JP2006013360A - Coil apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To generate useless spaces hardly in the mounting portion of a surface-mounted transformer apparatus which is present on a printed board. <P>SOLUTION: The shape of a second core 40 is a nearly square frame, and has four orthogonal sides 41-44 of the frame. Terminal members 60 are provided in the respective sides 41-44 of the frame. Terminals 120 comprising bottom plates 61 of the terminal members 60 for connecting terminal pads therewith are positioned on respective sides 131 of a square 130. Consequently, the wiring patterns derived from the terminal pads present on a printed board are so formed as to be extended in the direction of X1-X2 or Y1-Y2. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a coil device, and more particularly to a transformer device used by being surface-mounted on a printed circuit board.

  FIG. 11 shows a conventional surface mounted device (SMD) transformer device 1. The surface-mount transformer device 1 has a configuration in which a drum core 2 around which three coils are wound is incorporated in a ring-shaped ring core 4 to which six terminal members 3 are fixed. The six terminal members 3 are arranged radially along the circle 4 as indicated by a two-dot chain line in FIG.

  As shown in FIG. 10B, the portion of the printed circuit board 10 where the transformer device 1 is mounted has terminal pads 11 arranged at the end of the wiring pattern 11 in an arrangement corresponding to the six terminal members 3. It is a configuration. X1-X2 is the horizontal direction of the printed circuit board 10, and Y1-Y2 is the vertical direction of the printed circuit board 10.

The transformer device 1 is surface-mounted by soldering each terminal member 3 to a corresponding terminal pad 11.
JP 2003-224026 A

  The transformer device 1 is mounted on a printed circuit board 10 together with other electronic components to form a printed circuit board unit, and this printed circuit board unit is finally incorporated in an electronic apparatus. Along with the downsizing of electronic devices, downsizing of printed circuit board units is required.

  Looking at the portion of the printed circuit board 10 where the transformer device 1 is mounted, since the arrangement of the terminal pads 11 is radial, some of the wiring patterns 12 extend obliquely and are routed. . Each wiring pattern 12 is connected to a main wiring pattern extending in the X1-X2 or Y1-Y2 direction. Since the wiring pattern 12 extends obliquely and is routed, an extra space is required in a portion up to the main wiring pattern, which is not preferable for downsizing the printed circuit board unit. It was.

  Then, this invention aims at providing the coil apparatus which solved the said subject.

The present invention includes a drum-shaped first core having a coil,
A second core combined with the first core and surrounding the first core and the coil;
A terminal member for surface mounting provided on the second core;
In the coil device having a configuration in which the first core and the second core constitute a magnetic circuit, and an end of a wire forming the coil is connected to the terminal member.
The second core (40) has a quadrangular frame shape having four frame sides (41 to 44),
And the said terminal member (60) is being fixed to each frame side part of this 2nd core,
The terminal pad connecting terminal portion (120) connected to the terminal pad on the printed circuit board among the terminal members is configured to be disposed substantially on the side (131) of the square (130). Features.

  According to the present invention, when the portion of the printed circuit board on which the transformer device is mounted is viewed, the terminal pads are arranged in the middle of each side of the square, and the direction of the wiring pattern extending from the terminal pads is X In addition, there is no wiring pattern extending in an oblique direction in the Y direction, and no useless space is formed.

  Next, an embodiment of the present invention will be described.

  1 (A), (B), FIG. 2, FIGS. 3 (A) to (C), and FIG. 4 show a surface mount type (SMD) transformer device 20 according to Embodiment 1 of the present invention. 1A is a perspective view of the transformer device 20 viewed from the upper surface side, FIG. 1B is a perspective view of the transformer device 20 viewed from the lower surface side, and FIG. 2 is an exploded perspective view of the transformer device 20. 3 (A) to 3 (C) are a plan view, a front view, and a bottom view of the transformer device 20, and FIG. 4 is a cross-sectional view taken along line IV-IV in FIG. 3 (A). X1-X2 and Y1-Y2 are directions orthogonal to each other on a plane, and Z1-Z2 is a height direction.

  The transformer device 20 includes a first core 21, four coils 31 to 34 wound around the first core 21, a second core 40, and eight terminal members 60 (60-1 to 60-). 8).

[First core 21]
As shown in FIG. 2 and FIGS. 5A and 5B, the first core 21 is made of ferrite, and includes an upper flange portion 22 on the Z1 side, a lower flange portion 23 on the Z2 side, And a cylindrical shaft portion 24 therebetween. Both the upper flange portion 22 and the lower flange portion 23 are disk-shaped and have diameters d1 and d2. The diameters d1 and d2 have a relationship of d1> d2.

[Coil 31-34]
As shown in FIG. 2 and FIG. 5 (A), four wires having a surface insulation are wound around the shaft portion 24 and between the upper flange portion 22 and the lower flange portion 23. And four coils 31-34 are formed. As shown in FIG. 5A, the coils 31 to 34 include two primary coils 31 and 32 and two secondary coils 33 and 34. As shown in FIG. 2, the end portion 35 of each wire extends outward from the first core 21.

