KR20030008682A - Folder type hand mobile telephone having lowered hinge shaft - Google Patents

Abstract

PURPOSE: A folder-type cellular phone having a downward hinge axis is provided to minimize the harmful influence by an electromagnetic wave operated in a human body during a cellular phone call and the degradation of an antenna efficiency by the electromagnetic wave absorption of a head by forming a hinge axis of a body and a cover at a front surface portion of the body separated from an upper surface of the body by a certain interval. CONSTITUTION: A telephone transmitter is composed in one side of a body case(210). A cover(220) is combined at one side of the body case(210) by hinge, and a display window is composed in the cover(220). A transmitting and receiving antenna(230) is installed on an upper end of the body case(210) for transmitting and receiving an RF(Radio Frequency) communication signal. A hinge axis(B1) is installed to be separated from the upper end of the body case(210) by a certain distance for separately combining the cover(220) from the upper end of the body case(210) by the certain distance.

Description

Clamshell mobile phone with downward hinge axis {FOLDER TYPE HAND MOBILE TELEPHONE HAVING LOWERED HINGE SHAFT}

The present invention relates to a clamshell mobile phone, and more particularly, a hinge coupling part between a cover provided with a receiver and a main body provided with a talker is positioned to be spaced apart from the top of the main body by a predetermined distance to minimize human body absorption of electromagnetic waves due to an antenna. In addition, the present invention relates to a folding mobile phone having a downward hinge axis that improves antenna efficiency.

With the development of the information and telecommunications industry, various personal mobile communication devices have been widely used and used. Among them, mobile phones have a high number of conveniences for use, and are comparable to landline phones. In response to this, mobile phone manufacturing technology is also rapidly developing. The main technical fields are mainly semiconductor, battery, and antenna manufacturing technologies. Among them, antenna manufacturing technology has the basic purpose of increasing antenna efficiency and the recently absorbed electromagnetic wave absorption rate. Reduction is the biggest challenge.

Conventional mobile phone antennas include monopole antennas, whip antennas, helical antennas, sleeve antennas, inverted-F antennas, flat inverted-F antennas, diversity antennas, microstrip antennas, chip antennas, twisted loop antennas. Various antennas have been developed, such as EID antennas and N-type antennas. Among the mobile phone antennas, the whip antenna, the helical antenna, the sleeve antenna, the N-type antenna, the chip antenna, and the FS-PIFA are classified into external antennas installed outside the mobile phone, and the inverted F antenna, the flat inverted F antenna, Diversity antennas, microstrip antennas, twisted loop antennas, and EID antennas are classified into built-in antennas installed inside the mobile phone.

Meanwhile, mobile phone antennas are classified into monopole type antennas and flat type antennas according to the method of excitation of radiated electromagnetic waves. Monopole type antennas are generally external antennas such as whip antennas, helical antennas, sleeve antennas, chip antennas, and N-type antennas. The flat type antenna includes an inverted type F antenna, a flat type F antenna, a diversity antenna, a micro strip antenna, an antenna having a plate structure such as an EID antenna, an FS-PIFA, an RCDLA, a DTSA antenna, and the like.

By the way, the monopole type antenna has the advantage of having a universal broadband, but can not suppress the effect of electromagnetic waves, the flat type antenna has excellent characteristics in terms of suppressing the influence of electromagnetic waves, There was a problem not having. In addition, the non-rectractable antenna used in recent years has a structure in which a short-length helical antenna is installed and stored alone, which increases the radio wave absorption rate of the head due to the exposure of the feeder. There is a problem that the antenna gain is reduced.

On the other hand, while the monopole antenna is an external type, the recently developed semi-exposure fixed monopole antenna, a built-in monopole antenna using a radio wave absorber, and a clamshell terminal monopole antenna for SAR reduction have a built-in structure. At the same time it has a low SAR (Specific Absorption Rate) value. Among these, the semi-exposure fixed monopole antenna has excellent antenna efficiency, but the SAR reduction effect is lower than that of the built-in monopole antenna utilizing the radio absorber. The built-in monopole antenna utilizing the radio absorber has excellent SAR reduction effect, but the antenna efficiency is semi-exposure fixed type. It is inferior to the monopole antenna.

