JP2008118353A - Antenna device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an antenna device that can dramatically increase a receiving rate by drastically increasing an antenna direction adjusting angle even when mounted on a wall surface or the like of a veranda. <P>SOLUTION: Mounting parts 26a, 26b and 26c of metal fittings are provided at side parts of the direction of 90° from the maximum directivity direction, such as both side parts and a bottom side part with respect to an antenna main body 21A formed in an almost rectangular planar shape. The mounting parts 26a, 26b and 26c of metal fittings are configured to be able to easily mount/demount metal fitting 40 for mast mounting. The mounting parts 26a, 26b and 26c of metal fitting are selected in accordance with received polarization (horizontal polarization and vertical polarization) and the direction of an incoming radio wave with respect to the antenna main body 21A, and the metal fittings 40 for mast mounting is mounted and further mounted to a mast 17 of metal fittings 15 of a veranda mounted to the wall surface 14 of the veranda. By providing the mounting parts 26a, 26b and 26c of metal fittings at the position of 90° from the maximum directivity direction of the antenna main body 21A and mounting the metal fittings 40 for mast mounting, the maximum directivity direction can be adjusted at the range of about 180°. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an antenna device that receives digital terrestrial broadcasting, for example.

  Conventionally, terrestrial analog TV broadcasts (VHF, UHF) and satellite broadcasts (CS / BS) are performed as TV broadcasts, but more recently digital terrestrial broadcasts (TV broadcasts) have been started. Since terrestrial digital broadcasting uses a high frequency band (470 to 770 MHz) of the UHF band, the antenna can be downsized. For this reason, in general homes, an antenna is attached to a veranda or the like to receive digital terrestrial TV broadcasts.

  Conventional unidirectional antennas for receiving terrestrial digital broadcasts are provided with mounting brackets on the side opposite to the directionality direction, that is, on the back side (see, for example, Patent Document 1).

  FIG. 15 is a rear perspective view showing a mounting state of the mounting bracket in the conventional terrestrial digital broadcast receiving antenna 10. In FIG. 15, reference numeral 11 denotes an antenna body, which houses a radiating element (not shown) in a box-shaped body cover 12. A mast mounting bracket 13 is provided at a substantially central portion on the back side (opposite to the directivity direction) of the antenna body 11.

  When the antenna 10 is attached to, for example, the wall surface 14 of the veranda, first, the veranda metal 15 is attached to the wall surface 14 of the veranda with bolts or the like. The veranda bracket 15 includes a wall mounting portion 16 and an antenna mounting mast 17 formed in a substantially J shape. The mast mounting bracket 13 of the antenna 10 is mounted on the mast 17 and is fastened with bolts or the like. . The mast mounting bracket 13 can be rotated left and right around the mast 17 by loosening a fixing bolt, for example, so that the directivity direction of the antenna can be adjusted.

The arrow a in the front direction of the antenna 10 indicates the maximum directivity direction, and the side arrow b indicates the directivity adjustment range.
Design Registration No. 1235674

  The conventional antenna 10 can adjust the directivity direction within a range indicated by an arrow b by loosening a bolt or the like of the mast mounting bracket 13. However, since the conventional antenna 10 is provided with the mast mounting bracket 13 at the substantially central portion on the back surface of the antenna body 11, when the antenna body 11 is turned left and right when adjusting the directivity direction, the left and right side parts are arranged. May contact the wall surface 14 of the veranda, and the maximum directivity direction may not be adjusted to the radio wave arrival direction. For this reason, the maximum antenna gain cannot be received, and there is a possibility that reception is impossible.

  Further, the conventional antenna 10 has an aesthetic problem because when the indoor stand is attached to the lower side of the antenna body 11, the mast mounting bracket 13 remains attached to the rear surface of the antenna body 11. It has become. In this case, it is conceivable to keep the aesthetic appearance by covering the portion of the mast mounting bracket 13 with a cover member, but there also arises a problem that the cover member increases the antenna and costs.

  The present invention has been made to solve the above-described problems. Even when the antenna is attached to a wall surface of a veranda, the antenna direction adjustment angle can be greatly increased and the reception rate can be dramatically increased. An object of the present invention is to provide an antenna device capable of easily switching between vertical polarizations.

  It is another object of the present invention to provide an antenna device that can be easily used outdoors and indoors without impairing the aesthetics of both horizontally polarized waves and vertically polarized waves.

  An antenna device according to a first aspect of the present invention is provided in an antenna body that is formed in a planar shape and has a maximum directivity direction in a substantially front direction, and a side portion that is positioned approximately 90 ° from the maximum directivity direction of the antenna body. And a mounting bracket.

