JP4423938B2 - Terminal part structure of surface mount parts - Google Patents

Description

  The present invention relates to a terminal portion structure of a surface mount component such as an inductor, and more particularly, to be completely solderless and to have a connection portion between a lead wire and a terminal member that is compatible with automatic mounting of a surface mount component. The present invention relates to a terminal part structure of a surface mount component that can be used.

  In the terminal structure of surface mount components, lead-free solder is generally used to connect the lead wires and terminal members. When lead-free solder is used, the surface mount component is mounted on the board. The lead-free solder may be remelted during the mounting process. For this reason, from the viewpoint of guaranteeing a surface-mounted component as a product, the terminal portion of the surface-mounted component tends to be required to be completely solderless including the non-use of lead-containing high-temperature solder.

As a prior art of such a solderless terminal part, for example, a terminal part structure of a coil device including the following inductor is known. This conventional terminal portion structure is formed by pressing a single phosphor bronze plate having a thickness of 0.10 to 0.2 mm to form a lead frame including a portion to be a terminal member. The terminal member is bent at a right angle so as to be perpendicular to the surface of the lead frame. And the terminal part structure of coil devices, such as an inductor, is constituted by making a coil terminal part contact the tip part of a terminal member, and connecting a coil terminal and a terminal member by laser welding. (For example, refer to Patent Document 1).
JP-A-5-315176 (pages 2 to 3, FIGS. 1 to 4).

  Since the mounting process on the substrate is generally automated for the surface mounting component, the surface mounting component is often exposed to severe conditions during the automatic mounting. For this reason, the terminal part structure of the surface mount component is required to have a strong mechanical strength.

  However, in the prior art described in Patent Document 1, the end portion of the coil is brought into contact with the tip portion of a terminal member formed by bending a single phosphor bronze plate, and the end of the coil is connected by laser welding. Since it has a structure in which the terminal member is connected, it cannot be said that the mechanical strength is sufficient, and there is a risk of being damaged during automatic mounting.

  Therefore, there is a technical problem to be solved in order to improve reliability by making the connection part between the lead wire and the terminal member robust and compatible with automatic mounting of surface mount parts together with completely solderless. The present invention aims to solve this problem.

The present invention has been proposed in order to achieve the above object, and the invention according to claim 1 is made of a metal plate and includes at least a part of a surface mount component as an inductor, thereby mounting the surface mount component. A terminal member having a fixed portion fixed to the wire, and a wire binding portion formed in a portion of the double plate portion that is brought into contact with the extended portion extending from one end side of the fixed portion,
The fixing part is composed of a U-shaped main body part and a bent part that is bent substantially at right angles from a folding line in which a horizontally long slit is formed on one upper edge side of the U-shaped part,
The end portion of the lead wire drawn out from the surface mount component is entangled with the wire tie portion, and the wire tie portion where the lead wire is tangled is melted by laser welding to connect the lead wire to the terminal member. In the terminal part structure of the surface mount component
The wire binding part is composed of a notch part in which both side parts of the double plate part are notched in a concave shape,
The terminal member is shielded at the fixed portion by fitting the U-shaped portion into the shield ring portion from below and then bending the bent portion substantially at a right angle so as to contact the upper surface of the shield link. When the wire entangled portion that is fixed to the inductor by holding the ring portion and is entangled with the insulated coated wire drawn from the coil of the inductor is melted by laser welding, the insulated coated wire is also melted. And the terminal part structure of the surface mounting component formed by connecting the inner side conducting wire in this insulation coating conducting wire to the said terminal member is provided.

  According to this configuration, by forming the wire binding portion at the portion of the double plate portion, the amount of melting increases when the wire binding portion where the conductor is entangled is melted by laser welding. An amount sufficient to connect to the terminal member is ensured and a reliable connection is made. In addition to this, the bending strength of the extending portion is increased by making the extending portion a double plate. Therefore, the connection portion is robust and compatible with automatic mounting of surface-mounted components. Further, by applying laser welding to the connection of the conductive wire to the terminal member, it becomes possible to produce surface mount components by an automatic machine.

  According to this structure, the conducting wire entangled with the wire tying portion is brought into close contact, and the conducting wire and the terminal member can be efficiently connected by laser welding.

