JP6534579B2 - Multimedia terminal unit - Google Patents

Description

  The present invention relates to a multimedia terminal unit embedded in a wall and capable of connecting to various networks.

  In the background of the information-oriented society, multimedia terminal units have been developed which allow connection with various networks. For example, in the multimedia terminal unit, a WAN cable connector for connecting to a wide area network (WAN), a LAN cable connector for wired connection to a local area network (LAN), an antenna for wireless connection to a LAN, a telephone line A telephone line connector and the like are provided for connection, and information devices such as a personal computer, a mobile phone, and a telephone can be connected to various networks via a multimedia terminal unit.

  In recent years, a multimedia terminal unit has been developed in which various cables connected to the multimedia terminal unit can be wired in the wall by installing the multimedia terminal unit in the wall. For example, Patent Document 1 discloses a multimedia terminal unit provided with an antenna for wireless LAN connection and a LAN cable connector for wired LAN connection. Further, the inventor of the present invention, in Non-Patent Document 1, discloses a multimedia terminal unit provided with a LAN cable connector for wired LAN connection, a telephone line connector for telephone line connection, and an antenna for wireless LAN connection. If the multimedia terminal unit is embedded in the wall and installed, the wiring can be stored in the wall, so that the wiring can be prevented from impairing the appearance of the room.

JP, 2013-157738, A

"AE1021 / AE1021PE Sales Release Notice", [online], August 22, 2014, FXC Corporation, [Search on June 25, 2015], Internet <URL: https://www.fxc.jp/news /20140822.html>

  When alternating current is introduced into the multimedia terminal unit from the outside, an orthogonal transformation circuit block (converter in Patent Document 1) for converting alternating current into direct current is provided in the multimedia terminal unit. Here, the orthogonal transformation circuit block generates electromagnetic noise, and the electromagnetic noise may interfere with the antenna to cause communication failure. An object of the present invention is to provide a multimedia terminal unit capable of reducing the occurrence of communication failure due to electromagnetic noise generated from an orthogonal transformation circuit block and improving the signal reception sensitivity.

  Also, if the multimedia terminal unit is installed in the wall, generally the volume in the multimedia terminal unit can not be increased. For example, the multimedia terminal unit described in Non-Patent Document 1 has a width of 42.1 mm, a height of 68.7 mm, and a depth of 48 mm, and it is necessary to house various connectors, antennas, orthogonal transformation circuit blocks, etc. is there. Therefore, an object of the present invention is to provide a multimedia terminal unit capable of effectively utilizing a limited space.

  According to a first aspect of the present invention, there is provided a multimedia terminal unit having a front surface exposed to a room and installed in a wall, wherein at least the front surface is made of a plastic material. A first electronic circuit board provided substantially parallel to the front surface, a high frequency processing circuit disposed in a first region of the first electronic circuit board, and an orthogonal transformation disposed below the high frequency processing circuit An antenna for a signal for processing input and output in the high frequency processing circuit provided between the circuit block, the first electronic circuit board, and the front surface, at least a part of the first region, and the orthogonal transformation A multimedia terminal unit is provided comprising at least a portion of the circuit block and a first ground conductor provided between the antenna.

  In a second aspect of the present invention, the first electronic circuit board is vertically positioned with respect to the first electronic circuit board at a position of the first electronic circuit board between the first region of the first electronic circuit board and the orthogonal transformation circuit block. A multimedia terminal unit according to the first invention having a second electronic circuit board arranged.

  Also, as a third invention, the multimedia terminal unit according to the second invention is provided, wherein the second electronic circuit substrate is a multilayer substrate, and one of the layers is a second ground conductor.

  Also, as a fourth invention, the multimedia terminal unit according to any one of the first to third inventions, wherein the first electronic circuit substrate is a multilayer substrate, and the first layer is a first ground conductor. I will provide a.

  Also, as a fifth invention, the multimedia according to any one of the first to fourth inventions, wherein the antenna is attached to the inner surface of the casing on the back surface side of the front surface with an adhesive or / and a double-sided tape. Provide terminal unit.

  As a sixth invention, the multimedia terminal unit according to any one of the first to fifth inventions is provided, wherein the front surface and the wall surface of the room are substantially flush.

  Further, as a seventh invention, the electronic circuit board further includes a LAN connector provided on the first electronic circuit board and having an insertion opening on the front surface, and at least a part of the first electronic circuit board provided with the LAN connector A multimedia terminal unit according to a fourth invention or a fifth invention according to the fourth invention provided with a third ground conductor connected to the first ground conductor in an alternating manner is provided.

  An eighth invention provides the multimedia terminal unit according to any one of the first to seventh inventions, wherein a plurality of the antennas are provided.

  Also, as a ninth invention, the multimedia terminal according to any one of the first to eighth inventions, wherein the distance between the lowermost part of the high frequency processing circuit and the uppermost part of the orthogonal transformation circuit block is 5 mm or more. Provide a unit.

