JP2007074491A - Portable terminal - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a portable terminal by which successful receiving quality is secured at various use states and which has a built-in antenna which can be miniaturized. <P>SOLUTION: In a collapsible cellular phone on which a first antenna 41 for receiving television broadcast and a second antenna with priority for communication are loaded together and which has a built-in TV function to which an external antenna 43 for receiving television broadcast is connected, the television broadcast is received by selecting either of the first antenna 41 or the second antenna 42 or simultaneously using them at a state that the external antenna 43 is not electrically connected. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a mobile terminal device such as a mobile phone with a broadcast receiving function equipped with an antenna for receiving broadcasts.

  In recent years, mobile phones equipped with, for example, analog television broadcast tuners have been released. Furthermore, 1-segment terrestrial digital television broadcasting for mobile bodies (mobile terminal devices) is scheduled to start. For this reason, a mobile phone equipped with a large display device with a clear image quality and a strong force is demanded from the market. On the other hand, a mobile phone having a compact shape is also demanded from the market.

  Thus, by adding a reception function for television broadcasting (hereinafter abbreviated as “television broadcasting”) to the mobile phone, an antenna for receiving television broadcasting is newly required. As a television broadcast receiving antenna mounted on a conventional mobile phone with a television broadcast receiving function (hereinafter abbreviated as “TV function”), for example, as shown in FIG. In a foldable mobile phone connected by a connecting portion 103 having a shaft rotation structure, a contraction type whip antenna 104 and an earphone cable antenna 105 which is an external antenna are used in combination. In particular, the UHF band is a whip antenna 104 and the VHF band is an earphone antenna. Those using 105 are known.

In addition, as a portable terminal device that can be equipped with a large display device and has a compact shape with excellent portability, the upper housing can move (or swivel) in parallel with the lower housing. A slidable (or swivel) mobile phone and a foldable mobile phone in which an upper housing and a lower housing are connected to each other by a hinge part are becoming mainstream.
For example, as described in Patent Document 1, as a slide-type mobile phone, an antenna and a high-frequency component are arranged in an upper casing, and main parts such as a power source and a key are arranged in a lower casing. And the lower housing are known to be slidable (turnable) in the parallel direction.

Moreover, as an antenna of a slide-type mobile phone, for example, as described in Patent Document 2, by disposing the antenna in the lower housing, the protruding portion of the upper housing can be eliminated and the upper housing can be made thin. Is known. In the case of such an antenna, when viewing a television broadcast, it is necessary for the user to extend the antenna if it is a whip antenna, and to connect an earphone if it is an earphone antenna.
JP-A-11-331332 JP 2003-298695 A

  However, in the slide type mobile phone as described above, when the whip antenna is housed in the housing, the gain of the antenna is significantly reduced and the antenna does not function. Furthermore, there is a problem that when the earphone is not connected to the earphone antenna that is an external antenna, the television broadcast cannot be received. Note that the earphone antenna may not function in the same manner even when it is wound around, for example, a mobile phone for storage.

  The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a mobile terminal device having a built-in antenna that can ensure good broadcast reception quality in various usage states and can be miniaturized. .

  The mobile terminal device of the present invention includes a first antenna for broadcast reception, a second antenna configured to be able to receive and transmit / receive broadcasts, and an external antenna for broadcast reception. In the state where the external antenna is not electrically connected, the broadcast reception is performed by selecting or simultaneously using one of the first antenna and the second antenna. With the above configuration, for example, an antenna necessary for receiving a broadcast such as a television broadcast can be secured, and a good reception characteristic can be obtained.

  In addition, the second antenna includes the power supply means for receiving the broadcast together with the power supply means for communication. With the above-described configuration, it is possible to share an antenna for communication and broadcast reception, and it is possible to secure another antenna necessary for broadcast reception such as television broadcast and to obtain good broadcast reception characteristics.

  Further, when performing the communication, if the communication state is worse than the preset state, the second antenna is used for the communication, and if the communication state is better than the preset state, Selection means for using the second antenna for the broadcast reception is provided. With the above configuration, it is possible to share antennas for communication and reception of broadcasts such as TV broadcasts. If the communication state is better than the preset state, additional antennas necessary for the broadcast reception function are secured. And good reception characteristics can be obtained.

