JP3577603B2 - Lead frame for common mode wound inductor and method for manufacturing common mode wound inductor using the same - Google Patents

Description

[0001]
[Industrial applications]
The present invention relates to a common mode wound inductor provided for surface mounting and having two inductance circuits, and in particular, a lead frame used when manufacturing a common mode wound inductor, and a common mode wound inductor using the same. A method for producing the same.
[0002]
[Prior art]
In conventional winding chip inductors, generally, a winding chip inductor having one inductance element for one component has been commercialized and used as a noise filter or the like for removing normal mode noise. A structure and a manufacturing method for realizing miniaturization and cost reduction of this normal mode winding chip inductor have been devised and invented. This manufacturing method is characterized by using a lead frame. As shown in FIG. 11, the lead frame 51 has a pair of terminals 52, 53 and connecting portions 56, 57 for connecting the two terminals 52, 53 in a plurality of strips. Is a direction obliquely intersecting with the direction in which the terminals 52 and 53 are arranged. The method of manufacturing a normal mode winding chip inductor using the obliquely connected lead frame 51 is as follows. First, a magnetic core 61 is adhered and fixed on the lead frame 51, and one connecting portion 56 of the lead frame 51 is connected. To form a comb-shaped coupling body 70, and as shown in FIG. 12, a winding 81 is applied to one magnetic core 61 of the coupling body 70, and then, at an arrangement pitch of the magnetic cores 61. By sequentially feeding the connected body 70 by one pitch, applying the winding 81 to the next magnetic core 61, and repeating such winding and the sequential feeding, the winding end of the winding 81 applied to a certain magnetic core 61 is ended. A wire 84 generated between the end 83 and the winding start end 82 of the winding 81 applied to the next magnetic core 61 is passed through the connecting portions 52c and 53c of the terminals 52 and 53, and the wire 84 and the terminal 52 are connected. , 53 Electrically connected, as shown in FIG. 13, cut the excess wire 87 at the cutting point 85 and 86, so as to remove. According to this manufacturing method, the winding process is greatly simplified, so that the time required in the winding process is significantly reduced, and the control mechanism of the flyer head of the flyer winding machine used for winding is provided. Can be simplified to two axes, a θ axis for performing fryer rotation and a Y axis for performing linear movement in the direction of the fryer rotation axis. In addition, since the step of removing the extra line 87 generated between the connecting members 70 is simplified, the productivity is greatly increased and the equipment cost is dramatically reduced.
[0003]
On the other hand, a common mode winding inductor mainly having a plurality of inductance elements in one component and mainly used as a line filter for removing common mode noise has four or more terminals 90 as shown in FIG. While holding the drum core 91 and applying the winding 92 by the winding nozzle 100, the process of cutting and cutting the winding terminal 93 to the terminal 90 is repeated several times, and each terminal 90 and each winding terminal 93 are soldered. A manufacturing method of electrically connecting by attaching or the like is employed.
[0004]
[Problems to be solved by the invention]
However, in the above-described method of manufacturing the common mode wound inductor, it takes a long time to wind the winding terminal to the terminal, it is difficult to improve the productivity, and a mechanism required to wind and cut the wire. It becomes complicated, and it is difficult to reduce the equipment cost of the winding machine. Furthermore, since it is desirable that the nozzle of the winding machine can pass between adjacent terminals for the lashing operation, the distance between the terminals is restricted and it is difficult to reduce the size of the inductor. .
[0005]
These drawbacks can be solved by applying the above-described method of manufacturing a normal mode wound inductor to a method of manufacturing a common mode wound inductor, but this has been impossible to realize due to the following problems. .
[0006]
That is, in the method of manufacturing the normal mode wound inductor, the wire 84 between the adjacent windings 81 has a shape in which the winding start 82 and the winding end 83 are simply connected, and thus, one wire is similarly formed. When a plurality of windings are applied to the magnetic core, the winding terminals pass through the same point, and it is difficult to connect each winding terminal to a separate terminal.
[0007]
Therefore, in order to be able to obtain connection points between each winding terminal and each terminal individually, means for freely setting the passing point of the wire is required.
[0008]
Therefore, an object of the present invention is to provide a lead frame for a common mode wound inductor that enables a method for manufacturing a normal mode wound inductor using a conventional lead frame to be applicable to a method for manufacturing a common mode wound inductor. Another object of the present invention is to provide a method of manufacturing a common mode wound inductor using the lead frame.
