JPH10106857A - Coil device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the size of a coil winding device and the height of the back face of the device. SOLUTION: A projecting section 1d is formed on the external surface of the lower flange section 1b of a drum core 1 wound with a coil 2 and the core 1 is positioned and fixed to an outer case 11 by inserting the projecting section 1d into a first hole section 11c in the bottom section 11b of the case 11. Then mounting terminals 5a are formed by inserting hoop terminals 5 connected with the end sections of the coil 2 into second holes lid formed at the four corners of the case 11 and folding one ends of the terminal 5 projecting from the bottom section 11a side of the case 11 so that the folded ends of the terminals can be tightly adhered to the bottom face of the case 11. Then coil connecting sections 5a are formed by bending the other ends of the terminals 5 projecting from the case 11 on the opposite side of the second hole sections 11d toward the inside of the base 11 after the other ends 2a of the coil are connected to the projecting sections.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a coil device mainly used as a high-frequency transformer, and more particularly to a coil device which can be made compact.

[0002]

2. Description of the Related Art As this type of coil device, for example, a coil device described in Japanese Utility Model Laid-Open No. 1-163306 is known. As shown in FIG. 13, in this coil device, the drum core 1 has flange portions 1b and 1c at both ends of the drum portion 1a.
The structure is such that the winding 2 is wound directly around the drum 1a. The ring core 3 is coaxially fitted and mounted on the outer periphery of the flanges 1b and 1c. Furthermore, the drum core 1 has a base 4
Is mounted and fixed on a concave portion 4a formed on the upper surface of
The ring core 3 is mounted and fixed on the outer periphery of the drum core 1 on the upper surface of the base 4.

A pair of notches 3a and 3b are formed in one end of the ring core 3 mounted on the base 4 in a diametrical direction, and the uncut portion of the ring core 3 and the flange 1b of the drum core 1 are formed. 1c is inscribed to form a magnetic circuit as a closed magnetic circuit.

The ring core 3 is provided near both ends of the base 4.
The hoop terminal 5 is mounted at a position facing the notches 3a and 3b. The end 2a of the winding 2 is drawn out through the notches 3a and 3b, and is wound around a portion 5a of the hoop terminal 5 which protrudes outward. Further, a portion 5b of the hoop terminal 5 protruding to the lower surface side of the base 4 is bent outward along the lower surface of the base 4, and serves as a mounting terminal when surface-mounted on a conductor pattern on a circuit board.

[0005]

According to the conventional coil device constructed as described above, the outer periphery of the flange 1b of the drum core 1 is fitted into the recess 4a of the base 4 so that the drum core 1 and the ring core 3 are fitted. Can be reliably positioned on the base 4. However, since the drum core 1 and the ring core 3 are placed on the base 4, the height of the coil device is the sum of the axial height of the drum core 1 and the thickness of the concave portion 4 a of the base 4,
Can't be low enough. Further, since the winding terminal 5a around which the coil 2 of the hoop terminal 5 is wound protrudes outward from the outer peripheral surface of the base 4, the length between opposing sides of the outer periphery of the coil device becomes longer, and the winding terminal May come into contact with other adjacent electrical components. For this reason, it is necessary to consider an arrangement position when mounting on a circuit board.

The present invention has been made in view of such a situation, and an object of the present invention is to provide a coil device which is easy to assemble and can reduce a height dimension and an outer dimension.

[0007]

In order to achieve the above object, according to the present invention, there is provided a drum core having flanges at both ends of a drum portion on which a winding is wound, and a drum core having an outer periphery of the drum core. In a coil device including a ring core coaxially mounted and a hoop terminal connecting a terminal of the winding, a protrusion formed on an outer surface of one flange portion of the drum core, the drum core and the ring core A square frame-shaped outer case having a side portion and a bottom portion for storing, and a first hole portion in which the protrusion portion of the flange portion is fitted into the bottom portion, and near four corners of the side portion of the outer case. A second hole formed through the terminal, into which the terminal is inserted, and one end of the terminal protruding from the bottom side of the second hole is turned outward;
A mounting terminal is formed in close contact with the bottom surface of the outer case, and the coil terminal is connected to the other end of the terminal protruding from the opposite side of the second hole, and the coil connection portion is connected to the outer case. It is characterized by being bent inward.