  The first housing and the second housing have a foldable structure including a foldable connection unit that connects the first and second housings so that the first and second housings can be folded. When folded, the second antenna constitutes a loop antenna. With the above configuration, good broadcast reception quality can be ensured in various usage conditions, and the size can be reduced.

  ADVANTAGE OF THE INVENTION According to this invention, while being able to ensure favorable receiving quality in various use conditions, the portable terminal device provided with the internal antenna which can be reduced in size can be provided.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.
[First Embodiment]
1 to 4 show a foldable mobile phone with a built-in TV function according to a first embodiment of the present invention. The mobile phone has a housing portion having a first housing (hereinafter, referred to as a first housing). Two axes that connect the upper casing 1 and the lower casing 2 so as to be openable and closable and turnable. The upper casing 1 and the second casing 2 (hereinafter referred to as the “lower casing”) 2 It has the connection part 3 of a structure. In addition, the mobile phone includes a first antenna 41 to a fourth antenna 44, a first power feeding unit 51 to a fifth power feeding unit 55, a first selection switch 61 and a second selection switch 62, and a mobile phone unit 7. , A filter 8 and a television receiver 9.

  Among these, in addition to the first short electrode 11 shown in FIG. 3 and the liquid crystal display unit 12 shown in FIG. 4, the upper housing 1 includes a part of the second antenna 42, the fourth antenna 44, 5 A power feeding unit 55 and a mobile phone unit 7 are provided. The first short electrode 11 is in contact with a second short electrode 21 to be described later when the first housing 1 and the second housing 2 are closed, and thereby a part of the second antenna 42 described above. A part of the second antenna 42 described later is electrically connected.

  On the other hand, in the lower housing 2, in addition to the second short electrode 21 shown in FIG. 3 and the operation unit 22 shown in FIG. 4, a first antenna 41, a part of the second antenna 42, and a third The antenna 43, the first power feeding unit 51 to the fourth power feeding unit 54, the filter 8, and the television receiving unit 9 are provided. Note that the second short electrode 21 is electrically connected to the first short electrode 11 when the first housing 1 and the second housing 2 are closed, so that one of the second antennas 42 in the upper housing 1 is provided. And a part of the second antenna 42 in the lower housing 2 are electrically connected.

Next, details of each component will be described with reference to FIGS. 1 to 3.
As shown in FIG. 2, the first antenna 41 is a telescopic whip antenna housed in the lower housing 2, and is connected to the television receiver 9 via the first power feeder 51, the first selection switch 61, and the filter 8. And is used as an antenna for TV broadcast reception (dedicated).

  The second antenna 42 is a communication-priority antenna, and includes two conductors housed in each of the upper housing 1 and the lower housing 2, and the first housing 1 and the second housing 2 are opened. In the “open state”, an electric field antenna such as a dipole antenna or a monopole antenna is configured. On the other hand, in the case of the “closed state” in which the first casing 1 and the second casing 2 are closed and the “viewer state” in which the liquid crystal display unit 12 is displayed facing outside, the first and second The short electrodes 11 and 21 operate as a magnetic field antenna such as a loop antenna. In other words, in the case of the present embodiment, the second antenna 42 is connected to the television receiver 9 via the second power feeding unit 52, the first selection switch 61, and the filter 8 as shown in FIG. It can be used as a mobile phone antenna by connecting to the mobile phone unit 7 via the third power feeding unit 53 and the second selection switch 62. As a built-in dipole antenna used in this cellular phone, the antenna element in the upper casing 1 is disposed along the surface inside the casing, and the antenna element in the lower casing 2 is used as a ground pattern on the circuit board. You may comprise.

  The third antenna 43 is an earphone antenna that is connected via the external antenna terminal 61A. In the present embodiment, the third antenna 43 is connected to the television receiver 9 via the fourth power feeder 54, the first selection switch 61, and the filter 8. Connected and used as a TV broadcast receiving (dedicated) antenna.

  The fourth antenna 44 is an antenna provided other than the second antenna 42 for mobile phone communication (dedicated). In this embodiment, for example, an inverted F antenna is used as a built-in antenna generally used in a mobile phone. The mobile phone unit 7 is connected to the mobile phone unit 7 via the fifth power supply unit 55 and the second selection switch 62.

  The first power supply unit 51 is a power supply unit for the first antenna 41, the second power supply unit 52 is a power supply unit for the mobile phone of the second antenna 42, and the third power supply unit 53 is a power supply unit for receiving the TV broadcast of the second antenna 42. The fourth feeding unit 54 is a feeding unit for the third antenna 43, and the fifth feeding unit 55 is a feeding unit for the fourth antenna 44. The fourth feeding unit 54 performs impedance matching of a high-frequency circuit (not shown) connected to each antenna.

  The first selection switch 61 switches to a signal of an operable antenna from the first antenna 41, the second antenna 42, and the third antenna 43 and outputs the signal to the television receiver 9. The second selection switch 62 switches the signals of the second antenna 42 and the fourth antenna 44 and outputs them to the mobile phone unit 7.

Next, the relationship between the usage pattern of the mobile phone according to the present embodiment and the antenna will be described with reference to FIGS. Here, a mobile phone with a built-in TV function, in which the reception function is 1-segment digital terrestrial television broadcasting (hereinafter referred to as 1 segment DTV) and the communication function is W-CDMA, will be described as an example.
In the present embodiment, the upper housing 1 and the lower housing 2 are connected by a connecting portion 3 having a biaxial hinge structure, and the lower housing 2 is closed, opened, and rotated (turned) by the connecting portion 3. A foldable mobile phone with a built-in TV function will be described as an example.

The cellular phone according to the present embodiment includes an “open state” in which the upper housing 1 and the lower housing 2 shown in FIG. 4A are opened, and an upper housing 1 and a lower housing 2 shown in FIG. Typical three states are a closed “closed state” and a “viewer state” in which the upper casing 1 shown in FIG.
(I) In the open state as shown in FIG. 4A, the antenna antenna built in the upper housing 1 and the lower housing 2 makes the second antenna 42 a dipole antenna,
(II) In the closed state or the viewer state as shown in FIG. 4B, the short electrodes 11 and 21 are arranged at the upper part of the upper casing 1 and the lower part of the lower casing 2, and the upper casing 1 and the lower casing 2 are arranged. The antenna conductor built in the body 2 is short-circuited by the latch-like electrode. At this time, the short electrodes 11 and 21 and the antenna 42 are capacitively coupled. Therefore, the open state, the closed state, and the viewer state can be detected by electrically detecting the latched state with the short electrodes 11 and 21.

The whip antenna as the first antenna 41 exhibits a good gain when it is extended, but when it is housed in the lower housing 2, it cannot be expected to have an effect as an antenna.
Since the second antenna 42 is shared with mobile phone communication when the upper housing 1 and the lower housing 2 are opened, the second antenna 42 may not be used as an antenna for receiving television broadcasts during the communication. On the other hand, the fourth antenna 44 is used for mobile phone communication in the closed state, and the second antenna 42 operates as a loop antenna for receiving television broadcasts.
The third antenna 43 is a detachable earphone antenna that is connected to the outside and constitutes an external antenna. When the third antenna 43 is removed from the external antenna terminal 61A of the mobile phone, the antenna (for TV broadcast reception) is used. There is no function.

  Here, the combination of each usage pattern and the antenna to be used is shown in FIG. In the combination of the table shown in FIG. 5, one or more selectable antennas always exist in all states. A stable reception can be performed by selecting an antenna most suitable for reception among these antennas.

Next, means for selecting an antenna according to the present embodiment will be described.
In 1seg DTV, it is a continuous signal by OFDM (Orthogonal Frequency Division Multiplexing) modulation, and if the antenna is physically switched at an arbitrary timing during reception, the continuity of the received signal cannot be guaranteed, and the image quality It is likely to cause a decline.

Therefore, in this embodiment, as shown in FIG. 4, prioritization of television broadcast receiving antennas is performed for the use states such as open, closed, and viewer, and satisfactory reception is realized by switching the antennas. It can be done.
That is, the priority order of use in the open state is
Whip antenna> Earphone antenna> Communication priority antenna
... (1)
The antenna usable state can be discriminated by the electrical or mechanical whip antenna extension detection function and the earphone antenna connection detection function. Therefore, in this configuration order, the communication priority antenna is used as the dipole antenna for the mobile phone antenna only when the whip antenna is stored and the earphone antenna is not connected.

