JP2010067626A - Coil unit - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a coil unit which improves handling by vacuum sucking, is easy in attaching of a core member and core combination member to a circuit substrate, suppresses increase in height of the core combination member, and prevents deviation between the core member and the core combination member. <P>SOLUTION: Core leg inserting holes 10a, 10b, and 10c are formed at a circuit substrate 42. A coil pattern 43 is formed around the core leg inserting hole 10b at the center. Three core legs of a core member 54a are inserted into the core leg inserting holes 10a, 10b, and 10c, and the circuit substrate 42 is sandwiched between the core member 54a and a core member 54b. The core member 54a and the core member 54b are secured in such state as combined with a core combination member 71, being secured to the circuit substrate 42 as well. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a coil device that functions as a transformer or a choke coil.

  Patent Document 1 discloses a coil device in which a coil pattern formed on a circuit board is sandwiched between a pair of core members from both front and back sides of the circuit board.

  FIG. 1 is a cross-sectional view and a side view of the coil device disclosed in Patent Document 1. The core combination member 5 includes a base surface portion 20, an arm portion 21, and a core fixing leg portion 22.

The base surface part 20 is a part that presses the outer surface 8a of the core member 4a. The core fixing legs 22 of the core combination member 5 press the board surface of the circuit board 2 to fix the core combination member 5 to the circuit board 2.
The core fixing leg portion 22 is provided with a substrate surface abutting portion 30 that abuts against the substrate surface of the circuit board 2 at the tip portion thereof. The core fixing leg portion 22 is provided with a spring portion 31 on the base surface portion 20 side. The spring portion 31 urges the substrate surface abutting portion 30 toward the surface side of the circuit board 2.

The core fixing leg 22 fixes the core combination member 5 to the circuit board 2 by the board surface contact part 30 at the tip pressing the surface of the circuit board 2 by the elastic pressure by the spring part 31.
Japanese Patent No. 4100036

  However, in the coil device shown in Patent Document 1, the spring portion 31 is provided so that the circuit board 2 is pressed from above by the core fixing leg portion 22, and the spring portion 31 is provided with the core members 4 a and 4 b. There is a problem that the upper portion of the core combination member is projected to be higher than the spring portion 24 of the arm portion 21 for combining them, and the flat portion on the upper surface of the core combination member is very narrow, and handling by vacuum suction during mounting is poor.

  Moreover, the spring part 31 will protrude above the spring part 24 of the arm part 21 for combining core member 4a, 4b, and the height of the coil apparatus 1 comprised with respect to the circuit board 2 will become high. There was a problem.

  In another embodiment (first embodiment) shown in Patent Document 1, the claw portion 26 at the tip end of the core fixing leg is engaged with the lower surface side of the circuit board 2, so that the coil device as a whole Although the height dimension of the core is small, the core fixing leg part together with the arm part of the core combination member must be simultaneously inserted into the core leg insertion hole formed in the circuit board, and the function during assembly is poor. There was a problem.

  Furthermore, in the coil device of Patent Document 1, the claw portion 23 formed at the tip of the arm portion of the core combination member only abuts on the flat outer surface of the core member 4b. There has also been a problem that the member 4 (4a, 4b) is displaced in a direction perpendicular to the paper surface in FIG.

  Accordingly, an object of the present invention is to improve handling by vacuum suction at the time of mounting, facilitate the attachment of the core member and the core combination member to the circuit board, suppress an increase in the height dimension of the core combination member, and An object of the present invention is to provide a coil device that prevents a positional deviation between a core member and a core combination member.

In order to solve the above problems, the present invention is configured as follows.
(1) A coil pattern formed on the circuit board, a pair of core members mounted on the coil pattern in a form in which the coil pattern is sandwiched from both the front and back sides of the circuit board, and a coil pattern forming region. A coil device having a core leg insertion hole through which a core leg provided in at least one of the pair of core members is inserted, and a core combination member that combines the pair of core members using the core leg insertion hole. And
The core combination member includes a base surface portion that presses a core outer surface of one core member of the pair of core members, an arm portion that extends from the base surface portion on the core leg side surface of the core member along the core leg extending direction, and The pair of core members provided at the tip of the arm portion and engaged with the other core pressing member that presses the core outer surface of the other core member or directly engaged with the core outer surface of the other core member A core combination member fixing piece that protrudes from the base surface portion toward the core end surface and extends along the core end surface of the core member, and fixes the core combination member to the circuit board. Configured
The core combination member fixing piece has elasticity, and the tip of the core combination member fixing piece presses the surface of the circuit board by elastic pressure to fix the core combination member to the circuit board. To do.

  With this configuration, since a flat surface spreads from the base surface portion to the arm portion, the suction force by vacuum suction during mounting is improved.

  Moreover, a core combination member fixing piece can be comprised independently of the arm part along the core leg extending | stretching direction of the core leg side surface of a core member from a base surface part, This core combination member fixing piece is extended along the core end surface of a core member. By providing in this way, it can comprise, without increasing the height dimension of a core combination member.

