JPH06163300A - Structure of connecting terminals of electrical component - Google Patents

Abstract

PURPOSE:To easily control laser radiation by easily positioning an electrical component with terminals and an electrode plate in laser-welding them and to ensure welding by melting out a melted welding chip on the whole surface of a terminal. CONSTITUTION:An electrical component 20 with terminals 21 is assembled on an electrode plate 30 with rising welding chips 34 formed so that the terminals 21 come into contact with the welding chips 34. The terminals 21 of the electrical component 20 and the electrode plate 30 are connected by attaching the welding chip 34 melted by irradiating the whole surface of the terminals 21 with a laser beam 2. The tip of the welding chip 30 is folded above the terminals 21 of the electrical component 20.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement in a connection structure between a terminal of a component or element in an electric or electronic component or the like and an electrode plate.

[0002]

2. Description of the Related Art Conventional small electric or electronic parts,
For example, in a small inductor or the like, both ends of the coil are extended to form connection terminals, and these connection terminals may be soldered to a connection piece formed upright on an electrode plate at a relatively low temperature (180 ° C to 300 ° C). I am trying to connect by the attachment method. On the other hand, these small electric and electronic components are generally used by being surface-mounted on a printed circuit board as a part of a circuit component, and after being assembled on the printed circuit board by an automatic machine, for example, reflow soldering is performed. Connection with a printed circuit board is performed by an automatic soldering method such as a soldering method or a dip soldering method.

The reflow soldering method is a method in which a solder layer is provided in advance on opposing joint surfaces and the heating electrode is pressed to melt the solder to mount a component on a printed circuit board. Alternatively, since the pressing force can be adjusted, precise soldering can be performed. Further, the dip soldering method is an effective method for mounting a dip type integrated circuit or a component having a terminal to be inserted into a through hole on a printed circuit board. It is performed by immersing the assembled printed circuit board in an automatic solder bath and carrying it.

By the way, in the parts such as the above-mentioned small inductor, the combination of the coil and the electrode plate is made of a resin (compounding resin) mixed with a magnetic material for the purpose of preventing the magnetic noise of the coil and integrating the core. A three-dimensional insert molding is also provided. In this case, the resin temperature is generally 350 ° C. to 360 ° C., and the mold temperature is 200, although it depends on the kind of the resin material and the molding method.
Reaching ℃.

[0005]

As described above, in the prior art, the connection between the terminal of the component such as the coil and the electrode plate is made by soldering at a relatively low temperature. During the automatic soldering process such as the reflow soldering method or the dip soldering method for mounting on the printed circuit board, the solder brazing connecting the terminal and the electrode plate is eluted and the connecting portion between the terminal and the electrode plate is There was a problem of peeling and breaking.

A laser welding method using a YAG laser is known as a connection method excellent in heat resistance instead of the above soldering. This laser welding method is shown in FIG.
As shown in FIG. 1, the laser welding machine irradiates the coil terminal 1 or the electrode plate 3 which is the connected body with the YAG laser 2 in a non-contact state, so that a part 1 a of the coil terminal 1
Is melted, and as shown in FIGS. 11 and 12, the electrode plate 3 and the coil terminal 1 are welded.

Therefore, according to this laser welding method, the high melting point base material is melted and connected without applying any pressing force or the like to the coil terminal 1 or the electrode plate 3 at the time of connection processing. In the insert molding process, the automatic soldering process such as the reflow soldering method or the dip soldering method for mounting on the printed circuit board, there is no problem that the connection part between the terminal and the electrode plate is peeled by heat. Since the base material is not deformed by pressure, it is very suitable as a method for connecting small parts or minute parts.

[0008]

However, in the laser welding method having the above-mentioned characteristics, the coil terminal 1 of the base material or the connecting piece 3a of the electrode plate 3 is directly melted without using a melting member such as solder. Since the connection is performed by connecting the lasers with each other, high precision is required for controlling the irradiation laser or for the component dimensions. Depending on the arrangement conditions of the coil terminal 1 and the electrode plate 3, for example, the part 3b of the connection piece 3a of the electrode plate 3 that is melted by being irradiated with the YAG laser 2 does not go around the circumferential surface of the coil terminal 1. As shown in FIG. 9, it may become spherical due to surface tension, and welding of the coil terminal 1 and the electrode plate 3 may not be successful.

