JP3200384B2 - Coil parts - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a coil component that can be used, for example, as a surface mount component.

[0002]

2. Description of the Related Art Conventionally, there has been a coil component used for a noise filter or the like having a configuration as shown in FIG.

[0003] The configuration of a conventional coil component 501 will be described below with reference to FIG.

That is, in FIG. 1, a bobbin 502 holds a wire 505 wound in a coil shape, and a bottom plate portion 503 is formed integrally with a bottom portion of the bobbin 502. Reference numeral 504b denotes a resin molded product having the insert.

[0005] A wire 505 is attached to the lead frame 504a.
Is wound and electrically connected by soldering (not shown). Similarly, the other end 505b of the wire 505 is wound around the lead frame 504b and soldered. This one end 505
a is at the beginning of winding of the coil shape and at the other end 505
“b” corresponds to the end portion of the winding of the coil shape.

On the other hand, the printed circuit board 511 is a substrate having an electric circuit pattern 510 formed on the back surface thereof and having holes 512a and 512b into which the lead frames 504a and 504b of the coil component 501 are inserted.
The lead frames 504a and 504b have holes 512a,
The pattern 510 is electrically connected to the pattern 510 by solder 513 at a portion protruding from the area b.

[0007] The coil component 501 thus configured is
Transmission of an electric signal to the pattern 510 is performed by the lead frame 5.
04a, 504b.

In addition to the conventional coil parts shown in FIG. 5, there are the following ones. That is, a coil component using a coil formed by winding a rectangular wire into a spiral shape instead of the wire 505 shown in FIG.

In this case, the method of connecting the lead frame to both ends of the rectangular wire does not take the method of winding around the lead frame as described above.

That is, of the terminals of the lead frame insert-molded on the bobbin 502, the terminal on the opposite side to the terminal connected to the putter on the substrate penetrates the bottom plate portion 503 of the bobbin 502, Sticking out to the side.
The protruding terminal has a flat plate shape. The flat terminals and both ends of the flat wire are spot-welded.

[0011]

However, in such a configuration, since the lead frame is electrically connected to the pattern on the printed circuit board via the lead frame, it is necessary to insert the lead frame into the bottom plate portion. There was a problem that it was not possible to reduce the cost and simplify the manufacturing process.

Particularly, in the case of a thin rectangular wire, there has been a demand for realizing a coil component as a so-called surface mount component that can be directly mounted on a pattern of a printed circuit board without using the lead frame.

An object of the present invention is to provide a coil component using a thin rectangular wire, which does not use a lead frame, in consideration of such problems of the conventional coil component.

[0014]

Means for Solving the Problems The first invention (claim 1)
(Corresponding to the present invention described above) is a coil member in which a thin rectangular wire is formed into a coil shape, and both ends of the rectangular wire are drawn out.
Except for the parts that have been done, the top, bottom,
And a core member surrounding the side surface, the coil member and / or
Or, holding the core member, a hole or a projection is provided.
Holding both ends of the rectangular wire substantially once around a predetermined portion of the holding portion using the hole, or substantially once around the convex portion. The surfaces of both ends of the wound rectangular wire to be connected to the printed board are: (1) When the hole is used, the printed board is closer to the printed board than the bottom surface of the predetermined portion. (2) When the wire is wound around the convex portion, the wire protrudes from the bottom surface of the convex portion toward the printed circuit board, and is provided at the winding portions at both ends of the rectangular wire.
The width direction of the flat wire faces the side surface of the coil member.
And a coil component substantially perpendicular to the thickness direction of the side wall of the core member .

The second invention (the invention according to claim 2)
Corresponds to the above), the holding section holds the coil member
Bobbin, and the bobbin is provided with the convex portion.
And the ends of the rectangular wire are wound around the tip of the projection.
A flange portion is provided to prevent the escape portion from coming off.
The two ends of the flat wire will be connected to the printed circuit board.
Surface protrudes from the lower surface of the flange toward the printed circuit board.
Or the same height as the lower surface.
Coil components.

