JP2006345238A - Terrestrial broadcast receiver - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve the problem that it is necessary to separately install an indoor antenna to easily receive a terrestrial broadcast in a region where the intensity of an electric field is intense and that degradation in reception quality needs to be eliminated since the indoor antenna receives unnecessary radiation from a terrestrial broadcast receiver. <P>SOLUTION: A planar antenna 31 comprising a metal housing 34 containing a tuner receiving the terrestrial broadcast wave and a printed board 36 arranged outside a housing bottom surface 37 in parallel across a dielectric 35 is constituted in one body and then the housing bottom surface operates as a grounding flat plate of the antenna and also operates as a shield plate against unnecessary radiation generated in the housing, so an antenna-incorporated terrestrial broadcast receiver can be constituted while deterioration in receiving performance is reduced. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a receiving apparatus (international patent classification H04N17 / 00) used for terrestrial broadcasting.

  In general, except for cable television, when receiving terrestrial broadcasts, a VHF or UHF band receiving antenna is installed outdoors and connected to a terrestrial broadcast receiver via a coaxial cable. In particular, there are cases where indoor antennas are simply used in areas where the electric field strength of broadcast waves is strong.

  On the other hand, there are not many examples in which an antenna is incorporated in a terrestrial broadcast receiver such as a television or a stationary terrestrial broadcast receiver (set-top box), and in particular, it is described in Patent Document 1 in FIG. An example of a conventional television receiver with a built-in antenna is shown.

In FIG. 6, an antenna structure 62 has a first antenna loop unit 63 for receiving UHF band broadcasts and a second antenna loop unit 64 for receiving VHF band broadcasts housed in a housing 61 of a television receiver. It was used as an indoor antenna by pulling it out from the inside of the housing 61 in accordance with each broadcast wave reception.
JP 59-21205 A

  However, in the conventional configuration, since it is necessary to pull out the antenna from the television receiver, there are a number of problems in terms of troublesome work, securing an antenna space, appearance, and safety. Further, since the antenna has a directivity in a direction perpendicular to the arrival direction of the broadcast wave, there is a problem that the reception capability is lowered. For this reason, there is a problem that it is necessary to install an antenna separately in the end.

  Furthermore, since unnecessary radiation having various frequency components generated by the power supply and electronic circuit inside the receiver is received and mixed into the tuner, the reception quality is deteriorated or cannot be received like a general indoor antenna. Had problems.

  The present invention solves the above-mentioned conventional problems, and an object thereof is to provide a terrestrial broadcast receiver that eliminates the need for separately installing an antenna and reduces a decrease in reception quality due to unnecessary radiation.

  In order to solve the above-described conventional problems, a terrestrial broadcast receiver according to the present invention includes a metal casing having a tuner for receiving a terrestrial broadcast wave, and a planar antenna element parallel to one surface of the casing. And an antenna provided between the one surface of the housing and the dielectric sandwiched between the antennas, and the ground of the feeding portion of the antenna is connected to any surface of the housing or the tuner. It is characterized by a structure that takes the outer conductor of the input terminal.

  In addition, the antenna includes an antenna element having one surface acting as a reflector and having directivity perpendicular to the one surface of the housing.

  Furthermore, the antenna includes an antenna element having directivity parallel to one surface of the housing.

  Further, the present invention is characterized in that a metal surface perpendicular to one surface of the housing is provided as a reflection plate on the side opposite to the arrival direction of the broadcast wave with respect to the antenna.

  As a result, since the housing surface of the terrestrial broadcast receiver unit can be used as a reflector and a shielding plate, the terrestrial broadcast receiver unit and the antenna unit can be integrated to receive broadcast radio waves efficiently and with little deterioration. it can.

  According to the terrestrial broadcast receiver of the present invention, by adopting a configuration in which an antenna is integrated with a conventional terrestrial broadcast receiver, there is no need to separately install an antenna, and terrestrial broadcast that reduces a decrease in reception quality due to unnecessary radiation. A receiver can be provided.

The best mode for carrying out the present invention will be described below with reference to the drawings.
(Embodiment 1)
1 is a perspective view of a terrestrial broadcast receiver according to Embodiment 1 of the present invention, and FIG. 2 is a cross-sectional view of the terrestrial broadcast receiver according to Embodiment 1. 1 and 2, a planar (planar) antenna element 11 is formed with a dielectric 15 sandwiched outside a bottom surface 16 of a housing 14 made of a metal containing a tuner for receiving a terrestrial broadcast wave. An antenna is provided, and the antenna feeding portion is connected to a tuner input terminal in the housing 14 via the coaxial cable 13. In this case, the ground is provided on the outer conductor or the housing surface of the tuner input terminal. The antenna is integrated with the receiver unit.

  The antenna is formed of a printed circuit board 16 and has a shape having directivity in a direction perpendicular to the bottom surface 17 of the housing, such as the illustrated loop antenna, and is covered with a dielectric cover 12.