  According to this configuration, it is possible to omit the step of stripping the insulating coating on the insulating coated conductor.

  The invention according to claim 1 is made of a metal plate, and holds at least a part of the surface mounting component, and is fixed to the surface mounting component, and an extension extending from one end side of the fixing portion. A terminal member having a wire binding portion formed at a portion of the double plate portion which is folded back and brought into contact with each other, and a terminal portion of the lead wire drawn out from the surface mount component is used as the wire binding portion. Since the lead wire is connected to the terminal member by melting the wire tie portion where the lead wire is entangled by laser welding, the extension portion is made into a double plate. The amount of melt can be increased during the welding, and a reliable connection can be made. In addition, the bending strength of the extension can be increased. Therefore, reliability can be improved by making the connecting portion between the conductive wire and the terminal member robust so as to be compatible with automatic mounting of surface mount components. In addition, by applying laser welding, it is possible to stably produce surface-mounted components using an automatic machine, which can improve quality and reduce costs, and realize a completely solder-free process. There is an advantage that can be.

This invention, the wire tying portion, so formed by the portion of the notch portion notched at least one side in a concave of the double plate, in addition to the effects mentioned above, the wire tied part There is an advantage that the tangled wires are brought into close contact with each other and the connection between the wires and the terminal member by laser welding can be performed efficiently and more reliably.

This invention, the surface mounted component is an inductor, the ends of the insulation coated conductive wire drawn from the coil of the inductor tied to the wire tied part, the wire fault that the insulating coated conductive wire was tied When the flange is welded by laser welding, the insulation coating of the insulation-coated conductor is also melted, and the inner conductor of the insulation-coated conductor is connected to the terminal member. There is an advantage that the film peeling step can be omitted, the number of manufacturing steps can be reduced, and the cost can be further reduced.

  Surface mount parts such as inductors, which are made of metal plates, aiming to improve reliability by realizing complete solder-less and making the connection part between the lead wire and terminal member rugged for automatic mounting of surface mount parts A fixed portion fixed to the surface mount component by holding at least a part of the fixed portion, and a portion of the double plate portion which is brought into contact with the extended portion extending from one end side of the fixed portion, or Wire tie formed by notching at least one side portion of the double plate portion into a concave portion in a portion of the double plate portion where the two extended portions extending from both ends of the fixed portion are in contact with each other A terminal member having a portion, an end portion of the insulated coated wire drawn out from the surface mount component is entangled with the wire tangled portion, and the wire tangled portion with the insulated coated wire is laid Insulation of the insulated conductor Melted, and the inner conductor in the insulating coated conductive wire was achieved by connecting to said terminal member.

  Embodiment 1 of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a partially sectional side view before laser welding and after laser welding in a terminal part structure of a surface mount component according to the present embodiment, and FIG. 2 is a front view of a terminal member according to the present embodiment. 3 is a side view of FIG. 2, FIG. 4 is a plan view of FIG. 3, and FIG. 5 is a rear view of FIG. In this embodiment, and in Embodiments 2 and 3 to be described later, an inductor is applied as a surface mount component.

  First, the structure of the terminal part structure of the surface mount component according to the present embodiment will be described. As shown in FIG. 1A, the inductor 1 is configured by fitting a ferrite drum core 2 around which a coil (not shown) is wound into a ferrite shield ring 3. And the terminal provided with the fixing | fixed part 5 fixed to the inductor 1 so that the part of this shield ring 3 may be held, and the wire binding part 6 arrange | positioned so that it may be located in the predetermined position of the inductor 1 The member 4 is assembled to the inductor 1.

  As shown in FIGS. 2 to 5, the terminal member 4 is made of a metal plate having a required width, and is a fold in which a horizontally long slit 5 a is formed on one upper edge side of the U-shaped portion that becomes the fixing portion 5. A bent portion 5b that is bent at a substantially right angle from the curved line is formed. The fixed part 5 is composed of the bent part 5b and a U-shaped main body part. Further, an extending portion 7 extending upward is formed on the other upper edge side of the U-shaped portion. The extension portion 7 is a double plate portion as shown in FIG. 3 by folding back and contacting at an appropriate portion. And the both sides of the extension part 7 which consists of this double plate part are notched concavely, and the wire binding part 6 is formed of the part of this notch. Even when only one side portion of the extending portion 7 made of the double plate portion is cut out in a concave shape, the wire binding portion 6 can be formed by the cutout portion.

