JPH0855731A - Coil parts - Google Patents

Abstract

PURPOSE:To effectively utilize the winding area of a bobbin and, at the same time, to obtain coil parts which can be reduced in height and size. CONSTITUTION:A bobbin 2 is composed of a pedestal section 3 and barrel section 4. Lead-out terminals 10 and 11 are provided to the pedestal section 3 by insert molding, etc. The terminal 10 has an extended section 10a formed in the pedestal section 3 and part of the extended section 10a is exposed at the adjacent part of the barrel section 4. The starting end section of a wire 14 wound around the barrel section 4 is press-contacted with and electrically connected and fixed to the extended section 10a by soldering, etc.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to coil parts, and more particularly to coil parts used as transformers, choke coils, filters and the like.

[0002]

2. Description of the Related Art FIG. 12 shows a conventional coil component.
The structure shown in is known. This coil component is
The bobbin 121, the primary side wire 130, the secondary side wire 131, the core 135, the primary side lead terminal 137, and the secondary side lead terminal 138. The bobbin 121 includes a pedestal portion 122 provided with the lead-out terminals 137 and 138, a body portion 124 provided on the pedestal portion 122, and a collar portion 125 provided at an end of the body portion 124. The wire rods 130 and 131 are wound around the body portion 124, and the core 135 is attached with the leg portions 136 of the core 135 inserted through the body portion 124.

By the way, in the coil component having this structure, the wire rods 130 and 131 are wound around the body portion 124 in the procedure described below. First, the starting end portion 130a of the primary wire 130
After being entangled with the primary side lead terminal 137, the wire rod 130 is wound around the body portion 124. Next, the terminal end portion 130b of the primary-side wire 130 is twisted to another primary-side lead terminal 137 (not shown). Similarly, the starting end portion 13 of the secondary wire 131
After the 1a is twisted to the secondary side lead terminal 138, the secondary side wire 131 is wound on the wound primary side wire 130.
Next, the terminal end portion 131b of the secondary wire 131 is bent to another secondary lead terminal 138 (not shown).

In this case, the primary side and secondary side wire rods 130 and 131 wound around the body portion 124 have starting end portions 130a and 1
31a reduces the winding area of the body portion 124 by the wire diameter. Further, the end portion 1 of the primary side wire rod 130
As shown in FIG. 12, 30b is often slanted outward, and a relatively large gap 128 may be formed between the wire 30b and the secondary wire 131. For this reason,
Due to the necessity to secure the winding region, measures such as increasing the axial length of the body portion 124 and widening the width of the pedestal portion 122 have been adopted. As a result, it has been a hindrance to the reduction in height and size of the coil component.

Also in terms of productivity, the wire rods 130, 1
31, the start end portions 130a and 131a and the end portion 130b,
After the 131b is entangled with the lead terminals 137 and 138, it is electrically connected and fixed by means such as soldering, so that the mechanism of the automatic winding machine for automatically performing the terminal treatment of the wire becomes complicated, This caused an increase in the size of production equipment and an increase in costs.

Therefore, an object of the present invention is to provide a coil component which can effectively utilize the winding region of the bobbin and which can be reduced in height and downsized.

[0007]

In order to solve the above problems, a coil component according to the present invention comprises (a) a pedestal portion and a bobbin including a body portion provided on the pedestal portion, and (b)
A wire wound around the body; and (c) at least two lead terminals provided on the pedestal, and (d) at least one lead terminal at a portion of the bobbin surface in contact with the wire. The extending portion is exposed, and the end portion of the wire is connected to the extending portion.

With the above structure, the end of the wire is connected to the extension of the lead-out terminal exposed at the portion where the bobbin contacts the wire, so that the winding area of the bobbin is effectively utilized.
Further, when the extending portion of at least one lead terminal is exposed to the inside of the outer periphery of the wire rod and the starting end portion of the wire rod is connected to this extending portion, the wiring distance of the starting end portion is reduced, The line area is occupied less.