[Second core 40]
As shown in FIG. 2 and FIGS. 6A to 6F, the second core 40 is made of ferrite and has a substantially square frame shape with a size surrounding the first core 21. It is a plane and has four frame side portions 41 to 44 that are orthogonal to each other. Between the frame side portion 43 and the frame side portion 45, there is a chamfered portion 45 indicating the direction of the transformer device 20. On the inner side of the second core 40, there is a space 49 having a size that allows the lower flange 23 of the first core 21 to be fitted.

  Each frame side part 41-44 has the upper side collar part support step part 46 which supports the upper side collar part 22 in the center, and the terminal member fixing | fixed part 47, on both sides of this upper side collar part support step part 46, 48 is formed. The terminal member fixing portions 47 and 48 are partially concave. This is because the terminal member is fitted to be positioned, and is not displaced laterally.

[Terminal member 60]
As shown in FIGS. 7 (A), 7 (B) and FIGS. 8 (A) to 8 (F), the terminal member 60 is a press-formed component of a strip-shaped plate material made of phosphor bronze and having a width W1. The terminal member fixing portions 47 and 48 are wrapped and formed, and in the attached state, a portion to be soldered to a terminal pad on the printed circuit board and a portion to which a wire is connected are formed.

  The terminal member 60 is substantially U-shaped, and includes a bottom plate portion 61, an outer rising plate portion 62 rising on one end side of the bottom plate portion 61, and an inner rising plate portion rising on the other end side of the bottom plate portion 61. 63.

  With the terminal member 60 attached to the second core 40 as will be described later, the bottom plate portion 61 constitutes the terminal pad connecting terminal portion 120.

  The outer rising plate portion 62 has a narrow portion 64 whose width is narrowed W2 in the middle thereof, and a portion 65 indicated by a two-dot chain line in FIG. And has a folded overlap portion 67 which is folded back to the inside. The narrow portion 64 is where the wire is wound. As will be described later, the folded-over overlap portion 67 is a portion that is melted by a laser, and a necessary volume to be melted is secured by increasing the thickness.

  The inner rising plate portion 63 has an arm portion 70 that is bent at the tip side opposite to the outer rising plate portion 62. The width of the arm portion 70 is W2, which is equal to the width W2 of the narrow portion 64 described above. The inner rising plate portion 63 has an opening 71 formed in the middle for easy folding. Reference numeral 72 denotes a portion to be bent. As shown in FIG. 9B, when bent at the location of the opening 71, the portion 72 faces the upper surface of the frame side portion 41 and the like, and the arm portion 70 faces the inside of the narrow portion 64 and the narrow portion 64. It will be in a state in line with. The narrow portion 64 and the arm portion 70 constitute a wire connection portion.

  The transformer device 20 is assembled in the following procedure.

(1) Eight terminal members 60-1 to 60-8 are attached to the second core 40.

  First, as shown in FIG. 2, the terminal members 60-1 to 60-8 are fitted from the Z2 side to the terminal member fixing portions 47 and 48 of the frame side portions 41 to 44 of the second core 40 from the Z2 side. The state shown in FIG. Next, as shown in FIG. 9B, the upper end portion of the inner rising plate portion 63 is bent as indicated by an arrow 80. Thereby, the terminal member 60 is in a state of wrapping the frame side portion 41 and the like, and is attached to the frame side portions 41 to 44 of the second core 40 two by two. The bottom plate portion 61 is located on the lower surface of the frame side portion 41 and constitutes a terminal pad connecting terminal portion 120. Further, the arm portion 70 is in a state of being aligned with the narrow portion 64.

(2) The first core 21 formed with the coils 31 to 34 is attached to the second core 40.

  The first core 21 with the wire end portion 35 extending outward is attached to the second core 40. The upper collar 22 is positioned and bonded to the upper collar support step 46 by being fitted. The lower flange 23 and the coils 31 to 34 are in a state of being accommodated in the space 49. The end portion 35 of the wire extends to the outside of the second core 40 through the concave portion 47 and the like on the upper surface side of the second core 40.

  As shown in FIG. 4, the first core 21 and the second core 40 form a magnetic circuit 90. The magnetic circuit 90 has a gap 91 between the lower flange 23 and the second core 40.

(3) The end portion 35 of the wire is wound around the terminal member 60.

  As shown in FIG. 9C, the wire end portions 35 are bundled around the narrow portion 64 and the arm portion 70 in a lined state. That is, the wire end portion 35 is wound around the narrow portion 64 together with the arm portion 70. Reference numeral 100 denotes a wire winding portion around which a wire is wound.

  Here, the portion of the outer rising plate portion 62 where the wire is wound is located on the upper side of the outer peripheral surface of the second core 40 and is located outside the upper flange portion 22, so that the wire is wound. The work is carried out without being disturbed by the upper heel part 22.

