JPH03219613A - Manufacture of surface-mounting coil - Google Patents

Abstract

PURPOSE:To shorten the working time and to manufacture this coil at a low cost by a method wherein a coil element in which winding has been executed at opposite long-side parts of a rectangular frame core is used and binding pieces and positioning pieces having stepped parts at their intermediate height are formed at tip rise parts of terminal sheet pieces of a lead terminal frame. CONSTITUTION:Tip parts of terminal sheet pieces 11 are bent and erected rectangularly on the side of a frame part 4 slightly from ends of breaks 12; positioning pieces 13 are bent horizontally to the central side of through holes at the height of the ends of the breaks 12; free ends are erected further rectangularly; stepped parts 14 and erected parts 15 are formed. A coil element 1 is brought into contact at the bottom of its opposite short-side parts and arranged so as to be bridged; then, side edges on the side of binding pieces 7 of the opposite erected parts 15 are coupled to inner-circumference corner parts in respective diagonal-line directions of a core 2; the coil element 1 can be positioned and held. A winding is connected to the binding pieces 7; an outer package is formed by an insulating-resin operation; the terminal sheet pieces 11 are cut and a surface-mounting coil is completed.

Description

DETAILED DESCRIPTION OF THE INVENTION (1) Object of the Invention [Field of Industrial Application] The present invention relates to a method for manufacturing a surface-mounted coil in which a small wire-wound coil element is packaged with an I/N and an insulating resin mold.

[Conventional technology]

FIG. 3 is a perspective view illustrating the manufacturing process of a conventional surface-mounted coil.

As shown in FIG. 3, a conventional surface mount coil using a wire-wound coil element has a coil element 1 with a wire wound around opposite sides of a rectangular frame core 2 and a lead terminal frame 3.
It was made by combining the steps described below. The lead terminal frame 3 is a strip-shaped metal plate in which punched holes are formed at regular intervals along the length direction, and as shown in the first punched hole part of the button on the left side of FIG. Part 4, bridging frame at the boundary with the adjacent punch hole 5. Two terminal plate pieces 6 facing each other are formed by punch holes. The terminal plate piece 6 is provided with a narrow barb piece 7 at its tip. This binding piece 7 is bent at a right angle at the base to form a rising part, as shown in the second punch hole from the left side in FIG. Next, as shown in the third punch hole from the left side of Figure 3, the first insulating resin mold
A box-shaped container 8 is formed, which has a recess 9 in which the coil element 1 can be accommodated, and in which the tip of a barbed piece 7 projects in an r-shape from the top surface.

The depth of the recess 9 is slightly smaller than the height of the coil element 1. After storing the coil element l in this recess 9 and connecting both ends of the winding to the binding piece 7, the box-shaped container 8 and the upper part of the coil element 1 are covered with a second insulating resin mold 10 (a third (See the fourth punch hole from the left side of the figure) Form into a rectangular parallelepiped. The terminal plate piece 6 was cut from the position indicated by the broken line in FIG. 3 to form a surface-mounted coil. FIG. 4 shows a front cross-sectional view of the surface-mounted coil thus completed.

As described above, in the conventional surface-mounted coil, the coil element 1 and the lead terminal plate piece 6 are integrally molded by two insulating resin moldings.

[Problem to be solved by the invention]

In the above-mentioned manufacturing method, since it includes the second rim resin mold, two sets of molds are required, and there are problems in that the working time is long and the material and processing costs are high. .

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides an inexpensive method for manufacturing a surface-mounted coil that can be assembled in one molding operation and in a simple operation.

Configuration of the Invention [Means for Solving the Problems] The present invention uses a coil element in which wires are wound on opposite long sides of a rectangular frame core, and the tip of the terminal plate piece of the lead terminal frame is The above-mentioned problem is solved by forming a binding piece on the part and a positioning piece having a stepped part at an intermediate height.

That is, the present invention provides a pair of terminal plate pieces protruding from both sides in a direction perpendicular to the longitudinal direction of a lead terminal frame in which punch holes are formed at regular intervals along the longitudinal direction of a band-shaped metal plate.
In a method for manufacturing a surface-mounted coil in which wire-wound coil elements are connected and covered with an insulating resin mold, the coil element has a single winding on opposite long sides of a rectangular frame-type core. The terminal plate piece has a barb piece formed at the tip rising part and a positioning piece having a stepped part at an intermediate height, and the coil element is placed on the positioning piece facing the core. A method for producing a surface mount type coil, which comprises: engaging the short sides, mounting the coil across the pair of terminal plate pieces, connecting the terminal plate to the connecting piece, and then covering the coil with an insulating resin mold. .

