WO2005107015A1

WO2005107015A1 - Mobile telephone with broadcast receiver

Info

Publication number: WO2005107015A1
Application number: PCT/JP2005/004672
Authority: WO
Inventors: Yukari Yamazaki; Yutaka Saito; Yoshio Koyanagi; Kiyoshi Egawa; Hiroyuki Sasaki
Original assignee: Matsushita Electric Industrial Co., Ltd.
Priority date: 2004-04-30
Filing date: 2005-03-16
Publication date: 2005-11-10
Also published as: JP2005318407A

Abstract

A mobile telephone with broadcast receiver wherein the antenna polarization can be modified in accordance with various usage statuses and a high sensitivity can be achieved. Antenna elements (1,2) are disposed on an upper case (3) in such a manner that they are angled by 90 degrees with respect to each other. A signal received by the antenna element (1) is inputted to a power distributor (9) via a phase shifter circuit (8), while a signal received by the antenna element (2) is inputted directly to the power distributor (9). The received signal as combined in the power distributor (9) is inputted to a television receiving circuit (10). A detection output from an angle sensor (11) is inputted to a control circuit (12), which controls, in accordance with the detection result of the angle sensor (11), the phase shift amount of the phase shifter circuit (8).

Description

Specification

Mobile phone with broadcast receiver

Technical field

The present invention relates to a display unit and an antenna of a mobile phone having a broadcast receiving function.

Background art

[0002] One of the technical issues when a television receiver is mounted on a mobile phone is a method of configuring a UHF band receiving antenna having a long wavelength of about 64 cm to 44 cm. In mobile phone communications, frequencies in the 800 MHz band or higher, with a wavelength of about 37 cm or less, are used.The main polarization of radio waves is vertical polarization, whereas radio waves for television broadcasting are not. The main polarization is horizontal polarization. Therefore, a UHF band receiving antenna with a specification different from that of a mobile phone antenna is required.

[0003] As an antenna of a conventional portable television receiver, for example, as disclosed in Patent Document 1, a dipole antenna is configured by a monopole antenna and a battery, and is disposed vertically with respect to the receiver. The configuration is known.

[0004] Furthermore, as described in Patent Document 2, there is known a configuration in which two loop antennas are arranged so as to be orthogonal to each other to switch the polarization in accordance with a use state when worn on a human body. ! / Puru Patent Document 1: JP 2001-251131 A

Patent Document 2: JP-A-10-84209

Disclosure of the invention

Problems to be solved by the invention

[0005] However, the conventional antenna shown in Patent Document 1 described above has a problem that the sensitivity to the horizontally polarized radio wave cannot be increased because the main polarized wave is the vertically polarized wave. To.

[0006] Further, in the conventional antenna disclosed in Patent Document 2, it is possible to switch the main polarization direction to two different directions. The force is continuous in various usage states. There was a problem that it could not be controlled. [0007] Further, the above-described conventional antenna has a problem in that the antenna performance must be taken into consideration when securing the antenna performance in a state of being held by the user's hand.

[0008] Further, the above-described conventional antenna has a problem that the receiving sensitivity is degraded due to the influence of the transmission wave of the mobile phone.

An object of the present invention is to provide a mobile phone with a broadcast receiver that can change the polarization of an antenna according to various use conditions and has high sensitivity.

Means for solving the problem

[0010] In order to achieve the above object, a mobile phone with a broadcast receiver according to the present invention includes a housing on which a display unit is mounted, a plurality of broadcast receiving antenna elements mounted on the housing, Means for synthesizing the signals of the plurality of broadcast receiving antenna elements, detecting means for detecting an inclination angle of the housing, and signal phases of the plurality of broadcast receiving antenna elements according to a detection result of the detecting means And control means for controlling the

[0011] According to the above configuration, it is possible to control so that the polarization direction of the antenna is always set to a predetermined direction with respect to the inclination angle of the housing in various use states. , The effect can be reduced, and high reception performance can be obtained.

The invention's effect

According to the present invention, an appropriate main polarization direction of the antenna is always set even when the inclination angle of the housing changes in various use states, so that high reception performance can be obtained.

[0013] Furthermore, since the main polarization direction of the antenna can be adjusted by a user's operation in various use states, high reception performance can be ensured.