  Furthermore, since only the arm portion has to be inserted into the core leg insertion hole provided in the circuit board, assembly is facilitated and manufacturing cost can be reduced.

(2) For example, the engaging portion is provided inwardly at the distal end of the arm portion, presses the outer surface of the core of the other core member, and holds the pair of core members between the base surface portions. And protrusions formed on both ends of the claw portion in the width direction and sandwiching the core member between the core end surfaces facing each other.

  Thereby, a projection part will pinch | interpose a core member in the end surface, and the position shift of the core member with respect to a core combination member can be prevented.

(3) For example, the said other core press member shall be provided with the base surface part which covers the core outer surface plane of said other core member.

  Thereby, since a flat surface spreads also to the back surface side (the other core pressing member side), adsorption | suction by the vacuum suction of the back surface side is also attained. Moreover, the outer surface of the core member which makes a pair will be covered with a core combination member and the other core pressing member, and it can prevent that a core member is cracked by the impact at the time of adsorption | suction by a mounter.

  According to this invention, since the flat surface spreads from the base surface portion to the arm portion, the suction force by vacuum suction is improved. Moreover, a core combination member fixing piece can be comprised independently of the arm part along the core leg extending | stretching direction of the core leg side surface of a core member from a base surface part, This core combination member fixing piece is extended along the core end surface of a core member. By providing in this way, the core combination member can be reduced in height. Furthermore, since only the arm portion has to be inserted into the core leg insertion hole provided in the circuit board, assembly is facilitated and manufacturing cost can be reduced.

<< First Embodiment >>
FIG. 2 is an exploded perspective view of the coil device 81 according to the first embodiment. 3A is a plan view of the coil device 81, and FIG. 3B is a cross-sectional view of the BB portion in FIG. 3A. FIG. 4 is a partial perspective view of the core combination member 71. FIG. 5 shows names of the respective surfaces of the core member.

  As shown in FIG. 2, core leg insertion holes 10 a, 10 b, and 10 c are formed in the circuit board 42. Of these, a coil pattern 43 is formed around the central core leg insertion hole 10b. In this example, an E-shaped core member 54a and an I-shaped core member 54b are provided. Three core legs of the core member 54a are inserted into the core leg insertion holes 10a, 10b, 10c, and the circuit board 42 is sandwiched between the core member 54a and the core member 54b. The core member 54 a and the core member 54 b are fixed in a state where they are combined by the core combination member 71 and are fixed to the circuit board 42.

  The core combination member 71 includes a base surface portion 60 that presses the outer surface of the core of the core member 54a, an arm portion 61 that extends from the base surface portion 60 on the core leg side surface of the core member 54a along the core leg extending direction, and the arm portion 61 A claw portion 63 that is bent inward at the tip and presses the outer surface of the core of the other core member 54b to sandwich the pair of core members (54a, 54b) with the base surface portion 60; And a core combination member fixing piece 62 that protrudes in the direction of the core end surface and extends along the core end surface of the core member 54 a and fixes the core combination member 71 to the circuit board 42.

  The core combination member 71 is obtained by punching and bending a metal plate having elasticity such as phosphor bronze. Therefore, the arm part 61 has elasticity. With the circuit board 42 sandwiched between the core members 54a and 54b, the core combination member 71 is covered from the core member 54a side, and the arm portions 61 and 61 are inserted into the core leg insertion holes 10a and 10c of the circuit board 42, By further pushing, the claw portion 63 engages with the lower surface (core outer surface plane) of the core member 54b.

  As shown in FIG. 3A, the width dimension of the arm portion 61 of the core combination member 71 is substantially equal to the longitudinal dimension of the core leg insertion holes 10a, 10c formed in the circuit board 42. As a result, positioning in the direction perpendicular to the core end surface is performed.

  FIG. 4 is a partial perspective view in a state where the tip end portion of the arm portion 61 of the core combination member 71 is turned over from the state shown in FIG. 2. Protrusions 64 and 64 are provided at both ends of the claw portion 63 in the width direction. As shown in FIG. 3B, the claw portion 63 abuts on the lower surface (the outer surface of the core) of the core member 54b, and the projecting portions 64 and 64 sandwich the two core end surfaces of the core member 54b.

  Therefore, the core combination member 71 and the core members (54a, 54b) are positioned in a direction perpendicular to the core end surface. That is, it does not shift in that direction.

  It should be noted that when the coil device 81 is assembled, when the vacuum suction head of the mounting machine comes into contact with the upper surface of the core combination member 71 of the coil device 81 and when it is used, the core combination member fixing piece 62 causes elasticity to increase the core. The impact on the members 54a and 54b is suppressed. Therefore, the cracks of the core members 54a and 54b can be effectively prevented.

<< Second Embodiment >>
FIG. 6 is a perspective view of the core combination member 72 used in the coil device according to the second embodiment. What is different from the core combination member 71 shown in FIG. 2 is the shape of the core combination member fixing piece 65.