  Moreover, since it is the narrow part 64, the position which winds a wire is specified.

(4) The wire connection part 110 is formed by performing laser irradiation.

  As shown in FIG. 9C, the laser 111 is folded back and applied to the overlapping portion 67, and the folded overlapping portion 67 is melted. The melted metal flows down by gravity and reaches the wire winding portion 100, the wire winding portion 100 is welded to the narrow portion 64, and the arm portion 70 is welded to the narrow portion 64. Thereby, the highly reliable wire connection part 110 is formed.

  Thus, the transformer device 20 shown in FIGS. 1, 2, 3, and 4 is completed.

  In the completed transformer device 20, the coils 31 to 34 are incorporated in the magnetic circuit 90 formed by the first core 21 and the second core 40, and the ends of the wires of the coils 31 to 34 are the wire connection portions 110. In this configuration, two terminal members 60 are provided on the four orthogonal frame side portions 41 to 44 of the second core 40.

  As shown in FIGS. 1B and 10A, the terminal pad connecting terminal portion 120 is disposed at a position in the middle of each side 131 of the square 130, and the center line 120a thereof is X1-. The direction extends in the X2 direction or the Y1-Y2 direction.

  Accordingly, in the portion of the printed circuit board 10A where the transformer device 20 is mounted, the terminal pad 11A is in the middle of each side 131A of the square 130A, which is the same as the square 130, as shown in FIG. It is arranged in a position, and its longitudinal direction extends in the X1-X2 direction or the Y1-Y2 direction. Therefore, the wiring pattern 12A extending from the terminal pad 11A extends in the X1-X2 direction or the Y1-Y2 direction, and does not extend obliquely. There is no useless empty space, and the size of the printed circuit board 10A is reduced accordingly.

1 is a perspective view of a surface mount transformer device according to a first embodiment of the present invention. FIG. 2 is an exploded perspective view of the surface mount type transformer device of FIG. 1. It is a figure which shows the surface mount-type transformer apparatus of FIG. FIG. 4 is a cross-sectional view taken along line IV-IV in FIG. It is a figure which shows the 1st core in which the coil is formed. It is a figure which shows a 2nd core. It is a perspective view which shows a terminal member. It is a figure which shows a terminal member. It is a figure which shows the process in which the procedure which attaches a terminal member to a 2nd core, and a wire connection part are formed. It is a figure which shows the case where the surface mounting type | mold transformer apparatus is mounted among the printed circuit boards in the case of the transformer apparatus of a present Example, and the case of the conventional transformer apparatus. It is a figure which shows the conventional surface mount-type transformer apparatus.

Explanation of symbols

10A Printed circuit board 11A Terminal pad 12A Wiring pattern 20 Surface mount type transformer device 21 First core 22 Upper flange 23 Lower flange 24 Shaft 31-34 Coil 40 Second core 41-44 Frame side 45 Chamfer 46 Upper flange support step portion 47, 48 Terminal member fixing portion 49 Space 60 Terminal member 61 Bottom plate portion 62 Outer rising plate portion 63 Inner rising plate portion 64 Narrow portion 67 Folding overlapping portion 70 Arm portion 72 Bending is scheduled Part 100 Wire winding part 110 Wire connection part 120 Terminal pad connection terminal part 130 Square 131 side

Claims (5)

A drum-shaped first core having a coil;
A second core combined with the first core and surrounding the first core and the coil;
A terminal member for surface mounting provided on the second core;
In the coil device having a configuration in which the first core and the second core constitute a magnetic circuit, and an end of a wire forming the coil is connected to the terminal member.
The second core is a square frame having four frame sides,
And the said terminal member is being fixed to each frame side part of this 2nd core,
A coil device characterized in that a terminal pad connecting terminal portion connected to a terminal pad on a printed circuit board among the terminal members is arranged on a substantially square side. The coil device according to claim 1, wherein
The coil device according to claim 1, wherein the terminal pad connecting terminal portion has a configuration in which a center line thereof is oriented in a direction perpendicular to the square side. The coil device according to claim 1, wherein
The surface mounting terminal member has a substantially U shape having a bottom plate portion, an outer rising plate portion, an inner rising plate portion, and an arm portion at the tip of the inner rising plate portion, and the inner rising plate portion. Is bent at an intermediate position, wraps around the frame side part, and the arm part is opposed to a part near the upper end of the outer rising plate part,
The wire is wound around the outer rising plate part and the arm part,
The wound wire is welded to the outer rising plate portion by the melted portion of the upper end portion of the outer rising plate portion, and the arm portion is welded to the outer rising plate portion. Coil device characterized by this. The coil device according to claim 3,
The portion near the upper end of the outer rising plate portion is a narrower portion than other portions,
A coil device characterized in that the wire is wound around a portion having a narrower width than other portions. The coil device according to claim 3,
The surface mounting terminal member is configured to have a portion that is folded and overlapped with the tip of the outer rising plate portion,
A coil device characterized in that the overlapping portion is melted by laser irradiation.

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