KR100720939B1 - Fpcb and portable terminal with the fpcb - Google Patents

Abstract

The present invention relates to a flexible printed circuit board embodying a side key and an antenna, and a portable terminal having the same. The flexible printed circuit board includes a side key and a conductive first port connected to the side key. An extension part is formed in a direction opposite to a portion where a side key is formed, and the extension part is formed with an antenna part patterned in a predetermined shape, and a second conductive port is connected to the antenna part, and the second port is the second port. It is arranged with one port.

Description

Flexible printed circuit board and portable terminal with same {FPCB and portable terminal with the FPCB}

1A is a view for explaining the layout of a side key installed in a conventional portable terminal,

1B is an equivalent circuit diagram of FIG. 1A;

2A is a view for explaining a side key of another layout installed in a conventional portable terminal;

2B is an equivalent circuit diagram of FIG. 2A;

3 is a structural diagram of a flexible printed circuit board according to an embodiment of the present invention;

4 is an installation state of FIG.

5 is a structural diagram of a flexible printed circuit board according to another exemplary embodiment of the present invention.

<Description of Symbols for Major Parts of Drawings>

5, 10: Side keys 12a, 12b, 12c: First port

12d: Grounding port 40a, 60a: Second port

30. 50: flexible printed circuit board 35, 55: extension part

40: antenna unit 60: chip antenna

The present invention relates to a flexible printed circuit board and a portable terminal having the same, and more particularly, to a flexible printed circuit board provided with a side key and an antenna and a portable terminal employing such a flexible printed circuit.

Antennas currently used in portable terminals are mainly external antennas, which have a monopole antenna having a length of λ / 4 (λ is a wavelength of a used frequency) and an electrically corresponding length (λ / 4). Helical antenna having a helical form, or a retractable antenna is a combination of the two types of antenna.

However, such antennas have a structure that is basically mounted on the outside of the main body of the portable terminal has become a major obstacle in miniaturizing the portable terminal.

Therefore, in recent years, in pursuit of miniaturization of the antennas as described above, in the method of mounting the antennas, researches on the internal antennas that can mount the antennas inside the mobile terminal by moving away from the existing external type have been actively conducted. .

The technologies of these embedded antennas that have been advanced until recently are largely microstrip patch antenna technology using printed circuit technology, chip antenna technology using high dielectric ceramic material, and inverted F type. Antenna technology and the like.

However, in the case of the built-in antenna of this type, there is a fundamental problem in design that the deterioration characteristics of the antenna deteriorate as the antenna size decreases. In other words, the inverted-F antenna is a technique using a probe feeding method to the radiator, so the bandwidth is very narrow, so that the use of a wide bandwidth service is limited. Since chip antennas use high dielectric materials to reduce antenna size, they have a disadvantage in that the gain of the antenna is reduced, and most of them are surface-mounted on a PCB, so that the peripheral devices (eg, batteries) are used. , The characteristics of the slider, etc.) deteriorate due to the influence of the metal. In addition, the microstrip patch antenna technology using a printed circuit board (PCB) has the advantage that frequency tuning (tuning), bandwidth expansion, etc. are possible using various slot techniques and stacking techniques, but There is a disadvantage in that the volume of the antenna is greatly increased.

In addition, the chip antenna is currently used for DMB or Bluetooth, and when the space of the PCB is small, the chip antenna may be placed on a flexible printed circuit board (FPCB) of a mobile terminal. That is, as illustrated in FIGS. 1A and 1B, the side key 10 and the PCB (not shown) of the portable terminal are connected to each other by the FPCB 20, which is separate from the FPCB 20. Is additionally provided on the inner outer side (ie, side) of the portable terminal, and the chip antenna is installed on the upper surface of the separate FPCB. 1 shows a case where there are two side keys 10, so that if there is only one side key, Figs. 2A and 2B are employed. The side key is used when a simple button input such as volume control or date conversion is required. In FIGS. 1A and 1B, reference numerals 12a, 12b, and 12c are conductive ports, one end of which is connected to the side key 10 and the other end of which is connected to the PCB. In FIGS. 1a and 1b, reference numeral 12d is connected to the PCB. Conductive grounding port. 2A and 2B, reference numerals 17a and 17b are conductive ports, one end of which is connected to the side key 5 and the other end of which is connected to the PCB, and in FIGS. 2a and 2b, reference numeral 17c is connected to the PCB. Grounding port of

However, in the conventional case where the chip antenna is mounted on a separate FPCB installed on the side of the mobile terminal, a process for connecting the chip antenna to the separate FPCB is required, and in this process, the connection between the chip antenna and the FPCB is poor. You may.

