JP4653581B2 - Retransmission antenna and retransmission antenna with amplifier - Google Patents

Description

  The present invention relates to a retransmission antenna and a retransmission antenna with an amplifier of a gap filler device for digital terrestrial broadcasting that is used, for example, to relay a terrestrial digital broadcasting wave indoors.

In recent years, digital broadcasting has been started in terrestrial broadcasting systems. In this terrestrial digital broadcasting system, implementation of gap filler countermeasures is being studied for the purpose of expanding broadcasting service areas and eliminating difficult viewing areas.
In this gap filler countermeasure, a relay device called a gap filler is installed for each area where broadcast waves do not reach (for example, Patent Document 1 and Patent Document 2).

By the way, in the terrestrial digital broadcasting system, as in the analog broadcasting system, there is a demand for a digital broadcasting wave that can be received by the indoor receiving antenna of the television receiver. Even in such a broadcasting system, implementation of measures against gap filler for the purpose of eliminating the difficult viewing area indoors in addition to the broadcasting service area will be considered.
Therefore, there has been proposed a home gap filler device for digital terrestrial broadcasting for allowing a terrestrial digital broadcast wave to be received indoors by a broadcast receiver having a known indoor reception antenna without being limited by the reception location.

JP 2002-101032 A

JP2003-78492A.

  Since the above-mentioned home gap filler device has a simple configuration, there is an advantage that it is inexpensive. By the way, when this home gap filler device becomes widespread, a device that can be installed in a small house or a moving body such as a train is desired. In this case, the installation space must also be taken into consideration, and there are restrictions on installation regulations when installing on a moving body.

  As a countermeasure against this installation space, it may be possible to install it on the back of the ceiling or the wall, but in that case, it is expensive because it requires an expert to install and maintain the antenna, and the ceiling or wall members are electrically conductive. There is a risk that indoor radio wave irradiation may be hindered if a sexual substance is present.

  Therefore, an object of the present invention is to provide a retransmission antenna and a retransmission antenna with an amplifier that do not require a separate installation space indoors, are easy to install and maintain, and can realize a stable reception environment indoors. It is to provide.

In order to achieve the above object, the present invention is configured as follows.
It is used to receive terrestrial digital broadcast waves with a known indoor receiving antenna installed in a broadcast receiver. The terrestrial digital broadcast waves are received by a receiver installed outdoors, and this received signal is transmitted by a transmitter. Retransmitting antenna used as a transmitter in a gap filler device that retransmits toward an indoor receiving antenna, a cylinder that can be attached to a known lighting fixture for indoor installation, and provided in this cylinder, And an antenna element that radiates the reception signal from the reception unit as a retransmission signal to the outside of the cylinder. The cylindrical body is characterized in that it incorporates a power supply section that supplies power for causing the light emitting element that illuminates the interior together with the antenna element to emit light.

  According to this configuration, the antenna element is provided in a housing that can be attached to the lighting fixture together with the light emitting element by using the lighting fixture installed indoors. Therefore, it is not necessary to separately secure an installation space indoors, and the power supply wiring structure can be simplified, thereby providing a relatively small and inexpensive retransmission antenna. Further, when the antenna element breaks down, it is only necessary to replace the cylinder containing the failed antenna element with a cylinder containing a normal antenna element, so that installation / maintenance work is facilitated.

When the antenna element is arranged next to a wiring board on which a plurality of light emitting elements are mounted, a plurality of coils inserted into the wiring board at intervals of ¼ wavelength or less of the signal current flowing through the antenna element on the wiring board. It further comprises a frequency cut-off means for cutting off the high-frequency signal flowing through the.
According to this configuration, the high-frequency signal current flowing on the wiring board on which the light emitting element is mounted is blocked by the plurality of coils inserted at intervals of 1/4 wavelength or less of the signal current flowing in the antenna element. Therefore, the retransmitted wave radiated from the antenna element is not affected by the wiring board.

