JP2009246755A

JP2009246755A - Antenna

Info

Publication number: JP2009246755A
Application number: JP2008092000A
Authority: JP
Inventors: Toshiaki Inoko; 寿朗猪子; Masahiko Murase; 正彦村瀬
Original assignee: Maspro Denkoh Corp
Current assignee: Maspro Denkoh Corp
Priority date: 2008-03-31
Filing date: 2008-03-31
Publication date: 2009-10-22
Anticipated expiration: 2028-03-31
Also published as: JP5074266B2

Abstract

<P>PROBLEM TO BE SOLVED: To improve electric characteristics over a wide band, using a simple constitution. <P>SOLUTION: In an antenna, an antenna body having at least a radiator and a reflector is stored in a casing made of resin. The reflector is bent for formation so that it has a substantially V-shaped section, having an angular aperture slightly larger than a prescribed one. The casing made of resin is formed so that it has a substantially V-shaped section, having an angular aperture slightly smaller than the prescribed one so that the casing covers the antenna body from the rear side of the reflector, and has a casing body formed so that it has a locking means for locking the reflector on the inner surface of the storage space. By locking the reflector to the locking means when storing the reflector in the storage space of the casing body, the angular aperture of the reflector becomes a prescribed aperture, and the reflector is mounted to the storage space with a prescribed gap so that at least the outer surface of the reflector, excluding the tip section of the reflector, does not come into contact with the inner surface of the storage space. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

本発明は，主にテレビ受信に利用されるアンテナに関し，詳しくはＵＨＦ帯のテレビ電波を受信するＵＨＦアンテナに適したアンテナの構成に関する。
The present invention relates to an antenna mainly used for television reception, and more particularly to an antenna configuration suitable for a UHF antenna that receives television radio waves in the UHF band.

近年広がりつつある地上デジタル放送は，一定レベル以上の電波を受信できれば，デジタル放送の持つその優れた特性によって綺麗な画像を受信することが出来ることから，従来のアナログ放送受信用アンテナで一般的であった八木・宇多式アンテナばかりでなく，ベランダでも屋内であっても簡単に取付けができ，しかも邪魔にならないような小型で軽量，且つデザイン性にも優れたアンテナが求められるようになった。このようなアンテナの例として，たとえば，絶縁材と，この絶縁体に導電材によって薄膜状に形成された金属箔アンテナ素子を数枚貼着したアンテナが提案されている。
（例えば，特許文献１参照）
Digital terrestrial broadcasting, which has been spreading in recent years, is generally used with conventional analog broadcast receiving antennas because it can receive beautiful images due to its superior characteristics if it can receive radio waves above a certain level. In addition to the existing Yagi-Uta type antennas, there is a need for antennas that can be easily installed on the veranda or indoors, and that are small, lightweight, and have good design that does not get in the way. As an example of such an antenna, for example, an antenna is proposed in which an insulating material and several metal foil antenna elements formed in a thin film shape with a conductive material are attached to the insulator.
(For example, see Patent Document 1)

実開昭５７−１８５２０７号公報Japanese Utility Model Publication No. 57-185207

しかし，従来に示されるアンテナは，一般的な八木・宇田式アンテナのように，受信波長で決まる各素子の長さや形状等を金属箔アンテナ素子に置き換えたものであり，所望の特性を得るためには大きく変更することはできず，例えばアンテナを反射器と放射器だけで構成する事によって，アンテナを小型化すると共に，ベランダやアンテナ支柱への取付性がよいアンテナにしようとすると，その電気的特性は従来の細長い導体棒を使用したアンテナと同程度の電気的特性を得るためにはアンテナの外形も同程度の大きさに留まる。更に，絶縁材に形成された金属箔アンテナ素子からアンテナが構成されているので，アンテナが薄型にできるものの，八木・宇田式アンテナに良く見られるように，反射器を構成する金属波器アンテナ素子を多段にして更に特性の改善を図るためには，アンテナの構成が複雑になり延いてはコストが高くなるといった問題があった。
そこで，本発明においては，アンテナを小型化すると共に，なるべく薄型に構成することによって，ベランダやアンテナ支柱だけでなく室内設置にもその操作性がよく汎用性の高いアンテナを提案することになされるものであり，
その目的は，簡単な構成で電気的特性のよいアンテナを提案することを課題とする。
他の目的は，広帯域に亘って特性のよいアンテナを提案することを課題とする。
他の目的は，小型でも高性能なアンテナを提供することを課題とする。
他の目的は，設置工事に際して簡単且つ安全なアンテナを提供することを課題とする。
他の目的は，風などによって発生する振動に対して信頼性の高いアンテナを提供することを課題とする。
他の目的は，構造が簡単で組付けが容易なアンテナを提供することを課題とする。
However, the antenna shown in the past is the one in which the length and shape of each element determined by the reception wavelength is replaced with a metal foil antenna element, like a general Yagi-Uda type antenna, in order to obtain desired characteristics. For example, if the antenna is made up of only a reflector and a radiator, and the antenna is miniaturized, and the antenna is easy to attach to a veranda or antenna post, the electrical In order to obtain the same electrical characteristics as those of an antenna using a conventional elongated conductor rod, the outer shape of the antenna remains the same size. Furthermore, since the antenna is composed of a metal foil antenna element formed on an insulating material, the antenna can be made thin. However, as is often seen in Yagi-Uda type antennas, a metal wave antenna element that constitutes a reflector. In order to further improve the characteristics by increasing the number of stages, there is a problem that the configuration of the antenna becomes complicated and the cost increases.
Therefore, in the present invention, by reducing the size of the antenna and making it as thin as possible, it is possible to propose a highly versatile antenna that has good operability for indoor installation as well as a veranda and antenna support. Is,
The purpose is to propose an antenna with a simple structure and good electrical characteristics.
Another object is to propose an antenna having good characteristics over a wide band.
Another object is to provide a small but high-performance antenna.
Another object is to provide a simple and safe antenna for installation work.
Another object is to provide an antenna that is highly reliable against vibrations caused by wind and the like.
Another object is to provide an antenna that is simple in structure and easy to assemble.