[0009]
[Means for Solving the Problems]
According to the present invention, a first side and second side of the terminals are respectively provided on the first side and second side of the magnetic core (11) (2, 3, 4, 5), the arrangement direction and obliquely of the terminal wherein the magnetic core (11) a first side of the terminals (2, 3 or 4, 5) of and the both terminals of the second side of the magnetic core (4, 5 or 2,3) respectively connecting direction crossing the a connecting portion for a plurality of sets connecting the (7), in the first side and second side of the terminal (2,3,4,5), two terminals located on a diagonal of at least one (2 A lead frame for a common mode winding inductor, wherein a hook portion is formed on each of ( 5) , (3), and (4) is obtained.
[0010]
According to the present invention, a plurality of the magnetic cores are mounted on the lead frame for the common mode winding inductor, and a fixing step of fixing the terminals to the plurality of magnetic cores, and after the fixing step, A cutting step of cutting a connection portion on one side of the lead frame to obtain a substantially comb-shaped connection body, and a first winding step of winding the plurality of magnetic cores of the connection body after the cutting step And a second winding step of winding the plurality of magnetic cores after the first winding step, wherein the first and second winding steps include: The method of manufacturing a common mode wire-wound inductor according to claim 1, wherein the terminal is passed through the hook portion.
[0011]
【Example】
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0012]
FIG. 1 is a perspective view of a lead frame for a common mode wound inductor according to one embodiment of the present invention. The lead frame 1 has terminals 2, 3, 4, 5, connecting portions 6 and 7, and connecting pieces 8.
[0013]
The terminals 2 and 3 are arranged on one side of the magnetic core 11, and the terminals 4 and 5 are arranged on the other side of the magnetic core 11 (see FIG. 2). The terminals 2 and 3 are connected to each other to form a substantially U-shaped terminal piece 9. Similarly, the terminals 4 and 5 are connected to each other to form a substantially U-shaped terminal piece 10. The terminals 2 and 4 are terminals on the first side (first inductance circuit side), and the terminals 3 and 5 are terminals on the second side (second inductance circuit side). The terminals 2, 3, 4, and 5 have locking portions 2a, 3a, 4a, and 5a for locking the magnetic core 11, respectively.
[0014]
The connecting portion 6 connects a large number of sets of the terminals 2 and 3 (terminal pieces 9) in a diagonal chain. Similarly, the connecting portion 7 connects a large number of sets of the terminals 4 and 5 (terminal pieces 10) in a diagonal chain. The connection direction of the terminals 2, 3, 4, and 5 by the connection portions 6 and 7 is the arrangement direction of the terminals 2 and 4 on the first side and the terminals 3 and 5 on the second side (with the pair of terminal pieces 9). (Equal to the arrangement direction of the terminal strips 10).
[0015]
The connecting piece 8 connects the connecting part 6 and the connecting part 7.
[0016]
The terminal 2 is formed with a substantially jaw-shaped hook portion 2b, and the terminal 5 is also formed with a substantially jaw-shaped hook portion 5b. In the case of the present embodiment, the hooks 2b and 5b are formed on the terminals 2 and 5 on one diagonal line among the lines connecting the terminals 2, 3, 4, and 5, but the other The hooks may be provided on the diagonal terminals 3 and 4 , or the hooks may be provided on all the terminals 2, 3, 4 and 5.
[0017]
FIG. 2 is a perspective view showing a fixing step in the manufacturing method according to one embodiment of the present invention, FIG. 3 is a plan view showing a first winding step in the manufacturing method shown in FIG. 2, and FIG. FIG. 5 is a perspective view showing an operation until the winding terminal is hooked on the hooking part in the first winding step. FIG. 5 is a perspective view showing the winding terminal in the first winding step shown in FIG. FIG. 6 is a perspective view showing the hooking operation, FIG. 6 is a plan view showing the joined body after the first winding step shown in FIG. 3, and FIG. 7 is a plan view showing the second winding step in the manufacturing method shown in FIG. FIG. 8 is a perspective view showing an operation until the winding terminal is hooked on the hooking part in the second winding step shown in FIG. 7, and FIG. 9 is a perspective view of the second winding step shown in FIG. FIG. 10 is a perspective view showing the operation of hooking the winding terminal to the hook portion at that time, and FIG. 10 is a plan view showing the joined body after the second winding step shown in FIG.
[0018]
A manufacturing method according to an embodiment of the present invention will be described with reference to FIGS.
[0019]
The method for manufacturing a common mode inductor using the lead frame for a common mode wound inductor according to the present embodiment includes a fixing step, a cutting step, a first winding step, and a second winding step. I have.
