JP2001110649A - Attachment structure for magnetic component - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an attaching structure for magnetic component, with which a space for attachment is reduced as much as possible, high-density mounting is enabled, and assembly and disassembly can be facilitated. SOLUTION: A core 2 is provided with a central magnetic leg 2a, located on one surface of a core attaching member 1 while having an axial center along with a direction orthogonal with one surface. The central magnetic leg 2a is provided along with an axial direction and equipped with a through-hole with the side of the core attaching member 1 as a small diameter hole part 2c and with the opposite side as a large diameter hole part 2d. An attaching screw 4 is inserted into the through-hole and a nut 3 to be screwed with the side of a head 4a of the attaching screw 4 or with the attaching screw is housed in the large diameter hole part 2d. Then, by locking the core 2 in a step part 2e between the large-diameter hole part 2d and the small-diameter hole part 2c, the core can be fixed to the core attaching member 1.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic component mounting structure suitable for mounting a magnetic component such as a transformer or a choke coil on a substrate, a case, a radiator, or the like.

[0002]

2. Description of the Related Art Similar to other general electronic components, small magnetic components are mounted by soldering to a printed circuit board using external leads and electrodes. In some electronic devices, heavy transformers and choke coils are used, and mounting methods using fittings, screws, and the like have been conventionally performed. As a mounting structure using such screws,
Japanese Patent Application Laid-Open No. 1-136626 discloses a structure shown in FIG. In the structure shown in FIG. 5, the core is constituted by a combination of two pot cores 30, a through hole 32 is provided in each central magnetic leg 30 a and the metal case 31, a mounting screw 33 is passed through the through hole 32, and a nut 34 is formed. This is performed by screwing and fixing the mounting screws 33. 35 is a winding 36
The bobbin is subjected to.

[0003]

In recent years, demands for downsizing and high-density mounting of electronic devices have led to a demand for space reduction for mounting electronic components. However, in the above-described conventional example, metal fittings such as mounting screws protrude from the magnetic component, which is one of the factors that hinder high-density mounting. In addition, due to the increasing awareness of environmental issues in recent years, easy decomposability is also required so as to be able to cope with the separate collection and recycling of waste when disposing of electronic devices.

[0004] Therefore, an object of the present invention is to provide a magnetic component mounting structure in which a space for mounting is as small as possible and high density mounting is possible. Another object of the present invention is to provide a magnetic component mounting structure that can be easily assembled and disassembled.

[0005]

According to a first aspect of the present invention, there is provided a magnetic component mounting structure comprising a core, a conductive material, a core mounting screw, and a core mounting member. Is provided on one surface of the core mounting member, and has a central magnetic leg having an axis along a direction perpendicular to the one surface, and the central magnetic leg is provided along the axial direction, and the core mounting member The mounting screw is inserted into the through-hole, and a nut screwed into the head side of the mounting screw or the mounting screw is provided. By accommodating in the large-diameter hole, and engaging with a step between the large-diameter hole and the small-diameter hole,
The core is fixed to the core mounting member.

As described above, the head of the mounting screw or the nut to be screwed to the mounting screw is housed in the large-diameter hole provided in the core, so that the mounting screw or the nut can be vertically, horizontally, and vertically mounted on the magnetic component. Can be configured not to protrude in the
High-density mounting is possible without requiring any space for the mounting member. In addition, since the core is fixed by screwing, disassembly becomes easier as compared with the case of fixing with an adhesive or the like.

According to a second aspect of the present invention, in the first aspect, the large-diameter hole portion has a square hole shape, and the head or nut of the mounting screw housed in the large-diameter hole portion is the same. It is formed in the same shape as the large-diameter hole portion, is prevented from rotating, and is formed by threading the mounting screw through a through hole provided in the core mounting member and screwing the nut with the nut.

As described above, the large-diameter hole portion is formed into a square hole shape, and the head of the mounting screw or the nut is fitted into the hole with a non-rotating structure, so that the mounting to the core mounting member can be performed simply by turning the nut or the mounting screw. , Can be removed.

According to a third aspect of the present invention, in the second aspect, the nut is formed such that an axial length of the nut is longer than a maximum diameter of the large-diameter hole. It is characterized by being housed in.

