JP2010093107A - Lateral type coil component - Google Patents

Abstract

[PROBLEMS] To improve the reliability of connection between a terminal and a printed circuit board by making it difficult to place a burden on the connection part between the terminal and the printed circuit board, and to reduce the load applied to the terminal and enable stable mounting. Provided is a horizontal coil component with good accuracy.
Terminal blocks 13A and 13B are positioned above E-type cores 31A and 31B. The insulating cover 40 covers the bobbin 10 from below. The first and second leg portions 46 and 47 extend downward on the outer sides of the outer leg portions 33A and 33B across the upper sides of the outer leg portions 33A and 33B of the E-shaped cores 31A and 31B. The lower end positions of the first and second leg portions 46 and 47 are higher than the lower end positions of the E-type cores 31A and 31B and abut against the printed circuit board 26. The horizontal coil component 100 is mounted by dropping a portion below the lower end position of the first and second leg portions 46 and 47 into the opening 28 of the printed circuit board 26.
[Selection] Figure 1

Description

  The present invention relates to a horizontal coil component used as a choke coil, a transformer (for example, a resonant transformer used for a resonant power supply), or the like.

As choke coils and transformers for power supplies used in thin TVs and the like, horizontal choke coils and transformers that have a bobbin winding direction in the horizontal direction and can be easily reduced in profile are used. Patent Document 1 below relates to a substrate mounting type or substrate dropping type transformer, by making a part of a terminal into a spring shape, or by thinning a part of the terminal so as to have a spring property. It is said that it is possible to improve the grounding property between the terminal and the board when mounting and to realize a transformer free from poor solder conduction.
JP 2001-57310 A

  When the terminal is provided with springiness as in Patent Document 1, even if the grounding property between the terminal and the board is improved, a load is applied to the soldered portion that connects the terminal and the board due to vibration or impact after soldering. Therefore, there is a problem that the connection between the terminal and the substrate is easily broken. In addition, since the entire weight of the transformer is supported by the terminals, there is a problem that the terminals are easily loaded, and the mounting is unstable and the height accuracy is poor.

  The present invention has been made in recognition of such a situation, the purpose of which is to improve the reliability of the connection between the terminal and the printed circuit board by making it difficult to put a burden on the connection portion between the terminal and the printed circuit board, An object of the present invention is to provide a horizontal coil component that reduces the load applied to the terminal, enables stable mounting, and has good height accuracy.

One embodiment of the present invention is a horizontal coil component. This horizontal coil component
A bobbin having a winding drum, a flange formed on each side of the winding drum, a terminal block formed on at least one hook, and a terminal protruding from the terminal block;
A winding that is applied to the winding body of the bobbin, and a terminal is electrically connected to the terminal;
A core that forms a closed magnetic path, with a center leg inserted inside the bobbin and an outer leg surrounding the outside of the bobbin;
An insulating cover interposed between the winding and the core and fitted to the bobbin;
It is a horizontal coil component that is dropped into the opening of the printed circuit board having an opening and is mounted on the printed circuit board.
The terminal block is located above the core;
The terminal is bent downward and inserted into the through hole of the printed circuit board,
The insulating cover is covered with the bobbin from below, and has first and second leg portions that extend downward on the outside of the outer leg portion across the upper side of the outer leg portion of the core, The first leg portion and the second leg portion are opposed to each other with the winding drum portion interposed therebetween, and lower end positions of the first and second leg portions are above a lower end position of the core, and This structure is in contact with the printed circuit board.

  In a horizontal coil component of a certain aspect, the terminal may be an L pin terminal.

  In the horizontal coil component according to an aspect, the insulating cover includes first and second side wall portions that are located between the winding and the outer leg portion of the core and that face each other with the winding body portion interposed therebetween. And the first and second leg portions may be formed to extend from the first and second side wall portions, respectively.

  In one aspect of the horizontal coil component, the core is a combination of a first core made of an E-type core and a second core made of an E-type core or an I-type core, and the center of the E-type core. The leg portion may be inserted inside the bobbin.

