JP3064492B2 - Manufacturing method of surface mount type loop parts - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of manufacturing a surface-mounted wire component such as a transformer and a choke coil constituting an electronic circuit of an electronic device.

[0002]

2. Description of the Related Art Conventionally, in this type of manufacturing method of a surface mount type wire loop component, as shown in FIG.
The core 1 having a spring property is obtained by combining a bobbin with a magnetic core made of a soft magnetic material on the winding 1 formed by winding a wire around a non-magnetic resin bobbin 14 having a pin terminal 11 for connecting a terminal of the same.
Thus, the magnetic core was fixed to the bobbin 14.
Therefore, in the conventional assembling process of wire components such as transformers and coils, the winding to the bobbin, the binding and soldering of the winding terminal to the pin terminal, and the incorporation of the magnetic core into the bobbin are performed in separate processes. However, there is a problem that it is difficult to reduce the size of components because the winding is provided on the bobbin on which the pin terminals are implanted.

[0003]

SUMMARY OF THE INVENTION In order to eliminate these drawbacks, the present invention comprises a good conductive metal plate for a pin terminal connected to a substrate conductor to be a surface mount type terminal, and the metal plate is a hoop. The terminal is attached in advance to the material, and a resin bobbin with a winding is bonded to the terminal mounting position of the hoop material, the winding end is connected to the terminal by welding or soldering, and the magnetic core is attached to the winding After sealing and molding the winding and the magnetic core with the sealing molding resin, cut the terminal portion from the hoop material,
By molding and forming a surface-mounted wire component having surface-mounted terminals, the number of steps in the assembling process can be reduced and the size of the component can be reduced, and the surface-mounted wire component can be obtained.

[0004]

Means for Solving the Problems A surface mount type terminal uses a hoop material made of a good conductive material in advance, and the terminals are continuously opposed to each other inside the frame on two frames forming the hoop material. To form a comb, and form a terminal with a step to glue and fix the bobbin with the wire wound at the tip.The bobbin made of non-magnetic resin material that has been pre-wired is attached to both sides of the hoop material. A divided magnetic core with high specific resistance and high relative permeability characteristics is bonded and fixed to the terminal extending from the frame with resin, and a magnetic core is assembled into the center hole of the winding that is bonded and fixed to the end of the frame. A bobbin with an instant adhesive resin injected into the magnetic core from the resin inlet of the magnetic core on the top side while pressing the magnetic core and the terminal so that the magnetic core surface is in close contact, and the terminal and the winding are applied. And the two magnetic cores on the upper and lower sides Wear, and a rear molding resin is injected and solidified in the resin injection port than the magnetic core, the rear terminal is cut from the frame, along the magnetic core surface, folding and forming the lower surface,
Form surface mount terminals.

That is, according to the present invention, a frame-shaped terminal orthogonal to the frame and opposed to each other is formed inside a hoop-shaped parallel frame made of a good conductive material, and a terminal tip for fixing a wound bobbin is provided. A divided pot type with a stepped, coiled bobbin bonded and fixed to the end of a frame-shaped terminal, and a winding terminal connected to the terminal by soldering or welding, followed by a resin inlet on the top side A magnetic core is incorporated into the winding, an instant resin adhesive is injected from a resin injection port while the magnetic core is pressed and fixed from above and below, and the terminal, the winding, and the magnetic core are fixed, and further molded resin is formed. And solidifying it into the magnetic core through the resin injection port, cutting and separating the terminal from the frame, and bending the terminal along the outer peripheral lower surface of the magnetic core. .

[0006]

The terminal for forming the surface-mounting terminal is formed of a hoop material of a metal plate having good conductivity, and the terminal portion is formed in a comb shape so as to face inward from the frame portions at both ends, and the portion to be inserted into the magnetic core is formed in advance. After forming it with a step, a non-magnetic resin bobbin with a coil is fixed to the tip of the step-formed terminal with resin adhesive, and then the winding terminal is soldered or glued to the terminal. Insert the core of the split magnetic core into the winding center hole, inject the instant adhesive resin into the inside of the magnetic core from the resin inlet of the top magnetic core while pressing the magnetic core from above and below, The winding and the two magnetic cores are fixed, and a molding resin is injected into the magnetic core through a resin injection port. After the resin is solidified, the terminals are cut and separated from the frame portion. Therefore, it is possible to manufacture a surface-mounted wire loop component that can be automatically assembled by molding a terminal into a hoop material and using a magnetic core having a resin injection port.