[0010] With such a relative dimensional relationship between the large-diameter hole and the nut, erroneous insertion of the nut is prevented and assembly workability is improved.

A magnetic component mounting structure according to a fourth aspect is characterized in that, in any one of the first to third aspects, the core mounting member has a heat radiation function.

As described above, if the core mounting member is provided with a heat radiating function, heat can be radiated from the core without using a separate radiator.

According to a fifth aspect of the present invention, in the magnetic component mounting structure according to any one of the first to fourth aspects, the core has a shape having a side magnetic leg in addition to the central magnetic leg, and further fixed to the core. And another core that forms a closed magnetic circuit.

As described above, according to the structure of the present invention, by mounting the head of the nut or the mounting screw in the large-diameter hole, the mounting screw or the like can be mounted from the tip surface of the center magnetic leg or the side magnetic leg. A structure that does not protrude can be provided, and a closed magnetic path in which another core is added to the distal end surface can be configured. Also,
A configuration in which a winding wound around a bobbin is combined with a center magnetic leg can be adopted.

According to a sixth aspect of the present invention, there is provided the magnetic component mounting structure according to any one of the first to fourth aspects, wherein the core is formed by combining two cores.

As described above, even when two cores are used, one mounting screw can be used for both mounting the core and mounting the core to the core mounting member.

[0017]

FIG. 1 is a sectional view showing an embodiment of a magnetic component mounting structure according to the present invention. Reference numeral 1 denotes a radiator provided as a core mounting member. 2 is a drum core. The core 2 has flanges 2b at both ends of a center magnetic leg 2a, and a small-diameter hole 2 through which the mounting screw 4 is inserted is provided in the center magnetic leg 2a.
c is provided. A large-diameter hole 2d is provided at the end of the small-diameter hole 2c opposite to the core mounting member 1, and a through-hole is formed by the holes 2c and 2d. 5 is a winding as a conductive material. Reference numeral 6 denotes an insulating plate made of a resin plate or the like interposed between the core 2 and the core mounting member 1. The insulating plate 6 is not always necessary.

In mounting the magnetic component, the axis of the central magnetic leg 2a of the core 2 is set so as to be orthogonal to one surface of the core mounting member 1, and the mounting screw 4 is connected to the large-diameter hole 2d of the core 2, By passing through the small-diameter hole portion 2c, further through the through hole 6a of the insulating plate 6, and the through hole 1a provided in the core mounting member 1, and screwing and tightening the nut 3 on the back surface of the core mounting member 1, The core 2, that is, the magnetic component, is fixed to the core mounting member 1. The head 4a of the mounting screw 4 is the large-diameter hole 2
d, and the head 4a has a small-diameter hole 2c and a large-diameter hole 2d.
Is locked to the step 2e between the two.

As described above, by housing the head 4a of the mounting screw 4 in the large diameter hole 2d, the mounting screw 4 does not protrude from the core 2, that is, the mounting screw 4
It is possible to mount a magnetic component without securing a space for mounting.

In the magnetic component shown in FIG. 1, the core 2 can be constituted by a two-part structure as shown by a dotted line in the center. In this case, the winding 5 is wound around a bobbin 5a. The object can be fitted and attached to the center magnetic leg 2a.

FIG. 2A is a perspective view showing another embodiment of the present invention, and FIG. 2B is a sectional view thereof. Reference numeral 7 denotes a core. The core 7 is provided with a center magnetic leg 7b and four side corner magnetic legs 7c on a base portion 7a, and a small-diameter hole 7 in the center magnetic leg 7b.
d and a large-diameter hole 7e are provided, and the large-diameter hole 7e is formed in a square hole shape. The nut 10 fitted and accommodated in the large-diameter hole 7e is formed in a rectangular shape so as to be prevented from being rotated and accommodated in the large-diameter hole 7e.

Reference numeral 12 denotes a flat core fixed to the tip of the center magnetic leg 7b and the tip of the side magnetic leg 7c of the core 7 with an adhesive 13 or an adhesive tape. A closed magnetic circuit is formed by the base 7a and the side magnetic legs 7c.

The mounting screw 11 is inserted through the through hole 9a of the core mounting member 9 constituting the case or the substrate, the through hole 6a of the insulating plate 6, and the small diameter hole 7d of the core 7, and the nut in the large diameter hole 7e. By screwing and tightening to 10,
Attach cores 7 and 12. As the winding 5, a bobbin 5 a provided with the winding 5 can be used.

As described above, by holding the nut 10 in the large-diameter hole portion 7e while preventing the nut 10 from rotating, the cores 7 and 12 can be mounted on the core mounting member 9 only by turning the mounting screw 11. The core 7 is tightened by forming the head of the mounting screw 11 into a square shape, fitting the head into the large-diameter hole 7 e, and arranging and turning the nut 10 on the outer surface side of the core mounting member 9. It may be fixed. The large-diameter hole 7e
May be hexagonal or quadrangular. If the shape is such that the large diameter hole 7e and the head of the nut 10 or the mounting screw 11 do not need to have the same shape, one of them may be hexagonal or quadrangular.
The other may be square.

As shown in FIG. 2C, the relationship between the maximum hole width W of the large-diameter hole portion 7e and the axial length H of the nut 10 is such that H> W. As a result, erroneous insertion of the nut 10 is prevented, and assembling workability is improved.

By using a metal case or a metal substrate as the core mounting member 9 to provide a heat radiation function,
There is no need to provide a radiator for the magnetic component itself.

FIG. 3A is a sectional view showing another embodiment of the mounting structure for a magnetic component according to the present invention. In the present embodiment, E-type core 15 and I-type core 16 are used as cores.
Are used to form a closed magnetic circuit. These cores 15 and 16 are integrally fixed by an adhesive tape 17. Core 15, with adhesive,
16 may be joined. Central magnetic leg 15 of E-shaped core 15
A is provided with a through hole having a large diameter hole 15c at the end of the small diameter hole 15b, and a nut 14 is provided in the large diameter hole 15c. A bobbin 5a around which the winding 5 is wound is fitted to the center magnetic leg 15a of the E-shaped core 15. The magnetic component includes a mounting screw 19
The hole 1a of the core mounting member 1 composed of a radiator, the insulating plate 6
The hole 6a is inserted into the small-diameter hole 15b of the E-shaped core 15, screwed into the nut 14 locked to the step 15d, and tightened to be mounted on the core mounting member 1.

A closed magnetic circuit can be formed by using a U-shaped core 20 as shown in FIG. 3B instead of the I-shaped core 16. By providing the U-shaped core 20 as shown in FIG. 3B, a closed magnetic circuit having a gap between the center magnetic leg 15a and the U-shaped core 20 can be easily formed. Further, even when the I-type core 16 shown in FIG.
By making the heights of the side magnetic legs 15e and the center magnetic legs 15a different, a closed magnetic path with a gap can be formed.

FIG. 4 shows another embodiment of the present invention, in which a core fixed by a mounting screw 22 and a nut 23 is constituted by two cores 24 and 25 having the same shape. Reference numerals 24a and 25a denote small-diameter holes provided in the center magnetic legs 24b and 25b of the cores 24 and 25, 24c and 25c denote large-diameter holes, and 24d and 25d denote side magnetic legs. In this embodiment, the magnetic component can be mounted on the core mounting member 9 with one mounting screw 22 without using an adhesive tape or an adhesive.

The present invention can also be applied to a magnetic component formed by using a conductive material having a zero-turn structure instead of a conductive material being a winding.

[0031]

According to the first aspect of the present invention, since the mounting screws and nuts do not protrude from the core to the outside, the space for mounting is smaller than the structure using the conventional mounting screws, and high-density mounting is possible. . Further, since the magnetic component is mounted on the core mounting member by the mounting screw and the nut, assembly and disassembly of the magnetic component are facilitated.

According to the second aspect, in the first aspect, the large-diameter hole portion is formed into a square hole shape, and the head of the mounting screw or the nut is fitted into the hole with a non-rotating structure. Attachment to and removal from the core attachment member can be performed simply by turning the screw.

According to a third aspect, in the second aspect, the axial length of the nut is formed to be longer than the maximum diameter of the large diameter hole, and the nut is housed in the large diameter hole. Therefore, erroneous insertion of the nut is prevented, and assembling workability is improved.

According to the fourth aspect, in any one of the first to third aspects, since the core mounting member has a heat radiating function, the core can be radiated without using a separate radiator.

According to a fifth aspect, in any one of the first to fourth aspects, the core has a shape having a side magnetic leg in addition to the central magnetic leg, and is further fixed to the core to form a closed magnetic circuit. Therefore, a mounting structure of a magnetic component having a core that forms a closed magnetic circuit can be realized while having a structure using mounting screws.

According to the sixth aspect, in any one of the first to fourth aspects, the core is formed by combining two cores, so that one mounting screw is used for mounting the core and the core mounting member for the core. Can also be used for mounting to Therefore, it is not necessary to use an adhesive tape or an adhesive for bonding the core.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing one embodiment of a magnetic component mounting structure according to the present invention.

FIG. 2A is a perspective view showing another embodiment of the mounting structure of a magnetic component according to the present invention, FIG.
(C) is a diagram illustrating a dimensional relationship between the large-diameter hole and the nut.

FIG. 3A is a cross-sectional view showing another embodiment of the mounting structure for a magnetic component according to the present invention, and FIG. 3B is a partial cross-sectional view showing a modification thereof.

FIG. 4 is a sectional view showing another embodiment of the mounting structure of the magnetic component according to the present invention.

FIG. 5 is a sectional view showing a conventional example.

[Explanation of symbols]

1: core mounting member, 2: core, 2a: center magnetic leg, 2c:
Small diameter hole, 2d: Large diameter hole, 2e: Step, 3: Nut, 4: Mounting screw, 5: Winding, 5a: Bobbin, 6: Insulating plate, 7: Core, 7b: Central magnetic leg, 7c : Side magnetic legs, 7
d: small diameter hole, 7e: large diameter hole, 9: core mounting member, 1
0: nut, 11: mounting screw, 12: core, 13: adhesive, 14: nut, 15: E-shaped core, 15a: central magnetic leg, 15b: small diameter hole, 15c: large diameter hole, 16: I Mold core, 17: adhesive tape, 19: mounting screw, 20: U-shaped core, 24, 25: core, 24a, 25a: small-diameter hole,
24b, 25b: center magnetic leg, 24c, 25c: large-diameter hole, 24d, 25d: side magnetic leg

Claims (6)

[Claims] 1. A mounting structure for a magnetic component including a core, a conductive material, a mounting screw for the core, and a core mounting member, wherein the core is disposed on one surface of the core mounting member. A central magnetic leg having an axis along an orthogonal direction, the central magnetic leg being provided along the axial direction;
A through hole having a small-diameter hole portion on the core mounting member side and a large-diameter hole portion on the opposite side, wherein the mounting screw is inserted into the through hole, and is screwed into a head side of the mounting screw or the mounting screw. The core is fixed to the core mounting member by accommodating the mating nut in the large-diameter hole portion and locking the nut at a step between the large-diameter hole portion and the small-diameter hole portion. A mounting structure for a magnetic component, comprising: 2. The large-diameter hole according to claim 1, wherein the large-diameter hole has a square hole shape, and a head or a nut of the mounting screw housed in the large-diameter hole has the same shape as the large-diameter hole. A mounting structure for a magnetic component, wherein the mounting structure is prevented from rotating, and the mounting screw is passed through a through hole provided in the core mounting member and screwed with a nut. 3. The nut according to claim 2, wherein an axial length of the nut is formed longer than a maximum diameter of the large-diameter hole, and the nut is housed in the large-diameter hole. Mounting structure for magnetic parts. 4. The mounting structure for a magnetic component according to claim 1, wherein the core mounting member has a heat radiation function. 5. The magnetic recording medium according to claim 1, wherein the core has a shape having side magnetic legs in addition to a central magnetic leg, and the core is fixed to the core to form a closed magnetic circuit. A mounting structure for a magnetic component, comprising a core. 6. The mounting structure for a magnetic component according to claim 1, wherein the core is formed by combining two cores.