JP4469760B2 - Portable wireless device - Google Patents

Description

  The present invention relates to a portable wireless device, and more particularly to a portable wireless device that receives broadcast waves and the like in various frequency bands.

  Due to the high performance of display devices typified by liquid crystal display panels and the miniaturization of wireless circuits, portable wireless devices have appeared and have come into wide use. Also, with the digitalization of terrestrial television (hereinafter referred to as “TV”) broadcast signals, TV broadcast services using digital signals for portable wireless devices are about to be started. For example, in Japanese terrestrial digital TV broadcasting, a UHF (Ultra High Frequency) band of 470 MHz to 700 MHz is used, and a different frequency is assigned to each channel. In Japanese terrestrial digital TV broadcasting, horizontal polarization is used as in the case of conventional analog TV broadcasting.

  The following two types of devices are assumed as portable devices used for receiving TV broadcast waves and watching TV broadcasts. One apparatus is a conventional general portable TV receiver such as a portable television described in Patent Document 1 described later, and the other apparatus is a wireless communication apparatus such as a mobile phone.

  FIG. 19 shows the appearance of a conventional general portable TV receiver. Referring to FIG. 19, portable TV receiver 800 is attached from casing 802 toward the outside of casing 802, and includes a rod antenna 804 for receiving broadcast waves. A broadcast wave transmitted from a broadcast station is received by the rod antenna 804 and detected and tuned by a tuner (not shown) inside the TV receiver 800. The broadcast signal thus obtained is reproduced by a reproduction device such as a display device and a speaker.

  The wavelength of the broadcast wave is different for each channel. When the length (resonance length) of the rod antenna 804 is appropriate for the wavelength of the broadcast wave, the gain of the target channel with respect to the broadcast wave is improved. Therefore, the rod antenna 804 is generally provided with a multistage retractable extension mechanism so that the resonance length can be adjusted according to the wavelength of the broadcast wave that differs for each channel.

  In general portable TV receiver 800, an antenna system including rod antenna 804 and a ground conductor is formed. In such an antenna system, when a large conductor is used as the ground conductor, the bandwidth can be increased accordingly. For this reason, in a general portable TV receiver 800, a relatively large part of the conductor parts constituting the main body, such as a conductor portion of the housing 802, is used as a ground conductor for the rod antenna 804.

  Even when horizontal polarization is transmitted from the transmission station, horizontal polarization and vertical polarization are mixed in the received radio wave in a multipath environment mainly composed of indirect waves. Therefore, the rod antenna 804 is often attached to the housing 802 so as to be rotatable. As a result, the rod antenna 804 can be tilted at a tilt corresponding to the polarization component. The characteristic of the rod antenna 804 can be changed to be suitable for receiving broadcast waves of the target channel by pulling out the rod antenna 804 and adjusting the resonance length, and further rotating and adjusting the tilt. it can.

Generally, a rod antenna or a helical antenna is used as an antenna of a mobile phone. Currently, either the 800 MHz band or the 1.5 GHz band is used in the mobile phone network. This frequency is higher than the broadcast wave, and the wavelength is shorter than that of the broadcast wave. In addition, the bandwidth of radio waves used in mobile phone networks is narrower than the bandwidth of broadcast waves. The antenna of a cellular phone does not have to adjust the resonance length unlike the antenna of a portable TV receiver, and therefore a general cellular phone antenna does not have a multistage drawer mechanism. Further, the ground conductor for the antenna is not provided with a larger ground conductor than the ground conductor for the antenna of the portable TV receiver.
Japanese Utility Model Publication No. 1-86305

  When noise is mixed in an analog broadcast signal, the playback signal is somewhat disturbed but cannot be played back at all. However, when noise is mixed in a digital signal, the signal cannot be decoded in the process of signal processing and may not be reproduced at all. Therefore, when a TV broadcast signal is digitized, an antenna for receiving the broadcast wave is required to have a higher gain than an antenna used for receiving a conventional analog broadcast.

  The rod antenna 804 can receive radio waves with high sensitivity with respect to a wide frequency bandwidth as long as it is properly adjusted. However, this requires troublesome adjustment of the resonance length and inclination of the antenna according to the channel. Moreover, the direction of the antenna from which a good reception state can be obtained is not always a convenient direction for the user. For this reason, the rod antenna 804 that has been drawn out may hit the surrounding object, and the rod antenna 804 may not be able to be directed in a suitable direction. Even if the rod antenna 804 can be directed in a suitable direction, there is a risk that something will be caught on the antenna and the surroundings or the rod antenna 804 itself may be destroyed, or the whole body may fall or fall. . That is, the rod antenna 804 is difficult to handle for the user.

  Since the antenna of the mobile phone is small, it is easier to handle than the rod antenna 804. However, the frequency band of the broadcast wave is lower than the frequency band of the mobile phone network. Therefore, in order to obtain a good reception state, an antenna having a resonance length longer than the resonance length of an antenna generally used in mobile phones is required. In order to cope with a wide frequency bandwidth, it is necessary to prepare a larger ground conductor. However, with the current mobile phone case size, it is difficult to provide a sufficiently large ground conductor in the case.

  SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a portable wireless device that is space-saving, has a wide bandwidth and high sensitivity, and can easily receive a radio wave of a desired frequency.

  A portable wireless device according to the present invention includes a first casing, a second casing, and a rotating unit provided to connect the first casing and the second casing to each other so as to be rotatable. An antenna element attached to the first housing, a feed line electrically connected to the antenna element, a ground conductor for the antenna element attached to the second housing, and a second housing A wireless circuit attached to the antenna element and connected to the antenna element via the feeder line, and a user provided to support the first casing, the second casing, and the rotating unit provided in the second casing And a grip portion to be gripped.

  According to this portable wireless device, the antenna element is spatially separated from both the wireless circuit and the ground conductor by the first housing, the second housing, and the rotating unit. Therefore, the coupling or binding between the ground conductor and the antenna element is reduced. The first housing and the second housing to which the antenna element is attached are connected so as to be rotatable via a rotating portion. Therefore, the direction of the antenna element can be adjusted to be suitable for reception of radio waves simply by grasping the second housing and rotating the first housing relative to the second housing. it can. Since adjustment can be performed without pulling out like a rod antenna, it is easy for the user to handle. In addition, when the user supports the portable wireless device, a grip portion provided in the second housing is used. Therefore, the user's body can be prevented from touching the antenna element attached to the first housing, and the influence of the human body on the characteristics of the antenna element can be reduced. In addition, a ground conductor for the antenna element is attached to the second casing provided with the grip portion. For this reason, when the user grips the grip portion, coupling by the electromagnetic field occurs between the ground conductor and the user's body. Thereby, a human body can be functioned as a suitable grounding conductor with respect to an antenna element. That is, the ground conductor can be equivalently enlarged without increasing the size of the ground conductor itself. An antenna system having good characteristics with a wide frequency bandwidth can be formed without installing a large ground conductor in the second housing.

  Preferably, the rotation unit is configured such that the first housing and the second housing rotate with respect to each other about the rotation unit, and at an arbitrary angle within a predetermined range centering on the rotation unit. And means for connecting the first housing and the second housing such that the angle between the first housing and the second housing is maintained.