Further, the coil component according to the present invention comprises a first wire rod wound around the body of the bobbin and a second wire rod wound further outside the first wire rod, and the second wire rod is provided. The extension part of at least one lead terminal is exposed to the inside of the outer periphery of the wire, and the end part of the first wire is connected to this extension part so that the end part of the first wire is obliquely pulled outward. There is no turning, and there is no gap between the second wire and the second wire.

[0010]

Embodiments of the coil component according to the present invention will be described below with reference to the accompanying drawings. [First Embodiment, FIGS. 1 to 5] As shown in FIG. 1, a coil component 1 is composed of a bobbin 2, a wire rod 14, lead terminals 10 and 11, and cores 15 and 16. Bobbin 2 is shown in FIG.
As shown in FIG. 3, it comprises a pedestal portion 3 and a body portion 4 provided at the center of the upper surface of the pedestal portion 3. The bobbin 2 has a base 3 and a body 4.
Has a hole 5 penetrating therethrough.
6c is inserted. The tip of the body 4 having a rectangular cross section is an open end surface.

The rectangular pedestal portion 3 has lead-out terminals 10 and 11 formed by punching a metal plate on one side surface on the front side.
Are provided by means such as insert molding.
The lead-out terminal 10 is provided with an extension portion 10 arranged inside the pedestal portion 3.
a, and a part of the extending portion 10a is exposed in a recess 6 provided in the upper surface of the pedestal portion 3 adjacent to the body portion 4. Recess 6
Is provided in a portion where the bobbin 2 and the wire 14 are in contact with each other.
Similarly, the lead-out terminal 11 has an extending portion 11 a disposed inside the pedestal portion 3, and a part of the extending portion 11 a is exposed in a recessed portion 7 provided at the upper edge of the pedestal portion 3. . Further, the outer leg portions 16a, 16b of the core 16 are provided on the other two side surfaces of the pedestal portion 3.
Notches 3a and 3b for avoiding the above are respectively provided.

The wire 14 is wound around the body 4 of the bobbin 2. As the wire rod 14, a polyurethane-coated copper wire or the like is used. The winding procedure of the wire 14 will be described below with reference to FIGS. 3 and 4. First, the starting end portion 14a of the wire 14 is electrically connected to the extending portion 10a of the lead-out terminal 10 exposed from the recess 6 by means of pressure bonding, ultrasonic welding, soldering, or the like.
Fix it. The solder 18 is used in the first embodiment.

Next, the wire 14 is wound around the body 4. In this case, since the routing distance of the starting end portion 14a is short, the problem that the winding area is reduced by the starting end portion 14a is eliminated. Therefore, almost the entire winding region can be utilized without waste, and the height and size can be reduced as compared with the conventional coil component. Further, if the size is the same as that of the conventional coil component, the diameter of the wire rod 14 can be increased, and the copper loss of the coil component can be reduced.

Next, the end portion 14b of the wire 14 is formed into the recess 7
The extension portion 11a of the lead-out terminal 11 exposed from the above is electrically connected and fixed by means such as crimping, ultrasonic welding, and soldering. Alternatively, after the end portion 14b of the wire 14 is entangled with the lead-out terminal 11, it may be electrically connected and fixed by means such as soldering. In this case, the extension portion 11 of the lead terminal 11
It is not necessary to expose a from the recess 7.

I-shaped section core 15 and E-shaped section core 16
Is made of a magnetic material such as ferrite. Core 1
The middle leg portion 16 c of the bobbin 6 is inserted into the hole 5 of the bobbin 2. The cores 15 and 16 are fixed to each other with an insulating tape or the like in a state of being butted. In the coil component 1 thus obtained, the starting end portion 14a and the terminating end portion 14b of the wire rod 14 are fixed to the extending portions 10a and 11a exposed on the upper surface of the pedestal portion 3, so that the conventional twisting operation can be omitted, and the automatic winding operation can be performed. The mechanism of the wire machine can be simplified.
As a result, it is possible to reduce the size of production equipment and improve the productivity of coil components.

