JP2004031758A - Manufacturing method of winding type chip inductor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a manufacturing method of a winding type chip inductor which hardly rolls and is easily fixed in packaging to a printed circuit board and in reflow. <P>SOLUTION: A connector portion of a winding type chip inductor 1, wherein an insulating coating wire 3 is wound closely on an outer circumference of a magnetic core 2 and both end parts are connector portions 4 without being subjected to insulation coating, is soldered. A heater chip 6, which generates a high temperature instantaneously by passing a pulse current through, is brought into contact with the soldered connector portion and the connector portions are firmly fixed by welding the soldered part of the connector portion. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a small-sized wound chip inductor mounted on a printed circuit board, and more particularly to a wound-type chip inductor capable of securely and stably fixing a conductive wire without peeling during mounting or reflow.
[0002]
[Prior art]
Conventionally, as a small-sized wound chip inductor mounted on a printed circuit board, as shown in FIG. 3, a thin conductive wire insulated and coated on the outer periphery of a rod-shaped magnetic core 21 such as a cylinder or a prism is used. There is a wound-type chip inductor 20 which is wound in close contact with each other so as to come into contact with each other, and the insulating coating on both ends of the insulating-coated conductor 22 is peeled off in advance to form a terminal portion 23. The wire-wound chip inductor 20 is characterized in that it can be used in a high frequency band, has a small parasitic component, can flow a large current with low resistance.
[0003]
[Problems to be solved by the invention]
However, in such a wound chip inductor, the connection terminal portions at both ends of the winding remain in a wound state, and the adjacent connection terminal portions are not particularly fixed. Therefore, when placed in a high-temperature environment such as reflow, springback occurs due to the tension of the winding, and both end portions float up from the magnetic core 21 or come into contact with the work at the time of mounting on the printed circuit board, and the connection terminal is contacted. There is a possibility that the portion may be peeled off from the end of the magnetic core.
[0004]
Accordingly, an object of the present invention is to provide a wire-wound chip inductor in which a conductive wire is securely and stably fixed without peeling even in a high-temperature environment such as reflow or at the time of mounting on a printed circuit board.
[0005]
[Means for Solving the Problems]
In order to achieve the above object, a method of manufacturing a wound type chip inductor according to the present invention is a method of manufacturing a wound type chip in which an insulated wire is wound around an outer periphery of a magnetic core in a tightly contacted state and both end portions are used as connection terminals without being insulated. A method of soldering a connection terminal portion of an inductor, and melting a solder-raised portion of the connection terminal portion by heating means and welding between adjacent connection terminal portions to the soldered connection terminal portion. It is.
[0006]
Further, the heating means is a heating means which instantaneously generates a high temperature by passing a pulse current.
[0007]
Further, the heating means is arranged in a direction parallel to the magnetic core, and heat-welds the connection terminal portions at both ends of the wound-type chip inductor obtained by soldering at the same time.
[0008]
Further, the heating means is arranged coaxially with the magnetic core, and heat-welds a plurality of portions of one of the connection terminal portions formed by soldering simultaneously.
[0009]
BEST MODE FOR CARRYING OUT THE INVENTION
FIG. 1 shows a first embodiment of a method of manufacturing a wound type chip inductor according to the present invention. A wound type chip inductor 1 has a prismatic ferrite having a diameter of 0.6 mm and a length of 1.7 mm. An insulated conductor 3 having a wire diameter of about 0.11 mm is wound in close contact with the outer periphery of a magnetic core 2 made of steel. At two end portions of the insulated wire 3, the insulated coating is peeled off by about 2 to 3 turns in advance and soldered to form a connection terminal portion 4. At this stage, although the connection terminal portion 4 of the wound-type chip inductor 1 is in close contact, the conductor may be peeled off from its end when a force is applied or heated.
[0010]
The wound type chip inductor 1 is attached to the welding device 5 shown in FIG. 1, and a heater chip 6 having an action of instantaneously generating a high temperature by passing a pulse current is vertically movable over the winding type chip inductor 1. It is arranged in a direction parallel to the chip inductor 1. The heater chip 6 is lowered, and the heated portion 6a is brought into contact with about two conductors of the connection terminal portion 4 at both ends of the wound chip inductor 1. Next, by instantaneously generating a high temperature through a pulse current in the heater chip 6, the solder of the connection terminal portion 4 with which the heating portion 6 a of the heater chip 6 is in contact is melted, and the adjacent conductive wires are connected by solder. By welding and immediately cooling the heater chip 6, the connection terminal portions 4 at both ends are securely fixed at one time. In addition, if it is considered that a reliable welding state would be insufficient if only one connection terminal portion 4 is welded, the welding operation is repeated by rotating the wound chip inductor 1 to weld a plurality of locations. It is a good thing.