  For example, the portable wireless device is gripped so that the second casing is positioned vertically downward from the first casing. By rotating the first casing relative to the second casing in this state, the inclination and effective height of the antenna element attached to the first casing can be adjusted. Furthermore, radio waves can be transmitted and received with appropriate sensitivity by maintaining the angle between the first casing and the second casing with the rotation section as the center at an angle at which appropriate sensitivity is obtained. Can do. Accordingly, it is possible to obtain a suitable reception characteristic or radiation characteristic over a wide band while being small.

  More preferably, the first casing is maintained at a position that forms an arbitrary angle in the range of 180 degrees or more and less than 360 degrees with the second casing by means for coupling. Functions as a body stand.

  Since the first housing functions as a stand for the second housing, when the portable wireless device is placed on a desk or the like, it does not take up extra space and is convenient.

  Preferably, each of the first housing and the second housing has a main surface, and the portable wireless device further includes a display unit provided on the main surface of the second housing. The rotating unit has a first position where the main surface of the first housing overlaps the main surface of the second housing, and the main surface of the first housing and the main surface of the second housing are predetermined. Means for connecting the first housing and the second housing so as to be rotatable about a predetermined axis between the second position forming an angle is included. Thereby, in the first position, the first housing functions as a lid for the display unit of the second housing.

  When the first housing functions as a lid for the display portion, the display portion can be protected and the portable wireless device can be made compact. When using the portable wireless device, the first casing is rotated to the second position with respect to the second casing. Then, the antenna element attached to the first housing and the ground conductor and the radio circuit housed in the second housing are naturally spatially separated. Further, the antenna reception height of the antenna element can be adjusted by adjusting the angle between the main surface of the first housing and the main surface of the second housing. Therefore, the antenna can be adjusted to a state suitable for transmission / reception of radio waves by a natural operation of opening the lid covering the display unit.

  The portable wireless device may further include an antenna ground line that is provided so as to be substantially parallel to the feed line via a predetermined dielectric and is electrically connected to the ground conductor.

  The antenna ground line reduces the influence of electromagnetic waves around the antenna feed line on the signal transmitted through the antenna feed line. Further, the coupling and binding between the antenna element and the ground conductor in the second housing can be reduced.

  The portable wireless device may further include a circuit board provided in the second housing, and the ground conductor for the antenna element may include a ground pattern formed on the circuit board.

  The ground pattern of the circuit board provided in the second housing can function as a suitable ground conductor for the antenna element. Therefore, it is possible to form an antenna system having good characteristics with a simple, low cost, space saving and wide frequency bandwidth.

  Preferably, the grip portion is provided in the second casing, and is formed of a conductor that is gripped by a user to support the first casing, the second casing, and the rotating portion, and the antenna element. A gripping member electrically connected to the ground conductor is included.

  The gripping member is electrically connected to the ground conductor for the antenna. When the user grips the gripping member, the user's body and the gripping member are electrically connected. As a result, the ground conductor and the user's body are electrically connected via the gripping member. Thereby, since the human body and the ground conductor for the antenna element are electrically integrated, the human body can function more efficiently as a suitable ground conductor for the antenna element. That is, the ground conductor can be equivalently enlarged without increasing the size of the ground conductor itself. Even if a large ground conductor is not installed in the second housing, an antenna system having better characteristics can be formed with a wide frequency bandwidth. Therefore, a space-saving and high-performance portable wireless device can be provided.

  Preferably, the gripping unit is provided in the second housing, and the user holds the gripping member that the user grips to support the first housing, the second housing, and the rotating unit, and the gripping member by the user. And a projecting member made of a conductor, which is formed on the second casing so as to be easily gripped by the user when gripped, and is electrically connected to a ground conductor for the antenna element.

  The protruding member is electrically connected to the ground conductor. When the user grips the grip member, when the projection member touches the user's body, the user's body and the projection member are electrically connected. As a result, the ground conductor and the user's body are electrically connected via the protruding member. Thereby, a human body can be functioned as a suitable grounding conductor with respect to an antenna element. That is, the ground conductor can be equivalently enlarged without increasing the size of the ground conductor itself. An antenna system having good characteristics with a wide frequency bandwidth can be formed without installing a large ground conductor in the second housing. Therefore, a space-saving and high-performance portable wireless device can be provided. In addition, electric shock to the human body can be prevented and static electricity can be prevented.

The second housing may have a predetermined electric resistance, and the protruding member may have an electric resistance lower than the predetermined electric resistance.

  Preferably, the antenna element includes a linear antenna element having a predetermined shape made of a linear conductor having a predetermined length.

  The line antenna element is a linear conductor, but its outer shape is maintained by being attached to the first housing. Furthermore, the orientation and height of the antenna element can be adjusted by rotating the first housing. Therefore, it is not necessary to pull out the line antenna element from the first housing. Therefore, unlike an antenna element constituted by a conventional rod antenna, it can be prevented from being bent, broken or obstructed.

  More preferably, the line antenna element has a shape bent at one or a plurality of locations.

  Therefore, when the line antenna element has a bent shape, the length of the first casing necessary to maintain the shape is shortened. Therefore, the portable wireless device can be made compact. In addition, since the line antenna element has a bent shape, one antenna element can cope with both horizontal polarization and vertical polarization. Therefore, strict direction adjustment as in the case of using a conventional rod antenna is not necessary. Therefore, radio waves can be easily received in a multipath environment.

  The shape of the line antenna element may include a spiral shape.

  An antenna element formed of a spiral-shaped linear conductor can obtain high sensitivity to both horizontally and vertically polarized waves. Therefore, strict direction adjustment as in the case of using a conventional rod antenna is not necessary. Further, the antenna element can be saved in space by making the linear conductor spiral.

  The antenna element may be formed of a plate-shaped conductor having a predetermined shape.

  The antenna element may be formed of a loop-shaped conductor.

  An antenna element made of a loop-shaped linear conductor can obtain high sensitivity to both horizontally and vertically polarized waves. Therefore, strict direction adjustment as in the case of using a conventional rod antenna is not necessary.

  Preferably, the feed line is electrically connected to the antenna element at a position where the distance from the rotating portion is shortest among positions on the antenna element in a state where the antenna element is attached to the first housing. Is done.

  Coupling and binding between the ground conductor in the second housing and the antenna element attached to the first housing can be reduced.

  Preferably, the portable radio apparatus further includes a connector for electrically connecting the feed line and a predetermined external antenna element.

  It is possible to improve the gain of the antenna system by electrically connecting a predetermined external antenna element and the feed line via the connector.

  The portable wireless device may further include a predetermined external antenna element connected to the antenna element via the connector. The external antenna element may include a predetermined strap-shaped antenna element.

  The portable wireless device may further include a predetermined external antenna element connected to the antenna element via the connector. The external antenna element includes a predetermined earphone antenna element.

  The connector may include means for electrically connecting the antenna element and the external antenna element directly.

  By directly connecting the antenna element and the external antenna element and increasing the resonance length of the antenna, the gain of the antenna system can be improved.

  The connector may include a combiner for combining a signal generated by the antenna element and a signal generated by the external antenna element.

  By combining a signal generated by the antenna element and a signal generated by the external antenna element by a combiner, it is possible to ensure broadband characteristics while appropriately maintaining the input impedance in the entire antenna system.

