JP5832755B2 - Surface mount coil - Google Patents

Description

  The present invention relates to a surface mount coil in which a coil component having windings on the outer periphery of a magnetic core has a structure corresponding to surface mount.

  Conventional surface mount type coils generally have a winding terminal (leader wire) entangled with a tie portion provided on a surface mount terminal and connected by soldering or the like. For example, Patent Document 1 discloses a surface mount coil having a configuration in which a winding terminal is wound around a surface mount terminal.

  FIG. 8 is a perspective view of a first example of a conventional surface mount coil. In the first example of the surface mount type coil disclosed in Patent Document 1, a first winding 86 and a second winding 87 are applied to a core case 84 in which a magnetic core is accommodated. The surface ends of the first winding 86 and the second winding 87 are soldered to the surface mounting terminal 83 attached to the wire.

  Further, Patent Document 2 discloses a surface mount type coil having a structure in which a connection terminal for sandwiching a winding terminal is provided on a surface mounting terminal for soldering and fixing the winding terminal.

  FIG. 9 is a perspective view of a second example of a conventional surface mount coil. In the second example of the surface-mounted coil disclosed in Patent Document 2, the following configuration is proposed. An annular magnetic core provided with a first winding 96 and a second winding 97 is accommodated in the rectangular base 92. The surface mounting terminal 93 has an L-shape, penetrates the inside of the rectangular base 92 from the upper surface to the lower surface, and extends outward along the lower surface of the rectangular base. A sandwiching portion 931 is provided on a portion of the surface mounting terminal 93 exposed on the upper surface of the rectangular base 92. The end portions of the first winding 96 and the second winding 97 are wound and soldered to the holding portion 931.

JP-A-7-78717 Japanese Utility Model Publication No. 5-20416

  In the first example of the conventional surface mount type coil, when the wire diameter of the winding becomes thick, there is a problem that it becomes difficult or impossible to tie the winding terminal to the surface mount terminal. Further, when the winding terminal is soldered without being entangled with the surface mounting terminal, the winding terminal may be peeled off from the surface mounting terminal when an impact or the like is applied.

  On the other hand, in the second example of the conventional surface mount type coil, when the wire diameter of the winding becomes thick, it becomes difficult to sandwich the winding with the sandwiching portion which is a V-shaped groove, and the clamping force is weakened. There was a problem.

  Also, in both examples of surface mount coils, if the winding terminal is routed to perform tangling to the surface mounting terminal, a special forming is required at the winding terminal, and the coil is springbacked. Therefore, there is a problem that stress is applied to the core case or the rectangular base, and warpage and distortion may occur.

  Furthermore, when the winding terminal routing work and the tying work are performed, there is a problem that productivity decreases due to an increase in man-hours due to special forming of the winding terminals and an increase in man-hours due to the tying work.

  In addition, when the wire diameter of the winding is increased, it is necessary to increase the current capacity of the portion where the winding of the surface mount terminal is wound or the sandwiching portion. A surface-mounted terminal with an area is required. Therefore, there has been a problem that the outer dimensions or terminal dimensions of the product are increased and the weight of the product is increased, and accordingly, there is a problem that it is necessary to increase the bonding strength between the surface mount coil and the substrate.

  Therefore, in view of the above points, the present invention eliminates the need for wrapping work of the winding terminal and special forming of the winding terminal even when the wire diameter of the winding becomes thick, and the winding terminal and the surface mount terminal. It is possible to provide a small surface mount coil with a large current capacity that can be easily mounted on the substrate surface and can be firmly mounted on the substrate surface.

  In order to solve the above-described problems, the present invention has been made by examining the shape of a surface-mount terminal in a surface-mount coil.

  That is, according to the present invention, the outer periphery of the annular magnetic core is covered with a core cover made of an insulating layer divided into two regions by a partition wall, and winding is applied to each of the two regions to form an insulating base. A surface-mounted coil that is housed and connected to a surface-mounted terminal disposed on the insulating base and covered with an insulating cover, the surface-mounted terminal comprising a rectangular mounting portion and the rectangular mounting A rectangular current shape comprising a first current path portion standing vertically from two opposite sides of the portion and having a first connection terminal at the tip, and a second current path portion having a second connection terminal at the tip; The shape mounting portion is disposed on the bottom surface of the insulating base, the first connection terminal and the second connection terminal are juxtaposed on the top surface of the insulation base, and the winding terminal is connected to the first connection terminal in the second connection. Surface features characterized by being connected to terminals Type coil can be obtained.

