JP4166194B2 - Mobile broadcast receiving terminal device - Google Patents

Description

The present invention relates to a mobile broadcast receiving terminal device. More specifically, the present invention is provided as a mobile terminal device that allows a user to view without degrading the receiving performance due to the surrounding environment such as a shielding object under any use conditions. The present invention relates to a mobile broadcast receiving terminal device.
The present invention also relates to a mobile broadcast receiving terminal device having a double hinge structure in which the reception capability of the antenna is prevented from being lowered due to static electricity entered through the key operation of the user who operates, and the reception state is always good.

[Overview]
Mobile broadcasting is multimedia digital broadcasting for mobiles using a dedicated geostationary satellite provided by Mobile Broadcasting Co., Ltd. (MBCO, http://www.mbco.co.jp/). This satellite digital broadcasting covers the entire country of Japan with a single broadcast wave and provides services mainly for individuals. A mobile broadcasting satellite called “MBSAT” with a business license was launched in the direction of 144 degrees east longitude, and for a while after the satellite's orbit correction and radio wave test were performed, a paid official service is scheduled to start.

[How mobile broadcasting works]
The main feature of mobile broadcasting is the geostationary satellite MBSAT. This MBSAT receives Ku-band (14 GHz band) radio waves from the mobile broadcasting center on the ground, converts the frequency and amplifies the power, and then broadcasts the S-band (2.6 GHz band) radio waves across Japan with a large antenna. Do.

  In the digital satellite broadcasting described above, almost all areas on the ground can be covered with radio waves from the satellite. However, a re-transmission facility called a gap filler will be installed in urban areas where satellite radio waves do not reach, in highway tunnels, etc., to realize a “1-kilometer radius service”. The gap filler emits radio waves of the same frequency as the satellite and provides services to places where satellite radio waves do not reach.

  In BS / CS broadcasting, it is well established that “parabolic antennas are necessary for satellite broadcasting”. However, mobile broadcasting is different. In mobile broadcasting, a receiver that receives a broadcast on the ground does not need a parabolic antenna due to a high-power broadcast wave from MBSAT, and can receive even a small omnidirectional antenna. In addition, the broadcast reception may be either radio waves from MBSAT or a gap filler installed on the ground.

Mobile broadcasting is equipped with transmission side error correction code addition and interleaving in order to obtain stability on the reception side. In addition, since all satellite radio waves, gap filler radio waves, and their reflected waves can be collected and received, even a short tunnel where radio waves are interrupted can be handled without problems for up to 1.3 seconds. Thereby, it is possible to stably receive even at high speeds such as cars and trains.
On the other hand, mobile broadcasting is close to a wireless LAN (IEEE802.11a) having a frequency of 2.4 GHz, so it is considered that broadcast radio waves can be received indoors in a wooden building. In addition, it is only necessary to provide a personal relay device in a room such as a concrete building where reception is not possible.

  The broadcast video received by the receiver is displayed on an MPEG-4 QVGA screen (320 × 240 dots, frame rate of 15 fps), with a PDA or car navigation screen size (7 inches). Also, since the same MPEG-2 AAC as BS digital broadcasting is used for the sound, a clear sound can be heard. Since mobile broadcasting originally has the purpose of viewing on a moving body such as a train / car or outdoors, it is not suitable for viewing on a large screen at home. This broadcast has about 70 channels, and all programs (channels) are operated by one company of MBCO.

The mobile broadcast is a pay broadcast and is limited to each device, and cannot be viewed unless a contract is made. On the other hand, a receiving terminal device for mobile broadcast is manufactured by each manufacturer.
In mobile broadcasting, the broadcasting satellite MBSAT is jointly operated and broadcast radio waves are sent to South Korea in the same manner. Of course, the broadcast radio waves sent to this satellite from the Korean broadcasting center are relayed and sent to Korea.

[Differences from digital terrestrial broadcasting for mobile]
“One-segment broadcasting service for mobile users” that can be viewed outdoors using one segment of digital terrestrial television broadcasting along with mobile broadcasting services.
In both cases, a “dedicated receiver”, a “terminal with a dedicated reception tuner such as a PDA or a mobile phone”, a “tuner attached to an in-vehicle GPS / audio, etc.” are required for reception. These products will appear separately in the mobile broadcast receiver market. The difference will be described below.

