JP2001068377A - Electronic part - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make it possible to observe the polarity of a part body and support the part body without a rackety state in an exterior resin case with respect to an electronic part made up of the part body stored in the exterior resin case. SOLUTION: A metallic case 11 of a part body 1B is covered with a resin coating 15 from a circumferential face 111 to at least a part of bottom face 112. At the same time, a polarity indicating mark 16 for indicating at least one of polarity of lead terminals is formed at the resin coating on the bottom side so that the polarity indicating mark 16 can be recognizable for eyes from the outside of an exterior resin case 2.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electronic component, and more specifically, a component body having the same direction of leads is held in a rectangular cylindrical resin case so that it can be surface-mounted on a circuit board. It relates to electronic components.

[0002]

2. Description of the Related Art Aluminum electrolytic capacitors are well known as components having the same direction of leads, but when they can be surface-mounted on a circuit board, they can be either vertical or horizontal. Is selected.

Generally, when the height (axial length) of an aluminum electrolytic capacitor is low and relatively small, it is of a vertical type, whereas when it is high and relatively large, it is of a horizontal type. . FIG. 7 which is a perspective view of FIG. 6 and a cross-sectional view thereof show a conventional example of a horizontally mounted electronic component.

In this electronic component A, an aluminum electrolytic capacitor 1 is a component body, and the aluminum electrolytic capacitor 1 is housed in an exterior resin case 2. The aluminum electrolytic capacitor 1 includes a bottomed cylindrical metal case 11 made of aluminum. Although not shown, the metal case 11 contains a capacitor element impregnated with a predetermined electrolytic solution.

[0005] The opening of the metal case 11 is
Airtightly sealed by the rubber sealing body 12
, A pair of lead terminals 13 and 14 are drawn out. In this example, one lead terminal 13 is connected to the anode foil side of the capacitor element and the other lead terminal 14
Is connected to the cathode foil side of the capacitor element.

The exterior resin case 2 is formed of a square tube made of a heat-resistant synthetic resin, and has a holding hole 21 formed therein for receiving and holding the aluminum electrolytic capacitor 1 along the axial direction of the case. Both ends of the holding hole 21 are open, and a stopper wall 22 is provided at one end thereof.

[0007] Therefore, the aluminum electrolytic capacitor 1 is inserted into the holding hole 21 of the exterior resin case 2 from the opposite side of the stopper wall 22. Then, the lead terminals 13 and 14 pulled out from the end of the stopper wall 22 are bent substantially perpendicularly downward along the stopper wall 22, and in this example, their respective distal ends are further separated from the case. It is bent almost at a right angle.

The electronic component A is mounted on a circuit board (not shown) with the side surface of the exterior resin case 2 where the lead terminals 13 and 14 are bent as a bottom surface. , For example, by a reflow soldering method. In this conventional example, a dummy terminal 23 for soldering only is provided on the other end side of the exterior resin case 2 so as to increase the mounting strength to the circuit board.

[0009]

According to the electronic component A, since the aluminum electrolytic capacitor 1, which is a component of the same direction as the lead, is housed and held in the rectangular outer resin case 2, for example, Can be placed on a circuit board by the handling operation described above, and the aluminum electrolytic capacitor 1 can be protected from heat during reflow soldering. However, this conventional technique has the following problems.

First, regarding the polarities of the lead terminals 13 and 14, as shown in FIG. 6, the exterior resin case 2 indicates the polarities of the lead terminals 13 and 14, for example, "+", "-". , And the user relies on the polarity indication mark to mount the electronic component A on the circuit board.

However, no such polarity display is made on the aluminum electrolytic capacitor 1 side. Therefore, even if the polarity is erroneously reversed in the process of placing the aluminum electrolytic capacitor 1 in the exterior resin case 2, it is difficult to visually check the polarity error.

Such a polarity error is often found by an electrical circuit board inspection performed after components are mounted on the circuit board. In such a case, all circuit boards that used components from the lot containing the wrong polarity product must be reexamined. Will be.

Further, a gap is provided between the holding hole 21 and the metal case 11 in consideration of workability when inserting the aluminum electrolytic capacitor 1 into the exterior resin case 2. Although this gap is small, such a gap may cause the metal case 11 to resonate depending on the frequency of the applied vibration, for example, in the case of a vehicle, and the performance of the aluminum electrolytic capacitor 1 may be deteriorated.

[0014]

SUMMARY OF THE INVENTION The present invention has been made to solve such a problem, and an object of the present invention is to determine whether the polarity of a component main body matches the polarity indication of an exterior resin case. The present invention provides an electronic component which can be visually inspected, and which can hold the component body tightly in the exterior resin case without play.

