JPH0528005U - Chip inductor - Google Patents

Abstract

(57) [Abstract] [Purpose] The present invention reduces the manufacturing cost and eliminates the need for plating or attaching metal pieces to form the electrode portion, and also reduces the cost of the coil to the electrode portion. An object of the present invention is to provide a chip inductor in which the winding terminal lead wire can be easily and surely connected. [Structure] A frame-shaped bobbin 11 composed of a tubular winding groove 11c sandwiched between two collars 11a and 11b, and the bobbin 11
In the chip inductor 10, which is composed of the coil 12 wound around the winding groove portion 11c, at least a part of the flange portion 11b of the flange portion is exposed to the outside at the side surface thereof. Since the winding terminal lead wires 12a and 12b of the coil 12 are wound, the portions exposed to the outside of the winding terminal lead wires 12a and 12b form the mounting electrode portion. , The chip inductor 10.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a chip inductor, and more particularly, to a surface mount type chip inductor having an electrode portion exposed on a lower surface or a side surface.

[0002]

[Prior Art]

 Conventionally, such a chip inductor is configured as shown in FIG. 5, for example. That is, in FIG. 5, the chip inductor 1 includes a bobbin 2 made of a frame-shaped ferrite core material, which is composed of a cylindrical winding groove portion 2c sandwiched between two upper and lower flange portions 2a and 2b, and a winding groove portion 2c of the bobbin 2. The coil 3 is wound around the coil.

As shown in the figure, two electrode portions 4 and 5 are provided on the bottom surface of the lower collar portion 2b, and the winding terminal lead wires 3a and 3b of the coil 3 are electrically connected by soldering. It is designed to be connected to. The electrode portions 4 and 5 are configured, for example, by plating the bottom surface of the collar portion 2b or by attaching a metal piece.

The chip inductor 1 configured as described above is surface-mounted on a printed circuit board (not shown) by fixing the electrode portions 4 and 5 by reflow soldering or the like. It is like this.

FIG. 6 shows another structure of the conventional chip inductor. In FIG. 6, the chip inductor 6 has a cylindrical winding groove portion 7 c sandwiched between two flange portions 7 a and 7 b. The bobbin 7 is made of a frame-shaped ferrite core material and the coil 8 is wound around the winding groove portion 7c of the bobbin 7.

As shown in FIG. 6 (B) or (C), each of the collar portions 7 a, 7 b is formed in a circular shape or a square shape, and as shown in the drawing, its outer end surface and side surface are The electrodes 9a and 9b are formed by plating or metal pieces. A winding terminal lead wire (not shown) of the coil 8 is electrically connected to the electrode portions 9a and 9b by soldering.

The chip inductor 6 configured as described above is surface-mounted on a printed circuit board (not shown) by fixing the electrode portions 9a and 9b by reflow soldering or the like. It is supposed to be done.

[0008]

[Problems to be solved by the device]

 However, in the conventional chip inductors 1 and 6 configured in this way, the electrode parts 4, 5 and 9a, 9b are formed by plating or metal pieces, so that the number of steps is large and the manufacturing cost is high. In addition, it is necessary to solder the winding terminal lead wire of the coil to the flat surface of the electrode portions 4, 5 and 9a, 9b, and the work is complicated and troublesome. There was a problem that the terminal lead wire could easily come off.

In view of the above points, the present invention eliminates the need for a plating process and a metal piece attaching operation to form an electrode portion, thereby reducing the manufacturing cost and coiling the electrode portion. It is an object of the present invention to provide a chip inductor in which the winding terminal lead wire can be easily and surely connected.

[0010]

[Means for Solving the Problems]

 According to the present invention, the above object is to provide a frame-shaped bobbin formed of a tubular winding groove portion sandwiched between at least two flange portions along a longitudinal direction, and a coil wound around the winding groove portion of the bobbin. In the chip inductor, the coil winding terminal lead wire is wound such that at least a part of the flange portion of the flange portion is exposed to the outside at the side surface. Thus, the chip inductor is characterized in that the exposed portion of the winding terminal lead wire constitutes an electrode portion for mounting.

[0011]

[Action]

 According to the above configuration, the winding terminal lead wire of the coil is directly wound around the flange portion to expose a part of the lead wire to the outside of the flange portion to form the electrode portion. It does not require steps such as plating and mounting metal pieces to provide the electrode part, and the structure can be simplified, and the work of connecting the winding terminal lead wire to the electrode part by soldering or the like is required. Since it is not necessary and the electrode portion is composed of the winding terminal itself, the winding terminal lead wire does not further come off from the electrode portion.

[0012]

【Example】

 Hereinafter, the present invention will be described in detail with reference to the embodiments shown in the drawings. FIG. 1 shows an embodiment of a chip inductor according to the present invention.

In FIG. 1, a chip inductor 10 includes a bobbin 11 made of a frame-shaped ferrite core material composed of a cylindrical winding groove 11 c sandwiched between two upper and lower flanges 11 a and 11 b, and a winding of the bobbin 11. The coil 12 is wound around the groove 11c.

The lower collar portion 11b is formed in a rectangular shape so as to slightly project toward both sides with respect to the upper collar portion 11a, and the protruding portion is formed as shown in the drawing. The winding terminal lead wires 12a and 12b of the coil 12 are each wound several times, and after the insulating coating on the wound portion is removed, they are formed as terminal electrode parts by soldering or the like. ..

