JPH0576014U - Magnetic parts - Google Patents

Abstract

(57) [Abstract] [Purpose] To prevent rattling between the insulating member holding the through conductor and the magnetic core, to eliminate the positional fluctuation of the through conductor with respect to the magnetic core, and to ensure accurate mounting on the printed circuit board. To [Structure] The through conductors (11, 11A) are insulated and positioned by a resin molded product (12), the resin molded product (12) holding the through conductor is arranged in a through hole portion of a magnetic core (4), and the through conductor end portion is aforesaid. A protrusion 1 that is pulled out from both ends of the magnetic core and contacts the resin molded product 12 with the inner surface of the magnetic core.
4 is formed, and the protrusion 14 prevents rattling.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a magnetic component that can be used as a component of a high frequency transformer or a high frequency coil for a switching power supply or the like.

[0002]

[Prior Art]

 A conventional magnetic component of this type is U.S. Pat. No. 4,455,545. The magnetic component of this US patent has a plurality of conductors penetrating through the through-holes of a UU type magnetic core, and both ends of the conductors are inserted into a printed circuit board. Are connected to form a coil.

In this magnetic component of US Pat. No. 4,455,545, a plurality of penetrating conductors pass through the space inside the magnetic core hole in an exposed state and are drawn out from both ends of the magnetic core. There were drawbacks that the dimensions between conductors varied, the breakdown voltage between the through conductor and the magnetic core was difficult to obtain, and automatic assembly was not possible.

On the other hand, in Japanese Patent Application No. 3-14196 filed by the present applicant, the through conductor is insulated and positioned by an insulating member, and the insulating member holding the through conductor is arranged in a through hole of a magnetic core. The following magnetic parts have been proposed.

12 and 13 show the magnetic parts proposed by the present applicant. In these figures, 1 is a through conductor, 2 is a resin molded product as an insulating member, and 4 is a magnetic core formed by abutting U-shaped cores 3A and 3B such as ferrite.

[Problems to be solved by the device]

By the way, if there is a gap G between the resin molded product 2 holding the through conductor 1 and the magnetic core 4 due to a difference in size, rattling occurs between the two and the printed circuit board of the through conductor is formed. The mounting positioning on the will become unstable.

In view of the above points, the present invention can prevent rattling between the insulating member holding the through conductor and the magnetic core to eliminate the positional variation of the through conductor with respect to the magnetic core. An object of the present invention is to provide a magnetic component that can be accurately mounted on a printed circuit board.

[0008]

[Means for Solving the Problems]

 In order to achieve the above object, the magnetic component of the present invention is characterized in that a through conductor is insulated and positioned by an insulating member, and the insulating member holding the through conductor is arranged in a through hole portion of a magnetic core. The end portion is pulled out from both ends of the magnetic core, and the insulating member is formed with a projection portion that is in contact with the inner surface of the magnetic core.

The protrusion may have elasticity and be in pressure contact with the inner surface of the magnetic core.

Further, the insulating member may include a wall portion that engages with both end surfaces of the magnetic core.

Further, when a plurality of penetrating conductors are positioned by the insulating member, any of the plurality of penetrating conductors may be formed to have a large diameter or a wide width.

[0012]

[Action]

 In the magnetic component of the present invention, a portion corresponding to a winding portion of an ordinary transformer or coil has a structure in which through conductors whose both ends are open are mutually insulated and positioned by resin molding or the like. The magnetic component has a magnetic core of U-U type, U-I type or the like mounted around the structure. At that time, since the protrusion that contacts the magnetic core is formed on the insulating member that positions the through conductor, rattling between the magnetic core and the insulating member can be prevented. Therefore, it can be mounted accurately on a printed circuit board, and after mounting, a transformer or coil can be formed by the wiring (conductor pattern etc.) on the printed circuit board side. In this case, the dimensions between the through conductors can always be kept constant, the variation of leakage inductance and distributed capacitance can be made extremely small, and one or more through conductors can be insulated by resin molding or the like. Since it is integrated with, it is easy to handle and can be automatically assembled and automatically attached to the printed circuit board. Furthermore, in the case of a structure in which one or more through conductors are sealed and molded by resin molding, cleaning with a chemical is also possible.

[0013]

【Example】

 An embodiment of a magnetic component according to the present invention will be described below with reference to the drawings.