[0014] Furthermore, the electromagnetic isolation between the radio circuit of the mobile phone and the television receiver can be set high, the shielding effect can be secured, and the deterioration of the reception performance due to the influence of the transmission wave of the mobile phone can be suppressed. Reception performance is obtained.

Brief Description of Drawings

[FIG. 1] A basic configuration diagram of a mobile phone with a broadcast receiver according to Embodiment 1 (a television reception state on a landscape display screen)

[FIG. 2] Basic configuration diagram of a mobile phone with a broadcast receiver according to Embodiment 1 (television reception state on portrait display screen) [FIG. 3] A basic configuration diagram of a mobile phone with a broadcast receiver according to Embodiment 1 (standby state with the mobile phone closed)

[FIG. 4] A basic configuration diagram of a mobile phone with a broadcast receiver according to Embodiment 2 (a television reception state on a landscape display screen)

BEST MODE FOR CARRYING OUT THE INVENTION

Hereinafter, an embodiment of a mobile phone with a broadcast receiver according to the present invention will be described in detail with reference to the drawings.

(Embodiment 1)

1, 2, and 3 are basic configuration diagrams of a mobile phone with a broadcast receiver according to the first embodiment of the present invention. As shown in FIG. 1, a mobile phone with a broadcast receiver according to the present embodiment has an upper housing 3 on which antenna elements 1 and 2 are mounted, and a lower housing connected by a biaxial rotating hinge 4. It is composed of a housing 5.

FIG. 1 shows a state where the upper housing 3 is opened so as to be orthogonal to the lower housing 5 by 90 degrees. This is a state in which the user views the television image displayed on the display element 7 mounted on the upper housing 3 while holding the lower housing 5 with the hand 6. In this case, since the display element 7 has a horizontally long screen, that is, the longitudinal direction of the screen is horizontal, it is suitable for viewing, for example, ordinary television broadcast video.

FIG. 2 shows a state where the upper housing 3 and the lower housing 5 are opened in the same plane. In this case, since the display element 7 has a vertically long screen, that is, the longitudinal direction of the screen is vertical, for example, it is possible to view a screen in which additional information such as character information is displayed below or above a normal television broadcast image. Suitable for

[0020] In Fig. 1 and Fig. 2, the antenna element 1 and the antenna element 2 are in an extended state.

FIG. 3 shows a state in which the upper housing 3 and the lower housing 5 are closed, which is suitable for a standby state of a mobile phone stored in a pocket. At this time, the user can store the antenna element 1 and the antenna element 2 in the upper housing 3. In the state shown in FIG. 3, it is assumed that no television broadcast is received. In this way, when the upper case 3 and the lower case 5 of the mobile phone are closed and stored in a pocket, the antenna is Since the antenna element 1 and the antenna element 2 can be housed in the upper housing 3, the antenna element does not interfere with the housing.

Hereinafter, the operations of the antenna element 1 and the antenna element 2 will be described in detail with reference to FIG. 1 and FIG.

In FIG. 1, antenna element 1 and antenna element 2 operate as a monopole antenna for television reception. Hereinafter, the explanation will be made assuming that the frequency of the television broadcast wave is 600 MHz (wavelength is 50 cm). The total length of the antenna element 1 and the antenna element 2 is set to, for example, about 6 cm (about 0.1 wavelength). In order to resonate the antenna element 1 and the antenna element 2 at the reception frequency, it is desirable that the electric length be a quarter wavelength. Therefore, usually, a helical shape or a meander shape is formed inside the antenna element 1 and the antenna element 2. An element for shortening the wavelength is incorporated.

Here, the antenna element 1 and the antenna element 2 are attached to the end of the upper housing 3 along the longitudinal direction (direction 13) in a structure that can be expanded and contracted. The antenna element 1 is mounted so that its axial direction is inclined at about 45 degrees with respect to the longitudinal direction (direction 13) of the upper housing 3. On the other hand, the antenna element 2 is mounted so that its axial direction is inclined at about 45 degrees with respect to the longitudinal direction (direction 13) of the upper housing 3 and faces the antenna element 1. As a result, the main polarization directions of antenna element 1 and antenna element 2 are orthogonal by 90 degrees.

[0025] The signal received by antenna element 1 is input to power splitter 9 via phase shift circuit 8, and the signal received by antenna element 2 is directly input to power splitter 9. The phase shift circuit 8 is, for example, a circuit including a coil or a capacitor, which is a lumped constant circuit element, and has a function of changing the phase of a signal received by the antenna element 1.