  It should be noted that any combination of the above-described constituent elements, and those obtained by converting the expression of the present invention between methods and systems are also effective as aspects of the present invention.

  According to the horizontal coil component of the present invention, the terminal block of the bobbin is located above the core, the terminal protruding from the terminal block is bent downward and inserted into the through hole of the printed circuit board, and the winding and the core And a lower end position of the first and second legs of the insulating cover above the lower end position of the core so as to contact the printed circuit board. Therefore, the weight can be supported by the first and second legs. For this reason, it is hard to put a burden on the connection part of a terminal and a printed circuit board, and the reliability of the connection of a terminal and a printed circuit board can be improved. Also, the load on the terminal is reduced, stable mounting is possible, and the height accuracy is good.

  Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings. In addition, the same code | symbol is attached | subjected to the same or equivalent component, member, etc. which are shown by each drawing, and the overlapping description is abbreviate | omitted suitably. In addition, the embodiments do not limit the invention but are exemplifications, and all features and combinations thereof described in the embodiments are not necessarily essential to the invention.

  FIG. 1 is an explanatory diagram of a horizontal coil component 100 according to an embodiment of the present invention, where (A) is a perspective view seen from above, (B) is a perspective view seen from below, and (C) is a front view. , (D) is a bottom view. Here, in the same figure (B), illustration of the printed circuit board 26 which mounts the horizontal coil component 100 is abbreviate | omitted. FIG. 2 is an exploded perspective view of the horizontal coil component 100.

  The horizontal coil component 100 of the present embodiment is a board dropping type that is dropped into the opening 28 of the printed board 26 having the opening 28 (see FIG. 1D) and mounted on the printed board 26. The mounting direction of the horizontal coil component 100 on the printed circuit board 26 is defined as downward. In the present embodiment, the case where the horizontal coil component 100 is a transformer is illustrated.

  The horizontal coil component 100 includes a bobbin 10, windings 20 </ b> A and 20 </ b> B, a core 30, and an insulating cover 40. The bobbin 10 includes a winding drum portion 11 (shown by dotted lines in FIG. 1A and FIG. 2), flange portions 12A and 12B, terminal blocks 13A and 13B, terminals 14A and 14B, an intermediate flange 15, A core insertion hole 16.

  The flange portions 12A and 12B are formed on both sides of the winding drum portion 11, and the terminal blocks 13A and 13B are formed on the flange portions 12A and 12B, respectively. ) Or iron (surface plated with copper, tin, or the like) terminals 14A and 14B respectively protrude. Here, as shown in FIG. 1, the terminals 14A and 14B protrude from the terminal blocks 13A and 13B, for example, outward in the axial direction of the winding drum 11 and are bent downward, and are inserted into the through holes 27A and 27B of the printed circuit board 26. Is done. Terminals 14A and 14B are preferably L pin terminals. The windings 20A and 20B are applied to the winding drum portion 11 so that the terminals are electrically connected to the terminals 14A and 14B, and the intermediate collar 15 formed at the intermediate portion of the winding drum portion 11 partitions the windings 20A and 20B. ing. A core insertion hole 16 is formed so as to penetrate the inside of the winding drum portion 11 (inside the bobbin 10), and the core insertion hole 16 is located below the terminal blocks 13A and 13B.

  The core 30 is a combination of E-type cores 31A and 31B made of, for example, ferrite. In the E-shaped cores 31A and 31B, the central leg portions 32A and 32B are inserted into the core insertion holes 16 of the bobbin 10, and the outer leg portions 33A and 33B are abutted with each other to surround the outside of the bobbin 10 together with the base portions 34A and 34B. There is a road. In this state, the terminal blocks 13A and 13B of the bobbin 10 are positioned above the E-type cores 31A and 31B (base portions 34A and 34B).

  For example, an insulating cover 40 made of an insulating resin molding is fitted between the bobbin 10 and interposed between the windings 20A and 20B and the core 30, and is covered with the bobbin 10 from below. As shown in FIG. 2, the insulating cover 40 includes first to fourth side wall portions 41, 42, 43A, 43B, a bottom portion 45, first and second leg portions 46, 47, and a flat plate portion 48A. , 48B.