Further, as shown in FIG. 10, when laser welding the coil terminal 1 and the electrode plate 3 in contact with each other,
If the coil terminal 1 and the electrode plate 3 are simultaneously irradiated with the YAG laser 2 and heated and melted, a strong and reliable connection can be made, but it is impossible to simultaneously melt both members. Therefore, welding is performed by melting a part 1a of the coil terminal 1 irradiated with the YAG laser 2 and eluting it onto the electrode plate 3. However, as shown in FIG. 12, the part 1a of the coil terminal 1 is melted. There is a problem that the tip portion 1b of No. 1 becomes thin and the strength is deteriorated.

Therefore, the present invention facilitates positioning of both members and facilitates control of laser irradiation when connecting the terminal of the component and the electrode plate to each other in the electric and electronic components by the laser welding method. At the same time, it is an object of the present invention to provide a terminal connection structure for an electric component in which one member melted is eluted so as to wrap around the peripheral surface of the other member and both members are reliably connected.

[0011]

In a terminal connection structure for an electronic component according to the present invention, which achieves the above-mentioned object, an electric component element having a terminal is welded to the electrode plate on which an electrode plate is formed in which a welding piece rises. The welding piece melted by laser irradiation is fixed to the peripheral surface of the terminal to connect the terminal of the electric component element and the electrode plate. In addition, the welding piece that is formed so as to stand upright on the electrode plate is bent so that its tip is located above the terminal.

[0012]

According to the above-described terminal connecting structure for an electric component according to the present invention, the terminal of the electric component element is assembled in a state of being positioned by the welding piece formed upright on the electrode plate and irradiated with laser. The welded piece thus melted elutes around the terminal and is firmly connected to the electrode plate. Electric and electronic parts made by connecting the terminal of the electric part element and the electrode plate by laser welding are automatic soldering by the insert molding process of the core material, the reflow soldering method or the dip soldering method for mounting on the printed circuit board. Although heated during the process, the connection between the terminal and the welding piece, which are connected at a high melting point by laser welding, does not melt and separate.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Specific embodiments of the present invention will be described below with reference to the drawings. Inductor 10 shown in FIG.
Is a core material formed by connecting the air-core coil 20 and the electrode plate 30 with the connection structure according to the present invention, and the core material is sealed by the outer peripheral core 11 formed of a resin mixed with a magnetic material. I will do it. The outer peripheral core 11 also serves as the structural material of the inductor 10, and, for example,
Based on polyphenylene sulfide (PPS) resin, Ni-Cu-Zn ferrite powder was used in a weight ratio of 1: 9.
It is molded by the resin material kneaded in.

Further, the air-core coil 20 is, for example, 1
The number of windings is 6. using an AIW wire having a diameter of 0.4 mm as a material.
The coil has 5 turns, an inner diameter of 2.6 mm, and a height of 1.85 mm. Further, both end portions of the air-core coil 20 at the beginning of winding are drawn downward and bent sideways in a crank shape, and their coatings are peeled off to form terminal portions 21 and 21, respectively. .

The electrode plate 30 is formed, for example, by continuously stamping a material plate made of Sn-plated phosphor bronze plate having a plate thickness of 0.5 mm by a press working machine, bending it, and then cutting it. As shown in FIG. 3, a pair of tongue pieces 32, 32 facing each other in the central portion formed by a punched portion 31 having a substantially H-shape are provided with protruding pieces 33, 33 protruding laterally, respectively. These projections 33, 33
The welding pieces 34, 34 rising upward are formed on the.