  First, as a system difference, mobile broadcasting has a wide service area, and mobile broadcasting can be viewed anywhere in Japan. In addition, since mobile broadcasting is performed from its own dedicated broadcasting satellite “MBSAT”, the entire country of Japan becomes a service area where the same program can be viewed simultaneously. Here, gap fillers are being installed in places where radio waves do not reach, such as in the shadows of urban buildings, in tunnels and underground, and the reception area is being expanded by eliminating the unintelligible zone where reception is not possible. At least the range where the sky in the satellite direction can be seen is the reception area, so it can be viewed even in tall buildings, lakes, mountains, and the seas near Japan. Also, the tens of kilometers from the broadcasting station is not the reception area, and you can watch your favorite professional channel without changing the channel.

  Next, the difference in reception is that reception of mobile broadcast radio waves is not easily affected by multipath and has a RAKE reception function that collects radio waves. Can receive. In addition to expanding the reception area due to the gap filler, the interleave memory of the receiver and the function of eliminating the Doppler shift that adversely affects high-speed driving reception enable stable reception even in trains and in vehicles running on highways. That is also possible with a small antenna.

Lastly, although it is a business relationship, in mobile broadcasting, the entire 25 MHz bandwidth of 2.6 GHz broadcast radio waves in the S band is allocated to one MBCO company. The public and private terrestrial digital broadcasting (UHF band 13CH to 52CH) is a set of broadcasting companies (NHK, NTV, TBS, etc.), and the business form is different.
In other words, MBCO will produce programs for all mobile broadcast channels or procure domestic and foreign broadcasts and broadcast specialized programs. Therefore, there is no similar program on multiple channels.

  Mobile broadcasting is not limited to subscribers like a CAS card, but is paid broadcasting with limited terminals. As for the broadcast video compression system, the adoption of MPEG4 has already been decided. Unlike terrestrial digital broadcasting, the specifications of mobile broadcast receiving terminals are fixed, and whether or not to launch the terminals will depend solely on the product planning of the manufacturer.

[Mobile broadcast content]
In mobile broadcasting, since all channels have programming rights in MBCO, content can be set freely. At present, it is likely that there will be 55 channels dedicated to music audio programs, 7 channels for programs containing simple video images, and 3 channels for data broadcasting services. The program is a specialized channel for each genre.

The program with simple video 512Kbps has a comprehensive channel, news, economy, sports, music, and a special channel for kids anime for children. Also, special programs such as weekday / weekend special programs and day / night special programs are being planned.
As for the audio music program, 40 channels are made a 24-hour music program. Music is broadcast at 48 Kbps, divided into dedicated channels in major categories such as POP, ROCK, Enka, JAZZ, Easy Listening and Kids Songs. In the audio system, there are simulcasts from US and Japanese FM stations, news programs from Japan and overseas (general news, sports news, economic news), and English and Chinese specialized channels for foreign language learning.

  Data broadcasting is a format in which information updated about three times a day is automatically broadcast, received and stored by a terminal, and viewed from a menu screen when necessary. The contents are assumed not to be linked to the program but to be operated by independent things such as weather forecasts and fortune-telling. Data broadcasting is divided into sub-channels, and it seems that about 30 channels are installed.

[the next deployment]
Mobile broadcasting satellite "MBSAT" was launched at the end of January 2004, and after the start of this service, it is verified by marketing whether the program content meets the needs, and unpopular programs are abolished and reorganized to new programs. Two-way communication and engineering streams that automatically update programs in the terminal are also being considered as future business plans.

  Regarding receiving terminals for users, portable TV receiving terminals and in-vehicle tuners appear to appear from various manufacturers in conjunction with the start of this service in the summer of 2004. Around the beginning of 2005, when a new small-sized LSI for reception was completed, product development began by manufacturers such as mobile phones with built-in reception tuners, PDAs, and PC card-type reception tuners. These products appeared in 2005 It seems to be. Car-mounted terminals are expected to be sold in a state of being built into automobiles as a manufacturer's genuine product, as well as built-in types such as tuner type to car navigation system. In addition, it seems that a composite receiving terminal device incorporating a tuner will appear.

Mobile broadcasting uses a satellite broadcasting system that uses the same satellite in both Japan and Korea, but even in China that is currently experimenting, if this same system is adopted, the receiving performance of the receiving terminal and Cost reduction is expected along with functional improvement.
Even in Japan, mobile broadcasting is expected to be a disaster prevention media in the event of a disaster, taking advantage of the characteristics of a receiving terminal that can be received and carried with images outdoors in the country.