上記課題を解決するために，請求項１の発明は，少なくとも，放射器と反射器とを備えるアンテナ本体を樹脂製筐体に収容してなるアンテナにおいて，
前記反射器は，受信する電波の偏波方向に対して平行する方向に長手方向を有した矩形の平板体を，該平板体の両短辺における略中心点を結ぶ中心部位を折曲部として，該折曲部の上側に位置する上部反射面と，該折曲部の下側に位置する下部反射面とが，所定の開口角より僅かに大きい開口角を有した断面略く字状となるように，該平板体の両長辺側をそれぞれ前記放射器方向に向かって折り曲げ形成されており，
前記樹脂製筐体は，前記反射器後方側から前記アンテナ本体に被せることができるように，前方側を開口し，内部に前記反射器を沿わせて収納できる収容空間を備える，前記所定の開口角より僅かに小さな開口角を有した断面略く字状に形成されると共に，前記収容空間の内面には，前記反射器を係止するための係止手段を備えるように形成された筐体本体を備えており，
前記反射器を前記筐体本体の収容空間に収納したときに，少なくとも，前記反射器の上部反射面及び下部反射面の先端部に備えられた係止部分が前記係止手段に係止することによって，前記反射器の開口角が前記所定の開口角となると共に，前記反射器の上部反射面及び下部反射面の先端部を除いて，少なくとも上部反射面及び下部反射面の外面が，前記収納空間の内面に対して当接しないよう，所定の間隙を有して前記収納空間に取付けられるように構成した。
In order to solve the above-mentioned problems, the invention of claim 1 is an antenna in which an antenna body including at least a radiator and a reflector is accommodated in a resin casing.
The reflector includes a rectangular flat plate having a longitudinal direction in a direction parallel to the polarization direction of a received radio wave, and a central portion connecting substantially central points on both short sides of the flat plate as a bent portion. The upper reflecting surface located above the bent portion and the lower reflecting surface located below the bent portion have a substantially rectangular cross section with an opening angle slightly larger than a predetermined opening angle; The two long sides of the flat plate are bent toward the radiator, respectively,
The resin casing includes a receiving space that is open on the front side so that the antenna body can be covered from the rear side of the reflector and that can accommodate the reflector along the inside. A casing that is formed in a substantially rectangular shape with an opening angle slightly smaller than the corner, and that is provided with locking means for locking the reflector on the inner surface of the housing space It has a body,
When the reflector is housed in the housing space of the housing body, at least locking portions provided at the tip portions of the upper reflecting surface and the lower reflecting surface of the reflector are locked to the locking means. The opening angle of the reflector becomes the predetermined opening angle, and at least the outer surfaces of the upper reflection surface and the lower reflection surface, except for the tips of the upper reflection surface and the lower reflection surface of the reflector, are stored in the housing. In order not to contact the inner surface of the space, it is configured to be attached to the storage space with a predetermined gap.

請求項２の発明は，請求項１に記載のアンテナにおいて，前記筐体本体の収容空間の内面に形成された前記係止手段は，前記収容空間内面に適宜の間隔をおいて複数箇所備えられるように形成されており，
前記筐体本体の収容空間に前記反射器を収納した時に，反射器の前記収納空間内面に備えられた前記係止手段に対向配置する係止部分を除いて，少なくとも上部反射面及び下部反射面の外面が，前記収納空間の内面に対して当接しないよう，所定の間隙を有して前記収納空間に取付けられるように構成した。
According to a second aspect of the present invention, in the antenna according to the first aspect, the locking means formed on the inner surface of the housing space of the housing body is provided at a plurality of positions with an appropriate interval on the inner surface of the housing space. Is formed as follows,
When the reflector is housed in the housing space of the housing body, at least an upper reflecting surface and a lower reflecting surface, except for a latching portion disposed opposite to the locking means provided on the inner surface of the housing space of the reflector. The outer surface is attached to the storage space with a predetermined gap so as not to contact the inner surface of the storage space.

請求項３の発明は，請求項１から請求項２のいずれか一項に記載のアンテナにおいて，前記アンテナはＵＨＦ帯の電波を受信するように構成した。
According to a third aspect of the present invention, in the antenna according to any one of the first to second aspects, the antenna is configured to receive a radio wave in the UHF band.

請求項１の発明によれば，少なくとも，放射器と反射器とを備えるアンテナ本体を樹脂製筐体に収容してなるアンテナにおいて，
前記反射器は，受信する電波の偏波方向に対して平行する方向に長手方向を有した矩形の平板体を，該平板体の両短辺における略中心点を結ぶ中心部位を折曲部として，該折曲部の上側に位置する上部反射面と，該折曲部の下側に位置する下部反射面とが，所定の開口角より僅かに大きい開口角を有した断面略く字状となるように，該平板体の両長辺側をそれぞれ前記放射器方向に向かって折り曲げ形成されており，
前記樹脂製筐体は，前記反射器後方側から前記アンテナ本体に被せることができるように，前方側を開口し，内部に前記反射器を沿わせて収納できる収容空間を備える，前記所定の開口角より僅かに小さな開口角を有した断面略く字状に形成されると共に，前記収容空間の内面には，前記反射器を係止するための係止手段を備えるように形成された筐体本体を備えており，
前記反射器を前記筐体本体の収容空間に収納したときに，少なくとも，前記反射器の上部反射面及び下部反射面の先端部に備えられた係止部分が前記係止手段に係止することによって，前記反射器の開口角が前記所定の開口角となると共に，前記反射器の上部反射面及び下部反射面の先端部を除いて，少なくとも上部反射面及び下部反射面の外面が，前記収納空間の内面に対して当接しないよう，所定の間隙を有して前記収納空間に取付けられるように構成したので，
薄板からなる反射器の開口角が，より剛性の強い筐体本体によって所定の角度となるように組付けることができ，製品ごとに電気的特性のバラツキの少ない製品が提供できる。更に加えて，反射器が，反射器自体がもつ付勢力によって，強固に筐体本体に組付けられると共に，例えアンテナが風などによって振動したとしても，アンテナ本体，特に反射器の上部反射面及び外部反射面が，筐体本体の内面壁とが接触しないので，アンテナから異常音が発生することがなくなるのである。
According to the invention of claim 1, in an antenna formed by housing an antenna body including at least a radiator and a reflector in a resin casing,
The reflector includes a rectangular flat plate having a longitudinal direction in a direction parallel to the polarization direction of a received radio wave, and a central portion connecting substantially central points on both short sides of the flat plate as a bent portion. The upper reflecting surface located above the bent portion and the lower reflecting surface located below the bent portion have a substantially rectangular cross section with an opening angle slightly larger than a predetermined opening angle; The two long sides of the flat plate are bent toward the radiator, respectively,
The resin casing includes a receiving space that is open on the front side so that the antenna body can be covered from the rear side of the reflector and that can accommodate the reflector along the inside. A casing that is formed in a substantially rectangular shape with an opening angle slightly smaller than the corner, and that is provided with locking means for locking the reflector on the inner surface of the housing space It has a body,
When the reflector is housed in the housing space of the housing body, at least locking portions provided at the tip portions of the upper reflecting surface and the lower reflecting surface of the reflector are locked to the locking means. The opening angle of the reflector becomes the predetermined opening angle, and at least the outer surfaces of the upper reflection surface and the lower reflection surface, except for the tips of the upper reflection surface and the lower reflection surface of the reflector, are stored in the housing. Since it is configured to be attached to the storage space with a predetermined gap so as not to contact the inner surface of the space,
The reflector made of a thin plate can be assembled so that the opening angle of the reflector becomes a predetermined angle by a more rigid housing body, and a product with little variation in electrical characteristics can be provided for each product. In addition, the reflector is firmly assembled to the housing body by the biasing force of the reflector itself, and even if the antenna vibrates due to wind or the like, the antenna body, particularly the upper reflecting surface of the reflector and Since the external reflection surface does not contact the inner wall of the housing body, no abnormal noise is generated from the antenna.