  The terminal member 4 is configured as described above. As shown in FIG. 1A, after the U-shaped portion is fitted into the shield ring 3 from below, the bent portion 5b is set substantially at a right angle. By bending and contacting the upper surface of the shield ring 3, the portion of the shield ring 3 is held by the fixing portion 5 and the terminal member 4 is fixed to the inductor 1. With the terminal member 4 fixed, the wire binding portion 6 is disposed at a predetermined position of the inductor 1.

  It is necessary to provide two terminal members 4 corresponding to both ends of the coil of the inductor 1. An appropriate insulating sheet or the like is interposed between the fixed portion 5 of at least one of the two terminal members 4 and the shield ring 3.

  Next, the connection process and operation in the terminal part structure of the surface mounting component configured as described above will be described. The end portion of the insulation-coated conductor 8 drawn out from the coil of the inductor 1 is bound to the wire binding portion 6. At this time, since the wire binding portion 6 is formed by a notch portion in which both side portions of the extension portion 7 are notched in a concave shape, the insulative insulated conductor wire 8 is in close contact. Next, when melting by laser welding is performed from the extension portion 7 to the wire binding portion 6 in which the insulation-coated conductor 8 is entangled, as shown in FIG. The coating also melts, and the inner conductor of the insulating coated conductor 8 is connected to the terminal member 4. At this time, since the extending portion 7 and the wire binding portion 6 are formed of a double plate, the amount of melting increases, and the amount becomes sufficient to connect the conductive wire to the terminal member 4 and the wire binding portion. Since the insulated conductor 8 entangled with 6 is in intimate contact, reliable connection is efficiently performed.

  As described above, in the terminal portion structure of the surface mount component according to the present embodiment, the extension amount 7 and the wire binding portion 6 are double plates, so that the amount of melting is increased during laser welding. In addition to this, the bending strength of the extending portion 7 can be increased. Therefore, reliability can be improved by making the connecting portion between the conductive wire and the terminal member 4 robust to cope with the automatic mounting of the inductor 1 which is a surface mounting component. In addition, by applying laser welding, the inductor 1 can be stably produced by an automatic machine, the quality can be improved, the cost can be reduced, and further, the complete solder-less operation can be realized. it can. Furthermore, the step of peeling off the insulating coating on the insulating coated conductor 8 drawn from the coil can be omitted, the number of manufacturing steps can be reduced, and the cost can be further reduced.

Although it is not the Example of this invention itself, it demonstrates using FIG. 6-10 about the technical example 2 closely related to this invention . FIG. 6 is a partial cross-sectional side view of a terminal part structure of a surface mount component according to the present technology example. FIG. 7 is a front view of the terminal member before assembly in the present technology example. FIG. 8 is a side view of FIG. FIG. 9 is a plan view of FIG. 10 is a rear view of FIG.

As shown in FIGS. 7 to 10, in the present technology example, a metal plate having a required width to be the terminal member 9 is formed as follows. That is, a bent portion 10b is formed on one upper edge side of the U-shaped portion serving as the fixed portion 10 and is bent at a substantially right angle from a bent line in which a horizontally long slit 10a is formed. Further, the bent portion 10b One extending portion 11a bent in advance at a right angle from the upper edge portion is formed at the upper edge portion. Both ends of one extending portion 11a are cut out in a concave shape in advance. A fixed portion 10 is constituted by the bent portion 10b and the U-shaped main body portion. The other extending portion 11b extending upward is formed on the other upper edge side of the U-shaped portion. As for the other extending portion 11b, both side portions thereof are notched in a concave shape in advance.