The chip inductor 10 according to the present invention is configured as described above. For example, the chip inductor 10 is formed on the bottom surface of the winding terminal lead wires 12a and 12b forming the terminal electrode portion with respect to the print substrate (not shown). By fixing the exposed portion by reflow soldering or the like, the surface mounting is performed on the printed circuit board.

FIG. 2 shows another embodiment according to the present invention, in which the chip inductor 20 corresponds to a portion of the lower collar portion 11b where the winding terminal lead wires 12a and 12b are to be wound. The chip inductor 10 has the same configuration as that of the chip inductor 10 shown in FIG. 1, except that notches 13 and 14 for receiving the winding terminal lead wires 12a and 12b, respectively, are provided at the edges thereof.

According to this structure, the winding terminal lead wires 12a and 12b can be reliably wound at a predetermined winding position, and after completion, the winding terminal lead wire 12a constituting the terminal electrode portion. , 12b cannot be displaced from a predetermined position or come off from the collar portion 11b.

FIG. 3 shows another embodiment according to the present invention, in which the chip inductor 30 is made of a frame-shaped ferrite core material composed of a cylindrical winding groove portion 31c sandwiched between two flange portions 31a and 31b. The bobbin 31 and the coil 32 wound around the winding groove portion 31c of the bobbin 31.

As shown in FIG. 3 (B) or (C), the collar portions 31 a, 31 b are formed in a circular shape or a rectangular shape, and as shown in the drawing, a groove portion 33 is formed on the outer end surface thereof. , 34 are formed, and the winding terminal lead wires 32a, 32b of the coil 32 are wound in the groove portions 33, 34 as shown in the drawing, and the insulating film on the wound portion is removed. Then, it is formed as a terminal electrode portion by soldering or the like.

In the chip inductor 30 having such a configuration, for example, with respect to a printed circuit board (not shown), the portions exposed on the side surfaces of the winding terminal lead wires 32a and 32b forming the terminal electrode portion are reflow-soldered. It is designed to be surface-mounted on the printed circuit board by being fixed by, for example.

Further, FIG. 4 shows another embodiment according to the present invention, in which the chip inductor 40 is a cylindrical winding sandwiched by a plurality of collar portions 41a, 41b, 41c, ..., 41n. It is composed of a bobbin 43 formed along a frame-shaped ferrite core composed of groove portions 42a, 42b, 42c ... And a coil 44 wound around each winding groove portion 42a, 42b, 42c. There is.

Each of the collar portions 41a, 41b, 41c, ... Is formed in a square shape so as to slightly project toward both sides, and the projecting portion is, as shown in the drawing, a winding terminal. Corresponding to the portions where the lead wires 44a and 44b are to be wound, cut-out portions 45a and 45b for receiving the winding terminal lead wires are provided at the end edges thereof, respectively. The winding terminal lead wires 44a and 44b are wound around the notches 45a and 45b several times, respectively, and after the insulating coating on the wound portions is removed, they are used as terminal electrode portions by soldering or the like. It is configured.

The chip inductor 40 having such a structure is reflow soldered to a printed circuit board (not shown), for example, by exposing portions of the winding terminal lead wires 44 a and 44 b forming the terminal electrode portion to the side surfaces. It is designed to be surface-mounted on the printed circuit board by being fixed by, for example.

In the above description, the bobbin may be a magnetic material other than the ferrite material, or may be an insulating material. Further, the winding groove portion may have a rectangular tube shape.

[0025]

[Effect of the device]

 As described above, according to the present invention, it is possible to reduce the manufacturing cost and to wind the coil around the electrode portion by eliminating the need for plating and attaching metal pieces to form the electrode portion. It is possible to provide an extremely excellent chip inductor in which the wire terminal lead wire can be easily and surely connected.

[Brief description of drawings]

1 shows an embodiment of a chip inductor according to the present invention, (A) is a side view, (B) is a bottom view and (C) is a perspective view.

FIG. 2 shows another embodiment of the chip inductor according to the present invention, (A) is a side view, (B) is a bottom view and (C) is a perspective view.

3A and 3B show another embodiment of the chip inductor according to the present invention, FIG. 3A is a side view, FIG. 3B is a perspective view, and FIG. 3C is a perspective view showing another example of forming a collar portion.

FIG. 4 shows another embodiment of the chip inductor according to the present invention, (A) is a side view and (B) is a perspective view.

FIG. 5 shows an example of a conventional chip inductor, (A)
Is a side view and (B) is a bottom view.

FIG. 6 shows another example of a conventional chip inductor,
(A) is a side view, (B) is a bottom view, and (C) is a bottom view showing another example of forming the bottom surface.

[Explanation of symbols]

10, 20, 30, 40 Chip inductor 11, 31, 43 Bobbin 11a, 11b, 31a, 31b, 41a, 41b, 4
1c Collar part 11c, 31c, 42a, 42b, 42c Winding groove part 12, 32, 44 Coil 12a, 12b, 32a, 32b, 44a, 44b Winding end lead wire 13, 14, 45a, 45b Notch part 33, 34 Groove part

Claims (1)

[Scope of utility model registration request] 1. A frame-shaped bobbin formed of a tubular winding groove portion sandwiched by at least two flange portions along the longitudinal direction, and a coil wound around the winding groove portion of the bobbin. In the chip inductor, the winding terminal lead wire of the coil is wound so that at least a part of the collar portion of the collar portion is exposed to the outside at the side surface thereof, and thus the coil winding terminal lead wire is wound. A chip inductor, wherein a portion exposed to the outside of the terminal lead wire constitutes an electrode portion for mounting.