According to the present invention, an object is to provide a component main body in which a pair of lead terminals is drawn out from a sealing portion side of a bottomed cylindrical metal case in which component elements are housed.
An external resin case having a holding hole for holding the component body along an axial direction thereof, the component body being held in the holding hole; In the electronic component in which the pair of lead terminals protrudes out of the case from one end side of the exterior resin case, and each end side thereof is bent in a predetermined direction, the metal case has at least a bottom surface from a peripheral surface thereof. This is achieved by providing a resin film on a part of the resin film and providing a polarity display mark indicating the polarity of at least one of the lead terminals on the resin film on the bottom surface side so as to be visible from the other end side of the exterior resin case.

Thus, on the metal case side of the component body,
Even after storing the component body in the exterior resin case,
Since the polarity display mark which can be visually observed from the outside is provided, the polarity of the component main body can be easily visually checked before and after mounting on the circuit board.

Further, since a resin film is provided on the peripheral surface of the metal case, a gap between the holding hole of the exterior resin case and the metal case is filled with the resin film, and the metal case is formed. Rattling is prevented.

In the present invention, the resin film provided on the metal case may be a sleeve made of a heat-shrinkable synthetic resin, or may be a resin material previously integrally coated on a metal plate as a material of the metal case. Any of these may be used.

Further, each end of the lead terminal may be bent in a direction away from the outer resin case along a plane including a predetermined side surface (bottom surface) of the outer resin case, or may be formed on the lower surface of the outer resin case. It may be bent so as to sneak along, and any embodiment is included in the present invention.

[0020]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, the present invention will be specifically described with reference to embodiments shown in the drawings, but the present invention is not limited to these embodiments. In this embodiment, components that are the same as or are considered to be the same as those of the conventional example shown in FIGS. 6 and 7 described above are given the same reference numerals.

As shown in the exploded perspective view of FIG.
The electronic component B according to this embodiment includes an aluminum electrolytic capacitor 1B having the same direction of the lead (discrete type) as a component main body, and an exterior resin case 2 that stores and holds the aluminum electrolytic capacitor 1B inside.

FIG. 2 is a perspective view of the aluminum electrolytic capacitor 1B viewed from the opposite side to FIG. 1. Referring to FIG. 2, the aluminum electrolytic capacitor 1B is made of aluminum, similarly to the above-described conventional example. A metal case 11 having a cylindrical shape with a bottom is provided. Although not shown, a capacitor element impregnated with a predetermined electrolytic solution is accommodated in the metal case 11.

The opening of the metal case 11 is a rubber seal 12
And a pair of lead terminals 13 and 14 are drawn out from the capacitor element side through the sealing body 12. Also in this embodiment, one lead terminal 1
3 is connected to the anode foil side of the capacitor element, and the other lead terminal 14 is connected to the cathode foil side of the capacitor element.

According to the present invention, the metal case 11 is provided with the resin film 15. In this case, the resin film 15 is provided from the peripheral surface 111 of the metal case 11 to at least a part of the bottom surface (top surface) 112, and the resin film 15 has a polarity display mark indicating the polarity of at least one of the lead terminals. 16 is printed.

In this embodiment, the resin film 15 uses a sleeve made of a heat-shrinkable synthetic resin tube. The mounting range of the metal case 11 is from the horizontal drawing groove 113 of the metal case 11 to the periphery of the bottom surface 112. It is assumed to be a range up to. A polarity indication mark 16 is printed on the sleeve at the stage of the manufacturing process.

As another embodiment, the resin film 15 may be a resin material integrally coated on a metal plate as a material of the metal case 11 in advance. That is, a metal plate 11 coated with a resin material in advance as the resin film 15 (see, for example, Japanese Patent Publication No. 8-4061) is punched out by a press, and the metal case 11 is formed into a bottomed cylindrical shape by deep drawing. The polarity indication mark 16 may be printed after the metal case 11 is processed, for example.

The polarity indicating mark 16 may be provided at a position corresponding to one or both of the anode-side lead terminal 13 and the cathode-side lead terminal 14. In this embodiment, the polarity indicator mark 16 is provided on the cathode-side lead terminal 14. It is provided at the corresponding position.

It is important for the present invention that the polarity display mark 16 appears on the bottom surface 112 side of the metal case 11 as shown in FIG. The form of the polarity display mark 16 is not particularly limited.

Regardless of whether the above-mentioned sleeve or coating resin material is used as the resin film 15,
The entire bottom surface 112 may be covered with the resin film 15. Note that an explosion-proof valve 114 is formed on the bottom surface 112 of the metal case 11.
14 is an optional component.

The exterior resin case 2 may be the same as that of the conventional example described above. FIG. 1 shows a state in which the exterior resin case 2 is viewed from the opposite side to FIG.
As described above, the exterior resin case 2 is formed of a square cylindrical body made of a heat-resistant synthetic resin, and has a holding hole 2 for accommodating and holding the aluminum electrolytic capacitor 1B therein.
1 are formed along the case axis direction.