As shown in FIG. 1, the welding pieces 34, 34 are bent in a substantially V shape so as to face each other with a bending angle of about 70 degrees at an internal angle, and the bent portions 34a, 34a are The facing interval L of 34a is equal to the air core coil 20.
It is set to be slightly smaller than the facing interval between the terminal portions 21, 21. Therefore, the air-core coil 20 has the terminals 21, 21.
Is elastically deformed inward, and the elastic return force of the terminal portions 21 and 21 is folded as shown by the arrow in the figure by incorporating the welding pieces 34 and 34 on the inner surfaces of the bent portions 34a and 34a. It acts on the inner surfaces of the curved portions 34a, 34a, and the terminal portion 2
1, 21 and the welding pieces 34, 34 are temporarily assembled on the electrode plate 30 in a state of being positioned.

As described above, the welding pieces 34, 34 are bent in a substantially V shape so as to face each other, and the free ends thereof are elastically restored to the inner surface sides of the bent portions 34a, 34a. It extends above the terminal portions 21, 21 that are elastically contacted with.

The air-core coil 20 and the electrode plate 30 temporarily assembled as described above are welded by irradiating the welding pieces 34, 34 with the YAG laser 2 by a laser welding machine. The irradiated YAG laser 2 has an irradiation intensity of 275 V, an irradiation time of 20 ms, and a laser spot diameter of 0.
A 6 mm laser is used, and the irradiation surface of the welding pieces 34, 34 is irradiated from a direction perpendicular to the irradiation surface. The irradiation of the YAG laser 2 may be performed on the two welding pieces 34, 34 at the same time.

By the irradiation of the YAG laser 2, the welding piece 3
4 and 34 are melted, and the surfaces of the terminal portions 21 and 21 of the air-core coil 20 in an elastic contact state are also subjected to heat transfer and are melted to a slight depth. As described above, the welding piece 3
Nos. 4 and 34 have their tip portions, which are irradiated with the YAG laser 2, extended above the terminal portions 21 and 21 of the air-core coil 20, so that, as shown in FIG. Welding is performed by the large connection area with the terminal portions 21 and 21 which are eluted so as to wrap around the whole and whose surface is slightly melted. Further, as shown in the figure, since the welded portion is overlaid, sufficient strength is guaranteed.

As described above, the laser spot diameter of the irradiated YAG laser 2 is as small as 0.6 mm, and the welding pieces 34, 34 of the electrode plate 30 and the terminal portions 21, 21 of the air-core coil 20 are formed. It is necessary to accurately irradiate the contact point, but if the air core coil 20 and the electrode plate 30 are combined in a state where they are not positioned, the control thereof is extremely difficult. In the above embodiment, the terminal portion 2
Since the terminal portions 21 and 21 and the welding pieces 34 and 34 are positioned and assembled by the elastic restoring force of 1 and 21, the YAG laser 2 can be accurately irradiated to a predetermined position.

FIG. 5 shows a second embodiment of the connection structure according to the present invention. The same parts as those in the first embodiment are designated by the same reference numerals, and the description thereof will be omitted. In the second embodiment, the welding piece 34 of the electrode plate 30 is erected vertically,
Unlike the first embodiment, it is not bent so as to extend above the terminal portion 21 of the coil 20.

Therefore, when irradiating the YAG laser 2, the tip end of the welding piece 34 substantially extends above the terminal portion 21 by inclining the entirety to the vertical direction by θ °. , The welding piece 34 melted by this
So as to circulate around the entire peripheral surface of the terminal portion 21 and to be eluted, so that the surface of the terminal portion 21 is slightly melted by being heated through the welding piece 34 and welding is performed with a large connection area. To do.

FIG. 6 shows a third terminal connection structure according to the present invention.
The same parts as those of the first and second embodiments are designated by the same reference numerals, and the description thereof will be omitted. In the first and second embodiments, the terminal portion 21 of the air core coil 20 is
Although the connection terminal portion of the electrode plate 30 for connecting the electrodes is constructed as the welding piece 34, in the third embodiment, the electrode plate 30 is connected.
The connection terminal portion 35 is formed independently of the welding piece 34. That is, the connection terminal portion 35 is formed by being bent into an L-shape so that the elastic restoring force of the terminal portion 21 acts on the inner surface of the rising portion, whereby the terminal portion 21 and the connection terminal portion 35. The air-core coil 20 is configured to be temporarily assembled on the electrode plate 30 in a state where and are positioned.