Further, in the conventional coil component, when a wire having a small diameter is used, the start end and the end of the lead terminal may be broken due to thermal stress during soldering. However, the coil component 1 is
The start end portion 14a and the end portion 14b are connected to the lead terminals 10, 11
Since the structure is not entangled, the problem of disconnection is solved.

Further, FIG. 5 is a schematic structural view of the coil component 1, but as shown in FIG.
The insulation distance between the starting end portion 14a side portion and the terminating end portion 14b side portion of the wire 14 is long. Therefore, it is possible to use a wire rod 14 having a thinner insulating coating film than the conventional one. This is because the conventional coil component has a short insulation distance between the starting end side portion and the terminating end side portion of the wire and it is necessary to thicken the insulating coating film of the wire to secure a high breakdown voltage.

Further, in the conventional coil component, in order to increase the insulation distance between the starting end side portion and the terminating end side portion of the wire rod, a notch is provided in the pedestal portion, and the starting end portion is formed on the back surface of the pedestal portion. It is known to have a drawn structure, but in this case, there is a problem in that the starting end part is drawn around for a long distance in a free state, and the starting end part is easily broken. However, since the coil component 1 has a short wiring length at the start end, there is no possibility of causing such a problem.

[Second Embodiment, FIG. 6] As shown in FIG.
The coil component 21 functioning as a transformer includes a bobbin 22, a primary side wire member 33, a secondary side wire member 34, and lead terminals 30 and 3.
1, 32 and a core (not shown). The bobbin 22 includes a pedestal portion 23 and a body portion 24 provided in a central portion of the upper surface of the pedestal portion 23. The bobbin 22 has a hole 25 penetrating the pedestal portion 23 and the body portion 24, and the core is inserted into the hole 25.

Lead-out terminals 30, 31, 32 are provided on the left side surface of the rectangular pedestal 23 by means such as insert molding. The lead-out terminal 30 has an extending portion 30 a disposed inside the pedestal portion 23, and a part of the extending portion 30 a is adjacent to the body portion 24 and is a recessed portion 26 provided on the upper surface of the pedestal portion 23.
Is exposed to. The recess 26 is provided at a portion where the bobbin 22 and the wire member 33 are in contact with each other. Drawer terminal 31 is pedestal 2
3 has an extending portion 31a disposed inside, and the extending portion 31a
Is part of the pedestal portion 23 at the outermost layer winding position of the primary side wire 33.
It is exposed in the recess 27 provided on the upper surface. Further, the lead-out terminal 32 is provided with the extension portion 32 disposed inside the pedestal portion 23.
a, and a part of the extending portion 32a is exposed in the concave portion 28 provided in the upper surface edge portion of the pedestal portion 23.

The primary and secondary wires 33, 34 are wound around the body 24 of the bobbin 22. The procedure for winding the wires 33 and 34 will be described below. The starting end portion 33 of the primary wire 33
The extended portion 30 of the lead-out terminal 30 in which a is exposed from the recess 26
After being electrically connected and fixed to a, the primary side wire 33 is wound around the body 24. Next, the end portion 33b of the primary wire 33
And the starting end portion 34a of the secondary wire 34 is electrically connected and fixed to the extending portion 31a of the lead terminal 31 exposed from the recess 27. Next, the secondary wire 34 is wound and the primary wire 3 is wound.
After winding on the surface of No. 3, the end portion 34b of the secondary wire 34
The extension part 32 of the lead-out terminal 32 exposed from the recess 28.
It is electrically connected and fixed to a.

The coil component 21 thus obtained has the same effect as that of the coil component 1 of the first embodiment, and the end portion 33a of the primary side wire 33 is slanted outward. Is eliminated, the primary side wire rods 33 and 2
No gap is formed between the secondary wire 34 and the secondary wire 34. Therefore,
As compared with the conventional coil component, the winding area can be used without waste, and the height and size can be further reduced.

