KR102408962B1 - Manufacturing method for wireless charging coil and wireless charging coil manufactured by the same - Google Patents

Abstract

The present invention relates to a method for manufacturing a wireless charging coil that can minimize the gap between coil strands and realize coil integration by precisely laminating two parallel coil patterns constituting a bifilar coil using a UV film, (a ) forming an even coil pattern and an odd coil pattern in which a coil is fixed by a fixing bar of a dummy; (b) attaching a UV film to one surface of the even coil pattern and the odd coil pattern, respectively, and laminating; (c) removing the fixing bar from the coil pattern to which the UV film is attached; (d) making the combined coil into a bifilar form by combining the other surfaces of the even coil pattern having a UV film attached to one surface and the odd coil pattern having a UV film attached to one surface facing each other; and (e) removing the UV films on both sides from the combined odd coil pattern and even coil pattern and attaching a coverlay to one surface of the combined pattern; It is characterized in that it includes.

Description

Manufacturing method of a wireless charging coil and a wireless charging coil manufactured by the manufacturing method

The present invention relates to a method of manufacturing a wireless charging coil and a wireless charging coil manufactured by the manufacturing method, and more particularly, by using a UV film to elaborately laminating two parallel coil patterns constituting a bifilar coil. It relates to a method of manufacturing a wireless charging coil capable of implementing the minimization of the spacing between strands and integration of the coil, and a wireless charging coil manufactured by the manufacturing method.

With the development of wireless communication technology, interest in wireless power transmission/reception technology for wirelessly supplying power to electronic devices is increasing. This wireless power transmission/reception technology can be variously applied not only to charging a battery of a portable terminal, but also to supplying power to home electronic products, and supplying power to electric vehicles or subways.

The wireless power transmission/reception technology uses the principle of magnetic induction or magnetic resonance. The wireless power transmitter wirelessly transmits power to the wireless power receiver using the principle of magnetic induction or magnetic resonance. Here, the antenna of the wireless power transceiver may include a metal substrate, a soft magnetic sheet disposed on the metal substrate, and a coil disposed on the soft magnetic sheet.

Recently, in order to increase power transmission/reception efficiency, a bi-pillar coil comprising two parallel coil strands adjacent to each other has been adopted as a power transmission/reception coil. For such a bifilar coil, making the coil strands as thin as possible and arranging the coil strands with a narrow gap between the strands is the most important for power transmission/reception efficiency.

Conventionally, in order to manufacture a bifilar coil for power transmission/reception, a method of adhering the coil to a film on which the coil is disposed with a separate adhesive interposed therebetween has been used. Such a conventional coil manufacturing method is suitable for allowing a coil having a thin, parallel relationship and a fine distance from each other to be easily fixed to the film, but it is necessary to maintain the thin coil strand and the fine distance between the strands accurately. It was difficult to handle during the process, so there was a limit to its integration and miniaturization.

The present invention has been devised to solve the above problems, and its purpose is to minimize the gap between the coil strands and to integrate the coils by precisely laminating two parallel coil patterns constituting the bifilar coil using a UV film. To provide a method of manufacturing a wireless charging coil that can be implemented and a wireless charging coil manufactured by the manufacturing method.

According to the present invention, the method comprising: (a) forming an even coil pattern and an odd coil pattern in which a coil is fixed by a fixing bar of a dummy; (b) attaching a UV film to one surface of the even coil pattern and the odd coil pattern, respectively, and laminating; (c) removing the fixing bar from the coil pattern to which the UV film is attached; (d) making the combined coil into a bifilar form by combining the other surfaces of the even coil pattern having a UV film attached to one surface and the odd coil pattern having a UV film attached to one surface facing each other; and (e) removing the UV films on both sides from the combined odd coil pattern and even coil pattern and attaching a coverlay to one surface of the combined pattern; It provides a method of manufacturing a wireless charging coil comprising a.

Preferably, in step (a), the even coil pattern and the odd coil pattern include a flat coil, and a spaced space exists between the coil strands wound in the coil and the coil strands, and the even coil It is characterized in that the coil strands of the Odd coil are positioned in the spaced space between the windings and the coil strands of the Even coil are positioned in the spaced space between the windings of the Odd coil.

Preferably, the initial adhesive strength of the UV film in step (b) is 1,800 gf/25mm±10%, and the late adhesive strength cured by UV irradiation is 20gf/25mm±20%.