[0020]
In the fixing step, first, the lead frame 1 shown in FIG. 1 is prepared, and the locking portions 2a, 3a, 4a of the terminals 2, 3, 4, 5 formed on the lead frame 1 as shown in FIG. , 5a are coated with a thermosetting adhesive 12 in advance. Next, a plurality of magnetic cores 11 are sequentially placed on the terminals 2, 3, 4, and 5, and the terminals 2, 3, 4, and 5 are fixed to the magnetic cores 11 by heating.
[0021]
In the cutting step after the fixing step, one connecting portion 6 of the lead frame 1 is sequentially cut between the two magnetic cores 11, and at the same time, the connecting pieces 10 of the lead frame 1 are also sequentially cut. As a result, a substantially comb-shaped connector 20 is obtained, and the connector 20 is subjected to the next first winding step.
[0022]
In the first winding step, as shown in FIG. 3, a winding 31 is applied to the magnetic core 11 of the connecting body 20 via the fryer nozzle 30, and the winding end 33 is passed through the hook 2 b. By sequentially feeding the connecting body 20 by one pitch in the arrangement pitch of the magnetic cores 11, the wire 34 between the winding terminals 33 and 32 passes through the connection points 2 c and 4 c with the terminals 2 and 4. Yes, the winding 31 passing through the hook portion 2b and the linked body 20 are sequentially fed.
[0023]
The operation of passing the winding 31 through the hook 2b in the first winding step will be described in more detail. As shown in FIG. 4, immediately after winding, the flyer nozzle 30 is at the position shown at 30-A. Next, while rotating the flyer nozzle 30 around the θ-axis and moving it in the Y-axis direction to the position shown in 30-B, the winding terminal 33 moves from the position shown in 33-A to 33-B. It moves to the position shown and hangs on the end face of the terminal 2. From this state, as shown in FIG. 5, when the flyer nozzle 30 is moved from the position shown at 30-B to the position shown at 30-C in the same manner as the above-described operation, the winding terminal 33 becomes It moves along the side edge of the terminal 2 from the position shown in B to the position shown in 33-C, and is hooked on the hook 2b. As described above, the operation of moving the winding terminal 33 through the hook portion 2b is very simple, and the control mechanism of the flyer head of the flyer winding machine used in the winding process includes the θ-axis rotation and the Y-axis rotation. Two control mechanisms for the axial movement are sufficient and the time required for the hooking operation is also minimized.
[0024]
After the first winding step, a terminal processing step is performed. In the terminal processing step, as shown in FIG. 6, the winding terminals 33 and 32 are electrically connected to the terminals 2 and 4 at the connection points 2c and 4c, respectively, and the two windings 31 and 32 are cut at the cutting points 35 and 36, respectively. The surplus wire, that is, the extra wire 37, is cut off and removed.
[0025]
Through the above steps, one inductance circuit is formed, and then the second winding step is performed.
[0026]
In the second winding step, as shown in FIG. 7, the terminals 42 and 43 of the winding 41 of the second circuit are connected to the connection points 5c and 3c different from the terminals 32 and 33 of the winding 31 of the first circuit. In order to obtain, it is passed through the hooking portion 5b.
[0027]
The operation of causing the hook portion 5b to pass through the winding terminal 42 will be described in detail. Immediately after the winding 41 for one magnetic core 11 is completed and the connected body 20 is sequentially fed by one pitch in the arrangement pitch of the magnetic cores 11, as shown in FIG. Is located at the position shown at 40-A. Next, when the flyer nozzle 40 is moved from the position shown by 40-A to the position shown by 40-B, and further from the position shown by 40-B to the position shown by 40-C in FIG. 9, as shown in FIG. In addition, the winding terminal 42 moves from the position shown in 42-A to the position shown in 42-B, and further, as shown in FIG. 9, from the position shown in 42-B to the position shown in 42-C, It is hooked on the hook 5b. Thereafter, a winding 41 is applied, and the connecting body 20 is sequentially fed by one pitch at an arrangement pitch of the magnetic cores 11, so that the wire 44 between the winding terminals 43 and 42 is connected to the terminal 3 as shown in FIG. , 5 and 3c, 5c.
[0028]
Next, the process proceeds to a winding terminal processing step. As shown in FIG. 10, the winding terminals 42 and 43 are electrically connected to the terminals 5 and 3 at connection points 5c and 3c, respectively. , 46, the extra line 47 is cut and removed.
