JP2013048281A - Method of manufacturing inductor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily obtain a method of manufacturing a space-saving type inductor in which an installation space is easily secured on a substrate and an installation space of the other component is easily secured in the peripheral part.SOLUTION: In a method of manufacturing an inductor, when or after terminal parts 4A and 4B each having a mounting part 42 mounted on a substrate and a connection part 41 extending in parallel with the mounting part 42 are fixed to the end surface of a lower flange part 23 of a drum core 2 having upper and lower flange parts 22 and 23 on both ends of a winding shaft, and an end of a winding 3 wound around the winding shaft is connected to the connection part 41, one end of the connection part 41 is raised upward and the whole is disposed in a regular square circumscribed to a projection region of the flange parts.

Description

  The present invention relates to a method for manufacturing an inductor in which a terminal portion made of a plate-like metal member is closely fixed to a drum core around which a winding is wound, and in particular, a cellular phone, a portable music media device, a portable game machine, The present invention relates to a method for manufacturing an inductor suitable for mounting on a power supply circuit of an electronic device which is highly demanded to be small (thinned) such as a small video camera.

  As this type of inductor, one described in Patent Document 1 below is known. The inductor described in this publication is provided with a strip-shaped small protrusion that abuts on the side surface of the lower collar portion of the drum core on the periphery of a plate-shaped metal member (metal piece) that forms the binding terminal portion and the electrode portion. It is comprised so that the precision of positioning with a plate-shaped metal member may be improved.

Japanese Patent Laid-Open No. 10-22137

  In recent years, electronic devices using this type of inductor have been miniaturized, and accordingly, there is an increasing demand for miniaturization of inductors mounted on circuit boards. In particular, due to the necessity of mounting a large number of electrical (electronic) components on a narrow circuit board, not only the mounting area on the substrate is small, but it is also easy to secure a space for arranging other components in the periphery. Space-saving inductors are desired.

  The present invention has been made in view of such circumstances, and provides an inductor manufacturing method in which it is easy to secure an installation space on a substrate and to easily secure an arrangement space for other components in a peripheral portion. With the goal.

In order to achieve the above object, an inductor manufacturing method according to the present invention includes a drum core in which a substantially circular upper collar part and a lower collar part are respectively formed at both ends of a winding shaft part, and a winding core part wound around the drum core. And a terminal portion made of a plate-shaped metal member that is tightly fixed to the end face of the lower collar portion, and a method of manufacturing an inductor comprising:
The terminal portion includes a flat mounting portion mounted on the substrate, a connecting portion to which one end portion extends in parallel with the mounting portion and to which the end portion of the winding is connected, and upward from the side of the mounting portion. Two sets of parallel sides of a circumscribed square that circumscribes the terminal portion, and the side portion of the mounting portion circumscribes at least a circular flange portion of each of the flange portions that is not a small diameter. The upper surface of the mounting portion is fixed to the end surface of the lower collar portion of the drum core so as to extend and be arranged in a direction parallel to any of the above,
Next, the winding is wound around the winding shaft portion, and an end of the winding is connected to the connection portion. When winding the winding around the winding shaft portion, the connection portion One end portion of the winding extends parallel to the surface of the mounting portion and protrudes outside the circumscribed square, and when the end portion of the winding is entangled with the connecting portion or after the entanglement, the one end portion is directed upward Standing up and placing in the circumscribed square,
In a state in which the inductor is orthogonally projected in the axial direction of the winding shaft portion, the projection region of the terminal portion fits within a square that circumscribes at least the projection region of the flange portion that is not a small diameter among the flange portions. It is characterized by that.

  According to the inductor manufacturing method of the present invention, in a state in which the projection is orthogonally projected in the axial direction of the winding shaft portion, the projection region of the terminal portion is at least the projection region of the flange portion which is not a small diameter among the flange portions. By being configured to fit within a circumscribed square, the own mounting space occupied on the board is limited to a predetermined square area. For this reason, it is easier to secure the installation space on the board than the conventional one where its own mounting space does not fit in the square area, and other parts are more efficient around the set square area. It becomes possible to arrange it well and compact, and it can be manufactured easily.