Both ends of the holding hole 21 are open, and a stopper wall 22 is provided at one end thereof.
On the upper surface of the exterior resin case 2 on the side of the stopper wall 22, “+” symbols 24 a and “−” symbols 24 b are provided as polarity indications. A dummy terminal 23 for increasing the soldering strength to the circuit board is provided on the bottom surface on the other end side (opposite to the stopper wall 22) of the exterior resin case 2, and this dummy terminal 23 is used in the present invention. Optional component.

FIG. 3 shows the holding holes 21 of the exterior resin case 2.
A state in which the aluminum electrolytic capacitor 1B is inserted therein is shown. As can be seen from this figure, according to the present invention, the metal case 11 seen from the outside of the exterior resin case 2
Since the polarity display mark 16 appears on the bottom surface 112 of the cover, it is possible to easily confirm whether the polarity display mark 16 and the polarity display of the exterior resin case 2 match.

In this embodiment, the polarity indication mark 16
Is the cathode side.
By matching 6 with the "-" symbol 24b on the exterior resin case 2, erroneous insertion can be prevented.

Even if an incorrectly inserted product is missed and mounted on the circuit board, the polarity indication mark 16 on the bottom surface 112 of the metal case 11 is visible from the outside of the case. The erroneously inserted product can be easily determined without using the board inspection device.

Since the metal case 11 is covered with the resin film 15, the aluminum electrolytic capacitor 1B is prevented from rattling in the holding hole 21 of the exterior resin case 2.

In this embodiment, the lead terminals 13 and 14 of the aluminum electrolytic capacitor 1B are pulled out from the stopper wall 22 side of the exterior resin case 2 and are connected to the stopper wall 22 as in the prior art example of FIG. Are bent downward substantially at right angles, and their respective tips are bent substantially at right angles in a direction away from the exterior resin case 2, but as shown in FIG. Each of the end portions 13 and 14 may be bent so as to enter the bottom surface side of the exterior resin case 2.

In short, even in the case of the modified example as shown in FIG. 4, a part of the resin film 15 is pulled out to the bottom surface 112 side of the metal case 11 as shown in FIG. Should be easily visible from outside the exterior resin case 2.

[0038]

As described above, according to the present invention,
In order to enable surface mounting on a circuit board, in an electronic component in which a component body with the same direction of lead terminals is housed in an exterior resin case made of heat-resistant synthetic resin, the metal case of the component body is A resin coating is provided over at least a part of the bottom surface, and a polarity display mark for indicating the polarity of at least one of the lead terminals is provided on the resin film on the bottom surface side so as to be visible from the outside of the external resin case. It is possible to visually inspect whether or not the polarity of the component main body matches with the polarity display, and to hold the component main body tightly in the exterior resin case without play.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view showing an embodiment of an electronic component according to the present invention.

FIG. 2 is a perspective view of the aluminum electrolytic capacitor used in the embodiment.

FIG. 3 is a perspective view of the embodiment.

FIG. 4 is a perspective view showing a modification of the above embodiment.

FIG. 5 is a side view of the metal case of the modified example as viewed from the bottom side.

FIG. 6 is a perspective view showing a conventional example.

FIG. 7 is a cross-sectional view in which the internal structure of the conventional example is omitted.

[Explanation of symbols]

 B Electronic component 1B Aluminum electrolytic capacitor 11 Metal case 111 Peripheral surface 112 Bottom surface 113 Horizontal drawing groove 12 Rubber sealing body 13, 14 Lead terminal 15 Resin film 16 Polarity indication mark 2 Exterior resin case 21 Holding hole 22 Stopper wall 24a, 24b Polarity indication symbol

Claims (5)

[Claims] 1. A component body in which a pair of lead terminals is drawn out from a sealing portion side of a bottomed cylindrical metal case in which a component element is housed, and a rectangular cylindrical body made of a heat-resistant synthetic resin. An exterior resin case having a holding hole for holding the component main body along an axial direction, wherein the component main body is held in the holding hole, and the pair of lead terminals is connected to one end of the exterior resin case. In an electronic component projecting from the side to the outside of the case, and each end thereof is bent in a predetermined direction, the metal case is provided with a resin film from at least a part of the peripheral surface to the bottom surface, A polarity display mark indicating the polarity of at least one of the lead terminals is provided on the resin film on the bottom side so as to be visible from the other end side of the exterior resin case. Electronic parts according to claim. 2. The electronic component according to claim 1, wherein the resin film is a sleeve made of a heat-shrinkable synthetic resin. 3. The electronic component according to claim 1, wherein the resin film is made of a resin material which is previously integrally coated on a metal plate as a material of the metal case. 4. The electronic component according to claim 1, wherein each end of the lead terminal is bent along a plane including a predetermined side surface of the exterior resin case in a direction away from the case. 5. The electronic component according to claim 1, wherein each end of the lead terminal is bent along a predetermined side surface of the exterior resin case.