Power divider 9 is, for example, a Wilkinson-type power divider composed of microstrip lines, and combines signals received by antenna elements 1 and 2 with the same weight (same amplitude). It has a function to do. The received signal synthesized by the power divider 9 is input to the television receiving circuit 10.

An angle sensor 11 is mounted inside the upper housing 3. The angle sensor 11 is composed of a gravity sensor or the like, and has a function of detecting an absolute inclination angle of the upper housing 3. The The detection output of the angle sensor 11 is input to the control circuit 12, and the control circuit 12 is configured to control the amount of phase change of the phase shift circuit 8 according to the detection result of the angle sensor 11.

Here, for example, as shown in FIG. 1, when the upper housing 3 is arranged with the longitudinal direction oriented in the horizontal direction, the phase change of the phase shift circuit 8 according to the output of the angle sensor 11 is performed. The volume is set to 180 degrees. In this case, antenna element 1 and antenna element 2 are combined with a phase difference (opposite phase) of 180 degrees. At this time, the main polarization direction of the antenna obtained by combining the antenna element 1 and the antenna element 2 is the direction 13, which is horizontal polarization. Generally, the main polarization direction of a television broadcast wave is horizontal. Therefore, in this state, since the polarization direction of the television broadcast wave matches the polarization direction of the antenna, high reception sensitivity performance can be obtained.

Next, as shown in FIG. 2, when the upper housing 3 is arranged with the longitudinal direction oriented vertically, the amount of phase change of the phase shift circuit 8 in accordance with the output of the angle sensor 11 Is set to 0 degrees. In this case, antenna element 1 and antenna element 2 are combined in the same phase. At this time, the main polarization direction of the antenna obtained by combining the antenna element 1 and the antenna element 2 is the direction 14. Therefore, in this state, the polarization direction of the television broadcast wave matches the polarization direction of the antenna, so that high reception sensitivity performance can be obtained.

Here, in the control circuit 12, for example, a threshold value is set in 45 ° steps for the detection result of the angle sensor 11, and the phase of the phase shift circuit 8 is set to 0 ° or By switching to 180 degrees, control can be performed such that the main polarization direction of the antenna is always set to a direction close to horizontal polarization according to the tilt angle of the upper housing 3.

[0031] Also, the antenna element 1 and the antenna element 2 are attached to the upper casing 3, and even when the antenna element is extended as shown in Figs. 1 and 2, the lower casing 5 is usually gripped. A certain distance from the user's hand 6. As a result, the influence of the hand on the antenna element can be reduced, and high reception performance can be obtained.

The built-in antenna element 15 mounted inside the lower housing 5 is, for example, a transmitting / receiving antenna for mobile phone communication operating in the 800 MHz band. The wireless circuit section 16 includes a transmitting and receiving circuit for mobile phone communication! As described above, the antenna for transmitting / receiving a mobile phone and the transmitting / receiving circuit are mounted inside the lower housing 5, and the antenna for receiving television and the receiving circuit are mounted inside the upper housing 3. I have. Therefore, the distance between the antenna for transmitting / receiving the mobile phone, the transmitting / receiving circuit, and the antenna for receiving the television and the receiving circuit can be increased, and electromagnetic isolation between the transmission wave of the mobile phone and the television receiving system can be obtained. Secured. As a result, for example, it is possible to reduce the level at which the transmission wave of the mobile phone leaks into the television receiving system, and it is possible to suppress the influence on the television reception due to the leaked signal, for example, the deterioration of the receiving performance.

[0034] Note that, as shown in the present embodiment, the antenna element 1 and the antenna element 2 have other electric lengths, such as not only a quarter wavelength but also a half wavelength. You may.

[0035] Further, the antenna element is not limited to a monopole type including a helical or meander-shaped element, but may be a dipole antenna, a microstrip line antenna, a patch antenna, a slot antenna, a loop antenna, an inverted F-type antenna, or the like. The two antenna elements can be arranged so that the polarization directions are different from each other.

[0036] Even if the number of antenna elements is three or more, any configuration may be used as long as the polarization of the entire combined antenna can be controlled.

