JP3503934B2 - Noise countermeasure transformer, coil with shield cover and shield cover for coil - Google Patents

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to various electronic devices, O
The present invention relates to a noise suppression transformer used in an A device, a coil with a shield cover thereof, and a coil shield cover.

[0002]

2. Description of the Related Art With the advent of the IT society, many information devices vulnerable to noise and lightning are inundated, and some measures are desired. By the way, in various semiconductor devices, OA devices, etc., which are averse to noise intrusion from power lines, external devices and the like, and noise radiation from itself, noise restaurants and the like are used as transformers for power supplies. As the transformer, the whole transformer or the outside of the coil portion is covered with a metal cover. Each coil is individually covered with a metal shield case (for example, JP-A-06-310316 and JP-A-06-120051). ) Etc.

[0003]

However, in any of the above cases, each coil requires a sufficient insulation treatment, which is troublesome. Further, the metal cover and the like occupy a considerable space factor, which causes inconvenience that the outer shape becomes large and heavy, and further, there are problems that the manufacturing is not easy and the cost is high. The present invention is intended to solve these problems, not only by attaching a shield cover to each coil, but also by providing the shield cover with an insulating function, to simplify the insulating process of each coil. , The entire structure is downsized, the weight is reduced, and the cost is reduced.

[0004]

From this point of view, the invention of the noise countermeasure transformer according to claim 1 is to provide each coil 1, 2
Insulating covers 3 conforming to the respective shapes are provided corresponding to the above, and conductive films 4 for electrostatic shield are attached to the surfaces of these covers to provide shield covers 5 for the coils 1 and 2 described above. Further, these shield covers are attached to the outsides of the respective coils 1 and 2 to form coils 6 and 7 with shield covers, and these coils with shield covers are fitted to the core 8. To do.

The invention of a coil with a shield cover for a noise suppression transformer according to a second aspect of the invention is to provide an insulating cover 3 conforming to each shape corresponding to each coil 1 and 2 and to the surface of each of these covers. A conductive coating 4 for electrostatic shield is additionally provided to provide a shield cover 5 for each of the coils 1 and 2 described above, and these shield covers are attached to the outside of each coil 1 and 2.

The invention of the coil shield cover of the noise countermeasure transformer according to claim 3 is to provide an insulating cover 3 conforming to each shape corresponding to each coil 1, 2 and statically covering the surfaces of these covers. A conductive coating 4 for electric shield is additionally provided.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments according to claim 1, claim 2 and claim 3 will be described below. Part 1. 1 to 3 show an embodiment, in which 1 is an input coil, 2 is an output coil, and 5 is a shield cover attached to these input coil and output coil. , 6 and 7 are coils with a shield cover, and 8 is a core into which these coils with a shield cover are fitted.

The shield cover 5 is formed by forming an insulating cover 3 corresponding to each shape corresponding to the input coil 1 and the output coil 2 by synthetic resin molding, and electrostatically shielding the surfaces of these insulating covers. The conductive film 4 is attached by metal plating, application of a conductive paint, or the like, and a narrow cut region 9 is formed in the conductive film 4 in a band shape so as to cut off an electrical short circuit in the coil direction. is doing. The cut area 9 can be easily formed, for example, by applying a masking tape in advance at a place for metal plating, applying a conductive paint, etc., and peeling it off later.

The insulative cover 3 has a cover main body 11 having a groove-shaped cross section with an endless loop having a window hole 10 into which a core 8 is inserted, and a lid 12 for closing the mouth of the cover main body. Which are obtained by synthetic resin molding such as injection molding. Then, the entire inner surface 13 of the cover body 11 and the window hole
The conductive film 4 for electrostatic shield is attached to the entire outer surface except the inner peripheral surface 14 of 10 and the entire inner surface 15 of the lid 12.
In addition, in the insulating cover 3 shown in FIGS.
Although it has a brim shape (flat plate shape), it may be formed in a cap shape corresponding to the cover body 11.

The above-mentioned shield cover 5 is attached to the outside of the input coil 1 and the output coil 2 by the insulating cover 3, that is, the cover body 11 and the lid 12.
In this case, the input coil 1 and the output coil 2 may be subjected to a very simple insulation treatment such as wrapping an insulating tape around the outer periphery, and the attached insulating cover 3 is required for each coil 1, 2. To ensure the insulation performance of.

The coils 6 and 7 with the shield cover relating to the input coil 1 and the output coil 2 thus formed are butted against each other via the insulating paper 16 on the side of the lid 12, and the core 8 is formed in each window hole 10. To fit.

Then, each coil 6 with a shield cover,
In each of the shield covers 5 of the input coil 1 and the output coil 2, 7 is a surface of the insulating cover 3 while the insulating cover 3 attached to the coil exerts a required insulating function of the coils 1 and 2. The conductive film 4 attached to the coil exerts the electrostatic shield function of each coil. The insulating paper 16 interposed between the shield covers 5 prevents an electrical short circuit in the coil direction that may occur when the shield covers 5 are butted.

