JPH0513025U - Ferrite core - Google Patents

Abstract

(57) [Summary] [Purpose] The outer dimensions of the abutting surfaces of the upper and lower magnetic cores, which are ferrite cores divided into two, are the same, and a step is formed in a part of the upper magnetic core And a ferrite core that makes the transformer and coil assembly easier by strengthening the adhesion density of the lower core. [Structure] The outer dimensions of the abutting surfaces of the upper magnetic core 5 and the lower magnetic core 6 are the same, and the outer surface of the upper magnetic core 5 is placed on both outer sides thereof between the abutting surface of the lower magnetic core 6 and the upper magnetic core 5. A step 6 having a partially overlapping mating surface is provided, and the adhesive 2 is applied to the step portion.
And apply and fix it as a ferrite core.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to the shape of a ferrite magnetic core of a soft magnetic material used for transformers and coils.

[0002]

[Prior Art]

 As one shape of a transformer and a coil used in a conventional electronic circuit, there is a combination of a magnetic core 1 divided into two and a coil bobbin 8 around which a winding is wound, as shown in FIG. In order to fix the magnetic core made of a soft magnetic material that is divided into two parts, this type of transformer and coil are made by attaching the upper magnetic core 4 and the lower magnetic core 3 which are divided into two parts as shown in FIG. Adhesive 2 was applied to the side surface of the mating portion and solidified to fix the two-divided magnetic core. However, recently, in order to automate the mounting of this type of transformer and coil on the board, as shown in the perspective view of the transformer and coil assembly shown in FIG. 4, the plate-like magnetic core 4 is placed on the lower magnetic core 3 and the upper magnetic core is formed. When the horizontal width a1 and the vertical width b1 of the magnetic core are set slightly larger than the horizontal width a2 and the vertical width b2 of the lower magnetic core, when assembled as shown in FIG. The upper magnetic core and the lower magnetic core were fixed by the adhesive 2 using the step provided between the magnetic core and the magnetic core. In the conventional transformer and coil shown in FIGS. 3 and 4, the difference between the lateral width a1 of the upper magnetic core, the thickness c1 and the lateral width a2 of the lower magnetic core, the thickness c1 of the bonding space of the height c2, and the height c2, In addition, there is a drawback that the bonding position is displaced due to the difference in width.

[0003]

[Problems to be solved by the device]

 In order to eliminate these drawbacks, the present invention makes the outer diameter dimensions of the upper core core and the lower core core the same with each other, and the side surface on the core contact surface has a step difference on the magnet core contact surface. It is an object of the present invention to provide a ferrite magnetic core for a transformer or a coil, which is capable of fixing the bonding position without displacement of the butting surfaces of the upper magnetic core and the lower magnetic core by providing the.

[0004]

[Means for Solving the Problems]

 The present invention is a soft magnetic material having side butting surfaces of an upper magnetic core and a lower magnetic core, and a step in which the butting surface of the lower magnetic core and the upper magnetic core is in contact with each other on the butting surface. Thus, there is no displacement of the bonding position and the bonding boundary between the upper magnetic core and the lower magnetic core is long, so that the ferrite magnetic core has improved bonding strength. The outer dimensions of the lower magnetic core and the upper magnetic core are the same, so assembly is easy.

That is, the present invention is a ferrite that is composed of an upper magnetic core and a lower magnetic core each having a central magnetic leg and an outer magnetic leg, and a ferrite core that forms a transformer and a coil by combining a coil bobbin with the central magnetic leg. In the magnetic core, a step having a butting surface is provided between the outer magnetic core and the lower magnetic core on both outer sides, and an adhesive is applied to the step to divide the upper magnetic core and the lower magnetic core into two parts. It is a ferrite magnetic core characterized in that it is configured to.