On the other hand, the welding piece 34, which is integrated with the electrode plate 30 or is assembled to the electrode plate 30 by a separate member, covers the free end of the welding piece 34 above the terminal portion 21 which elastically contacts the connection terminal portion 35 in a positioned state. It extends so as to cover it.
Therefore, by irradiating the welding piece 34 with the YAG laser 2, the welding piece 34 melted is converted into the welding piece 34.
By being heated through, the surface is slightly melted and the metal is eluted so as to go around to the terminal portion 21 and the connection terminal portion 35, and the terminal portion 21 and the connection terminal portion 35 are welded by a large connection area. Further, with this configuration, the basic shapes of the terminal portion 21 and the connection terminal portion 35 do not change, so that the strength is sufficiently guaranteed. Further, more appropriate welding can be performed by appropriately selecting the material of the welding piece 34 formed of another member.

FIG. 7 shows a fourth terminal connection structure according to the present invention.
The same parts as those of the above-mentioned embodiments are designated by the same reference numerals, and the description thereof will be omitted. In the fourth embodiment, a connecting terminal portion 36 having a bifurcated tip from the electrode plate 30 is formed to rise, and the connecting terminal portion 36 is engaged with the terminal portion 21 of the air-core coil 20. After that, the connection terminal portion 36 and the terminal portion 21 are caulked by bending the tip portion along the peripheral surface of the terminal portion 21.

In the fourth embodiment thus constituted, the connection terminal portion 36 and the terminal portion 21 are more reliably positioned, and the connection terminal portion 36 is melted by irradiating the YAG laser 2. The welding piece 36 is the welding piece 36.
The surface of the terminal portion 21 is slightly melted by being heated via the ellipse and is eluted so as to wrap around the entire peripheral surface of the terminal portion 21, and the terminal portion 21 and the connection terminal portion 36 are reliably welded by a larger connection area. It

FIG. 8 shows a fifth terminal connection structure according to the present invention.
The same parts as those of the above-mentioned embodiments are designated by the same reference numerals, and the description thereof will be omitted. In the fifth embodiment, the free end portion of the welding piece 37 formed so as to rise from the electrode plate 30 is bent outward in a substantially V shape. In addition, the bent portion 37
The facing distance M between a and 37a is slightly larger than the facing distance between the terminal portions 21 and 21 of the air-core coil 20. Therefore, the air-core coil 20 includes the bent portions 3 of the welding pieces 37, 37 in a state in which the terminal portions 21, 21 are elastically deformed outward.
By incorporating the inner surface of 7a, 37a, the terminal portion 2
The elastic restoring forces of 1 and 21 act on the inner surfaces of the bent portions 37a and 37a as shown by the arrows in the figure, and the electrode plates 30 are positioned with the terminal portions 21 and 21 and the welding pieces 37 and 37 positioned.
Temporarily assembled on top.

Thereafter, the welding pieces 37, 37 are irradiated with the YAG laser 2 to melt the welding pieces 37.
However, by being heated via the welding piece 37, the surface thereof is slightly melted and is eluted so as to wrap around the entire peripheral surface of the terminal portion 21, and the terminal portion 21 and the connection terminal portion 37 have a large connection area. , Surely welded.

The air-core coil 20 and the electrode plate 30 which constitute the core material by being connected by the terminal connection structure of each of the above-mentioned embodiments are the outer peripheral core formed by the resin mixed with the magnetic material by the insert molding process. It is sealed by 11 and completed as the inductor 10 shown in FIG. Since the air-core coil 20 and the electrode plate 30 are connected by the high melting point laser welding method, there is no inconvenience that the connection portion is melted and disconnection occurs even in the insert molding step. Similarly, even if the inductor 10 is mounted on a printed circuit board and subjected to an automatic soldering process such as a reflow soldering method or a dip soldering method, the connection portion between the air-core coil 20 and the electrode plate 30 is melted and broken. There is no such thing.