The cylindrical body has a cylindrical shape and is attached so as to be rotatable with respect to the lighting fixture, and is provided with a connection pin to a power supply unit that generates power to cause the light emitting element to emit light at both ends.
According to this configuration, the power to the light-emitting element can be supplied to the antenna element simply by fitting both ends of the cylindrical tube into the lighting fixture, and the retransmitted wave can be adjusted by rotating and adjusting the cylindrical tube. The radiation direction can be adjusted.

Further, a reflection plate is provided, and the retransmission signal radiated from the antenna element is reflected by the reflection plate so that the directivity direction is directed indoors.
According to this configuration, in order to obtain a stable reception environment indoors, the reflector is used to realize unidirectionality toward the indoors, so that the electric field strength at the reception point can be increased.

  Used to receive terrestrial digital broadcast waves with a known indoor receiving antenna installed in a broadcast receiver, receives digital terrestrial broadcast waves with a receiver installed outdoors, and receives the received signal with an amplifier. A retransmitting antenna with an amplifier used as an amplifying unit and a transmitting unit in a gap filler device that retransmits the retransmitted signal to the indoor receiving antenna by the transmitting unit. A cylindrical body that can be attached to a known lighting fixture for indoor installation and that has a built-in amplifier, and an antenna element that is provided in the cylindrical body and radiates a retransmission signal from the amplifier outside the cylindrical body. It is intended to provide.

  According to this configuration, a stable retransmitted wave can be radiated indoors by providing the amplifying unit in the cylinder.

  As described above in detail, according to the present invention, it is not necessary to secure a separate installation space indoors, and it is easy to install and maintain, and with a retransmission antenna and an amplifier that can realize a stable reception environment indoors. A retransmission antenna can be provided.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
FIG. 1 is a block diagram showing a configuration of a gap filler device according to the present invention.
In FIG. 1, a terrestrial digital broadcast wave coming from a transmitting station is received by a receiving antenna 11 installed outdoors, and the received signal is supplied to a retransmitting antenna 13 installed indoors via a coaxial cable 12. . Then, the retransmission antenna 13 radiates the input received signal as a retransmission wave indoors.
Then, the television receiver 21 installed indoors receives the retransmitted wave with a known simple receiving antenna 22 and reproduces and displays the broadcast content.

(First embodiment)
1st Embodiment of this invention is related with the re-transmission antenna 13 of the said gap filler apparatus.
FIG. 2 is a diagram showing a circuit structure of the retransmitting antenna 13 integrated with the lighting fixture, and FIG. 3 is a diagram showing a cross section of the lighting fixture.
Reference numeral 31 denotes a cylindrical fluorescent tube used in general homes, trains, and the like, and an LED array 32 composed of a plurality of LEDs (Light Emitting Diodes) is built therein. The fluorescent tube 31 can be detachably attached to, for example, fluorescent tube mounting devices 341 and 342 already provided on an indoor ceiling by connecting pins 331, 332, 333, and 334 provided at both ends thereof. .

  The LED array 32 is converted into a DC voltage by rectifying the AC voltage (100 V) applied via the connection pins 331 and 334 and the choke coil 72 by the rectifier circuits 42 and 45, and this DC voltage is converted into the resistance 35. , 36 to light up and illuminate the interior. When this AC voltage is input, the current flows in a closed loop by the connection pins 331 and 334, the rectifier circuits 42 and 45, the LED array 32, and the resistors 35 and 36. Note that the DC voltage applied to the LED array 32 is stabilized by the ballast 43 and supplied via the choke coil 71. Further, the lighting tube 41 and the noise prevention capacitor 40 are connected in parallel between the connection pin 332 and the connection pin 333.

  In addition, the fluorescent tube 31 incorporates antenna elements 131 and 132 constituting the retransmission antenna 13. The current from the central conductor of the coaxial cable 12 is supplied to the antenna element 131 via the capacitor 38 and the connection pin 332, but the choke coil 39 prevents the current from flowing to the lighting tube 41 and the noise prevention capacitor 40. Is blocking. The current from the connection pin 331 is supplied to the antenna element 132 through the capacitor 44. Each current flows as a feeding current to the open ends of the antenna elements 131 and 132, but a part of the current is reflected at the open ends, and a part of the current flows along the shape of the antenna element 131 and operates as an antenna. Note that the antenna element 132 may have a cylindrical shape surrounding the antenna element 131 (sleeve antenna).