In addition, the semi-exposure fixed monopole antenna is difficult to match impedance due to an increase in coupling between the antenna element and the cell phone cover, as in the case of the general whip antenna, and the radiation efficiency is reduced due to the proximity of the antenna element and the head. Since it is required to secure a predetermined ground area, it is difficult to reduce the thickness of the mobile phone.

In addition, the above-described SAR-type folding terminal monopole antenna has been developed to solve this problem, and exhibits excellent characteristics for both antenna efficiency and SAR reduction effect. However, in the case of the SAR type folding terminal monopole antenna, the radio wave absorber is positioned adjacent to the hinge coupling portion of both sides of the terminal which is folded, so that SAR increases due to leakage of electromagnetic waves through the fold. There is this.

1A to 1C are a perspective view and a side view showing a conventional foldable cellular phone equipped with a monopole type antenna among the various kinds of antennas as described above.

Conventional clamshell mobile phones, as shown in Figures 1a to 1c, the main body 110 is provided with a plurality of input buttons 111 and the transmitter 112 in a predetermined position; A lid 120 hinged to an upper end side of the main body 110 and having a liquid crystal display 121 and a hydration unit 122; It consists of an antenna 130 mounted on the other side of the upper end of the main body 110.

In the case of the conventional clamshell mobile phone, the hinge shaft A1 to which the main body 110 and the cover 120 are coupled is adjacent to the antenna on the upper surface of the main body 110 for widening the cover 120 or for manufacturing convenience. It is made of a structure formed in a predetermined position. As a result, electromagnetic waves excited at the power supply unit of the antenna 130 leak through the gap between the main body 110 and the cover 120 of the hinge shaft A1, thereby increasing the SAR value. Furthermore, in the case of the monopole type antenna, a ground plane orthogonal to the antenna element should be provided on the inner upper end of the main body 110. Since the hinge shaft A1 occupies a part of the upper surface of the main body 110, sufficient antenna ground area is provided. It is difficult to secure and there are limitations in making the phone thin. In addition, since the cover 120 is mounted close to the antenna element, there is a problem in that the coupling amount is increased, thereby reducing the efficiency of the antenna due to impedance mismatch. When the antenna 130 is provided with an antenna less than a quarter wavelength, such as a semi-exposure fixed monopole antenna or a helical antenna, the antenna efficiency decreases due to the increase in the coupling amount.

On the other hand, the same structure as the conventional clamshell mobile phone, but when deployed, SAR-type clamshell mobile phone has been developed with an electromagnetic wave reflector attached to the inner surface or the outer surface of the cover 120 facing the antenna 130. In this case, the antenna 130 may be a variety of antennas such as helical antenna, whips antenna, semi-exposure fixed monopole antenna, and when the semi-exposure fixed monopole antenna is mounted, it is easy to secure the antenna ground plane by the reflector. However, when it is necessary to secure the antenna ground plane on the upper surface of the main body 110, such as a whip antenna and a helical antenna, the problem that the ground plane itself becomes narrow as described above is still inevitable.

Accordingly, the present invention has been made in order to solve the above problems, by the hinge shaft of the main body and the cover to be hinged is formed in the front portion of the main body spaced apart from the upper surface of the main body on which the antenna is mounted by a predetermined interval, It is an object of the present invention to provide a folding cellular phone having a downward hinge axis to minimize the deterioration of antenna efficiency caused by the electromagnetic wave acting on the human body during the mobile phone call and the absorption of electromagnetic waves of the head.

In addition, the present invention to secure a wide ground plane when the monopole antenna is mounted to enable the manufacture of a thin clamshell mobile phone, and to increase the antenna efficiency by reducing the coupling amount of the monopole antenna element and the cover of the clamshell mobile phone. Another object is to provide a clamshell cell phone with a downward hinged axis that allows it.

1A to 1C are a perspective view and a side view of a conventional folding cellular phone.

Figures 2a to 2c is a perspective view and a side view showing an embodiment configuration of a folding cellular phone having a downward hinge axis according to the present invention.

Figures 3a to 3d are perspective and cross-sectional views showing another embodiment configuration of a folding cellular phone having a downward hinge axis according to the present invention.