On the other hand, the priority use order of the TV broadcast receiving antenna in the closed state and the viewer state,
Whip antenna> Loop antenna (2)
If the whip antenna is stored, the loop antenna is used.

  For example, in the table shown in FIG. 5, in the case of the configuration 4) (open state), the W-CDMA received signal strength at the second antenna 42 when W-CDMA performs communication operation and TV broadcast reception is performed. Is higher than a preset strength, for example, when there are two or more antenna bars indicating received signal strength, the fourth antenna 44 is used for W-CDMA communication. However, when the second antenna 42 to be assigned is necessary for W-CDMA communication, that is, when the number of antenna bars indicating the received signal strength is one or less (when the received signal strength is weak), A message prompting the user to extend the whip antenna (first antenna 41) or connect the earphone antenna (third antenna 43) is displayed on the liquid crystal display unit 12, and the second antenna 42 is preferentially used for communication. To do. At this time, since the W-CDMA signal interferes with the TV receiver, there is a possibility that sufficient sensitivity cannot be secured. Therefore, the TV receiver is provided with a filter 8 for removing the W-CDMA signal, and the sensitivity decreases. Can be relaxed.

  In the present embodiment, even if the mobile phone is in an open state, a closed state, or a viewer state, the above-described configuration can be used even when the earphone antenna is not attached or the whip antenna is stored. Since it is possible to adopt a configuration in which one or more antennas always function, reliable and stable reception can be realized at any time.

[Second Embodiment]
Next, a second embodiment of the present invention will be described with reference to FIG. In the present embodiment, the same parts as those in the first embodiment are denoted by the same reference numerals to avoid redundant description.
In the present embodiment, as shown in FIG. 6, unlike the first embodiment shown in FIG. 2, a third selection switch 63 is provided instead of the first selection switch 61.

  The third selection switch 63 of this embodiment has a configuration in which two sets of two inputs and one output are used in parallel. That is, the third selection switch 63 simultaneously connects the first antenna 41 and the second antenna 42 to the television receiver 9 via the filter 8 or connects the second antenna 42 and the third antenna 43 to the filter 8. In order to switch to either state of simultaneous connection to the television receiver 9 via the switch, the state is selectively switched to one of the states.

  Therefore, according to Table 1 shown in FIG. 5, a plurality of antennas can be selected except for the configurations of 4) and 8). For example, when the television receiver 9 is a two-branch diversity television receiver, stable reception characteristics can be ensured by performing diversity reception using an antenna that can be used in the form of a mobile phone. Thus, the antenna selection to be used can constitute a 2-branch antenna by using two sets of the third antenna selection switch 63 as two inputs and one output.

For example, in the open state, the priority order of antennas used in diversity is as described above.
Whip antenna> Earphone antenna> Communication priority antenna
... (1)
Then, (I) When it is detected that the whip antenna is extended and the earphone antenna is connected, diversity is performed by a combination of the whip antenna and the earphone antenna. (II) When the whip antenna is extended and the earphone antenna is not connected, diversity is performed by a combination of the whip antenna and the mobile phone antenna. (III) Further, when the whip antenna is stored and the earphone antenna is connected, diversity is performed by a combination of the earphone antenna and the mobile phone antenna. (IV) Further, in the configuration in which the whip antenna is housed and the earphone antenna is not connected, that is, the configuration of 4) in Table 1, reception is performed in a single branch using only the mobile phone antenna that is the communication priority antenna.

  Next, in the case of the configuration 4) in Table 1, in the communication operation by W-CDMA, when the preset received signal strength is high, for example, when there are two or more bars indicating the received signal strength, the fourth An antenna 44 is used. However, when the second antenna 42 to be originally allocated is necessary for communication by W-CDMA, that is, when the number of bars indicating the received signal strength is one or less (when the received signal strength is weak), the same as in the first embodiment. As a TV broadcast receiving antenna, it is displayed on the liquid crystal display unit 12 or the TV screen with a mark or a character such as “extend the whip antenna (first antenna 41) or connect the earphone antenna (third antenna 43)”. The second antenna 42 is preferentially used for the communication function. At this time, the W-CDMA signal interferes with the television receiver 9, and sufficient sensitivity may not be ensured. However, a filter 8 that removes the W-CDMA signal is disposed in the television receiver to reduce sensitivity. Can be relaxed. As a result, reception continues in a single branch.

