KR20050010100A - Device for reducing specific absorption rate in portable handheld radiotelephone - Google Patents

Abstract

PURPOSE: An apparatus for lowering the SAR(Specific Absorption Rate) of a mobile phone is provided to achieve the miniaturization and thinning of a mobile terminal and to effectively lower the SAR. CONSTITUTION: An apparatus for lowering the SAR of a mobile phone is installed on an opening/shutting axis, opened and closed on a main body. At the opening/shutting axis, a hinge module(10) for opening a sub body on the main body at regular angles is installed. The hinge module(10) has a hinge housing and a hinge shaft(11). The hinge shaft(11) is partially protruded from the hinge housing. The hinge shaft(11), protruded from the hinge housing, is fixed to a hinge dummy(20). The hinge dummy(20) has a protrusion piece(21). An RF board(30) having a ground terminal(31) is provided on the main body. A plate spring(40) is provided to connect the protrusion piece(21) of the hinge dummy(20) with the ground terminal(31) of the RF board(30) electrically. One end of the plate spring(40) is contacted with the protrusion piece(21), and the other end is contacted with the ground terminal(31).

Description

Electromagnetic wave absorptivity reduction device of portable wireless terminal {DEVICE FOR REDUCING SPECIFIC ABSORPTION RATE IN PORTABLE HANDHELD RADIOTELEPHONE}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a portable radio terminal, and more particularly, to an apparatus for reducing electromagnetic wave absorption of a portable radio terminal for reducing a strong current density harmful to a human body emitted through a contact portion of a main body and a sub body in an antenna device.

Recently, due to the rapid dissemination of portable wireless terminals and the development of various electronic industries, devices for shielding electromagnetic waves or reducing electromagnetic wave absorption rate, which are harmful to the human body, have gradually emerged. In particular, the Specific Absorption Rate (SAR) is used in human body protection standards as a measure of the amount of electromagnetic waves absorbed by the human body (head).

In general, the portable terminal is used in close contact with the human body (head), the electromagnetic wave absorption rate is affected by the near field (near field) of radio waves emitted from the antenna device of the terminal. Therefore, it will be said that there is a close relationship with the transmission power, the antenna characteristics, and the shape of the apparatus of the radio terminal to be used.

As a method of reducing the electromagnetic wave absorption rate as described above, a method of using a directional antenna device or attaching a separate conductor plate to shield the radio wave or inserting a radio wave absorber (conductive paint) was used.

However, the method of using a directional antenna device is very complicated in its configuration, which causes a problem that is gradually reversed to the miniaturized and thin terminal market, and the method of using a shielding material or an absorber has the characteristics of the material and its attachment location. Depending on the effect, the manufacturing process is also a problem that becomes complicated. In addition, when connecting the ground and the hinge portion of the main body, when the conductive film is used, there is a problem that the resistance value between the shaft pile and the ground is not constant or contact failure occurs.

In order to solve the problems as described above, an object of the present invention is to form a hinge module of a metallic material in order to reduce the strong current density radiated from the antenna device and to configure the conductive film through mechanical connection to the power supply means It is an object of the present invention to provide an electromagnetic wave absorptivity reduction apparatus of a portable radio terminal configured to solve problems such as poor contact when used.

Another object of the present invention is to provide an electromagnetic wave absorption reduction apparatus of a portable radio terminal, which is configured to reduce the strong current density induced from the antenna device on the surface of the terminal.

Still another object of the present invention is to provide an apparatus for reducing electromagnetic wave absorption of a portable radio terminal, which is configured to maintain a ground state at all times with only a simple structure.

1 is a perspective view showing the configuration of a portable radio terminal;

Figure 2 is a schematic diagram showing a state in which the electromagnetic wave absorption rate reduction apparatus according to the present invention is installed in the terminal;

Figure 3 is an exploded perspective view of the electromagnetic wave absorption rate reduction apparatus according to the present invention;

Figure 4 is a side view showing a state in which the electromagnetic wave absorption rate reduction apparatus according to the present invention is installed in the terminal; And

Figure 5 is a side view showing a state in which the electromagnetic wave absorption rate reduction apparatus according to another embodiment of the present invention is installed in the terminal.

<Description of Major Symbols in Drawing>

10: hinge module 20: pile of hinges

30: printed circuit board (PCB) 40: plate-type spring

50: ball plunger

In order to solve the above object of the present invention, the present invention is a portable wireless terminal comprising a main body having a printed circuit board, and a sub body installed to be opened and closed by a predetermined hinge module on the main body. The hinge module may be formed of a conductive material, and the ground terminal on the printed circuit board may be drawn to the periphery of the hinge module to ground.

In addition, although the folder type terminal is illustrated and described in describing the present invention, the technical idea of the present invention is applicable to other terminals, for example, a folder type, a flip-up type, a general PDA, a notebook PC, and the like.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the case where it is determined that the gist of the present invention may be unnecessarily obscured, the detailed description thereof will be omitted.

1 is a perspective view showing a configuration of a general portable wireless terminal 100, which can be opened and closed by a hinge operation of a predetermined hinge module in the main body 110 and the main body 110 composed of upper and lower casing frames. And a plurality of key buttons installed in a main body for inputting data into the LCD module 130 and an LCD module (display device) 130 installed on the sub body. One keypad unit 140 and the antenna device 150 is installed in the main body.