  The first and second side wall portions 41 and 42 are located between the windings 20A and 20B and the outer leg portions 33A and 33B of the E-type cores 31A and 31B, respectively, and face each other with the winding drum portion 11 interposed therebetween. . The bottom portion 45 is formed so as to pass the lower ends of the first and second side wall portions 41 and 42. Note that windows 49A and 49B for heat dissipation are formed in the bottom 45.

  The first and second leg portions 46 and 47 extend downward on the outer sides of the outer leg portions 33A and 33B across the upper sides of the outer leg portions 33A and 33B of the E-shaped cores 31A and 31B, respectively. It extends from the first and second side wall portions 41 and 42 and faces each other with the winding drum portion 11 in between. Here, as shown in FIG. 1C, the lower end positions of the first and second leg portions 46, 47 are above the lower end positions of the E-type cores 31A, 31B and abut against the printed circuit board 26. Therefore, the horizontal coil component 100 is mounted by dropping a portion below the lower end position of the first and second leg portions 46 and 47 into the opening 28 of the printed circuit board 26.

  The third and fourth side wall portions 43A and 43B are located between the flange portions 12A and 12B of the bobbin 10 and the base portions 34A and 34B of the E-type cores 31A and 31B, respectively. , 42 is formed so as to pass between the lateral ends. Openings 51A and 51B are formed in the third and fourth side wall portions 43A and 43B so as to communicate with the core insertion hole 16 of the bobbin 10, respectively. The flat plate portions 48A and 48B are located between the terminal blocks 13A and 13B of the bobbin 10 and the base portions 34A and 34B of the E-type cores 31A and 31B and extend from the third and fourth side wall portions 43A and 43B, respectively. It is formed.

  Hereinafter, assembly of the horizontal coil component 100 and mounting on the printed circuit board 26 will be described.

  In a state before assembly, the terminals 14A and 14B only protrude outward in the axial direction of the winding drum portion 11 from the terminal blocks 13A and 13B, and are not bent downward. First, the insulating cover 40 is put on and fitted from below the bobbin 10 to which the windings 20A and 20B are applied. The central leg portions 32A and 32B of the E-type cores 31A and 31B are inserted into the core insertion holes 16 of the bobbin 10 through the openings 51A and 51B formed in the third and fourth side wall portions 43A and 43B of the insulating cover 40, The outer legs 33A and 33B are butted together. Then, the horizontal coil component 100 is completed by bending the terminals 14A and 14B into an L pin shape. In the horizontal coil component 100, the lower end positions of the first and second legs 46 and 47 of the insulating cover 40 are brought into contact with the printed circuit board 26, and the terminals 14A and 14B are inserted into the through holes 27A and 27B of the printed circuit board 26. By connecting to the wiring pattern on the back side (lower surface) of the printed circuit board 26 by soldering or the like, it is dropped into the opening 28 of the printed circuit board 26 and mounted on the printed circuit board 26.

  According to the present embodiment, the following effects can be achieved.

(1) The terminal blocks 13A and 13B of the bobbin 10 are positioned above the E-type cores 31A and 31B (base portions 34A and 34B), and the terminals 14A and 14B protruding from the terminal blocks 13A and 13B are bent downward and printed. An insulating cover 40 inserted through the through holes 27A and 27B of the substrate 26 and interposed between the windings 20A and 20B and the core 30 covers the bobbin 10 from below, and the first and second legs of the insulating cover 40 are provided. Since the lower end positions of the portions 46 and 47 are above the lower end position of the core 30 and abut against the printed circuit board 26, the weight of the horizontal coil component 100 is supported by the first and second leg portions 46 and 47. It becomes possible. For this reason, it is difficult to place a burden on the connection portion between the terminals 14A and 14B and the printed circuit board 26, and the connection reliability between the terminals 14A and 14B and the printed circuit board 26 can be improved.