  An antenna device according to a second invention is formed in a planar shape and has an antenna main body having a maximum directivity direction in a substantially front direction, and at least two intersections located in a direction of approximately 90 ° from the maximum directivity direction of the antenna main body. And a mast mounting bracket provided detachably on the bracket mounting portion.

  According to a third aspect of the present invention, there is provided an antenna device which is formed in a planar shape and has a maximum directivity direction in a substantially front direction, and at least two intersections located in a direction of approximately 90 ° from the maximum directivity direction of the antenna body. And a bracket mounting portion provided on each of the side portions, wherein the bracket mounting portion is detachable from the mast mounting bracket and the indoor stand, and is also used as an outdoor antenna and an indoor antenna.

  According to the present invention, by providing the mounting bracket on the side portion located approximately 90 ° from the direction of maximum directivity of the antenna body, even when the antenna body is mounted on the wall surface of the veranda, the antenna direction adjustment angle can be greatly increased. The reception rate can be dramatically increased.

  In addition, by providing a bracket mounting portion on at least two intersecting side portions located approximately 90 ° from the direction of maximum directivity of the antenna body, and selecting the bracket mounting portion and mounting a mast mounting bracket, horizontal polarization Both reception and vertical polarization reception can be easily handled.

  Also, at least two intersecting sides located approximately 90 ° from the direction of maximum directivity of the antenna body are provided with bracket mounting portions, respectively, and the bracket mounting portion is configured to be detachable from the mast mounting bracket and the indoor stand. By doing so, both outdoor and indoor antennas can be easily used without damaging the design of both horizontally polarized waves and vertically polarized waves.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

(First embodiment)
FIG. 1 shows a configuration of an antenna main body portion of a UHF band receiving antenna device according to a first embodiment of the present invention, where (a) is a front view, (b) is a left side view, and (c) is a right side view, (D) is a lower side view. 2 is a perspective view when an outdoor antenna is configured by attaching a mast mounting bracket to the antenna body, FIG. 3 is an exploded perspective view for explaining the mounting structure of the mast mounting bracket, and FIG. 4 is an internal configuration example of the antenna body. It is a partial sectional view shown.

  In FIG. 1 and FIG. 2, reference numeral 21 denotes an antenna body, which includes a radiating element portion 22 and a reflecting plate portion 23, and a coupling portion 24 that couples both is provided between the radiating element portion 22 and the reflecting plate portion 23. The radiating element portion 22 is provided with a radiating element in a synthetic resin main body cover 25a, and the reflecting plate portion 23 is provided with a reflecting plate in a synthetic resin main body cover 25b. For example, the radiating element portion 22 and the reflecting plate portion 23 are formed in a rectangular shape on the front side. In addition, the radiating element portion 22 and the reflecting plate portion 23 are formed in a mountain shape so that, for example, the opposite central portions are elevated when viewed from above as shown in FIG. Details of the internal configurations of the radiating element 22 and the reflector 23 will be described later.

  The coupling portion 24 is formed in a box shape from a synthetic resin member, and holds the radiation element portion 22 and the reflection plate portion 23 at a predetermined interval. The coupling part 24 is divided between the radiating element part 22 and the reflecting plate part 23 so that the radiating element part 22 and the reflecting plate part 23 can be separated. In addition, the left and right side portions and the lower side portion of the coupling portion 24 are formed to be lower by a certain distance, for example, about 20 to 30 mm from the side edges of the reflecting plate portion 23 and the reflecting plate portion 23, and the upper portion is further lowered by several times. Is done. Note that the height of the upper portion of the coupling portion 24 may be set to the same value as that of both side portions and the lower side portion.

  Further, as shown in FIGS. 2 and 3, the coupling portion 24 is provided with metal mounting portions 26a, 26b, and 26c for detachably mounting the mast mounting metal 40 or the indoor stand as shown in FIGS. . The bracket mounting portions 26a, 26b, and 26c are respectively provided with two bolt holes 27a and 27b for fixing the mast mounting bracket 40 or the indoor stand.

  In addition, the reflector plate 23 is provided with an antenna output plug 28 at the lower left corner facing the radiating element 22, for example. The radiating element portion 22 is provided with, for example, an arc-shaped notch 29 at a lower corner portion facing the antenna output connector 28. The notch 29 is provided so that the lower side of the radiating element portion 22 does not get in the way when an external power supply coaxial cable is connected to the antenna output plug 28.

  Next, details of the mast mounting bracket 40 and its mounting structure will be described with reference to FIG. FIG. 3 is an exploded perspective view showing the details of the mast mounting bracket 40, with the radiating element portion 22 removed and the reflecting plate portion 23 viewed from the inside.