  The multimedia terminal unit of the present invention can reduce the occurrence of communication failure due to electromagnetic noise and improve signal reception sensitivity by absorbing electromagnetic noise generated from the orthogonal transformation circuit block into the first ground conductor. it can. In addition, by providing the second electronic circuit board disposed vertically to the first electronic circuit board, the limited space in the multimedia terminal unit can be effectively utilized.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. The relationship between the embodiment and the claims is as follows. First, the first embodiment mainly corresponds to claims 1, 5, 9 and the like. The second embodiment mainly corresponds to claim 2 and the like. The third embodiment mainly corresponds to claims 3 and 4 and the like. The fourth embodiment mainly corresponds to the sixth aspect and the like. The fifth embodiment mainly corresponds to the seventh aspect and the like. The sixth embodiment mainly corresponds to the eighth aspect and the like. The present invention is not limited to the description of the embodiments and the drawings at all, and can be implemented in various modes without departing from the scope of the invention.
<< First Embodiment >>
<Overview>

The multimedia terminal unit of the present embodiment can reduce the occurrence of communication failure due to electromagnetic noise and improve signal reception sensitivity by absorbing electromagnetic noise generated from the orthogonal transformation circuit block into the first ground conductor. It is characterized by the ability to
<Configuration>

  FIG. 1 is a schematic view showing an example of the configuration of the multimedia terminal unit of the present embodiment, where (a) is a side view as viewed from the front, (b) is a sectional side view, and (c) is a sectional top view. ing. For example, the multimedia terminal unit according to the present embodiment mainly includes the housing (0101), the first electronic circuit board (0102), the high frequency processing circuit (0103), the orthogonal transformation circuit block (0104), and the antenna ( 0105) and the first ground conductor (0106). Each component will be described below.

(Housing)
The housing (0101) is configured such that at least the front surface (0111) is made of a plastic material. In order to transmit and receive signals between the information device in the room and the antenna, the front surface of the housing needs to transmit the signals. Thus, the front of the housing is made of plastic material that transmits signals. Although the size of the housing can be designed as appropriate, since the multimedia terminal unit of the present invention is installed in the wall, the size of the housing is set to be installable in the wall. For example, the height is preferably about 65 to 75 mm, the width is about 35 to 45 mm, and the depth is about 35 to 45 mm.

  In the example shown in FIG. 1, the casing has a convex shape in which the front surface is projected when the multimedia terminal unit is viewed from the top in relation to various tools when installing the multimedia terminal unit on a wall. However, the shape of the housing is not particularly limited.

(First electronic circuit board)
The first electronic circuit board (0102) is configured to be provided substantially parallel to the front in the housing. That is, it is indicated that the first electronic circuit board is provided such that the board surface and the front surface of the housing are substantially parallel, for example, an angle formed by the substrate surface of the first electronic circuit board and the front surface of the housing The first electronic circuit board is provided so as to make the angle 5 degrees or less. The first electronic circuit board may be, for example, screwed to the housing and fixed. In addition, the high frequency processing circuit mentioned later is provided on a 1st electronic circuit board.

  There is no particular limitation on the size of the first electronic circuit board, as long as it fits inside the case. For example, in order to perform complicated signal processing in a high frequency processing circuit described later, the size of the first electronic circuit board may be the largest area that can be taken in the housing. Specifically, the size of the first electronic circuit board may be substantially the same as the width and height of the housing (width and height excluding the thickness of the housing).

  The first electronic circuit board may be provided with a WAN cable connector (0113) for connecting a WAN cable. The WAN cable is electrically connected to the high frequency processing circuit on the first electronic circuit board through the WAN cable connector, that is, the high frequency processing circuit is connected to the WAN. Further, in order to connect the WAN cable to the WAN cable connector, an opening (0115) may be provided at a position corresponding to the WAN cable connector in the housing.

(High frequency processing circuit)
The high frequency processing circuit (0103) is disposed in the first region (0112) of the first electronic circuit board. That is, the first area indicates the arrangement area of the high frequency processing circuit on the first electronic circuit board. The high frequency processing circuit has a so-called router function, and processes signals transmitted and received between the information device in the room and the antenna.

(Orthogonal transformation circuit block)
The orthogonal transformation circuit block (0104) is disposed below the high frequency processing circuit. That is, the orthogonal transformation circuit block is arranged such that the top (1b) of the orthogonal transformation circuit block is lower than the lowermost part (1a) of the high frequency processing circuit in a side view of the multimedia terminal unit. The orthogonal transformation circuit block may be, for example, screwed and fixed to the housing. The orthogonal transformation circuit block may be provided with a power supply line connector (0114) for connection to a power supply line. Further, in order to connect the power supply line to the power supply line connection connector, an opening (0116) may be provided at a position corresponding to the power supply line connection connector in the housing.

  The shape of the orthogonal transformation circuit block is not particularly limited. For example, the components constituting the orthogonal transformation circuit block may be included in a case or the like, or may be provided on a circuit board.