[0007]

2 (a) and 2 (b) for explaining an embodiment of the present invention with reference to the drawings. FIGS. 2 (a) and 2 (b) show a hoop material 6 made of a highly conductive copper alloy plate according to the present invention. A portion of the frame 10 where the terminals 3 are to be formed is formed inside the parallel frame 10 so as to face each other at equal intervals in a comb shape, and then the tip of the terminal is formed stepwise in the shape shown in FIG. Then, a bobbin 4 provided with the winding 1 is installed on the stepped portion, and is bonded with resin. Then, as shown in FIG. 4, the divided magnetic core 2 is inserted into the center hole 16 of the winding 1 fixed to the frame-shaped terminal.
Through the center core 21 and instantaneously adhere from the resin injection port 9 on the upper surface of the magnetic core 2 while fixing the magnetic core of the Ni—Zn ferrite core having the high relative magnetic permeability characteristic shown in FIG. An agent is injected into the magnetic core, and the terminal, the winding, and the two magnetic cores are fixed with an instant adhesive.
As shown in FIG. 3C, the magnetic core 2 is provided with resin inlets 9 on both sides on the terminal lead-out side of the magnetic core 2 on the upper surface side, and then shaped from the resin inlets 9 on both sides of the upper surface of the magnetic core. Inject resin and solidify. After the shaping resin is solidified, the terminal 3 connected to the frame 10 is cut from the frame 10,
The terminal is bent along the outer peripheral surface of the magnetic core 2 to form a surface-mounting terminal, thereby obtaining a surface-mounting wire component. Although the present invention has been described with reference to an example of a transformer having four terminals with two windings, the inductor according to the present invention having one winding and one terminal at each end of the magnetic core is also described above. Naturally, it can be manufactured by a method for manufacturing a part.

[0008]

According to the present invention, the terminals are formed in such a manner that they are arranged in a frame shape at regular intervals in the form of a comb so as to face the inside of a position which is orthogonal to the frame made of a copper alloy plate and face each other. The bobbin around which the winding is wound is bonded and fixed to the end of the terminal. A magnetic core with a resin injection port on the upper surface in the form of a divided pot is assembled into the winding in the center hole of the winding, and the two magnetic cores are pressed and fixed. While injecting the instant adhesive resin from the resin injection port, fixing each part, injecting and solidifying the shaping resin from the resin injection port, cutting and separating the terminal from the frame, and laying the terminal on the surface of the magnetic core Is bent to form a surface mount terminal. The method for manufacturing a surface-mounted wire loop portion according to the present invention enables automatic assembly of a wire loop component and can provide an inexpensive wire loop component.

[Brief description of the drawings]

FIG. 1 is a side view of a surface-mounted wire loop component according to the present invention.

FIGS. 2A and 2B are diagrams in which a frame-shaped terminal of the surface-mounted wire ring component according to the present invention is formed, and a bobbin on which a winding is applied is fixed to the terminal. FIG. 2A is a plan view, and FIG. b) is a side view.

FIG. 3 is a view showing a magnetic core constituting the surface-mounted wire loop component according to the present invention, and FIG. 3 (a) is a plan view of the magnetic core on the lower surface side. FIG. 3B is a sectional view taken along line AA of FIG.
FIG. 3C is a plan view of the upper magnetic core.

4A and 4B are diagrams in which a winding fixed to a terminal of the surface-mounting wire component according to the present invention is fixed to a magnetic core, wherein FIG. 4A is a plan view of a lower surface side, and FIG. Sectional view when two cores are combined.

FIG. 5 is a perspective view of a conventional wire loop component.

[Description of Signs] 1 winding 2 magnetic core 3 terminal 4 bobbin 5 welding part 6 hoop material 7 magnetic core 8 resin material 9 resin injection port 10 frame 11 pin terminal 12 magnetic core 13 core holder 14 bobbin 15 soldering part 16 central hole 21 core

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification code FI H01F 41/12 H01F 15/10 D

Claims (1)

(57) [Claims] 1. Inside a hoop-shaped parallel frame made of a good conductive material, frame-shaped terminals orthogonal to the frame and opposed to each other are formed, and a terminal end for fixing a wound bobbin is stepped. And a wire-shaped bobbin is bonded and fixed to the end of the frame-shaped terminal, and the winding end is connected to the terminal by soldering or welding, and then a resin mold inlet is attached to the upper surface side. Into the windings, while pressing and fixing the magnetic core from the upper and lower surfaces, inject instantaneous resin adhesive from the resin injection port, fix the terminal, the winding, and the magnetic core, and further mold resin A method for producing a surface-mounted wire component, comprising: injecting a resin into a magnetic core into a magnetic core to solidify the material; cutting and separating the terminal from the frame; and bending the terminal along the outer peripheral lower surface of the magnetic core.