KR20080093742A - Mobile terminal - Google Patents

Abstract

A mobile terminal is provided to make it possible to receive a signal whose frequency is low as well as to get small sized and slim. A mobile terminal includes a main PCB(130) and an assistant PCB(140). The main PCB includes a ground unit which is the first electric conduction face. A signal connection line(500) passes a back lower part of the main PCB and gets connected to the assistant PCB. In this case, a ground unit is not formed in a part over the back lower part of the main PCB where the signal connection line passes in order to reduce parasitic capacitance. Though the first electric conduction face is not a ground unit of the main PCB, the ground unit is not formed in a part over the back lower part of the main PCB where the signal connection line passes in order to reduce parasitic capacitance.

Description

Mobile terminal {MOBILE TERMINAL}

1 is a block diagram of a mobile terminal according to an embodiment of the present invention.

Figure 2 is a schematic exploded perspective view of the first body of one embodiment of the present invention.

3 is a schematic diagram of a main printed circuit board and an auxiliary printed circuit board provided in the first body of FIG.

4 is a schematic exploded perspective view of a second body of one embodiment of the present invention;

5-7 are schematic diagrams of an example of a second conductive surface of one embodiment of the present invention.

Figure 8 is a schematic side view of one embodiment of the present invention.

Figure 9 is a schematic plan view of the main part of Figure 8;

FIG. 10 is a schematic equivalent circuit diagram considering an image effect caused by a first conductive surface according to an embodiment of the present invention. FIG.

Figure 11 is a schematic rear view of another embodiment of the present invention corresponding to Figure 9;

<Description of the symbols for the main parts of the drawings>

10: control unit 20: memory unit

30: audio processing unit 40: communication module

50: Input unit 52: Character key button

54: Function key button 60: Antenna

70: bus

100: first body 110: upper case

120: lower case 130: main printed circuit board

140: secondary printed circuit board

200: second body 210: upper case

220: lower case 230: display

230-1: main display panel 230-2: secondary display panel

230-3: second printed circuit 232: bracket

234: metal plate 236: conductive paint

300: hinge 310: side hinge arms

320: center hinge arm 321: left hinge axis

400: power supply line 500: signal line

600: Connector

The present invention relates to a mobile terminal, and more particularly, having a first conductive surface and a second conductive surface forming a predetermined area, so that the first conductive surface to act as a ground and the second conductive surface to act as a monopole antenna It relates to a mobile terminal.

The mobile terminal is one of portable electronic devices that allow the mobile terminal to view or process wireless transmission and reception or information using the mobile terminal while moving.

While such mobile terminals become lighter and slimmer for users to carry with ease, various component elements must be mounted to implement various functions in a small and limited space while simultaneously requiring high wireless communication performance.

On the other hand, in recent years, the mobile terminal is preferably a built-in antenna in consideration of the design aspect, but as the size and thickness of the mobile terminal is reduced, the size of the mobile terminal is reduced and the thickness of the mobile terminal becomes smaller, so the space required by the built-in antenna becomes smaller. The disadvantage is that performance is difficult to achieve. Particularly, in order to receive a digital broadcast having a very low frequency, a relatively large antenna space is required as compared to a built-in antenna used in a conventional mobile terminal, and at the same time, it is difficult to meet the requirements of miniaturization and slimming of a mobile terminal.

An object of the present invention is to provide a mobile terminal having an antenna capable of receiving a signal having a low frequency while meeting the trend of miniaturization and slimming of a mobile terminal.

The present invention provides a communication module, a first conductive surface formed on the first body of the terminal, a second conductive surface formed on the second body of the terminal, and the second conductive surface to operate as a monopole antenna. And it relates to a mobile terminal, characterized in that it comprises a feed line for connecting the second conductive surface.

In the present invention, it may also include a ground connection line connecting the first conductive surface and the second conductive surface.

The present invention connects a first printed circuit board provided in the first body, a display provided in the second body, and the first body and the second body to open and close the first body. It may also include a hinge.

In the present invention, a predetermined portion of the hinge may form part of the feed connection line.

In the present invention, the signal connection line electrically connecting the first printed circuit board and the display may form part of the ground connection line.

In the present invention, the signal line is also a flexible printed circuit board having an L value and a C value that can be matched for a specific frequency.

In the present invention, in order to reduce the parasitic capacitance, the first conductive surface may be formed in an area except for areas corresponding to upper and lower portions of the portion introduced into the first body of the signal connection line.

In an embodiment of the present invention, the first printed circuit board includes a main printed circuit board and an auxiliary printed circuit board connected to a lower end of a rear surface of the main printed circuit board through a connector, and the signal connection line is the auxiliary printed circuit board. It may also be connected to a first conductive surface formed on the main printed circuit board by being connected to a circuit board.