  The connector may include a switch for selectively connecting the antenna element and the external antenna element to the feed line in response to a predetermined control signal being given.

  Therefore, by giving the control signal, it is possible to selectively use the element that is suitable for wireless communication, among the antenna element and the external antenna element.

  The radio circuit generates a predetermined feedback control signal, and the switch is configured to selectively connect the antenna element and the external antenna element to the feed line in response to the feedback control signal being given. Means may be included.

  According to the present invention, the coupling or binding between the ground conductor and the antenna element is reduced, and the first casing is held in the second casing by gripping the second casing without being pulled out like a rod antenna. The direction of the antenna element can be adjusted so as to be suitable for transmission / reception of radio waves simply by rotating with respect to the housing. Further, the user's body can be prevented from touching the antenna element, and the influence of the human body on the characteristics of the antenna element can be reduced. Furthermore, the antenna reception height can be easily adjusted, and suitable characteristics can be obtained over a wide band while being compact.

  Since the first housing functions as a stand for the second housing, it can be placed on a desk or the like without taking up extra space. In addition, when using the portable wireless device, the reception height of the antenna is appropriately adjusted by a natural operation of opening and closing the lid. While protecting a display part, a portable radio | wireless apparatus can also be made compact.

  Further, the coupling and binding between the antenna element and the ground conductor in the second housing can be reduced.

  The ground pattern on the human body or the circuit board can function as a ground conductor for the antenna element, and the ground conductor can be equivalently enlarged without increasing the size of the ground conductor itself for the antenna element. Therefore, it is possible to form an antenna system having good characteristics with a simple, low cost, space saving and wide frequency bandwidth. By maintaining the outer shape of the antenna element by the first housing, it does not bend, bend, or get in the way like a rod antenna. In addition, it is possible to provide a portable wireless device that is space-saving and can handle both horizontal polarization and vertical polarization and does not require strict direction adjustment. Further, it is possible to improve the gain of the antenna system by electrically connecting a predetermined external antenna element and the feed line.

[First Embodiment]
Hereinafter, an embodiment of the present invention will be described with reference to the drawings. In the drawings used for the following description, the same parts are denoted by the same reference numerals. Their names and functions are also the same. Therefore, detailed description thereof will not be repeated.

  FIG. 1 shows an appearance of portable broadcast receiving apparatus 100 according to the present embodiment. Referring to FIG. 1, portable broadcast receiving device 100 includes a first housing portion 102 and a second housing portion 104, and a first housing portion 102 and a second housing made of flat, substantially rectangular parallelepiped insulators. And a rotation unit 106 provided to connect the casing unit 104 to each other so as to be rotatable.

  The portable broadcast receiving apparatus 100 is further attached to a surface of the second housing portion 104 facing the first housing portion 102 (hereinafter, this surface is referred to as “the front surface of the second housing portion 104”). A display unit 112 for displaying and outputting the broadcast signal is included. The portable broadcast receiving apparatus 100 is further attached to the second casing unit 104, and an operation unit 114 for accepting an operation by a user and the second broadcast unit 100 are attached to the second casing unit 104 and use the portable broadcast receiving apparatus 100. And a gripper 116 that the user grips. The operation unit 114 includes a push button, a switch, and the like, and an electric circuit associated therewith, and generates an electric signal corresponding to an operation by the user. The grip 116 is made of a conductor and serves as an electrical contact with the user's body in an antenna system described later.

  The portable broadcast receiving apparatus 100 is further attached to a surface of the first housing unit 102 facing the second housing unit 104 (hereinafter, this surface is referred to as “the front surface of the first housing unit 102”). An antenna element 120 for receiving a broadcast wave is included. The antenna element 120 is a polygonal loop antenna composed of a wire-like or flat conductor line.

  FIG. 2 shows a schematic configuration inside portable broadcast receiving apparatus 100. Referring to FIG. 2, portable broadcast receiving apparatus 100 further includes a tuner unit 132 for performing tuning and detection of broadcast waves, and a ground conductor plate 134 that serves as a ground conductor for antenna element 120 and tuner unit 132. Including. The portable broadcast receiving apparatus 100 is further formed on the circuit board 140, the circuit board 140, various electric circuits for operating the portable broadcast receiving apparatus 100, and formed on the circuit board 140. And a ground pattern serving as a ground conductor for the circuit. The tuner unit 132, the ground conductor plate 134, and the circuit board 140 are all housed in the second housing unit 104.

  The portable broadcast receiving apparatus 100 further includes a flexible substrate 130 housed in the rotating unit 106, and a conductor line formed on the flexible substrate 130 for electrically connecting the antenna element 120 and the tuner unit 132. Including. Details of the conductor lines formed on the flexible substrate 130 will be described later with reference to FIG.

  FIG. 3 schematically shows an electrical connection relationship of each part shown in FIGS. 1 and 2. Referring to FIG. 3, a display unit 112, an operation unit 114, and a tuner unit 132 are connected to the electric circuit on the circuit board 140. This electric circuit controls the tuner unit 132 based on a signal generated by the operation unit 114. In addition, this electric circuit processes the signal tuned and detected by the tuner unit 132 by a predetermined processing method and causes the display unit 112 to display the signal. Note that the processing of various signals performed by the display unit 112, the operation unit 114, the tuner unit 132, and the electric circuit on the circuit board 140 and the circuit configuration therefor are the same as those of a general broadcast receiving apparatus. The description of the configuration and operation details is omitted.

  The ground conductor plate 134 is electrically connected to the tuner unit 132 and the ground pattern on the circuit board 140. The ground conductor plate 134 is further connected to the grip portion 116. That is, the ground conductor plate 134, the ground pattern on the circuit board 140, the gripping part 116, and the user's body that touches the gripping part 116 are electrically connected. These serve as ground conductors for the tuner section 132 and the electric circuit on the circuit board 140. The plurality of conductor lines formed on the flexible substrate 130 are electrically connected to the conductor line electrically connected to the tuner part 132 in the second housing part 104 and the ground conductor plate 134 in the second housing part 104. Conductor lines connected to each other. The former conductor line is further electrically connected to the antenna element 120 at the contact 122. This point is a feeding point of the antenna element. A system composed of the antenna element 120, the conductor line on the flexible substrate 130, and the ground conductor described above functions as one antenna system.

  FIG. 4 schematically shows the configuration of the antenna system of the portable broadcast receiving apparatus 100. Referring to FIG. 4, a plurality of parallel conductor lines 150, 152 </ b> A, and 152 </ b> B are formed on flexible substrate 130. One of the conductor lines 150 is connected to the tuner unit 132 and the feeding point 122 of the antenna element 120. The conductor line 150 serves as a feed line between the tuner unit 132 and the antenna element 120. Hereinafter, the conductor line 150 is referred to as an “antenna feed line”. On the other hand, the lines 152A and 152B are connected to the ground conductor plate 134 on the second housing portion 104 side. The first housing portion 102 side of these lines 152A and 152B is an open terminal. Hereinafter, these lines 152A and 152B are referred to as “antenna ground lines”.

  On the flexible substrate 130, the antenna feed line 150 is disposed between the parallel antenna ground lines 152A and 152B. The antenna feed line 150 is not electrically connected to the antenna ground lines 152A and 152B. That is, the antenna feed line 150 and the antenna ground lines 152A and 152B form a coplanar line.