  For example, an octagonal partition wall 31 is provided inside the coupling portion 24 on the reflecting plate portion 23 side. Inside the partition wall 31, the main body cover 25 b is opened, and a reflection plate 61 described later can be seen. A similar partition is also provided at the coupling portion 24 on the radiating element portion 22 side. Further, in the vicinity of the four corners inside the coupling portion 24, screw bosses 32 a to 32 d are provided between the coupling portion 24 and the partition wall 31. The screwing bosses 32a to 32d are for fixing the radiating element 22 and are provided with screw holes in the upper part.

  The bracket mounting portions 26a, 26b, and 26c have a double structure so as to sandwich the side wall of the coupling portion 24, and bracket fixing bolt receivers 33a and 33b are provided at inner positions corresponding to the bolt holes 27a and 27b. .

The mast mounting bracket 40 that is selectively mounted on the bracket mounting portions 26a, 26b, and 26c includes a mast mounting bracket body 41 and a mast band 42.
The mast mounting bracket main body 41 is provided with bolt holding portions 43a and 43b at predetermined intervals in the vertical direction, that is, corresponding to the bolt holes 27a and 27b provided in the bracket mounting portions 26a, 26b and 26c. The bolt holding portions 43 a and 43 b are set to a size that can be inserted between the radiating element portion 22 and the reflecting plate portion 23. Mast mounting bracket fixing bolts 44a and 44b are inserted into the bolt holding portions 43a and 43b from the outside, and the tips thereof are screwed into the bolt holes 27a and 27b of the bracket mounting portions 26a, 26b and 26c. It has become.

  In addition, holding plates 45 a and 45 b are provided on the left and right side portions of the mast mounting bracket main body 41. When the mast mounting bracket 40 is mounted on the bracket mounting portions 26a, 26b, and 26c, the holding plates 45a and 45b are in contact with the outside of the radiating element portion 22 and the reflecting plate portion 23 to stabilize the mast mounting bracket body 41. Hold on.

  Further, the mast mounting bracket body 41 is provided with bolt insertion holes (not shown) in the vicinity of both sides of the central portion, that is, inside the holding plates 45a and 45b. The U-shaped bolt 46 is inserted, and the tip thereof is further inserted into bolt insertion holes 47 a and 47 b provided in the mast band 42. Then, wing nuts 48a and 48b are screwed onto the tips of the U-shaped bolts 46 led out from the bolt insertion holes 47a and 47b of the mast band 42.

  The mast band 42 is provided with a concave portion 49 in the central portion on the side facing the mast mounting bracket main body 41 on the upper and lower side plates. The recess 49 is formed with a plurality of projections and depressions for securely holding the mast. In addition, the mast mounting bracket body 41 is provided with a recess 50 for holding the mast at the upper portion on the side facing the mast band 42 and the central portion of the lower side plate. A mast is interposed between the recess 50 of the mast mounting metal body 41 and the recess 49 of the mast band 42, and the mast is held by tightening with wing nuts 48a and 48b.

  When the antenna body 21A is used for horizontal polarization reception, the mast mounting bracket 40 is mounted on the bracket mounting portion 26a or the bracket mounting portion 26b provided on the side of the antenna body 21A, and the antenna body 21A is vertically polarized. When used for reception, it is attached to a bracket mounting portion 26c provided on the lower side of the antenna body 21A. For example, when the mast mounting bracket 40 is mounted on the bracket mounting portion 26a provided on the side of the antenna device as shown in FIGS. 2 and 3, the front ends of the bolt holding portions 43a and 43b of the mast mounting bracket 40 are mounted on the bracket. The mast mounting bracket fixing bolts 44a and 44b are inserted into the bolt holding portions 43a and 43b, and their tips are screwed into the bolt holes 27a and 27b of the bracket mounting portion 26b and fixed. To do.

Next, an internal configuration example of the radiating element portion 22 and the reflecting plate portion 23 of the antenna body 21A will be described with reference to FIG.
In FIG. 4, reference numeral 51 denotes a radiating element provided in the radiating element unit 22, and a reflecting plate 61 is disposed opposite to the back surface of the radiating element 51 with a predetermined interval, for example, about 0.135λ (λ is a wavelength at the used frequency). Is done. In the radiating element 51, two loop-shaped elements 52a and 52b formed of a plate-like conductive member are arranged at a predetermined interval in the vertical direction within the same plane, and are coupled by a coupling line 53 to be substantially Z-shaped. Formed. The two loop-shaped elements 52a and 52b are a linear element 54 having a predetermined width formed on both outer sides in the vertical direction, and a side element having a predetermined width formed by bending both ends of the linear element 54 by approximately 90 °. 55 and formed symmetrically. The loop-shaped element 52a has a shape in which a U-shape is rotated 90 ° counterclockwise, and the loop-shaped element 52b has a shape in which the U-shape is rotated 90 ° clockwise.