  As described above, mobile broadcast radio wave reception is not easily affected by multipath, and has a RAKE reception function that collects radio waves, so in principle it can be received stably regardless of whether the receiver is horizontal or upside down. Although it is configured, in reality, a radio wave in the 2.6 GHz band has a property close to that of light and causes a problem that reception performance deteriorates due to a surrounding environment, for example, a shield such as a human body / wall.

  Because of these problems, when a user watches a broadcast wave of a mobile broadcast, the user has the terminal in a usage situation where the user has a broadcast receiving terminal that has excellent portability and can be viewed anytime and anywhere. As a result, the reception performance is degraded. In this case, even if it is a portable terminal that places importance on portability, the product concept may be partially denied.

  In addition, as a viewing state of the mobile broadcast receiving terminal device described above, the device main body is laid down sideways, and only the display unit coupled thereto via a hinge is rotated with respect to the main body. It is also possible to watch in a stationary state without holding the main body by waking up, but in this state also the antenna position or directivity and the viewing position relationship of the user or the antenna position or directivity and the display unit Depending on the viewing position relationship, a means for solving the radio wave interference due to the above-described shielding object is required.

  For example, in Patent Document 1, the loop surface of a loop-shaped conductor used as an antenna element is set to be substantially parallel to a ground plate of a portable wireless device, and the portable wireless device is used in the vicinity of a human body. An antenna device is disclosed in which a loop-shaped conductor is arranged on the opposite side of the human body, and it is described that this antenna device improves the performance during a call with a human body with a simple configuration that does not require a matching circuit. ing.

However, the antenna device disclosed in Patent Document 1 does not disclose a portable terminal in which a display unit having a rotation mechanism using a hinge is rotatable, and an antenna position or directivity changed by the hinge mechanism and a viewing position of the display unit. The means for solving the radio interference caused by the shielding according to the relationship was not considered at all.
Japanese Patent Laid-Open No. 2001-230613

SUMMARY OF THE INVENTION In view of the above, an object of the present invention is to provide a mobile broadcast receiving terminal device that can be viewed under any use conditions without deteriorating the reception performance due to the surrounding environment such as a shield.
Furthermore, even if the user views the mobile broadcast receiving terminal device according to the present invention without holding it in his / her hand, the user can receive the mobile broadcast receiving terminal device without reducing the reception performance due to the surrounding environment such as a shield. Alternatively, it is an object to provide a portable broadcast receiving apparatus that can maintain a viewing state.

The first technical means includes a display unit having a display screen on at least one side, a main unit having at least an antenna for receiving a broadcast signal, a channel selection unit, a signal processing unit, and an operation unit, a display unit and a main unit A coupling portion that couples to the main body portion, a first hinge that rotates about the first axis with respect to the main body portion, and a display portion that is coupled to the display portion. And a second hinge that rotates about the second axis, and the first hinge allows the display unit to be folded or opened with respect to the main body. , A mobile broadcast receiving terminal that is rotated about the second axis with respect to the display screen of the display unit parallel to the second axis by the second hinge, wherein the antenna is connected to the display unit together positioned above the display unit in the folded state to the main body portion, up to a specific direction The specific direction that has the directivity with the reception sensitivity and maximizes the reception sensitivity is relative to the direction vector formed from the back side of the normal direction of the back side of the housing of the main unit toward the front side of the main unit. , And arranged in a state inclined by a predetermined angle of less than 90 ° .

The second technical means is the first technical means characterized in that the predetermined angle is 45 °.

According to a third technical means, in the first technical means, a latch mechanism is provided for locking the display unit to the main body when the display unit is folded, and the display screen of the display unit is the main body. The display unit can be locked to the main unit in either the state facing the unit or the display surface in the direction opposite to the main unit, and the display screen is directed in the direction opposite to the main unit. When the display unit is folded into the main body in the state of being in a state, a gap with a predetermined interval is formed between the display unit and the main body.

According to a fourth technical means, in the first technical means, as antennas, two antennas are arranged on both upper side portions of the main body portion with a predetermined interval equal to or more than 1/4 wavelength of the reception frequency. An exhaust port and / or a fan is disposed between the two antennas.