  In this antenna system, the antenna element 120 is attached to the first housing portion 102, and the tuner portion 132, the ground conductor plate 134, and the circuit board 140 are housed in the second housing portion 104. The feeding point of the antenna element 120 and the tuner unit 132 and the ground conductor plate 134 are connected by the coplanar line housed in the rotating unit 106. Therefore, the antenna element 120 is disposed at a position spatially separated from each of the tuner unit 132, the ground conductor plate 134, and the circuit board 140. Thus, coupling or binding between the antenna element 120 and the ground conductor for the antenna element is reduced. In addition, the influence of the electromagnetic wave noise generated by the display unit 112, the operation unit 114, and the electric circuit on the circuit board 140 in the second housing unit 104 on the antenna element 120 is reduced.

  The ground conductor plate 134 is further provided on the second housing portion 104 side of the portable broadcast receiving device 100 and further touches the human body via the grip portion 116. When the user grips the grip portion 116, the human body becomes a good ground conductor for the antenna.

  Furthermore, by connecting the antenna element 120 at a spatially separated position, the tuner section 132, and the ground conductor plate 134 with a conductor line on the flexible substrate 130, the input impedance of the antenna system is reduced. In addition, the shape of the antenna feeding line 150 and the antenna grounding lines 152A and 152B of the flexible substrate 130, the interval between the lines, the material of the line conductor, and the like are selected in advance according to the radio wave assumed to be received. Thus, the input impedance in the antenna system is matched.

  The first housing unit 102 and the second housing unit 104 rotate with respect to each other about the rotation unit 106. That is, the front surface of the first housing unit 102 and the front surface of the second housing unit 104 form an arbitrary angle with the rotation unit 106 as the center. The rotation unit 106 maintains this angle at an arbitrary angle.

  FIG. 5 shows the positional relationship between the antenna element 120 and the ground conductor plate 134 when the portable broadcast receiving apparatus 100 is used from the viewpoint of the rotation axis direction of the rotating unit.

  FIG. 5A shows a state where the front surface of the first housing portion 102 and the front surface of the second housing portion 104 are rotated with each other so as to face each other. In this state, the first housing unit 102 covers the display unit 112 on the front surface of the second housing unit 104. Therefore, the first housing unit 102 functions as a lid for the display unit 112.

  FIG. 5B illustrates the first housing unit 102 with the rotation unit 106 as the center so that the front surface of the first housing unit 102 forms an angle of approximately 90 degrees with respect to the front surface of the second housing unit 104. The rotated state is shown. In this state, when the portable broadcast receiving device 100 is placed on the floor 160 so that the front surface of the second housing portion 104 is up, the first housing portion 102 is disposed at a higher position than the second housing portion 104. Is done. Therefore, the antenna element 120 attached to the first housing unit 102 is disposed at a position farther from the floor 160 than the tuner unit 132 in the second housing unit 104. The antenna element 120 is further arranged at a position farther from the floor 160 than both the ground conductor plate 134 and the conductor connected to the ground conductor plate 134. Therefore, good reception characteristics can be obtained.

  Furthermore, when the angle formed by the first housing portion 102 and the second housing portion 104 is changed, the height of the antenna element 120 from the floor 160 changes, and the effective length of the antenna element 120 with respect to vertical polarization is changed. Changes. Therefore, reception can be performed at a reception height suitable for receiving radio waves having a frequency to be received.

  FIG. 5C illustrates that the first housing unit 102 is centered on the rotating unit 106 so that the front surface of the first housing unit 102 forms an angle of approximately 270 degrees with respect to the front surface of the second housing unit 104. It is a figure which shows the state rotated. In this state, the first housing unit 102 serves as a stand for the second housing unit 104, and the portable broadcast terminal device 100 can be made independent.

  As described above, portable broadcast receiving apparatus 100 according to the present embodiment arranges antenna element 120 in first casing portion 102 and provides ground conductor plate 134 serving as a ground conductor for antenna element 120 in the second casing. By disposing in the portion 104, the coupling and binding between the antenna element 120 and the ground conductor can be reduced.

  The antenna element 120 has a polygonal shape, and can receive radio waves of both horizontal polarization and vertical polarization in a multipath environment in which horizontal polarization and vertical polarization are mixed. Therefore, a strict angle adjustment as in the case of using a rod antenna is unnecessary.

  The antenna element 120 is attached to the first housing unit 102. The first housing unit 102 and the second housing unit 104 can rotate with respect to each other about the rotating unit 106. When not in use, the first housing portion 102 and the second housing portion 104 can be overlapped and folded to facilitate storage. At this time, the first housing unit 102 can be used as a lid of the display unit 112. The display unit 112 can be protected, which is convenient.

  The rotating unit 106 can fix the first housing unit 102 and the second housing unit 104 at an arbitrary angle. Therefore, the angle between the first housing unit 102 and the second housing unit 104 is adjusted in a state where the second housing unit 104 is held or placed so as to be below the first housing unit 102. By doing so, the effective height of the antenna can be easily adjusted. Accordingly, it is possible to obtain a space-saving and wideband reception characteristic. Further, the first housing unit 102 can be used as a stand for the second housing unit 104. Therefore, when using it on the floor or desk, it takes up space and is convenient.

  In addition, the operation unit 114 having a large contact opportunity with the user is attached to the second housing unit 104, and the grip unit 116 is further attached to the second housing unit 104. When the user uses the portable broadcast receiving apparatus 100 while holding the holding unit 116, an effect of reducing the probability that the user's body and the antenna element 120 are in contact with each other can be expected. Furthermore, the ground conductor plate 134 in the second housing portion 104 can be electrically connected to the human body via the conductor portion of the grip portion 116. Thereby, since the human body becomes a large and good ground conductor, the area of the ground conductor of the antenna element can be equivalently widened. Therefore, the gain is improved in a wide frequency band.

  Further, by forming a coplanar line made up of the antenna feed line 150 and the antenna ground lines 152A and 152B on the flexible substrate 130 in the rotating unit 106, the coupling and binding between the antenna element 120 and the ground conductor are reduced. be able to.

<Modification of First Embodiment>
The antenna element 120 of the portable broadcast receiving apparatus 100 according to the first embodiment is a polygonal loop antenna. However, various other shapes of the antenna element are assumed. FIG. 6 shows another example of the shape of the antenna element.

  An antenna element 170 shown in FIG. 6A is a flat antenna element made of a conductive plate, and its shape is a triangle. The feeding point 172 of the antenna element 170 is provided at the apex of the antenna element 170, for example.

  The antenna element 180 shown in FIG. 6 (B) is made of a conductor on a linear or narrow flat plate, has bending points at two locations, and its shape is an open curve shape with a part of one side of a triangle cut out. is there. The feeding point 182 of the antenna element 180 is provided, for example, at one end near the apex of the above-described triangle among the ends of the conductor line. The other end of the antenna element 180 is opened.

  An antenna element 190 illustrated in FIG. 6C is formed of a linear or narrow flat conductor line, has a large number of bending points, and has a spiral shape. The feeding point 192 of the antenna element 190 shown in FIG. 6C is provided, for example, at the end located outside the spiral among the ends of the conductor line. The other end is opened.

  The antenna element 200 shown in FIG. 6D is formed of a linear or narrow flat conductor line, has a bending point at one place, and has a so-called inverted L shape. A feeding point 202 of the antenna element 200 shown in FIG. 6D is provided at the end on the short side of the ends of the conductor line, for example. The other end is opened.

  These antenna elements 170, 180, 190, and 200 are preferably selected according to the size of the first housing unit 102 and the frequency band of the reception target radio wave. When the target frequency band is the UHF band, the antenna element 170 is suitable if the maximum width of the first housing portion 102 exceeds 100 mm. If the maximum width is 100 mm or less, the antenna elements 180, 190, and 200 that can take a long resonance length with a small area are suitable.

  Since the antenna element 190 has many resonance points and resonates at various frequencies, it is suitable for wideband reception. In addition, an antenna element having a high gain with respect to the reception target frequency band can be formed by appropriately selecting the entire length of the line and the interval between adjacent lines. For example, when the center frequency of the reception target band is 550 MHz, the wavelength λ of the radio wave corresponding to the center frequency is about 545 mm, and a line having a resonance length longer than ½ wavelength (about 280 mm) is formed. It is desirable. In the antenna element 190, when the width of the conductor line is about 0.5 mm to 1 mm and the distance between the conductor lines is about 0.5 to 1 mm, even if the maximum width of the first housing portion 102 is 100 mm or less, A resonance length of about 280 mm can be ensured.

  Regardless of the antenna shape, the antenna element has a shape having the same resonance length in two directions so as to correspond to the horizontal and vertical polarization components, and the ground conductor in the second housing portion 104. It is desirable to arrange in a space separated from the plate 134 by about 1/30 or more of the wavelength of the target band.

[Second Embodiment]
It is also possible to lengthen the resonance length by connecting a conductor element to the antenna element 120 of the portable broadcast receiving apparatus 100 according to the first embodiment. FIG. 7 shows an appearance of the portable broadcast terminal apparatus 220 according to such an embodiment. Referring to FIG. 7, this portable broadcast receiving apparatus 220 is a flexible string-like element having a conductor line inside, in addition to the portable broadcast receiving apparatus 100 shown in FIG. A strap antenna 230 is attached to the position by an attachment member (not shown). The strap antenna 230 has a ring shape. The resonance length L of the strap antenna 230 itself may be at least about ¼ wavelength (about 140 mm) to ½ wavelength (about 280 mm) of radio waves having a center frequency of 550 MHz of UHF band broadcast waves.

  FIG. 8 schematically shows the configuration of the antenna system of the portable broadcast receiving apparatus 220. Referring to FIG. 8, in this antenna system, antenna feed line 150 on flexible substrate 130 feeds antenna element 120 having one end attached to first housing portion 102, similarly to the antenna system shown in FIG. The other end is connected to the point 122, and the other end is connected to the tuner unit 132 in the second housing unit 104. The antenna ground lines 152A and 152B on the flexible substrate 130 are the same as those in the first embodiment shown in FIG. 4, and one end is connected to the ground conductor plate 134 in the second housing unit 104, and the other. The end of is an open terminal.

  The antenna feed line 150 is further electrically connected to the strap antenna 230 at the feed point 122 of the antenna element 120. The strap antenna 230 is electrically integrated with the antenna element. Therefore, the antenna system of the portable broadcast receiving apparatus 220 includes the antenna element 120 and the strap antenna 230, the antenna feed line 150 and the antenna ground lines 152A and 152B on the flexible substrate 130, the ground conductor plate 134, and the ground conductor plate 134. It is formed by each connected conductor.

  In portable broadcast receiving apparatus 220 according to the present embodiment, by attaching strap antenna 230, antenna element 120 and strap antenna 230 are electrically integrated, and the resonance length is increased. Therefore, reception with high sensitivity and wide bandwidth becomes possible. In addition, when the strap antenna 230 is suspended from the main body of the portable broadcast receiving apparatus 220, the strap antenna 230 is positioned at a height different from the ground height of the antenna element 120. Therefore, a pseudo space diversity effect can be obtained. In addition, unlike the rod antenna, the strap antenna 230 is not damaged even if it is bent or put in a pocket as it is. Therefore, the strap antenna 230 can constitute an antenna having an appropriate resonance length and not disturbing the user.

  Note that the strap antenna 230 may be removable or replaceable.

[Third Embodiment]
In the antenna system of the portable broadcast receiving apparatus 220 according to the second embodiment, the antenna element 120 and the strap antenna 230 are electrically integrated to function as one antenna element. In the portable broadcast receiving apparatus according to the third embodiment shown below, unlike this, an external antenna element can be connected separately from the antenna element mounted on the main body, and further mounted on the main body. The antenna element in the antenna system of the portable broadcast receiving apparatus is selected from the selected antenna element and the external antenna element.

  FIG. 9 schematically shows the appearance of portable broadcast receiving apparatus 300 according to the present embodiment, and FIG. 10 schematically shows the configuration of the antenna system inside portable broadcast receiving apparatus 300. Referring to FIG. 9, portable broadcast receiving device 300 includes first casing unit 102, second casing unit 104, and circuit that are the same as those of portable broadcast receiving device 100 according to the first embodiment. A moving unit 106, a display unit 112, an operation unit 114, and a grip unit 116 are included. Portable broadcast receiving apparatus 300 further includes antenna element 180 shown in FIG. 6 instead of antenna element 120 of portable broadcast terminal apparatus 100 according to the first embodiment. Portable broadcast receiving apparatus 300 further includes a strap antenna 230. This strap antenna is the same as that according to the second embodiment.

  The portable broadcast receiving apparatus 300 further includes an earphone antenna 310 that serves as an earphone and an auxiliary antenna element, and an earphone terminal 312. The earphone antenna 310 is connected to the first cable 320 connected to the earphone terminal 312, the end of the first cable 320 opposite to the earphone terminal 312 side, and connected to the earphone power supply terminal 322 and the earphone power supply terminal 322. The second cable 324A and the third cable 324B, and the earphones 326A and 326B connected to the second cable 324A and the third cable 324B, respectively. The first cable 320 serves as a transmission path from the earphone terminal 312 to the earphone power supply terminal 322 for a signal to be supplied to the earphones 326A and 326B and a line for antenna power supply in the earphone antenna 310. The second cable 324A and the third cable 324B serve as a signal transmission path to the earphones 326A and 326B and an antenna element. As will be described later, the first cable 320 is an unbalanced line, and the second cable 324A and the third cable 324B are balanced lines. The earphone power supply terminal 322 has a function of performing balanced / unbalanced conversion.

  Each of the first cable 320, the second cable 324A, and the third cable 324B includes a conductor line and a covering, and can be bent or wound into an arbitrary shape. The lengths of the second cable 324A and the third cable 324B are preferably adjusted according to the wavelength corresponding to the center frequency of the operating frequency. For example, assuming a TV broadcast wave in the UHF band, it is preferable that the lengths of the second cable 324A and the third cable 324 are about 280 mm.

  Referring to FIG. 10, portable broadcast receiving device 300 further includes a flexible substrate 130 and a conductor line formed thereon, which are the same as portable broadcast receiving device 100 according to the first embodiment. The portable broadcast receiving apparatus 300 further includes a circuit board 140 and an electric circuit formed thereon that are the same as the portable broadcast receiving apparatus 100 according to the first embodiment. The portable broadcast receiving apparatus 300 is further connected to the earphone antenna 310 via the flexible substrate 130 and the earphone terminal 312, and the switch 340 for switching between the antenna element 180 and the strap antenna 230 and the earphone antenna 310, A tuner unit 360 that is connected to the switcher 340, performs tuning and detection using the antenna element selectively connected by the switcher 340, generates a predetermined feedback control signal, and applies it to the switcher 340. Including.

  FIG. 11 schematically shows the configuration of the antenna system of the portable broadcast receiving apparatus 300. Referring to FIG. 11, in the antenna system according to the present embodiment, the switch 340 and the tuner unit 360 are grounded by the ground conductor plate 134. The earphone terminal 312 has a ground portion 370 that is electrically connected to the ground conductor plate 134 and a power feeding portion 372 that is connected to the switch 340.

  Portable broadcast receiving apparatus 300 according to the present embodiment has two antenna systems. That is, one antenna system includes the antenna element 180 and the strap antenna 230, the antenna feed line 150 and the antenna ground lines 152A and 152B on the flexible substrate 130, the ground conductor plate 134, and the ground conductor plates 134 connected thereto. An antenna system composed of a conductor. This antenna system is referred to as a first antenna system. The other antenna system is an antenna system including an earphone antenna 310, an earphone terminal 312, a ground conductor plate 134, and each conductor connected to the ground conductor plate 134. Hereinafter, this antenna system is referred to as a second antenna system. The first antenna system is similar to the antenna system according to the second embodiment except for the difference in antenna elements, and the function is the same as that of the antenna system according to the second embodiment. is there. Therefore, detailed description thereof will not be repeated.

  In the second antenna system, the ground portion 370 and the power feeding portion 372 of the earphone terminal 312 form an unbalanced terminal. The first cable 320 connected to the earphone terminal 312 is an unbalanced line. The earphone power supply terminal 322 performs balanced / unbalanced conversion and supplies power to the second cable 324A and the third cable 324B. Second cable 324 </ b> A and third cable 324 </ b> B receive power from earphone power supply terminal 322. Accordingly, the earphone antenna 310, the antenna terminal 312, the ground conductor plate 134, and the conductor connected to the ground conductor plate 134 form one antenna system.

  When the user grips and uses the portable broadcast receiving apparatus 300, the antenna element in the first antenna system is positioned near the user's hand. In contrast, when the earphone antenna 310 is worn by the user, the earphone antenna 310 is positioned from the user's head to the neck. That is, the antenna element in the second antenna system is positioned at a height near the user's head and neck. When reception is performed at two positions with different heights, there is a difference between the reception sensitivity obtained at one position and the reception sensitivity obtained at the other position. That is, the reception sensitivity at one position is higher than the reception sensitivity at the other position.

  The switch 340 selectively connects the first antenna system and the second antenna system to the tuner unit 360. The tuner unit 360 performs tuning and detection using the connected antenna system, and outputs a reception signal to the electric circuit on the circuit board 140. At this time, the tuner unit 360 further applies a feedback control signal corresponding to the level of the received signal or a feedback control signal corresponding to the carrier-to-noise ratio (CN ratio) to the switch 340. The switch 340 performs switching between the first antenna system and the second antenna system in accordance with the feedback control signal applied by the tuner unit 360. Switching is performed as follows, for example. The switch 340 starts switching of the antenna system when a predetermined condition is satisfied, for example, when a decrease in the level or CN ratio represented by the feedback control signal is recognized. When switching is started, the switch 340 stores the level or CN ratio represented by the feedback control signal at that time. Then, the antenna system is switched on a trial basis. When the feedback control signal corresponding to the new antenna system is applied to the switch 340 by the tuner 360 by this switching, the switch 340 compares the level or CN ratio before and after the trial switching, Switch to the antenna system with the higher CN ratio.

  As described above, by receiving a broadcast wave while switching between the first antenna system and the second antenna system, the broadcast wave can be received using an antenna system with high reception sensitivity depending on the situation. Therefore, highly sensitive reception is possible particularly in a multipath environment.

  In the present embodiment, the gain is improved by switching the first antenna system and the second antenna system by the switch 340. However, the gain can also be improved by combining the signal received by the first antenna system and the signal received by the second antenna system. In this case, portable broadcast receiving apparatus 300 includes an antenna signal combiner instead of the switch shown in FIG. Furthermore, if the combiner has a function for matching the input impedance of the first antenna system and the input impedance of the second antenna system, it is possible to ensure the band characteristics of the entire antenna system.

  As described above, by combining the reception outputs of the two antenna elements having different reception positions, the reception sensitivity can be made higher than in the case of at least one antenna. In terrestrial digital broadcasting, an OFDM (Orthogonal Frequency Division Multiplexing) system having a guard interval is employed. For this reason, the phase difference of the received signals between the two antenna systems hardly poses a problem.

[Fourth Embodiment]
In the portable broadcast receiving apparatus according to the first to third embodiments, the circuit board 140 is housed in the second casing unit 104. However, the present invention is not limited to such an embodiment. A portable broadcast receiving apparatus 400 according to a fourth embodiment described below has circuit boards in both the first casing and the second casing.

  FIG. 12 shows an appearance from the front of portable broadcast receiving apparatus 400 according to the present embodiment. FIG. 13 shows an external appearance of the portable broadcast receiving apparatus 400 from the back. Referring to FIG. 12, portable broadcast receiving apparatus 400 includes first and second housing parts 402 and 404, and first and second housing parts 402 and 404, respectively, made of flat, substantially rectangular parallelepiped insulators. A rotation unit 406 that rotatably couples the housing unit 404 to each other on one side thereof is included.

  The portable broadcast receiving apparatus 400 is further attached to the first housing unit 402, and is attached to the display unit 412 for displaying the received broadcast and the second housing unit 404, and an operation for receiving an operation by the user. Part 414 and a grip part 416 attached to the second housing part 404 and gripped by the user when using the portable broadcast receiving apparatus 400.

  Referring to FIG. 13, portable broadcast receiving device 400 further includes a camera 418 disposed on the back surface of second housing portion 404. The grip 416 is provided with a protrusion 417 that prevents slipping when the user operates the camera 418. The protrusion 417 is made of a conductor having an electric resistance lower than that of at least the second housing portion 404 and serves as an electrical contact point between the grip portion 416 and the user's body.

  FIG. 14 shows a schematic configuration inside portable broadcast receiving apparatus 400. Referring to FIG. 14, portable broadcast receiving apparatus 400 further includes antenna element 420 having a substantially polygonal shape, which is attached to the inner surface of first housing portion 402 and made of a conductor wire or a flat conductor having a width of about 1 to 3 mm. Including.

  The portable broadcast receiving apparatus 400 further includes a flexible substrate 430 that is housed in the rotation unit 406 and is similar to the flexible substrate 130 of the portable broadcast receiving apparatus 100 according to the first embodiment. A plurality of conductor lines are formed on the flexible substrate 430. Details of the conductor lines on the flexible substrate 430 will be described later with reference to FIG.

