KR102322206B1 - Method of manufacturing antenna sheet using wire embedding and antenna sheet thereof - Google Patents

Abstract

A method for manufacturing an antenna sheet including a wire antenna formed through wire embedding comprises: a step of providing a substrate including at least one damping slit formed adjacent to a location for the wire antenna to be formed; and a step of embedding a wire to pass adjacent to the damping slit. The present invention can prevent the antenna sheet from being deformed or crumpled even in case of repeatedly embedding a multi wire and the like in a spiral form using the damping slit.

Description

Manufacturing method of antenna sheet using wire embedding and antenna sheet resulting therefrom

The present invention relates to a wire embedding or inlay antenna sheet, and more particularly, to a method of forming an antenna sheet capable of preventing the sheet from being wrinkled when a wire antenna is formed by embedding a wire, and an antenna sheet resulting therefrom.

As mobile devices become more popular in modern society, technologies for wirelessly performing data communication with peripheral devices or charging batteries are also evolving. The NFC function has become an essential function in smartphones and has gone beyond the wired charging method that was generally used in the past.

A mobile device for performing such a purpose is equipped with a transmission/reception module capable of transmitting and receiving signals as well as energy, and an antenna having a coil structure may be used in the transmission/reception module. For these antennas, winding a copper wire was a common technique in the past, but as technology advances, a copper thin film is formed on an FPCB for a thin antenna structure and removed by chemical etching or laser etching to form a fine antenna pattern. became

However, the technique of etching the copper thin film has to go through many pre-treatment and post-treatment processes to form a pattern, and the problem of environmental pollution due to the chemicals used in the etching is being discussed.

In addition, the existing technology using a wire is insufficient to form a thin structure, and since it basically forms a single wire structure, it is necessary to solve problems such as an increase in resistance due to a long coil wire, interference of a signal, and a problem caused by a wire break. .

In order to solve this problem, Patent Publication No. 2003-0040243 discloses a technique for embedding a coil using ultrasonic waves. When the ultrasonic wave is used, a coil is partially embedded in a substrate made of a thermoplastic or thermally combustible material. However, even in the above technique, a spiral portion is formed while forming a coil, and as the ultrasonic horn forming the spiral portion approaches the center, the antenna sheet may be wrinkled or the deformation may be gradually accumulated.

Such deformation may be an obstacle to making the inner diameter of the wire antenna narrower, and the overall wrinkling of the antenna sheet provides difficulty in thinning the thickness. This difficulty may appear more conspicuous in the case of embedding multi-wire or multiple wires in parallel than in the case of embedding the single-wire wire.

The present invention provides a method of manufacturing an antenna sheet capable of preventing the antenna sheet from being crumpled or deformed in the process of embedding a wire, and an antenna sheet resulting therefrom.

The present invention provides a method for manufacturing an antenna sheet capable of preventing deformation of an antenna even when two or more wires are embedded in parallel, and an antenna sheet resulting therefrom.

The present invention provides a method of manufacturing an antenna sheet capable of further improving problems that may occur even when a damping slit is formed, and an antenna sheet resulting therefrom.

According to an exemplary embodiment of the present invention for achieving the above-described objects of the present invention, the method for manufacturing an antenna sheet including a wire antenna formed through wire embedding is at least formed adjacent to the position where the wire antenna is to be formed. A method comprising: providing a substrate including one damping slit; and embedding a wire so as to pass adjacently through the damping slit; It can prevent wrinkling or deformation.

The damping slits may be formed in various positions on the substrate, but if they are formed in too many places, it may be difficult to manage the antenna sheet, so it may be desirable to form the damping slits in an appropriate number and distribution. For example, in the case of a wire antenna, it includes a spiral portion formed in a spiral shape while maintaining a circular, elliptical, square, or other polygonal shape. It is preferable to form

At this time, the damping slit may be formed in various shapes, such as a round hole, a square hole, a hexagonal hole, a straight line, a radial straight line, a curved line, a zigzag, etc., in the center of or around the spiral part, and may be formed by a combination thereof.

In some cases, just forming the damping slit may not be sufficient. This is because the antenna sheet may be partially moved by the damping slit while ultrasonic waves are transmitted through ultrasonic welding or the like. In order to solve this problem, the wire may be embedded in a state in which the substrate is temporarily fixed to the base that provides the adsorption force. In order to fix the substrate to the base, negative pressure may be formed in the base to temporarily fix the substrate.

For example, the base may form a suction plate using a porous material having an average pore size of 5 to 40 μm, and it may be preferable to use a suction plate having a porosity of 60% or less for the negative pressure formation by the base.

According to an exemplary embodiment of the present invention for achieving the objects of the present invention described above, an antenna sheet for responding to a change in a surrounding electromagnetic field is a substrate, a wire antenna composed of a wire embedded in the substrate, and adjacent to the wire antenna It may include at least one damping slit formed to

The damping slit may be formed adjacent to the center of the spiral portion of the wire antenna, and the damping slit may be formed in the shape of a hole, a straight line, a curve, or a combination thereof, and the wire antenna is formed using a single wire or multiple parallel wires. can be In this embodiment, multiple may theoretically mean two or more, and may preferably be understood as three or more.

According to the antenna manufacturing method of the present invention, it is possible to prevent the antenna sheet from being crumpled or deformed in the process of embedding the wire by the damping slot.

In particular, when two or more wires are buried in parallel, this deformation may be noticeable, and such deformation can be effectively prevented by using a damping slot.

In some cases, the damping slit alone may be insufficient, and this problem can be fixed and corrected while the antenna sheet is deformed by using a vacuum chuck base that forms an adsorption force with vacuum and ultrasonic welding on the base.

Even in this case, by using a porous suction plate having pores of about 5 to 40 μm, effective temporary fixation may be possible without interfering with fusion.

1 is a view for explaining an antenna sheet and applicable mobile devices according to an embodiment of the present invention.
2 is a view for explaining the structure of the antenna sheet according to an embodiment of the present invention.
3 to 7 are views for explaining a method of manufacturing an antenna sheet or equipment used for manufacturing according to an embodiment of the present invention.
8 is a view for explaining a connection between a wire and a terminal in the antenna sheet according to an embodiment of the present invention.
9 is a view for explaining a cross section AA′ of FIG. 8 .

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings, but the present invention is not limited or limited by the embodiments. For reference, in the present description, the same numbers refer to substantially the same elements, and contents described in other drawings under the above rules may be cited and described, and contents determined to be obvious to those skilled in the art or repeated may be omitted.

Figure 1 is a view for explaining the antenna sheet and applicable mobile devices according to an embodiment of the present invention, Figure 2 is a view for explaining the structure of the antenna sheet according to an embodiment of the present invention, Figures 3 to 7 is a view for explaining a method of manufacturing an antenna sheet or equipment used for manufacturing according to an embodiment of the present invention.

1 to 7 , the antenna sheet 100 according to the present embodiment may be mounted inside the mobile device 1, and may perform wireless charging, signal transmission/reception, etc. in response to external devices. . Assuming that the display surface of the mobile device 1 in the drawing is the top surface, the antenna sheet 100 is installed inside the mobile device 1 , and more specifically, adjacent to the bottom surface of the mobile device 1 . can be located

The antenna sheet 100 is intended to respond to changes in the surrounding electromagnetic field, and may be used as a medium for various wireless charging, signal transmission and reception, such as wireless charging, short-range communication, and magnetic security communication. In response to this function, the antenna sheet 100 according to the present embodiment includes a multi-wire antenna 130 for wireless charging, a short-range communication antenna 140 for non-contact short-range communication, and a magnetic security antenna 150 for payment. may include

The multi-wire antenna 130 , the short-range communication antenna 140 , and the magnetic security antenna 150 may be connected one-to-one to the terminals 120 of the connection circuit sheet 170 .

The illustrated antenna sheet 100 includes the substrate 110 in which the antenna is embedded, and may also include a connection circuit sheet 170 such as an FPCB, and although not shown, the substrate 110 and the connection circuit sheet. It may further include a shielding sheet and a cushion sheet stacked up and down of 170 .

The substrate 110 may be formed of a material such as PET or PC, and three or more parallel wires 132 or single wires 142 and 152 may be embedded on one surface using ultrasonic welding or thermal welding. have. In this embodiment, the parallel wires 132 forming the multi-wire antenna 130 are formed in five layers.

Terminals 120 are arranged at an end of the connection circuit sheet 170 at a position adjacent to the substrate 110 , and a connection unit or an integrated circuit chip that can be connected to a main device or the like may be mounted on the opposite side.

A wire antenna 130 made of five parallel wires 132 may be formed on the substrate 110 , and in the center of the spiral portion of the wire antenna 130 , a first damping slit 114 in the shape of a circular hole and a first A second damping slit 116 having a linear shape radially formed around the damping slit 114 may be formed.

Hereinafter, a process of forming the antenna sheet 100 according to an embodiment may be described.

Referring to FIG. 3 , the original plate 111 may be provided as a form prior to forming the substrate 110 of the antenna sheet 100 . The original plate 111 may be provided with a material that can be thermally deformed, such as PET or PC, and an exposure hole 112 is formed at one side of the original plate 111 .

In addition, a circular first damping slit 114 is formed in a hole shape to correspond to the center of the spiral portion of the wire antenna 130 , and eight second damping slits 116 are uniformly formed around the first damping slit 114 . They are formed radially at intervals and the same length.

For reference, in the present embodiment, a case in which one substrate 110 is cut on one disk 111 is described, but in the case of mass production, a plurality of substrates 110 are formed while the ultrasonic horn moves on one disk 111 . It is possible to simultaneously form a plurality of wire antennas by using a plurality of ultrasonic horns or the like.

In order to specify the position of the substrate 110, the circular plate 111 has a guide hole 118 that can estimate the size of the original plate 111 or a position guide hole that can specify the position of each substrate 110. It can be preformed.

Referring to FIG. 4 , a multi-wire antenna 130 , a short-range communication antenna 140 , and a magnetic security antenna 150 may be formed on the circular plate 111 . Although the order may be formed differently, since the multi-wire antenna 130 may be composed of five parallel wires 132 , the multi-wire antenna 130 is first formed on the disk 111 , and then the short-range communication antenna 140 and the magnetic security antenna 150 may be sequentially formed. Of course, they may be formed in another order.

In particular, the wire 152 for the 5-fold parallel wire 132 for the multi-wire antenna 130, the wire 142 for the short-range communication antenna 140, and the magnetic security antenna 150 are all exposed holes 112 passes through in a parallel straight line form, and is embedded in the disk 111 before and after the exposure hole 112 and may be provided in a fixed state.

Since the wires 132 , 142 , and 152 are fixed to the disk 111 at front and rear positions with respect to the exposure hole 112 , the wires form a stable bond to the disk 111 or the substrate 110 after embedding. can do.

The process of FIG. 4 can be implemented in general ultrasonic welding equipment, but when the inner diameter of the wire antenna 130 is formed to a narrower range or the number of parallel wires is 5, damping slits 114 and 116 are formed. That alone may not be enough.

As shown in Figure 5, the vacuum chuck base 200, which forms the suction force of the vacuum, can be used instead of the existing base. It may include a suction plate 220 mounted on the upper portion of the. A space for accommodating the suction plate 220 may be formed in the body 210 , and a flow path for forming a vacuum may be formed in a lower portion on which the suction plate 220 is mounted.

In this embodiment, the suction plate 220 may be formed using a porous material having an average pore size of about 5-40 μm, and as shown in FIG. 6 , the wires 132 and 142 fixed to the disk 111 of FIG. 3 . , 152) could be stably buried.

A connector 212 connected to the vacuum equipment may be formed on one side of the body 210 , and the disk 111 may be positioned at a predetermined position using the guide hole 118 of the disk 111 .

In the case of the suction plate 220, by using a suction plate having a porosity of 60% or less, it was possible to maintain a good quality of ultrasonic welding while forming a stable fixation. Because, when the porosity is increased, the quality of ultrasonic welding is deteriorated, and when the porosity is too small, good adsorption force is not formed, and the effect of the damping slit is reduced. In general, good quality was expected when the porosity was maintained at about 40-60%.

Referring to FIG. 7 , the original plate 111 may be cut along the outer boundary of the substrate 110 . In this process, the wires 132 , 142 , and 152 may be cut together with the boundary line of the substrate 110 to the outside of the exposure hole 112 , and the wires 132 , 142 , 152 are attached to the substrate 110 . It can be embedded and maintained in an aligned state. In addition, the multi-wire antenna 130 could also be manufactured without deformation by the first damping slit 114 and the second damping slit 116 formed in the center.

A connection circuit sheet 170 having terminals 120 corresponding to the multi-wire antenna 130 and the short-range communication antenna 140 formed thereon may be disposed on the upper right side, and the wires 132 passing through the exposure hole 112 . , 142 , 152 may be disposed under the exposed hole 112 to connect the terminals 120 .

8 is a view for explaining a connection between a wire and a terminal in an antenna sheet according to an embodiment of the present invention, and FIG. 9 is a view for explaining a cross section A-A' of FIG. 8 .

Referring to FIGS. 8 and 9 , a worker or a welding device electrically connects the wires 132 , 142 , 152 and the terminals 120 matched to each other through the exposure hole 112 , thereby forming a semi-finished product of the antenna sheet 100 . Alternatively, the finished product can be manufactured.

The terminals 120 may be provided in a line in the exposed hole 112 , and in order to secure a sufficient distance and size between the terminals 120 at the same length, the terminals 120 are disposed on the upper right side of the substrate 110 . may be disposed along the sloping edge of In the present embodiment, the exposure hole 112 is extended as one, but in some cases, a plurality of exposure holes 112 may be provided separately.

The welded antenna sheet 100 includes a substrate 110 having an exposed hole 112 formed therein, a multi-wire antenna 130 composed of parallel wires 132 embedded in the substrate 110 , and a multi-wire antenna 130 . The short-distance communication antenna 140 is formed in the periphery and is composed of a single wire 142 , the magnetic security antenna 150 is formed under the antenna sheet 100 and is also composed of another single wire 152 , and an exposed hole 112 . may include a connection circuit sheet 170 including wires 132 , 142 , 152 and electrically welded terminals 120 .

Specifically, in the region where the exposed hole 112 is formed, five parallel wires 132 pass through the upper portion of the exposed hole 112 and are welded with the terminals 120 located on the bottom surface, and a short-distance communication antenna ( The single wire 142 for 140 also passes through the upper part of the exposed hole 112 in parallel and is welded with the terminals 120, and the single wire 152 for the magnetic security antenna 150 to the right also passes through the exposed hole ( 112) is connected to the terminals.

The parallel wires 132 of the multi-wire antenna 130 buried outside the exposed hole 112 and the wires 142 and 152 of the other antennas 140 and 150 are also cut along with the boundary line of the substrate 110 . can be And, since the plurality of antennas must all be formed in the exposure hole, the wires 132 , 142 , 152 before and after the exposure hole 112 do not form a zigzag shape, but are parallel to cross perpendicular to the exposure hole 112 . can pass through

In this embodiment, the exposed hole 112 is formed in the substrate 110 , and the terminals 120 formed in the connection circuit sheet 170 are electrically connected to the wire passing through the exposed hole 112 , but in some cases The terminals may be formed directly on the board and the wires may pass directly through the terminals, and a method of connecting the wires exposed to the outside of the board and protruding out of the board to the terminals of the connection circuit sheet may also be applied.

As described above, although described with reference to preferred embodiments of the present invention, those skilled in the art can variously modify and change the present invention without departing from the spirit and scope of the present invention as set forth in the following claims. You will understand that it can be done.

1: mobile device 100: antenna sheet
110: board 120: terminals
130: multi-wire antenna 140: short-range communication antenna
150: magnetic security antenna 170: connection circuit sheet
132: parallel wire 142, 152: single wire

Claims (11)

In the method of manufacturing an antenna sheet including a wire antenna formed through wire embedding,
providing a substrate comprising at least one damping slit formed adjacent a location where the wire antenna is to be formed; and
embedding the wire so as to pass adjacently through the damping slit;
The damping slit is a method of manufacturing an antenna sheet, characterized in that formed to intersect a direction in which the wire antenna passes through the damping slit is buried. According to claim 1,
The method of manufacturing an antenna sheet, characterized in that the damping slit is formed adjacent to the center of the spiral portion of the wire antenna. According to claim 1,
The method of manufacturing an antenna sheet, characterized in that the damping slit is formed in the shape of a hole, a straight line, a curved line, or a combination thereof. According to claim 1,
A method of manufacturing an antenna sheet, characterized in that the wire is embedded in a state in which the substrate is temporarily fixed to a base providing an adsorption force. 5. The method of claim 4,
A method of manufacturing an antenna sheet, characterized in that the substrate is temporarily fixed by forming a negative pressure on the base. 6. The method of claim 5,
The base is a method of manufacturing an antenna sheet, characterized in that the suction plate is formed by using a porous material having an average pores of 5 to 40㎛. 6. The method of claim 5,
The method of manufacturing an antenna sheet, characterized in that the negative pressure is formed by the base using a suction plate having a porosity of 60% or less. In the antenna sheet for responding to changes in the surrounding electromagnetic field,
Board;
a wire antenna composed of a wire embedded in the substrate;
at least one damping slit formed adjacent to the wire antenna; and
The damping slit is an antenna sheet, characterized in that it is formed to cross the embedding direction of the wire antenna passing through the damping slit. 9. The method of claim 8,
The damping slit is an antenna sheet, characterized in that formed adjacent to the center of the spiral portion of the wire antenna. 9. The method of claim 8,
The damping slit is an antenna sheet, characterized in that formed in the shape of a hole, a straight line, a curved line, or a combination thereof. 9. The method of claim 8,
The wire antenna is an antenna sheet, characterized in that formed using a single wire or multiple parallel wires.

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