KR20140143119A

KR20140143119A - Nfc antenna and manufacturing method of the same

Info

Publication number: KR20140143119A
Application number: KR1020140068476A
Authority: KR
Inventors: 유종삼
Original assignee: 유종삼
Priority date: 2013-06-05
Filing date: 2014-06-05
Publication date: 2014-12-15
Also published as: WO2014196830A1; KR20140143113A; KR20140143111A; KR101499887B1; KR20140143112A

Abstract

The present invention relates to an NFC antenna for a mobile terminal capable of guaranteeing the stable performance of the antenna by sealing the edge of the antenna with an insulation film to prevent layer separation of a magnetic sheet (mainly ferrite sheets) which are commonly used in NFC antennas, and forming a plane by filling gaps between antenna patterns to increase adhesive force to a target, and to a manufacturing method capable of manufacturing the antenna through a simple automated process. According to the present invention, the NFC antenna includes: the magnetic sheet with one surface of which the antenna patterns are formed; the insulation film which is placed along the edge of the magnetic sheet with a thickness which is the sum of the thickness of the antenna patterns and the thickness of the magnetic sheet; a bifacial adhesive film which is placed on the other surface of the magnetic sheet or on the surface where the antenna patterns are formed; and a monofacial adhesive film which is placed on the surface where the antenna patterns are formed or on the other surface of the magnetic sheet.

Description

TECHNICAL FIELD [0001] The present invention relates to an NFC antenna and a method of manufacturing the same,

The present invention relates to an NFC antenna for a portable terminal and a method of manufacturing the same. More particularly, the present invention relates to an NFC antenna for a portable terminal, It is possible to manufacture an NFC antenna for a portable terminal that can secure a stable antenna performance by increasing a negative differential to an adherend by forming a flat plane by filling the gap formed between the pattern and the pattern, To a method of manufacturing the same.

NFC (Near Field Communication) is a non-contact type short-range wireless communication module that uses a frequency band of 13.56 MHz as one of radio frequency identification (RFID) tags. These NFCs are widely used not only for settlement but also for supermarkets and general shops, for transporting goods information, for travel to visitors, and for access control locks.

2. Description of the Related Art In recent years, portable terminals such as smart phones and tablet PCs having functions of information exchange, payment, ticket booking, and searching between terminals using short-range wireless communication have been expanded, have.

Particularly recently, studies on NFC antennas for portable terminals have been actively conducted,

As described in Korean Patent Laid-Open No. 10-2009-0126323 (name: NFC module, in particular, NFC module for mobile phone) and Korean Patent No. 10-1098263 (name: Enefsloop antenna) And is mounted on a battery pack, a battery cover, or the like.

1, a conventional NFC antenna module includes a magnetic sheet 100 (for example, a metal plate such as a ferrite sheet) stacked on a battery of a portable terminal, Shaped antenna pattern 500 and is mounted inside the battery pack 1 of the portable terminal.

A double-sided adhesive tape 300 for attaching the magnetic substance and the battery surface is arranged on the lower surface of the magnetic substance sheet 100 and a single-sided adhesive tape 200 for attaching the antenna pattern to the antenna pattern is arranged Became,

Thereafter, after removing the release paper of the double-sided tape, the NFC antenna is attached to the battery pack 1 and then used.

However, according to the conventional NFC antenna structure as described above, the edge portion of the magnetic material sheet is directly exposed to the outside, and the layer separation phenomenon may occur. Also, since the ferrite sheet currently used as the magnetic material sheet is exposed to the outside of the edge portion There is a problem in that particles (flour) may fall off and adversely affect the appearance and other peripheral parts, which may be an impediment to antenna performance and terminal performance.

In addition, when the NFC antenna is mounted on the battery cover, the NFC antenna is exposed inside the battery cover to allow the user to open and close the battery cover for battery replacement, and the NFC antenna can be touched by the user. There is a problem that the antenna may be detached or the NFC antenna may be damaged.

Furthermore, there is a problem that a space (S) is formed between the loop antenna pattern and the pattern, and thus, the attachment surface is bent when the antenna is attached to a battery or the like, which adversely affects the adhesive force and ultimately impedes the antenna performance It's a problem.

In recent years, in order to provide user convenience, a technique of charging a battery of a portable terminal with a wireless battery without using a separate charging adapter has been applied. To this end, a wireless charging antenna is installed in a battery cover or a battery pack of a portable terminal. Depending on the design structure, the NFC antenna may also function as a wireless charging antenna.

Accordingly, the NFC antenna for a portable terminal according to the present invention has a problem in that the edge of the magnetic sheet is exposed to the outside to cause layer separation, but also the problem that the particles are separated due to the same reason, and that when the NFC antenna is mounted on the battery cover, An NFC antenna for a portable terminal in which an edge of a magnetic sheet is sealed by inserting an insulating film around an outer surface of a magnetic sheet is provided so as to solve the problem that the NFC antenna is damaged by increasing the reliability of the antenna. There is a purpose.

Another object of the present invention is to provide an NFC antenna for a portable terminal which is filled with an insulating film to form a flat surface.

It is another object of the present invention to provide a method of manufacturing an NFC antenna for a portable terminal by introducing a simple automation process in providing the NFC antenna for a portable terminal having the above-described configuration.

According to an aspect of the present invention, there is provided an NFC antenna for a portable terminal,

A magnetic sheet on which an antenna pattern is formed on one surface of the magnetic sheet; an insulating film arranged along the outer surface of the magnetic sheet with a thickness of the antenna pattern and the thickness of the magnetic sheet; And a single-sided adhesive film arranged on the other side of the surface of the magnetic substance sheet on which the antenna pattern is formed or the magnetic substance sheet.

And further includes a filler film inserted between the antenna pattern and the pattern.

Next, a method of manufacturing an NFC antenna for a portable terminal according to the present invention includes:

A first laminating step of laminating a filler film to an adhesive base film on one side,

A first cutting step of cutting the inside of the filling film joined to the base film into an antenna pattern,

A first scrap removing step of removing a filler film scrap located at a position where the antenna pattern is to be formed with reference to a cutting line formed on the filler film;

A second laminating step of laminating an antenna pattern forming film for forming an antenna pattern on a top surface of the laminated film from which the filled film scrap is removed,

A second cutting step of cutting the antenna pattern forming film that has undergone the second joining step into an antenna pattern;

A second scrap removing step of removing an antenna pattern forming scrap that is not located at a position where the antenna pattern is to be formed with reference to the film-formed cutting line for forming the antenna pattern;

A third laminating step of laminating the insulating film on the upper surface of the laminated film having undergone the second scrap removing step,

A third cutting step of cutting the inside of the insulating film along the outer surface of the NFC antenna,

A third scrap removing step of removing an inner insulating film scrap while leaving an outer edge based on a cutting line formed on the insulating film after the third cutting step;

And a fourth joining step of arranging the magnetic sheet at the scraped position removed in the third scraping step.

According to the NFC antenna for a portable terminal having the above-described configuration, the edge of the magnetic sheet is sealed to separate the magnetic sheet, or the particles are separated for the same reason. When the NFC antenna is mounted on the battery cover The reliability of the adhesive force between the battery cover and the NFC antenna is improved, thereby solving the problem of the NFC antenna being damaged.

Furthermore, since the space created by the separation of the antenna pattern and the pattern is filled with a separate insulating film, it is possible to form a flat plane compared to the conventional NFC antenna, thereby stably maintaining the adhesion to the adherend (battery pack or battery case of the portable terminal) There,

This leads to the effect that ultimately excellent antenna performance can be obtained.

In addition, in manufacturing an NFC antenna for a portable terminal as described above, it is expected that an accurate antenna can be formed while performing an automated and simple process.

1 shows a conventional NFC antenna structure.
2 is a view showing an NFC antenna structure according to the present invention attached to a battery pack.
3 is a view showing an NFC antenna structure according to the present invention attached to a portable terminal battery cover.
FIG. 4 is an exploded perspective view of the NFC antenna structure of FIG. 2; FIG.
5 is a view showing another embodiment of an NFC antenna according to the present invention.
6 is an exploded perspective view of the NFC antenna structure according to FIG.
7 is a view schematically illustrating a process for manufacturing an NFC antenna according to FIG.

Hereinafter, an NFC antenna for a portable terminal according to the present invention and its manufacturing method will be described in detail with reference to the drawings.

Firstly, the magnetic sheet 100 used in the NFC antenna of the present invention includes both a soft magnetic material absorber and a ferromagnetic material sheet,

Hereinafter, a ferrite sheet having high permeability commonly used for an NFC antenna will be described. However, the scope of the present invention is not limited thereto, and various magnetic sheets already disclosed in the existing NFC antenna patents may be used.

2 and 3, the NFC antenna for a portable terminal according to the present invention includes:

A ferrite sheet 100, an antenna pattern 500 formed on one surface of the ferrite sheet, and an insulating film 400 surrounding the ferrite sheet and the antenna pattern to seal the ground. .