[Third Embodiment, FIG. 7] As shown in FIG.
The coil component 41 functioning as a transformer includes a bobbin 42, a primary-side wire rod 53, a secondary-side wire rod 54, and lead-out terminals 50, 5
1, 52 and a core (not shown). The bobbin 42 includes a pedestal portion 43 and a body portion 44 provided at the center of the upper surface of the pedestal portion 43. The bobbin 42 has a hole 45 penetrating the pedestal portion 43 and the body portion 44, and the core is inserted into the hole 45.

Lead-out terminals 50, 51 and 52 are provided on the left side surface of the rectangular pedestal 43 by means such as insert molding. The lead-out terminal 50 has an extending portion 50 a disposed inside the pedestal portion 43, and a part of the extending portion 50 a is adjacent to the body portion 44 and is a recess 46 provided on the upper surface of the pedestal portion 43.
Is exposed to. The lead-out terminal 51 has an extending portion 51 a disposed inside the pedestal portion 43, and a portion of the extending portion 51 a is adjacent to the body portion 44 and is a recess 47 provided on the upper surface of the pedestal portion 43.
And are exposed in the recesses 48 provided at the edge of the upper surface of the pedestal portion 43. Further, the lead-out terminal 52 has an extending portion 52a arranged inside the pedestal portion 43, and a part of the extending portion 52a is exposed in a recess 49 provided at the upper edge of the pedestal portion 43.

The primary and secondary wires 53, 54 are wound around the body 44 of the bobbin 42. The procedure for winding the wires 53 and 54 will be described below. Starting ends 53 of the wires 53, 54
a and 54a are electrically connected and fixed to the extending portion 50a of the lead terminal 50 exposed from the recess 46 and the extending portion 51a of the lead terminal 51 exposed from the recess 47, respectively, and then the wires 53 and 54 are attached to the body portion 44. Roll in parallel. Next, the end portions 53b and 54b of the wire rods 53 and 54 are formed in the recesses 48, respectively.
The extended portion 51a and the recess 49 of the lead terminal 51 exposed from the
It is electrically connected and fixed to the extending portion 52a of the drawer end portion 52 exposed from the above. The coil component 41 thus obtained is
The same operational effects as the coil component 21 of the second embodiment are obtained.

[Fourth Embodiment, FIG. 8] FIG. 8 is a perspective view of a bobbin 62 used for the coil component of the fourth embodiment. The bobbin 62 includes a pedestal portion 63 and a body portion 64 provided at the center of the upper surface of the pedestal portion 63. A collar portion 65 is provided at the tip of the body portion 64. The bobbin 62 has a hole 66 penetrating the pedestal portion 63, the body portion 64, and the collar portion 65, and the core is inserted into the hole 66. The flange 65 has a notch 65 for crimping work.
a is provided.

The rectangular pedestal 63 is provided with lead terminals 70, 71 on one side surface on the front side. Drawout terminal 7
Reference numerals 0 and 71 denote extension portions 70 disposed inside the pedestal portion 63.
a, 71a, and a part of the extending portions 70a, 71a is a recess 67 provided adjacent to the body portion 64 on the upper surface of the pedestal portion 63.
And is exposed in a recess 68 provided at the upper edge of the pedestal 63.

The wire is wound around the body 64 of the bobbin 62. That is, when the starting end portion of the wire rod is applied to the extending portion 70a of the lead-out terminal 70 exposed from the recess 67, the crimping head of the crimping machine moves from above and the notch 65a provided in the collar portion 65 is inserted through the wire rod. The starting end of is heated under pressure. As a result, the starting end portion of the wire is pressure-bonded to the extending portion 70a and electrically connected and fixed. When the crimping of the starting end portion is completed, the crimping head retracts to the original position, and the wire rod is wound around the body portion 64. Next, the terminal end of the wire is electrically connected and fixed to the extending portion 71a of the lead-out terminal 71 exposed from the recess 68 by crimping similarly to the starting end. The coil component thus obtained has the same effect as the coil component 1 of the first embodiment.