  In FIG. 2, the tip of the core combination member fixing piece 62 is slightly bent and brought into surface contact with the upper surface of the circuit board 42. However, in the core combination member 72 shown in FIG. It is formed as a bent portion 66 that faces in a direction perpendicular to the circuit board. The main part of the core combination member fixing piece 65 is flat so as to be substantially flush with the base surface part 60.

  With such a shape, a wide flat region can be secured on the upper surface of the core combination member 72, and handling in the vacuum suction device is improved.

<< Third Embodiment >>
FIG. 7 is an exploded perspective view of the core combination member 73 used in the coil device according to the third embodiment. Unlike the first and second embodiments, the coil device according to the third embodiment includes a core combination member 73 and the other core pressing member 74. The configuration of the core members 54a and 54b and the configuration of the circuit board 42 are the same as those shown in the first and second embodiments.

  The core combination member 73 includes a base surface portion 60 that presses the outer surface of the core of the core member 54a, an arm portion 61 that extends from the base surface portion 60 on the core leg side surface of the core member 54a along the core leg extending direction, and the arm portion 61 It has an engaging protrusion 67 that protrudes in part.

  On the other hand, the other core pressing member 74 includes a base surface portion 60 that presses the outer surface of the core of the core member 54b, an arm portion 61 extending from the base surface portion 60 to the core leg side surface of the core member 54a along the core leg extending direction, An engagement hole 68 opened in a part of the portion 61 is provided.

  The three core legs of the core member 54a are inserted into the core leg insertion holes 10a, 10b, 10c of the circuit board 42, and the circuit board 42 is sandwiched between the core member 54a and the core member 54b. The core member 54 a and the core member 54 b are fixed in a state where the core combination member 73 and the other core pressing member 74 are combined, and are fixed to the circuit board 42.

  That is, in a state where the core combination member 73 and the other core pressing member 74 are combined, the engagement hole 68 of the other core pressing member 74 is covered and locked to the engagement protrusion 67 of the core combination member 73. In this state, the base surface portion 60 of the core combination member 73 presses the outer surface plane of the core member 54a, and the base surface portion 60 of the core pressing member 74 presses the outer surface surface of the core member 54b (the lower surface in the state shown in the figure). .

  In the example shown in FIG. 7, the core combination member fixing piece 65 is provided only on the core combination member 73 side, but the core combination member fixing similar to the core combination member fixing piece 65 is also provided on the other core pressing member 74 side. A piece may be provided, and the circuit board 42 may be sandwiched between these core combination member fixing pieces.

It is sectional drawing and a side view of the coil apparatus shown by patent document 1. FIG. It is a disassembled perspective view of the coil apparatus 81 which concerns on 1st Embodiment. 3A is a plan view of the coil device 81, and FIG. 3B is a cross-sectional view of the BB portion in FIG. 3A. 7 is a partial perspective view of a core combination member 71. FIG. It is a figure showing the name of each surface of a core member. It is a perspective view of the core combination member 72 used for the coil apparatus which concerns on 2nd Embodiment. It is a disassembled perspective view of the core combination member 73 used for the coil apparatus which concerns on 3rd Embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 42 ... Circuit board 43 ... Coil pattern 54a, 54b ... Core member 60 ... Base surface part 61 ... Arm part 62, 65 ... Core combination member fixing piece 63 ... Claw part (engagement part)
64 ... Projection part 66 ... Bending part 67 ... Engagement protrusion (engagement part)
68 ... engaging hole 71, 72, 73 ... core combination member 74 ... other core pressing member 81 ... coil device

Claims (3)

A coil pattern formed on the circuit board, a pair of core members mounted on the coil pattern in a form sandwiching the coil pattern from both front and back sides of the circuit board, and the pair of core members provided in the coil pattern forming region A coil device having a core leg insertion hole for inserting a core leg provided in at least one of the core members, and a core combination member for combining the pair of core members using the core leg insertion hole,
The core combination member includes a base surface portion that presses a core outer surface of one core member of the pair of core members, an arm portion that extends from the base surface portion on the core leg side surface of the core member along the core leg extending direction, and The pair of core members provided at the tip of the arm portion and engaged with the other core pressing member that presses the core outer surface of the other core member or directly engaged with the core outer surface of the other core member A core combination member fixing piece that protrudes from the base surface portion toward the core end surface and extends along the core end surface of the core member, and fixes the core combination member to the circuit board. Configured
The core combination member fixing piece has elasticity, and the tip of the core combination member fixing piece presses the surface of the circuit board by elastic pressure to fix the core combination member to the circuit board. Coil device to do.   The engaging portion is provided inwardly at the distal end of the arm portion, presses the outer surface of the core of the other core member, and holds the pair of core members between the base surface portion and the claw portion The coil device according to claim 1, further comprising protrusions formed at both ends in the width direction of the core member and sandwiching the core member between mutually facing core end surfaces.   The said other core press member is a coil apparatus of Claim 1 provided with the base surface part which covers the core outer surface plane of said other core member.

Images