Figures 4a and 4b is a perspective view showing another embodiment configuration of a folding cellular phone having a downward hinge axis according to the present invention.

5 is a perspective view showing another embodiment configuration of a folding cellular phone having a downward hinge axis according to the present invention.

* Explanation of symbols for main parts of the drawings

210: main body 211: input button

212: transmitter 220: cover

221: LCD screen 222: Receiver

230: antenna

In order to achieve the above object, the present invention, the main body case provided with a sending unit on one side; A hinge coupled to one side of the main body case and provided with a display window; A transmission / reception means mounted on an upper end of the main body case for transmitting and receiving a wireless communication signal; And a coupling means installed to be spaced apart from the top of the main body case by a predetermined distance and hingedly coupled to the cover to be spaced apart from the top of the main body by a predetermined distance.

In the folding cellular phone having the downward hinge axis of the present invention, the hinge coupling portion coupled to the main body case and the cover is formed at a position lowered by a predetermined distance from the upper end of the main body case on which the transmission / reception means is mounted. There is an advantage that can reduce the impact, and improve the antenna efficiency.

The above objects, features and advantages will become more apparent from the following detailed description taken in conjunction with the accompanying drawings. Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

Figures 2a and 2b is a perspective view showing an embodiment configuration of a folding cell phone having a downward hinge axis according to the present invention, Figure 2c is a side view thereof.

The folding mobile phone having the downward hinge axis of the present invention includes a main body case 210 having a plurality of input buttons 211 and a transmitter 212 at a predetermined position, as shown in FIGS. A lid 220 hinged to a position downward from an upper end of the main body case 210 by a predetermined interval, and having a liquid crystal display 221 and a receiving part 222; It consists of an antenna 230 mounted on the upper surface of the main body case 210.

Looking at the detailed function and operation of each component as follows.

In the folding-type mobile phone having the downward hinge axis of the present invention configured as described above, the hinge shaft B1 to which the main body case 210 and the cover 220 are coupled is provided with the main body case 210 to which the antenna 230 is mounted. Since it is formed at a position downward from the top by a predetermined interval, in a state in which the mobile phone is unfolded, such as during a call, electromagnetic waves leaked through the connection between the main body case 210 and the cover 220 are minimized, and the upper surface of the main body case 210. This allows more space for installing antenna ground plates in the system.

In addition, as the upper surface of the main body case 210 is widened, and the cover 220 is relatively farther away from the antenna 230, the amount of electrical coupling between the cover 220 and the antenna 230 is reduced, thereby reducing the antenna. Even if 230 moves to the center of the upper surface of the main body case 210, the impedance matching is less affected, and thus the choice of the installation position of the antenna is widened. In addition, since the SAR of the head is reduced as the antenna 230 is located at the center of the upper surface of the main body case 210, the above characteristics are very important.

Table 1 shows the experimental results of measuring the SAR reduction effect by the mobile phone having the downward hinge axis of the present invention as described above.

division L = 0 cm L = 0.3 cm L = 0.9 cm 1 g peak SAR value 1.32 W / Kg 1.21 W / Kg 1.18 W / Kg 10 g peak SAR value 0.79 W / Kg 0.67 W / Kg 0.59 W / Kg Radiation efficiency 49% 50% 59%

The results in Table 1 are based on a clamshell mobile phone with a lid size of 5cm × 7.5cm × 1.8cm and a body of 5cm × 9cm × 1.8cm. In Table 1, L is the body and the cover from the top of the body. The distance to the hinge axis of. In addition, the measurement was performed with the cover unfolded to form a 30 ° angle with the antenna. As shown in Table 1, it can be seen that the longer the distance from the upper end surface of the main body to the hinge axis of the main body and the cover, the SAR value decreases and the radiation efficiency increases.

3A and 3B are perspective views showing another embodiment configuration of a folding cellular phone having a downward hinge axis according to the present invention, and FIGS. 3C and 3D are side cross-sectional and front cross-sectional views, in which the reflecting plate is provided in this embodiment. An example is applied to a SAR reduced clamshell cell phone.