  The orthogonal transformation circuit block converts alternating current supplied to the multimedia terminal unit through the power supply line into direct current, and the converted direct current is supplied to the first electronic circuit board, and the high frequency on the first electronic circuit board Operate a processing circuit or the like. Therefore, the orthogonal transformation circuit block is composed of a converter that converts alternating current to direct current, a stabilization circuit that stabilizes the converted direct current, and a voltage step-down circuit that steps down a voltage.

  Electromagnetic noise generated from the orthogonal transformation circuit block may interfere with the high frequency processing circuit to cause communication failure. Therefore, it is preferable that the distance between the orthogonal transformation circuit block and the high frequency processing circuit be larger, for example, the distance (l1) between the lowermost portion (1a) of the high frequency processing circuit and the top portion (1b) of the orthogonal transformation circuit block is 5 mm It is preferable that the distance is more than that.

  Also, the supply of alternating current to the orthogonal transformation circuit block is generally performed by wiring a power supply line from the lower side of the multimedia terminal unit. Therefore, by arranging the orthogonal transformation circuit block below the high frequency processing circuit, the wiring of the power supply line can be minimized. Furthermore, by minimizing the wiring of the power supply line, it is possible to minimize the electromagnetic noise generated from the power supply line. Then, the electromagnetic noise generated from the power supply line can minimize interference with an antenna or the like in the multimedia terminal unit.

(antenna)
An antenna (0105) is provided between the first electronic circuit board and the front surface, and is provided for signals for processing the input and output in the high frequency processing circuit. The signal received via the antenna is transmitted to the high frequency processing circuit on the first electronic circuit board via the wiring (not shown). Similarly, the signal output from the high frequency processing circuit is transmitted to the antenna through the wiring, and the signal is transmitted from the antenna. "Between the first electronic circuit board and the front surface" means between the substrate surface of the first electronic circuit board facing the front surface of the housing and the back surface (inner surface of the housing) of the front surface of the housing Show. It is preferable to use a planar antenna as the antenna, since the antenna is installed in a limited space in the multimedia terminal unit. The antenna may be provided in any form, for example, it may be attached to the inner surface of the case on the back side of the front side with an adhesive or / and a double-sided tape.

(First ground conductor)
The first ground conductor (0106) is provided between the antenna and at least a portion of the first region and at least a portion of the orthogonal transformation circuit block. That is, when the first ground conductor is viewed from the front of the multimedia terminal unit, the first area, the area where the orthogonal transformation circuit block is installed, and the area where the first ground conductor is installed are at least partially It is provided to overlap. In the example shown in FIG. 1, the first ground conductor is provided on the first electronic circuit board on the front side of the multimedia terminal unit. The first ground conductor is made of a conductor as the name suggests, and may be made of, for example, a metal plate or a conductive rubber plate. The first ground conductor is preferably configured to ground the first electronic circuit board, but may not necessarily be configured to ground the first electronic circuit board. Furthermore, the first ground conductor itself may or may not be grounded.

  FIG. 2 is a perspective view of the multimedia terminal unit of the present embodiment as viewed from the front, showing first ground conductors (0106a, 0106b, 0106c), first areas (0112), and the like in the housing (0101). The arrangement relation of the orthogonal transformation circuit block (0104) is shown. The hatched area is an area where the first ground conductor, the first area, and the orthogonal transformation circuit block overlap.

  The first ground conductor is provided to absorb the electromagnetic noise generated from the orthogonal transformation circuit block and to reduce the occurrence of communication failure due to the interference of the electromagnetic noise to the antenna. Therefore, it is preferable to absorb the electromagnetic noise radiated from the orthogonal transformation circuit block toward the antenna as much as possible to the first ground conductor. Therefore, it is preferable that the area where the first ground conductor and the orthogonal transformation circuit block overlap occupy 80% or more of the area where the orthogonal transformation circuit block is installed.

  Specifically, for example, as shown in (a), when the multimedia terminal unit is viewed from the front, the area where the first ground conductor is provided includes the first area and part of the orthogonal transformation circuit block It is good also as composition provided as mentioned above, and as shown to (b), it may constitute so that all may be included. On the other hand, in the case of (c), the area where the first ground conductor and the orthogonal transformation circuit block overlap is not more than 50% of the area where the orthogonal transformation circuit block is installed, which is not preferable.

  FIG. 3 is a perspective view of the multimedia terminal unit according to this embodiment as viewed from the front, showing the arrangement relationship between the first ground conductor (0106) and the antenna (0105a, 0105b) in the housing (0101). Is shown. By providing the first ground conductor between at least a portion of the first region and at least a portion of the orthogonal transformation circuit block, and the antenna, signals scattered in the multimedia terminal unit without being received by the antenna or The electromagnetic noise generated from the high frequency processing circuit is absorbed by the first ground conductor, and the reception sensitivity of the signal transmitted from the information device can be improved.