Since two FPCBs, that is, FPCBs for side keys and FPCBs for chip antennas, are provided on the side of the portable terminal, the manufacturing process of the portable terminal is complicated and cumbersome.

When the chip antenna is mounted on the FCPB and the FPCB is installed on the side of the mobile terminal, the size of the mobile terminal is inevitably large because the space of at least the thickness of the FPCB and the thickness of the chip antenna must be secured. Occurs.

In the conventional case of using the chip antenna on the FPCB of the mobile terminal, there are inconveniences in that two soldering processes must be performed separately. In other words, the ports 12a, 12b, 12c, 12d; 17a, 17b, and 17c formed on the existing FPCBs 20 and 15 for interconnecting the side keys 10 and 5 to the PCB (not shown) are connected to each other. The first soldering process, which requires manual soldering of the corresponding terminals (not shown), and the port and PCB of the chip antenna mounted on a separately added FPCB (not shown) to interconnect the chip antenna (not shown) and the PCB. Each second soldering process must be carried out by hand soldering of the corresponding terminals. As described above, the soldering process has to be performed separately over two times, so that the soldering process is very inconvenient and a lot of soldering defects are generated.

In addition, in the conventional case of using the chip antenna on the FPCB of the portable terminal, a process for connecting the chip antenna to the FPCB is required, and in this process, the connection between the chip antenna and the FPCB may be poor.

The present invention has been proposed to solve the above-described problems, and an object thereof is to provide a flexible printed circuit board having a side key and an antenna together and a portable terminal having the same.

In the flexible printed circuit board according to a preferred embodiment of the present invention in order to achieve the above object, in the flexible printed circuit board is formed with a side key, the conductive first port is connected to the side key,

An extension portion is formed in a direction opposite to the portion where the side key is formed, and the extension portion is formed with an antenna portion patterned in a predetermined shape, and the antenna portion is connected with a conductive second port, and the second port is And arranged with the first port.

In the flexible printed circuit board according to another embodiment of the present invention, a side key is formed, and in the flexible printed circuit board having a conductive first port connected to the side key,

An extension part is formed in a direction opposite to the portion where the side key is formed, a chip antenna is formed on the extension part, and a second conductive port is connected to the chip antenna, and the second port is connected with the first port. Characterized in that arranged.

On the other hand, the portable terminal of the present invention includes a flexible printed circuit board having the above-described configuration.

Hereinafter, a flexible printed circuit board and a portable terminal having the same will be described with reference to the accompanying drawings. Hereinafter, the case where two contacts of the side key are described will be described as an example.

3 is a structural diagram of a flexible printed circuit board according to an exemplary embodiment of the present invention.

In the flexible printed circuit board 30 of FIG. 3, a side key 10 is formed at one side thereof. In the central portion, conductive first ports 12a, 12b, and 12c, and grounding conductive ports 12d, one end of which is connected to the side key 10 and the other end of which is connected to a PCB (not shown) are formed. In addition, the extension part 35 is formed in a direction opposite to the one side part on which the side key 10 is formed.

The extension part 35 is provided with an antenna part 40 patterned in a zigzag shape having the same line width. The antenna unit 40 is preferably embedded in the extension 35. Of course, the antenna portion 40 may be formed on one surface of the extension portion 35, in which case the gold plating is performed.

A conductive second port 40a is connected to the antenna unit 40, and the second port 40a is connected to the first ports 12a, 12b and 12c at the center of the flexible printed circuit board 30. It is arranged together with the conductive port 12d for grounding.

The antenna unit 40 receives and radiates radio waves of a predetermined operating frequency band (for example, terrestrial DMB band, satellite DMB band, and Bluetooth band).

In FIG. 3, the antenna unit 40 is installed at a portion opposite to the side key 10 in order to minimize the influence of the coupling between each other. Of course, if the influence of the coupling is not greatly considered, the antenna portion 40 may be installed in any form at the position where the side key 10 is located, but the influence of the coupling while fully utilizing the free space of the side of the portable terminal. Description of the above-described embodiments of the present invention that can minimize the most suitable.