[Fifth Embodiment, FIG. 9] FIG. 9 is a perspective view of a bobbin 82 used for the coil component of the fifth embodiment. The bobbin 82 includes a pedestal portion 83 and a body portion 84 provided at the center of the upper surface of the pedestal portion 83. The bobbin 82 has a hole 86 penetrating the pedestal portion 83 and the body portion 84, and the core is inserted into the hole 86.

On the side surface of the rectangular pedestal portion 83, the lead terminals 90 and 91 are formed by means of printing, sputtering, vapor deposition or the like.
Is provided. The lead terminals 90 and 91 are pedestal portions 83
It has extension parts 90a and 91a on the upper surface. In particular, the extending portion 90a reaches the body portion 84 so that the tip of the extending portion 90a is provided up to the portion where the bobbin 82 and the wire material contact. The wire rod is wound around the body portion 84 after the starting end portion thereof is electrically connected and fixed to the tip portion of the extending portion 90a on the body portion 84 side. Then, the terminal end of the wire is electrically connected and fixed to the extending portion 91a. The coil component thus obtained has the same effect as the coil component 1 of the first embodiment.

[Other Embodiments] The coil component according to the present invention is not limited to the above embodiment, but can be variously modified within the scope of the gist thereof.

In the first to fourth embodiments, the structure in which the extended portion of the lead-out terminal is exposed in the recess provided in the pedestal portion has been described, but the present invention is not limited to this. For example, the first embodiment. In the case of, as shown in FIG.
A structure may be employed in which the recessed portion is not provided in the pedestal portion 3 and the extending portion 10a whose front end portion is bent is directly exposed on the surface of the pedestal portion 3.

Further, in each of the above-described embodiments, the case where the extending portion of the lead terminal is exposed at the portion where the wire rod and the bobbin contact each other and is exposed on the upper surface of the terminal block has been described. However, the exposed portion of the extended portion may be at any position as long as it is a portion where the wire wound around the body and the bobbin come into contact with each other.
The extending portion may be exposed on the outer peripheral surface of the body portion, or the notch may be provided in the body portion and the extending portion may be exposed therein.

The shape of the bobbin is arbitrary, and for example, the bobbin 102 shown in FIG. 11 may be used. The bobbin 102 is composed of a pedestal portion 103 and body portions 104 and 105 provided in the upper and lower central portions of the pedestal portion 103, respectively. A collar portion 1 is provided on each of the tips of the body portions 104 and 105.
07 and 108 are provided. The bobbin 102 is the pedestal 1
03, the body portions 104 and 105, and the flange portions 107 and 108 are provided with holes 106, and the cores are inserted into the holes 106. The pedestal portion 103 is provided with a primary-side lead terminal 110 and a secondary-side lead terminal 111 on both side surfaces, respectively.
Although not shown, the lead-out terminals 110 and 111 have an extending portion disposed inside the pedestal portion 103 and are exposed in a recess provided in the upper and lower surfaces of the pedestal portion 103. Trunk 104,10
5 includes a primary wire rod 113 and a secondary wire rod 114, respectively.
Is wound. Then, the starting and ending portions of the wire members 113 and 114 are electrically connected to the extending portions of the lead terminals 110 and 111 by the same means as in the first embodiment,
Fixed.

Further, the plurality of extending portions may be arbitrarily connected to each other.

[0036]

As is apparent from the above description, according to the present invention, the end portion of the wire is connected to the extending portion of the lead terminal exposed at the portion where the bobbin and the wire are in contact with each other. The line area can be effectively utilized, and the height and the size can be easily reduced as compared with the conventional coil component.

The insulation distance between the ends of the wire is
Since the length is longer than that of the conventional coil component, a coil component having improved insulation resistance can be obtained. Further, since the end portion of the wire is fixed to the extending portion of the lead terminal, the conventional bending operation can be omitted, and the mechanism of the automatic winding machine can be simplified. As a result, it is possible to reduce the size of production equipment and improve the productivity of coil components.