The stacking position of the double-sided adhesive film 300 and the single-sided adhesive film 200 differ depending on whether the NFC antenna for a portable terminal is attached to the battery or the battery cover of the portable terminal,

2, the double-sided adhesive film 300 is arranged on the lower surface of the ferrite sheet 100 and then adhered to the battery pack 1 through the double-sided adhesive film 300. In this case, And the end face adhesive film 200 is attached to the side where the antenna pattern 500 is formed to prevent the antenna pattern from being exposed to the outside.

3, the double-sided adhesive film 300 is adhered to the antenna pattern 500, and then the double-sided adhesive film 300 is attached to the portable terminal battery cover 2 through the double- And a single-sided adhesive film 200 is attached to the surface on which the ferrite sheet 100 is placed to protect the ferrite sheet from the outside.

Hereinafter, the battery pack mounting type will be described with reference to FIG.

Referring again to FIG. 2, the NFC antenna for a portable terminal according to the present invention includes:

A ferrite sheet 100, an antenna pattern 500 formed on one surface of the ferrite sheet, an insulating film 400 located outside the ferrite sheet and the antenna pattern and sealing the ground,

And a double-sided adhesive film (300) attached to a surface on which the ferrite sheet is exposed and then attached to the battery to mount the NFC antenna on the battery pack.

Of course, the release film is attached to the exposed surface of the double-sided adhesive film 300, and the bridge (i.e., the terminal portion) 600 before the single-sided adhesive film is attached is formed.

A PET film may be considered as the insulating film 400 which is located outside the ferrite sheet and the antenna pattern and seals the paper.

Next, as shown in FIG. 4, the insulating film 400 is formed along the edge of the ferrite sheet 100 and is formed into a sheet-like sheet. The thickness of the insulating film 400 should be a sum of the thickness of the ferrite sheet 100 and the thickness of the antenna pattern 500 since sealing must be performed to the ground of the surface on which the antenna pattern is formed.

As a result, according to the present invention, the NFC antenna is completed only by joining the two-sided adhesive film and the one-sided adhesive film arranged above and below the ferrite sheet having the antenna pattern formed on one surface thereof, The ferrite sheet 100 on which the ferrite sheet 500 is formed and the ferrite sheet as the edge and the insulating film 400 are arranged by the thickness of the antenna pattern, And the bonding of the double-sided adhesive film 300 with the ferrite sheet 100 and the insulating film 400 is completed, so that the NFC antenna is completed,

The problem of existing NFC antennas is that when the NFC antenna is not stitched, the ferrite sheet is separated from the edge of the antenna and the ferrite sheet is separated or corroded, which ultimately deteriorates the antenna performance .

5 and 6, a NFC antenna for a portable terminal according to the present invention includes a filler film (see FIG. 1 to FIG. 3) formed between the antenna pattern and the pattern 700 may be additionally inserted,

As a result, the NFC antenna can be formed in a flat plane shape, and when the antenna is attached to a surface (battery pack or portable terminal battery cover) of the antenna, Can not be maintained.

The above-mentioned filling film 700 is preferably an insulating film.

Hereinafter, a method of manufacturing an NFC antenna for a portable terminal will be described. However, the term " laminated film " as used in the description of the production method does not mean a laminated film having a specific structure, but it is used as a generic term for a film in which two or more films are laminated.

FIG. 7 schematically shows a method of manufacturing an NFC antenna in which a cushion film 700 is formed between an antenna pattern and a pattern.

7,

The first roller is provided with a base film, and the upper surface thereof is provided with a filler film 700 (provided that the filler film in this step is in the form of a plate which can be inserted between the antenna pattern and the pattern) 1 cutting machine C1,

In the first cutting device C1, cutting of the filling film 700 proceeds according to the antenna pattern of the NFC antenna to be finally manufactured.

When the first cutting machine has passed the first cutting machine, the first rollers Ra1 disposed after the first cutting machine cuts the scrap (700) placed in the place where the antenna pattern is to be formed in the cut film (700) 700a are removed,

(Base film-filled film) from which the scrap 700a has been removed from the filler film 700 through the second roller R2 positioned next to the first roller for scrap removal, Copper film) 500A are arranged.

The laminated film arranged as described above is cut to the antenna pattern forming film 500A in the same pattern as that in the first cutting machine C1 while passing through the second cutting machine C2.

Then, when passing through the second cutting machine, the antenna pattern forming film 500A cut by the second roller Ra2 for scrap removal located next to the second cutting machine forms an antenna pattern The scrap 500a is removed,

An antenna pattern 500 is formed on the upper surface of the base film B and a filler film 700 is inserted between the antenna pattern and the pattern. That is, the filling film 700 and the antenna pattern forming film have the same thickness.

Next, the antenna pattern 500 is formed on the upper surface of the base film B through the third roller R3, and the insulating film 400 is formed on the upper surface of the laminated film in which the filling film 700 is inserted between the pattern and the pattern. Are arranged,

The insulating film 400 is cut with a paper of the NFC antenna while passing through the third cutting machine. (For reference, the insulating film has a thickness value of the thickness of the ferrite sheet and the antenna pattern, as described above.).

Then, the insulating film scrap 400a located inside the NFC antenna paper is removed through the third roller Ra3 for scrap removal located after the third cutting machine.

Thereafter, the ferrite sheet 100 is fed to the fourth roller R4 positioned next to the third roller for scrap removal, and the ferrite sheet 100 is placed on the upper surface of the laminate film.

The filling film 700 is inserted between the antenna pattern 500 and the pattern 500 on the upper surface of the base film B and the insulating film 400 is positioned on the outer side of the ferrite sheet, The shape of the pattern is sealed.

Although the double-sided adhesive film 300 is arranged on the upper surface of the ferrite sheet 100 (though not shown in the figure), if the NFC antenna is attached to the battery cover of the portable terminal, the single-sided adhesive film is arranged in this process)

After the base film B located below is removed, a single-sided adhesive film 200 is attached to the removed place with the antenna pattern and the surface where the filler film is inserted between the pattern and the pattern (if the NFC antenna is attached to the battery Sided adhesive film is arranged in this process if it is in the form of being attached to a cover)

An NFC antenna for a portable terminal is completed.

However, in some cases, the step of attaching the adhesive film may be omitted by replacing the base film with a single-sided adhesive film or a double-sided adhesive film.

Of course, a step of forming the bridge 600 before attaching the single-sided adhesive film 200 should be added.

For reference, in the above-mentioned processes, the scrap is removed through the scraping removal rolls Ra1, Ra2, Ra3. In this method, the scrap removing tape having a stronger adhesion force than the adhesive force between the laminated films is removed So that the scrap can be removed, and the scrap removal method is not limited to the above-mentioned method.

While the present invention has been described with reference to the accompanying drawings, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.

Description of the Related Art [0002]
100: magnetic sheet (ferrite sheet) 200: single-sided adhesive film
300: double-sided adhesive film 400: insulating film
500: antenna pattern 600: terminal portion
700: filled film
B: base film
C1, C2, C3: 1st, 2nd, 3rd cutter
400a: insulating film scrap
500A: Film for forming antenna pattern 500a: Scrap for forming antenna pattern
700a: Filled Film Scrap

Claims

A magnetic sheet having an antenna pattern formed on one surface thereof:
An insulating film arranged along the outer periphery of the magnetic sheet with a thickness of the antenna pattern thickness and the thickness of the magnetic body sheet;
A double-sided adhesive film arranged on the other surface of the magnetic substance sheet or the surface on which the antenna pattern is formed; And
And a single-sided adhesive film arranged on one side of the magnetic substance sheet, on which the antenna pattern is formed or on the other side of the magnetic substance sheet.

The method according to claim 1,
And a filler film inserted between the antenna pattern and the pattern.

3. The method of claim 2,
Wherein the filling film is made of an insulating material.

A first joining step of joining a filler film to an adhesive base film on one surface thereof;
A first cutting step of cutting the inside of the filling film joined to the base film into an antenna pattern;
A first scrap removing step of removing a filler film scrap located at a position where the antenna pattern is formed with reference to a cutting line formed on the filler film;
A second lamination step of laminating an antenna pattern forming film for forming an antenna pattern on the upper surface of the laminated film from which the filled film scrap is removed;
A second cutting step of cutting the antenna pattern forming film that has undergone the second joining step into an antenna pattern;
A second scrap removing step of removing an antenna pattern forming scrap that is not located at a position where the antenna pattern is formed with reference to the film-formed cutting line for forming the antenna pattern;
A third jointing step of joining the insulating film to the upper surface of the joint film through the second scraping step;
A third cutting step of cutting the inside of the insulating film along the outer surface of the NFC antenna;
After the third cutting step, the outer edge is left with reference to the cutting line formed on the insulating film,
A third scrap removing step of removing the insulating film scrap; And
And a fourth jointing step of arranging a magnetic sheet at a scraping position removed in the third scrape removing step.

5. The method of claim 4,
Wherein the base film is removed after attaching a double-sided adhesive tape or a single-sided adhesive tape to one surface after the fourth laminating step, and then removing the base film.