  The coupling line 53 has a shape obtained by bending the end of the side element 55 of each of the loop elements 52a and 52b by a predetermined angle smaller than 90 °, for example, about 40 °, and is formed in a substantially X shape. At the same time, a groove 56 is provided in the vertical direction of the central portion. Further, in the coupling line 53, power feeding convex portions 57a and 57b are formed at the center of the groove 56, and power feeding points 58a and 58b are provided on the power feeding convex portions 57a and 57b. In the present embodiment, the width of the coupling line 53 gradually increases from the side element 55 to the groove 56.

  Further, the outer shape of the lower radiating element composed of the loop-shaped element 52b is symmetrical with the outer shape of the upper radiating element composed of the loop-shaped element 52a.

  The inner shape of the upper radiating element is such that the lateral width of the lower portion of the linear element 54 is larger than the lateral width of the groove 56 of the feeding point portion, and gradually increases from the feeding point portion or the vicinity thereof toward the linear element 54. It has become. In FIG. 4, the structure gradually increases from the upper end of the groove 56 toward the side element 55. That is, the inner shape of the upper radiating element is such that the lower part of the linear element 54 is the upper side, the inner side of the side element 55 is the side, the inner side of the coupled line part is the inclined side inclined inward, and the vertical direction is below it. The groove 56 has a substantially funnel shape. The inner shape of the lower radiating element is symmetrical with the inner shape of the upper radiating element.

  In the radiating element 51 formed as described above, the total length in the vertical direction is set to about 0.8λ, and the length of the linear element 54 constituting the loop-shaped elements 52a and 52b is set to about 0.5λ. In the loop-shaped elements 52a and 52b, the element width of the linear element 54 is set to about 0.08λ, and the element width of the side element 55 is set to about 0.1λ. Furthermore, the left and right center element width of the groove 56 in the coupled line 53 is set to about 0.05λ.

  The reflector 61 provided in the reflector 23 is a metal plate formed in a square shape, for example, having a total length of about 0.85λ and a total width of about 0.6λ, that is, the total length of the radiating element 51 ( About 0.8λ) and slightly larger than the full width (about 0.5λ).

  The feeding points 58 a and 58 b of the radiating element 51 are connected to the antenna output plug 28 provided on the reflector 23 by a feeding cable 62. In this case, the power feeding cable 62 is held by the holding members 63 a and 63 b at the lower left portion on the reflector 61, the lower end is connected to the antenna output plug 28, and the upper end is an opening inside the partition wall 31 of the coupling portion 24. Further, it is introduced into the radiating element portion 22 and connected to the feeding points 58 a and 58 b of the radiating element 51.

  The antenna body 21A receives horizontal polarized waves when the loop-shaped elements 52a and 52b are arranged vertically as shown in FIG. 4, and from the state shown in FIG. 4 clockwise or counterclockwise in the same plane. In the state rotated 90 °, the vertically polarized wave is received.

  Of course, the antenna body 21A is not limited to the configuration shown in FIG. 4 and may have other configurations.

  Next, a description will be given of a case where the antenna main body 21A is mounted on, for example, a wall surface of a veranda and the maximum directivity direction is adjusted to coincide with the radio wave arrival direction.

  First, as shown in FIG. 5, the veranda metal fitting 15 is attached to the wall surface 14 of the veranda by screwing or the like. As described above, the veranda metal fitting 15 is constituted by the wall mounting portion 16 and the antenna mounting mast 17 formed in a substantially J shape.

  When the antenna main body 21A is used for horizontal polarization reception, as shown in FIGS. 2, 3, and 5, it is 90 ° from the side of the antenna main body 21A, that is, from the maximum directivity direction (front direction indicated by arrow a). The mast mounting bracket 40 is mounted on the bracket mounting portion 26a or the bracket mounting portion 26b provided at the position. 2, 3 and 5 show the case where the mast mounting bracket 40 is attached to the bracket mounting portion 26b provided on the right side when viewed from the front of the antenna body 21A.

  Then, the mast mounting bracket body 41 and the mast band 42 of the mast mounting bracket 40 mounted on the antenna body 21A are mounted on the mast 17 of the veranda bracket 15 as shown in FIG. 5, and the wing nuts 48a and 48b are tightened. Fix it. In this case, by loosening the wing nuts 48a and 48b, the antenna body 21A and the mast mounting bracket 40 can be rotated in the horizontal direction around the mast 17, and the maximum directivity direction indicated by the arrow a can be adjusted.