請求項２の発明によれば，請求項１に記載のアンテナにおいて，前記筐体本体の収容空間の内面に形成された前記係止手段は，前記収容空間内面に適宜の間隔をおいて複数箇所備えられるように形成されており，
前記筐体本体の収容空間に前記反射器を収納した時に，反射器の前記収納空間内面に備えられた前記係止手段に対向配置する係止部分を除いて，少なくとも上部反射面及び下部反射面の外面が，前記収納空間の内面に対して当接しないよう，所定の間隙を有して前記収納空間に取付けられるように構成したので，
反射器が，反射器自体がもつ付勢力によって，更に強固に筐体本体に組付けられると共に，例えアンテナが風などによって振動したとしても，アンテナ本体，特に反射器の上部反射面及び外部反射面と筐体本体の内面壁とは，前記係止部分を除いて接触しない，つまり筐体本体との接触部分が極めて少なくなるので，振動に対して異常音の発生の極めて少ないアンテナが提供できるのである。
According to a second aspect of the present invention, in the antenna according to the first aspect, the locking means formed on the inner surface of the housing space of the housing body is provided at a plurality of locations with appropriate intervals on the inner surface of the housing space. Is configured to be provided,
When the reflector is housed in the housing space of the housing body, at least an upper reflecting surface and a lower reflecting surface, except for a latching portion disposed opposite to the locking means provided on the inner surface of the housing space of the reflector. Since the outer surface of the housing is configured to be attached to the storage space with a predetermined gap so as not to contact the inner surface of the storage space,
The reflector is more firmly assembled to the housing body by the urging force of the reflector itself, and even if the antenna vibrates due to wind or the like, the antenna body, particularly the upper reflecting surface and the external reflecting surface of the reflector. And the inner wall of the housing body do not contact except for the locking portion, that is, the contact portion with the housing body is extremely small, so that it is possible to provide an antenna that generates very little abnormal noise against vibration. is there.

請求項３の発明によれば，請求項１から請求項２のいずれか一項に記載のアンテナにおいて，前記アンテナはＵＨＦ帯の電波を受信するように構成したので，
小型であっても全帯域にわたって安定した電気的特性を得られるので，地上デジタル放送の受信にすこぶる好適なアンテナを提供できるのである。また，ベランダ等に設置し手も，風などによってアンテナ本体が振動したとしても異常音の発生の少ない静かなアンテナを提供できる。
According to the invention of claim 3, in the antenna according to any one of claims 1 to 2, the antenna is configured to receive radio waves in the UHF band.
Even if it is small, stable electrical characteristics can be obtained over the entire band, so that it is possible to provide a suitable antenna that can be used for receiving terrestrial digital broadcasting. Moreover, even if the hand is installed on a veranda or the like and the antenna body vibrates due to wind or the like, it is possible to provide a quiet antenna with less abnormal noise.