(2) Further, the load applied to the terminals 14A and 14B is reduced, stable mounting is possible, and the height accuracy is good. That is, the drop depth of the horizontal coil component 100 when mounted on the printed circuit board 26 is determined by the height of the first and second legs 46 and 47 of the insulating cover 40 that is a molded body. The mounting height is high accuracy. In this regard, in the configuration as in Patent Document 1, the height at the time of mounting varies depending on how the terminals are bent, and is unstable. For example, a comma of about 5 mm is easily shifted. Alternatively, it is conceivable that the shape of the terminal changes and the height shifts when the winding terminal is tied to the terminal. In recent years, the height direction is severely limited in the trend of low profile, and no margin can be obtained. Therefore, stabilization of height accuracy is important for improving the yield and speeding up the manufacturing process.

(3) Since the terminal blocks 13A and 13B are positioned above the E-type cores 31A and 31B (base portions 34A and 34B), it is possible to use normal L pin terminals as the terminals 14A and 14B protruding from the terminal blocks 13A and 13B. This eliminates the need for forming terminals for dropping into the printed circuit board 26, thereby reducing the mounting area on the printed circuit board 26 (see FIG. 3).

  The present invention has been described above by taking the embodiment as an example. However, it will be understood by those skilled in the art that various modifications can be made to each component of the embodiment within the scope of the claims. Hereinafter, modifications will be described.

  In the embodiment, the case where the horizontal coil component 100 is a transformer has been described. However, in a modification, the horizontal coil component may be a choke coil.

  In the embodiment, the case where the core 30 is a combination of the E-type cores 31A and 31B has been described. However, in the modification, a combination of the E-type core and the I-type core may be used.

It is explanatory drawing of the horizontal type | mold coil component which concerns on embodiment of this invention, (A) is the perspective view seen from upper direction, (B) is the perspective view seen from the downward direction, (C) is a front view, (D) is Bottom view. The disassembled perspective view of the same horizontal coil component. The typical contrast figure of the L pin terminal of the same horizontal coil component, and the terminal which formed for dropping.

Explanation of symbols

10 Bobbin 11 Winding body portion 12A, 12B Hook portion 13A, 13B Terminal block 14A, 14B Terminal 15 Middle rod 16 Core insertion hole 20A, 20B Winding 26 Printed circuit board 27A, 27B Through hole 28 Opening 30 Core 31A, 31B E type core 32A, 32B Central leg 33A, 33B Outer leg 34A, 34B Base 40 Insulation cover 41, 42, 43A, 43B First to fourth side walls 45 Bottom 46, 47 First and second legs 48A, 48B Flat part 100 Horizontal coil parts

Claims (4)

A bobbin having a winding drum, a flange formed on each side of the winding drum, a terminal block formed on at least one hook, and a terminal protruding from the terminal block;
A winding that is applied to the winding body of the bobbin, and a terminal is electrically connected to the terminal;
A core that forms a closed magnetic path, with a central leg inserted through the inside of the bobbin and an outer leg surrounding the outside of the bobbin;
An insulating cover interposed between the winding and the core and fitted to the bobbin;
It is a horizontal coil component that is dropped into the opening of the printed circuit board having an opening and mounted on the printed circuit board, and when the mounting direction of the horizontal coil component is downward,
The terminal block is located above the core;
The terminal is bent downward and inserted into the through hole of the printed circuit board,
The insulating cover is covered with the bobbin from below, and has first and second leg portions extending downward on the outside of the outer leg portion across the upper side of the outer leg portion of the core, The first leg and the second leg are opposed to each other across the winding drum part, and the lower end position of the first and second leg part is above the lower end position of the core, and A horizontal coil component that contacts the printed circuit board.   The horizontal coil component according to claim 1, wherein the terminal is an L pin terminal.   3. The horizontal coil component according to claim 1, wherein the insulating cover is positioned between the winding and an outer leg portion of the core, and is opposed to each other with the winding body portion interposed therebetween. A horizontal coil component having two side wall portions, wherein the first and second leg portions are formed extending from the first and second side wall portions, respectively.   The horizontal coil component according to any one of claims 1 to 3, wherein the core is a combination of a first core made of an E-type core and a second core made of an E-type core or an I-type core. A horizontal coil component in which a central leg portion of the E-type core is inserted inside the bobbin.

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