In the folding mobile phone having the downward hinge axis of the present embodiment, as shown in FIGS. 3A to 3D, the lid 320 is hinged at a position downward from the top of the main body 310 by a predetermined distance, as in the above-described embodiment. The antenna 330 is mounted on an upper surface of the main body 310, but an electromagnetic wave reflecting plate 340 is provided on an outer surface of the cover 320 facing the antenna 330.

Here, the antenna 330 may be made of various types such as a helical antenna, a whip antenna, and a semi-exposure fixed monopole antenna.

In the case of the clamshell cellular phone having the downward hinge axis of the present embodiment configured as described above, the shielding effect of the electromagnetic wave excited from the antenna feeding part among the electromagnetic wave components significantly affecting the SAR value of the human head may be improved. .

4A and 4B illustrate an example in which the main body 410 and the cover 420 are configured in the same manner as the above-described embodiment, but the antenna 430 is mounted at the center of the upper surface of the main body 410. That is, the amount of electrical coupling between the cover 420 and the antenna 430 is reduced by the connection structure of the main body 410 and the cover 420 so that the antenna 430 is mounted at the center of the upper surface of the main body 410. In this embodiment, the antenna 430 is mounted at the center of the upper surface of the main body 410 so as to reduce the SAR of the head and increase the electromagnetic shielding efficiency of the electromagnetic wave reflecting plate 440. will be.

In addition, Figure 5 shows an example to ensure a large ground area in a mobile phone equipped with a wide monopole antenna, as the cover 520 is hinged to a position spaced a predetermined distance from the top of the main body 510 , Protrudes forward of the upper end of the body 510 to attach the wide ground plate 540. That is, in the case of a monopole antenna, the ground plate 540 generates charges having opposite phases due to an image effect, thereby generating radiated electromagnetic waves. If the area of the ground plate 540 is not sufficiently secured, the external environment, that is, Because of the change in radiation characteristics caused by conductive objects located around the mobile phone, such as the position of the hand or the head, a sufficient ground area must be secured for stable communication. This purpose can be achieved by having a larger cross-sectional area of the upper end of the main body 510 as described above.

The present invention described above is not limited to the above-described embodiments and the accompanying drawings, and various substitutions, modifications, and changes are possible in the art without departing from the technical spirit of the present invention. It will be apparent to those of ordinary knowledge.

According to the present invention as described above, as the cover of the clamshell mobile phone is hinged to a position downward from the top of the main body by a predetermined distance, the leakage of electromagnetic waves through the gap between the coupling portion of the main body and the cover is prevented, The coupling amount of the antenna is reduced, and the separation distance between the antenna element and the head of the user is increased, thereby increasing the antenna radiation efficiency.

In addition, according to the present invention, it is possible to secure a large ground area on the upper surface of the mobile phone main body and to reduce the thickness of the mobile phone, the influence of the antenna impedance by the cover is significantly reduced, irrespective of whether the mobile phone is in use or not in use. Impedance matching is advantageously maintained.

Claims (5)

A main body case provided with a talker on one side; A hinge coupled to one side of the main body case and provided with a display window; A transmission / reception means mounted on an upper end of the main body case for transmitting and receiving a wireless communication signal; And Coupling means installed to be spaced apart from the top of the main body case by a predetermined distance to hinge the cover is spaced apart from the top of the main body by a predetermined distance A clamshell phone having a downward hinge axis including a. The method of claim 1, The foldable cellular phone having a downward hinge axis, wherein the transmitting and receiving means is any one of a monopole antenna, a helical antenna, a whip antenna, a semi-exposure fixed monopole antenna, and a clamshell terminal monopole antenna for SAR reduction. The method of claim 1, An antenna ground plate connected to the hinge coupling part side upper end of the main body case perpendicular to the transmission and reception means is built in, and has a downward hinge axis in which the upper end of the main body case is thicker than the lower thickness thereof. The method of claim 1, A clamshell mobile phone having a downward hinge axis in which the transmitting and receiving means is disposed at the center of the upper end of the hinge coupler side of the main body case. The method according to any one of claims 1 to 4, A folding mobile phone having a downward hinge axis further comprising an electromagnetic wave reflecting plate provided on one side of the cover facing the transmitting and receiving means.