  According to the present invention, the first connection terminal and the second connection terminal each have a first connection terminal protrusion and a second connection terminal protrusion having two protrusions each having a larger interval than the outer diameter of the winding terminal. And the winding terminal is sandwiched between the first connection terminal protrusion and the second connection terminal protrusion.

  According to the present invention, after the winding terminal is sandwiched between the first connection terminal protrusion and the second connection terminal protrusion, the first connection terminal protrusion and the second connection terminal protrusion are wound. The above-described surface-mounting coil is obtained by being bent on the upper surface of the terminal and connected by soldering or welding.

  According to the present invention, the first current path portion is disposed through a through hole provided in the insulating base, and the second current path portion is disposed along a side surface of the insulating base. The above-described surface mount coil can be obtained.

  According to the present invention, the surface mounting is characterized in that an area of the second connection terminal protrusion contacting the winding terminal is larger than an area of the first connection terminal protrusion contacting the winding terminal. A mold coil is obtained.

  According to the present invention, it is possible to obtain the above-described surface-mounted coil characterized in that the slit-shaped groove is provided adjacent to the rectangular mounting portion disposed on the bottom surface of the insulating base.

  Since the surface mount coil of the present invention is connected to the first connection terminal and the second connection terminal of the surface mount terminal without performing special forming on the winding terminal, the productivity is improved and the winding terminal It is possible to suppress warping and distortion of the rectangular base caused by the spring back of the winding material due to special forming.

  Further, since the winding terminal and the first connection terminal and the second connection terminal of the surface mount terminal are connected, the connection strength can be strengthened, and the current path from the winding terminal to the board connection point is 2 By increasing the number of paths, a surface mount coil having a large current capacity can be obtained.

  Furthermore, by providing a slit-shaped groove adjacent to the rectangular mounting part on the bottom surface of the insulating base, a large fillet is formed when soldering to the board, and the bonding strength between the surface mount coil and the board can be improved. become.

Explanatory drawing of the component of the surface mount type coil by the 1st Embodiment of this invention. FIG. 1A is a perspective view of a coil component. FIG. 1B is a perspective view of the insulating base. 1 is a perspective view of a surface mount coil according to a first embodiment of the present invention. The perspective view of the form which covered the surface mount type coil by the embodiment of this invention, and covered the insulating cover. Explanatory drawing of the connection method to the insulation base of the surface mount terminal of the surface mount type coil by the 1st Embodiment of this invention. FIG. 4A is a perspective view of the main part of the insulating base and the surface mounting terminals. FIG.4 (b) is a perspective view of the form by which the surface mount terminal is arrange | positioned at the insulation base. FIG. 4C is a perspective view of a form in which the surface mounting terminals are fixed to the insulating base. The perspective view of the connection state of the coil | winding terminal and surface mount terminal of the 1st Embodiment of this invention. The perspective view which shows the bottom face side of the form which covered the insulating cover of the surface mount type coil by this invention. The perspective view of the surface mount terminal of the 2nd Embodiment of this invention. The perspective view of the 1st example of the conventional surface mount type coil. The perspective view of the 2nd example of the conventional surface mount type coil.

  Hereinafter, embodiments of the present invention will be described in detail. FIG. 1 is an explanatory diagram of components of a surface mount coil according to the first embodiment of the present invention. FIG. 1A is a perspective view of a coil component. The coil component 8 includes a first winding 6 in each of the two regions on the outer periphery of the annular magnetic core covered with the core cover 4 made of an insulating layer such as plastic divided into two regions by the partition wall 5. A second winding 7 is provided. The first winding 6 has a winding terminal 61 at a winding start position and a winding terminal 62 at a winding end position. The second winding 7 has a winding terminal 71 at the winding start position and a winding terminal 72 at the winding end position.

  FIG. 1B is a perspective view of the insulating base. The insulating base 2 has a recess 23 in which the coil component 8 is accommodated at the center, and includes an insulating partition 22 at the center of the recess 23. Surface mount terminals 3 are arranged at the four corners of the insulating base 2. A fitting claw 21 is provided on a side surface of the insulating base 2.

