JPH06333767A - Manufacture of common mode choke coil - Google Patents

Abstract

PURPOSE:To simplify a manufacturing process and realize the cost down of a product by inserting a prepared interconnector for a base. CONSTITUTION:A resin interconnector 11 for a base in which a plurality of resin-shaped bases 2 are connected through the connection parts 12 respectively and a coil assembled body 5 in which a core is wound by respective coils are manufactured in advance. The resin interconnector 11 for a base is inserted into a lead frame 10 where a plurality of terminal pins 18 are formed so as to form a terminal 3 for tying up by a part of the terminal pins 18. Next, the terminal for tying up is bent from a base part of the base 2 for sloping to the outside. Further, the coil assembled body 5 is loaded on each base 2 of the resin interconnector 11 for a base and a wire pulled out from the coil assembled body 5 is tied up with the terminal 3 for tying-up. Thereby, a manufacturing process can be simplified so as to lower manufacturing cost.

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 common mode choke coil used as a countermeasure for EMI (Electromagnetic Interference) in various electronic devices.

[0002]

2. Description of the Related Art FIGS. 12 to 14 are views showing conventional examples. In FIGS. 12 to 14, 1 is a common mode choke coil, 2 is a base, 3 is a terminal for peeling, and 4 is an external terminal. ,
5 is a coil assembly, 6 is a wire, 7 is a toroidal core, 8 is a connector, 9 is a gate, 10 is a lead frame, and 18 is a terminal pin.

§1: Schematic description of common mode choke coil--see FIG. 12 FIG. 12 is an explanatory view of a conventional common mode choke coil (A is a plan view of the common mode choke coil, and B is the use of the common mode choke coil). Example).

Conventionally, various types of common mode choke coils have been known as a common mode choke coil for EMI countermeasures, and one of them is shown in FIG. In this common mode choke coil 1, a coil assembly 5 is placed on a base 2 provided with a twisting terminal 3 and an external terminal 4, and a tip end of a wire 6 pulled out from the coil assembly 5 is removed. It is the one that is entangled in the lug terminal 3.

In this case, the coil assembly 5 is constituted by a toroidal coil in which a plurality of (six in this example) coils are wound around the toroidal core 7. The common mode choke coil 1 is used in the state shown in FIG. 12B, for example.

In this example, one of the six coils of the common mode choke coil 1 is connected to the GND line, and the remaining coil is connected to the gate 9 (transistor gate or the like).
It is used by connecting to each signal line between the connector and the connector 8.

§2: Description of manufacturing method of common mode choke coil ... See FIGS. 13 and 14. FIG. 13 is an explanatory view of a conventional manufacturing process, and FIG. 14 is an explanatory view 2 of a conventional manufacturing process. Hereinafter, a method of manufacturing the common mode choke coil will be described with reference to FIGS.

Step 1: First, the lead frame 10 is stamped to form a terminal pin portion. Step 2: The stamping portion is frame-cut at a substantially central portion thereof and separated into both sides, and a large number of terminal pins 18 are formed on both sides (formation portions for both ends of the barring and external terminals). .

Step 3: Bend the tip portion of the terminal pin 18 (the portion to be the twisting terminal) at a right angle. Step 4: Lead frame 10 processed in above step 3
Then, resin insert molding is performed to form the base 2.

Step 5: After completion of the insert molding,
A deburring process is performed to remove burrs generated on the base 2. Step 6: The previously assembled coil assembly 5 is mounted on the base 2 formed as described above. Then, the tip end of the wire 6 pulled out from the coil assembly 5 is twisted to the twisting terminal 3.

Step 7: A predetermined portion of the lead frame 10 is cut and separated into individual parts. Through the above steps 1 to 7, the common mode choke coil 1 configured as shown in FIG. 12 is completed.

[0012]

SUMMARY OF THE INVENTION The above-mentioned conventional devices have the following problems. That is, since the base was subjected to resin insert molding, it was necessary to perform the lead frame processing and the insert molding for forming the base on the same manufacturing line.