1 to 7 show a first embodiment of the present invention. In these figures, 11 and 11A are through conductors whose both ends are bent in an L shape so that they can be surface-mounted on the surface of a printed circuit board, and 12 is an insulating member for insulating and positioning a plurality of through conductors from each other. It is a resin molded product. The resin molded product 12 is integrally molded (simultaneously molded) with the plurality of through conductors 11 and 11A by resin molding. Here, the through conductor 11A is formed wide so as to pass a large current. Further, a tapered convex portion 13 is integrally formed on the right side surface of the resin molded product 12, and two projecting portions 14 each having a triangular planar shape are integrally formed on the most protruding ridge line portion of the tapered convex portion 13. Has been formed. Continuous wall portions 16 are integrally formed on the front and rear edges of the upper and lower surfaces of the resin molded product 12. Then, U-shaped cores (cores having a U-shaped cross section) 3A and 3B such as ferrite are mounted so as to abut each other so as to sandwich the resin molded product 12 from above and below. These U-shaped cores 3A, 3B made of ferrite or the like constitute a U-U type magnetic core 4 having a through hole portion 15 in a butted state, and each through conductor 11, 11A penetrates through the hole portion 15. Then, the holes are pulled out from both sides of the hole. When the magnetic core 4 is mounted around the resin molded product 12 as described above, the tip of the protrusion 14 is pressed against the inner wall surface of the through hole 15 of the magnetic core 4 as shown in FIG. The shaded portion of 7 is deformed by elasticity or is partially scraped and deformed). Further, each connecting wall portion 16 engages with the front and rear end faces of the magnetic core 4.

According to the first embodiment described above, the dimensional difference between the lateral width dimension W1 of the through hole portion 15 of the magnetic core 4 and the lateral width dimension W2 (of the portion having no protrusion) of the resin molded product 12 that is predicted in advance. By setting the protrusion size of the protrusion 14 before assembly to be larger than that of the magnetic core, the protrusion 14 on the resin molded product side is pressed against the inner wall surface of the through hole 15 and deformed, so that the magnetic core It is possible to prevent rattling due to the dimensional difference between the resin 4 and the resin molded product 12. Further, the positioning of the magnetic core 4 and the resin molded product 12 in the front-rear direction (drawing direction of the through conductor) is performed by engaging the continuous wall portions 16 formed on the upper and lower surfaces of the resin molded product with the front and rear end faces of the magnetic core 4. To be achieved. As a result, it is possible to manufacture the optimum magnetic component as a component of a high frequency transformer or a high frequency coil in which the positions of the through conductors 11 and 11A are accurately determined with respect to the magnetic core 4, and the mounting on the printed circuit board can be performed with high accuracy. You can

FIG. 8 shows a second embodiment of the present invention. In this case, the taper-shaped convex portion on the right side surface of the resin molded product 12 is omitted, and the slightly longer protrusion 14A is integrally formed on the flat right side surface of the resin molded product 12. The other structure is the same as that of the first embodiment described above, and the effect of providing the protrusion 14A is substantially the same as that of the first embodiment.

FIG. 9 shows a third embodiment of the present invention. In this case, a protrusion 14B whose tip is curved downward in a bow shape is integrally formed on the flat right side surface of the resin molded product 12 so as to sufficiently exert elasticity. When the magnetic core 4 is mounted around the resin molded product 12, the downwardly curved protrusion 14B elastically presses against the inner wall surface of the through hole 15 of the magnetic core 4 to form the resin molded product 12. It is possible to prevent rattling between the magnetic cores 4. The rest of the configuration and effects are similar to those of the first embodiment described above.

FIG. 10 shows a fourth embodiment of the present invention. In this case, a projection 14C whose tip is curved laterally in a bow shape is integrally formed on the flat right side surface of the resin molded product 12 so as to sufficiently exert elasticity. When the magnetic core 4 is mounted around the resin molded product 12, the laterally curved protrusion 14C elastically presses against the inner wall surface of the through hole 15 of the magnetic core 4 so that the resin molded product 12 It is possible to prevent rattling between the magnetic core 4 and the magnetic core 4. The rest of the configuration and effects are similar to those of the first embodiment described above.