  FIG. 2 is a perspective view of the surface mount coil according to the first embodiment of the present invention. The coil component 8 is accommodated in the insulating base 2, and the winding terminals 61 and 62 of the first winding 6 and the winding terminals 71 and 72 of the second winding 7 are arranged at predetermined positions on the insulating base 2, respectively. The surface mount terminal 3 is connected.

  Here, the insulating partition 22 arranged at the center of the recess 23 of the insulating base 2 described with reference to FIG. 1 is inserted into the partition wall 5 provided in the core cover 4, so that the coil component 8 is insulated from the insulating base 2. 2 is fixed.

  FIG. 3 is a perspective view of a form in which the insulating cover 1 is put on the surface mount coil according to the embodiment of the present invention. The surface mount type coil according to the first embodiment of the present invention is covered with the insulating cover 1 as shown in FIG. 3 after the winding coil component 8 is accommodated in the insulating base 2 as shown in FIG. Here, the insulating cover 1 and the insulating base 2 are fixed by fitting the fitting claw 21 provided on the side surface of the insulating base described in FIG. 1B and the fitting hole 11 provided in the insulating cover 1. Yes.

  Next, the shape of the surface mount terminal will be described in detail. FIG. 4 is an explanatory diagram of a method of connecting the surface mount terminals of the surface mount coil according to the first embodiment of the present invention to the insulating base.

  FIG. 4A is a perspective view of the main part of the insulating base and the surface mount terminals. FIG. 4B is a perspective view of a form in which surface mount terminals are arranged on the insulating base, and FIG. 4C is a perspective view of a form in which surface mount terminals are fixed to the insulating base.

  As shown in FIG. 4A, the surface mounting terminal 3 is a U-shaped structure composed of a rectangular mounting portion 31 and a first current path portion 32 and a second current path portion 34 that are vertically raised from two opposite sides thereof. It has a shape. A first connection terminal 33 is provided at the tip of the first current path portion 32, and a second connection terminal 35 is provided at the tip of the second current path portion 34. Here, the first connection terminal 33 has a configuration in which two first connection terminal projecting portions 331 extending from the first current path portion 32 and having an interval wider than the wire diameter of the winding are arranged in parallel. On the other hand, the second connection terminal 35 has a configuration in which two second connection terminal projecting portions 351 having a gap wider than the wire diameter of the winding are arranged in parallel to the second current path portion 34.

  As shown in FIG. 4A, the insulating base 2 is provided with a through hole 24 penetrating from the top surface to the bottom surface. The first current path portion 32 is inserted into the through hole 24, and the second current path portion 34 is disposed on the side surface of the insulating base 2. The rectangular mounting portion 31 is disposed on the bottom surface of the insulating base 2.

  As shown in FIG. 4B, when the surface mount terminal 3 is arranged on the insulating base 2, the following configuration is obtained. Two first connection terminal protruding portions 331 at the tip of the first current path portion 32 inserted through the through hole 24 of the insulating base 2 are exposed. On the other hand, the second current path portion 34 is disposed on the side surface of the insulating base 2, and two second connection terminal protruding portions 351 extend in the vertical direction from the tip of the second current path portion 34.

  As shown in FIG. 4C, when the surface mount terminal 3 is fixed to the insulating base 2, the following configuration is obtained. By raising the second connection terminal protrusion 351 on the upper surface of the insulating base 2 toward the first connection terminal protrusion 331, the first connection terminal protrusion 331 and the second connection terminal protrusion 351 are arranged in parallel.

  FIG. 5 is a perspective view of the connection state between the winding terminal and the surface mount terminal according to the first embodiment of the present invention. In FIG. 2, the part of the winding terminal 62 at the winding end position of the first winding 6 is shown. The explanation will be expanded. Since the first connection terminal protrusion 331 and the second connection terminal protrusion 351 exposed on the upper surface of the insulating base 2 have a larger interval than the wire diameter of the winding, the winding terminal 62 has the first connection. It is clamped by the terminal protrusion 331 and the second connection terminal protrusion 351. Here, as described with reference to FIG. 4, the second connection terminal protruding portion 351 is provided perpendicular to the second current path portion 34, and is raised to the first connection terminal protruding portion 331 side on the upper surface of the insulating base 2. The area in contact with the winding terminal 62 is wider than the first connection terminal protrusion 331, and the winding terminal 62 can be clamped more firmly.