  The portable broadcast receiving apparatus 400 is further accommodated in the second casing unit 404, and is accommodated in the tuner unit 432 having the same function as the tuner unit 132 according to the first embodiment and the second casing unit 404. And a ground conductor plate 434 having the same function as that of the ground conductor plate 134 according to the first embodiment. The portable broadcast receiving apparatus 400 is further formed on the first circuit board 442 housed in the first casing unit 402 and the first circuit board 442, and various types for operating the portable broadcast receiving apparatus 400. And a ground pattern formed on the first circuit board 442 and serving as a ground conductor for the electric circuit on the first circuit board 442.

  The portable broadcast receiving device 400 is further formed on the second circuit board 440 housed in the second casing unit 404 and the second circuit board 440, and cooperates with the electric circuit on the first circuit board 442. Various electric circuits for operating the portable broadcast receiving apparatus 400 and a ground pattern formed on the second circuit board 440 and serving as a ground conductor for the electric circuit. The portable broadcast receiving apparatus 400 further includes a matching unit 444 for matching impedance between a ground pattern on the first circuit board 442 and an antenna system described later.

  The electric circuit formed on the first circuit board 442 and the second circuit board 440 is the first circuit except that the electric circuit is formed separately on the first circuit board 442 and the second circuit board 440. This is the same as the electric circuit on the circuit board 140 according to the embodiment. Therefore, detailed description thereof will be omitted.

  FIG. 15 schematically shows an electrical connection relationship of each part shown in FIGS. Referring to FIG. 15, antenna element 420 is connected to tuner unit 432 through a conductor line on flexible substrate 430 at feeding point 422. The antenna element 420 receives power from the tuner unit 432 via a conductor line on the flexible substrate 430. The tuner unit 432 is further connected to an electric circuit on the second circuit board 440. The electric circuit on the second circuit board 440 is connected to the operation unit 414 and the electric circuit on the first circuit board 442. An electric circuit on the first circuit board 442 is connected to the display portion 412. The conductor line on the flexible substrate 430, the tuner unit 432, and the ground pattern on the second circuit substrate 440 are electrically connected to the ground conductor plate 434. The ground pattern on the first circuit board 442 is connected to the ground conductor plate 434 through the matching unit 444 and the conductor line on the first flexible board 430. The ground conductor plate 434 is further connected to the tuner portion 432 and the protrusion 417 of the grip portion 416. That is, a user who touches the ground conductor plate 434, the protrusion 417 of the grip portion 416, and the protrusion 417 of the grip portion 416 connects the tuner portion 432, the electric circuit on the second circuit board 440, and the antenna system described later. It becomes a conductor.

  FIG. 16 schematically shows the configuration of the antenna system of the portable broadcast receiving apparatus 400. Referring to FIG. 16, antenna feed line 450 and antenna ground lines 452 </ b> A and 452 </ b> B are formed on flexible substrate 430. The antenna feed line 450 and the antenna ground lines 452A and 452B form a coplanar line on the flexible substrate 430, similarly to the lines 150, 152A, and 152B on the flexible substrate 130 according to the first embodiment. At least one of the antenna ground lines 452A and 452B is connected to the matching unit 444. The matching unit 444 is connected to a ground pattern on the first circuit board 442. Matching unit 444 matches the impedance between the ground pattern and the antenna ground line. Therefore, the portable broadcast receiving apparatus includes the antenna element 420, the antenna feed line 450 on the flexible substrate 430, the antenna ground lines 452A and 452B, the ground conductor plate 434, and the conductors connected to the ground conductor plate 434. 400 antenna systems are formed, and impedance is matched between the antenna system and the ground pattern on the first circuit board 442.

  In this antenna system, the antenna element 420 is connected to the tuner section 432 via the antenna feed line 450 and is spatially separated from the ground conductor plate 434 and the second circuit board 440. The antenna element 420 is impedance-matched with the ground pattern on the first circuit board 442 located on the same spatial side as the antenna element 420. Therefore, coupling or binding between the ground conductor plate 434 and the antenna element 420 is reduced. The ground conductor plate 434 is further provided on the second housing portion 402 side, and is further connected to the protrusion 417 of the grip portion 416. When the user touches the protrusion 417 of the grip portion 416, the ground conductor plate 434 and the user's body are electrically connected, and the user's body becomes a good ground conductor for the antenna element 420.

<Modification of Fourth Embodiment>
Furthermore, the strap antenna 230 according to the second embodiment may be installed in the portable broadcast receiving device 400 according to the fourth embodiment. FIG. 17 shows the appearance of a portable broadcast receiving apparatus 500 with a strap antenna 230, and FIG. 18 schematically shows the configuration of the antenna system of the portable broadcast receiving apparatus 500. Referring to FIG. 17, portable broadcast receiving device 500 is obtained by attaching strap antenna 230 according to the second embodiment to portable broadcast receiving device 400 according to the fourth embodiment shown in FIG. It is. Referring to FIG. 18, the antenna system of portable broadcast receiving apparatus 500 according to the present embodiment has the same configuration as the antenna system shown in FIG. 16 of portable broadcast receiving apparatus 400 according to the fourth embodiment. Have. The antenna system of portable broadcast receiving apparatus 500 is further connected to strap antenna 230 at feeding point 422 of antenna element 420.

[Other variations]
The strap antenna 230 in the second embodiment, the third embodiment, and the modification of the fourth embodiment is connected to an antenna element via a switch or a combiner. Also good. When connecting via a combiner, if the combiner further includes a function for matching the input impedance of the antenna element and the input impedance of the strap antenna 230, the band characteristics of the entire antenna system can be secured. .

  In the above embodiment, a ground conductor plate is attached in the second housing portion of the portable broadcast receiving apparatus, and antenna grounding is taken from the ground conductor plate. However, the present invention is not limited to such an embodiment. For example, if conductive coating is applied to the inner side of the second housing portion, the coating film may be used as a ground conductor for the antenna element. If there is a shield plate or the like, the shield plate may be used as a ground conductor for the antenna element. Further, if these are sufficiently large as a ground conductor for the antenna element 120, these conductors may be used as an alternative to the ground conductor plate. By doing so, it is not necessary to configure the ground conductor plate of the antenna, and it can be configured more simply and at low cost.

  In the embodiment described above, the ground conductor for the antenna element in the second housing portion and the user's body are electrically connected via the grip portion. However, even if the ground conductor for the antenna element in the second casing is not electrically connected to the user's body, the ground conductor can be equivalently enlarged using the user's body. For example, the second casing is formed of an insulator, and a ground conductor for the antenna element is formed on the inner surface thereof. And a holding part is provided on the outer surface near the part in which the ground conductor of the second housing part is formed. When the user grips the grip portion, the user's body and the ground conductor physically approach each other. Thereby, the coupling | bonding by an electromagnetic field arises between a grounding conductor and a user's body. As a result, the size of the ground conductor with respect to the antenna is equivalently increased, and the antenna characteristics are improved.

  In the above embodiment, the antenna element attached to the first housing part, the tuner part in the second housing part, and the ground conductor are connected by the coplanar line formed on the flexible substrate. However, the present invention is not limited to such an embodiment. For example, a coaxial cable can be used instead of the coplanar line. Also, for example, by removing the antenna grounding line from the flexible substrate, the conductor composed of the antenna feeding line and the antenna element can function as one antenna element that receives power at the contact point between the tuner section and the antenna feeding line. Can do.