  As described above, since the mast mounting bracket 40 is attached to the antenna main body 21A at a position 90 ° from the maximum directivity direction, the antenna main body 21A can be rotated to a position parallel to the wall surface 14 of the veranda. The directivity direction can be adjusted at a very wide angle. When the mast mounting bracket 40 is attached to the bracket mounting portion 26b on the right side of the antenna body 21A, the maximum directivity direction is as shown in FIG. 5 (b) from the direction perpendicular to the wall surface 14 of the veranda as shown in FIG. ), It can be adjusted to a range rotated approximately 90 ° counterclockwise, that is, a range parallel to the right side with respect to the wall surface 14 of the veranda. When the directivity is adjusted in the opposite direction to the case of FIGS. 5A and 5B, the metal fitting 26a on the left side of the antenna body 21A is adjusted as shown in FIGS. 6A and 6B. A mast mounting bracket 40 is attached. In this case as well, the directivity direction can be adjusted within a range of approximately 90 ° by adjusting the mounting angle of the mast mounting bracket 40 as in the case of FIGS. 5 (a) and 5 (b).

  As described above, the mast mounting bracket 40 can be attached to and detached from the bracket mounting portions 26a and 26b provided on the left and right sides of the antenna body 21A, so that the maximum directivity direction of the antenna body 21A is in a range of about 180 °. The maximum directivity direction can be surely adjusted to the arrival direction of radio waves. For this reason, it becomes possible to receive at the maximum antenna gain, and the reception rate can be dramatically increased.

  In the description of FIGS. 5 and 6, the case where the mast mounting bracket 40 is replaced with the bracket mounting portions 26a and 26b provided on both sides of the antenna body 21A is shown. Even if only one of them is used and the top and bottom are interchanged, it is possible to adjust the positive directivity within a range of about 180 °.

  When the antenna body 21A receives vertically polarized waves, the mast mounting bracket 40 is attached to the bracket mounting portion 26c provided on the lower side of the antenna body 21A as shown in FIGS. It is attached and attached to the veranda fitting 15 to adjust the directionality direction. The adjustment range of the directivity direction in this case is approximately 90 ° as in the case of horizontal polarization. However, in the case where the directivity direction cannot be adjusted within this range, FIGS. 8A and 8B show. As shown, the antenna body 21A is turned upside down, the mast mounting bracket 40 is mounted on the bracket mounting portion 26c, and is mounted on the veranda bracket 15 to adjust the directionality direction.

  As shown in FIGS. 7 and 8, the antenna main body 21A is turned upside down and the mast mounting bracket 40 is mounted, so that the directivity direction can be adjusted within a range of about 180 °, and the maximum directivity direction is achieved. Can be reliably adjusted to the direction of arrival of radio waves.

(Second Embodiment)
Next, an antenna device according to a second embodiment of the present invention will be described.
In the second embodiment, as shown in FIG. 9, an indoor antenna is configured by attaching an indoor stand 70 to the antenna body 21A shown in the first embodiment instead of the mast mounting bracket 40. .

  FIG. 9 shows details of the indoor antenna stand mounting structure and the indoor stand 70 according to the second embodiment. The exploded perspective view of the antenna body 21A with the radiating element 22 removed and the reflector 23 viewed from the inside. It is. Since the antenna body 21A has the same structure as that shown in the first embodiment, the same parts are denoted by the same reference numerals and detailed description thereof is omitted.

In FIG. 9, metal fittings 26a, 26b, and 26c serve as both the mast fitting 40 and the indoor stand 70, and have the same configuration as that of the first embodiment.
The indoor stand 70 includes a stand base 71 formed in a trapezoidal shape by, for example, a synthetic resin, and an antenna mounting portion 72 provided at the upper center of the stand base 71. The width of the antenna mounting portion 72 is set to a value that can be inserted between the radiating element portion 22 and the reflecting plate portion 23. Bolt insertion holes 73a and 73b are formed in the antenna attachment portion 72 at positions corresponding to the bolt holes 27a and 27b provided in the metal fitting attachment portions 26a, 26b and 26c, and a stand is provided in the bolt insertion holes 73a and 73b. The stand fixing bolts 74a and 74b are inserted from the bottom. The stand fixing bolts 74a and 74b inserted into the bolt insertion holes 73a and 73b have their tips protruding from the bolt insertion holes 73a and 73b by a predetermined length, and bolt holes 27a provided in the bracket mounting portions 26a, 26b and 26c, It can be screwed to 27b.

  When the indoor antenna is used for horizontal polarization reception, the indoor stand 70 is attached to the bracket mounting portion 26c provided on the lower side of the antenna main body 21A, and the antenna is used for vertical polarization reception. The indoor stand 70 is attached to the metal fittings 26a and 26b provided on the left and right sides of the main body 21A.