  The first connection terminal protrusion 331 and the second connection terminal protrusion 351 are firmly connected by sandwiching the winding terminal 62 and then tilting the coil terminal 62 upward and soldering or welding. It is desirable that the winding terminal 62 to be sandwiched and fixed is previously stripped and pre-soldered. Further, it is desirable that the surface mounting terminal 3 is plated.

  FIG. 6 is a perspective view showing the bottom surface side of the surface-mounted coil according to the present invention covered with an insulating cover. As described with reference to FIG. 4B, the surface mounting terminals 3 are inserted from the bottom surface of the insulating base, and the rectangular mounting portions 31 are arranged at the four corners of the bottom surface of the insulating base. A slit-like groove 25 is disposed adjacent to the rectangular mounting portion 31. Due to the presence of the slit-shaped groove 25, a solder fillet is easily formed when the rectangular mounting portion 31 of the surface mounting terminal 3 is soldered to the substrate.

  FIG. 7 is a perspective view of a surface mount coil according to a second embodiment of the present invention. As in FIG. 5, the portion of the winding terminal 62 at the winding end position of the first winding 6 will be described in an enlarged manner. The first connection terminal protrusion 331 is the same as the surface mount coil according to the first embodiment of the present invention shown in FIG. The shape of the second connection terminal protrusion 361 is the same as that of the first connection terminal protrusion 331, unlike the surface mount coil according to the first embodiment of the present invention shown in FIG. The second connection terminal protrusion 361 has a smaller area in contact with the winding terminal 62 than the surface mount type coil according to the first embodiment of the present invention shown in FIG. The connection terminal protruding portion 361 is tilted and firmly connected by soldering or welding. The structure of other portions of the surface mount coil according to the second embodiment of the present invention is the same as that of the surface mount coil according to the first embodiment of the present invention.

DESCRIPTION OF SYMBOLS 1 Insulation cover 11 Fitting hole 2 Insulation base 21 Fitting claw 22 Insulation partition 23 Recess 24 Through hole 25 Slit groove 3, 83, 93 Surface mount terminal 31 Rectangular mounting part 32 1st current path part 33 1st connection Terminal 331 First connection terminal protrusion 34 Second current path part 35 Second connection terminal 351, 361 Second connection terminal protrusion 4 Core cover 5 Partition parts 6, 86, 96 First windings 61, 62, 71, 72 Winding terminals 7, 87, 97 Second winding 8 Coil component 84 Core case 92 Rectangular base 931 Nipping part

Claims (5)

Cover the annular magnetic core with a core cover made of an insulating layer,
Winding the core cover,
It has a surface mount terminal that is housed and placed in an insulating base,
A surface mount type coil in which a winding terminal is connected to the surface mount terminal,
The surface mount terminal is
A rectangular mounting part;
Of the two opposing sides of the rectangular mounting part,
A first current path portion standing upright from one side and having a first connection terminal at the tip;
A second current path portion standing upright from the other side and having a second connection terminal at the tip;
The rectangular mounting portion, the first current path portion, and the second current path portion form a U shape,
Each of the first connection terminal and the second connection terminal has a first connection terminal protrusion and a second connection terminal protrusion having two protrusions each having a gap wider than the outer diameter of the winding terminal,
The second connection terminal has a flat portion that connects two protrusions of the second connection terminal protrusion,
The rectangular mounting portion is disposed on a bottom surface of the insulating base;
The second connection terminal is bent to the side where the first connection terminal is located;
The first connection terminal protrusion and the second connection terminal protrusion are juxtaposed on the upper surface of the insulating base, and the flat portion is placed on the upper surface of the insulating base;
The winding terminal is sandwiched between the first connection terminal protrusion and the second connection terminal protrusion and is connected to the first connection terminal and the second connection terminal by contacting the flat portion. A surface mount coil.   The surface mount type coil according to claim 1, wherein the core cover is divided into two regions by a partition wall, and the winding is applied to each of the two regions. The first current path portion is disposed through a through hole provided in the insulating base, and the second current path portion is disposed along a side surface of the insulating base. or surface mount coil according to claim 2. 4. The surface mount coil according to claim 3 , wherein an area of the second connection terminal protruding portion in contact with the winding terminal is larger than an area of the first connection terminal protruding portion in contact with the winding terminal. . The surface-mounted coil according to any one of claims 1 to 4 , further comprising a slit-shaped groove adjacent to the rectangular mounting portion disposed on the bottom surface of the insulating base.

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