[0029]
Thereafter, similarly to the normal mode winding inductor, a common mode winding inductor is completed through a molding step, a cutting step of the connecting portion 7, and the like.
[0030]
【The invention's effect】
As described above, since the lead frame for a common mode wound inductor of the present invention has a hook portion, during manufacturing, the winding terminal can be passed through the hook portion provided on the terminal. In addition, it is possible to separately provide a connection portion between the winding terminal and the terminal, and the connection between the terminal and the terminal becomes easy. In addition, since the operation of passing the winding end through the jaw portion is a very simple operation, the increase in the time required for the winding process is minimized, and the above operation is performed by the flyer head of the flyer winding machine. Can be sufficiently achieved only by the rotation in the θ-axis and the movement in the Y-axis direction, so that the configuration of the flyer winding machine used in the winding process is not complicated. As a result, it is possible to introduce the method of manufacturing normal mode wound chip inductors into the method of manufacturing common mode wound inductors, and the time required for the winding process is significantly longer than the conventional method of manufacturing common mode wound inductors. And the configuration of the winding machine used in the winding process is simplified. Furthermore, in the method of manufacturing the common mode wound inductor of the present invention, the steps of winding, terminal treatment, and the like, and those of the normal mode wound chip inductor, are common to each other, and therefore, in each step of both inductors. The configuration of the production equipment is shared, and the development cost of the equipment can be reduced.
[Brief description of the drawings]
FIG. 1 is a perspective view of a lead frame for a common mode wound inductor according to one embodiment of the present invention.
FIG. 2 is a perspective view showing a fixing step in a manufacturing method according to one embodiment of the present invention.
FIG. 3 is a plan view showing a first winding step in the manufacturing method shown in FIG. 2;
FIG. 4 is a perspective view showing an operation until the winding terminal is hooked on the hooking part in the first winding step shown in FIG. 3;
FIG. 5 is a perspective view showing an operation of hooking a winding terminal on a hook portion in a first winding step shown in FIG. 3;
FIG. 6 is a plan view showing the connected body after the first winding step shown in FIG. 3;
FIG. 7 is a plan view showing a second winding step in the manufacturing method shown in FIG. 2;
FIG. 8 is a perspective view showing an operation until the winding end is hooked on the hooking part in the second winding step shown in FIG. 7;
FIG. 9 is a perspective view showing an operation of hooking a winding terminal on a hook portion in a second winding step shown in FIG. 7;
FIG. 10 is a plan view showing the connected body after the second winding step shown in FIG. 7;
FIG. 11 is a perspective view of a lead frame for a normal mode wound inductor.
FIG. 12 is a plan view showing a winding step in a method of manufacturing a normal mode wound inductor using the lead frame shown in FIG. 11;
FIG. 13 is a plan view showing a terminal processing step in the manufacturing method shown in FIG. 12;
FIG. 14 is a perspective view illustrating a method for manufacturing a conventional common mode wound inductor.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Lead frame 2 Terminal 2b Hook part 3 Terminal 4 Terminal 5 Terminal 5b Hook part 6 Connection part 7 Connection part 11 Magnetic core 20 Connection body 30 Flyer nozzle 31 Winding 40 Flyer nozzle 41 Winding

Claims (2)

A first side and second side of the terminals are respectively provided on the first side and second side of the magnetic core (11) (2, 3, 4, 5),
Both terminals (2, 3 or 4, 5) and both terminals of the second side of the magnetic core of the first side of the magnetic core by a connecting direction intersecting the arrangement direction and obliquely of the terminal (11) (4,5 Or a connecting portion (7) for connecting a plurality of sets each of 2, 3) .
Among the first side and second side of the terminal (2,3,4,5), each engaging portion is formed on the two terminals (2, 5 or 3,4) in at least one of the diagonal A lead frame for a common mode wound inductor, wherein the lead frame is formed. A fixing step of mounting a plurality of the magnetic cores on the lead frame for a common mode winding inductor according to claim 1 and fixing the terminals to the plurality of magnetic cores, respectively;
After the fixing step, a cutting step of cutting a connecting portion on one side of the lead frame to obtain a substantially comb-shaped connecting body,
A first winding step of winding the plurality of magnetic cores of the connected body after the cutting step;
After the first winding step, a second winding step of winding the plurality of magnetic cores of the coupling body,
A method of manufacturing a common mode winding inductor, wherein the first and second winding steps allow the terminal of the winding to pass through the hook portion.

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