[0006]

[Action]

 Although the upper and lower magnetic cores are combined and configured, the butting surfaces have the same dimensions, so positioning is easy, and the upper and lower magnetic cores are bonded together. On the abutting surface of the upper magnetic core and the lower magnetic core, a step is provided in which the surfaces abut on the abutting surface, and by adhering at the position of the step, the adhesive strength between the upper magnetic core and the lower magnetic core is increased, and Use a ferrite core that is easy to assemble with no difference in the dimensional position of the contact surface between the upper core and the lower core.

[0007]

【Example】

 Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a completed view of a transformer and a coil using a ferrite core according to the present invention. An upper magnetic core 5 has a step 6 on the side surface for applying and fixing an adhesive, and a lower magnetic core 7 and a combination coil bobbin 8 are provided. Is incorporated. The ferrite core according to the present invention has the same dimensions of the abutting portion of the upper magnetic core shown in FIG. 3, that is, the lateral width a1 and vertical width b1, and the lower magnetic core has lateral width a2 and vertical width b2. As shown in FIG. 2, in the stepped portion indicated by A in FIG. 1, the step depth l of the abutting portion of the upper magnetic core is shorter than the thickness d of the lower magnetic core, and the positioning is performed by the outer dimension of the magnetic core. At the time of contact, the contact surfaces of the upper and lower magnetic cores do not partially overlap due to the difference in level between the upper and lower magnetic cores. Therefore, when the adhesive is applied, the upper magnetic core and the lower magnetic core do not move. The bonding area becomes large, and the bonding strength between the upper magnetic core and the lower magnetic core becomes large. The size of the step provided at the abutting portion between the upper magnetic core and the lower magnetic core is 10% to 20% with respect to the length of the adhesive outer peripheral surface, and the total area of the abutting surface has a step difference. Even if it is attached, it is necessary to make it larger than the cross-sectional area of the central magnetic leg on which the coil bobbin 8 shown in FIG. 4 is assembled so as not to cause magnetic saturation. Although the embodiment of the present invention is shown as an example of an E-type and I-type ferrite magnetic core on the side surface, a so-called pot core having a circular outer diameter has the same structure as the ferrite magnetic core with a step of the present invention. Of course, it can be used as the ferrite magnetic core.

[Effect of the device]

 On the abutting surface of the outer magnetic leg that abuts the upper magnetic core and the lower magnetic core according to the present invention, a step is provided in which a part of the mating surface overlaps with the upper magnetic core, and the step is bonded using an adhesive, The outer dimensions of the upper magnetic core and the lower magnetic core can be made the same, and the joining by the step can provide a ferrite magnetic core for a transformer or a coil having stronger adhesive strength than the conventional one.

[Brief description of drawings]

FIG. 1 is an external perspective view showing a transformer and a coil incorporating a ferrite core of the present invention.

FIG. 2 is an enlarged perspective view of a stepped portion of a ferrite core of the present invention.

FIG. 3 is an exploded perspective view of a transformer and a coil incorporating a conventional ferrite magnetic core in which an upper magnetic core and a lower magnetic core having different outer dimensions are combined.

FIG. 4 is a perspective view showing completed assembly of the transformer and the coil shown in FIG.

FIG. 5 is an enlarged side view of the conventional transformer shown in FIG. 4, in which the butting surfaces of the upper magnetic core and the lower magnetic core of the coil are bonded together.

FIG. 6 is an external perspective view of a transformer and a coil in which a conventional two-divided magnetic core is combined.

[Explanation of symbols]

 1 magnetic core 2 adhesive 3 lower magnetic core 4 upper magnetic core 5 upper magnetic core 6 step 7 lower magnetic core 8 coil bobbin 9 central magnetic leg 10 outer magnetic leg

Claims (1)

[Scope of utility model registration request] 1. A ferrite magnetic core having a central magnetic leg and an outer magnetic leg, which is divided into an upper magnetic core and a lower magnetic core, and a coil bobbin is assembled to the central magnetic leg to form a transformer or coil. Then, a step having a butting surface is provided between the outer core and the lower core on both sides, and an adhesive is applied to the step to divide the upper core and the lower core into two parts. A ferrite magnetic core characterized by the above.