[0037] In addition, the portion to which the antenna element is attached is not limited to the end along the longitudinal direction of the upper housing as shown in the present embodiment, but may be, for example, the end along the width of the upper housing. It is desirable to place it as far away from the user's hand as possible.

[0038] Control means for controlling the signal phase of the antenna element may be a hybrid circuit, a directional coupler, or the like. Further, two receiving circuits may be prepared, and the signals may be combined in the detection processing stage (baseband signal processing) while controlling the phase.

[0039] The structure of the antenna element is not limited to a telescopic structure, but may be a constantly protruding structure.

[0040] Further, the angle difference between the two antenna elements in the main polarization direction is not limited to 90 degrees as in the present embodiment, and if there is an angle difference of a certain angle (for example, about 30 degrees) or more, the phase shift occurs. The main polarization direction can be switched by changing the phase of the circuit.

(Embodiment 2) FIG. 4 is a basic configuration diagram of a mobile phone with a broadcast receiver according to a second embodiment of the present invention. As shown in FIG. 4, the mobile phone with a broadcast receiver according to the present embodiment is provided with a control button 17, and when the user presses the control button 17 with the thumb 18, the main polarization direction of the antenna is changed. Can be controlled.

In FIG. 4, the output of the control button 17 is input to the control circuit 20 via the control signal 19. The control circuit 20 operates to control the amount of phase change of the phase shift circuit 8 every time the control button 17 is pressed.

For example, when the phase change amount of the phase shift circuit 8 is currently 180 degrees, when the control button 17 is pressed once, the operation is performed so as to switch to the phase change amount. Further, when the control button 17 is pressed again, the phase change amount is set to 180 degrees.

With this configuration, when the user presses the control button 17, the main polarization direction of the antenna can be changed one after another from horizontal to vertical and from vertical to horizontal.

[0045] In general, horizontal polarized waves are mainly used for television broadcast radio waves. However, vertical polarization may be used in some areas. Also, in an urban area or the like, a multipath (multiple wave) propagation environment is created by waves reflected from a feature such as a building. Due to this multiple reflection, even if the radio wave to be broadcast is horizontal polarization, the polarization at the position where the user receives the signal contains many components other than horizontal polarization such as vertical polarization components.

Therefore, as shown in FIG. 4, if the user can change the main polarization direction of the antenna while watching the television image displayed on display element 7, it is possible to always adjust to the good reception state. it can.

As described above, according to the present embodiment, high reception performance can always be obtained by operating the control button without the user adjusting the direction of the antenna or the direction of the mobile phone.

[0048] Also, in Fig. 1 and Fig. 2, regardless of the main polarization component determined by the radio wave propagation environment, the user can always obtain high reception performance by operating the control button.

[0049] Further, in Figs. 1 and 2, regardless of whether the screen with the mobile phone opened is landscape, portrait, or any other state, the user can use the control button. By performing the above operation, high reception performance can always be obtained. Further, in FIGS. 1 and 2, regardless of the inclination of the mobile phone, the user can always obtain high reception performance by operating the control button regardless of the inclination of the mobile phone.

[0051] The phase change amount is not limited to 0 degree and 180 degrees. For example, if the phase change amount is controlled to 90 degrees or 270 degrees, in addition to horizontal polarization and vertical polarization, circular polarization characteristics can be obtained. And left-handed and right-handed polarized waves can be obtained.

If the phase change amount is configured to change continuously, elliptical polarization characteristics can be obtained in addition to horizontal polarization, vertical polarization, and circular polarization.

The directivity can be changed by controlling the amount of phase change.

In the first and second embodiments, the broadcast receiving system is described as a television. However, it goes without saying that similar effects can be obtained with other broadcasting systems such as text information and FM band broadcasting. No.

Further, in the first and second embodiments, the mobile phone in which the upper housing 3 and the lower housing 5 are rotated in two axial directions by the two-axis rotating hinge 4 has been described as an example. However, the present invention is not limited to this, and a so-called revolver type mobile phone in which the upper housing 3 and the lower housing 5 are attached via a rotating shaft and rotated, or the upper housing 3 and the lower housing 5 are bent by a hinge portion. So-called foldable mobile phones, and even mobile phones with broadcast receivers, even if they are straight type mobile phones with no hinges or rotating shafts and the upper housing 3 and the lower housing 5 are integrated. Of course.