[Effect]

In FIG. 1, the positioning piece 13 of the terminal plate piece 11 has a stepped portion 14 and an upright portion 15 on the bottom surface of the opposing short side of the core of the coil element 1 and on the diagonal inner corner, respectively. By engaging and holding the coil element across the terminal plate piece, the coil element can be positioned and integrated by one molding process.

〔Example〕

An embodiment of the present invention will be described with reference to FIG.

FIG. 1 is a perspective view for explaining the manufacturing process of a surface-mounted coil according to the present invention. In FIG. 1, a coil element 1 has a rectangular frame core 2 with one winding on opposite long sides.

The lead terminal frame 3 is a strip-shaped metal plate in which H-shaped holes having a small width in the center are formed at regular intervals along the length of the metal plate. As shown in the first punch hole from the left side of FIG. 1, a pair of terminal plate pieces 11 having the same width extend from slightly different parts of the frame parts 4 on both sides connected by the bridging frame 5. It is formed. The distance between the side edges of the pair of terminal plate pieces 11 closer to the bridging frame 5 (indicated by WO in FIG. 1) is approximately the same as the short side length of the outer circumference of the rectangular frame core 2, and The distance between the side edges (opposing width) is shorter than the short side length of the inner circumference of the rectangular frame core 2. A cut 12 of a required length is formed at the tip of the terminal plate piece 11 toward the frame portion 4, and the interval between the cuts 12 (indicated by W in the figure) is equal to the length of the short side of the inner circumference of the core 2. The dimensions are set to be approximately the same as, or slightly smaller than. The part of the cut 12 closer to the a-crossing frame 5 is the barb piece 7, and the part on the opposite side is the positioning piece 13.

The barb piece 7 has a rectangular notch near its tip, similar to the conventional one.

Next, the tip of the terminal plate piece 11 is bent at a right angle on the frame portion 4 side from the end of the cut 12, as shown in the second punch hole from the left side in FIG. 1, and then positioned. The piece 13 is bent horizontally toward the center of the punched hole at the height of the end of the cut 12, and the free end is further erected at a right angle to form a stepped portion 14 and an upright portion 15. Upright part 15
The interval (shown in FIG. 1) is set to be approximately the same as the long side length of the inner circumference of the core 2.

Since the terminal plate piece 11 has such a shape, the first
As shown in the third punch hole from the left side of the figure, the coil element 1 is brought into contact with the bottom surface of its opposing short side against the stepped portion 14,
When placed in a bridging position, the ribs 7 of the opposing upright portions 15
The side edges engage with the diagonally inner circumferential corners of the core 2, respectively, so that the coil element 1 can be positioned and held.

After connecting the winding to the tie piece 7, as shown in the fourth punch hole from the left side of FIG. A surface-mounted coil is completed.

Figure 2 is a front cross-sectional view of the surface mount type coil made by the above manufacturing process.As can be seen from Figures 1 and 2, the coil is integrally molded in one resin molding operation. I know that there is.

C1 Effects of the Invention [Effects of the Invention] According to the present invention, the wire-wound coil element can be easily positioned and held directly on the lead terminal frame.
The coil can be packaged with two insulating resin molds, requiring only two sets of molds, reducing working time and providing an inexpensive surface-mounted coil.

[Brief explanation of drawings]

FIG. 1 is a perspective view for explaining the manufacturing process of a surface-mounted coil according to the present invention. FIG. 2 is a front sectional view showing an embodiment of a completed surface-mounted coil according to the present invention. FIG. 3 is a perspective view illustrating the manufacturing process of a conventional surface-mounted coil. FIG. 4 is a front sectional view showing a conventional example of a surface-mounted coil. 1... Coil element, 2... Rectangular frame core, 3...
Lead terminal frame, 4... Frame portion, 5... Bridging frame, 6.11... Terminal plate piece, 7... Karaoke piece, 8... Box-shaped container, 9... Recessed part, 10... Second insulating resin mold, 12... Cut, 13.
...Positioning piece, 14...Stepped part, 15...Upright part,
16...Mold resin. Figure 1

Claims (1)

[Claims] 1. A wire-wound coil element is connected to a pair of terminal plate pieces that protrude from both sides in a direction perpendicular to the longitudinal direction of a lead terminal frame in which holes are formed at regular intervals along the longitudinal direction of a strip-shaped metal plate. In the method for manufacturing a surface mount type coil which is externally covered with an insulating resin mold, the coil element has a single winding on opposite long sides of a rectangular frame core, and the terminal plate piece is , a locating piece is formed in which a barb piece is formed at the tip rising part and a step part is formed at an intermediate height, and the coil element is engaged with the opposing short side part of the core with the positioning piece. A method of manufacturing a surface mount type coil, characterized in that it is mounted on the pair of terminal plate pieces bridgingly, connected to the rib piece, and then covered with an insulating resin mold.