  The metal plate of the required width used as the terminal member 9 is formed as described above. As shown in FIG. 6, after the U-shaped portion is fitted into the shield ring 3 from below, the bent portion is formed. 10b is bent at a substantially right angle and brought into contact with the upper surface of the shield ring 3, so that the portion of the shield ring 3 is held by the fixing portion 10 and the terminal member 9 is fixed to the inductor 1. Further, when the bent portion 10b is bent at a substantially right angle, the one and other extending portions 11a and 11b are in contact with each other, and the extending portions 11 are all double plates. In addition, the wire binding portion 12 having both side portions notched in a concave shape is formed. The wire binding portion 12 is disposed so as to be positioned at a predetermined position of the inductor 1 by fixing the fixing portion 10 to the shield ring 3 portion.

In the terminal part structure of the surface mount component according to the present technology example, since the terminal member 9 is configured as described above, all the parts of the extension part 11 are double plates, and the bending strength of the extension part 11 is increased. Further, the connection portion between the conductor 8 and the terminal member 9 is made more robust to cope with the automatic mounting of the inductor 1 which is a surface mounting component, and the reliability can be further improved. Other operations and effects are substantially the same as those of the first embodiment.

Technical Example 3 of the present invention will be described with reference to FIG. This figure is a front view of the terminal part structure of the surface mount component according to the present technology example. As shown in the figure, in the present technical example, two wire binding portions 13a and 13b are formed close to the extending portion formed by the double plate portion in the first embodiment or the second technical example. Yes. And each terminal part of the two conducting wires 8a and 8b drawn out from the inductor which consists of two winding specifications is respectively entangled with the two wire tying parts 13a and 13b, and each conducting wire from the extension part The two conductors 8a and 8b are connected to the terminal member 14 by being melted by laser welding over the two wire binding portions 13a and 13b in which 8a and 8b are respectively bound.

Since the terminal part structure of the surface mount component according to the present technology example is configured as described above, the terminal part structure is compatible with a low DC resistance type inductor having two winding specifications. Other operations and effects are substantially the same as those of the first embodiment or the second technical example.

  The present invention can be variously modified without departing from the spirit of the present invention, and the present invention naturally extends to the modified ones.

The figure shows an embodiment of the present invention.
(A) is a partial cross-sectional side view before laser welding in the terminal part structure of the surface mount component according to the first embodiment, and (b) is a partial cross-sectional side view after laser welding. The front view of the terminal member before the assembly in Example 1. FIG. The side view of FIG. FIG. 4 is a plan view of FIG. 3. The rear view of FIG. The partial cross section side view of the terminal part structure of the surface mounting component which concerns on Example 2. FIG. The front view of the terminal member before the assembly in Example 2. FIG. The side view of FIG. The top view of FIG. The rear view of FIG. The front view of the terminal part structure of the surface mounting component which concerns on Example 3. FIG.

Explanation of symbols

1 Inductor (Surface mount component)
3 Shield ring (part of surface mount parts)
4, 9, 14 Terminal member 5, 10 Fixed portion 6, 12 Wire binding portion 7, 11 Extension portion 8 Insulation coated conductors 13a, 13b Two adjacent wire binding portions

Claims (1)

A fixed portion fixed to the surface mount component by holding at least a part of the surface mount component that is an inductor made of a metal plate, and an extended portion that extends from one end side of the fixed portion are folded back to form a pair. A terminal member having a wire binding portion formed in the portion of the double plate portion that is in contact;
The fixing part is composed of a U-shaped main body part and a bent part that is bent substantially at right angles from a folding line in which a horizontally long slit is formed on one upper edge side of the U-shaped part,
The end portion of the lead wire drawn out from the surface mount component is entangled with the wire tie portion, and the wire tie portion where the lead wire is tangled is melted by laser welding to connect the lead wire to the terminal member. In the terminal part structure of the surface mount component
The wire binding part is composed of a notch part in which both side parts of the double plate part are notched in a concave shape,
The terminal member is shielded at the fixed portion by fitting the U-shaped portion into the shield ring portion from below and then bending the bent portion substantially at a right angle so as to contact the upper surface of the shield link. When the wire entangled portion that is fixed to the inductor by holding the ring portion and is entangled with the insulated coated wire drawn from the coil of the inductor is melted by laser welding, the insulated coated wire is also melted. A terminal part structure of a surface mount component, wherein the inner conductor of the insulation coated conductor is connected to the terminal member.

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