The length of the antenna element 131 can be realized by about ½ wavelength of the signal current flowing through the antenna element 131, and the length of the antenna element 132 can be realized by about ¼ wavelength of the signal current flowing through the antenna element 132.
Next, the operation in the above configuration will be described.
First, the receiving antenna 11 is mounted outdoors, and the coaxial cable 12 is laid from the receiving antenna 11 to the indoor fluorescent tube mounting device 341. The fluorescent tube in which the antenna elements 131 and 132 are built in the fluorescent tube mounting devices 341 and 342. 31 is fitted.

As a result, the received signal from the receiving antenna 11 is fed to the antenna element 131 via the coaxial cable 12, the capacitor 38, and the connection pin 332. Then, the antenna element 131 radiates the fed reception signal toward the indoors as a retransmitted wave.
As described above, in the first embodiment, the antenna elements 131 and 132 constituting the re-transmission antenna 13 are attached to the fluorescent tube mounting fixtures 341 and 342 together with the LED array 32 by using the lighting fixture installed indoors. A possible fluorescent tube 31 is provided.

Therefore, it is not necessary to separately secure an installation space for the retransmission antenna 13 indoors, and the relatively small and inexpensive retransmission antenna 13 can be provided.
Further, when the antenna elements 131 and 132 fail, the fluorescent tube 31 containing the failed antenna elements 131 and 132 is detached from the fluorescent tube mounting devices 341 and 342, and the fluorescent tube 31 containing the normal antenna elements 131 and 132 is installed. Is only required to be attached to the fluorescent tube attaching devices 341 and 342, and installation / maintenance work becomes easy.

Furthermore, since the signal line for transmitting the signal from the coaxial cable 12 and the power supply wiring are shared by the connection pins 331 and 332, the wiring structure can be simplified.
(Second Embodiment)
The second embodiment of the present invention relates to the retransmission antenna 13 of the gap filler device.

FIG. 4 is a diagram showing a circuit structure of the retransmission antenna 13 integrated with a lighting fixture. In FIG. 4, the same parts as those in FIG.
The fluorescent tube 31 incorporates a sleeve type antenna 133 and a high frequency amplifier 14. The fluorescent tube 31 is provided with connection pins 511 and 512 on the central axes at both ends thereof. In this case, since the fluorescent tube 31 cannot be attached to the fluorescent tube attaching device as it is, it can be attached to the fluorescent tube attaching device via the connection pins 531, 532, 533 and 534 by the adapters 521 and 522.

  The fluorescent tube 31 has a built-in LED array substrate 54. For example, a plurality of four LEDs are arranged in parallel on the LED array substrate 54. The LED array board 54 includes coils 551-1 to 55n-1, 551-2 to 55n-2, 551-3 to 55n at intervals smaller than about ¼ wavelength of the high-frequency signal current flowing through the sleeve antenna 133. -3 is inserted and connected.

  The plurality of LEDs on the LED array board 54 are converted into a DC voltage by rectifying the AC voltage (100 V) applied via the connection pin 531, the adapter 521, and the connection pin 511 by the rectifier circuit 56. When a DC voltage is applied, it lights up and illuminates the interior. When this AC voltage is input, the current flows in a closed loop formed by the connection pins 511, 512, 531, 534, the rectifier circuit 56, and the LED array substrate 54.

The power supplied to the connection pin 511 is supplied to the rectifier circuit 56 and is also supplied to the high frequency amplifier 14. Thereby, simplification of power supply wiring can be achieved.
In addition to the connection pins 511 and 512, the fluorescent tube 31 is provided with a connection terminal 57 for connecting the coaxial cable 12 and the high-frequency amplifier 14.

Next, the operation in the above configuration will be described.
First, the receiving antenna 11 is attached outdoors, and the coaxial cable 12 is laid from the receiving antenna 11 indoors. Then, the fluorescent tube 31 incorporating the high frequency amplifier 14 and the sleeve type antenna 133 is attached to the fluorescent tube attaching device via the adapters 521 and 522, and then the coaxial cable 12 is connected to the connection terminal 57 provided on the fluorescent tube 31. Is done.