FIG. 11 shows a fifth embodiment of the present invention. In this case, instead of the continuous wall portion, partial wall portions 16A are integrally formed on the front and rear edges of the upper and lower surfaces of the resin molded product 12. Also in this case, the respective partial wall portions 16A engage with the front and rear end faces of the magnetic core, and the magnetic core 4 and the resin molded product 12 can be positioned in the front and rear direction (drawing direction of the through conductor). The rest of the configuration and effects are similar to those of the first embodiment described above.

It should be noted that in each of the above-described embodiments, there are a plurality of penetrating conductors, and any one of them is formed wide, but it is also possible to have a large diameter instead of widening. Further, it goes without saying that all of the plurality of through conductors may have the same width or the same diameter, and it is obvious that the present invention can be applied to the case where there is only one through conductor. Also, in each example, a U-U type magnetic core in which two U-shaped cores such as ferrite are abutted is shown. There is no problem even if the above is adopted, and other core structures can be adopted as long as the through holes can be obtained. In addition, the cores can be butt-integrated together and fixed between the resin molded product having a through conductor and the cores by using an adhesive, etc. It does not matter if the cores are integrated. Further, the number of protrusions formed on the insulating member side may be one or more.

The wiring pattern on the printed circuit board can be changed as appropriate, and a high frequency coil having only one winding or a high frequency transformer having two or more windings can be configured.

In addition, the insulation between the magnetic core and the conductor pattern on the upper surface of the printed circuit board may be performed by winding an insulating tape around the magnetic core, inserting an insulating plate between the magnetic core and the board, or mounting the magnetic core on the board surface. It can be carried out by slightly floating it.

[0023]

[Effect of the device]

 As described above, the magnetic component of the present invention has the structure in which the insulating member for insulating and positioning the through conductor is arranged in the through hole portion of the magnetic core. It is possible to prevent rattling between the insulating member and the magnetic core by contacting the inner wall surface. As a result, it is possible to eliminate the variation in the position of the through conductor with respect to the magnetic core, which in turn makes it possible to accurately mount the printed conductor on the printed circuit board. Obtainable. In addition, the insulation member can mechanically determine the mutual spacing of the through conductors, thereby making it possible to minimize variations in leakage inductance and distributed capacitance. In addition, since the penetrating conductor is covered by the insulating member except for both ends, the insulating member and the magnetic core can be easily aligned with each other, which enables automatic assembly and automatic mounting on the printed circuit board. Furthermore, when the through conductor is sealed and molded with a resin mold, cleaning with a chemical becomes possible.

[Brief description of drawings]

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

FIG. 2 is a front view of the same.

FIG. 3 is a side view of the same.

FIG. 4 is a plan view similarly omitting a magnetic core.

FIG. 5 is a side view in which the magnetic core is omitted as well.

FIG. 6 is an enlarged front view of the relevant part.

FIG. 7 is an explanatory view showing the action of the protrusion in the first embodiment.

FIG. 8 is an enlarged front view of essential parts showing a second embodiment of the present invention.

FIG. 9 is an enlarged front view of essential parts showing a third embodiment of the present invention.

FIG. 10 is an enlarged plan sectional view of an essential part showing a fourth embodiment of the present invention.

FIG. 11 is a plan view showing a fifth embodiment of the present invention with a magnetic core omitted.

FIG. 12 is a front view showing a conventional magnetic component.

FIG. 13 is a side view of the same.

[Explanation of symbols]

 1,11,11A Through conductor 2,12 Resin molded product 3A, 3B U-shaped core 4 Magnetic core 14,14A, 14B, 14C Projection 15 Through hole 16,16A Wall

Claims (5)

[Scope of utility model registration request] 1. A through conductor is insulated and positioned by an insulating member, the insulating member holding the through conductor is disposed in a through hole of a magnetic core, and the through conductor end is pulled out from both ends of the magnetic core. A magnetic component, characterized in that the insulating member is formed with a protrusion that contacts the inner surface of the magnetic core. 2. The magnetic component according to claim 1, wherein the protrusion has elasticity and is pressed against the inner surface of the magnetic core. 3. The magnetic component according to claim 1, wherein a plurality of the protrusions are formed on one side surface of the insulating member. 4. The magnetic component according to claim 1, wherein the insulating member is formed with wall portions that engage with both end faces of the magnetic core. 5. The magnetic component according to claim 1, wherein a plurality of through conductors are positioned by the insulating member, and any one of the plurality of through conductors is formed to have a large diameter or a wide width.