Preferably, in the step (c), the fixing bar is punched out and removed by a pressing process, and the even coil and the odd coil are attached to the coil and the dummy and maintained in the pattern plane by the laminated UV film. do it with

Preferably, in step (d), when the even coil pattern and the odd coil pattern are combined, the coil region is pressed from one side to place the coil strands of the odd coil in the space between the windings of the even coil on one plane, and the It is characterized in that the coil strands of the even coil are positioned in the space between the windings.

Preferably, the step (e) comprises the steps of: (e-1) curing and removing the UV film attached to the outer surface of one side by irradiating UV to one surface of the combined odd coil pattern and the even coil pattern; (e-2) disposing a coverlay having a built-in cover on the upper side of the coil from which the UV film is removed, and fixing the coverlay to the upper side of the coil from which the UV film is removed by high-temperature compression; and (e-3) curing and removing the UV film on the other outer surface by irradiating UV to the other surface of the combined odd coil pattern and the even coil pattern; It is characterized in that it includes.

Preferably, after step (e), (f) removes the coverlay leaving only the cover supporting the combined coil in the combined odd coil pattern and the even coil pattern, and also removes the dummy remaining on the outside of the combined coil removing and commercializing; It is characterized in that it further comprises.

Meanwhile, according to another aspect of the present invention, as manufactured by the method of manufacturing a wireless charging coil according to any one of the above-described features, it is composed of an even coil and an odd coil in which a coil strand is wound a plurality of times, The coil strands of the Odd coil are located in the space between the windings, and the coil strands of the Odd coil are located in the space between the windings of the Odd coil, and the even coil and the coil strands of the Odd coil are closely located but not in contact with each other. A wireless charging coil is provided.

According to the present invention, by using a UV film to precisely laminate two parallel coil patterns constituting a bifilar coil, it is possible to minimize the gap between the coil strands and realize the integration of the coil.

1 is a process flow diagram for explaining a method of manufacturing a wireless charging coil according to an embodiment of the present invention.
2 is a view for explaining an even coil pattern and an odd coil pattern of a wireless charging coil according to an embodiment of the present invention.
3 is a view for explaining a process of attaching a UV film to a coil pattern according to an embodiment of the present invention.
4 is a view for explaining a fixing bar removal process according to an embodiment of the present invention.
5 is a view for explaining a process of combining an even coil pattern and an odd coil pattern according to an embodiment of the present invention.
6 is a view for explaining a process of combining an even coil pattern and an odd coil pattern according to an embodiment of the present invention.
7 is a view for explaining a process of removing the UV film and fixing the coverlay according to an embodiment of the present invention.
8 is a view for explaining a process of attaching a coverlay to a coil pattern according to an embodiment of the present invention.
9 is a view for explaining a post-work process according to an embodiment of the present invention.
10 is a view for explaining a wireless charging coil commercialized according to an embodiment of the present invention.

Since the present invention can have various changes and can have various embodiments, specific embodiments are illustrated in the drawings and described in detail in the detailed description. However, this is not intended to limit the present invention to specific embodiments, and it should be understood to include all modifications, equivalents and substitutes included in the spirit and scope of the present invention. In describing each figure, like reference numerals have been used for like elements.

Terms such as first, second, A, and B may be used to describe various elements, but the elements should not be limited by the terms. The above terms are used only for the purpose of distinguishing one component from another. For example, without departing from the scope of the present invention, a first component may be referred to as a second component, and similarly, a second component may also be referred to as a first component. and/or includes a combination of a plurality of related listed items or any of a plurality of related listed items.

When an element is referred to as being “connected” or “connected” to another element, it is understood that it may be directly connected or connected to the other element, but other elements may exist in between. it should be On the other hand, when it is said that a certain element is "directly connected" or "directly connected" to another element, it should be understood that the other element does not exist in the middle.

The terms used in the present application are only used to describe specific embodiments, and are not intended to limit the present invention. The singular expression includes the plural expression unless the context clearly dictates otherwise. In the present application, terms such as “comprise” or “have” are intended to designate that a feature, number, step, operation, component, part, or combination thereof described in the specification exists, but one or more other features It should be understood that this does not preclude the existence or addition of numbers, steps, operations, components, parts, or combinations thereof.

Unless defined otherwise, all terms used herein, including technical and scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Terms such as those defined in commonly used dictionaries should be interpreted as having a meaning consistent with the meaning in the context of the related art, and should not be interpreted in an ideal or excessively formal meaning unless explicitly defined in the present application. does not

Hereinafter, preferred embodiments according to the present invention will be described in detail with reference to the accompanying drawings.