以下に，本発明を具体化した実施形態の例を，図面を基に詳細に説明する。
図１は本発明に係るアンテナを説明するための分解斜視図である。図２は本発明に係るアンテナを構成するアンテナ本体を説明するための図であり，（ａ）は上面図，（ｂ）はＡ−Ａ線から見た側面図，（ｃ）は正面図である。図３は本発明に係るアンテナを構成する反射器を説明するための図であり，（ａ）は上面図，（ｂ）は正面図，（ｃ）は下面図，（ｄ）はＢ−Ｂ線からみた断面図である。図４は樹脂製筐体を構成する筐体本体に反射器を収納した状態を説明するための図面であり，（ａ）は正面図である。（ｂ）は筐体本体内に反射器と信号処理部を収納した場合の正面図であり，（ｃ）は（ｂ）におけるＣ−Ｃ線から見た断面図である。図５は本発明のアンテナを構成する反射器を樹脂製筐体に収納する実施例を説明するための図であり，（ａ）は図４（ｂ）におけるＤ−Ｄ線から見た，一部を破断した斜視図であり，（ｂ）は断面図である。図６は本発明のアンテナを構成する反射器を樹脂製筐体に収納するための異なる実施例の説明図であり，（ａ）は一部を破断した斜視図であり，（ｂ）は図における右側から見た断面図である。図７は図１におけるＥ−Ｅ線から見た断面図であり，（ａ）は反射器を樹脂製筐体に収納する前の図面であり，（ｂ）は樹脂製筐体を装着した後の断面図である。図８は本発明にかかるアンテナを構成するアンテナ本体の実施例を示す斜視図であり，（ａ）から（ｂ）にそれぞれ反射器が異なる実施例を示す。図９は反射器のスリットの有無による電気的特性の比較である。図１０は反射器の整合片の有無による電気的特性の比較である。図１１は本発明の異なる実施形態を示すアンテナの電気的特性を示す。
Hereinafter, an example of an embodiment embodying the present invention will be described in detail with reference to the drawings.
FIG. 1 is an exploded perspective view for explaining an antenna according to the present invention. 2A and 2B are diagrams for explaining an antenna body constituting an antenna according to the present invention, in which FIG. 2A is a top view, FIG. 2B is a side view seen from the line AA, and FIG. is there. 3A and 3B are diagrams for explaining a reflector constituting the antenna according to the present invention. FIG. 3A is a top view, FIG. 3B is a front view, FIG. 3C is a bottom view, and FIG. It is sectional drawing seen from the line. FIG. 4 is a drawing for explaining a state in which a reflector is housed in a casing body constituting a resin casing, and (a) is a front view. (B) is a front view at the time of accommodating a reflector and a signal processing part in a housing main body, (c) is sectional drawing seen from CC line in (b). FIG. 5 is a view for explaining an embodiment in which the reflector constituting the antenna of the present invention is housed in a resin casing. FIG. 5 (a) is a view taken along line DD in FIG. 4 (b). It is the perspective view which fractured | ruptured the part, (b) is sectional drawing. FIG. 6 is an explanatory view of a different embodiment for housing the reflector constituting the antenna of the present invention in a resin casing, (a) is a perspective view with a part broken away, and (b) is a diagram of FIG. It is sectional drawing seen from the right side. FIG. 7 is a cross-sectional view taken along line EE in FIG. 1, (a) is a drawing before the reflector is housed in the resin casing, and (b) is after the resin casing is mounted. FIG. FIG. 8 is a perspective view showing an embodiment of the antenna body constituting the antenna according to the present invention, and FIGS. FIG. 9 is a comparison of electrical characteristics with and without a slit in the reflector. FIG. 10 is a comparison of electrical characteristics with and without reflector matching pieces. FIG. 11 shows the electrical characteristics of the antenna showing different embodiments of the present invention.

本発明に係るアンテナの実施形態を図１及び図２を用いて説明する。図１は本発明に係るアンテナを説明するための分解斜視図である。図２は本発明に係るアンテナを構成するアンテナ本体を説明するための図であり，（ａ）は上面図，（ｂ）はＡ−Ａ線から見た側面図，（ｃ）は正面図である。図１において１は本発明に係るアンテナである。この実施例におけるアンテナ１は，少なくとも放射器１０と，放射器１０の後方に位置する反射器２０からなるアンテナ本体２と，アンテナ本体２を収納する樹脂製筐体であって，アンテナ本体２の後方側に位置するカバー５と，アンテナ本体２の前方側に位置するフロントカバー６とからなる。尚，前記カバー５が請求項に記載の筐体本体である。
An embodiment of an antenna according to the present invention will be described with reference to FIGS. FIG. 1 is an exploded perspective view for explaining an antenna according to the present invention. 2A and 2B are diagrams for explaining an antenna body constituting an antenna according to the present invention, in which FIG. 2A is a top view, FIG. 2B is a side view seen from the line AA, and FIG. is there. In FIG. 1, reference numeral 1 denotes an antenna according to the present invention. The antenna 1 in this embodiment is at least a radiator 10, an antenna body 2 composed of a reflector 20 located behind the radiator 10, and a resin casing for housing the antenna body 2. The cover 5 is located on the rear side, and the front cover 6 is located on the front side of the antenna body 2. The cover 5 is a housing body according to the claims.

本発明における放射器１０は，薄板状の導電材料を金型等によって打ち抜き成形した一対の給電素子１５，１５から構成されたダイポールアンテナである。この給電素子１５は，略長方形に形成されており，その基部１１側の略中間位置に給電点１１ａを備えている。また，該基部１１に相対向する辺の中間位置には，前記基部１１方向に向かって，辺を凹状に切り欠くことによって凹部１２を形成している。更に給電素子１５の周縁には，図に示されるように，複数の放射素子取付孔１７が形成されており，該放射素子取付孔１７に，後述するカバー５に形成された放射素子取付用ボス５７を挿入装着すれば，放射素子１５の前記基部１１側の辺同士が，所定の間隔を維持しながら並列配置してカバーに収納されることで放射器１０が構成される。
そして，図２によく示されているように，上記のように構成された放射器１０の給電点１１ａ，１１ａには，例えばフェライトコアにポリウレタン線を巻き回してなる平衡不平衡変換部１８を介して同軸ケーブル１９の一方端側が接続されており，更には，同軸ケーブル１９の他方の端部が，後述する前記カバー５に形成された出力端子５９の，カバー５内部に突出する内側端子部５９ａに接続されていることによって，前記放射器１０によって受信された信号は，前記出力端子５９からカバー５の外部に取出されるように構成されている。
The radiator 10 in the present invention is a dipole antenna composed of a pair of feed elements 15 and 15 formed by punching a thin plate-like conductive material with a mold or the like. The feeding element 15 is formed in a substantially rectangular shape, and includes a feeding point 11a at a substantially intermediate position on the base 11 side. Further, a concave portion 12 is formed at a middle position of the side opposite to the base portion 11 by cutting the side into a concave shape toward the base portion 11. Further, as shown in the figure, a plurality of radiating element mounting holes 17 are formed on the periphery of the power feeding element 15, and radiating element mounting bosses formed in the cover 5 to be described later are formed in the radiating element mounting holes 17. If 57 is inserted and mounted, the radiator 10 is configured by arranging the sides of the radiating element 15 on the base 11 side in parallel while maintaining a predetermined distance and storing them in the cover.
As shown well in FIG. 2, the feed point 11a, 11a of the radiator 10 configured as described above is provided with a balance-unbalance conversion unit 18 formed by, for example, winding a polyurethane wire around a ferrite core. The other end of the coaxial cable 19 is connected to an inner terminal portion of the output terminal 59 formed on the cover 5 (described later) that protrudes into the cover 5. By being connected to 59 a, the signal received by the radiator 10 is configured to be taken out from the output terminal 59 to the outside of the cover 5.