The fifth technical means is the first or third technical means, wherein the display unit is provided with a switch for determining whether or not power supply to the display unit is necessary in a state where the display unit is folded in the main body unit, The switch can be pressed in the vertical direction with respect to the display screen of the display unit, and when the display unit is folded in the main body with the display screen facing in the opposite direction to the main body, The switch is pressed by the display unit, and power supply to the display unit is stopped according to the press operation.

According to the present invention, it is possible to provide a mobile broadcast receiving terminal device that allows a user to view without any deterioration in reception performance due to a surrounding environment such as a shielding object under any use condition.
Furthermore, according to the present invention, even if the user views the mobile broadcast receiving terminal device according to the present invention while standing still without holding it, the reception performance is degraded by the surrounding environment such as a shielding object. It is possible to provide a portable broadcast receiving apparatus that can maintain a reception or viewing state without any problems.

  Hereinafter, an embodiment of a mobile broadcast receiving terminal device of the present invention will be described in detail with reference to the accompanying drawings. In all the drawings for explaining the embodiments, FIG. 1 is a diagram showing an embodiment of a mobile broadcast receiving terminal device according to the present invention, and shows a schematic configuration of the mobile broadcast receiving terminal device viewed from below. 1 (A) shows a schematic configuration viewed from the front, and FIG. 1 (C) shows a schematic configuration viewed from the side. In FIG. 1, 1 is a main body part, 2 is a display part, 3 is a coupling part, 11 is an antenna, 12 is an operation part, 14 is an exhaust port, 15 is a fan, 16 is a battery, 1a is a rear surface of the main body part housing, 1b is a front surface of the main body housing, R is a storage area of the display unit, and T is an interval between antennas.

  The mobile broadcast receiving terminal device receives the broadcast signal received from the mobile broadcast satellite “MBSAT”, extracts video information to be displayed on the screen or audio information to be output to the speaker from this received signal, and performs signal processing. And a display unit 2 (for example, a thin display element such as a liquid crystal panel or an organic EL) that displays the received video information on the screen by the predetermined process. Have). The main body unit 1 and the display unit 2 are coupled by a coupling unit 3 including two hinges (first hinge and second hinge), and the display unit is connected to the main body unit 1 using these two hinges. By rotating 2, each arrangement relationship can be freely set.

  The main body 1 has a storage area (R: FIG. 1) in which a concave shape is formed in a thickness direction in a part thereof so that the display section 2 can be stored. Can be stored. As a result, the mobile broadcast receiving terminal device as a whole is prevented from having a discontinuous thickness.

  In addition, the main body 1 performs various operations (CH switching, reserved recording, etc.) that can be realized by the antenna 11 for receiving the broadcast signal received from the mobile broadcast satellite “MBSAT” and the mobile broadcast receiving terminal device. The operation unit 12 is provided. The operation unit 12 is located in the main body unit 1 below the storage region R that is the storage position of the display unit 2, and the hand that is operated even when the user picks up the hand and operates it is the viewing of the display unit 2. Arranged so as not to disturb. Hereinafter, the expressions “upper side” and “lower side” are used for the main body 1 and follow the directions indicated by the arrows in FIG.

FIG. 2 is a diagram illustrating a configuration of the operation unit 12 of the mobile broadcast receiving terminal device. The operation unit 12 is provided with various operation keys as follows.
(1) Menu key 121: A key for displaying a menu screen and a cursor for designating each item.
(2) Direction instruction key 122: A key for moving the cursor in the vertical and horizontal directions when the menu screen is displayed.
(3) Enter key 123: A key for selecting the menu item where the cursor is located.

(4) Card playback key 124: A key for playing back video or audio information recorded on a memory card inserted into a memory card slot provided in the main unit 1. When the direction instruction key 122 is operated during card reproduction, “pause”, “stop”, “fast reverse”, and “fast forward” operations can be performed, respectively.
(5) Return key 125: A key for returning various setting states previously selected by the menu key to the original state.
(6) Accumulated data key 126: A key for displaying a list of accumulated data stored in the memory built in the main unit 1 by an operation such as reserved recording.
(7) Record key 127: An operation key for recording image or sound information to be recorded in the memory.
(8) Channel selection up / down key 128: A key for performing channel selection by sequentially performing an up / down operation on channels assigned to select a channel to be viewed.

  In addition to the above-described various keys, a light-emitting element (such as an LED) indicating whether or not a reservation / recording process has been executed, or a state of the main body whether or not a power source is input or whether or not charging is in progress is displayed. It is possible to arrange the light emitting element or the like so that the user can recognize the light emitting state.

FIG. 3 is a schematic perspective configuration diagram for explaining the configuration of the coupling portion 3 in more detail. In FIG. 3, 31 is a first hinge, and 32 is a second hinge. 4 is a perspective view showing the mobile broadcast receiving terminal device when the display unit 2 is in the screen storage state, and FIG. 5 is a mobile type when the display unit 2 is in the installation state (first viewing state). It is a perspective view which shows a broadcast receiving terminal device. In FIG. 5, reference numeral 21 denotes a display screen provided in the display unit 2.

As shown in FIG. 3, the coupling portion 3 includes a first hinge 31 and a second hinge 32, and the first hinge 31 has a rotation axis X that can rotate between the main body portion 1. The display unit 2 can be opened and closed by this rotation operation. As a result, the display unit 2 can be stored in the main unit 1 with the display screen 21 facing the main unit 1 as shown in FIG. 4 (the state shown in FIG. 4 is referred to as a screen storage state).

  On the other hand, the second hinge 32 constitutes a rotation axis Y that can be rotated with the display unit 2. When the direction of the axis of the rotation axis Y is on the middle line C (thick broken line) passing through the center of the screen, the orientation of the display screen 21 of the display unit 2 can be adjusted by the rotation operation with the rotation axis Y. it can. As a result, as shown in FIG. 5, the display screen 21 of the display unit 2 can be in a state of facing the user through the operation unit 12. Can be performed while viewing an operation on the display video state such as CH selection at the same time as viewing (the state of FIG. 5 is set as the first viewing state).

FIG. 6 is a perspective view showing the mobile broadcast receiving terminal device when the display unit 2 is in another installation state (second viewing state).
In the state where the display screen 21 is rotated as in the first viewing state, the display unit 2 is again stored in the storage region R using the first hinge, as shown in FIG. Thus, it is possible to form a state where the video can be viewed while the display unit 2 is housed (the state shown in FIG. 6 is set as the second viewing state).
By the way, the heat radiation from the object has a higher heat radiation efficiency as the temperature of the heat radiation portion is higher. However, the portion that the user can easily touch cannot be unnecessarily high. However, the site | part of the main-body part 1 facing the display part 2 concerning this invention becomes a site | part which a user does not touch easily in normal operation by taking a double hinge structure. For this reason, it becomes possible to arrange | position the component or heat sink which becomes comparatively high temperature in this part, and can raise the fruit of heat dissipation, without impairing a user's convenience.

  Then, in any of these two viewing states, the antenna 11 is placed in the storage area R as shown in FIG. It is arranged on the upper side. More specifically, in the main body 1, a space for incorporating the antenna 11 is provided at a position further above the storage area R for storing the display unit 2, and the antenna 11 is stored here. Deploy. By disposing the antenna 11 at this position, it is possible to always obtain good reception sensitivity without the antenna 11 being shielded by the peripheral display unit 2 or other devices. In the present embodiment, a diversity method using two antennas is adopted in order to further improve the reception performance, and these two antennas are individually arranged on both upper side portions of the main body 1.

  FIG. 7 is a diagram illustrating an example of vertical plane directivity characteristics in free space of a patch antenna that can be used as the antenna 11 in the present invention. The patch antenna includes a ground substrate, a dielectric substrate, a radiating element, a metal patch, and the like disposed on the antenna substrate, and has a substantially flat plate shape or a disk shape as shown in FIG. As shown in FIG. 7, in the distribution of the plane perpendicular to the substrate surface of the antenna substrate, there is a directional distribution with the maximum receiving sensitivity in a specific direction (near 0 ° in the example of FIG. 7). is doing.

  When this patch antenna is arranged as the antenna 11, since the mobile broadcast satellite MBSAT is launched 144 degrees above east longitude, the satellite is tilted approximately obliquely (around 45 degrees) with respect to the user's standing direction. Considering that, the reception performance of the antenna 11 should be made as independent of the user's orientation with respect to the satellite as much as possible. In particular, a scene in which a user moves while viewing a mobile broadcast receiving terminal device is a scene that frequently occurs as a mobile broadcast usage scene. You must consider it. In addition, when a user views while holding the mobile broadcast receiving terminal device, the user often tilts and tilts approximately 45 °.