Next, the priority use order of antennas used for diversity reception for television broadcasts, in the closed state and the viewer state,
Whip antenna> Loop antenna> Earphone antenna
... (3)
Then, (I) When the whip antenna detects extension, diversity is performed by a combination of the whip antenna and the loop antenna. (II) When the whip antenna is stored and the earphone antenna is connected, diversity is performed by a combination of the earphone antenna and the loop antenna. (III) In the configuration in which the whip antenna is housed and the earphone antenna is not connected, that is, 8 in Table 1, reception is performed in a single branch using only the loop antenna.
In the case of the configuration of 8) in Table 1, contents or a mark for prompting “extend the whip antenna or connect the earphone antenna” is displayed on the liquid crystal display unit 12, and the whip antenna (first antenna 41) is extended. If the earphone antenna (third antenna 43) is not connected, the reception is continued with a single branch.

  Therefore, according to the present embodiment, with the above configuration, by changing the mobile phone antenna to the loop antenna in the closed state, 1seg DTV can receive with at least one antenna, and two antennas are selected. When possible, stable reception can be performed by performing diversity reception.

  The present invention is not limited to the above-described embodiment, and can be implemented in various forms without departing from the spirit of the invention.

  The mobile receiver of the present invention can be used with a mobile phone antenna in addition to the TV antenna, and the mobile phone antenna can change its shape when the housing is in the open state, the closed state, and the viewer state. Since one or more antennas can always be used, it is possible to ensure good reception quality in various usage conditions, and to achieve downsizing, and a folding mobile phone equipped with a TV function. Useful for telephones.

1 is a schematic diagram showing a configuration of an antenna in a foldable mobile phone with a built-in TV function according to a first embodiment of the present invention. Block diagram showing a configuration of an antenna in the mobile phone FIG. 2A shows a usage state of the mobile phone, (A) is a schematic configuration diagram showing an antenna in an open state, and (B) is a schematic configuration diagram showing an antenna in a closed view / viewer state. FIG. 4A shows the usage state of the mobile phone, (A) is a schematic plan view showing a case in an open state, (B) is a plan view showing the case in a closed state, and (C) is a case in a viewer state. Plan view showing The table | surface which shows the combination of the usage form of each antenna of the mobile telephone which concerns on this invention Schematic which shows the structure of the diversity receiver which concerns on the 2nd Embodiment of this invention. Configuration diagram showing antenna configuration of a conventional mobile phone

Explanation of symbols

1 First housing (upper housing)
11, 21 Short electrode 2 Second housing (lower housing)
41 First antenna (whipped antenna)
42 Second antenna (communication antenna)
43 3rd antenna (earphone antenna; external antenna)
44 4th antenna (inverted F antenna)
61A External antenna terminal 51 First feeding means 52 Second feeding means (feeding means)
53 Third power supply means (power supply means)
54 Fourth power supply means 55 Fifth power supply means 61 First selection switch (selection means)
62 Second selection switch (selection means)
63 Second selection switch (selection means)
7 Mobile phone part 8 Filter 9 Television receiver

Claims (4)

A mobile terminal device that includes a first antenna for broadcast reception, a second antenna configured to be able to receive and transmit broadcasts, and an external antenna for broadcast reception, and performs communication and broadcast reception by different wireless systems. And
In a state where the external antenna is not electrically connected, a mobile terminal device that receives the broadcast by selecting or simultaneously using one of the first antenna and the second antenna.   The portable terminal device according to claim 1, wherein the second antenna includes the power supply means for receiving the broadcast together with the power supply means for communication.   When performing the communication, if the communication state is worse than the preset state, the second antenna is used for the communication, and if the communication state is better than the preset state, the second antenna The mobile terminal device according to claim 1, further comprising selection means for using two antennas for the broadcast reception. A foldable structure including a first casing and a second casing, and a connecting portion that foldably connects the first and second casings;
The portable terminal device according to any one of claims 1 to 3, wherein the second antenna forms a loop antenna when the first and second housings are folded.

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