In the present invention, the first conductive surface may be any one of a ground portion of the first printed circuit board, a metal plate attached to the rear surface of the first printed circuit board, and a conductive paint formed on the first body.

In the present invention, the second conductive surface is formed on the bracket provided on the display, the ground portion of the auxiliary printed circuit board provided on the display, the metal plate located on the back of the auxiliary printed circuit board, and the conductive body formed on the second body. It is also one of the paints.

Hereinafter, an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

1 is a block diagram of a mobile terminal according to an embodiment of the present invention. Referring to Figure 1 describes the basic functions of the components of the mobile terminal according to an embodiment of the present invention.

The mobile terminal of FIG. 1 includes a control unit 10, a memory unit 20, an audio processing unit 30, a communication module 40, an input unit 50, an antenna 60, and a display 70. Each of these components is connected by a bus 80.

The control unit 10 controls the above components and controls the overall operation of the mobile terminal according to an embodiment of the present invention.

The memory unit 20 stores a predetermined program for controlling the overall operation of the mobile terminal according to an embodiment of the present invention, and the control unit 10 controls the overall operation of the mobile terminal according to the embodiment of the present invention. When this is performed, the data input and output and the various data processed are stored.

The audio processor 30 processes audio to input and output audio through the microphone MIC and the speaker SPK. The audio processor 30 outputs various processing and control operations of the mobile terminal according to an embodiment of the present invention as audio through the speaker SPK, or inputs various information or commands as audio through the microphone MIC. Process the audio.

The communication module 40 is a wireless communication device for transmitting and receiving data with a predetermined wireless communication network. Examples of the wireless communication network include a mobile communication network such as CDMA or GSM, a broadcasting network.

The input device 50 is a device for receiving various information or commands from a user, and is a device for receiving various information or commands by an external operation. The input device 50 may include a text key button, a function key button, a touch pad, and the like.

The antenna 60 is a device that enables the communication module 40 to process the received data by transmitting data processed by the communication module 40 through a mobile communication network or by receiving data through the mobile communication network. The antenna 60 includes a monopole antenna made of a second conductive surface described later and a main antenna 150.

The display 70 is a device for displaying the state or various information of the mobile terminal according to an embodiment of the present invention by a control signal output from the controller 10.

2 is a schematic exploded perspective view of a first body according to an embodiment of the present invention, and FIG. 3 is a schematic view of a main printed circuit board and an auxiliary printed circuit board provided in the first body of FIG.

Referring to FIG. 2, an embodiment of the present invention has a first body 100. The first body 100 includes an upper case 110 and a lower case 120.

Referring to FIG. 2, the input unit 50 is exposed and formed on the upper surface of the upper case 110. The input unit 50 may include a normal character key button 52 and a function key button 54.

2 and 3, the first body 100 may include a main printed circuit board 130 and an auxiliary printed circuit board 140. In addition, a main antenna 150 may be provided. The main printed circuit board 130 is a printed circuit board (PCB) on which a plurality of circuit elements for operating a mobile terminal are mounted. In this case, the auxiliary printed circuit board 140 may be located under the rear surface of the main printed circuit board 130, and the main antenna 150 may be located at the lower end of the first body 100. On the other hand, the auxiliary printed circuit board 140 may be provided at the lower end of the rear surface of the main printed circuit board 130 and may be connected to the main printed circuit board 130 by the connector 600 (see FIG. 8).

On the other hand, the first body 100 is provided with a first conductive surface (not shown). The first conductive surface (not shown) includes at least one flat or curved surface made of a conductive material.

In the exemplary embodiment of the present invention, the ground portion GND is typically formed on the main printed circuit board 130, and the first conductive surface may be the ground portion of the main printed circuit board 130. In addition, in an exemplary embodiment of the present invention, a metal plate of a thin metal material may be provided under the bottom of the main printed circuit board 130, in which case the first conductive surface may be the metal plate. In addition, in an exemplary embodiment of the present invention, a conductive paint may be applied to the bottom inner surface of the lower case 120. In this case, the first conductive surface may be the conductive paint. In the case of an embodiment according to the present invention, the first conductive surface may be formed in various forms, and is not limited to the above example. That is, any one or more of the conductive surfaces formed on the first body 100 may be used as the first conductive surface.

2, the embodiment of the present invention has a communication module 40. The communication module 40 is provided on the main printed circuit board 130. The communication module 40 is a communication related device for data transmission and reception with a mobile communication network or a broadcast communication network.

Figure 4 shows a schematic exploded perspective view of a second body of one embodiment according to the present invention.