  When the multimedia terminal unit is viewed from the front, it is preferable that the area where the first ground conductor is installed be larger than the area where the antenna is installed. Specifically, when the multimedia terminal unit is viewed from the front, the antenna width is Wa, the first ground conductor width is We, and the binary difference w1 = (We−Wa) / 2, w1> 0. It is preferable to set it as .5 Wa. Similarly, it is preferable to set h1> 0.5Ha, where the height of the antenna is Ha, the width of the first ground conductor is He, and the binary difference h1 = (He−Ha) / 2. By adopting such a configuration, the reception sensitivity of the signal transmitted from the information device can be improved.

  When the antenna is not a rectangular one as shown in (a) but, for example, an elliptical one as shown in (b), the width Wa of the antenna indicates the maximum width of the antenna. Do. Similarly, the height Ha of the antenna indicates the maximum height of the antenna.

FIG. 4 is a cross-sectional side view showing an example of the multimedia terminal unit of the present embodiment. It is preferable that the distance 12 between the antenna and the first ground conductor be 5 mm ≦ 12 ≦ 15 mm. Here, the distance between the antenna and the first ground conductor indicates the shortest distance between the antenna and the first ground conductor. By adopting such a configuration, the reception sensitivity of the signal transmitted from the information device can be improved.
<Effect>

The multimedia terminal unit of the present embodiment can reduce the occurrence of communication failure due to electromagnetic noise and improve signal reception sensitivity by absorbing electromagnetic noise generated from the orthogonal transformation circuit block into the first ground conductor. Can.
<< Embodiment 2 >>
<Overview>

The basic configuration of the multimedia terminal unit of this embodiment is the same as that of Embodiment 1, but differs in that it has a second electronic circuit board in addition to the first electronic circuit board.
<Configuration>

  FIG. 5 is a schematic view showing an example of the multimedia terminal unit of the present embodiment, wherein (a) is a side view as viewed from the front, (b) is a sectional side view, and (c) is a sectional top view. There is. For example, the multimedia terminal unit of the present embodiment mainly includes a housing (0501), a first electronic circuit board (0502), a high frequency processing circuit (0503), an orthogonal transformation circuit block (0504), and an antenna (0505). , A first ground conductor (0506), and a second electronic circuit board (0507). As in the case of the multimedia terminal unit described in the first embodiment, the first electronic circuit board is provided with a WAN cable connector (0513) for connecting a WAN cable, and the housing corresponds to the WAN cable connector. An opening (0515) is provided at the position, and the orthogonal transformation circuit block is provided with a power supply line connector (0514) for connection to a power supply line, and for connecting the power supply line to the power supply line connection connector, An opening (0516) may be provided at a position corresponding to the power supply line connector. The description of the same configuration as that of the first embodiment is omitted, and the second electronic circuit board will be mainly described below.

(Second electronic circuit board)
The second electronic circuit board (0507) is vertically arranged with respect to the first electronic circuit board at a position of the first electronic circuit board between the first region (0512) of the first electronic circuit board and the orthogonal transformation circuit block. Placed in the mold. That is, the second electronic circuit board is substantially perpendicular to the first electronic circuit board between the lowermost portion (5a) of the first region of the first electronic circuit board and the top (5b) of the orthogonal transformation circuit block To be disposed on the first electronic circuit board. Here, the connection of the first electronic circuit board and the second electronic circuit board can be performed using, for example, a board connector (not shown).

  If the second electronic circuit board is installed in addition to the first electronic circuit board, the substrate area in the multimedia terminal unit can be expanded. Since the multimedia terminal unit of the present invention is installed in the wall, the space in the multimedia terminal unit is limited. As a result, the size of the first electronic circuit board that can be installed in the multimedia terminal unit is also limited, and the number of electronic components that can be mounted on the first electronic circuit board is also limited, so that complex signal processing can not be performed. There was a point. Therefore, by installing a second electronic circuit board in addition to the first electronic circuit board and expanding the board area, it becomes possible to mount complex electronic circuits in the multimedia terminal unit, and complex signal processing is also possible. It can be carried out.

(Second ground conductor)
A second ground conductor may be provided in the multimedia terminal unit of the present embodiment. The second ground conductor (0508) is vertically disposed relative to the first electronic circuit board at a position between the first region of the first electronic circuit board and the orthogonal transformation circuit block. In the example shown in FIG. 5, the second ground conductor is provided on the second electronic circuit board. Note that the second ground conductor is made of a conductor in the same manner as the first ground conductor, and may be made of, for example, a metal plate or a conductive rubber plate. The second ground conductor is preferably configured to ground the second electronic circuit board, but is not necessarily configured to ground the second electronic circuit board. Furthermore, the second ground conductor itself may or may not be grounded. The first ground conductor and the second ground conductor may or may not be electrically connected.

  FIG. 6 is a perspective view of the multimedia terminal unit of the present embodiment as viewed from the front, showing the second ground conductor (0508a, 0508b) and the orthogonal transformation circuit block (0504) in the housing (0501). It shows the arrangement relationship. The hatched area is an area where the second ground conductor and the orthogonal transformation circuit block overlap. In addition, description is abbreviate | omitted about other structures, such as a 1st electronic circuit board, a 1st grounding conductor, and an antenna, for explanation.