1 is a process flow diagram for explaining a method of manufacturing a wireless charging coil according to an embodiment of the present invention.

In the method for manufacturing a wireless charging coil according to the present invention, an Even coil pattern 100 and an Odd coil pattern 200 are first formed, and the UV films 130 and 230 are attached thereto, respectively. After this, by removing the outer UV films 130 and 230 from the combined pattern, a bifilar type wireless charging coil is formed.

The specific form of the coil pattern described and shown below is merely an example, and it is said that any form of a coil pattern capable of wireless charging according to the present invention is possible in addition to the form shown.

First, in the first process ( S10 ), the even coil pattern 100 and the odd coil pattern 200 are formed.

The even coil pattern 100 is illustrated in FIG. 2A , and the odd coil pattern 200 is illustrated in FIG. 2A .

The even coil pattern 100 and the odd coil pattern 200 are flat coils, and the coil strands are wound a plurality of times to have the same shape in which the even coil 110 and the odd coil 210 are formed, and are circular and oval. Alternatively, the coil strands may be wound in a clockwise or counterclockwise direction to have a rectangular shape.

In addition, a spaced apart space exists between the coil strands wound in the even coil 110 and the odd coil 210 and the coil strand, and the spaced space between the windings of the even coil 110 is the coil of the odd coil 210 . The strands are positioned and the coil strands of the even coil 110 are positioned in the space between the windings of the Odd coil 210 to configure a bi-piler type wireless charging coil. At this time, the coil strands of the even coil 110 and the odd coil 210 are closely located but do not contact each other.

Here, the even coil pattern 100 and the odd coil pattern 200 may be formed by an etching process or a pressing process using a metal sheet as a material, and the even coil 110 and the odd coil pattern 210 ), the even coil 110 and the odd coil 210 are supported by being connected to the fixing bars 130 and 230 connected to the external dummy 120 and 220 in order to maintain the wound shape. This metal sheet may be any of a variety of materials suitable for wireless power transfer (eg, copper, copper alloy, aluminum, aluminum alloy, etc.).

Next, in the second process (S20), the UV films 140 and 240 are attached to one surface of the even coil pattern 100 and the odd coil pattern 200, respectively.

3 is a view for explaining a process of attaching a UV film to a coil pattern according to an embodiment of the present invention.

Referring to FIG. 3 , after positioning the coil patterns 100 and 200 on the film attaching jig 300 so that one surface is exposed upward (refer to FIG. 3 (a)), the exposed coil patterns 100 and 200 The UV films 140 and 240 are disposed on one surface (see (b) of FIG. 3), and the UV films 140 and 240 are attached to the coil patterns 100 and 200 to be laminated (FIG. 3(c)). ) Reference).

The UV films 140 and 240 are adhesives in the form of polymer films that are cured by irradiation with ultraviolet (Ultraviolet, UV). Such UV films 140 and 240 should exhibit high adhesion before UV irradiation and have properties that the adhesion should be significantly reduced after UV irradiation, and after peeling, transfer of the adhesive to the coil patterns 100 and 200 it shouldn't happen

The initial adhesive strength of the UV films 140 and 240 according to an embodiment of the present invention may be 1,800 gf/25mm±10%, and the thickness of the fabric, adhesive strength, and adhesive thickness may be determined according to the precision or planar area of the coil patterns 100 and 200. Changes are also possible. After UV irradiation of the UV irradiator 500, the late adhesive strength of the UV films 140 and 240 may be 20gf/25mm±20%.

The UV films 140 and 240 maintain the wound shape of the coil patterns 100 and 200 due to the initial adhesive force, and when the fixing bars 130 and 230 are removed, which is a post-process, the coil patterns 100 and 200 are formed. will keep its shape.

Therefore, rather than attaching the UV films 140 and 240 to the entire surface of the coil patterns 100 and 200, as shown in FIG. It will be efficient in the process to attach only a partial area of (120, 220).

Next, in the third process (S30), the fixing bars 130 and 230 are removed by pressing the coil patterns 100 and 200 to which the UV films 140 and 240 are attached with a press mold.

4 is a view for explaining a fixing bar removal process according to an embodiment of the present invention.

Referring to FIG. 4 , only the fixing bars 130 and 230 are punched out from the coil patterns 100 and 200 by the pressing process and removed (refer to the dotted line). The coil 110 or the odd coil 210 will lose a direct connection relationship with the dummy 120 and 220 . Accordingly, the planar structure of the coil patterns 100 and 200 and the dummy 120 and 220 will be maintained by the UV films 140 and 240 .

Next, in the fourth process (S40), the even coil pattern 100 having a UV film 140 attached to one surface and the odd coil pattern 200 having a UV film 240 attached to one surface are combined in a state facing each other will make it

5 is a view for explaining a process of combining an even coil pattern and an odd coil pattern according to an embodiment of the present invention.

Referring to FIG. 5 , an even coil pattern 100 having a UV film 140 attached to one side of the odd coil pattern 200 having a UV film 240 attached to one side is in a state where the UV film 240 is facing downward. ) placed on the Odd coil pattern 200 with the UV film 140 facing upward (see (a) of FIG. 5), placed on the pattern combining jig 500, and then pressed downward (in FIG. (refer to (b)), the odd coil pattern 200 and the even coil pattern 100 are combined (refer to (c) of FIG. 5).

Here, the vertical arrangement structure of the odd coil pattern 200 and the even coil pattern 100 is of course also possible in the reverse of the above description.

6 is a view for explaining a process of combining an even coil pattern and an odd coil pattern according to an embodiment of the present invention.

6 (a) shows the even coil pattern 100 to which the UV film 140 is attached, and the UV film 140 is disposed upward.

Also, in (b) of FIG. 6 , the odd coil pattern 200 to which the UV film 240 is attached is shown, and the UV film 240 is disposed downward.

And by overlapping the two patterns as shown in (c) of FIG. 6, and pressing and pressing with a pattern coupling jig 500 as shown in FIG. 6 (d), the odd coil pattern 200 and the even coil pattern 100 are combined This is made, the coil strands of the Odd coil 210 are positioned in the space between the windings of the even coil 110, and the coil strands of the even coil 110 are positioned in the space between the windings of the Odd coil 210, so that the bi A filer shape can be achieved.

Next, in a fifth process (S50), the UV films 140 and 240 on both sides are removed from the combined Odd coil pattern 200 and the even coil pattern 100, and the combined Odd coil pattern 200 and the even coil pattern 100 are removed. The coverlay 300 is attached to one surface of the pattern 100 .

7 is a view for explaining a process of removing the UV film and fixing the coverlay according to an embodiment of the present invention.

First, as shown in (a) of Figure 7a, by irradiating UV on one surface of the combined Odd coil pattern 200 and the even coil pattern 100 with a UV irradiator 600 to the outer surface of the even coil pattern 100 The attached UV film 140 is cured.

The UV film 140 and the dummy 120 connected thereto having a later adhesive strength (20gf/25mm±20%) weakened compared to the initial adhesive strength (1,800gf/25mm±10%) by the curing of the UV film 140 . is removed (refer to (b) of FIG. 7A).

Thereafter, as shown in (c) of FIG. 7A , a coverlay 300 having a cover 210 embedded therein is disposed on the upper side of the coils 110 and 210 from which the UV film 140 is removed, and a hot press 700 is performed. ) to fix the coverlay 300 on the upper side of the coils 110 and 210 from which the UV film 140 is removed (see (d) of FIG. 7a).

Referring to FIG. 8 , the coverlay 300 has a built-in cover 210 for fixing the coils 110 and 210 (see (a) of FIG. 8 ), in a position of the coils 110 and 210 . The cover 210 is fixed by high-temperature compression so that it is positioned (refer to (b) of FIG. 8).

And this time, the UV film 240 attached to the outer surface of the Aude coil pattern 200 is cured by irradiating UV with a UV irradiator 600 to the other surface of the combined Odd coil pattern 200 and the even coil pattern 100 . (see Fig. 7b (e)).

By curing the UV film 240, the UV film 240 having a weakened late adhesive strength (20gf/25mm±20%) compared to the initial adhesive strength (1,800 gf/25mm±10%) is removed ( FIG. 7b ). of (f)).

In the process of removing the UV film and fixing the coverlay described above with reference to FIG. 7 , the UV film 140 attached to the outer surface of the odd-even coil pattern 100 is first removed, and the coverlay 300 is placed there, and then Although it has been described as removing the UV film 240 attached to the outer surface of the Aude coil pattern 200, in reverse, the UV film 240 attached to the outer surface of the Aude coil pattern 200 is first removed and a coverlay Of course, it is also possible to remove the UV film 140 attached to the outer surface of the even coil pattern 100 after disposing the 300 .