When the extending portion of at least one lead terminal is exposed inside the outer circumference of the wire and the starting end of the wire is connected to this extending portion, the leading distance of the starting end is small. As a result, it is possible to occupy a small area in the winding area, and it is easy to reduce the height and size of the coil component. Also,
If the size is the same as that of the conventional coil component, the diameter of the wire rod can be increased and the copper loss of the coil component can be reduced.

Further, the extending portion of at least one lead terminal is exposed to the inside of the outer periphery of the second wire rod, and the end portion of the first wire rod is connected to this extending portion, whereby the end portion of the first wire rod is connected. Since there is no diagonal wiring in the outward direction and no gap is formed between the second wire rod and the second wire rod wound outside, it is possible to reduce the height and size of the coil component.

[Brief description of drawings]

FIG. 1 is an exploded perspective view showing a first embodiment of a coil component according to the present invention.

FIG. 2 is a perspective view showing a bobbin used in the coil component shown in FIG.

FIG. 3 is a partially cutaway perspective view showing a connection state between a wire rod and a lead terminal of the coil component shown in FIG.

4 is a cross-sectional view showing a connection state between a starting end portion of the wire rod shown in FIG. 3 and an extending portion of a lead terminal.

5 is a schematic structural diagram showing the coil component shown in FIG.

FIG. 6 is a schematic structural view showing a second embodiment of the coil component according to the present invention.

FIG. 7 is a schematic structural view showing a third embodiment of the coil component according to the present invention.

FIG. 8 is a perspective view showing a fourth embodiment of the coil component according to the present invention.

FIG. 9 is a perspective view showing a fifth embodiment of the coil component according to the present invention.

FIG. 10 is a cross-sectional view showing another embodiment.

FIG. 11 is a front view showing another embodiment.

FIG. 12 is a partial cross-sectional view showing a conventional example.

[Explanation of symbols]

1, 21, 41 ... Coil parts 2, 22, 42, 62, 82 ... Bobbin 3, 23, 43, 63, 83 ... Pedestal part 4, 24, 44, 64, 84 ... Body part 10, 11, 30-32 , 50 to 52, 70, 71, 9
0, 91 ... Lead-out terminals 10a, 30a, 31a, 50a, 51a, 70a, 9
0a ... extension part 14,33,34,53,54 ... wire rod 14a, 33a, 34a, 53a, 54a ... start end part 33b ... end part

Claims (4)

[Claims] 1. A bobbin including a pedestal portion and a body portion provided on the pedestal portion, a wire wound around the body portion, and at least two lead-out terminals provided on the pedestal portion, A coil component, wherein an extending portion of at least one lead terminal is exposed at a portion of the bobbin surface that is in contact with the wire, and an end portion of the wire is connected to the extending portion. 2. A bobbin including a pedestal part and a body part provided on the pedestal part, a wire wound around the body part, and at least two lead-out terminals provided on the pedestal part, A coil component, wherein an extending portion of at least one lead terminal is exposed to the inside of the outer periphery of the wire and the starting end of the wire is connected to this extending portion. 3. A bobbin including a pedestal portion and a body portion provided on the pedestal portion, a first wire rod wound around the body portion, and a second wire rod wound further outside the first wire rod. And at least two lead-out terminals provided on the pedestal portion, exposing the extension of at least one lead-out terminal inside the outer periphery of the second wire, and extending the first wire into the extension. A coil component characterized in that the terminal end of is connected. 4. A bobbin including a pedestal portion and a body portion provided on the pedestal portion, a first wire rod wound around the body portion, and a second wire rod wound further outside the first wire rod. And at least two lead-out terminals provided on the pedestal part, exposing the extension of at least one lead-out terminal inside the outer periphery of the first wire, and extending the first wire into the extension. Of the first wire rod is connected to the starting end portion of the second wire rod, and the extending portion of at least one lead terminal is exposed to the inside of the outer periphery of the second wire rod, and the terminal end portion of the first wire rod is connected to the extending portion. And coil parts.