The coil device according to a second aspect is characterized in that a concave portion for accommodating a coil connection portion of the terminal is formed on one end surface of the ring core.

According to a third aspect of the present invention, in the coil device, recesses for fitting the mounting terminals are formed at four corners of the bottom of the outer case.

According to a fourth aspect of the present invention, in the coil device, the terminal is a hoop terminal formed of a hoop material.

According to a fifth aspect of the present invention, in the coil device, the terminal is a stud-shaped terminal having a flat head, and the flat head forms the mounting terminal.

[0012] In the coil device according to the first aspect,
Since the protrusion formed on the outer surface of the one flange portion of the drum core is fitted into the first hole formed on the bottom of the outer case, the positioning of the drum core with respect to the outer case can be reliably performed, Moreover, the height of the coil device can be reduced.

[0013] A terminal is inserted into a second hole formed to penetrate the vicinity of the four corners on the side of the outer case, and one end of the terminal is folded back along the bottom surface of the outer case so as to be a mounting terminal. Since the coil terminal is connected to the other end and folded inside the outer case, the mounting terminal and the coil connection portion do not protrude from the outer peripheral surface of the outer case, and the outer dimensions can be reduced. At the same time, when this coil device is mounted on a circuit board, it can be arranged close to other electric components.

In the coil device according to the second and third aspects, the coil connection portion is housed in the concave portion formed on one end face of the ring core, and the mounting terminals are fitted into the concave portions formed at the four corners at the bottom of the outer case. Because of the combination, the height of the coil device can be reduced.

[0015]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a coil device according to the present invention will be described below with reference to the drawings. 1 is an assembly top view of the coil device, FIG. 2 is a bottom view of FIG. 1, FIG. 3 is a partial cross-sectional front view of FIG. 1, FIG. 4 is a cross-sectional view taken along line AA of FIG. 6 is a partial cross-sectional front view of the drum core, FIG. 6 is a top view of the ring core of FIG. 1, FIG. 7 is a partial cross-sectional front view of FIG. 6, FIG. 8 is a top view of the outer case of FIG. FIG. 10
FIG. 9 is a partial cross-sectional front view of FIG. In these figures,
Parts corresponding to those of the conventional coil device shown in FIG. 13 are denoted by the same reference numerals, and description thereof will be omitted as appropriate.

As shown in FIG. 5, the drum core 1 has a columnar drum portion 1a and disc-shaped flange portions 1b and 1c provided coaxially and integrally at both ends of the drum portion 1a, as in the conventional example. . The drum core 1 is formed of a magnetic material such as ferrite. In the center of the bottom surface of one flange 1b, a protrusion 1 is provided.
d is formed integrally coaxially. The thickness of one of the flanges 1b including the protrusion 1d is substantially equal to the thickness of the other flange 1c. That is, the thickness of the flange 1b on the outer periphery of the protrusion 1d is smaller than the thickness of the flange 1c.

The ring core 3 is formed in an annular shape from a magnetic material such as ferrite as shown in FIGS. 6 and 7, and the inner diameter of the ring core 3 is slightly larger than the outer diameter of the flanges 1b and 1c of the drum core 1. ing. The ring core 2 is inscribed in the outer periphery of the flange portions 1b and 1c of the drum core 1 so that the ring core 2 can be fitted and mounted coaxially. On the upper surface of the ring core 3, a pair of left and right recesses 3a, 3
b is cut out and formed.

As shown in FIGS. 8 to 10, the outer case 11 is formed of a non-magnetic material such as plastic in a rectangular frame shape, and has a substantially square plate-like bottom portion 11a and side portions 11b surrounding the outer periphery of the bottom portion 11a. And are integrally formed. A circular first hole 11c having an inner diameter slightly larger than the outer diameter of the protrusion 1d formed on the flange 1b of the drum core 1 is formed through the center of the bottom 11a.
The inner circumference of the side portion 11b is a cylindrical surface having an inner diameter slightly larger than the outer circumference of the ring core 3.