At this time, the periphery of the antenna device 150, that is, the parts where the main body 110 and the sub body 120 meet (the parts A and B of FIG. 1) may be the highest current density emitted from the antenna device 150. It's a lot of acceptance. In particular, the portion A of FIG. 1 that is closest to the antenna device 150 is the place where the influence of electromagnetic waves is most affected on the human body during communication due to the high current density.

Therefore, the electromagnetic wave absorptivity reduction apparatus according to the present invention should be installed in part A of FIG. 1, and preferably may be installed together in part A and B of FIG.

2 is a schematic view showing a state in which an electromagnetic wave absorptivity reduction apparatus according to the present invention is installed in a terminal, FIG. 3 is an exploded perspective view of the electromagnetic wave absorptivity reduction apparatus according to the present invention, and FIG. 4 is an electromagnetic wave absorptivity reduction apparatus according to the present invention. Is a side view showing a state installed in the terminal.

As shown in Figures 2 to 4, the electromagnetic wave absorption rate reducing apparatus according to the present invention may be installed on the opening and closing shaft to be opened and closed on the main body 110 of the terminal. The hinge module 10 is installed at the opening and closing shaft to open the sub body 120 at a predetermined angle on the main body 110. The hinge module 10 may be installed on the center hinge arm 121 of the sub-body 120, and rotates by interacting with both side hinge arms 111 of the main body, and has a predetermined preload, thereby opening the terminal. And a feeling of closure to the user.

Although not shown, the hinge module 10 includes a hinge housing, a hinge shaft 11 partially protruding from the hinge housing, a hinge cam cooperating with the hinge shaft, and a hinge spring for pressing the hinge cam in a hinge shaft direction. (Preferably, a compression type coil spring is used) has a structure in which it is stored sequentially. Since the known components may be applied, this is omitted.

Then, the hinge shaft 11 protruding out of the hinge housing is fixed on the side hinge arm 111 of the main body. In more detail, it may be fixed to the hinge pile 20. In addition, the hinge dummy 20 has a protruding piece 21 of a predetermined length extending outward. For the ground operation, all the components of the hinge module 10 and the hinge pile 20 are made of a metallic material.

On the other hand, the main body 110 may have a printed circuit board (RF board) 30, it is provided with a predetermined ground terminal (31). In the present invention, the ground terminal 31 has a shape drawn out to the side hinge arm 111 of the main body 110. However, the present invention is not limited thereto, and the flexible printed circuit (FPC) electrically connected to the ground terminal 31 of the printed circuit board 30 may be drawn out to the side hinge arm 111 of the main body 110. .

Thereafter, a predetermined connecting means for electrically connecting the protruding piece 21 of the hinge dummy 20 and the ground terminal 31 of the printed circuit board 30 is provided. As the connecting means, one end 41 is in contact with the protruding piece 21 of the hinge dummy 20 and the other end 42 is in contact with the ground terminal 31 of the printed circuit board 40. You can have The plate-type spring 40 may be fixed to the case frame of the main body 110, and stores a certain elasticity, so that the protruding pieces 21 and the printed circuit board 30 of the hinge pile 20 are always provided. It is possible to maintain a state in which the ground terminals 31 are electrically connected to each other. However, the plate spring may be formed in various shapes. As shown in FIG. 2, it may have a predetermined angle and be bent once, but may be configured without bending or bending a plurality of times in consideration of an installation space. For example, any conductive component capable of always in intimate contact between the ground terminal of the printed circuit board and the projecting piece of the hinge dummy is possible.

FIG. 5 is a side view illustrating a state in which an electromagnetic wave absorptivity reduction apparatus according to another embodiment of the present invention is installed in a terminal, and has one end 51 fixed to the protruding piece 21 'of the hinge dummy 20' and the other end 52. The ball plunger 50 may contact the ground terminal 31 of the printed circuit board 30. As is known, the ball plunger 50 has a predetermined elasticity by a predetermined spring on the lower side. Therefore, since the ground terminal 31, the hinge dummy 20, and the hinge module 10 of the printed circuit board 30 are all electrically connected to each other, the radiation performance of the terminal is improved, and electromagnetic waves It can be effectively reduced.

As described above, the electromagnetic wave absorptivity reduction apparatus according to the embodiment of the present invention not only contributes to the miniaturization and thinning of the terminal, but also has an effect that the electromagnetic wave absorptivity can be effectively reduced and its structure is simple.

Claims (4)

In a portable wireless terminal comprising a main body having a printed circuit board and a sub body installed to be opened and closed by a predetermined hinge module on the main body, And a hinge module formed of a conductive material and grounded by drawing a ground terminal on the printed circuit board to the periphery of the hinge module. The method of claim 1, The hinge module includes a metal hinge dummy fixed to the hinge shaft of the main body, and a protruding piece extending outwardly from the hinge module is grounded to the ground terminal of the printed circuit board by a predetermined connection means. Device for reducing electromagnetic wave absorption rate of a wireless terminal. The method of claim 2, One end of the connecting means is in contact with the protruding piece of the metal hinge pile, the other end is a plate-type spring bent in contact with the ground terminal of the printed circuit board, the absorption rate of the portable radio terminal. The method of claim 2, One end of the connecting means is in contact with the projecting piece of the metal hinge pile, the other end is a plunger of the electromagnetic wave absorption rate of the portable radio terminal, characterized in that the ball plunger is in contact with the ground terminal of the printed circuit board.