It is a perspective view from the front side of an inductor concerning one embodiment manufactured by the present invention. It is a front view of the drum core shown in FIG. It is a perspective view from the back side of the terminal part shown in FIG. It is a perspective view from the bottom face side which shows the state by which the terminal part was tightly fixed to the drum core. It is a top view of an inductor concerning one embodiment. It is a top view of the inductor which concerns on other embodiment.

  Hereinafter, embodiments of an inductor formed by the manufacturing method according to the present invention will be described in detail with reference to the accompanying drawings. 1 to 5 show an embodiment of an inductor manufactured according to the present invention, and FIG. 6 shows another embodiment. In the following description, the direction of the X axis of the three-dimensional orthogonal coordinate system shown in FIG. 1 is the front and back (the direction of the arrow is forward), the direction of the Y axis is the left and right (the direction of the arrow is right), The direction is referred to as up and down (the direction of the arrow line is up). In addition, the three-dimensional orthogonal coordinate system in the other figures is shown so that the direction coincides with that in FIG.

  First, the configuration of an inductor according to an embodiment of the present invention will be described with reference to FIGS. 1 is a perspective view from the front side showing the overall configuration of the inductor according to one embodiment of the present invention, FIG. 2 is a front view of the drum core shown in FIG. 1, and FIG. 3 is a back view of the terminal portion shown in FIG. It is a perspective view. FIG. 4 is a perspective view from the bottom side showing a state in which the terminal portion is closely fixed to the drum core.

  The inductor 1 of this embodiment is mounted on a power supply circuit of an electronic device such as a mobile phone, a portable music media device, a portable game machine, and a small video camera, for example. As shown in FIG. And a winding 3 and a pair of terminal portions 4A and 4B.

As shown in FIG. 2, the drum core 2 includes a column-shaped winding shaft portion 21 around which the winding 3 (see FIG. 1) is wound, and upper and lower ends of the winding shaft portion 21 (the axis C _{1 of the} winding shaft portion 21). Are formed integrally with each other, for example, a ferrite of soft magnetic material (in addition to the ferrite (other than , Permalloy, sendust, iron carbonyl, etc., and a dust core obtained by compression molding these fine powders can also be used. The upper collar portion 22 and the lower collar portion 23 are formed so as to have the same outer diameter.

  On the other hand, as shown in FIG. 3, the terminal portions 4A and 4B are each formed of a plate-like metal member, and are connected to the end of the winding 3 (see FIG. 1). 41, a mounting portion 42 mounted on a circuit board (not shown), and a pair of bent portions 43 bent upward from one side surface of the mounting portion 42. As shown in FIG. 4, the terminal portions 4A and 4B are arranged so that the connecting portion 41 and the bent portions 43 protrude to the side surface of the lower collar portion 23, and the upper surface of the mounting portion 42 The adhesive is applied between the bottom surface of the lower collar part 23 and is fixed to the bottom surface of the lower collar part 23 by an adhesive.

  Further, in the state shown in FIG. 4 in which the terminal portions 4A and 4B are closely fixed to the lower collar portion 23, one end portion of the connection portion 41 is bent forward, but the end portion of the winding 3 As shown in FIG. 1, the bent portion is configured to be extended upward when or is entangled.

  As shown in FIG. 1, the inductor 1 configured in this way is placed on the substrate with the bottom side of the lower collar 23 facing a circuit substrate (not shown), and each terminal portion 4A , 4B are fixed to the circuit board by being soldered to the substrate surface, and solder fillets (between the respective bent portions 43 and the substrate surface ( By visually recognizing the state (not shown), it can be confirmed whether or not the soldering is properly performed.

Next, main features of the inductor 1 will be described with reference to FIG. Figure 5 is a plan view of an inductor according to an embodiment of the present invention (FIG state where the inductor 1 are orthogonally projected in the direction of the axis C _1).