ここで，放射器１０の具体的な寸法について説明する。放射器の寸法は図２によく示されている。尚，以下に説明する本発明の実施形態に係るアンテナの具体的な寸法は，特にＵＨＦ帯を使って行われている地上デジタル放送に好適なアンテナの設計例を示したものである。
放射素子１５は導電性のある薄板材を，横幅（図２（ｃ）では縦方向の寸法）が１３６ｍｍ，縦幅（図２（ｃ）では横方向の寸法）が５４ｍｍの長方形状に打ち抜き形成したものであり，その基部１１側には給電点１１ａが形成されている。更に，基部１１と相対向する側の辺の中間位置には，横幅（図２（ｃ）では縦方向の寸法）が３７ｍｍ，縦幅（図２（ｃ）では横方向の寸法）が２０ｍｍの凹部１２を備えている。そして，このように形成された放射素子１５の基部１１側の辺を，相互に２ｍｍの間隔を隔てて対向配置することによって放射器１０が構成されている。
Here, specific dimensions of the radiator 10 will be described. The dimensions of the radiator are well shown in FIG. The specific dimensions of the antenna according to the embodiment of the present invention to be described below show an antenna design example particularly suitable for digital terrestrial broadcasting performed using the UHF band.
The radiating element 15 is formed by punching a conductive thin plate into a rectangular shape having a horizontal width (vertical dimension in FIG. 2C) of 136 mm and a vertical width (horizontal dimension in FIG. 2C) of 54 mm. A feeding point 11a is formed on the base 11 side. Further, at the intermediate position of the side opposite to the base 11, the horizontal width (vertical dimension in FIG. 2 (c)) is 37 mm, and the vertical width (horizontal dimension in FIG. 2 (c)) is 20 mm. A recess 12 is provided. And the radiator 10 is comprised by arrange | positioning the edge | side by the side of the base 11 of the radiation element 15 formed in this way at intervals of 2 mm mutually.

次に，反射器２０について図３を用いて説明する。図３は本発明に係るアンテナを構成する反射器を説明するための図であり，（ａ）は上面図，（ｂ）は正面図，（ｃ）は下面図，（ｄ）はＢ−Ｂ線からみた断面図である。本発明に係る反射器２０は，受信する電波の偏波方向に対して平行する方向に長手方向を有した導電材からなる矩形の平板体を，該平板体の両短辺における略中心点を結ぶ中心部位を折曲部２１として，所定の開口角θを有する断面略く字状となるように，該平板体の両長辺側をそれぞれ放射器１０方向に向かって折り曲げ形成すると共に，前記反射器２０の折曲部２１より上方に位置する上部反射面２２と，折曲部２１より下方に位置する下部反射面２３のそれぞれには，受信する電波の偏波の方向に直交する方向に長手方向を有する複数のスリット２５が形成されている。
Next, the reflector 20 will be described with reference to FIG. 3A and 3B are diagrams for explaining a reflector constituting the antenna according to the present invention. FIG. 3A is a top view, FIG. 3B is a front view, FIG. 3C is a bottom view, and FIG. It is sectional drawing seen from the line. The reflector 20 according to the present invention has a rectangular flat plate made of a conductive material having a longitudinal direction in a direction parallel to the polarization direction of a received radio wave, and has substantially center points on both short sides of the flat plate. The center portion to be joined is formed as a bent portion 21 so that both long side sides of the flat plate are bent toward the direction of the radiator 10 so that the cross section has a substantially square shape having a predetermined opening angle θ. Each of the upper reflecting surface 22 located above the bent portion 21 of the reflector 20 and the lower reflecting surface 23 located below the bent portion 21 has a direction orthogonal to the direction of polarization of the received radio wave. A plurality of slits 25 having a longitudinal direction are formed.

更に，本発明に係る実施形態の反射器２０には，少なくとも前記上部反射面２２若しくは下部反射面２３のいずれか一方の先端部（図３では上部反射面２２の先端部２２ａ）の所定の位置に，受信する電波の偏波に直交する方向に長手方向を有する細板状の整合片２８，２８を突出するように備えさせている。
Furthermore, in the reflector 20 according to the embodiment of the present invention, at least a predetermined position of the tip portion of either the upper reflecting surface 22 or the lower reflecting surface 23 (the tip portion 22a of the upper reflecting surface 22 in FIG. 3). Further, thin plate-shaped matching pieces 28 and 28 having a longitudinal direction in a direction orthogonal to the polarization of the received radio wave are provided so as to protrude.

反射器２０の折曲部２１の底部は平面２４を形成している。この平面２４には，適宜の間隔を置いて，反射器２０を後述するカバー５奥部に形成された反射器取付用ボス５１ａに取付けるための複数の取付孔２１ａ・・・，カバー５の奥部から前方に突出するように設けられているフロントパネル６取付用ボス５１ｂ，５１ｂを挿通するための貫通孔２１ｂ，２１ｂ，及び，後述する信号処理回路の取付用ボス５１ｃ，５１ｃを挿通するための貫通孔２１ｃ，２１ｃがそれぞれ形成されている。更に，下側反射面２３の図面左側には，前記内部端子部５９ａが突出するための孔２３ａ，及び，図には示されていない内部端子部５８ａが突出するための孔２３ｂが形成されている。このように形成された反射器２０は，樹脂製筐体を構成するカバー５に収納される。
以上本発明の実施形態に係るアンテナを構成する反射器２０によれば，平板体状の導電材の両長辺側をそれぞれ放射器１０方向に向かって所定の開口角θを有する断面略く字状となるように，折り曲げ形成したので，上下方向の寸法を小さくできる。
The bottom of the bent portion 21 of the reflector 20 forms a flat surface 24. A plurality of mounting holes 21 a for attaching the reflector 20 to reflector mounting bosses 51 a formed in the back part of the cover 5, which will be described later, are formed on the flat surface 24 at appropriate intervals. For inserting through holes 21b, 21b for inserting front panel 6 mounting bosses 51b, 51b provided so as to protrude forward from the parts, and mounting bosses 51c, 51c for signal processing circuits described later. Through-holes 21c and 21c are respectively formed. Further, on the left side of the lower reflecting surface 23 in the drawing, a hole 23a for projecting the internal terminal portion 59a and a hole 23b for projecting the internal terminal portion 58a (not shown) are formed. Yes. The reflector 20 formed in this way is accommodated in the cover 5 constituting the resin casing.
As described above, according to the reflector 20 that constitutes the antenna according to the embodiment of the present invention, the long side of the flat plate-like conductive material has a predetermined opening angle θ toward the direction of the radiator 10. Since it is bent so as to be shaped, the vertical dimension can be reduced.