In the vicinity of the four corners of the side portion 11b of the outer case 11, a rectangular second hole portion 11 into which the hoop terminal 5 is inserted is provided.
d is formed penetrating therethrough. As shown in FIG. 9, recesses 11e having a predetermined depth from the lower surface are cut out at the four corners where the second hole 11d is formed. Further, in the vicinity of the second hole 11d, as shown in FIGS. 8 and 10, a reinforcing guide 11f projecting from the upper surface of the side portion 11b by a predetermined height is integrally formed. An opening 11g is provided on two opposing sides of the side 11b.

Next, a procedure for assembling the drum core 1, the ring core 3, and the outer case 11 configured as described above will be described with reference to FIGS. As shown in FIG. 3, two windings 2 are wound around the drum portion 1a of the drum core 1. Note that the winding 2 may be wound two in parallel, or may be wound one after being wound one on top of the other.

A hoop terminal 5 previously formed in a strip shape from a thin metal plate is inserted into second hole portions 11d formed at four corners of the outer case 11, and one end 5b protruding from the lower surface of the side portion 11b is inserted into the outer case 11. The outer case 11 is bent outward so as to be substantially flush with the bottom surface of the case 11, and the leading end thereof is inserted into the concave portion 11 e of the outer case 11 or is brought into close contact with the outer surface of the case 11.

Next, the flange 1b of the wound drum core 1
After the protrusion 1d formed at the center of the bottom of the outer case 11 is fitted into the first hole 11 formed at the bottom 11a of the outer case 11, the ring core 3 is inserted into the outer case 11.

The terminal 2a of the winding 2 is pulled out from between the flange 1c of the drum core 1 and the recesses 3a, 3b of the ring core 3, and is projected from the hoop terminal 5 above the outer case 11.
The terminal 5a of the hoop terminal connected to the terminal 5a of the
Are accommodated in the concave portions 3a and 3b.

At this time, the drum core 1 is positioned by fitting the protruding portion 1d into the first hole portion 11, and the ring core 3 is a cylindrical surface formed on the inner periphery of the side portion 11b of the outer case 11. It is positioned and fixed by being inscribed in.

According to the configuration of the present embodiment, the protrusion 1d formed at the center of the bottom surface of the one flange 1b of the drum core 1
To the first hole 1 formed in the bottom 11a of the outer case 11.
1c, the drum core 1 can be reliably positioned with respect to the outer case 11. Further, a part of the thickness of the flange portion 1b of the drum core 1 is defined as a protrusion 1d, and further, one end 5a of a hoop terminal to which the terminal 2a of the winding 2 is connected.
3a formed in the ring core 3 by bending the
3b, the coil device does not protrude upward, so that the height of the coil device in the axial direction can be made substantially equal to the height of the drum core 1 and reduced. Also, the mounting terminal 5b
Does not protrude from the outer peripheral surface of the outer case 11,
The outer dimensions of the coil device can also be reduced. As a result, the possibility that the winding terminal comes into contact with another adjacent electric component or the like is reduced, and the degree of freedom of the arrangement position when the coil device is mounted on the circuit board increases.

In the above embodiment, the case where the number of windings 2 wound around the drum core 1 is two has been described, but the number of windings 2 is not limited to two. Further, in the above embodiment, the case where the terminal is the hoop terminal 5 formed in a band shape from a thin metal plate has been described, but the terminal may be a stud-shaped terminal 21 as shown in FIGS. 11 and 12. As shown in FIG. 11, the stud-shaped terminal 21 is a metal rod-shaped portion 21a.
And a flat head 1b integrally formed at one end thereof. As shown in FIG. 12, the stud-shaped terminals 21 are inserted into second holes 1d formed near the four corners of the outer case 11, and the flat head 21b is fitted into the recess 11e to form a mounting terminal. At this time, the end face of the flat head 21b and the outer case 11
Is flush with the bottom surface. Also, the tip 21c of the rod portion 21a
The terminal 2a of the winding 2 is wound in the same manner as in the case of the hoop terminal, and this coil connection portion is bent inside the outer case 11. In this case as well, the same effect as when the hoop terminal 5 is used can be obtained.

[0027]

As described above, according to the coil device of the present invention, the protrusion is formed on the outer surface of the flange of the drum core, and the protrusion is formed on the bottom of the outer case for accommodating the drum core and the ring core. Since the first hole to be fitted is formed, the positioning of the drum core becomes easy, and the height of the coil device in the axial direction can be reduced. Also, a second hole is formed near the four corners of the side of the outer case, a terminal is inserted into the second hole, and one end protruding from the bottom side of the second hole of the terminal is turned outward. Since the coil terminal was connected to the other end protruding from the opposite side and bent inside the outer case,
The external dimensions can be reduced without the terminals protruding from the outer peripheral surface of the outer case. At the same time, when this coil device is mounted on a circuit board, it can be arranged close to other electric components.

Further, the coil connection portion is accommodated in a concave portion formed on one end surface of the ring core, and mounting terminals are fitted into concave portions formed at four corners at the bottom of the outer case, thereby obtaining a height dimension of the coil device. Can be lowered.

[Brief description of the drawings]

FIG. 1 is an assembled top view showing a configuration of an example of an embodiment of a coil device of the present invention.

FIG. 2 is a bottom view of FIG. 1;

FIG. 3 is a partial sectional front view of FIG. 1;

FIG. 4 is a sectional view taken along line AA of FIG. 1;

FIG. 5 is a partial cross-sectional front view of the drum core of FIG. 1;

FIG. 6 is a top view of the ring core of FIG. 1;

FIG. 7 is a partial sectional front view of FIG. 6;

FIG. 8 is a top view of the outer case of FIG. 1;

FIG. 9 is a bottom view of FIG. 8;

FIG. 10 is a partial cross-sectional front view of FIG. 8;

FIG. 11 is a perspective view showing a configuration of a stud-shaped terminal according to another embodiment of the coil device of the present invention.

FIG. 12 is an essential part longitudinal cross sectional view showing a state where the stud-like terminal of FIG. 11 is mounted on an outer case;

FIG. 13 is a longitudinal sectional view showing a configuration of an example of a conventional coil device.

[Explanation of symbols]

1 Drum Core 1a Drum 1b, 1c Flange 1d Projection 2 Winding 3 Ring Core 3a. 3b recess 5 hoop terminal 5a coil connection 5b mounting terminal 11 outer case 11a bottom 11b side 11c first hole 11d second hole 11e recess 21 rivet terminal 21b flat head

Claims (5)

[Claims] 1. A coil comprising: a drum core having flange portions at both ends of a drum portion around which a winding is wound; a ring core coaxially mounted on an outer periphery of the drum core; and a terminal for connecting a terminal of the winding. In the device, a protrusion formed on an outer surface of one of the flanges of the drum core, a side portion and a bottom for housing the drum core and the ring core, and the protrusion of the flange fits into the bottom. A rectangular frame-shaped outer case having a first hole formed therein, and a second hole formed to penetrate the vicinity of four corners on the side of the outer case and into which the terminal is inserted, One end of the terminal protruding from the bottom side of the second hole is turned outward to form a mounting terminal in close contact with the bottom surface of the outer case, and the terminal protrudes from the opposite side of the second hole of the terminal. To the other end of the coil Coil means, characterized in that bending the connecting portion inside the outer casing. 2. The coil device according to claim 1, wherein a concave portion for accommodating a coil connection portion of the terminal is formed on one end surface of the ring core. 3. The coil device according to claim 1, wherein concave portions for fitting the mounting terminals are formed at four corners of a bottom portion of the outer case. 4. The coil device according to claim 1, wherein the terminal is a hoop terminal formed of a hoop material. 5. The coil device according to claim 1, wherein the terminal is a stud-shaped terminal having a flat head, and the flat head forms the mounting terminal.