4 is a state diagram in which the flexible printed circuit board illustrated in FIG. 3 is installed in a portable terminal. In FIG. 4, a flexible printed circuit board 30 is installed on the PCB 80, with the portable terminal not shown, centering on the PCB 80 provided in the portable terminal.

According to FIG. 4, the flexible printed circuit board 30 is embedded in the side portion of the portable terminal, that is, the portion where the side key is installed. Ports 12a, 12b, 12c, 12d, and 40a located in the center portion of the flexible printed circuit board 30 are connected to the corresponding terminals of the PCB 80.

The side of the portable terminal has not only a space for accommodating side keys, but also an unused free space. Accordingly, the flexible printed circuit board 30 of FIG. 4 is embedded in the side of the portable terminal. In particular, the extension part 35 of the flexible printed circuit board 30 is located in the free space in the longitudinal direction from the side of the portable terminal. It is built.

In FIG. 4, reference numeral 70 denotes a main antenna unit and has a different operating frequency band from that of the antenna unit 40 of the flexible printed circuit board 30.

5 is a structural diagram of a flexible printed circuit board according to another exemplary embodiment of the present invention.

In the flexible printed circuit board 50 of FIG. 5, a side key 10 is formed at one side thereof. In the central portion, conductive first ports 12a, 12b, and 12c, and grounding conductive ports 12d, one end of which is connected to the side key 10 and the other end of which is connected to a PCB (not shown) are formed. In addition, the extension part 55 is formed in a direction opposite to the one side part on which the side key 10 is formed.

The extension part 55 is provided with a chip antenna 60. A conductive second port 60a is connected to the chip antenna 60, and the second port 60a is connected to the first ports 12a, 12b and 12c at the center of the flexible printed circuit board 50. It is arranged together with the conductive port 12d for grounding.

The chip antenna 60 receives and radiates radio waves of predetermined operating frequency bands (eg, terrestrial DMB band, satellite DMB band, and Bluetooth band).

When the structure of FIG. 5 is connected to the PCB 80 of FIG. 4, the flexible printed circuit board 50 is embedded in the side of the portable terminal, and in particular, the extension portion of the flexible printed circuit board 50 ( 55 is embedded in the free space in the longitudinal direction of the side of the portable terminal. In this case, the operating frequency band of the chip antenna 60 is different from the operating frequency band of the main antenna unit 70.

In FIG. 5, the chip antenna 60 is installed at a portion opposite to the side key 10 in order to minimize the influence of the coupling between each other.

On the other hand, the present invention is not limited only to the above-described embodiment, but can be modified and modified within the scope not departing from the gist of the present invention, the technical idea to which such modifications and variations are also applied to the claims Must see

As described in detail above, according to the present invention, it is possible to simultaneously form a side key and an antenna in one FPCB, so that a conventional separate FPCB is not required, and thus, the manufacturing process of the FPCB is very simple.

And, it is common to install side keys on the side of the mobile terminal using the FPCB, but the present invention is to increase the area of the FPCB on which the side keys are installed slightly so that the side space of the portable terminal on which the side keys are installed is used as it is. It is possible to secure a size smaller than that of a conventional portable terminal.

In addition, one soldering process allows the side keys and antenna to connect to the PCB. Therefore, the soldering process is easier than in the related art, and the soldering failure rate is lowered, thereby improving the reliability of the product.

In addition, the side keys are essential in recent portable terminals, and the side keys are placed on the outer side of the PCB board by placing them on the FPCB. In the present invention, the characteristics of the antenna are improved by placing the antenna on the outermost side of the PCB board. There is an improvement effect.

Claims (4)

A side key is formed at one side, and a conductive first port having one end connected to the side key is formed at a central portion, and an extension portion is formed at the other side in a direction opposite to the one side. The extension portion is formed with an antenna portion patterned in a predetermined shape, one end of the conductive second port is connected to the antenna portion, the second port is characterized in that arranged in the central portion with the first port Flexible printed circuit boards. The method of claim 1, The antenna unit is a flexible printed circuit board, characterized in that consisting of a zigzag pattern. A side key is formed at one side, and a conductive first port having one end connected to the side key is formed at a central portion, and an extension portion is formed at the other side in a direction opposite to the one side. A chip antenna is formed in the extension portion, and one end of the conductive second port is connected to the chip antenna, and the second port is arranged in the central portion together with the first port. A portable terminal comprising the flexible printed circuit board according to any one of claims 1 to 3.

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