KR20100080109A - Method for fabricating loop antenna - Google Patents

Abstract

The present invention relates to a loop antenna, and more particularly to a loop antenna forming method capable of reducing the size and thickness of a communication terminal. Such a loop antenna forming method of the present invention comprises the steps of preparing a battery cover made of a non-conductive material; An antenna pattern layer formed in a loop shape from a central portion of one side of the battery cover to an outer portion, an antenna first contact pattern layer formed to be connected to an outer end of an outer portion of the antenna pattern layer, and the antenna Printing an antenna second contact pattern layer formed separately from the antenna pattern layer on an outer portion of the pattern layer; Plating the antenna pattern layer, the first contact pattern layer and the second contact pattern layer; Coating a first coating layer by using an insulating material on an entire surface of the antenna pattern layer except for a bridge contact end portion of a center portion of a battery cover among the antenna first contact pattern layer, antenna second contact pattern layer, and antenna pattern layer; Printing a bridge pattern layer connecting the antenna second contact pattern layer and a bridge contact end portion of a center portion of a battery cover of the antenna pattern layer; Plating the bridge pattern layer; Coating a second coating layer using an insulating material on an entire surface of the antenna pattern layer including the bridge pattern layer except for the antenna first contact pattern layer and the antenna second contact pattern layer; Forming a pad layer on each of the antenna first contact pattern layer and the antenna second contact pattern layer; It is made, including.

Therefore, according to the loop antenna of the present invention, the loop antenna is formed on the battery cover of the mobile communication terminal, thereby reducing the size and thickness of the communication terminal.

Description

Method for fabricating loop antenna

The present invention relates to a loop antenna, and more particularly to a loop antenna forming method capable of reducing the size and thickness of a communication terminal.

In general, a portable wireless communication terminal such as a mobile phone and a mobile phone is provided with an antenna for transmitting and receiving a wireless signal.

Such an antenna is classified into an external type and an internal type according to a mounting method, and an internal antenna is called an inner antenna.

An antenna that is designed to be mounted inside the terminal to maintain antenna characteristics without any protrusions on the outside. Although it is being developed in various ways for the purpose of miniaturization and design of the terminal and improvement of the electromagnetic absorption rate (SAR), it has not reached the level that can replace the existing protruding antenna.

At present, it has a narrow bandwidth, low gain but easy to manufacture, and has a planar Planar Inverted-F Antenna (PIFA) with excellent SAR characteristics, as well as PCB-type metal film PCB, ceramic chip antenna, low-temperature co-fired ceramic (LTCC) antenna In addition, various built-in antennas of three-dimensional form have been put to practical use.

In the past, antennas of mobile communication terminals such as mobile phones have been predominantly made of external protrusions such as helical antennas and whip antennas, but recently, in order to improve the miniaturization and design of the terminal body, and to improve the SAR (SAR) Planar Inverted-F Antenna (PIFA) with built-in flat panel structure mounted on the board, metal printed circuit board in PCB form, ceramic chip antenna, low-temperature co-fired ceramic (LTCC) antenna, and various built-in antennas in three-dimensional form Has been put into practical use.

As a form of such a built-in antenna, the Republic of Korea Patent Publication No. 10-0605421, 10-0735701, etc. is proposed to implement the antenna by forming a metal thin film pattern on a substrate of a non-conductive material.

In forming a metal thin film pattern on a substrate of such a non-conductive material, conventionally, a pattern is formed by a method of applying and drying a metal paste, followed by etching, and thus a thin copper plate is attached with an adhesive or manufactured by an insert mold method. In addition, the manufacturing process was complicated and a lot of defects occurred, there was a problem in that there is a limit in thinning.

On the contrary, Korean Patent Laid-Open Publication No. 10-2006-0040464 discloses a method of digging grooves of a predetermined depth along an antenna pattern on a substrate, which is a non-conductive material, and applying a metal paste to the entire surface of the substrate including the grooves and drying the metal paste. A method of forming an antenna pattern in which metal is embedded along the groove is proposed, but this method requires a mechanical processing process, which is difficult to mass-produce, and the dried metal face component is removed from the substrate groove during the processing process. There were still problems such as this occurring a lot.

Meanwhile, Korean Patent Publication No. 10-0573309 describes cutting a nonconductive synthetic resin film such as plastic, polycarbonate, and polyethylene resin along a desired antenna pattern, and manufacturing the antenna by plating it with metal and attaching it to an external case of a terminal. A solution is proposed. As such, in order to plate the surface of a non-conductive material such as a plastic product, a pretreatment process for imparting conductivity to a portion to be plated must be preceded. Pretreatment to impart conductivity generally includes etching and activation processes. Etching is the process of roughly scraping off the part to be plated to form holes for physically trapping precious metal particles such as palladium, and the activation step is for example colloid containing tin and palladium. After the product is immersed in the solution for a certain time, sulfuric acid treatment is used to capture the palladium metal particles in the holes formed by the etching. The palladium metal particles captured as described above provide conductivity to the surface of the product, and the surface of the product to which conductivity is provided can be plated by electroplating or electroless plating like the metal.

Conventionally, for example, ABS-based resin paints have been proposed as a pretreatment for plating to coat metal films on thermoplastic resins or thermosetting resins, but only some plastic products such as ABS resins have been proposed. It is effective, but the plating is not practical for other plastic products, such as polycarbonate, such that the catalytic metal capture ability is not improved and adhesion is weak due to easy peeling. Here, the adhesion can be improved by lengthening the above-described etching time to deepen the hole for physical capture of the catalytic metal, but there is a limit to the improvement, but rather, the surface of the product is excessively modified so that the original performance is improved. There was a problem such as deterioration.

The present invention has been made to solve the above problems of the prior art, and an object of the present invention is to provide a loop antenna forming method capable of compacting the size and thickness of a communication terminal.

Loop loop forming method of the present invention for achieving the above object comprises the steps of preparing a battery cover made of a non-conductive material; An antenna pattern layer formed in a loop shape from a central portion of one side of the battery cover to an outer portion, an antenna first contact pattern layer formed to be connected to an outer end of an outer portion of the antenna pattern layer, and the antenna Printing an antenna second contact pattern layer formed separately from the antenna pattern layer on an outer portion of the pattern layer; Plating the antenna pattern layer, the first contact pattern layer and the second contact pattern layer; Coating a first coating layer by using an insulating material on an entire surface of the antenna pattern layer except for a bridge contact end portion of a center portion of a battery cover among the antenna first contact pattern layer, the antenna second contact pattern layer, and the antenna pattern layer; Printing a bridge pattern layer connecting the antenna second contact pattern layer and a bridge contact end portion of a center portion of a battery cover of the antenna pattern layer; Plating the bridge pattern layer; Coating a second coating layer using an insulating material on an entire surface of the antenna pattern layer including the bridge pattern layer except for the antenna first contact pattern layer and the antenna second contact pattern layer; Forming a pad layer on each of the antenna first contact pattern layer and the antenna second contact pattern layer; It is made, including.

In addition, the loop antenna forming method of the present invention for achieving the above object, spaced apart at a predetermined interval on one side of the battery cover made of a non-conductive material to form an antenna first contact pattern layer and an antenna second contact pattern layer. At the same time, one end is extended from the antenna first contact pattern layer and formed in a loop shape. The first end pattern layer surrounds the first contact pattern layer and is formed from an inner part to an outer part of the battery cover, and the other end is an antenna second contact. Forming an antenna pattern layer connected to the pattern layer; Coating a coating layer on a battery cover including the antenna first contact pattern layer and a front surface of the antenna pattern layer except for the antenna second contact pattern layer; Forming a first pad layer on the antenna first contact pattern layer, and forming a second pad layer on the antenna second contact pattern layer; It is made, including.

Here, it is preferable to add copper plating on the antenna pattern layer, the antenna first contact pattern layer, the antenna second contact pattern layer, and the bridge pattern layer.

The pad layer is preferably formed by black nickel plating or black nickel plating and gold plating.

The forming of the antenna pattern layer, the antenna first contact pattern layer, and the antenna second contact pattern layer may include forming the antenna pattern layer, the antenna first contact pattern layer, and the antenna second contact pattern layer on the battery cover. After defining the area to be formed, the pretreatment ink for imparting conductivity along the above defined area is a resin mainly composed of one of polycarbonate, polystyrene, and acrylic rubber, and cyclohexanone, butyl carbitle and toluene are used as solvents. Forming a printed layer printed with agitated ink; forming a first metal layer formed of chemical plating on the printed layer; and plating metal formed of a second metal layer formed of electroplating on the first metal layer. It is preferable to include the step of forming a thin film.

In addition, the ink is mixed in a ratio of 500 to 600 g of cyclohexanone, 500 to 600 g of butyl carbiter, and 200 to 400 g of toluene with respect to 1,000 g of a resin having a main component of the polycarbonate, polystyrene, and acrylic rubber as described above. Conductive carbon 100g to 200g, in which the cyclohexanone 500 to 600 g, the butyl carbiter 500 to 600 g, and the toluene 200 to 400 g are mixed with respect to 1,000 g of the resin having one of the polycarbonate, polystyrene, and acrylic rubber as a main component. Or 100 g to 200 g of conductive carbon in 500 to 600 g of cyclohexanone, 500 to 600 g of butyl carbiter, and 200 to 400 g of toluene, with respect to 1,000 g of resin added as the main component of polycarbonate, polystyrene, and acrylic rubber. It is preferable that 50g-100g of binders for adhesion promotion are further added to the added thing.

On the other hand, the loop antenna forming method of the present invention for achieving the above object, the step of defining a predetermined area of the battery cover made of a non-conductive material as a bridge pattern layer forming region and then printing a bridge pattern layer; Coating using a first coating layer to expose one end of the bridge pattern layer and the other end of the bridge pattern layer; An antenna first contact pattern layer is printed on one end of the outer edge of the battery cover among the ends of the bridge pattern layer, and at the same time, an antenna second contact pattern layer is spaced apart from the antenna first contact pattern layer by a predetermined distance. An inner end of the bridge pattern layer is connected to the other end of the bridge pattern layer inside the battery cover, and the other end is formed in a loop shape crossing the first coating layer, and the end thereof is connected to the antenna second contact pattern layer. Forming an antenna pattern layer; Coating a second coating layer using an insulating material on the antenna pattern layer and the bridge pattern layer except for the antenna first contact pattern layer and the antenna second contact pattern layer; Forming a first pad layer on the antenna first contact pattern layer, and forming a second pad layer on the antenna second contact pattern layer; It is made, including.

According to the loop antenna forming method of the present invention as described above has the following effects.

Firstly, the thickness of the communication terminal can be reduced overall, thereby making the communication terminal overall compact.

Second, since the antenna pattern is formed on the battery cover, the coating process is easy to protect the antenna pattern, and there is no discomfort in general eyes.

Hereinafter, a method of forming a loop antenna according to the present invention will be described in detail with reference to the accompanying drawings.

In addition, the terminology used in the present invention is a general term that is currently widely used as possible, but in certain cases, the term is arbitrarily selected by the applicant, and in this case, the meaning is described in detail in the description of the present invention, and a simple term is used. It is to be understood that the present invention is to be understood as a meaning of terms rather than names.

In addition, in describing the embodiments, descriptions of technical contents that are well known in the technical field to which the present invention belongs and are not directly related to the present invention will be omitted. This is to more clearly communicate without obscure the subject matter of the present invention by omitting unnecessary description.

1 to 1F are views for explaining a loop antenna formation method according to a first embodiment of the present invention, and FIGS. 2A to 2F are diagrams for a printing layer forming method in a loop antenna formation method according to a first embodiment of the present invention. It is a figure for demonstrating.

In the loop antenna forming method according to the first embodiment of the present invention, as shown in FIG. 1A, a battery cover 10 made of a nonconductive material is prepared. The battery cover 10 may be formed of a plastic such as polycarbonate.

Subsequently, as shown in FIG. 1B, a loop-shaped antenna pattern layer 20, an antenna first contact pattern layer 21, and an antenna second contact pattern layer 22 are printed on one side of the battery cover 10. . Here, the antenna pattern layer 20 is formed in a loop shape from the center portion to the outer portion of the battery cover 10, the antenna first contact pattern layer 21 is the antenna pattern of the outer portion of the antenna pattern layer 20 The antenna second contact pattern layer 22 is formed to be separated from the antenna pattern layer 20 at an outer portion of the antenna pattern layer 20. In this case, the antenna second contact pattern layer 22 is formed outside the antenna pattern layer 20, and is perpendicular to the bridge contact end portion 23 inside the antenna pattern layer 20 (or horizontally depending on the viewing direction). It is preferable to form at. In addition, copper plating may be performed on the antenna pattern layer 20, the antenna first contact pattern layer 21, and the antenna second contact pattern layer 22.

The antenna pattern layer 20, the antenna first contact pattern layer 21, and the antenna second contact pattern layer 22 are composed of a printed layer, a first metal layer and a second metal layer. This will be described with reference to FIGS. 2A to 2F.

First, the printing layer 2 is printed by using a plating pretreatment ink on the battery cover 10 by, for example, a stamping method. At this time, the pretreatment ink stock solution for plating is 500 g to 600 g of cyclohexanone, 400 g to 500 g of toluene, 200 g of toluene as a solvent with respect to 1,000 g of a mixed resin containing any one of non-halogen flame retardant resins, polystyrene, and acrylic rubber as main components. Using ˜400 g, it can be formulated by stirring with a stirrer for 2 to 3 hours while heating and holding at 180 ° C. to 200 ° C.

Conductive carbon 100g ~ 200g may be preferably added to the ink stock solution. The conductive carbon enables the printing of fine patterns by preventing the static electricity by activating the conductivity of the printing layer, and ensuring sufficient etching time by improving the thickness and hardness of the printing layer on the product surface.

The ink stock solution may also be preferably added to the binder 50 to 100g to increase the adhesive strength to the surface of the product to be plated.

Hereinafter, the Example regarding an ink composition is described.

(Example 1)

1,000 g of polycarbonate, a non-halogen flame retardant resin, was used as a main raw material, and 500 g of cyclohexanone, 400 g of butyl carbitle, and 200 g of toluene were used as a solvent, followed by stirring for 2 to 3 hours while heating to 180 ° C to 200 ° C in a beaker. Stock solution composition. This ink could be used as a spray on the surface of the product to be plated, and it may be used as a more suitable ink for stamping printing when 50 g of an adhesive promoting binder is added to improve the adhesiveness for printing a minute portion.

Experimental Example

First, the battery cover 10 is immersed in a liquid composition of 30 ~ 40g / l to remove the oil and then washed with water, and the desired pattern is printed by stamping the ink stock solution according to Example 1, then 500g / chromic anhydride l, immersed in 200g / l sulfuric acid, 30g / l aqueous solution of chromium, etched, immersed in palladium-tin colloidal solution, activated and sulfated, and subjected to primary copper plating with known chemical plating, followed by electroplating. Primary nickel plating is performed.

2A to 2F, reference numeral 1 may be formed of polycarbonate as a battery cover, 2 is a printed layer printed by stamping on the surface of the substrate 1, 3 is a hole formed in the etching step of the printed layer, 4 is Palladium-tin compound trapped in the hole 3 of the printing layer 2 in the activation step, 5 is palladium metal particles having tin film removed in the sulfuric acid treatment step after activation, 6 is a copper plating layer as a first metal layer formed by chemical plating And 7 are nickel plated layers as second metal layers formed by electroplating.

As a result of the above experimental example, the thickness of the printed layer 2 was 0.4 to 0.5 µm, and the printed layer 2 was partially peeled off within 1 to 2 minutes of etching time by chromium and sulfuric acid solution, and then the plating pattern was weakened. After X-cutting at 5mm intervals, the test was performed after the office transparent adhesive tape (aka Scotch tape) was bonded and peeled off. As a result, each X-cutting plated layer was lifted from the surface of the product. That is, it could be plated without difficulty, but it was found that the adhesive strength with the product was slightly decreased.

(Example 2)

In the ink stock solution of Example 1 described above, 100 g of carbon was added, and the rest was performed in the same manner to form an ink and plating was performed as in the above experimental example. As a result, the thickness of the printed layer 2 was increased from 0.5 μm to 0.6 μm, and the etching time 3 to 4 minutes was secured to form the holes 3 large and deep. In addition, no lifting phenomenon of the X-cutting plating layer was found in the test under the same conditions.

(Example 3)

1,000 g of polystyrene was used as a main raw material, 500 g of cyclohexanone, 500 g of butyl carbitle, and 300 g of toluene were used as solvents, and 120 g of conductive carbon and 60 g of a binder for promoting adhesion were added to form a stamping ink stock solution. Plating was performed.

(Example 4)

1,000 g of acrylic rubber is used as the main raw material, 600 g of cyclohexanone, 400 g of butyl carbitle, and 300 g of toluene are used as solvents, and 120 g of conductive carbon and 60 g of a binder for promoting adhesion are added to form a stamping ink stock solution. Plating was performed as well.

Experimental results of Examples 3 and 4 resulted in almost the same results as the experimental results of Example 2.

The above embodiment shows a preferred embodiment of the case of using a polycarbonate as a battery cover, but can be applied to all plastic materials including polycarbonate, and also to a glass or glass fiber material.

Next, as shown in FIG. 1C, the antenna pattern layer 20 and the antenna first contact pattern on the antenna pattern layer 20, the antenna first contact pattern layer 21, and the antenna second contact pattern layer 22. The first coating layer 30 may be coated to cover the layer 21 and the antenna second contact pattern layer 22. Here, the first battery cover 10 includes the antenna first contact pattern layer 21, the antenna second contact pattern layer 22, and the front surface of the antenna pattern layer 20 except for the bridge contact end 23. Coating the coating layer 30. In other words, the antenna first contact pattern layer 21 is opened by the second contact open area 32, the antenna second contact pattern layer 22 is opened by the first contact open area 31, and the bridge The contact end 23 is also opened without being coated by the inner end contact open region 33, and the remaining antenna loop pattern layer 20 is coated by the first coating layer 30.

Here, the first coating layer 30 preferably uses an insulating material. Polycarbonate may be used as the first coating layer 30.

Next, as shown in FIG. 1D, a bridge pattern layer 24 connecting the antenna second contact pattern layer 22 of the first contact open region 31 and the inner end contact open region 33 is formed. . At this time, the bridge pattern layer 24 is preferably printed using a partial printing method for forming the bridge pattern, copper plating may be added.

Subsequently, as illustrated in FIG. 1E, the second coating layer 40 is formed by using an insulating material on the battery cover 10 except for the first contact open region 31 and the second contact open region 32. In this case, the same material as the first coating layer 40 may be used. In other words, it may be formed of polycarbonate.

1F, a first pad layer 51 is formed in the first contact open region 31, and a second pad layer 52 is formed in the second contact open region 32. At this time, the first pad layer 51 and the second pad layer 52 may be subjected to a plating process using black nickel plating, or after the black nickel plating, gold plating is added again, so that the antenna first contact pattern layer 21 may be The first pad layer 51 may be connected, and the antenna second contact pattern layer 22 may be connected to the second pad layer 52. Also in this case, in forming the first pad layer 51 and the second pad layer 52, it is preferable to use the partial plating method.

3A to 3F are diagrams for explaining a loop antenna forming method according to a second embodiment of the present invention.

In the loop antenna forming method according to the second embodiment of the present invention, the bridge pattern layer is first formed in the loop antenna forming method according to the first embodiment of the present invention shown in FIGS. 1A to 1F. There is a difference.

That is, as shown in Figure 3a, a battery cover 100 made of a non-conductive material is prepared. The battery cover 100 may be formed of a plastic such as polycarbonate.

Subsequently, as illustrated in FIG. 3B, a predetermined region of the battery cover 100 is defined as a bridge pattern layer forming region, and then the bridge pattern layer 110 is printed. The bridge pattern layer 110 can be formed using the same method as the printing method in the first embodiment of the present invention.

Next, as shown in FIG. 3C, the bridge pattern layer 110 is coated using the first coating layer 120 to expose one end of the bridge pattern layer 110 and the other end of the bridge pattern layer 110.

As shown in FIG. 3D, the loop-shaped antenna pattern layer 130, the antenna first contact pattern layer 131, and the antenna second contact pattern layer intersect the first coating layer 120 on the battery cover 100. Print 132. Here, the antenna pattern layer 130 is basically formed in a loop shape from the center portion to the outer portion of the battery cover 100, the bridge pattern layer 110 inside the battery cover 100 of the bridge pattern layer 110 Another end of the inner end and the inner end is connected, the outer end is connected to the first contact pattern layer 131.

Subsequently, as shown in FIG. 3E, the second coating layer 140 is disposed on the battery cover 100 including the antenna first contact pattern layer 131 and the entire antenna pattern layer 130 except for the antenna second contact pattern layer 132. )). In other words, the antenna first contact pattern layer 131 is opened by the second contact opening region 142, and the antenna second contact pattern layer 132 is opened by the first contact opening region 141.

As shown in FIG. 3F, the first pad layer 151 is formed in the first contact open region 141, and the second pad layer 152 is formed in the second contact open region 142. At this time, the first pad layer 151 and the second pad layer 152 are subjected to a plating process using black nickel plating, or gold plating is added again after the black nickel plating, so that the antenna first contact pattern layer 131 is The antenna may be connected to the first pad layer 151 and the antenna second contact pattern layer 132 may be connected to the second pad layer 152.

4A to 4D are diagrams for describing a loop antenna forming method according to a third embodiment of the present invention.

In the loop antenna forming method according to the third embodiment of the present invention, a process of forming a bridge pattern layer is omitted as compared to the loop antenna forming method according to the first or second embodiment of the present invention, thereby simplifying the loop antenna forming process. As shown in FIG. 4A, a battery cover 200 made of a non-conductive material is prepared.

Subsequently, as shown in FIG. 4B, a loop-shaped antenna pattern layer 200, an antenna first contact pattern layer 211, and an antenna second contact pattern layer 212 are printed on one side of the battery cover 200. do. Here, the antenna first contact pattern layer 211 and the antenna second contact pattern layer 212 are formed spaced apart at a predetermined interval, at this time, one end of the antenna pattern layer 200 is the antenna first contact pattern layer ( It extends from 211 to form a loop shape, which surrounds the first contact pattern layer 211 and is formed from the inner part of the battery cover to the outer part, and the other end is connected to the antenna second contact pattern layer 212. . Here, the method of printing the antenna pattern layer 200, the antenna first contact pattern layer 211 and the antenna second contact pattern layer 212 may use the same method as in the first embodiment of the present invention.

Subsequently, as illustrated in FIG. 4C, the coating layer 220 is coated on the antenna pattern layer 200, the antenna first contact pattern layer 211, and the antenna second contact pattern layer 212. Here, the coating layer 220 is coated on the battery cover 200 including the antenna first contact pattern layer 211 and the front surface of the antenna pattern layer 200 except for the antenna second contact pattern layer 212. In other words, the antenna first contact pattern layer 211 is opened by the first contact open region 221, and the antenna second contact pattern layer 212 is coated by the second contact open region 222. It is open without being coated.

As shown in FIG. 4D, the first pad layer 231 is formed in the first contact open region 221, and the second pad layer 232 is formed in the second contact open region 222. In this case, the first pad layer 231 and the second pad layer 232 may be subjected to a plating process using black nickel plating, or after the black nickel plating, gold plating is added again, so that the antenna first contact pattern layer 221 may be The first pad layer 231 may be connected, and the antenna second contact pattern layer 222 may be connected to the second pad layer 232.

5A to 5F are views for explaining a state in which a loop antenna formed battery cover is coupled to a communication terminal according to the present invention.

As shown in FIGS. 5A and 5B, the loop antenna formed with the loop antenna according to the present invention is coupled to the communication terminal, the antenna pattern layer 210 and the first and second pad parts according to the third embodiment of the present invention. The battery cover layer 200 having the 231 and 232 formed therein is coupled to the communication terminal main body 400, and the battery coupling groove 410 is formed in the communication terminal main body 400, and the battery 300 First and second battery point points 310 and 320 are respectively connected to the first and second pad portions 231 and 232 of the antenna pattern layer 210 used as the loop antenna.

In this state, as shown in FIGS. 5C and 5D, first, the battery 300 is mounted in the battery coupling groove 410 of the communication terminal main body 400, and as shown in FIGS. 5E and 5F, the battery cover. The 200 is coupled to the communication terminal body 400.

Although the present invention has been described by way of example as described above, the present invention is not necessarily limited to these examples, and various modifications can be made without departing from the spirit of the present invention. Therefore, the examples disclosed in the present invention are not intended to limit the technical idea of the present invention but to explain the present invention, and the scope of the technical idea of the present invention is not limited by these examples. The scope of protection of the present invention should be interpreted by the following claims, and all technical ideas within the scope equivalent thereto should be construed as being included in the scope of the present invention.

1A to 1F are views for explaining a loop antenna forming method according to a first embodiment of the present invention;

2A to 2F are views for explaining the antenna pattern layer, the antenna first contact pattern layer and the antenna second contact pattern layer printing method shown in FIG. 1B;

3A to 3F are views for explaining a loop antenna forming method according to a second embodiment of the present invention;

4A to 4D are views for explaining a loop antenna forming method according to a third embodiment of the present invention;

5A to 5F are views for explaining a state in which a loop antenna formed battery cover is coupled to a communication terminal according to the present invention.

* Description of the symbols for the main parts of the drawings *

10: battery cover 20: antenna pattern layer

21 antenna first contact pattern layer 22 antenna second contact pattern layer

30: first coating layer 31, 32, 33: open area

40: second coating layer 51, 52: first, second pad layer

Claims (7)