  The embodiment disclosed herein is merely an example, and the present invention is not limited to the above-described embodiment. The scope of the present invention is indicated by each of the claims after taking into account the description of the detailed description of the invention, and all modifications within the meaning and scope equivalent to the wording described therein are intended. Including.

1 is an external view of a portable broadcast receiving device 100 according to a first embodiment of the present invention. 1 is a schematic diagram showing an internal configuration of a portable broadcast receiving device 100. FIG. 3 is a schematic diagram showing an electrical connection relationship of each part of the portable broadcast receiving apparatus 100. FIG. 2 is a schematic diagram showing a configuration of an antenna system of portable broadcast receiving device 100. FIG. 3 is a diagram showing a positional relationship between an antenna element 120 and a ground conductor plate 134 when the portable broadcast receiving apparatus 100 is used. FIG. It is a figure which shows the shape of the antenna element which concerns on the modification of 1st Embodiment. It is an external view of the portable broadcast receiver 220 which concerns on the 2nd Embodiment of this invention. 3 is a schematic diagram showing a configuration of an antenna system of portable broadcast receiving apparatus 220. FIG. It is an external view of the portable broadcast receiver 300 which concerns on the 3rd Embodiment of this invention. 2 is a diagram showing an internal configuration of a portable broadcast receiving apparatus 300. FIG. 3 is a diagram schematically showing a configuration of an antenna system of a portable broadcast receiving apparatus 300. FIG. It is a figure which shows the external appearance from the front of the portable broadcast receiver 400 which concerns on the 4th Embodiment of this invention. It is a figure which shows the external appearance from the back surface of the portable broadcast receiver. 3 is a schematic diagram showing an internal configuration of a portable broadcast receiving device 400. FIG. 4 is a schematic diagram showing an electrical connection relationship of each part of portable broadcast receiving device 400. FIG. 3 is a diagram schematically showing a configuration of an antenna system of a portable broadcast receiving apparatus 400. FIG. 1 is an external view of a portable broadcast receiving device 500 with a strap antenna 230. FIG. It is a figure which shows typically the structure of the antenna system of the portable broadcast receiver. It is a figure which shows the external appearance of the conventional common portable TV receiver.

Explanation of symbols

100, 220, 300, 400, 500 Portable broadcast receiver, 102, 402 First housing part, 104, 404 Second housing part, 106, 406 Rotating part, 112, 412 Display part, 114, 414 Operation Part, 116, 416 grip part, 120, 170, 180, 190, 200, 420 antenna element, 130, 430 flexible substrate, 132, 360, 432 tuner part, 134, 334, 434 ground conductor plate, 140, 440, 442 Circuit board, 150, 450 antenna feed line, 152A, 152B, 452A, 452B antenna ground line, 230 strap antenna, 310 earphone antenna, 312 earphone terminal, 320 first cable, 322 earphone feed terminal, 324A second cable, 324B second 3 cables, 3 6A, 326B earphone, 340 switch, 370 a ground portion, 372 power supply portion, 417 projection, 418 camera, 444 matcher

Claims (19)

A first housing;
A second housing;
A rotating portion provided to connect the first casing and the second casing to each other so as to be rotatable;
An antenna element attached to the first housing;
A feed line connected to the antenna element;
A grounding conductor for the antenna element attached to the second housing;
A wireless circuit attached to the second housing and connected to the antenna element via the feeder line;
Provided in the second housing, said first housing, said second housing, and viewed including a grip portion held by the user in order to support the rotating unit,
The gripping part is
A gripping member provided in the second housing and gripped by a user to support the first housing, the second housing, and the rotating unit;
A projecting member made of a conductor, which is formed on the second casing so as to be easily gripped by the user when the user grips the gripping member, and is electrically connected to a ground conductor for the antenna element; Including
The second casing has a predetermined electrical resistance,
The projecting member is a portable wireless device having an electrical resistance lower than the predetermined electrical resistance . The rotating unit is configured such that the first casing and the second casing rotate with respect to each other about the rotating unit, and an arbitrary range within a predetermined range centered on the rotating unit. And means for connecting the first housing and the second housing such that an angle between the first housing and the second housing is maintained at an angle. 2. The portable wireless device according to 1. The first casing is maintained at a position that forms an arbitrary angle within the range of 180 degrees or more and less than 360 degrees with the second casing by the means for connecting, so that the second casing The portable wireless device according to claim 2, wherein the portable wireless device functions as a stand. Each of the first housing and the second housing has a main surface,
The portable wireless device further includes a display unit provided on the main surface of the second casing,
The rotating unit includes a first position where the main surface of the first casing overlaps the main surface of the second casing, the main surface of the first casing, and the second Means for connecting the first casing and the second casing to be rotatable about a predetermined axis between a second position where the main surface of the casing forms a predetermined angle. And thereby
2. The portable wireless device according to claim 1, wherein, in the first position, the first casing functions as a lid for the display unit of the second casing. The portable radio apparatus according to claim 1, further comprising an antenna ground line provided substantially parallel to the feed line via a predetermined dielectric and electrically connected to the ground conductor. Furthermore, including a circuit board provided in the second housing,
The portable wireless device according to claim 1, wherein the ground conductor for the antenna element includes a ground pattern formed on the circuit board. The portable radio apparatus according to claim 1, wherein the antenna element includes a linear antenna element having a predetermined shape made of a linear conductor having a predetermined length. The portable wireless device according to claim 7 , wherein the line antenna element has a shape bent at one or a plurality of locations. The portable wireless device according to claim 7 , wherein the predetermined shape includes a spiral shape. The portable radio apparatus according to claim 1, wherein the antenna element is formed of a plate-shaped conductor having a predetermined shape. The portable radio apparatus according to claim 1, wherein the antenna element is formed of a loop-shaped conductor having a predetermined shape. The feed line is a position on the antenna element in a state where the antenna element is attached to the first housing, and the position where the distance from the rotating portion is the shortest, The portable wireless device according to claim 1, wherein the portable wireless device is electrically connected. The portable wireless device according to claim 1, further comprising a connector for electrically connecting the antenna element and a predetermined external antenna element. Further, the predetermined external antenna element connected to the antenna element via the connector,
The portable wireless device according to claim 13 , wherein the external antenna element includes a strap-like antenna element. Furthermore, it looks including the predetermined external antenna element connected to the antenna element via the connector,
The portable wireless device according to claim 13 , wherein the external antenna element includes a predetermined earphone antenna element. The portable wireless device according to claim 13 , wherein the connector includes means for electrically directly connecting the antenna element and the external antenna element. The portable wireless device according to claim 13 , wherein the connector includes a combiner for combining a signal generated by the antenna element and a signal generated by the external antenna element. The connector, in response to the predetermined control signal is applied, with respect to the feed line, comprising a switch for selectively connecting said antenna element and said external antenna element, to claim 13 The portable wireless device described. The wireless circuit generates the predetermined control signal according to the characteristics of the signal given from the switch,
19. The portable radio apparatus according to claim 18 , wherein the switch includes means for selectively connecting the antenna element and the external antenna element to the feed line in response to the control signal. .

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