  FIG. 10 is a perspective view in the case where the indoor stand 70 is attached to the metal fitting attaching portion 26c provided on the lower side of the antenna main body 21A to obtain an indoor antenna for horizontal polarization reception.

  FIG. 11 is a perspective view in the case where the indoor stand 70 is attached to the metal fitting attaching portion 26a provided on the left side of the antenna main body 21A so that the indoor antenna for vertical polarization reception is obtained.

  By attaching the indoor stand 70 in place of the mast mounting bracket 40 to the antenna body 21A as described above, an indoor antenna can be easily obtained.

  In addition, the bracket mounting portions 26a, 26b, and 26c are provided on the side of the antenna main body 21A so that the mast mounting bracket 40 and the indoor stand 70 can be exchanged, thereby preventing a back surface in design. Both horizontal polarization and vertical polarization can be easily used indoors and outdoors without losing the aesthetics of the design.

  In addition, in the indoor antenna, a unidirectional antenna having a half-value width of about 70 ° is used, so that the front of the design is a television installed in the room 80 as shown in FIGS. 12 (a) and 12 (b), for example. Even when matched to the receiver 82 or the like, since the front face on the design is the entire surface, depending on the installation location, there are at least two installation methods, that is, the position a or the position where the surface of the indoor antenna is perpendicular to the television receiver 82 The antenna can be installed at a parallel position b, and is equivalent to an antenna having a combined directivity with a maximum gain of about 6 dB and a minimum gain of -2 dB.

  FIG. 12A shows the indoor environment, and shows a state in which a thin television receiver 82 is installed in a room 80 provided with a window 81. FIG. 12A shows a view of the room 80 from above. The television receiver 82 is installed on the television stand 83. FIG. 12B shows directivities A and B with respect to the installation position of the indoor antenna. The characteristic indicated by the broken line C in FIG. 12B indicates the directivity when the front surface of the conventional omnidirectional antenna design is installed in parallel with the television receiver 82.

  As apparent from FIG. 12, the indoor antenna according to the present embodiment has the conventional antenna directivity made omnidirectional and the design front always kept even when the design front is matched with the television receiver 82. Compared with an antenna that faces the viewer, the reception rate can be dramatically improved.

  In the first and second embodiments, the case where the bracket mounting portions 26a, 26b, and 26c are provided on the three side surfaces of the antenna body 21A has been described. However, the bracket mounting portions are provided on all side surfaces of the antenna body 21A. Also good. Even if the bracket mounting portions are provided on the two intersecting side surfaces of the antenna body 21A, that is, the two adjacent side surfaces so that the mast mounting bracket 40 and the indoor stand 70 can be replaced, horizontal polarization and vertical polarization Both antennas can be used outdoors and indoors without losing the aesthetics of the design.

(Third embodiment)
Next, an antenna device according to a third embodiment of the present invention will be described.

  FIG. 13 is an exploded perspective view showing the configuration of the antenna device (outdoor antenna) according to the third embodiment of the present invention. In the antenna device according to the first embodiment, the antenna body 21A is configured by providing the radiating element portion 22 and the reflector plate portion 23 with the body covers 25a and 25b, respectively. The antenna device according to the third embodiment is illustrated in FIG. As shown in FIG. 13, the antenna body 21 </ b> B is configured by housing the radiating element and the reflection plate in one body cover 90. Since the radiating element and the reflection plate housed in the main body cover 90 have the same configuration as that shown in the first embodiment, detailed description thereof is omitted. When the antenna body 21B is held as shown in FIG. 13, a horizontally polarized radio wave is received.

  The main body cover 90 is formed, for example, in a box shape, and metal fittings 91a to 91d are provided on the upper and lower and left and right side surfaces. A plurality of, for example, four bolt holes 92 are provided in each of the metal mounting portions 91a to 91d. The bracket mounting portions 91a to 91d can be mounted with a mast mounting bracket 93, a cover member 94, or an indoor stand.

  The mast mounting bracket 93 is selectively mounted on the bracket mounting portions 91a to 91d. The mast mounting bracket 93 includes two mounting members 93a and 93b, and four bolts corresponding to the bolt holes 92 of the bracket mounting portions 91a to 91d, respectively. Insertion holes 95 are provided, and fixing bolts 96 are inserted into the respective bolt insertion holes 95 from the outside. The fixing bolt 96 inserted into the bolt insertion hole 95 protrudes from the bolt insertion hole 95 by a predetermined length, and is screwed into, for example, the bolt hole 92 of the metal fitting attachment portion 91a. Further, the mounting members 93a and 93b are formed in semicircular shapes on opposite sides, and the mast 17 of the veranda metal fitting 15 is held in the semicircular portions. A plurality of recesses and projections are formed in the recess 97 to securely hold the mast 17.