In each of the embodiments described above, the connection structure of the terminal portion between the air-core coil 20 serving as the core material of the inductor 10 and the electrode plate 30 has been described, but the present invention is applicable to other electric and electronic parts and elements. Of course, it is widely applied to the connecting portion.

[0031]

As described in detail above, according to the present invention, an electric component element having a terminal is arranged so that the terminal comes into contact with the welding piece on an electrode plate on which the welding piece is formed to rise. Since the welding piece melted by being irradiated with a laser is fixed to the entire peripheral surface of the terminal, the terminal and the electrode plate of the positioned electronic component are welded. It is possible to accurately irradiate a laser with a small spot diameter on one side, and it is not necessary to control the irradiating laser or to have high precision in component dimensions.

Further, since the welding piece melted by the laser irradiation is fixed on the entire peripheral surface of the terminal, the terminal of the electric component element and the electrode plate are firmly connected with a wide connection area. Further, the electric and electronic parts obtained by connecting the terminal of the electric part element and the electrode plate by laser welding are manufactured by the insert molding process of the core material, the reflow soldering method or the dip soldering method for mounting on the printed board. In the automatic soldering process, it is possible to reliably prevent the inconvenience of melting and peeling off the connection portion between the terminal and the welding piece, which are connected at a high melting point by laser welding.

[Brief description of drawings]

FIG. 1 is a partially cutaway front view for explaining a temporarily assembled state of an air core coil and a electrode plate that constitute a core material of an inductor that employs a terminal connection structure according to the present invention.

FIG. 2 is a partially cutaway front view of an inductor including the core material.

FIG. 3 is a plan view of a main part of an electrode plate included in the inductor.

FIG. 4 is a vertical cross-sectional view illustrating a connection structure between a terminal portion of the air-core coil and a welding piece formed on an electrode plate.

FIG. 5 is a partially cutaway front view showing a connection structure between a terminal portion of an air-core coil and a welding piece formed on an electrode plate, which is shown as a second embodiment of the terminal connection structure according to the present invention. .

FIG. 6 is a partially cutaway front view showing a connection structure between a terminal portion of an air-core coil and a welding piece formed on an electrode plate, which is shown as a third embodiment of the terminal connection structure according to the present invention. .

FIG. 7 is a partially cutaway front view illustrating a connection structure between a terminal portion of an air-core coil and a welding piece formed on an electrode plate shown as a fourth embodiment of the terminal connection structure according to the present invention. .

FIG. 8 is a partially cutaway front view for explaining a connection structure between a terminal portion of an air-core coil and a welding piece formed on an electrode plate, which is shown as a fifth embodiment of the terminal connection structure according to the present invention. .

FIG. 9 is a longitudinal sectional view of a main part for explaining a connection structure between a terminal portion of a conventional air-core coil and a welding piece formed on an electrode plate, showing a state after welding.

FIG. 10 is a longitudinal sectional view of an essential part for explaining a connection structure of a terminal portion of a conventional air-core coil and a welding piece formed on an electrode plate,
The state before welding is shown.

FIG. 11 is a plan view of relevant parts for explaining a connection structure between a terminal portion of a conventional air-core coil and a welding piece formed on an electrode plate, showing a state after welding.

FIG. 12 is a longitudinal sectional view of an essential part for explaining a connection structure of a terminal portion of a conventional air-core coil and a welding piece formed on an electrode plate,
The state after welding is shown.

[Explanation of symbols]

 2 ... YAG laser 10 ... Inductor 11 ... Outer core 20 ... Air core coil 21 ... Terminal part 30 ... Electrode plate 34 ... Welding piece

Claims (2)

[Claims] 1. An electric component element having a terminal is assembled on an electrode plate on which a welding piece rises so that the terminal comes into contact with the welding piece, and the welding piece melted by laser irradiation is A terminal connection structure for an electric component, in which a terminal of an electric component element and an electrode plate are connected by being fixed to the peripheral surface of the terminal. 2. The terminal connecting structure for an electric component according to claim 1, wherein the welding piece formed upright on the electrode plate is bent so that its tip is located above the terminal.