  As a result, the received signal from the receiving antenna 11 is supplied to the high frequency amplifier 14 via the coaxial cable 12 and the connection terminal 57. The high frequency amplifier 14 amplifies the received signal to a required signal level to generate a retransmission signal, and supplies the retransmission signal to the sleeve antenna 133. This sleeve type antenna 133 radiates the retransmitted signal indoors as a retransmitted wave by the quarter wavelength sleeve 134.

  At this time, since the high-frequency amplifier 14 and the rectifier circuit 56 are located away from the quarter-wave sleeve 134, the radiation characteristics of the sleeve-type antenna 133 are not affected. Further, since the wiring for turning on the LED and the power supply line are longer than λ / 4, the radiated radio wave is affected by this wiring. In this embodiment, the sleeve type antenna 133 is provided in the middle of the wiring circuit of the LED array substrate 54. The coils 551-1 to 55 n-1, 551-2 to 55 n-2, and 551-3 to 55 n-3 are inserted and connected at intervals smaller than about ¼ wavelength of the high-frequency signal current flowing through the Therefore, the radiated radio wave is not affected by the LED array substrate 54.

  As described above, in the second embodiment, the same effects as in the first embodiment can be obtained, and the high-frequency signal current flowing in the LED array substrate 54 can be reduced to 1 / of the high-frequency signal flowing in the sleeve antenna 133. The plurality of coils 551-1 to 55 n-1, 551-2 to 55 n-2, and 551-3 to 55 n-3 are inserted at intervals of 4 wavelengths or less. Therefore, the retransmitted wave radiated from the sleeve type antenna 133 is not affected by the LED array substrate 54.

In the second embodiment, since the high frequency amplifier 14 is provided in the fluorescent tube 31, a stable retransmitted wave can be radiated indoors.
Furthermore, in the second embodiment, since the connection terminal 57 for connecting the coaxial cable 12 and the high frequency amplifier 14 is provided separately from the connection pins 511 and 512, the influence of the power supply wiring can be reduced.

In the second embodiment, the connection pins 511 and 512 for supplying power are provided on the central axis of the fluorescent tube 31, so that the rotation of the LED can be adjusted so that the light from the LED can be blown in the front direction. is there.
(Third embodiment)
The third embodiment of the present invention relates to the retransmission antenna 13 of the gap filler device.
FIG. 5 is a diagram showing a circuit structure of the retransmitting antenna 13 integrated with the lighting fixture, and FIG. 6 is a diagram showing a cross section of the lighting fixture. In FIG. 5, the same parts as those in FIG.

In the third embodiment, a sleeve type antenna 63 is mounted together with a plurality of LEDs 62 on a printed circuit board 61 in the fluorescent tube 31. The coaxial cable 12 and the sleeve type antenna 63 are connected via the connection terminal 57.
Further, the fluorescent lamp reflector 64 is disposed on the back side of the printed board 61 on the surface where the sleeve type antenna 63 is mounted. Further, a normal fluorescent tube 65 is disposed next to the fluorescent tube 31.

The fluorescent lamp reflector 64 is efficient because it also operates as a reflector (radio wave reflector) of the sleeve type antenna 63 and does not radiate radio waves in unnecessary directions.
As described above, according to the third embodiment, the same effects as those of the second embodiment can be obtained, the internal wiring structure can be simplified, and a stable reception environment can be obtained indoors. Furthermore, since the fluorescent lamp reflector 64 is used to achieve unidirectionality indoors, the electric field strength at the reception point can be increased.

(Other embodiments)
The present invention is not limited to the above embodiments. For example, in the second and third embodiments, the example using the sleeve-type antenna has been described. However, a retransmission antenna using another type of antenna element may be used.

Moreover, although each said embodiment demonstrated the example which incorporates LED and an antenna element in a fluorescent tube, only an antenna element may be sufficient.
In each of the above embodiments, a general household has been described as an example, but it can also be installed on a moving body such as a train.
In addition, the type and configuration of the re-transmission antenna, the shape and type of the fluorescent tube, the wiring structure in the fluorescent tube, and the like can be variously modified without departing from the scope of the present invention.

The block diagram which shows the structure of the gap filler apparatus which concerns on this invention. The figure which shows the circuit structure in the fluorescent tube in which the retransmission antenna concerning the 1st Embodiment of this invention is incorporated. The figure which shows the cross section of the fluorescent tube in which the retransmission antenna is incorporated in the said 1st Embodiment. The figure which shows the circuit structure in the fluorescent tube in which the retransmission antenna concerning the 2nd Embodiment of this invention is incorporated. The figure which shows the circuit structure in the fluorescent tube in which the retransmission antenna concerning the 3rd Embodiment of this invention is incorporated. The figure which shows the cross section of the fluorescent tube in which the re-transmission antenna is incorporated in the said 3rd Embodiment.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 11 ... Reception antenna, 12 ... Coaxial cable, 13 ... Retransmission antenna, 14 ... High frequency amplifier, 21 ... Television receiver, 22 ... Simple reception antenna, 31 ... Fluorescent tube, 32 ... LED array, 35, 36 ... Resistance, 37, 38, 40, 44 ... capacitor, 39, 551-1 to 55n-1, 551-2 to 55n-2, 551-3 to 55n-3 ... coil, 41 ... lighting tube, 42, 45, 56 ... Rectifier circuit, 43 ... ballast, 54 ... LED array board, 57 ... connection terminal, 61 ... printed circuit board, 62 ... LED, 63, 133 ... sleeve type antenna, 64 ... fluorescent lamp reflector, 65 ... normal fluorescent tube, 131, 132 ... Antenna element, 134 ... 1/4 wavelength sleeve, 331, 332, 333, 334 ... Connection pin, 341, 342 ... Fluorescent tube mounting device, 511, 512 ... Connection Down, 521 and 522 ... adapter, 531, 532, 533, 534 ... connection pin.

Claims (9)

Used to receive a terrestrial digital broadcast wave with a known indoor receiving antenna installed in a broadcast receiver. The terrestrial digital broadcast wave is received by a receiving unit installed outdoors, and this received signal is transmitted to a transmitting unit. A retransmission antenna used as the transmission unit in a gap filler device that retransmits toward the indoor reception antenna,
A built-in light emitting element, a fluorescent tube cylindrical emitting driving the light emitting element mounted on the known luminaire for indoor installation,
Provided in the fluorescent inner tube, and an antenna element for retransmitting the digital terrestrial broadcasting wave to the indoor,
A re-transmission antenna, comprising: signal supply means for supplying a signal of a terrestrial digital broadcast wave received by the receiving unit to the antenna element . The retransmission antenna according to claim 1, wherein the antenna element is a sleeve-type antenna. The re-transmission antenna according to claim 1, wherein the signal supply means supplies the reception signal to the antenna element via an attachment device for the lighting fixture. The retransmission antenna according to claim 1, wherein the signal supply means supplies the reception signal to the antenna element via a connection terminal provided in the fluorescent tube . When a plurality of the light emitting elements are mounted on the fluorescent tube and a wiring board serving as a circuit for causing the plurality of light emitting elements to emit light is disposed,
The wiring board further includes a frequency blocking means for blocking a high-frequency signal flowing on the wiring board by a plurality of coils inserted at intervals of ¼ wavelength or less of a signal current flowing through the antenna element. The retransmission antenna according to claim 1 . The fluorescent tubes, according to claim 1, over the previous SL luminaire mounted so as to be rotatable, characterized in that a connection pin to a power source section for generating a power in order to emit the light emitting element at both ends Retransmission antenna as described. The retransmission antenna according to claim 6 , further comprising an adapter that relays connection between the electrode of the light emitting element and the connection pin. The re-transmission antenna according to claim 1, wherein a connection terminal for connecting the antenna element to the receiving unit is provided on the fluorescent tube . The re-transmission according to claim 1, further comprising a reflector, wherein a terrestrial digital broadcast wave radiated from the antenna element is reflected by the reflector so that a directivity direction is directed indoors. antenna.

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