Further, the mobile phone with a broadcast receiver of the present invention may have a data communication function in addition to a telephone (voice call) function and a broadcast receiver function. It also includes a data communication device with a broadcast receiver that has no data communication function but a data communication function.

[0057] In a first aspect of the present invention, a housing on which a display unit is mounted, a plurality of broadcast receiving antenna elements mounted on the housing, and a signal of the plurality of broadcast receiving antenna elements are combined. Means for detecting a tilt angle of the housing, and control means for controlling signal phases of the plurality of antenna elements for broadcast reception in accordance with a detection result of the detection means. Mobile phone.

[0058] According to the above configuration, the antenna tilts with respect to the inclination angle of the housing in various use states. It is possible to control the polarization direction to be always set to a predetermined direction, reduce the influence of the user's hand, and obtain high reception performance.

[0059] In a second aspect of the present invention, a housing on which a display unit is mounted, a plurality of broadcast receiving antenna elements mounted on the housing, and a signal of the plurality of broadcast receiving antenna elements are combined. And a control means for controlling the signal phases of the plurality of antenna elements for broadcast reception by a user's operation.

[0060] According to this configuration, it is possible for the user to control the main polarization direction of the antenna to be changed, and the influence of the user's hand can be reduced, so that high reception performance can always be obtained.

[0061] In a third aspect of the present invention, in the above configuration, the housing is held by a first housing on which the display unit and the plurality of broadcast receiving antenna elements are mounted, and held by a user's hand. A first housing and a second housing, wherein the first housing and the second housing are rotatably connected by connecting means.

[0062] According to this configuration, it is possible to perform control so that the main polarization direction of the antenna is changed even when the first housing on which the display unit and the plurality of broadcast receiving antenna elements are mounted is rotated. In addition, the influence of the user's hand can be reduced, and high reception performance can always be obtained.

[0063] In a fourth aspect of the present invention, in the above-described configuration, further, a broadcast receiving circuit mounted in the first housing, and a mobile phone communication antenna element mounted in the second housing, This is a mobile phone with a broadcast receiver including the mobile phone transmitting / receiving circuit mounted inside the second housing.

[0064] According to this configuration, the electromagnetic isolation between the radio circuit and antenna of the mobile phone and the television receiver can be set high, the shielding effect can be ensured, and the reception performance degradation due to the influence of the transmission wave of the mobile phone. , And high reception performance can be obtained.

[0065] The present specification is based on Japanese Patent Application No. 2004-135992 filed on April 30, 2004. All of this content is included here.

Industrial applicability

As described above, in the mobile phone with a broadcast receiver according to the present invention, an appropriate main polarization direction of the antenna is always set even when the inclination angle of the housing changes in various use states. Ruta Therefore, high reception performance can be obtained. Further, in various usage states, the main polarization direction of the antenna can be adjusted by a user operation, so that high reception performance can be secured. In addition, the electromagnetic isolation between the wireless circuit of the mobile phone and the television receiver can be set high, so that the shielding effect is ensured and the deterioration of the reception performance due to the influence of the transmission wave of the mobile phone can be suppressed. Is obtained. Due to such effects, the present invention is useful for improving reception and communication performance of a mobile phone with a broadcast receiver.

Claims

The scope of the claims

[1] a housing on which the display unit is mounted,

A plurality of broadcast receiving antenna elements mounted on the housing,

Means for combining signals of the plurality of broadcast receiving antenna elements,

Detecting means for detecting an inclination angle of the housing;

Control means for controlling a signal phase of the plurality of broadcast receiving antenna elements according to a detection result of the detection means;

Mobile phone with a broadcast receiver.

[2] a housing on which the display unit is mounted,

A plurality of broadcast receiving antenna elements mounted on the housing,

Control means for controlling a signal phase of the plurality of broadcast receiving antenna elements by a user operation,

Mobile phone with a broadcast receiver.

[3] The housing,

A first housing on which the display unit and the plurality of broadcast receiving antenna elements are mounted, and a second housing held by a user's hand,

The mobile phone with a broadcast receiver according to claim 1, wherein the first housing and the second housing are rotatably connected by connecting means.

[4] Furthermore,

A broadcast receiving circuit mounted inside the first housing,

An antenna element for mobile phone communication mounted on the second housing;

A mobile phone transmitting / receiving circuit mounted inside the second housing;

The mobile phone with a broadcast receiver according to claim 3, comprising: