JP3563201B2 - Electronic components - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a so-called leadless electronic component in which a mounting insulating plate is attached to an end surface of the electronic component in order to facilitate attachment of a lead wire type electronic component to a printed circuit board.
[0002]
[Prior art and its problems]
As a conventional leadless electronic component of this type, there is an electrolytic capacitor as disclosed in, for example, JP-A-59-212213.
In this leadless aluminum electrolytic capacitor, as shown in FIG. 2, a capacitor element 1 is housed in a metal case 2, and leads 3, 3 extending from the capacitor element 1 are pulled out through a sealing member 4 that seals an open end of the case 2. And the through holes 6, 6 which are in contact with the end faces of the capacitor body 5 from which the leads 3, 3 are drawn out and through which the leads 3, 3 penetrate, and the through holes 6, 6 provided on the outer surface. Insulating mounting plate 8 having connected concave grooves 7, 7, and the ends of leads 3, 3 penetrating through holes 6, 6 remain round rods or are subjected to flattening to form grooves 7, 7. The bent portion is to be soldered to the printed circuit board.
[0003]
However, in this capacitor, only the outer portions of the peripheral surfaces of the leads 3, 3 bent and housed in the concave grooves 7, become soldering surfaces to the substrate, so that the soldering area is reduced, and the capacitor is printed. In the process of surface mounting on a board, it is difficult to position the capacitor with respect to the printed board. Further, since the contact area between the capacitor and the conductor of the printed circuit board is small, the amount of molten solder adhering to each other is small, and thus it is not possible to obtain sufficient adhesive strength. In addition, when the leads 3 and 3 are bent, stress is easily applied to the internal capacitor element 1 to easily degrade the characteristics. In order to reduce the stress, cuts are made in the portions where the leads 3 and 3 are to be bent. Although it is also made easy to bend, when a shock or vibration is applied to the capacitor mounted on the printed circuit board, the lead may be broken at the bent portion.
[0004]
Further, such a capacitor has a problem that a lead must be inserted through a small-diameter through hole when the mounting plate is coupled to the capacitor element. This insertion work is extremely inefficient if performed manually, and if automation is to be performed, very high precision is required for the relationship between the capacitor element and the mounting plate. In particular, when the leads are thin wires, two wires are required. The handling is difficult because the leads are not necessarily parallel. Therefore, when such work is automated, no matter how sophisticated the device is, the leads are not inserted into the through holes but are compressed into a flat mass between the end face of the capacitor body and the mounting plate. Such may be sent out as a finished product. In the mass production process, if even one such defective product is found, all of the products of the lot are discarded, and the damage caused by this is extremely large.
[0005]
In order to solve the above-mentioned problem of the electrolytic capacitor with a mounting plate, it is conceivable to provide slits 9 in the mounting plate 8 instead of the through holes 6 as shown in FIG. In the same figure, metal plate terminals 10 and 10 are joined to the outer surface of the mounting plate 8 by insert molding, and slits parallel to each other from one side 8a of the mounting plate 8 toward the metal plate terminals 10 and 10. 9 and 9 are provided. The lengths of the leads 3, 3 of the capacitor body 5 are substantially equal to the thickness of the mounting plate 8, and the distance between them is substantially equal to the distance between the slits 9, 9.
[0006]
When connecting the mounting plate 8 and the capacitor body 5, the leads 3, 3 are introduced into the slits 9, 9 from the mounting plate side edge 8a, and the positions of the mounting plate 8 and the capacitor body 5 are set in a predetermined relationship. The leads 3 and 3 are laser-welded to the metal plate terminals 10 and 10, respectively.
[0007]
The capacitor shown in FIG. 3 is easy to produce because it is not necessary to insert a lead into a small-diameter through-hole, and it is not necessary to bend the lead, so that adverse effects on the capacitor element and disconnection of the lead can be avoided. . In addition, since a metal plate terminal having a large area exists, soldering to a printed circuit board conductor is easy. However, when the lead is introduced along the slit and the lead is pressed against the innermost part of the slit for welding, excessive force is applied to the lead, causing the lead to bend or adversely affect the capacitor characteristics. May give. Therefore, an object of the present invention is to prevent such an excessive force from being applied to the lead.
[0008]
[Means for Solving the Problems]
The electronic component according to the present invention has a cylindrical shape, similar to the capacitor shown in FIG. 3, and has an annular concave groove formed on a peripheral surface thereof, and a plurality of leads are drawn out from the same end surface; A slit is formed at an interval substantially equal to the distance between the leads from one side edge of the electronic component body, and a metal plate terminal corresponding to each slit is provided on an outer surface thereof. Each of the leads passing through the slit is formed of an insulating mounting plate connected to each of the metal plate terminals. Each of the metal plate terminals is disposed between the respective lead position and a side edge different from a side edge of the mounting plate where the slits are opened, and is integrated with an insulator forming the mounting plate by insert molding. Have been.