[0011]
FIG. 2 shows a second embodiment of the method of manufacturing a wound type chip inductor according to the present invention, in which an insulated wire 3 is wound in close contact with the outer periphery of a magnetic core 2, and both ends thereof are insulated in advance. The basic configuration of the wound type chip inductor 1 in which the coating is peeled off by about 2 to 3 turns and soldered to form the connection terminal portion 4 is the same as that of the first embodiment described above, and was set in the welding device 7. A heater chip 8 that instantaneously generates a high temperature by passing a pulse current is opposed to the one end of the wound type chip inductor 1 in a coaxial direction so that the heater chip 8 can move left and right. The chip inductor 1 has a structure in which it is in contact with one connection terminal portion 4 at two places.
[0012]
Then, a high temperature is instantaneously generated in the heater chip 8 through a pulse current to melt the solder of the connection terminal portion 4 with which the heating portion 8a of the heater chip 8 is in contact, and weld the adjacent conductive wires together by soldering. When the heater chip 8 cools down immediately, the one connection terminal portion 4 is securely fixed. Next, the winding type chip inductor 1 is set to the welding device 7 with the left and right inverted, and the heater chip 8 is brought into contact with the other opposite connection terminal portion 4 as described above, and a pulse current is passed through the heater chip 6. Instantaneously generates a high temperature, melts the solder of the connection terminal portion 4 with which the heating portion 8a of the heater chip 8 is in contact, welds adjacent conductors by solder, and immediately cools the heater chip 6. Thus, the other connection terminal portion 4 is also securely fixed.
[0013]
In the above-described wound type chip inductors of the respective embodiments, the case where one heater chip is brought into contact with and welded to two portions of the connection terminal portion of the wound type chip inductor has been described. Instead, two or more heater chips may be used, or one heater chip may contact a plurality of three or more connection terminal portions.
[0014]
【The invention's effect】
As described in detail above, according to the method for manufacturing a wound type chip inductor of the present invention, a winding type in which an insulating coated conductor is wound in close contact with the outer periphery of a magnetic core, and both end portions serve as connection terminal portions without insulating coating. The connection terminal portion of the chip inductor is soldered, and the soldered connection terminal portion is melted by a heating means to the soldered connection terminal portion and the adjacent connection terminal portions are welded to each other to form a winding type. The connection terminals at both ends of the chip inductor can be securely fixed, so that the connection terminals can be reliably and stably wound without peeling even in a high temperature environment such as reflow or when mounting on a printed circuit board. The die chip inductor is fixed to a substrate or the like.
[0015]
Further, the heating means is a heating means that generates a high temperature instantaneously by passing a pulse current, so that only the solder-raised portion of the connection terminal portion can be spot-heated for a very short time, thereby welding. Welding can be performed very easily without heating unnecessary parts to a high temperature and without cooling the heated parts.
[Brief description of the drawings]
FIG. 1 is an explanatory view showing a first embodiment of a method of manufacturing a wound type chip inductor according to the present invention.
FIG. 2 is an explanatory view showing a second embodiment of the method of manufacturing a wound chip inductor of the present invention.
FIG. 3 is a front view of a conventional wound type chip inductor.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Winding type chip inductor 2 Magnetic core 3 Insulated covering wire 4 Connection terminal part 5 Welding device 6 Heater chip 6a Heating part 7 Welding device 8 Heater chip 8a Heating part

Claims (4)

An insulated conductor is wound around the outer periphery of the magnetic core in a tightly contacted state, and both ends are soldered to the connection terminal portion of the wire-wound chip inductor, which serves as a connection terminal portion without being insulated, and the soldered connection terminal portion is formed. In contrast, a method for manufacturing a wire-wound chip inductor, characterized in that a soldering portion of the connection terminal portion is melted by a heating means and the adjacent connection terminal portion is welded. 2. The method according to claim 1, wherein the heating means generates a high temperature instantaneously by passing a pulse current. 2. The winding type chip inductor according to claim 1, wherein the heating means is disposed in a direction parallel to the magnetic material core, and heats and welds connection terminal portions at both ends of the winding type chip inductor formed by soldering at the same time. Production method. 2. The method for manufacturing a wire-wound chip inductor according to claim 1, wherein the heating means is arranged coaxially with the magnetic core, and heat-welds a plurality of portions of one of the connection terminals formed by soldering simultaneously.

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