5 the inductor 1 as shown in the said inductor 1 in a state where the orthogonal projection in the direction of the axis C _1, the respective terminal portions 4A, the projection area of 4B is the flange portion 22 (the lower flange portion 23 ) Within a square 5 (indicated by a two-dot chain line in the figure) circumscribing the projection area. In addition, the projection region at each end of the winding 3 entangled with the connecting portion 41 of each terminal portion 4A, 4B is also configured to be within the square 5.

  As a result, the mounting space of the inductor 1 on the circuit board (not shown) is limited to the area of the square 5, so that it is easy to secure the installation space for the inductor 1 on the board, Other parts can be efficiently and compactly arranged around the periphery of the square 5 region.

  Next, another embodiment of the inductor according to the present invention will be described with reference to FIG. FIG. 6 is a plan view of an inductor according to another embodiment of the present invention. In the embodiment shown in FIG. 6, components that are conceptually common to those shown in FIGS. 1 to 5 are assigned the same numbers and the like, and detailed descriptions thereof are omitted.

An inductor 1A shown in FIG. 6 includes a drum core 2, a winding 3, and a pair of terminal portions 4C and 4D. The feature of the inductor 1A is the configuration of the terminal portions 4C and 4D. That is, the inductor 1A shown in Figure 6, in a state where the inductor 1A orthogonally projected in the direction of the axis C _1, the respective terminal portions 4C, a projected area of each bent portion 43 in 4D, the inductor 1 The projected area of the solder fillet 6 formed when the bent portion 43 is soldered to a substrate surface (not shown) is also accommodated in the square 5.

  For this reason, the mounting space of the inductor 1A on the circuit board is limited to the area of the square 5 including the portion where the solder fillet 6 is formed. It is easy to secure an installation space for the inductor 1A on the substrate, and it is possible to arrange other components more efficiently and compactly in the periphery of the square 5 region.

  As mentioned above, although the embodiment of the inductor manufactured by the present invention has been described, the inductor manufactured by the present invention is not limited to the above-described embodiment, and various modifications can be made. .

  For example, in the above-described embodiment, the upper flange portion 22 and the lower flange portion 23 of the drum core 2 are formed so as to have the same outer diameter size, but the flange portions may not have different outer diameter sizes. An equal drum core can be used. In the case of an inductor using an unequal drum core, it is sufficient that the projected area of the terminal portion is accommodated in a square circumscribing the projected area of the flange portion having a smaller diameter of both flange portions.

DESCRIPTION OF SYMBOLS 1,1A Inductor 2 Drum core 3 Winding 4A-4D Terminal part 5 Square 6 Solder fillet 21 Winding axis part 22 Upper collar part 23 Lower collar part 41 Connection part 42 Mounting part 43 Bending part C ₁ axis

Claims (1)

A drum core in which a substantially circular upper collar part and a lower collar part are respectively formed at both ends of the winding shaft part, a winding wound around the winding shaft part, and a plate that is tightly fixed to the end surface of the lower collar part A manufacturing method of an inductor comprising: a terminal portion made of a metal member;
The terminal portion includes a flat mounting portion mounted on the substrate, a connecting portion to which one end portion extends in parallel with the mounting portion and to which the end portion of the winding is connected, and upward from the side of the mounting portion. Two sets of parallel sides of a circumscribed square that circumscribes the terminal portion, and the side portion of the mounting portion circumscribes at least a circular flange portion of each of the flange portions that is not a small diameter. The upper surface of the mounting portion is fixed to the end surface of the lower collar portion of the drum core so as to extend and be arranged in a direction parallel to any of the above,
Next, the winding is wound around the winding shaft portion, and an end of the winding is connected to the connection portion. When winding the winding around the winding shaft portion, the connection portion One end portion of the winding extends parallel to the surface of the mounting portion and protrudes outside the circumscribed square, and when the end portion of the winding is entangled with the connecting portion or after the entanglement, the one end portion is directed upward Standing up and placing in the circumscribed square,
In a state in which the inductor is orthogonally projected in the axial direction of the winding shaft portion, the projection region of the terminal portion fits within a square that circumscribes at least the projection region of the flange portion that is not a small diameter among the flange portions. An inductor manufacturing method characterized by the above.

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