Therefore, the manufacturing line becomes complicated and the manufacturing process becomes long (manufacturing lead time is long). In addition, it has been a cause of increasing the cost of the product. An object of the present invention is to solve such conventional problems, simplify the manufacturing process when manufacturing a common mode choke coil, and realize product cost reduction.

[0014]

FIG. 1 is a diagram for explaining the principle of the present invention. In FIG. 1, the same parts as those in FIGS. 12 to 14 are designated by the same reference numerals. Further, 11 is a resin connecting body for the base,
Reference numeral 12 is a connecting portion, 13 is a through hole, 19 is a cover, 21 is a holding piece, and 22 is a claw.

In order to solve the above problems, the present invention has the following configuration. (A): In the common mode choke coil manufacturing method for manufacturing a common mode choke coil using a lead frame, a plurality of resin-molded bases 2 are connected to each other through a connecting portion 12, and a base resin connecting body 11 is formed.
And a coil assembly 5 in which each coil of a common mode choke coil is wound around the core in advance, and: a lead frame 10 having a plurality of terminal pins 18 formed thereon,
Insert the resin connector 11 for the base (outsert)
Then, the first step of forming the tangling terminal 3 with a part of the terminal pin 18, and: bending the tangling terminal 3 formed in the first step from the base of the base 2 to the outside. Second step of inclining: After completion of the second step, the coil assembly 5 is attached to each base 2 of the resin connecting body 11 for base.
And the wire 6 pulled out from the coil assembly 5 is twisted to the twisting terminal 3 by a third step,
It was configured to manufacture the above common mode choke coil.

(B): In the manufacturing method of the common mode choke coil of the configuration (a), the fitting claw 22 is attached to the tip end portion.
The cover 19 including a plurality of holding pieces 21 having the above is manufactured in advance, and the claw 22 of the cover can be fitted to a part (back side) of each base 2 of the base resin coupling body 11. A cover fixing concave portion is provided, and after the third step is finished, the cover 19 is covered from above the coil assembly 5 and the base 2 is located on the side surface where the above-mentioned twisting terminal 3 is not present.
Of the holding piece 21 in the cover fixing recess.
Are configured to fit together.

(C): In the manufacturing method of the common mode choke coil of the configuration (a), the base resin connector 11 is used.
A plurality of through holes 13 are formed in each base 2 in advance, and when the base resin connector 11 is inserted (outsert) into the lead frame 10 in the step 1, the plurality of through holes 13 formed in the lead frame 10 are formed. The terminal pin 18 of No. 1 was inserted into the through hole 13 of each base 2.

[0018]

The operation of the present invention based on the above configuration will be described with reference to FIG. (1): First, the lead frame 10 is processed (see FIG. 1B).
(See FIG. 1C).

(2): Then, on the lead frame 10,
The pre-manufactured base resin connector 11 (see FIG. 1A) is inserted and assembled. In this case, the terminal pin 18 formed on the lead frame 10 is inserted into the through hole 13 of the base, and the base 2 is incorporated into the lead frame 10 (see FIG. 1D).

The tip portion of the terminal pin 18 that is exposed to the outside (front side of the base 2) through the through hole 13 is used as the tangling terminal 3, and the tangling terminal 3 extends outward from the base portion. Bend and tilt (see FIG. 1D).

(3): Next, the coil assembly 5 is mounted and positioned on each base 2 (see FIG. 1E), and the tip portion of the wire 6 pulled out from the coil assembly 5 is attached to the entanglement terminal 3 Squeeze.

(4) After that, the cover 19 is put on the base 2 on which the coil assembly 5 is mounted, and the cover 1
The base is sandwiched and fixed by the sandwiching piece 21 provided on 9 (see FIG. 1F).

In this case, the claw 22 provided at the tip of the holding piece 21 is fitted and fixed in the cover fixing recess of the base 2. (5): Finally, a frame is cut at a predetermined position to make an individual part.

The common mode choke coil is manufactured as described above. In this case, the resin connecting body for the base, which is manufactured in advance, is used and is inserted into the lead frame by outsert.

Therefore, the manufacturing process of the common mode choke coil can be simplified and the cost of the product can be reduced.