ここで，反射器２０の具体的な寸法について説明する。各部の寸法は図３によく示されている。
横幅が２９０ｍｍの導電材からなる薄板を，図３（ｄ）に示されるように，折曲部２１を中心として上部反射面２２と下部反射面２３を，開口角θ＝４５°で前方側に折り返す。このとき上部反射面の縦幅が４５ｍｍ，折曲部２１における平面２４の縦幅が６ｍｍ，下部反射面の縦幅が４５ｍｍ，上部反射面２２と下部反射面２３の先端がなす開口寸法が４０．５ｍｍ，上部反射面２２の先端２２ａから突出するように備えられた整合片２８の長さが３０ｍｍとなるように薄板の縦寸法は決められている。
本発明に係る実施形態におけるスリット２５は，上部反射面２２と下部反射面２３のそれぞれに設けられており，前記反射面を縦幅３５ｍｍ，横幅が５ｍｍのおおきさで長方形状に貫通させたものであり，反射器２０の横方向の中心軸線上にスリット２５の中心を位置させ，スリット２５の中心線が相互に１０ｍｍの間隔を隔てて並列配置するように，複数のスリット２５が形成されている。
また，本発明に係る実施形態における整合片２８は，縦幅が３０ｍｍ，横幅が５ｍｍの大きさの短冊状に一体に形成されており，この実施形態においては，上部反射面２２の前端であって上部反射面２２の中心線ＣＬより左右に９５ｍｍ離れた位置に，整合片２８の中心線がくるように一体に備えられている。
Here, specific dimensions of the reflector 20 will be described. The dimensions of each part are well shown in FIG.
As shown in FIG. 3D, a thin plate made of a conductive material having a lateral width of 290 mm is placed on the front side with an opening angle θ = 45 °, with the upper reflecting surface 22 and the lower reflecting surface 23 centered on the bent portion 21. Wrap. At this time, the vertical width of the upper reflective surface is 45 mm, the vertical width of the flat surface 24 at the bent portion 21 is 6 mm, the vertical width of the lower reflective surface is 45 mm, and the opening dimension formed by the tips of the upper reflective surface 22 and the lower reflective surface 23 is 40 mm. The vertical dimension of the thin plate is determined so that the length of the alignment piece 28 provided to protrude from the tip 22a of the upper reflecting surface 22 is 30 mm.
The slit 25 in the embodiment according to the present invention is provided in each of the upper reflecting surface 22 and the lower reflecting surface 23, and the reflecting surface is penetrated in a rectangular shape with a large width of 35 mm and a width of 5 mm. A plurality of slits 25 are formed such that the center of the slit 25 is positioned on the central axis in the horizontal direction of the reflector 20 and the center lines of the slit 25 are arranged in parallel at an interval of 10 mm from each other. Yes.
Further, the alignment piece 28 in the embodiment according to the present invention is integrally formed in a strip shape having a vertical width of 30 mm and a horizontal width of 5 mm. In this embodiment, the alignment piece 28 is the front end of the upper reflecting surface 22. Thus, the alignment piece 28 is integrally provided so that the center line of the alignment piece 28 is located at a position 95 mm away from the center line CL of the upper reflecting surface 22 to the left and right.

次に，前出のカバー５について図１及び図４（ａ）を用いて詳しく説明する。図１はカバー５の斜視図であり，図４（ａ）はカバー５に反射器２０を収納した状態を示す正面図である。
このカバー５は樹脂製材料を金型等で成形したものであり，前記反射器２０の形状に合わせて，前方に開口部３０ａを備えた断面略く字状に形成されており，その内部には，少なくとも前記反射器２０を収納する空間３０が形成された箱体となるように構成されている。
カバー５の再奥部には，前記反射器２０の平面２４に対向するように，該平面２４を当て付けて，反射器２０を取付け及び位置決めをするための当付面３４が形成されている。この当付面３４には，反射器２０の平面２４に形成された前記取付孔２１ａに対向する位置に反射器取付用ボス５１ａが，反射器２０の平面２４に形成された前記貫通孔２１ｂ，２１ｂに対向する位置に，当付面３４から前方に突出するように設けられているフロントパネル６取付用ボス５１ｂ，５１ｂが，反射器２０の平面２４に形成された前記貫通孔２１ｃ，２１ｃに対向する位置に，後述する信号処理回路４０の取付用ボス５１ｃ，５１ｃがそれぞれ形成されている。
Next, the cover 5 described above will be described in detail with reference to FIGS. 1 and 4A. FIG. 1 is a perspective view of the cover 5, and FIG. 4A is a front view showing a state where the reflector 20 is housed in the cover 5.
The cover 5 is formed by molding a resin material with a mold or the like, and is formed in a substantially square shape with an opening 30a in front of the reflector 20 in the shape thereof. Is configured to be a box in which a space 30 for accommodating at least the reflector 20 is formed.
A contact surface 34 for attaching and positioning the reflector 20 is formed in the rear part of the cover 5 so as to face the plane 24 of the reflector 20. . The contact surface 34 has a reflector mounting boss 51 a at a position facing the mounting hole 21 a formed in the flat surface 24 of the reflector 20, and the through hole 21 b formed in the flat surface 24 of the reflector 20. Front panel 6 mounting bosses 51b, 51b provided so as to protrude forward from the abutting surface 34 at positions opposed to 21b are formed in the through holes 21c, 21c formed in the flat surface 24 of the reflector 20. At opposite positions, mounting bosses 51c and 51c of the signal processing circuit 40 described later are formed, respectively.