[0009]
As a feature of the present invention, a stopper having a projection engaging with the concave groove at a tip of at least a part of a half of the mounting plate opposite to the side edge where the slit is opened is provided around the periphery of the electronic component body. It stands along the surface.
And it is preferable that return detent pawls stand substantially along the peripheral surface of the electronic component body from both ends of the half of the side edge side where the slit of the mounting plate opens.
Further, it is more preferable that the detent claw has a projection at its tip for engaging with the concave groove.
[0010]
According to the stopper having the convex portion, when the lead is introduced into the slit to couple the electronic component body and the mounting plate to each other, and the lead is pressed against the innermost portion of the slit for welding, the electronic component is The peripheral surface of the main body abuts against the inner side surface of the stopper, and the convex portion engages with the concave groove of the electronic component main body, so that the movement of the electronic component main body in the direction toward the back of the slit can be stopped. Thereby, when the lead comes into contact with the innermost portion of the slit, it is possible to prevent an excessive force from being applied to the lead, prevent bending of the lead, and prevent adverse effects on the capacitor characteristics. . Further, according to the stopper having the convex portion, the capacitor main body is prevented from coming off from the mounting plate due to shock or vibration, and the electronic component main body is prevented from being displaced along the inner surface of the mounting plate, and the positions of the two are determined. The relationship can be reliably maintained, so that the lead and the metal plate terminal can be reliably welded. In addition, the provision of the return pawl can prevent the electronic component body from shifting along the slit in a direction away from the innermost part thereof, thereby effectively preventing poor connection between the lead and the metal plate terminal. Can be eliminated. In addition, by providing the convex portion which engages with the concave groove of the electronic component main body on the detent claw, the electronic component main body can be further hardly detached from the mounting plate.
[0011]
BEST MODE FOR CARRYING OUT THE INVENTION
In FIG. 1, a mounting plate 8 made of an insulating material is in contact with an end face of the capacitor body 5. Metal plate terminals 10 and 10 are joined to the outer side surface, that is, the lower surface of the mounting plate 8 from the opposing side edges 8b and 8c toward the center, respectively, and from the other side edge 8a to the metal plate terminals 10 and 10, respectively. The slits 9, 9 are formed parallel to each other. From the end face of the capacitor body 5, leads 3, 3 substantially equal to the thickness of the mounting plate 8 are led out at intervals equal to the interval between the slits 9, 9, and these leads 3, 3 are located at the ends of the slits 9, 9, respectively. The inner portion is laser-welded to the metal plate terminals 10 and 10.
[0012]
The capacitor body 5 has a metal case 2 as shown in FIG. 1 (c), and the open end thereof is sealed by a sealing member 4, and the sealing member 4 further has an annular winding groove 13 formed in the metal case 2. Has been tightened by. Stoppers 14, 14 stand upright along the peripheral surface of the capacitor body 5 from the half opposite to the side edge 8 a where the slits 9, 9 of the mounting plate 8 open, and each stopper 14, 14 engages with the winding groove 13. Convex portions 15 and 15 are provided at the tips.
[0013]
From both ends near the side edges 8b and 8c on the side of the side edge 8a where the slits 9 and 9 of the mounting plate 8 are opened, return detent claws 16 and 16 stand substantially along the peripheral surface of the capacitor body 5, Each of the detent claws 16 has a projection 17 at the tip thereof for engaging with the winding groove 13.
[0014]
Each of the stoppers 14, 14 provided with the convex portions 15, 15 introduces the leads 3, 3 from the openings in the side edges 8a of the slits 9, 9 in order to couple the mounting plate 8 to the capacitor body 5. Then, when slid to the innermost portion, each of the protrusions 15, 15 is engaged with the winding groove 13, and the inner surface of each of the stoppers 14, 14 is formed into a shape that abuts on the outer peripheral surface of the capacitor body 5. By this engagement and contact, the movement of the capacitor body 5 can be stopped at that position. Then, while the capacitor body 5 abuts on the stoppers 14, 14, the leads 3, 3 abut on the corresponding metal plate terminals 10, 10 in a state of being engaged with the projections 15, 15.
[0015]
When the leads 3, 3 are introduced from the openings of the slits 9, 9 in order to couple the mounting plate 8 to the capacitor body 5, the detent claws 16, 16 are moved outward by the outer peripheral surface of the capacitor body 5. It is slightly expanded and elastically deformed, and the detent pawls 16, 16 return to the original state with the capacitor body 5 in contact with the stoppers 14, 14, and the inner surface thereof contacts the outer peripheral surface of the capacitor body 5. At the same time, the protrusions 17, 17 provided on the return pawls 16, 16 are engaged with the winding grooves 13.