2. 4 to 6 show another embodiment. In this case, it is substantially the same as the above-mentioned first embodiment, but only the form of the shield cover 5 is different. That is, the shape of the above-mentioned insulating cover 3 formed by synthetic resin has a pair of vertically symmetrical half bodies 17 in the figure.
And, both are also the cover body 11 described above and the lid body
It is made of two bodies of the same shape which are also 12 and is made to butt against each other to form an integral insulating cover 3. Each half body 17 has a metal plating and a conductive paint on its surface. A shield cover 5 is formed by attaching a conductive coating 4 for electrostatic shield by coating or the like and forming a narrow cut region 9 in a strip shape on the conductive coating 4 for cutting an electrical short circuit in the coil direction. ing. By doing so, the mold of the half body 17 is sufficient for the synthetic resin molding of the insulating cover 3, and the molding cost can be reduced.

The shield cover 5 thus constructed is attached to the input coil 1 and the output coil 2 with the pair of half bodies 17 which are the insulating covers 3. At this time, the butted half bodies 17 are insulated from each other. Adhesive adhesive or the like, or integrated by attaching an insulating adhesive tape to the outer periphery. It should be noted that the engaging ridges and the engaging recesses may be appropriately arranged on the halves 17 to be abutted, so that the halves 17 are integrally engaged with each other.

Since the other contents are the same as those of the above-mentioned first embodiment, the description thereof will be omitted.

[0016]

As described above, according to the present invention, the shield cover 5 is formed by attaching the conductive film 4 for electrostatic shield to the surface of the insulating cover 3 which is suitable for the coils 1 and 2. For each coil 1 and 2 in the cover, the insulating cover 3 can sufficiently secure the required insulation performance, and
The conductive film 4 can ensure the required electrostatic shield performance and can exert two functions simultaneously and accurately. Therefore, the insulation treatment of each coil 1 and 2 can be achieved by winding an insulating tape around the outer circumference of the coil. It suffices to perform a very simple pretreatment such as, which greatly simplifies the insulation treatment and reduces the labor. The shield cover 5 can not only be easily formed by molding the insulating cover 3 by synthetic resin molding, but the conductive film 4 can also be easily attached by metal plating, application to a conductive paint, or the like. In this way, the shield cover 5 can be used both as the insulating means and the shield means, and can be formed of a light material. In addition, the shield cover 5 can be used for each coil 1,
Since it is formed in conformity with the shape of No. 2, it is possible to reduce the size and weight of not only the coils 6 and 7 with the shield cover but also the transformer as a whole, and it is possible to easily manufacture and reduce the cost as a whole. Further, by making the insulating cover 3 of the shield cover 5 a synthetic resin molded product having a small number of joints, it is possible to exhibit the performance as a high voltage transformer having a high withstand voltage.

[Brief description of drawings]

FIG. 1 is a perspective view showing an embodiment of a noise suppression transformer of the present invention.

FIG. 2 is a perspective view showing a coil with a shield cover and a coil shield cover of the noise suppression transformer.

FIG. 3 is a partially cutaway exploded perspective view showing a coil with a shield cover and a coil shield cover of the noise suppression transformer.

FIG. 4 is a perspective view showing another embodiment of the noise suppression transformer of the present invention.

FIG. 5 is a perspective view showing a coil with a shield cover and a coil shield cover of the noise suppression transformer.

FIG. 6 is a partially cutaway exploded perspective view showing a coil with a shield cover and a coil shield cover of the noise suppression transformer.

[Explanation of symbols]

1 ... Input coil 2 ... Output coil 3 ... Insulating cover 4 ... Conductive film 5 ... Shield cover 6 ... Shield cover coil 7 ... Shield cover coil 8 ... Core 9 ... Cut area 10 ... Window hole 11 ... Cover body 12 … Lid 13… All inner surface of cover 14… Inner surface of window 15… All inner surface of lid 16… Insulating paper 17… Half body

─────────────────────────────────────────────────── --- Continuation of the front page (56) References JP-A-6-290978 (JP, A) JP-A-11-204352 (JP, A) JP-A-4-236408 (JP, A) JP-A-60- 198711 (JP, A) JP-A-6-45162 (JP, A) Actually opened 55-169821 (JP, U) Actually opened 57-55922 (JP, U) Actually opened 63-140695 (JP, U) Actual development Sho 60-169824 (JP, U) Actual development Sho 61-112620 (JP, U) Actual development Sho 61-81117 (JP, U) (58) Fields investigated (Int.Cl. ⁷ , DB name) H01F 27/02 H01F 27/36 H05K 9/00

Claims (3)

(57) [Claims] 1. An insulating cover 3 adapted to each shape is provided corresponding to each coil 1, 2, and a conductive coating 4 for electrostatic shield is attached to the surface of each of these coils to form each coil. The shield covers 5 for 1 and 2 are provided, and these shield covers are provided for the respective coils 1,
Coils 6 and 7 with a shield cover attached to the outside of 2
Forming a coil with these shield covers
A noise countermeasure transformer characterized by being fitted to. 2. The coils 1 and 2 are provided with insulating covers 3 conforming to their respective shapes, and electrostatic shield conductive films 4 are attached to the surfaces of these covers, respectively. The shield covers 5 for 1 and 2 are provided, and these shield covers are provided for the respective coils 1,
A coil with a shield cover for a noise suppression transformer that is attached to the outside of 2. 3. A noise countermeasure transformer comprising an insulating cover 3 conforming to each shape corresponding to each coil 1, 2 and an electrostatic shield conductive film 4 attached to the surface of each cover. Shield cover for coil.