  The second ground conductor absorbs electromagnetic noise generated from the orthogonal transformation circuit block, and is provided to reduce the occurrence of communication failure due to interference of the electromagnetic noise with the high frequency processing circuit. Therefore, it is preferable to absorb the electromagnetic noise emitted from the orthogonal transformation circuit block toward the high frequency processing circuit as much as possible to the second ground conductor. Therefore, it is preferable that the area where the second ground conductor and the orthogonal transformation circuit block overlap occupy 80% or more of the area where the orthogonal transformation circuit block is installed.

Specifically, in the case of the example shown in (a), the area where the second ground conductor and the orthogonal transformation circuit block overlap occupies 80% or more of the area where the orthogonal transformation circuit block is installed. It is suitable. On the other hand, in the case of the example shown in (b), the area where the second ground conductor and the orthogonal transformation circuit block overlap is not preferable because it is 50% or less of the area where the orthogonal transformation circuit block is installed.
<Effect>

The multimedia terminal unit of this embodiment can effectively utilize the limited space in the multimedia terminal unit by providing the second electronic circuit board in addition to the first electronic circuit board. Also, by causing the second ground conductor to absorb the electromagnetic noise generated from the orthogonal transformation circuit block, the occurrence of communication failure due to the electromagnetic noise can be reduced, and the signal reception sensitivity can be improved.
<< Third Embodiment >>
<Overview>

The basic configuration of the multimedia terminal unit of this embodiment is the same as in Embodiments 1 and 2, but the first electronic circuit board or / and the second electronic circuit board is a multilayer board, and one layer thereof Is a first ground conductor or / and a second ground conductor.
<Configuration>

  FIG. 7 is a cross-sectional side view showing an example of the multimedia terminal unit of the present embodiment. Similarly to the multimedia terminal unit described in the first embodiment, (a) mainly includes a housing (0701), a first electronic circuit board (0702), a high frequency processing circuit (0703), and an orthogonal transformation circuit block ( The first electronic circuit board is a multilayer board, and one of the layers is a first ground conductor, although it is composed of 0704), an antenna (0705), and a first ground conductor (0706). Also, (b) shows the case (0701), the first electronic circuit board (0702), the high frequency processing circuit (0703), and the orthogonal transformation circuit block (the same as the multimedia terminal unit described in the second embodiment. 0704), an antenna (0705), a first ground conductor (0706), a second electronic circuit board (0707), and a second ground conductor (0708), but the second electronic circuit board Is a multilayer substrate, one layer of which is a second ground conductor. The high frequency processing circuit is disposed in the first area (0712) of the first electronic circuit board.

  In the same manner as the multimedia terminal unit described in the first embodiment, in the multimedia terminal unit of the present embodiment, the first electronic circuit board is provided with a WAN cable connector (0713) for connecting a WAN cable. An opening (0715) is provided at a position corresponding to the WAN cable connector in the housing, and the orthogonal transformation circuit block is provided with a power supply line connector (0714) for connecting to a power supply line, and the power supply line connection connector In order to connect the power supply line, an opening (0716) may be provided in the housing at a position corresponding to the power supply line connection connector.

(Multilayer board)
When the first electronic circuit substrate and / or the second electronic circuit substrate is a multilayer substrate, the substrate area on which the electronic component can be mounted can be expanded. By expanding the substrate area, complex electronic circuits can be implemented in the multimedia terminal unit, and complex signal processing can be performed.

In the multilayer substrate used as the first electronic circuit substrate or / and the second electronic circuit substrate, when the one layer is the ground of the multilayer substrate, the ground of the multilayer substrate is used as the first ground conductor or / and the second It can be used as a ground conductor. Therefore, in realizing the multimedia terminal unit of the present invention, it is not necessary to separately provide the first ground conductor or / and the second ground conductor separately from the first electronic circuit board or / and the second electronic circuit board, and the efficiency can be improved. Is good.
<Effect>

The multimedia terminal unit of this embodiment can expand the substrate area in the multimedia terminal unit by using the first electronic circuit board or / and the second electronic circuit board as a multilayer board, and complex signal processing It is possible to do In addition, by forming one layer of the multilayer substrate as the first ground conductor or / and the second ground conductor, the first ground conductor or / and the second circuit separately from the first electronic circuit board or / and the second electronic circuit board There is no need to provide a ground conductor, which is efficient.
<< Embodiment 4 >>
<Overview>

This embodiment shows the installation on the wall of the multimedia terminal unit described in the first to third embodiments. The same applies to multimedia terminal units described in the fifth and sixth embodiments described later.
<Configuration>

  FIG. 8 is a schematic view showing an example of a multimedia terminal unit installed in a wall, wherein (a) is a side view from the front, (b) is a cross-sectional side view, and (c) is a top cross-section Figure is shown. The internal configuration of the multimedia terminal unit has already been described in the first to third embodiments, and thus the description thereof is omitted. The multimedia terminal unit shown in FIG. 4 shows the example described in the third embodiment.

  The multimedia terminal unit (0801) of the present invention is installed in a wall (0802) with its front surface exposed indoors. Although the method of installation is not particularly limited, for example, a wall (0803) for sandwiching the multimedia terminal unit is provided in the wall, and the cover (0804) is covered from the indoor side, whereby the wall of the multimedia terminal unit becomes a wall. It may be installed inside.

  When the multimedia terminal unit of the present invention is installed in a wall, the front surface (0805) of the multimedia terminal unit and the wall surface (0806) of the room may be substantially flush. “The front surface and the wall surface of the room are substantially flush” indicates that the front surface of the multimedia terminal unit and the wall surface of the room exist on substantially the same plane. Specifically, the protrusion amount Tf of the front surface of the multimedia terminal unit with respect to the wall surface in the room may be 5 mm or less.

  In the multimedia terminal unit described in Non-Patent Document 1, in order to improve the reception sensitivity of the antenna, it is necessary to project the antenna from the wall by a certain amount, that is, the multimedia terminal unit projects from the wall. If the multimedia terminal unit protrudes from the wall, there is a risk that the multimedia terminal unit will come in contact with the person when the person passes near the wall, and if it comes in contact, the person may be injured. Or the multimedia terminal unit may be damaged.

  However, the multimedia terminal unit of the present invention is provided with the first ground conductor inside, and is generated from the signal scattered in the multimedia terminal unit without being received by the antenna of the antenna, or from the high frequency processing circuit By absorbing electromagnetic noise etc. in the first ground conductor, it is possible to improve the reception sensitivity of the signal transmitted from the information device, so the front surface of the multimedia terminal unit and the wall surface in the room are approximately flush. Also in this case, sufficient antenna reception sensitivity can be obtained. Therefore, by making the front surface of the multimedia terminal unit and the wall surface of the room substantially flush, it is possible to prevent the situation in which the multimedia terminal unit and a person are in contact with each other.

Although the example shown in FIG. 8 shows a configuration in which only the multimedia terminal unit is installed on the wall, the multimedia terminal unit of the present invention is used as an information outlet in addition to an outlet and a modular jack. You may use it as a part.
<Effect>

Since the multimedia terminal unit of the present invention is configured such that the front surface and the wall surface of the room are substantially flush with each other, the multimedia terminal unit may come into contact with a person, resulting in personal injury or multimedia It is possible to eliminate the situation where the terminal unit is damaged.
<< Embodiment 5 >>
<Configuration>
The basic configuration of the multimedia terminal unit of the present embodiment is the same as in the first to third embodiments, except that it has a LAN connector and a third ground conductor.
<Configuration>

  FIG. 9 is a schematic view showing an example of the multimedia terminal unit of the present embodiment, where (a) is a side view as viewed from the front, (b) is a sectional side view, and (c) is a sectional top view. There is. For example, the multimedia terminal unit of the present embodiment mainly includes a housing (0901), a first electronic circuit board (0902), a high frequency processing circuit (0903), an orthogonal transformation circuit block (0904), and an antenna (0905). And the first ground conductor (0906), the second electronic circuit board (0907), the second ground conductor (0908), the LAN connector (0909), and the third ground conductor (0910). Ru. The high frequency processing circuit is disposed in the first area (0912) of the first electronic circuit board.

  In the same manner as the multimedia terminal unit described in the first embodiment, in the multimedia terminal unit of this embodiment, the first electronic circuit board is provided with a WAN cable connector (0913) for connecting a WAN cable. An opening (0915) is provided at a position corresponding to the WAN cable connector in the housing, and the orthogonal transformation circuit block is provided with a power supply line connector (0914) for connecting to a power supply line, and the power supply line connector In order to connect the power supply line, an opening (0916) may be provided at a position corresponding to the power supply line connection connector in the housing. The multimedia terminal unit shown in FIG. 9 is the multimedia terminal unit described in the third embodiment further provided with a LAN connector and a third ground conductor. The multimedia terminal described in the first and second embodiments The unit may further be provided with a LAN connector and a third ground conductor. The following mainly describes the LAN connector and the third ground conductor.

(LAN connector)
The LAN connector (0909) is provided on the first electronic circuit board and has an insertion opening on the front surface. A LAN cable connected to the information device is connected to the LAN connector. In addition, in order to connect the LAN cable to the LAN connector, an opening (0917) may be provided at a position corresponding to the LAN connector in the housing.

  The multimedia terminal unit described in the first to third embodiments performs the wireless communication with the information device through the antenna, but the multimedia terminal unit of the present embodiment is added to the wireless communication through the antenna. Also, wired communication can be performed via a LAN cable connected to the LAN connector. Wireless communication has an advantage that information devices can be used without being tied to a cable, but is inferior to wired communication in terms of communication interference due to radio wave interference, safety, and communication speed. Therefore, by providing a LAN connector in the multimedia terminal unit, it is possible to simultaneously provide wireless communication and wired communication to information devices in the room, and the user of the network selectively uses wireless communication and wired communication depending on the application. be able to.

  Although the example shown in FIG. 9 shows an example in which one LAN connector is provided in the multimedia terminal unit, the number of LAN connectors is not particularly limited, and a plurality of LAN connectors may be provided.

(Third ground conductor)
In the multimedia terminal unit of the present embodiment, a third ground conductor (0910) which is galvanically connected and galvanically connected to the first ground conductor to at least a part of the first electronic circuit board provided with the LAN connector ) Is provided. “At least a part of the first electronic circuit board provided with the LAN connector” indicates at least a part of the area where the LAN connector is provided on the first electronic circuit board, and The ground conductor is provided in such a region. The third ground conductor is mainly configured to ground the LAN connector. The third ground conductor is made of a conductor as in the case of the first ground conductor and the second ground conductor, and may be made of, for example, a metal plate or a conductive rubber plate.

  FIG. 10 is a perspective view of the multimedia terminal unit of the present embodiment as viewed from the front, and in the housing (0901), the first ground conductor (0906a, 0906b, 0906c) and the third ground conductor (0910a, The arrangement relationship between 0910 b and 0910 c) is shown. For example, as shown in (a) and (b), the third ground conductor may be provided on the first electronic circuit board so as to cover all the area where the LAN connector is provided, (c) As shown in FIG. 3, the third ground conductor may be provided to cover a part of the area where the LAN connector is provided on the first electronic circuit board. Further, as shown in (c), the first ground conductor may be provided so as to cover a part of the area where the LAN connector is provided on the first electronic circuit board.

  As described in the first embodiment, the first ground conductor is provided to absorb the electromagnetic noise generated from the orthogonal transformation circuit block and to reduce the occurrence of communication failure due to the interference of the electromagnetic noise to the antenna. Therefore, the third ground conductor is not only provided for the grounding of the LAN connector, but also absorbs the electromagnetic noise generated from the orthogonal transformation circuit block and reduces the occurrence of communication failure due to the electromagnetic noise interfering with the antenna and the LAN connector. Provided to In addition, in order to reduce the situation where electromagnetic noise radiated toward the antenna from the orthogonal transformation circuit block reaches the antenna, the first ground conductor and the third ground conductor are installed as close as possible. It is preferable to minimize the situation in which electromagnetic noise leaks from the gap between the first ground conductor and the third ground conductor.

“The third ground conductor which is galvanically isolated and connected to the first ground conductor” indicates, for example, that the first ground conductor and the third ground conductor are connected via a capacitor. An external LAN cable is connected to the LAN connector, so it is susceptible to external static electricity. Since the electrostatic voltage is large, if the LAN connector is grounded by the first ground conductor, the static electricity conducted from the LAN connector to the first ground conductor may affect the first electronic circuit board. Therefore, when the first ground conductor and the third ground conductor are connected via a capacitor as a configuration in which the LAN connector is grounded by the third ground conductor, static electricity affects the electronic components on the first electronic circuit board Can be reduced.
<Effect>

The multimedia terminal unit of this embodiment can provide wired communication and wireless communication with the information device in the room by having the LAN connector. In addition, by providing the third ground conductor which is galvanically isolated from the first ground conductor and connected in an alternating manner, it is possible to reduce the situation where static electricity affects the electronic components on the first electronic circuit board.
<< Embodiment 6 >>
<Overview>

The basic configuration of the multimedia terminal unit of this embodiment is the same as in the first to third and fifth embodiments, except that a plurality of antennas are provided.
<Configuration>

  FIG. 11 is a cross-sectional side view showing an example of the multimedia terminal unit of the present embodiment. For example, the multimedia terminal unit of this embodiment mainly includes a housing (1101), a first electronic circuit board (1102), a high frequency processing circuit (1103), an orthogonal transformation circuit block (1104), and an antenna (1105a). , 1105 b), the first ground conductor (1106), the second electronic circuit board (1107), the second ground conductor (1108), the LAN connector (1109), and the third ground conductor (1110) Configured The high frequency processing circuit is disposed in the first area (1112) of the first electronic circuit board.

  In the same manner as the multimedia terminal unit described in the first embodiment, in the multimedia terminal unit of the present embodiment, the first electronic circuit board is provided with a WAN cable connector (1113) for connecting a WAN cable. An opening (1115) is provided in the housing at a position corresponding to the WAN cable connector, and the orthogonal transformation circuit block is provided with a power supply line connector (1114) for connecting to a power supply line, and the power supply line connector In order to connect the power supply line, an opening (1116) may be provided in the housing at a position corresponding to the power supply line connection connector. Further, in order to connect the LAN cable to the LAN connector, an opening (1117) may be provided at a position corresponding to the LAN connector in the housing. Further, although the multimedia terminal unit shown in FIG. 6 is provided with two antennas in the multimedia terminal unit described in the fifth embodiment, the antenna in the multimedia terminal unit described in the first to third embodiments is the same. Two may be provided.

  For example, when two antennas are provided in the multimedia terminal unit as shown in FIG. 11, one antenna is made compatible with IEEE 802.11n, IEEE 802.11 g, and IEEE 802.11 b whose frequency band is 2.4 GHz. The other antenna can be configured to correspond to IEEE 802.11a whose frequency band is 5.2 GHz. Then, a device (mobile phone) that requires transmission and reception of a large amount of information such as streaming video playback is configured to perform wireless communication using an antenna compatible with IEEE 802.11a, and in particular, a device that does not require transmission and reception of a large amount of information Can provide an efficient wireless environment in which wireless communication is performed using antennas compliant with IEEE 802.11n, IEEE 802.11g, and IEEE 802.11b.

  In addition, multiple-input and multiple-output (MIMO) transmission can be performed using a plurality of antennas. “MIMO” is a technology for exchanging signals using a plurality of antennas, and the communication speed can be improved by using this technology.

FIG. 12 is a perspective view of the multimedia terminal unit of the present embodiment as viewed from the front, showing the arrangement of a plurality of antennas in a housing (1101). For example, assuming that two antennas are provided in the multimedia terminal unit, the arrangement of the two antennas is not particularly limited, and two antennas (1105a and 1105b) may be provided at the top and bottom as shown in (a). As shown to (b), two antennas (1105c, 1105d) may be provided in right and left.
<Effect>

  The multimedia terminal unit of the present embodiment can provide wireless communication using a plurality of frequency bands by providing a plurality of antennas.

Schematic diagram showing an example of the configuration of the multimedia terminal unit of the first embodiment A perspective view of the multimedia terminal unit of Embodiment 1 as viewed from the front A perspective view of the multimedia terminal unit of Embodiment 1 as viewed from the front Cross-sectional side view showing an example of the multimedia terminal unit of Embodiment 1 Schematic diagram showing an example of a multimedia terminal unit of Embodiment 2 A perspective view of the multimedia terminal unit of Embodiment 2 as viewed from the front Sectional side view showing an example of the multimedia terminal unit of Embodiment 3 A schematic diagram showing an example of a multimedia terminal unit installed in a wall Schematic diagram showing an example of the multimedia terminal unit of the fifth embodiment A perspective view of the multimedia terminal unit of Embodiment 5 as viewed from the front Cross-sectional side view showing an example of the multimedia terminal unit of Embodiment 6 Perspective view of the multimedia terminal unit of Embodiment 6 as viewed from the front

0101: housing, 0102: first electronic circuit board, 0103: high frequency processing circuit, 0104: orthogonal transformation circuit block, 0105: antenna, 0106: first ground conductor, 0111: front surface, 0112: first region, 0113: WAN Cable connector, 0114: Power supply line connector, 0115: Opening, 0116: Opening

Claims (9)

A multimedia terminal unit installed in a wall with the front exposed to the room,
A housing at least the front surface of which is made of a plastic material,
A first electronic circuit board provided substantially parallel to the front surface in the housing;
A high frequency processing circuit disposed in a first region of the first electronic circuit board;
An orthogonal transformation circuit block disposed below the high frequency processing circuit;
An antenna for a signal for processing input and output in the high frequency processing circuit provided between the first electronic circuit board and the front surface;
A first ground conductor provided between at least a portion of the first region and at least a portion of the orthogonal transformation circuit block, and an antenna;
Multimedia terminal unit.   A second electronic circuit board vertically disposed with respect to the first electronic circuit board at a position of the first electronic circuit board between the first region of the first electronic circuit board and the orthogonal transformation circuit block A multimedia terminal unit according to claim 1, comprising:   The multimedia terminal unit according to claim 2, wherein the second electronic circuit board is a multilayer board, and one of the layers is a second ground conductor.   The multimedia terminal unit according to any one of claims 1 to 3, wherein the first electronic circuit board is a multilayer board, and one of the layers is a first ground conductor.   The multimedia terminal unit according to any one of claims 1 to 4, wherein the antenna is attached to the inner surface of the casing on the back surface side of the front surface with an adhesive or / and a double-sided tape.   The multimedia terminal unit according to any one of claims 1 to 5, wherein the front surface and the wall surface of the room are substantially flush with each other. The electronic circuit board further comprises a LAN connector provided on the first electronic circuit board and having an insertion opening on the front side,
The fourth ground conductor is provided on at least a part of the first electronic circuit board provided with the LAN connector, the third ground conductor being galvanically isolated from the first ground conductor and connected in an alternating manner. A multimedia terminal unit according to claim 5 or 6, which is subordinate to.   The multimedia terminal unit according to any one of claims 1 to 7, wherein a plurality of the antennas are provided.   The multimedia terminal unit according to any one of claims 1 to 8, wherein the distance between the lowermost portion of the high frequency processing circuit and the uppermost portion of the orthogonal transformation circuit block is 5 mm or more.

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