Next, in the sixth process (S60), the coverlay 300 is removed, leaving only the cover 310 supporting the coils 110 and 210 combined in the combined odd coil pattern 200 and the even coil pattern 100. In addition, a post-process of commercializing by removing the dummy 220 or 120 remaining on the outside of the combined coils 110 and 210 is performed.

Such a post-process is sequentially performed as a coverlay 300 removal process and a dummy 220 or 120 removal process.

Referring to Figure 9 (a), in the coverlay 300 removal process, the coverlay 300 for providing the cover 310 while leaving the cover 310 supporting the coupled coils 110 and 210 . will be removed Also, referring to FIG. 9B , all of the dummy 220 or 120 remaining on the outside is removed while the cover 310 supporting the coupled coils 110 and 210 is present.

Accordingly, a commercialized wireless charging coil is shown in FIG. 10 .

The cover 310 is disposed on the back side of the commercialized wireless charging coil, and the coils 110 and 210 coupled to the cover 310 in a bifilar form are disposed on the front side.

As described above, the best embodiment has been disclosed in the drawings and the specification. Although specific terms have been used herein, they are only used for the purpose of describing the present invention and are not used to limit the meaning or the scope of the present invention described in the claims. Therefore, it will be understood by those of ordinary skill in the art that various modifications and equivalent other embodiments are possible therefrom. Therefore, the true technical protection scope of the present invention should be determined by the technical spirit of the appended claims.

100: even coil pattern 110: even coil
120: dummy 130: fixed bar
140: UV film 200: odd coil pattern
210: odd coil 220: dummy
230: fixed bar 240: UV film
300: coverlay 310: cover
400: film attaching jig 500: pattern combining jig
600: UV irradiator 700: hot press

Claims (8)

(a) forming an even coil pattern and an odd coil pattern in which a coil is fixed by a fixing bar of a dummy;
(b) attaching a UV film to one surface of the even coil pattern and the odd coil pattern, respectively, and laminating;
(c) removing the fixing bar from the even coil pattern and the odd coil pattern to which the UV film is attached, respectively;
(d) making the combined coil into a bifilar shape by combining the other surfaces of the even coil pattern having a UV film attached to one surface and the odd coil pattern having a UV film attached to one surface facing each other; and
(e) removing the UV films on both sides from the combined odd coil pattern and even coil pattern and attaching a coverlay to one surface of the combined pattern; A method of manufacturing a wireless charging coil comprising a.
The method of claim 1,
In step (a),
The even coil pattern and the odd coil pattern include a flat coil, and a spaced space exists between the coil strands wound and the coil strand of the coil, and the spaced space between the windings of the even coil includes the coil strands of the odd coil A method of manufacturing a wireless charging coil, characterized in that the coil strands of the even coil are positioned in the spaced space between the windings of the Odd coil.
The method of claim 1,
The initial adhesive force of the UV film of step (b) is 1,800 gf/25mm±10%, and the late adhesive force cured by UV irradiation is 20gf/25mm±20%. Method of manufacturing a wireless charging coil.
The method of claim 1,
In step (c),
The fixing bar is punched out and removed by a pressing process, and the even coil and the odd coil are attached to the coil and the dummy and are maintained in a pattern plane by the laminated UV film.
The method of claim 1,
In step (d),
When the even coil pattern and the odd coil pattern are combined, the coil area is pressed from one side so that the coil strands of the odd coil are located in the space between the windings of the even coil on one plane, and the coil strands of the even coil are located in the space between the windings of the odd coil on one plane. A method of manufacturing a wireless charging coil, characterized in that it is made to be positioned.
The method of claim 1,
Step (e) is,
(e-1) curing and removing the UV film attached to the outer surface of one side by irradiating UV on one surface of the combined Odd coil pattern and the even coil pattern;
(e-2) disposing a coverlay having a built-in cover on the upper side of the coil from which the UV film is removed, and fixing the coverlay to the upper side of the coil from which the UV film is removed by high-temperature compression; and
(e-3) curing and removing the UV film on the other outer surface by irradiating UV to the other surface of the combined odd coil pattern and the even coil pattern; A method of manufacturing a wireless charging coil comprising a.
The method of claim 1,
After step (e),
(f) removing the coverlay leaving only the cover supporting the coils coupled in the combined odd coil pattern and the even coil pattern, and also removing the dummy remaining on the outside of the combined coil to commercialize; Method of manufacturing a wireless charging coil, characterized in that it further comprises.
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