[0016]
Thus, the leads 3 and 3 are introduced into the slits 9 and 9 to couple the capacitor body 5 and the mounting plate 8 to each other, and the leads 3 and 3 are welded to the innermost portion of the slits 9 and 9 for welding. When pressed, the outer peripheral surface of the capacitor body 5 contacts the inner surfaces of the stoppers 14, 14, and the protrusions 15, 15 provided on the stoppers 14, 14 are engaged with the winding grooves 13 of the capacitor body 5. In addition, the movement of the capacitor body 5 in the direction toward the depth of the slits 9 can be stopped. Thereby, when the leads 3, 3 come into contact with the innermost portions of the slits 9, 9, it is prevented that an excessive force is applied to the leads 3, 3, and the leads 3, 3 are prevented from bending. As a result, it is possible to prevent the characteristics of the capacitor element 1 from deteriorating.
[0017]
Then, as described above, the outer peripheral surface of the capacitor body 5 is brought into contact with the inner surfaces of the stoppers 14, 14 and the return claws 16, 16 with the leads 3, 3 being introduced into the innermost portions of the slits 9, 9. The contact and the engagement of the projections 15, 15, 17, and 17 with the winding grooves 13 cause the capacitor body 5 to shift in all directions along the inner surface of the mounting plate 8. Can be prevented. Further, since the convex portions 15, 15 of the stoppers 14, 14 and the convex portions 17, 17 of the return pawls 16, 16 are engaged with the winding grooves 13, the capacitor body 5 is also prevented from being detached from the mounting plate 8. can do. Therefore, even if shock or vibration occurs, the positions of the capacitor body 5 and the mounting plate 8 are reliably maintained in a predetermined relationship, and the state in which the leads 3, 3 and the metal plate terminals 10, 10 are in contact with each other is maintained. Therefore, the leads 3, 3 and the metal plate terminals 10, 10 can be reliably laser-welded.
[0018]
In the embodiment shown in FIG. 1, two stoppers 14 are provided, but these may be integrated.
The two detent claws 16 do not necessarily need to be provided with the convex portions 17.
[0019]
In the above-described embodiment, the present invention is applied to a cylindrical aluminum electrolytic capacitor, but the present invention can be applied to other electronic components whose leads are led out from one end surface.
[0020]
【The invention's effect】
As described above, according to the present invention, when a mounting plate is connected to an electronic component in which a plurality of leads are led out from one end to change to a surface mount type, the leads must be inserted through the through holes of the mounting plate. In addition to solving the problem that must be solved, when the lead is brought into contact with the innermost part of the slit to weld the lead to the metal terminal, the peripheral surface of the electronic component body contacts the inner surface of the stopper, The convex portion is engaged with the concave groove of the component main body, so that the movement of the electronic component main body in the direction toward the depth of the slit can be stopped. Thereby, when the lead comes into contact with the innermost portion of the slit, it is possible to prevent an excessive force from being applied to the lead, prevent bending of the lead, and prevent adverse effects on the capacitor characteristics. . Further, when connecting the electronic component body and the mounting plate to each other, the capacitor body is held so as not to come off from the mounting plate due to shock or vibration, and the electronic component body is not displaced along the inner surface of the mounting plate. Therefore, the lead and the metal terminal can be reliably welded.
[Brief description of the drawings]
1A and 1B show an embodiment of the present invention, in which FIG. 1A is a plan view, FIG. 1B is a bottom view, and FIG. 1C is a cross-sectional view taken along line AA in FIG.
FIGS. 2A and 2B show an example of a conventional surface mount electronic component, wherein FIG. 2A is a partially cutaway front view, and FIG. 2B is a bottom view.
3A and 3B show an example of an improved surface mount electronic component not according to the present invention, wherein FIG. 3A is a partially cut front view, and FIG. 3B is a bottom view.
[Explanation of symbols]
3 Lead 5 Electronic component body 8 Mounting plate 8a Side edge 8b Side edge 8c Side edge 8d Side edge 8e Side edge 9 Slit 10 Metal plate terminal 13 Winding groove 14 Stopper 15 Convex part 16 Return detent

Claims (3)

An electronic component main body having a cylindrical shape, an annular concave groove formed in a peripheral surface thereof, and a plurality of leads drawn out from the same end surface; Slits are formed at intervals substantially equal to the distance between the leads, metal plate terminals corresponding to the slits are provided on the outer surface thereof, and the leads passing through the slits are respectively connected to the metal plate terminals. It consists of a mounting plate made of insulating material,
A stopper having a protrusion engaging with the concave groove at a tip of at least a part of a half of the mounting plate opposite to the side edge is provided upright along the peripheral surface of the electronic component body. And electronic components. 2. The electronic component according to claim 1, wherein return detent claws are erected substantially along the peripheral surface of the electronic component body from both ends of the half of the mounting plate on the side edge side. 3. 3. The electronic component according to claim 2, wherein the detent claw has a protrusion at a tip end that engages with the concave groove. 4.

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