Referring to FIG. 4, an embodiment of the present invention has a second body 200. The second body 200 includes an upper case 210 and a lower case 220. The second body 200 is provided with a display 230, and the display 230 may be a dual LCD. Therefore, the upper case 210 may be formed with a through hole (not shown) so that one surface of the dual LCD is exposed to the outside.

Meanwhile, one embodiment of the present invention has a second conductive surface. The second conductive surface includes at least one flat or curved surface made of a conductive material.

5-7 show schematic diagrams of an example of a second conductive surface of one embodiment of the present invention.

Referring to FIG. 5, the mobile terminal may include a bracket 232 to fix and install the display 230. In an exemplary embodiment of the present invention, the bracket 232 may be formed of a metal material. It can be used as a second conductive surface. The bracket 232 has a variety of forms, and is not limited to that shown in FIG.

Referring to FIG. 6, the display 230 includes a main display panel 230-1, an auxiliary display panel 230-2, and a second printed circuit board 230-3. The second printed circuit board 230-3 is a printed circuit board (PCB) in which component elements (not shown) for displaying various images are mounted on the main display panel 230-1 and the auxiliary display panel 230-2. )to be. The second printed circuit board 230-3 is equipped with the above-described component elements (not shown), and signal lines for signally connecting the component elements (not shown) are also patterned. As a result, the ground portion GND 230-3G is formed. In an exemplary embodiment of the present invention, the ground portion 230-3G of the second printed circuit board 230-3 may be a second conductive surface. The ground portion 230-3G formed on the second printed circuit board 230-3 may be in various forms, and is not limited to that shown in FIG. 5. That is, the ground portion 230-3G may be formed on a surface of the second printed circuit board 230-3 that is positioned on the side of the auxiliary display panel 230-2.

Referring to FIG. 6, a thin metal plate 234 may be provided on a surface of the second printed circuit board 230-3 that is positioned on the side of the auxiliary display panel 230-2. In this case, the metal plate 234 may be a second conductive surface.

Referring to FIG. 7, the conductive coating 236 may be applied to the first case 210 of the second body 200. In this case, the conductive paint 236 may be the second conductive surface.

The second conductive surface according to the present invention has a variety of forms, and is not limited to the above example. That is, any one or more of the conductive surfaces formed on the second body 200 may be used as the second conductive surface.

2 and 3, in an exemplary embodiment of the present invention, the second body 200 may be hinged to the first body 100. In this case, the second body opens and closes the first body 100 by rotating the hinge about its axis. The hinge may be a side hinge arm 310 formed on the first body 100 and a center hinge arm 320 formed on the second body 200.

2 and 4, an embodiment of the present invention has a feed connection line 400. The feed connection line 400 is a connection line connecting the communication module 400 and the second conductive surface so that the second conductive surface operates as a monopole antenna.

Figure 8 shows a schematic side view of one embodiment of the present invention.

Referring to FIG. 8, the feed connection line 400 may form a predetermined portion of the hinge 300 as a conductor, and configure the hinge 300 as a part of the feed connection line 400. That is, a conductive paint is applied to the inside of the left side hinge arm 310 shown in FIG. 2, and the outer surface of the left hinge shaft 321 of FIG. 4 is formed of a conductor, and the feed connection line 400 shown in FIG. ) May be electrically connected to the feed line 400 shown in FIG. 4 through the conductive paint applied to the inside of the left side hinge arm 310 and the left hinge shaft 321. In the embodiment of the present invention, the shape of the feed connection line 400 is not limited to the above. The feed connection line 400 may not be a portion of the hinge 300 as a part thereof, and in this case, the feed connection line 400 may be a conductive wire passing through the hinge 300 of the feed connection line 400.

One embodiment of the present invention may have a ground connection line. The ground connection line is a connection line connecting the first conductive surface and the second conductive surface to enable energization. 3 and 4, in an exemplary embodiment of the present invention, the main printed circuit board 130 and the display 230 have a signal connection line 500 electrically connecting the signal connection line 500 to a part of the ground connection line. Configure That is, the signal connection line 500 is responsible for a part of the ground connection line. Meanwhile, the signal connection line 500 may be a flexible printed circuit board (FPCB).

Fig. 9 shows a schematic plan view of the main part of Fig. 8;

3, 8, and 9, in an exemplary embodiment of the present invention, the first conductive surface is a ground of the main printed circuit board 130, and the signal connection line 500 is a rear surface of the main printed circuit board 130. It may be connected to the auxiliary printed circuit board 140 through the lower portion. In this case, a grounding portion is not formed in an area corresponding to an upper portion of the main printed circuit board 130 through which the signal connection line 500 introduced into the first body 100 passes. This is to reduce the parasitic capacity (Parasitic Capacitance). This also applies to the case where the first conductive surface is not the ground portion of the main printed circuit board 130 in order to reduce the parasitic capacitance.