  According to such a configuration, since the dielectric 15 is sandwiched between the antenna element 11 and the casing bottom surface 17, the wavelength shortening effect of the dielectric is expected, so that the antenna can be reduced in size and the thickness thereof. By adjusting the above, the bottom surface 17 of the housing can act as a reflecting plate or a ground plate, and the antenna gain can be improved.

  Further, unnecessary radiation components generated inside the housing 14 incorporating electronic components such as a tuner are mainly radiated from holes such as slits in the housing top surface 18 provided for heat dissipation and the panel surface provided on the side surface of the housing. To do. Therefore, by configuring the antenna on the back side of the bottom surface 17 of the housing, in addition to the effect of improving the performance of the antenna, a shielding effect against unnecessary radiation is produced, and deterioration of reception performance can be reduced.

  In addition, the antenna can be configured as a traveling wave receiving antenna having a kind of microstrip line structure by disposing the antenna parallel to the casing surface via a dielectric. The terrestrial broadcast receiver of the present invention can be installed vertically, and can receive horizontally polarized waves mainly used for terrestrial broadcasts.

  In the present embodiment, the antenna element may be formed of a metal wire instead of the printed board.

Further, an impedance transformer composed of a coil or a capacitor may be inserted between the antenna feeding portion and the coaxial cable for matching.
(Embodiment 2)
3, 4 and 5 are perspective views of a terrestrial broadcast receiver according to Embodiment 2 of the present invention.

  In FIG. 3, the overall structure is the same as in FIG. Here, the top surface 38 of the metal housing 34 is the lower side in the figure. The antenna element 31 formed of the printed circuit board 36 is configured by bending in a zigzag manner at a predetermined angle, and the antenna feeding portion is connected to the tuner input terminal 32 via the coaxial cable 33.

  According to such a configuration, the terrestrial broadcast receiver according to the present invention is described in the first embodiment because it has directivity in the left direction (the arrival direction of the broadcast wave) in the figure by providing the traveling wave antenna. Instead of the vertical installation, it can be a horizontal installation that is generally used. However, in actuality, it is installed upside down in consideration of heat radiation from the top surface.

  Also, as shown in FIG. 4, by providing a metal plate 49 perpendicular to the bottom surface 47 of the housing on the same plane as the side surface of the housing 44, an antenna with a reflector can be configured, so that the antenna gain is improved. Can do.

  Moreover, as shown in FIG. 5, you may use the structure of the Yagi type | mold antenna 51 grade | etc., As a traveling wave type | mold antenna.

  As in the first embodiment, the antenna element may be formed of a metal wire instead of the printed board.

  Further, an impedance transformer composed of a coil or a capacitor may be inserted between the antenna feeding portion and the coaxial cable for matching.

  Since the terrestrial broadcast receiver according to the present invention does not require a separate receiving antenna, it is useful as a simple receiving means in areas where electric field strength is strong.

The perspective view of the terrestrial broadcast receiver in Embodiment 1 of this invention Sectional drawing of the terrestrial broadcasting receiver in Embodiment 1 of this invention A perspective view of a terrestrial broadcast receiver according to Embodiment 2 of the present invention. A perspective view of a terrestrial broadcast receiver according to Embodiment 2 of the present invention. A perspective view of a terrestrial broadcast receiver according to Embodiment 2 of the present invention. Perspective view of a conventional television receiver

Explanation of symbols

10 Terrestrial Broadcasting Receiver 11 Antenna Element 12 Dielectric Cover
DESCRIPTION OF SYMBOLS 13 Coaxial cable 14 Metal housing 15 Dielectric 16 Printed circuit board 17 Housing bottom surface 18 Housing top surface 30 Terrestrial broadcast receiver 31 Antenna element 32 Tuner input terminal 33 Coaxial cable 34 Metal housing 35 Dielectric 36 Printed circuit board 37 Housing bottom surface 38 Top surface of housing 40 Terrestrial Broadcasting Receiver 41 Antenna Element 42 Tuner Input Terminal 43 Coaxial Cable 44 Metal Housing 47 Housing Bottom 48 Housing Top 49 Metal Plate Vertical to Housing Bottom 50 Terrestrial Broadcasting Receiver 51 Yagi Antenna 52 Coaxial Cable

Claims (4)

A housing made of metal containing a tuner for receiving terrestrial broadcast waves;
An antenna including a planar antenna element parallel to one surface of the housing;
A dielectric body sandwiched between one surface of the housing and the antenna is integrated,
A terrestrial broadcast receiver having a structure in which a ground of a feeding portion of the antenna is taken by any surface of the casing or an external conductor of an input terminal of the tuner. The antenna allows one surface of the housing to act as a reflector,
The terrestrial broadcast receiver according to claim 1, further comprising an antenna element having directivity perpendicular to one surface of the housing. The terrestrial broadcast receiver according to claim 1, wherein the antenna includes an antenna element having directivity parallel to one surface of the housing. 4. The terrestrial broadcast receiver according to claim 3, wherein a metal surface perpendicular to one surface of the housing is provided as a reflector on the opposite side of the direction of arrival of the broadcast wave with respect to the antenna.

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