また，反射器２０の上部反射面２２と下部反射面２３に対向する，カバー５の内面壁には，前記反射器２０に形成されたスリット２５の前方内側端部に嵌合する複数の受止部３５と，前記反射器２０を構成する上部反射面２２と下部反射面２３のそれぞれの先端部と嵌合する複数の突片３６が形成されている。尚，本発明に係る実施形態においては，この突片３６が請求項に記載の係止手段である。また，この突片３６に嵌合する上部反射面２２と下部反射面２３の先端部が請求項に記載の係止部分である。
更に，カバー５の開口部３０ａにおける開口端の周縁内側には，該開口端に沿うように，放射器１０を構成する前記放射素子１５，１５を取付けるための手段であって，放射素子１５に形成された前記放射素子取付孔１７に対向する位置に，放射素子取付用ボス５７が形成されている。
加えて，カバー５の下面内側の中間部位には，前記同軸ケーブル１９を保持するための係止爪３３が形成されている。また，カバー５の下面外側の側方には，同軸ケーブル１９に伝送されてきた受信信号を出力するための出力端子５９が備えられている。この出力端子５９のカバー５の空間３０に現れる部分が前記内部端子部５９ａであり，前記同軸ケーブル１９の他方端の中心導体と外部導体がそれぞれ接続されている。
そして，このように構成されたカバー５には，反射器２０が収納されると共に，該反射器２０の収納が完了した後に，前記開口部３０ａを塞ぐように，前記放射素子１５，１５が組付けられる。これによって，一対の放射素子１５は，相互に所定の間隔をおいて配設されて放射器１０を形成すると共に，該放射器１０と前記反射器２０とが，前後に所定の間隔をおいて配設されることによって，アンテナ本体２が構成されるのである。
In addition, a plurality of receiving members fitted to the front inner end of the slit 25 formed in the reflector 20 are formed on the inner wall of the cover 5 facing the upper reflecting surface 22 and the lower reflecting surface 23 of the reflector 20. A plurality of projecting pieces 36 are formed to be fitted to the tip portions of the part 35 and the upper reflecting surface 22 and the lower reflecting surface 23 constituting the reflector 20. In the embodiment according to the present invention, the protruding piece 36 is the locking means described in the claims. Moreover, the front-end | tip part of the upper reflective surface 22 and the lower reflective surface 23 which fits into this protrusion 36 is a latching | locking part as described in a claim.
Further, on the inner periphery of the opening end of the opening 30 a of the cover 5, means for attaching the radiating elements 15, 15 constituting the radiator 10 along the opening end. A radiating element mounting boss 57 is formed at a position facing the formed radiating element mounting hole 17.
In addition, a locking claw 33 for holding the coaxial cable 19 is formed at an intermediate portion inside the lower surface of the cover 5. Further, an output terminal 59 for outputting a reception signal transmitted to the coaxial cable 19 is provided on the outer side of the lower surface of the cover 5. The portion of the output terminal 59 that appears in the space 30 of the cover 5 is the internal terminal portion 59a, to which the center conductor and the external conductor at the other end of the coaxial cable 19 are connected.
The cover 5 thus configured houses the reflector 20, and after the housing of the reflector 20 is completed, the radiating elements 15 and 15 are assembled so as to close the opening 30a. Attached. Thus, the pair of radiating elements 15 are arranged at a predetermined interval from each other to form the radiator 10, and the radiator 10 and the reflector 20 are spaced from each other at a predetermined interval. The antenna body 2 is configured by being arranged.

本発明に係る実施形態のアンテナ本体２においては，図２（ａ）に示されているように，放射器１０と反射器２０の間隔は，放射器１０と反射器２０の平面２４との間隔が１００ｍｍとなるように配設されており，この所定寸法によってアンテナ本体２が構成されている。このように構成されているアンテナ本体２がカバー５に収納されたなら，図１に示されるように，カバー５の前方側にフロントパネル６を装着して，カバー５の後方から，例えば，螺子９を使ってカバー５とフロントパネル６を固着することによってアンテナ１の組付けが完了する。
In the antenna body 2 according to the embodiment of the present invention, as shown in FIG. 2A, the distance between the radiator 10 and the reflector 20 is the distance between the radiator 10 and the plane 24 of the reflector 20. Is arranged to be 100 mm, and the antenna body 2 is constituted by this predetermined dimension. When the antenna body 2 configured in this way is housed in the cover 5, as shown in FIG. 1, a front panel 6 is attached to the front side of the cover 5, and, for example, a screw is inserted from the back of the cover 5. Assembling of the antenna 1 is completed by fixing the cover 5 and the front panel 6 using 9.

ここで，カバー５と反射器２０の係止方法について，図５から図７を用いて詳しく説明する。
先ず図５で示される実施例から説明する。図５は本発明のアンテナ１を構成する反射器２０をカバー５に収納する実施例を説明するための図であり，（ａ）は図４（ｂ）におけるＤ−Ｄ線から見た，一部を破断した斜視図，（ｂ）は断面図である。反射器２０は，反射器２０の折曲部２１に形成されている平面２４が，カバー５の空間３０の奥部に形成された当付面３４に当接するように装着される。そのとき上述したように，当付面３４から突設された反射器取付用ボス５１ａが，反射器２０の平面２４に形成された取付孔２１を挿通するよう，また，当付面３４から前方に突出するように設けられているフロントパネル６取付用ボス５１ｂ，５１ｂが，反射器２０の平面２４に形成された貫通孔２１ｂ，２１ｂを挿通するよう，信号処理回路の取付用ボス５１ｃ，５１ｃが，反射器２０の平面２４に形成された貫通孔２１ｃ，２１ｃを挿通するようにして取付ける。これによって反射器２０はカバー５内の所定位置に位置決めされて収納される。
尚，反射器２０の取付後は，反射器取付用ボス５１ａに対して，熱などを加えることによって変形させるように潰せば，反射器２０は確りとカバー５に固着することができる。
Here, a method of locking the cover 5 and the reflector 20 will be described in detail with reference to FIGS.
First, the embodiment shown in FIG. 5 will be described. FIG. 5 is a view for explaining an embodiment in which the reflector 20 constituting the antenna 1 of the present invention is housed in the cover 5, and (a) is a view taken along line DD in FIG. 4 (b). The perspective view which fractured | ruptured the part, (b) is sectional drawing. The reflector 20 is mounted such that the flat surface 24 formed in the bent portion 21 of the reflector 20 abuts against a contact surface 34 formed in the inner portion of the space 30 of the cover 5. At this time, as described above, the reflector mounting boss 51a protruding from the abutting surface 34 passes through the mounting hole 21 formed in the flat surface 24 of the reflector 20, and is further forward from the abutting surface 34. Mounting bosses 51c, 51c of the signal processing circuit so that the front panel 6 mounting bosses 51b, 51b provided so as to protrude through the through holes 21b, 21b formed in the flat surface 24 of the reflector 20 are inserted. However, it attaches so that it may penetrate the through-holes 21c and 21c formed in the plane 24 of the reflector 20. FIG. Thus, the reflector 20 is positioned and stored at a predetermined position in the cover 5.
After the reflector 20 is mounted, the reflector 20 can be firmly fixed to the cover 5 by crushing the reflector mounting boss 51a so as to be deformed by applying heat or the like.