  Therefore, even when the user turns while the main body 1 is inclined, the maximum reception sensitivity of the antenna 11 is set so that the radio wave sensitivity of the mobile broadcast satellite MBSAT can always be received without changing. The specific direction to be obtained is configured to be inclined by a predetermined angle. Specifically, as shown in FIG. 1, the specific direction in which the reception sensitivity of the antenna 11 is maximum is from the back surface 1a side of the housing to the front surface 1b in the normal direction of the back surface 1a of the housing of the main body 1. The direction vector is arranged in a state inclined by a predetermined angle of less than 90 ° (for example, 45 °) with respect to the direction vector formed.

  As a result, it is possible to maintain a stable antenna reception state as much as possible regardless of the position of the user with respect to the satellite while holding the mobile broadcast receiving terminal device obliquely. At the same time, even in the state where the main body unit 1 is disposed horizontally and the display unit 2 is rotated by the first hinge 31 to raise the display screen 21 as in the first viewing state described above, the antenna Since the substrate surface of the antenna substrate of the (patch antenna) 11 is inclined at a certain angle (for example, 45 °) with respect to the vertical direction, an optimum direction is searched for the position of the satellite, and the second hinge 32 is found in that state. By rotating the display unit 2 to adjust the rotation of the display unit 2, the user can view in an optimal reception state.

  With the arrangement configuration of the antenna 11 as described above, it is possible to arrange the antenna 11 at a portion where the directivity of the antenna 11 is least affected. For example, the display unit 2 is rotated using the second hinge 32. Even in this case, there is no influence in any viewing state. In addition, since the antenna 11 can be arranged as far as possible from the double hinge of the coupling unit 3, the antenna 11 can be arranged at a position where it does not become a shadow of the display unit 2, and a reduction in sensitivity can be prevented. .

  In the above embodiment, a patch antenna suitable for light weight and size reduction is used as the antenna 11. However, the present invention is not limited to this. For example, a helical antenna or a planar antenna may be used. It is only necessary that the specific direction with strong reception characteristics is arranged to be inclined at a certain angle (for example, 45 °) with respect to the display screen 21 in the screen storage state.

[Exhaust vent]
In the mobile broadcast receiving terminal device according to the present invention, the exhaust port 14 and / or the fan 15 are provided in consideration of the thermal environment due to various drive circuits. The exhaust port 14 and / or the fan 15 is provided between the two antennas 11 provided on the upper part of the main body 1 and on both sides. With this configuration, not only can the natural heat be exhausted by the chimney effect, but also the necessary inter-antenna spacing T required for the diversity antenna 11 (FIG. 1: for example, when using a reception frequency band of 2.6 GHz band, the reception frequency The fan 14 and / or the exhaust port 15 are provided in the space generated by the inter-antenna spacing T while ensuring a quarter wavelength (interval of about 2.8 cm) or more). Accordingly, the antenna and the heat dissipation mechanism can be arranged and formed without waste even in a mobile broadcast receiving terminal device to which only space is given.

  The fan 15 does not always need to rotate at all times, and the necessity of rotation and the number of rotations are appropriately controlled by a signal from a temperature sensor (thermistor). As a result, an effect of reducing the power consumption of the entire set can be obtained.

[Battery and operation unit layout]
The battery 16 is arranged so that the center of gravity of the battery 16 comes to the front side of the hand when the mobile broadcast receiving terminal device is held. As a result, the battery 16 is disposed on the side opposite to the antenna 11. Thereby, even when the display unit 2 is rotated, the operation can be easily performed.
Moreover, the operation part 12 is arrange | positioned under the main-body part 1, and the light operativity is enabled by bringing to the place which does not affect the hinges 31 and 32 of the coupling | bond part 3. FIG.

Next, another embodiment of the mobile broadcast receiving terminal device according to the present invention will be described with reference to the drawings.
[About latch]
FIG. 8 is a schematic configuration diagram of a side cross section showing another embodiment of the mobile broadcast receiving terminal device according to the present invention, and is a diagram for explaining a means for locking the display unit 2 to the main body unit 1. 8A is a diagram showing the above-described screen storage state (FIG. 4), and FIG. 8B is a diagram showing the above-mentioned second viewing state (FIG. 6). A claw part, 17 is a switch, 18 is a diffusion plate shield, 22 is an upper side part of the display part, and 221 is a concave part.
In the second viewing state (FIG. 8B), a latch mechanism is configured between the display unit 2 and the main body unit 1 in order to maintain the state in which the display unit 2 is stored in the storage region R. Yes. In the latch mechanism, the main body 1 holds the display unit 2 in both the screen storage state where the display unit 2 is stored in the storage region R of the main body 1 and the second viewing state. In order to make it possible, the following configuration is provided.

  In the screen storage state in which the display unit 2 is stored in the main body unit 1 (FIG. 8A), the upper side 22 of the display unit 2 is formed in a substantially point-symmetric shape with respect to the rotation axis Y of the second hinge 32. A recessed portion 221 is provided. On the other hand, the main body 1 has a claw portion 13 that gives a locking action to the recess 221 at a position facing the recess 211. The shape of the concave portion 211 may be a square shape or a round shape, but in any case, the concave portion 221 is in the screen storage state (FIG. 8A) or the second viewing state (FIG. 8B). The recess 221 only needs to have a point-symmetric shape with respect to the rotation axis Y of the second hinge 32 so as to be locked to the claw portion 13.

  With the configuration of the latch mechanism as described above, the latch is provided on the extension of the rotation axis of the second hinge 32 while the display unit 2 is reliably latched even when the casing of the display unit 2 is turned over, so that the latch can be easily operated. One configuration is sufficient, and it is not necessary to increase the width of the entire casing of the main body 1. In addition, the means for locking the main body 1 and the display 2 is not limited to the above-described configuration. For example, the hole provided in the main body 1 and the display 2 A convex portion may be formed in place of the concave portion 221. Of course, the convex portion has a substantially point-symmetrical shape with respect to the rotation axis Y by the second hinge 32 as in the case of the concave portion 221. If present, the same effect as in the second embodiment is obtained.

[Effect of taper]
The display unit 2 has a substantially wedge shape in which the thickness gradually decreases in the direction of the support shaft Y of the second hinge 32 from the coupling unit 3 toward the upper side unit 22.
As a specific example, the back surface 23 of the display unit 2 facing the display screen 21 forms a slope with a predetermined taper angle (β). Further, in the storage area R of the main body 1, a switch 17 for determining whether the display unit 2 is in the screen storage state (FIG. 4) or the second viewing state (FIG. 6) is provided with the taper angle. It is provided at a position facing the surface having By the action of the switch 17 and the substantially wedge-shaped display unit 2, the edge of the display screen 21 performs the pressing operation of the switch 17 simultaneously with the user's rotation operation for forming the screen storage state. When the switch 17 is pressed, power supply to the display unit 2 is stopped under the control of the microcomputer. Therefore, even in the recording reservation state, for example, in the screen storage state, recording is performed in the power saving mode by sending a control signal from the microcomputer to the display unit 2 for the display unit 2 to stop power feeding. It becomes possible to do.

  On the other hand, when in the second viewing state, the display unit 2 is stored by the gap formed between the back surface 23 where the taper of the display unit 2 is formed and the main body unit 1 of the storage region R. However, since the pressing operation of the switch 17 does not occur, the power supply to the display unit 2 is continued. Even in the second viewing state, it is possible to secure ventilation between the main body portions 1 facing the display portion 2 and facilitate heat dissipation. Although not shown, a hole through which air for heat dissipation flows can be provided in the portion of the main body portion 1 facing the display portion 2. In addition, the heat radiation hole portion is arranged in advance in a portion where the rotation locus of the display unit 2 by the second hinge 32 is in contact with the main body portion 1, so that the design of the heat radiation hole can be easily damaged. It also has an effect that makes it unclear. Furthermore, the heat conduction between the display unit 2 and the main unit 1 is blocked by the gap between the display unit 2 and the main body unit 1 to provide a thin broadcast receiving terminal device and a design that fully considers the thermal environment. It becomes possible to do.

[U-shaped shield and heat diffusion plate]
In the mobile broadcast receiving terminal device, although the exhaust port 14 and the fan 15 are provided in the main body 1, the internal temperature is averaged so as to avoid a state in which a specific part inside the device becomes hot. There is a need. Therefore, in this embodiment, as shown in FIG. 8, a U-shaped diffusion plate shield 18 is provided. The U-shaped shield 18 is formed of a U-shaped heat radiation plate + sheet and determines the air flow to form a structure like an exhaust duct. The above sheet is also effective for EMI countermeasures.

