electrolytic capacitor 11 are
The external terminals 13 and 14 are aligned with the through holes 17 and 18, and the guide pins 15 are inserted into the guide holes 19 and the external terminals 13 and 14 are inserted into the through holes 17 and 18. Thereby, each external terminal 13,
14 are properly arranged and inserted into the through holes 17 and 18 so that both poles are matched.

[0010] When the electrolytic capacitor 11 is reversely inserted here, the guide pin 15 of the electrolytic capacitor 11 is displaced from above the guide hole 19 of the printed circuit board 16 and the guide pin 15 cannot be inserted into the guide hole 19. Therefore, the two external terminals 13 and 14 of the electrolytic capacitor 11 cannot be inserted into the through holes 17 and 18 of the printed circuit board 16. That is, reverse insertion of the electrolytic capacitor 11 is prevented.

As described above, according to the above embodiment, each of the external terminals 13 and 14 of the electrolytic capacitor 11 is connected to the guide pin 1.
5 together with each through hole 17, 1
8. Just by inserting the electrolytic capacitor 11 in accordance with the guide hole 19, the electrolytic capacitor 11 can be properly inserted and mounted on the printed circuit board 16 according to the polarities of the external terminals 13 and 14.

In the above embodiment, the case where the electrolytic capacitor is inserted and mounted on the printed circuit board is illustrated. However, the present invention is widely applied to the case where various kinds of electronic components having polarities are inserted and mounted on the printed circuit board. Can be applied.

[0013]

As described above, in the electronic component mounting structure according to the present invention, the electronic component is provided with the guide pins protruding in the same direction as the external terminals, and the printed circuit board has a terminal insertion portion and the external terminals of the electronic components. And a guide hole through which a guide pin can be inserted at a position where the guide pin is inserted in accordance with the polarity of the electronic component. Can be properly inserted into the terminal insertion portion of the printed circuit board in accordance with its polarity, and erroneous insertion, such as reverse insertion of the external terminal of the electronic component into the terminal insertion portion of the printed circuit board, can be reliably prevented.

[Brief description of the drawings]

FIG. 1 is a sectional view showing an electronic component mounting structure according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view showing a conventional electronic component mounting structure.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 11 Electrolytic capacitor 12 Outer case 12a Same end surface of outer case 13, 14 External terminal 15 Guide pin 16 Printed circuit board 17, 18 Through hole 19 Guide hole

Claims (1)

[Claims] 1. A mounting structure of an electronic component having a polarity, wherein external terminals on an anode side and a cathode side, which are led out in the same direction from an outer case thereof, are inserted into a terminal insertion portion of a printed circuit board according to the polarity and mounted. In the electronic component, the electronic component is provided with a guide pin protruding in the same direction as the external terminal, and the printed circuit board is provided with a guide hole through which the guide pin can be inserted at a position where the terminal insertion portion and the external terminal of the electronic component are matched according to their polarities. A mounting structure for an electronic component, comprising: