KR20040006617A - A laminated pattern antenna easy adjusting resonance frequency - Google Patents

Abstract

PURPOSE: An antenna coil for controlling a resonant frequency is provided to adjust correctly the inductance and the capacitance by improving a structure of an antenna coil. CONSTITUTION: An antenna coil for controlling a resonant frequency includes an insulating substrate(20), a spiral antenna coil(11), a first connection terminal(17), a connection line(14), a first connection terminal(12), and a second connection terminal(18). The spiral antenna coil(11) is formed with a main coil part of a first side of the insulating substrate(20) and a frequency control part. The first connection terminal(17) is formed at one end of the spiral antenna coil(11). The connection line(14) is formed at a second side of the insulating substrate. The first connection terminal(12) is used for connecting the connection line to the spiral antenna coil. The second connection terminal(18) is formed at the other end of the connection line in order to connect the spiral antenna coil to other electronic circuits.

Description

Antenna coil for electronic device which is easy to adjust resonance frequency {A laminated pattern antenna easy adjusting resonance frequency}

The present invention relates to a laminar antenna coil made of conductor flakes.

An antenna coil is an electronic component used when receiving or transmitting an electric wave in an electronic device, and a common technique has mainly been manufactured by winding an enameled copper wire.

However, antenna coils used in small products such as radio receivers or mobile communication terminals have been difficult to manufacture by conventional methods.

When the coil is manufactured by the conventional manufacturing method, since the enamelled copper wire is very thin, it is very difficult to work, and it is easily disconnected, resulting in poor product yield.

However, since the antenna coil has to be reduced in weight and size, the idea of fabricating the antenna coil in flakes using the latest photolithography technique is an electronic card inlet manufacture in the preliminary application 2002 patent applications 00219 and 00456 and 2000 patent application 16650. Described in the method.

That is, for example, the electronic card inlet includes an insulating substrate, connecting terminals, insulating tape, conductive adhesive tape, and the like. The manufacturing method includes a first step of attaching a conductive thin film to an insulating substrate. And a second step of fabricating a circuit element having connection terminals by patterning a conductor thin film, and determining a first terminal and a second terminal to be electrically connected to each other among the connection terminals, and between the first terminal and the second terminal. When the spiral circuit element is located in the third step of covering the circuit element between the first terminal and the second terminal with an insulating tape, and connecting the first terminal and the second terminal on the insulating tape with a conductive adhesive tape The manufacturing technique including the fourth step is described. However, such a process has a disadvantage in that automation is not easy and a lot of processes are required to produce a complicated shape.

In addition, the conventional enamelled linear antenna coil has a large variation in inductance and capacitance, making it difficult to match an accurate resonance frequency.

The present invention improves the problems of the conventional antenna coil, that is, difficult to manufacture, many defects due to disconnection, and lighting that is difficult to match an accurate resonant frequency, so that the manufacturing process is generally suitable for mass production, and the inductance and capacitance are accurately corrected. It is to provide a laminar antenna coil that can be fitted.

A method for manufacturing an antenna coil for an electronic device, in which the resonance frequency is easily adjusted, of the present invention, comprising: (1) attaching a photosensitive film on a conductive film attached to an insulating substrate, and (2) forming a spiral coil pattern. The photosensitive film is exposed, the exposed photosensitive film is developed, and the developed photosensitive film is exposed using a mask on which an antenna coil pattern having a main coil portion constantly rotating in one direction and a frequency adjusting portion rotating in a direction opposite to the first direction is developed. Using a mask as a mask to form an antenna coil pattern, and (3) attaching an insulating film cut out of a terminal portion to be electrically connected to the outside on both sides of the substrate.

Specifically, in the first step, through-holes are formed at positions where the connection terminals are to be formed by using the substrates with the first conductive film and the second conductive film on both sides of the heat transfer board, and a conductor film is formed on the sidewalls of the through-holes. Electrically connecting the first conductive film and the second conductive film, attaching a photosensitive film on the first conductive film and the second conductive film, exposing the coil pattern to the photosensitive film on the first conductive film in the second step, and After exposing the connecting line pattern to the photosensitive film on the conductive film, the developing and etching process is performed to form the connecting line with the antenna coil pattern.

A double-sided adhesive tape is attached to one side of the substrate and the antenna coil pattern is cut around the antenna coil pattern at predetermined intervals to manufacture an antenna coil for an electronic device that can easily adjust the resonance frequency.

An antenna coil for an electronic device, in which the resonance frequency of the present invention is easily adjusted, is rotated in an opposite direction from the first direction and the main coil portion constantly rotating in the first direction on the insulating substrate and the first surface of the insulating substrate. A helical antenna flake coil having a frequency adjusting portion, a first connecting terminal formed at one end of the helical antenna flake coil for connection to another electronic circuit, and an opposite position formed on a second surface of the insulating substrate, wherein the flake coil is formed A first connection terminal connecting the connecting wire formed by drilling the insulating substrate and the lamellae coil to connect one end of the connecting line and the other end of the lamellae coil, and to connect another electronic circuit and the lamellae coil. It comprises a second connection terminal formed on the other end of the connection line.

The connecting line connected to the first connecting terminal is formed to have a width wider than that of the other part of the antenna coil, and the first connecting terminal and the second connecting terminal are gold plated.

An insulating film is further attached on the coil tracks of the portions except the surfaces of the first connecting terminal and the second connecting terminal and on the connecting line.

1 is a plan view of a laminar antenna coil of the present invention.

2 to 5 are partial cross-sectional views illustrating a manufacturing process of manufacturing the antenna coil of the present invention.

** Brief Description of Reference Symbols **

11: laminar antenna coil, 12, 13, 15, 16: connector

17, 18: external circuit connection terminal, 20: insulating substrate, 21, 24: conductive film

112,114,116: through hole for connecting terminal

30: exposure mask for pattern formation 27: insulating film for antenna pattern protection

28, 29: plating film formed on an external connection terminal

61: main coil section 62: frequency control section

Hereinafter, one embodiment of the present invention will be described in detail.

Antenna coils used in electronic communication devices vary widely in resonant frequency and shape. Electronic device manufacturers require antenna coils of various shapes and performances having a predetermined size and resonant frequency.

The antenna coil to be manufactured by the method of the present invention is a very thin and small antenna coil used in an electronic device, a mobile communication terminal, a small radio, and the like. The antenna coil can be made in various forms, for example, as shown in FIG. Listen and explain.

First, as shown in FIG. 2, a drill is used to drill a portion to be used as a terminal by using a substrate having copper first and second conductive films 21 and 24 attached to both sides of the insulating substrate 20. Drill through-holes 112, 114, and 116 with the same device.

Then, the substrate on which the through hole is formed is plated to form a conductor film on the sidewall of the through hole. The conductive film 25 is also plated with copper so that the plated copper film is coated on the existing first conductive film and the second conductive film to be integrated, and the copper film is also coated on the sidewall of the through hole. Therefore, the first conductive film and the second conductive film attached to the upper and lower insulating substrates are electrically connected to each other through the through hole sidewall conductive film 25.

After doing this, as shown in FIG. 3, the photosensitive films 31 and 32 are attached to the first conductive film and / or the second conductive film, and are exposed using a mask 30 to form an antenna coil pattern on the photosensitive film. , Develop and etch.

In this case, the exposure mask uses a mask having an antenna coil pattern having a main coil portion that constantly rotates the spiral coil pattern in a first direction and a frequency adjusting portion that rotates in a direction opposite to the first direction. Thus, when the conductive coils 21 and 24 are etched to pattern the antenna coils, as shown in FIG. 1, a coil pattern having a main coil portion 61 and a frequency adjusting portion 62 is formed. A photo process is performed on the first conductive film 21 to form a pattern, and then a pattern is formed on the second conductive film 24 also using a photo process. At this time, the photo mask to be used may be the same shape as the pattern to be formed or the opposite shape depending on the nature of the photosensitive film.

After the etching of the conductive film to form a pattern, the photosensitive film is removed to form a pattern as shown in FIG. The plane of this pattern is the same as in FIG. One axial end of the antenna coil formed on the first substrate is electrically connected to the connecting line 14 formed under the insulating substrate 20 through the connecting terminal 12 ′ under the substrate formed integrally with the connecting terminal 12 formed thereon. Connected. The connection terminal 13 ′ formed at the other end of the connection line 14 is connected to the external connection terminal 16 through the connection terminal 13 and the connection line 19 formed on the substrate. The external connection terminal 16 is formed in the same shape up and down.

In order to protect the antenna pattern thus formed from the outside, insulating layers 26 and 27 are attached up and down. When the insulating film is attached to the substrate by cutting away the portion with the external connection terminals 18 and 18 'before attaching, only the connection terminal can be electrically connected to the outside of the insulating film.

After this, the plating process is carried out to form a plated film by plating the connection terminals with metal having better conductivity. It is good to plate with gold. The reason for doing this is because gold has better conductivity and better oxidation resistance than copper.

Next, attach the double-sided adhesive tape on only one side of the board. One side of the tape is attached to the coil and the other side is covered with release paper, so that the release paper can be removed and attached to the area where the antenna coil will be installed. will be.

After doing this, electrical inspection is performed, and a cutting process is performed to cut out only the antenna coil pattern. The insulation film in the center of the antenna may be left as it is, but in order to reduce the weight, the insulation film is cut out to form a tape ring-shaped antenna coil with a large hole in the center.

Here, a polyimide film is used for the insulating substrate and the insulating film.

Although an antenna coil in the shape of a running track is shown here, it can be made in any number of other forms, and another example is shown in FIG. In FIG. 6, the same reference numerals are given to parts having the same functions as those shown in FIG. Most of the manufacturing process is also the same as described above.

As shown in Figs. 1 and 6, the antenna coil manufactured in this way includes an insulating substrate 20, a main coil portion 61 which is constantly rotated in a first direction on the first surface of the insulating substrate, and a first coil. A spiral antenna lamella coil 11 having a frequency adjusting portion 62 that rotates in a direction opposite to one direction, and a first connecting terminal formed at one end of the spiral antenna lamella coil 11 for connection to another electronic circuit ( 17), the connecting line 14 formed on the second surface of the insulating substrate and positioned opposite to the lamellae coil, and the connecting line and lamella coil formed by drilling an insulating substrate to connect one end of the connecting line and the other end of the lamella coil. And a second connection terminal 18 formed at the other end of the connection line to connect other electronic circuits and flake coils.

Here, the first connection terminal 17 and the second connection terminal 18 are gold plated 28 and 29 to reduce connection resistance and prevent surface oxidation. All surfaces except the gold-plated surface are covered with insulating films 26 and 27 to protect the conductors.

If the connecting terminals are formed to be spaced apart from the outside and the inside of the antenna coil, the antenna pattern and the connecting terminal may be formed only on the first surface of the substrate, thereby simplifying the process. However, in order to form a pair of connection terminals side by side at the same site, the antenna coil end line inside the track of the coil must be electrically connected to the terminal next to the outside, and thus a connection line over the track is required. Or vice versa, the outer end of the antenna track shall be connected by means of a connecting line into the coil track in order to make two connection terminals side by side.

The connecting line for connecting the first connecting terminal to the connecting terminal outside the track has an effect of not being easily disconnected and increasing the capacitance if the width of the connecting wire is wider than that of the other part of the coil of the antenna track.

Portions other than the connection terminal are protected from the outside by an insulating film. This protective film may use a thin insulating plate or may be formed by applying an insulating varnish or an insulating paint.

The connecting terminal may be used as it is by patterning a conductive film attached to the insulating substrate. If the adhesive strength of the conductive film to the insulating substrate is insufficient, through holes are formed in the substrate and copper plating is performed in the same manner as the connecting terminal to electrically and mechanically connect the first conductive film and the second conductive film to increase the strength.

Various types of materials may be used for the insulating substrate and the insulating film, but a polyimide film is used in consideration of heat resistance and chemical stability.

Adhesive tape is used to attach the antenna coil to the device.The tape is attached to one side of the antenna assembly, and the surface of the antenna coil is attached to the attachment point when it is removed. It is convenient to be able to.

In order to help understand the antenna coil of the present invention will be described in detail the manufacturing process.

This manufacturing process first uses a substrate with copper first and second conductive films 21 and 24 attached to both sides of the insulating substrate 20, and penetrates the portion to be used as a terminal, as shown in FIG. Drill holes 112, 114 and 116.

Then, the substrate on which the through hole is formed is plated to form a conductor film on the sidewall of the through hole. The conductive film 25 is also plated with copper so that the plated copper film is coated on the existing first conductive film and the second conductive film to be integrated, and the copper film is also coated on the sidewall of the through hole. Therefore, the first conductive film and the second conductive film attached to the upper and lower insulating substrates are electrically connected to each other through the through hole sidewall conductive film 25. In this step, the entire substrate is plated to form a conductive film as shown, but the conductive film may be formed on the sidewalls of the through holes by plating only around the through holes.

Next, as shown in FIG. 3, the photosensitive films 31 and 32 are attached onto the first conductive film and / or the second conductive film, and exposed using a mask 30 to form an antenna coil pattern on the photosensitive film. Develop and etch the process. That is, the conductive film 21 and 24 are etched using the photosensitive film pattern as a mask to form an antenna coil pattern. A photo process is performed on the first conductive film 21 to form a pattern, and then a pattern is formed on the second conductive film 24 also using a photo process. At this time, the photo mask to be used may be the same shape as the pattern to be formed or the opposite shape depending on the nature of the photosensitive film.

After the etching of the conductive film to form a pattern, the photosensitive film is removed to form a pattern as shown in FIG. The plane of this pattern is as shown in FIG. One axial end of the antenna coil formed on the first substrate is electrically connected to the connecting line 14 formed under the insulating substrate 20 through the connecting terminal 12 ′ under the substrate formed integrally with the connecting terminal 12 formed thereon. Connected. The connection terminal 13 ′ formed at the other end of the connection line 14 is connected to the external connection terminal 16 through the connection terminal 13 and the connection line 19 formed on the substrate. The external connection terminal 16 is formed in the same shape up and down.

In order to protect the antenna pattern thus formed from the outside, insulating layers 26 and 27 are attached up and down. When the insulating film is cut off and adhered to the substrate with the external connecting terminals 18 and 18 'before being attached, only the connecting terminal can be electrically connected to the outside of the insulating film.

After this, the plating process is carried out to form a plated film by plating the connection terminals with metal having better conductivity. It is good to plate with gold or silver. The reason for doing this is because gold has better conductivity and better oxidation resistance than copper.

Next, attach the double-sided adhesive tape on only one side of the board. One side of the tape is attached to the coil and the other side is covered with release paper, so that the release paper can be removed and attached to the area where the antenna coil will be installed. will be.

The electrical inspection is performed, and a cutting process is performed to cut out only the antenna coil pattern. The insulation film in the center of the antenna may be left as it is, but in order to reduce the weight, the insulation film is cut out to form a tape ring-shaped antenna coil with a large hole in the center. Here, a polyimide film is used for the insulating substrate and the insulating film.

Here, the antenna coil in the shape of a running track is shown, but other shapes can be made.

Since the antenna coil of the present invention is a thin film, and the insulating substrate and the insulating film are also thin thin films, the shape of the surface on which the antenna is to be installed or attached can be freely selected by bending. In addition, since the structure is suitable for mass production, and it is easy to match the capacitance and the inductance, a reliable product can be produced. In particular, the main coil part and the frequency control part are formed to produce a coil suitable for the predetermined resonance frequency and antenna area, so that it is very convenient to match the shape, size and resonance frequency desired by the customer.

Such thin antenna coil is bulky and very light, so it can be used in mobile communication terminals to contribute to compact and light weight. In addition, it can be used in various small products, electronic cards, burglar alarms, and sign products.

Claims (16)

In the method for producing an antenna coil with easy to adjust the resonant frequency of the conductive foil, (1) attaching a photosensitive film on a conductive film attached to an insulating substrate; (2) exposing the photosensitive film by using a mask having a main coil portion which constantly rotates the spiral coil pattern in the first direction and an antenna coil pattern having a frequency adjusting portion that rotates in a direction opposite to the first direction, Developing an exposed photosensitive film and etching the conductive film using the developed photosensitive film as a mask to form an antenna coil pattern; (3) A method of manufacturing an antenna coil with easy resonance frequency adjustment, comprising the step of attaching an insulating film cut out of a terminal portion to be electrically connected to the outside on both sides of the substrate. The method of claim 1, In the first step (1), Through-holes are formed on both sides of the heat-transfer substrate using a substrate having the first conductive film and the second conductive film attached thereto, and a conductive film is formed on the sidewalls of the through-holes to form the first conductive film and the second conductive film. Electrically connecting the conductive film, attaching a photosensitive film on the first conductive film and the second conductive film, In the second step, The coil pattern is exposed to the photoresist film on the first conductive film, the connection line pattern is exposed to the photoresist film on the second conductive film, and the development and etching process is performed to form the antenna coil pattern and the connection line. Method of manufacturing antenna coil with easy frequency adjustment The method of claim 2, Method of manufacturing an antenna coil, which is easy to adjust the resonant frequency, characterized in that the plating process is added to the connection terminal portion electrically connected to the outside to form a plating film. The method according to any one of claims 1, 2, 3, Method of manufacturing an antenna coil with easy resonance frequency adjustment, characterized in that the first conductive film and the second conductive film are copper films The method of claim 4, wherein Method of manufacturing an antenna coil with easy resonant frequency, characterized by gold plating on the terminal part electrically connected to the outside The method of claim 4, wherein The method of manufacturing an antenna coil with easy resonance frequency adjustment, characterized in that the insulating substrate and the insulating film is a polyimide film. The method of claim 4, wherein Method of manufacturing an antenna coil that is easy to adjust the resonant frequency characterized by adding a step of attaching a double-sided adhesive tape on one side of the substrate The method of claim 7, wherein Method of manufacturing an antenna coil that is easy to adjust the resonant frequency characterized by adding a step of cutting around the antenna coil pattern at predetermined intervals An antenna coil with easy resonance frequency adjustment, Insulation board, A spiral coil coil having a main coil portion constantly rotating in a first direction on the first surface of the insulating substrate and a frequency adjusting portion rotating in a direction opposite to the first direction; A first connecting terminal formed at one end of the spiral antenna lamella coil for connection to another electronic circuit, A connection line formed on a second surface of the insulating substrate and positioned at an opposite position to the thin coil; A first connection terminal connecting the connection line formed by drilling the insulating substrate and the lamellae coil to connect one end of the connection line and the other end of the lamellae coil; An antenna coil for easy resonance frequency adjustment comprising a second connection terminal formed at the other end of the connection line to connect another electronic circuit and the lamella coil. The method of claim 9, And a second connection terminal formed at a position beyond the laminar coil where the first connection terminal is formed, and between the second connection terminal and the first connection terminal. The method of claim 9 or 10, The connecting wire connected to the first connecting terminal is wider than the width of the other conductor wire of the antenna coil, the antenna coil is easy to adjust the resonance frequency The method of claim 9 or 10, The first and second connection terminals, the surface is gold-plated, the antenna coil for easy resonance frequency adjustment The method of claim 9 or 10, The first connecting terminal, the second connecting terminal, the first connecting terminal, the second connecting terminal, and the laminar coil is made of copper, the antenna coil with easy resonance frequency adjustment The method of claim 9 or 10, And an insulating film formed on the coil tracks of the portions excluding the surfaces of the first and second connection terminals and on the connection lines. The method of claim 9 or 10, The second connection terminal has a third connection terminal which is connected to the connection line through the insulating substrate, the second connection terminal is characterized in that formed on the first surface of the same insulating substrate as the first connection terminal Adjustable antenna coil The method of claim 9 or 10, The antenna and the antenna coil is easy to adjust the resonant frequency characterized in that the insulating substrate and the insulating film is a polyimide film