The third invention (the invention according to claim 3)
The corresponding), said coil member comprises a primary coil and a secondary coil, both ends of both ends and the secondary coil of the primary coil
Are drawn from opposite sides with respect to the core member
Being, the holding portion has the convex portion, the convex portion is Ri projections der provided in pairs respectively as for a and a secondary coil for the primary coil, a pair for the primary coil
The protrusions of the primary coil are drawn out at both ends.
Side, substantially the same as the thickness direction of the side wall of the core member.
Projecting in the direction perpendicular to the upper direction, and
Both ends of the secondary coil are pulled out of a pair of protrusions for
On the exposed side, the thickness of the side wall of the core member
Above that project individually in a direction substantially perpendicular to the
It is a coil component of the first present invention. Also, the fourth present invention
(Corresponding to the fourth aspect of the present invention) is a thin plate-shaped rectangular wire.
A coil member formed in a coil shape, both of the flat wire
Except for the part where the end is pulled out, above the coil member
A core member surrounding a face, a lower face, and a side face, and the coil
A hole or a projection holding the member and / or the core member
And a holding portion which is provided, both ends of the rectangular wire is pre
Substantially once wound around a predetermined portion of the holding portion by utilizing the hole portion
Or is wound substantially once around the protrusion
Both ends of the flat wire being wound
Having an end, the surface to be connected on the printed circuit board
(1) If the hole is used,
(2) wound around the convex portion
If it is, it is provided on the bottom side of the protrusion.
The flat portion of the wire at the winding portions at both ends.
The width direction of the rectangular wire faces the side surface of the coil member.
Coil component substantially perpendicular to the thickness direction of the side wall of the core member
It is.

Thus, a coil component that does not use a lead frame can be provided.

[0018]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a perspective view of a coil component 101 according to an embodiment of the present invention, and FIGS. 2 to 3 are views showing the components thereof. Will be described.

FIG. 2 shows cores (magnetic cores) 105b provided on the primary coil 102 side and the secondary coil 103 side.
FIG. 3 is a perspective view of the bobbin 106. FIG.

As shown in FIG. 1, the bobbin 106 is a resin molded part that holds the primary coil 102 and the secondary coil 103. Primary coil 102 and secondary coil 103
Is a coil formed by winding a thin rectangular wire 104 into a spiral shape. That is, it is wound so that the width direction of the thin rectangular wire 104 is orthogonal to the axial direction of the spiral shape. The secondary coil 103 is stacked on the upper side of the primary coil 102 via an insulating sheet 108 described later. One end 102a and the other end 102b of the primary coil 102 are
a and b are wound respectively. Secondary coil 10
3, one end 103a and the other end 103b (the other end 103
4 (b) (see FIG. 4 (a)), similarly to the primary coil 102, the projection 117 on the lower portion of the bobbin 106.
a and b (see FIG. 4A for 117b). The bobbin 106 will be described later in detail with reference to FIG. 3, including the shapes of the four protrusions 116a to 117b.

The cores 105a and 105b are iron cores of the same shape having a U-shaped cross section and having cores 105c and 105d projecting in a columnar shape in the center (see FIG. 2). Core 105
Reference numerals a and 105b are provided so as to surround the coils 102 and 103 housed inside the side wall portion 301 (see FIG. 3) of the bobbin 106, including the side wall portion 301, from above and below. The core portions 105c and 105d are inserted into spaces formed on the central axes of the coils 103 and 102. The pair of cores 105 a and 105 b are fixed to the bobbin 106 by the spring property of the core fastening member 107. The core fastening member 107 is a plate-shaped spring member having a substantially U-shaped cross section. Core fastening bracket 10
Claws 107a that are bent further inward are formed on both ends of the upper and lower ends of the U-shaped character.

As described above, the insulating sheet 108 is provided between the primary coil 102 and the secondary coil 103 and also provided between the upper and lower cores 105a and 105b. Paper. The insulating sheet 108
The outer shape is a circular shape slightly larger than each of the coils 102 and 103, and a hole through which the core portions 105c and 105d pass is formed in the center.

Next, referring to FIG.
Will be described in more detail as described above.