  Originally, considering heat dissipation, higher performance can be obtained when the cabinet covering the entire apparatus is made of a metal material. However, since the mobile broadcast receiving terminal device is a broadcast receiving terminal device, the antenna 11 is built in. Therefore, a metal cabinet that may have an adverse effect to block the broadcast wave to be received by the antenna 11 is not used. There is a problem that it cannot be used, and a resin cabinet is used.

  Further, ferrite beads can be inserted in the wiring to the motor used for the fan 15 to prevent a 2.6 GHz signal from jumping into the antenna. In order to increase the gain of the antenna, GND is widened and a thermal diffusion plate is also used as GND.

It is a figure which shows one Embodiment of the mobile broadcast receiving terminal device by this invention. It is a figure which shows the structural example of the operation part of a mobile broadcast receiving terminal device. It is a perspective schematic block diagram for demonstrating in detail the structure of a coupling | bond part. It is a perspective view which shows a mobile broadcast receiving terminal device when a display part is in a screen accommodation state. It is a perspective view which shows a mobile broadcast receiving terminal device when a display part is in an installation state (1st viewing state). It is a perspective view which shows a mobile broadcast receiving terminal device when a display part is in another installation state (2nd viewing-and-listening state). It is a figure which shows an example of the vertical surface directivity characteristic in the free space of the patch antenna which can be used as an antenna in this invention. It is a schematic block diagram of the side cross section which shows other embodiment of the mobile broadcast receiving terminal device by this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Main body part, 1a ... Rear surface of main body part housing, 1b ... Front face of main body part housing, 2 ... Display part, 3 ... Coupling part, 11 ... Antenna, 12 ... Operation part, 13 ... Claw part, 14 ... Exhaust Mouth, 15 ... Fan, 16 ... Battery, 17 ... Switch, 18 ... Diffusion plate shield, 21 ... Display screen, 22 ... Upper side of the display unit, 23 ... Back of the display unit, 221 ... Recess, R ... Storage of the display unit Area, T ... inter-antenna spacing.

Claims (5)

A display unit having a display screen on at least one side;
A main body having at least an antenna for receiving a broadcast signal, a channel selection unit, a signal processing unit, and an operation unit;
A coupling unit that couples the display unit and the main body unit;
The coupling portion is coupled to the main body portion, and is coupled to the display portion and a first hinge that rotates about the first axis with respect to the main body portion, and a second hinge relative to the display portion. A second hinge that pivots about an axis;
By the first hinge, the display unit is rotated with respect to the main body unit in a folded state or an open state,
A mobile broadcast receiving terminal that is rotated about the second axis with respect to the display screen of the display section parallel to the second axis by the second hinge,
The antenna is located above the display unit in a state where the display unit is folded into the main body unit ,
Directivity with maximum receiving sensitivity in a specific direction,
The specific direction in which the reception sensitivity is maximized is a predetermined direction less than 90 ° with respect to a direction vector formed from the back side in the normal direction of the back side of the housing of the main body unit toward the front side of the main body unit. A mobile broadcast receiving terminal device, wherein the mobile broadcast receiving terminal device is arranged in a state inclined by an angle . 2. The mobile broadcast receiving terminal device according to claim 1, wherein the predetermined angle is 45 [deg .]. The mobile broadcast receiving terminal device according to claim 1 ,
In a state in which the display unit is folded, a latch mechanism for locking the display unit to the main body unit is provided,
The latch mechanism is configured such that the display unit is placed on the main body in both the state in which the display screen of the display unit faces the main body and the state in which the display surface faces in a direction opposite to the main body. It is configured to be lockable,
When the display unit is folded into the main body with the display screen facing away from the main body, a predetermined gap is formed between the display and the main body. A mobile broadcast receiving terminal device. The mobile broadcast receiving terminal device according to claim 1,
As the antennas, two antennas are arranged on both upper side portions of the main body with a predetermined interval of 1/4 wavelength or more of the reception frequency,
A mobile broadcast receiving terminal device, wherein an exhaust port and / or a fan is disposed between the two antennas . In the mobile broadcast receiving terminal device according to claim 1 or 3 ,
The display unit is provided with a switch for determining whether or not power supply to the display unit is necessary in a state where the display unit is folded in the main body unit,
The switch enables a pressing operation in a direction perpendicular to the display screen of the display unit,
When the display unit is folded into the main body in a state where the display screen of the display unit faces in a direction opposite to the main body, the switch is pressed by the display, and the pressing operation is performed. Accordingly, power supply to the display unit is stopped according to the mobile broadcast receiving terminal device.

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