[0026]

Embodiments of the present invention will be described below with reference to the drawings. 2 to 11 are views showing an embodiment of the present invention. In FIGS. 2 to 11, the same components as those in FIGS. 1 and 12 to 14 are designated by the same reference numerals. Further, 14 is a positioning concave portion, 15 is a guide pin, 16 is a tapered portion, 17 is a cover fixing concave portion, and 20 is a cutout portion.

When manufacturing the common mode choke coil, the coil assembly, the base resin connecting body, the cover and the like are manufactured in advance (separately manufactured). After that, the lead frame is processed, and the above-mentioned base resin coupling body, the coil assembly and the cover are assembled to manufacture a common mode choke coil.

First, the coil assembly, the base resin connector, and the cover used for manufacturing the common mode choke coil will be described. §1: Description of coil assembly--see FIG. 2A FIG. 2A is a plan view of the coil assembly. As shown in the figure, the coil assembly 5 is formed by winding a wire 6 around a toroidal core 7 to form a plurality of coils (six coils as in the conventional example are formed).

Since each coil is connected to a terminal,
The tip portion of the wire 6 is pulled out by a predetermined length. §2: Description of base resin connection body ... FIGS. 2B and 3
Refer to FIG. 4. FIG. 2B is a plan view of the base resin connection body, FIG. 3 is an enlarged view of the base resin connection body (a plan view of the front side), and FIG. 4 is an enlarged view of the base resin connection body (a back side plan view). Is.

The base resin connecting body 11 is formed by connecting a large number of resin molded bodies to be the base 2 via the connecting portions 12, respectively, and is manufactured by resin integral molding (see FIG. 2B). Front side of each base 2 of the resin coupling body 11 (see FIG. 3).
), A positioning recess 14 for mounting and positioning the coil assembly 5 is provided, and a guide pin 15 (when the wire is entangled with the entanglement terminal) is provided in the peripheral portion thereof. (4 in the example) are integrally provided.

Further, a large number of through holes 13 for inserting terminal pins of the lead frame are provided at both ends of the base resin connector 11. On the back side (see FIG. 4) of the base resin connecting body 11, there are provided cover fixing recesses 17 (four in this example) for fitting and fixing claws (described later) of the cover.

Further, a large number of through holes 13 are provided on the back side (through the front side), and in order to facilitate insertion of the terminal pins of the lead frame around the through holes 13, A taper portion 16 is provided.

§3: Description of cover ... See FIG. 5 FIG. 5A is a plan view of the cover, FIG. 5B is a side view in the X direction, and FIG. 5C is a side view in the Y direction.

The cover 19 is a molded body of resin which is placed on the base 2 on which the coil assembly 5 is mounted and fixed to the base, and holding pieces 21 for fixing to the base are provided at the four corners. It is provided.

A claw 22 that fits into the cover fixing recess 17 of the base is provided at the tip of the holding piece 21. Further, notches 20 for avoiding the guide pins 15 of the base 2 are provided at four corners of the cover 19.

§4: Description of manufacturing process of common mode choke coil ... See FIGS. 6 to 8. FIG. 6 is a manufacturing process explanatory diagram 1, FIG. 7 is a manufacturing process explanatory diagram 2, and FIG. 8 is a manufacturing process explanatory diagram 3. Is.

Hereinafter, a method of manufacturing the above common mode choke coil will be described based on the manufacturing steps shown in FIGS. 6 to 8 are explanatory views of the manufacturing process, the overall view is not shown, but in reality, many common mode choke coils are manufactured at the same time.

Step 1: First, the lead frame 10 is stamped to form a portion to be a terminal pin. Step 2: The stamping portion is frame-cut at a substantially central portion thereof and separated into both sides, and a large number of terminal pins 18 are formed on both sides (formation portions for both ends of the barring and external terminals). .

Step 3: By bending the frame, the tip portion of the terminal pin 18 (the portion to be the twisting terminal) is bent at a right angle. Step 4: The pre-manufactured base resin connector 11 is mounted and incorporated in the lead frame 10 processed in the step 3. In this case, the tips of the terminal pins 18 formed on the lead frame 10 are inserted into the through holes 13 of the base, and the base 2 is incorporated into the lead frame 10.

The tip portion of the terminal pin 18 that is exposed to the outside (front side of the base 2) after passing through the through hole 13 is used as the binding terminal 3. Step 5: The tangling terminal 3 is bent outward from the base portion and tilted.

Step 6: The prefabricated coil assembly 5 is mounted and positioned in the positioning recess 14 of each base 2 of the base resin connector 11. afterwards,
The tip of the wire 6 pulled out from the coil assembly 5 is twisted to the twisting terminal 3.

Step 7: A cover 19 is put on the base 2 on which the coil assembly 5 is mounted, and the holding piece 21 provided on the cover 19 holds and fixes the base 2. In this case, the claw 22 provided at the tip of the sandwiching piece 21 is fitted and fixed in the cover fixing recess 17 provided on the back side of the base 2.

Step 8: The frame is cut at a predetermined position (the cutting position shown in Step 7) to form the external terminal 4. Step 9: The connecting portion 12 is cut into individual parts (common mode choke coils).

By the above steps 1 to 9, SMD
It is possible to obtain a common mode choke coil that has been made into a surface mount component. §5: Detailed description of each manufacturing step ... See FIGS. 9 to 10. FIG. 9A is an explanatory diagram of step 4, FIG. 9B is an explanatory diagram 1 of step 5,
10 is an explanatory diagram 2 of step 5, and FIG. 11 is an explanatory diagram of step 6 (A is a plan view of the semi-finished product, B is a side view in the Y direction, and C is a side view in the X direction). Hereinafter, for each of the above manufacturing steps,
Further details will be described.

Description of Step 4 ... See FIG. 9A In Step 4, the prefabricated base resin connector 11 is mounted on the lead frame 1 and incorporated. In this case, the base resin connector 11 is mounted with the back side of the base 2 (see FIG. 4) as the lead frame 10 side.

Then, the tip portions of the terminal pins 18 formed on the lead frame are inserted (press-fitted) into the through holes 13 from the back side of the base 2 to integrate the lead frame 10 and the base resin connection body 11 ( Integration by outsert).

In this manner, the tip end portion of the terminal pin 18 that is exposed to the outside (front side of the base 2) after passing through the through hole 13 is used as the binding terminal 3. : Description of Step 5 ... See FIGS. 9B and 10 In this step, after the completion of Step 4, the twisting terminal 3 is bent outward and inclined. In this case, all the tangling terminals 3 are bent from the base portion and inclined outward in the direction of the arrow in FIG. 9B.

FIG. 10 shows a state in which the entanglement terminal 3 is inclined in this way. Note that FIG. 10 is illustrated as a perspective view (single item) when the frame is cut. Inclining the tangling terminal 3 improves workability when tangling the wire 6 drawn from the coil assembly,
In addition, it is for improving the state after being twisted. That is, the wire can be easily entangled at the base of the entanglement terminal.

Description of Step 6 ... See FIG. 11 In this step, the coil assembly 5 is mounted and positioned in the positioning recess 14 provided in each base 2 of the base resin connector 11. Then, the tip portion of the wire 6 pulled out from the coil assembly 5 is twisted to the twisting terminal 3.

The semi-finished product in this state is shown in FIG. Note that FIG. 11 is illustrated as one frame-cut semi-finished product (single product). As shown, in this example,
Since 6 coils are wound around the coil assembly 5,
There are 12 wires 6 drawn from both ends of the coil. Therefore, the tips of the 12 wires 6 are respectively
Twist to the tangle terminal 3.

(Other Embodiments) The embodiments have been described above, but the present invention can be implemented as follows. : It can be implemented without a cover. In this case, the above step 7 (see FIGS. 7 and 8) is unnecessary.

The number of bases constituting the base resin-bonded body may be any number in consideration of workability and the like. : The through hole provided in the base can be implemented even in the groove provided in the side surface of the base (if the terminal pin can be inserted, it can be implemented).

[0053]

As described above, the present invention has the following effects. : Since the resin connector for base is manufactured in advance and the resin connector for base is inserted into the lead frame by the outsert, the manufacturing process can be simplified. As a result, it is possible to reduce the cost of the product.

For example, the above-mentioned base resin coupling body is
It is manufactured in advance at another factory specializing in resin molding, and the manufacturing process (assembly process) of the above common mode choke coil is performed.
Then, since the lead frame is processed and the resin connecting body for the base is incorporated by outsert, it is possible to easily manufacture.

In the conventional manufacturing process, insert molding of resin was performed, so that deburring work was required after resin molding. However, in the present invention, since the resin connector for the base is incorporated by outsert,
No burr occurs. Therefore, the deburring work is unnecessary, the plating is not peeled off from the terminal plated portion, and the semi-attachability is improved.

[Brief description of drawings]

FIG. 1 is a diagram illustrating the principle of the present invention.

FIG. 2A is a plan view of a coil assembly, and B is a plan view of a base resin connection body.

FIG. 3 is an enlarged view of a resin assembly for a base (a plan view of the front side).
Is.

FIG. 4 is an enlarged view of a resin connection body for a base (a plan view of the back side).
Is.

FIG. 5A is a plan view of the cover, B is a side view in the X direction, and C.
Is a side view in the Y direction.

FIG. 6 is a manufacturing process explanatory diagram 1.

FIG. 7 is a manufacturing process explanatory diagram 2.

FIG. 8 is a manufacturing process explanatory diagram 3.

9A is an explanatory diagram of step 4, and B is an explanatory diagram 1 of step 5. FIG.

FIG. 10 is an explanatory diagram 2 of step 5.

FIG. 11 is an explanatory view of step 6 (A is a plan view of the semi-finished product, B is a side view in the Y direction, and C is a side view in the X direction).

FIG. 12 is an explanatory diagram of a conventional common mode choke coil (A is a plan view of the common mode choke coil, and B is a usage example of the common mode choke coil).

FIG. 13 is an explanatory diagram 1 of a conventional manufacturing process.

FIG. 14 is an explanatory diagram 2 of a conventional manufacturing process.

[Explanation of symbols]

 2 Base 3 Barbing Terminal 5 Coil Assembly 10 Lead Frame 11 Base Resin Connector 12 Connector 13 Through Hole 18 Terminal Pin 19 Cover 21 Clamping Piece 22 Claw

Claims (3)

[Claims] 1. A method of manufacturing a common mode choke coil, which uses a lead frame to manufacture a common mode choke coil, wherein a resin-molded base (2) is connected to a connecting portion (12).
Resin connection body for base (11) connected in plural via
And a coil assembly (5) in which each coil of a common mode choke coil is wound around the core in advance, and: a lead frame (10) having a plurality of terminal pins (18) formed thereon, The first step of inserting (outserting) the resin connecting body (11) and forming the tangling terminal (3) with a part of the terminal pin (18): Since it is formed in the first step The second bending terminal (3) is bent from the base of the base (2) and is inclined outward.
Step: After completion of the second step, the coil assembly (5) is mounted on each base (2) of the base resin connector (11), and the wire is pulled out from the coil assembly (5). A method of manufacturing a common mode choke coil, which comprises manufacturing the common mode choke coil by the third step of twisting (6) to the twisting terminal (3). 2. A cover (19) having a plurality of sandwiching pieces (21) having fitting claws (22) at its tip is manufactured in advance and the base resin connector (11) is A cover fixing recess (17) into which the cover claw (22) can be fitted is provided in a part (back side) of each base (2), and after the third step is finished, the coil assembly (5) is formed. ) Is covered with a cover (19), and the claw of the holding piece (21) is inserted into the cover fixing recess (17) on the surface of the base (2) located on the side surface without the tangling terminal (3). The method for manufacturing a common mode choke coil according to claim 1, wherein (22) is fitted. 3. A plurality of through holes (13) are formed in advance in each base (2) of the resin joint body for base (11), and in the step 1, the resin for base is attached to the lead frame (10). When inserting (outserting) the connector (11), the plurality of terminal pins (1) formed on the lead frame (10)
8. The method for manufacturing a common mode choke coil according to claim 1, wherein 8) is inserted into the through hole (13) of each base (2).