That is, the side wall portion 301 is
A space for accommodating 103 is a pair of side walls formed on the inner surface side, and stands upright facing each other with the central axes of the coils 102 and 103 interposed therebetween.

Also, the above-mentioned four projections 116a to 116a
Reference numeral 7b denotes a quadrangular prism that protrudes in the front-rear direction (corresponding to a diagonally lower right direction and a diagonally upper left direction in FIG. 3) at the lower four corners of the bobbin 106. These four
The tip of each of the protrusions 116a to 117b has a collar 3
06a, 306b, 307a, and 307b (see FIG. 4A for 307b), respectively.
The flanges 306a and 306b are provided with the protrusions 116a and 116, respectively.
b, the one end portion 102a and the other end portion 102b of the primary coil 102 respectively move and
This is for preventing easy removal from a and b. The flange portions 307a and 307b are also provided for one end 103a and the other end 103b of the secondary coil 103 for the same purpose as described above.

The notches 302a and 302b are spaces for inserting both ends of the flat wire 104 of the primary coil 102. Regarding the secondary coil 103, a cutout similar to that described above is provided between the protrusion 117a and the protrusion 117b.

By the way, as shown in FIG.
03 (represented by a two-dot chain line in FIG. 3), the flat wire 303a constituting the lowermost surface has its tip (corresponding to one end 103a) wound around the projection 117a, and the flat wire 303b constituting the uppermost surface. Has its tip (corresponding to the other end 103b) wound around the projection 117b (FIG. 4).
(B)).

Note that one end portions 102a and 103a of each coil
The bottom surfaces of the other end portions 102b and 103b are provided with a pattern 402 on a printed circuit board 401 described later.
a, 403a and 402b, 403b (see FIGS. 4 (a), 4 (b)). Also, each end 102a, 102b, 103a, 103b of these rectangular wires
In this case, the insulating film is removed in advance to form a solder film.

Next, the case where the thus configured coil component 101 of this embodiment is mounted on a printed circuit board 401 will be described with reference to FIGS. 4 (a) and 4 (b).

FIGS. 4A and 4B show the coil component 101.
FIGS. 3A and 3B are diagrams showing a state in which is disposed on a printed circuit board 401. FIG. 3A is a plan view, and FIG.

That is, as shown in FIGS. 4A and 4B, the coil component 101 is positioned at a predetermined position on the printed circuit board 401, and the bottom surface of one end 102a and the other end 102b of the primary coil 102 is formed. Side and patterns 402a, 40
The surface of 2b is to be soldered (not shown). Similarly, the bottom surfaces of one end 103a and the other end 103b of the secondary coil 103 and the patterns 403a and 403b
Is soldered. Therefore, a through hole unlike the related art is not required on the surface on which the soldering is performed on these patterns.

As described above, according to the present embodiment, both ends of the rectangular wire are used as terminals, and the projections of the bobbin are used for fixing the terminals. It is not necessary to use the components, and the number of parts can be reduced. Also, since there is no need to perform spot welding with the lead frame, the manufacturing process can be simplified.

Further, even if the rectangular wire is thin, since it is wound around the projection, each end of the rectangular wire can be reliably positioned and soldered to the pattern.
Furthermore, since the tip of the projection is in a brim shape, each end of the rectangular wire can be fixed more reliably.

Further, since the electric signal is directly transmitted from the coil to the pattern without passing through the lead frame, unnecessary circuit resistance can be reduced.

Note that the holding member of the present invention is not limited to the bobbin provided with the protrusion in the above embodiment, and may be, for example, a bobbin provided with a hole. That is, as an example of this case, the notch portions 302a and 302b shown in FIG.
A configuration in which four through holes are respectively formed instead of the four notched portions including. In this case, each end of the flat wire is passed through the corresponding through hole once and wound around the four corners of the bobbin 106, respectively. Therefore, except that the notch portion is replaced with a through hole, the wound state is basically the same as the state shown in FIG. 1, and the same effect as in the above-described embodiment is exerted. Further, in this case, even if the flange portions 306a and 306b are not provided, each end can be securely fixed by the function of the through hole.

Further, the coil member of the present invention is not limited to the case of the primary coil and the secondary coil of the above embodiment, but may be composed of, for example, one or three or more coils. .

[0038]

As is apparent from the above description,
The present invention has an advantage that a coil component using a thin rectangular wire without using a lead frame can be provided.

[Brief description of the drawings]

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

FIG. 2 is a perspective view of a pair of cores used in the coil component according to the embodiment.

FIG. 3 is a perspective view of a bobbin used for the coil component of the embodiment.

FIG. 4A is a plan view showing a state where the coil component of the present embodiment is arranged on a printed circuit board. FIG. 4B is a front view showing a state where the coil part of the present embodiment is arranged on a printed circuit board.

FIG. 5 is a sectional view of a conventional coil component.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 101 Coil component 102 Primary coil 103 Secondary coil 104 Rectangular wire 105a, b Core 106 Bobbin 116a, b Projection 117a, b Projection 108 Insulation sheet 301 Side wall 401 Printed circuit board 402a, b Pattern

Claims (4)

(57) [Claims] 1. Except for a coil member in which a thin rectangular wire is formed into a coil shape and a portion from which both ends of the rectangular wire are drawn out,
Core member surrounding the upper, lower, and side surfaces of the coil member
And a hole holding the coil member and / or the core member
And a holding portion provided with a convex portion , both ends of the flat wire using the hole portion of the holding portion
The surface which is wound substantially once on a predetermined portion or wound substantially once on the convex portion, and which is to be connected to a printed board at both ends of the wound flat wire is (1) If you use the hole, the provided exits the printed circuit board side from the bottom surface of the predetermined portion, (2) if wound on the protrusion, the from the bottom surface of the convex portion and it exits the printed circuit board side, the flat angle of the winding portion at both ends of the rectangular wire
The core in which a width direction of a line faces a side surface of the coil member
A coil component substantially perpendicular to a thickness direction of a side wall of a member . 2. The holding section holds the coil member.
Bobbin, and the bobbin is provided with the convex portion.
And the winding portions at both ends of the flat wire at the tip of the convex portion.
A flange portion is provided to prevent disconnection of the flat wire, and both ends of the flat wire are connected to a printed circuit board in advance.
The fixed surface projects from the lower surface of the flange toward the printed circuit board.
Or the same height as the lower surface
The coil component according to claim 1. 3. The coil member includes a primary coil and a secondary coil, and both ends of the primary coil and both ends of the secondary coil are
Pulled out from opposite sides with respect to the core member
Ri, the holding portion has the convex portion, the convex portion is Ri projections der provided in pairs respectively as for a and a secondary coil for the primary coil, a pair of projections for the primary coil, Of the primary coil
On the side from which both ends are pulled out, in front of the core member
Individually project in a direction substantially perpendicular to the thickness direction of the side wall
In addition, the pair of protrusions for the secondary coil,
On the side from which both ends of the secondary coil are drawn out,
In a direction substantially perpendicular to the thickness direction of the side wall of the core member
The coil component according to claim 1, wherein the coil component protrudes individually . 4. Except for a coil member in which a thin rectangular wire is formed into a coil shape and a portion from which both ends of the rectangular wire are drawn out,
Core member surrounding the upper, lower, and side surfaces of the coil member
And a hole holding the coil member and / or the core member
And a holding portion provided with a convex portion , both ends of the flat wire using the hole portion of the holding portion
Is wound substantially once around a predetermined site, or
The wrapper is wound substantially once around the convex portion, and the pudding is provided at both ends of the wound flat wire.
The part having the surface to be connected on the substrate is (1)
When using the hole, the bottom side of the predetermined portion
And (2) when it is wound around the projection.
In the case, the flat portion is provided on the bottom side of the convex portion, and the flat portion at the winding portion at both ends of the flat wire is provided.
The core in which a width direction of a line faces a side surface of the coil member
Characterized by being substantially orthogonal to the thickness direction of the side wall of the member.
Coil parts .