  In addition, a rectangular cover member 94 is attached to the other metal attachment parts, for example, 91b to 91c, to which the mast attachment metal 93 is not attached. There are two types of cover members 94, one corresponding to the left and right side surfaces of the main body cover 90 and one corresponding to the upper and lower side surfaces. The cover member 94 is provided with four bolt insertion holes 100 at positions corresponding to the bolt holes 92 of the metal mounting portions 91 a to 91 d, and the fixing bolts 96 are inserted into the bolt insertion holes 100. The fixing bolt 96 inserted into the bolt insertion hole 100 protrudes from the bolt insertion hole 100 by a predetermined length, and is screwed into, for example, the bolt holes 92 of the metal mounting portions 91b to 91d.

  Next, the case where the antenna main body 21B is mounted on the wall surface of the veranda and the directivity direction is adjusted will be described.

  First, as shown in FIG. 13, a veranda metal fitting 15 is attached to a wall surface 14 of the veranda by screwing or the like. When the antenna main body 21B is used for horizontally polarized wave reception, the bracket mounting portion 91a provided at a position 90 ° from the side of the main body cover 90, that is, from the maximum directivity direction of the antenna main body 21B (front direction indicated by arrow a) 91b, a mast mounting bracket 93 is mounted. FIG. 13 shows a case where the mast mounting bracket 40 is mounted on the bracket mounting portion 91a provided on the left side of the main body cover 90.

  Then, the mounting members 93a and 93b of the mast mounting bracket 93 mounted on the antenna body 21B are mounted on the mast 17 of the veranda bracket 15, and the fixing bolt 96 is tightened and fixed. In this case, by loosening the fixing bolt 96, the antenna body 21B can be rotated in the horizontal direction together with the mast mounting bracket 93 around the mast 17, and the directivity maximum direction indicated by the arrow a can be adjusted.

  By mounting the mast mounting bracket 93 at a position 90 ° from the maximum directivity direction of the antenna main body 21B as described above, the antenna main body 21B is positioned parallel to the wall surface 14 of the veranda as in the first embodiment. And the directivity direction can be adjusted within a range of about 90 °. When adjusting the directivity in the direction opposite to the above case, the mast mounting bracket 93 is mounted on the bracket mounting portion 91b on the right side of the antenna body 21B. Also in this case, the directivity direction can be adjusted within a range of approximately 90 ° by adjusting the mounting position of the mast mounting bracket 93 with respect to the mast 17 as in the above case.

  As a result, the maximum directivity direction of the antenna main body 21B can be adjusted within a range of about 180 °, and the maximum directivity direction can be reliably matched to the arrival direction of radio waves. For this reason, the antenna gain can be received at the maximum, and the reception rate can be dramatically increased.

  In addition, even if only one of the metal fitting attachment portions 91a and 91b is used and the upper and lower sides are interchanged, it is possible to adjust the directivity direction in a range of approximately 180 °.

  When the antenna body 21B is used as a vertically polarized wave receiving antenna, the mast mounting bracket 93 is mounted on the bracket mounting portion 91c or the bracket mounting portion 91d provided adjacent to the bracket mounting portions 91a and 91b. And attached to the veranda fitting 15. That is, the antenna main body 21B is used as being rotated by 90 ° in the same plane from the state at the time of horizontal polarization reception. The adjustment range of the directivity direction in this case is approximately 180 ° as in the case of horizontal polarization reception, and the maximum directivity direction can be reliably matched to the arrival direction of the radio wave.

(Fourth embodiment)
Next, an antenna device according to a fourth embodiment of the present invention will be described.
In the fourth embodiment, as shown in FIG. 14, an indoor antenna 111 is configured by attaching an indoor stand 111 to the main body cover 90 of the antenna main body 21B shown in the third embodiment instead of the mast mounting bracket 93. It is.

  FIG. 14 is a perspective view of the case where the indoor stand 111 for horizontal polarization reception is configured by attaching the indoor stand 111 to the metal fitting attachment portion 91c or the metal fitting attachment portion 91d provided on the main body cover 90.

  Further, by attaching the indoor stand 111 to the metal fitting attachment portion 91a provided on the side surface adjacent to the metal fitting attachment portions 91c and 91d or the metal fitting attachment portion 91b, an indoor antenna for vertical polarization reception can be configured. it can.

  Also in the indoor antenna shown in the fourth embodiment, the same effect as that of the indoor antenna shown in the second embodiment can be obtained.

  Note that the present invention is not limited to the above-described embodiment as it is, and can be embodied by modifying constituent elements without departing from the scope of the invention in the implementation stage.

The structure of the antenna device which concerns on 1st Embodiment of this invention is shown, (a) is a front view, (b) is a left view, (c) is a right view, (d) is a lower side view. It is a perspective view for demonstrating attachment of the mast attachment metal fitting to the antenna main body in the embodiment. It is a disassembled perspective view of the principal part for demonstrating the attachment structure of the mast attachment metal fitting in the embodiment. It is a partial cross section figure which shows the internal structural example of the antenna apparatus which concerns on the same embodiment. FIG. 6 is a perspective view for explaining a directivity adjustment operation at the time of horizontal polarization reception in the antenna device according to the embodiment. FIG. 11 is a perspective view for explaining another example of adjusting the directivity when receiving horizontally polarized waves in the antenna device according to the embodiment. FIG. 6 is a perspective view for explaining a directivity adjustment operation at the time of vertical polarization reception in the antenna device according to the embodiment. FIG. 10 is a perspective view for explaining another example of adjustment operation of directivity at the time of vertical polarization reception in the antenna device according to the embodiment. It is a disassembled perspective view of the principal part which shows the detail of the stand attachment structure of the indoor antenna which concerns on 2nd Embodiment of this invention, and an indoor stand. It is a perspective view which shows the external appearance structure of the indoor antenna (at the time of horizontal polarization reception) in the embodiment. It is a perspective view which shows the external appearance structure of the indoor antenna (at the time of vertical polarization reception) in the embodiment. (A) is a figure which shows the indoor environment at the time of installing the indoor antenna in the embodiment indoors, (b) is a figure which shows the installation position and directivity relationship of an indoor antenna. It is a disassembled perspective view which shows the structure of the antenna device which concerns on 3rd Embodiment of this invention. It is a perspective view which shows the indoor antenna which concerns on 4th Embodiment of this invention. It is a back perspective view which shows the mounting state of the attachment metal fitting in the conventional antenna apparatus.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 14 ... Wall surface, 15 ... Veranda metal fitting, 17 ... Mast, 21A, 21B ... Antenna main body, 22 ... Radiation element part, 23 ... Reflecting plate part, 24 ... Coupling part, 25a, 25b ... Main body cover, 27a, 27b ... Bolt hole 28 ... Antenna output plug, 31 ... Bulkhead, 32a to 32d ... Screw fixing boss, 33a, 33b ... Bracket fixing bracket, 40 ... Mast mounting bracket, 41 ... Mast mounting bracket body, 42 ... Mast band, 43a , 43b ... bolt holding portion, 44a, 44b ... bracket fixing bolt, 45a, 45b ... holding plate, 46 ... U-shaped bolt, 47a, 47b ... bolt insertion hole, 48a, 48b ... wing nut, 49, 50 ... Recessed part 51 ... Radiating element 52a, 52b ... Loop element 53 ... Coupling line 54 ... Linear element 55 ... Side element 56 ... Groove 57a, 57b ... Feeding Projection, 58a, 58b ... feed point, 61 ... reflector, 62 ... feed cable, 63a, 63b ... holding member, 70 ... indoor stand, 71 ... stand base, 73a, 73b ... bolt insertion hole, 74a, 74b ... Stand fixing bolt, 80 ... Indoor, 81 ... Window, 82 ... TV receiver, 83 ... TV stand, 90 ... Body cover, 92 ... Bolt hole, 93 ... Metal, 93a, 93b ... Member, 94 ... Cover member, 95 ... Bolt insertion hole, 96 ... Fixing bolt, 97 ... Recess, 100 ... Bolt insertion hole, 111 ... Indoor stand

Claims (3)

  The antenna main body is formed in a planar shape and has a maximum directivity direction in a substantially front direction, and a mounting bracket provided on a side portion located in a direction of approximately 90 ° from the maximum directivity direction of the antenna main body. An antenna device.   An antenna body formed in a planar shape and having a directionality maximum direction in a substantially front direction; and a metal fitting mounting portion provided on at least two intersecting side portions located in a direction of about 90 ° from the directionality maximum direction of the antenna body; And an mast mounting bracket that is detachably provided on the bracket mounting portion. An antenna main body that is formed in a planar shape and has a maximum directivity direction in a substantially front direction, and a bracket mounting portion that is provided on each of at least two intersecting side portions located in a direction of approximately 90 ° from the maximum directivity direction of the antenna main body And
An antenna device for both an outdoor antenna and an indoor antenna, wherein the bracket mounting portion is configured such that a mast mounting bracket and an indoor stand are detachable.

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