Preparing a battery cover 10 made of a non-conductive material; An antenna pattern layer 20 formed in a loop shape from a central portion of one side of the battery cover 10 to an outer portion thereof, and an antenna connected to an outer end of an outer portion of the antenna pattern layer 20. Printing a first contact pattern layer (21) and an antenna second contact pattern layer (22) formed separately from the antenna pattern layer (20) on an outer portion of the antenna pattern layer (20); Plating the antenna pattern layer (20), the first contact pattern layer (21) and the second contact pattern layer (22); The antenna pattern layer 20 except for the bridge contact end 23 of the center portion of the battery cover 10 among the antenna first contact pattern layer 21, the antenna second contact pattern layer 22, and the antenna pattern layer 20. Coating the first coating layer 30 on the front surface using an insulating material; Printing a bridge pattern layer (24) connecting the antenna second contact pattern layer (22) and a bridge contact end portion (23) of a center portion of a battery cover (10) of the antenna pattern layer (20); Plating the bridge pattern layer (24); The second coating layer 40 using an insulating material on the entire surface of the antenna pattern layer 20 including the bridge pattern layer 24 except for the antenna first contact pattern layer 21 and the antenna second contact pattern layer 22. Forming a coating; And, Forming pad layers (51, 52) on each of the antenna first contact pattern layer (21) and the antenna second contact pattern layer (22); Loop antenna forming method comprising a. At least one side of the battery cover 200 made of a non-conductive material is spaced apart at a predetermined distance to form an antenna first contact pattern layer 211 and an antenna second contact pattern layer 212, and at one end of the antenna It extends from the first contact pattern layer 211 and is formed in a loop shape. The first contact pattern layer 211 surrounds the first contact pattern layer 211 and is formed from an inner portion to an outer portion of the battery cover, and the other end thereof is an antenna second contact pattern. Forming an antenna pattern layer 200 coupled to the layer 212; Coating a coating layer (220) on the battery cover (200) including the antenna first contact pattern layer (211) and the front surface of the antenna pattern layer (210) except for the antenna second contact pattern layer (212); And, Forming a first pad layer (231) on the antenna first contact pattern layer (211), and forming a second pad layer (232) on the antenna second contact pattern layer (212); Loop antenna forming method comprising a. The method according to claim 1 or 2, Copper plating is added on the antenna pattern layers 20 and 200, the antenna first contact pattern layers 21 and 211, the antenna second contact pattern layers 22 and 212, and the bridge pattern layer 24. Loop antenna forming method, characterized in that. The method according to claim 1 or 2, The pad layer (51) (52) (231) (232) is formed by black nickel plating or black nickel plating and gold plating. The method according to claim 1 or 2, Forming the antenna pattern layer (20, 210), the antenna first contact pattern layer (21) (211) and the antenna second contact pattern layer (22) (212), The antenna pattern layers 20 and 210, the antenna first contact pattern layers 21 and 211, and the antenna second contact pattern layers 22 and 212 may be formed on the battery covers 10 and 200. After defining the area, the pretreatment ink for imparting conductivity along the defined area is made of polycarbonate, polystyrene and acrylic rubber as the main ingredients, and cyclohexanone, butyl carbitle and toluene as solvents. Forming a printed layer printed with stirred ink; Forming a first metal layer formed by chemical plating on the printed layer; Forming a metal thin film by plating consisting of a second metal layer formed by electroplating on the first metal layer. The method according to claim 5, The ink is mixed at a ratio of 500 to 600 g of cyclohexanone, 500 to 600 g of butyl carbiter, and 200 to 400 g of toluene with respect to 1,000 g of a resin mainly containing one of the polycarbonate, polystyrene, and acrylic rubber. The cyclohexanone 500-600 g, the butyl carbiter 500-600 g, and the toluene 200-400 g are mixed with respect to 1,000 g of resin which has one of said polycarbonate, polystyrene, and acrylic rubber as a main component, 100-200 g of conductive carbon Added, With respect to 1,000 g of the resin containing a polycarbonate, polystyrene, or acrylic rubber as a main component, 500 to 600 g of cyclohexanone, 500 to 600 g of butyl carbitle, and 200 to 400 g of toluene are added to 100 g to 200 g of the conductive carbon. Loop antenna forming method characterized in that 50g ~ 100g is further added to the adhesion promoting binder. Defining a predetermined region of the battery cover 100 formed of a non-conductive material as a bridge pattern layer forming region and then printing the bridge pattern layer 110; Coating by using the first coating layer 120 so that one end of the bridge pattern layer 110 and the other end of the bridge pattern layer 110 are exposed; The antenna first contact pattern layer 131 is printed on one end of the outer edge of the battery cover 100 of the end of the bridge pattern layer 110, and at the same time spaced apart from the antenna first contact pattern layer 132 by a predetermined distance The second contact pattern layer 132 is printed, and at the same time, one end is connected to the other end of the bridge pattern layer 110 inside the battery cover 100 of the bridge pattern layer 110, and the other end is Forming an antenna pattern layer (130) formed in a loop shape across the first coating layer (120) and having an end thereof connected to the antenna second contact pattern layer (132); Coating the second coating layer 140 using an insulating material on the antenna pattern layer 130 and the bridge pattern layer 110 except for the antenna first contact pattern layer 131 and the antenna second contact pattern layer 132. Forming; And, Forming a first pad layer (151) on the antenna first contact pattern layer (131), and forming a second pad layer (152) on the antenna second contact pattern layer (132); Loop antenna forming method comprising a.

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