FIG. 10 is an equivalent circuit diagram in which an image effect caused by the first conductive surface 100C is considered in an embodiment of the present invention. Due to the magnetic wave generated in the second conductive surface 200C, current is induced in the first conductive surface 100C, and thus magnetic waves are generated in the first conductive surface 100C. An equivalent circuit diagram like 10 can be constructed.

Referring to FIG. 10, L and C are inductances and capacitances of the signal connection line 500 when the signal connection line 500 forms part of the ground connection line. When the signal connection line 500 is a flexible printed circuit board, L and C represent inductances and capacitances of the flexible printed circuit board. The matching part represents a circuit device including an inductance and capacitance according to an internal structure of another mobile terminal, a dielectric such as air, and the like. In the exemplary embodiment of FIG. 10, the flexible printed circuit board, which is the signal connection line 500, is formed to have a width and a length that can be matched for a specific frequency. Meanwhile, in the exemplary embodiment of the present invention, even when the signal connection line 500 is not a flexible printed circuit board, the signal connection line constituting a part of the ground connection line may be matched with respect to a specific frequency with respect to a predetermined matching part. It is formed to have L and C.

In the above-described embodiment, the signal connection line 500 constitutes a part of the ground connection line. However, in another embodiment, the signal connection line 500 does not necessarily constitute a part of the ground connection line. In this case, in the equivalent circuit of FIG. 10, L and C between the first conductive surface 100C and the second conductive surface 200C are replaced with L and C of the ground connection line, and L and C of the signal connection line 500. C is included in the matching part.

FIG. 11 is a schematic plan view of essential parts of another embodiment of the present invention corresponding to FIG. Referring to FIG. 11, another embodiment of the present invention may not include the auxiliary printed circuit board 140 of the above-described embodiment. That is, in the present invention, the first printed circuit board provided in the first body may be one main printed circuit board. Even in this case, the signal wires forming part of the ground wire should be formed to have matching L and C for a specific frequency.

Terrestrial Digital Multimedia Broadcasting (TDMB) uses a low frequency, and therefore, a handset having a length much longer than a conventional hand set length is required to receive TDMB. Therefore, referring to FIG. 8, in the exemplary embodiment of the present invention, a flexible printed circuit board (FPCB) in which the hinge 300 and the second conductive surface are connected in series, directly feed through the hinge 300, and the signal connection line 500 are provided. ) Is connected to the power supply connection line 400 to the far side, and by adjusting the length and width of the flexible printed circuit board (FPCB) it is possible to match for a specific low frequency when opening the second body (200).

In addition, when the second body 200 is opened, the first conductive surface is not formed at a portion overlapping the flexible printed circuit board (FPCB), which is the signal connection line 500, thereby reducing the amount of parasitic capacitance to reduce radiation performance. It can be improved.

The present invention has an advantage of not having to counter the trend of miniaturization and slimming of a mobile terminal, while having an antenna superior in receiving a signal having a low frequency.

Claims (10)

Communication module, A first conductive surface formed on the first body of the terminal; A second conductive surface formed on the second body of the terminal; And a feed connection line connecting the communication module and the second conductive surface so that the second conductive surface operates as a monopole antenna. The method of claim 1, And a ground connection line connecting the first conductive surface and the second conductive surface. The method according to claim 1 or 2, A first printed circuit board provided in the first body; A display provided in the second body; And a hinge connecting the first body and the second body to open and close the first body. The method of claim 3, And a predetermined portion of the hinge constitutes a part of the feed connection line. The method of claim 4, wherein And a signal connection line electrically connecting the first printed circuit board and the display constitute a part of the ground connection line. The method of claim 5, The signal connection line is a mobile terminal, characterized in that the flexible printed circuit board having an L value and a C value that can be matched for a specific frequency. The method of claim 5, In order to reduce parasitic capacitance, the first conductive surface is formed in an area except for areas corresponding to upper and lower portions of a portion of the signal connection line flowing into the first body. The method of claim 5, The first printed circuit board includes a main printed circuit board, and an auxiliary printed circuit board connected to a lower end of a rear surface of the main printed circuit board through a connector. And the signal connection line is connected to a first conductive surface formed on the main printed circuit board by being connected to the auxiliary printed circuit board. The method of claim 5, And the first conductive surface is any one of a ground portion of the first printed circuit board, a metal plate attached to a rear surface of the first printed circuit board, and a conductive paint formed on the first body. The method of claim 5, The second conductive surface may be any one of a bracket provided on the display, a ground portion of the auxiliary printed circuit board provided on the display, a metal plate disposed on the rear surface of the auxiliary printed circuit board, and a conductive paint formed on the second body. Mobile terminal, characterized in that.

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