この装着操作と同時に，図５に示されるように，カバー５の上下の内面壁に形成された前記受止部３５が，反射器２０に形成されたスリット２５の前方内側端部に嵌合すると共に，カバー５の上下の内面壁に形成された突片３６が，反射器２０を構成する上部反射面２２と下部反射面２３のそれぞれの先端部における係止部分と嵌合する。
更に詳しく説明する。図５（ｂ）に良く示されているように，前記受止部３５は，カバー５の内面壁と一体に空間３０に突設するように形成されており，スリット２５の前方内側端部と当接する受部３５ｂと，該受部３５ｂの上部若しくは下部にあって，前記スリット２５を挿通する突起３５ａとを備え，突起３５ａと受部３５ｂとカバー内面壁とで凹状の受止部３５が形成されており，この凹状部にスリット２５の前方内側端部が嵌合するのである。
また，前記突片３６は，カバー５の内面壁と一体に空間３０に僅かに突設するように形成されており，反射器２０の装着における最後の段階では，上部反射面２２と下部反射面２３は弾性を有していることから，その先端部が，それぞれ内側に押されながら前記突片３６を乗り越えるようにして装着が行なわれる。そして，装着が完了したなら，上部反射面２２と下部反射面２３の先端部は，その付勢力によって，カバー内面壁を押圧するように取付けられ，前記突片３６と該突片３６に対向する上下の反射面の先端部における係止部分とが嵌合して，反射器２０がカバー５内部に確りと取付けられるのである。
Simultaneously with this mounting operation, as shown in FIG. 5, the receiving portion 35 formed on the upper and lower inner walls of the cover 5 is fitted to the front inner end portion of the slit 25 formed in the reflector 20. At the same time, the projecting pieces 36 formed on the upper and lower inner walls of the cover 5 are engaged with the engaging portions at the respective leading ends of the upper reflecting surface 22 and the lower reflecting surface 23 constituting the reflector 20.
This will be described in more detail. As shown well in FIG. 5 (b), the receiving portion 35 is formed so as to protrude into the space 30 integrally with the inner wall of the cover 5, and the front inner end portion of the slit 25. A receiving portion 35b that abuts, and a projection 35a that is located above or below the receiving portion 35b and that passes through the slit 25. The front inner end portion of the slit 25 is fitted into this concave portion.
The projecting piece 36 is formed so as to project slightly in the space 30 integrally with the inner wall of the cover 5. In the final stage of mounting the reflector 20, the upper reflecting surface 22 and the lower reflecting surface are formed. Since 23 has elasticity, it is mounted so that its tip ends over the protruding piece 36 while being pushed inward. When the mounting is completed, the tip portions of the upper reflecting surface 22 and the lower reflecting surface 23 are attached so as to press the inner wall of the cover by the biasing force, and face the projecting piece 36 and the projecting piece 36. The engaging portions at the tip portions of the upper and lower reflecting surfaces are fitted, and the reflector 20 is securely attached to the inside of the cover 5.

上述したように本発明の実施形態における反射器２０は，アンテナとしての良好な特性を得るために，その開口角θは４５°であるようにするのが良い。ところが部品としての反射器２０を考えると，例えば，開口角を所定の角度θより僅かに大きくなるように形成しておいて，反射器２０をカバー５に収納して，前記突片３６に嵌合させた状態で，反射器２０の開口角θが４５°となるように構成すれば，反射器２０は，その付勢力によって更に強固にカバー５に組み付けられると共に，薄板からなる反射器２０の開口角θが，より剛性の強いカバー５によって，略一定のθで組付けられることになり，製品ごとに電気的特性のバラツキの少ない製品が提供できる。
このときの組付けの状態を図７に示している。図７は図１におけるＥ−Ｅ線から見た断面図であり，（ａ）は反射器をカバーに収納する前の図面，（ｂ）は装着した後の断面図である。この図において，カバー５に入れる前の反射器２０は，その開口角がθ１（θ１＞θ，θ＝４５°）で形成されており，その結果，反射器２０の開口端の寸法はＷ１＞４０．５ｍｍである。このように形成された部品としての反射器２０を，図５（ｂ）の如くカバー５に収納した状態で，その開口角がθ＝４５°となる。その結果，反射器２０の開口端の寸法はＷ＝４０．５ｍｍ，中心線ＣＬから整合片２８の先端までの寸法はＨである。
As described above, the reflector 20 in the embodiment of the present invention should have an opening angle θ of 45 ° in order to obtain good characteristics as an antenna. However, when considering the reflector 20 as a part, for example, the opening angle is formed to be slightly larger than a predetermined angle θ, the reflector 20 is accommodated in the cover 5, and is fitted into the protrusion 36. If the reflector 20 is configured such that the opening angle θ of the reflector 20 is 45 ° in the combined state, the reflector 20 is more firmly assembled to the cover 5 by the biasing force, and the reflector 20 made of a thin plate is used. The opening angle θ is assembled at a substantially constant θ by the more rigid cover 5, and a product with little variation in electrical characteristics can be provided for each product.
The assembled state at this time is shown in FIG. 7 is a cross-sectional view taken along line E-E in FIG. 1, (a) is a drawing before housing the reflector in the cover, and (b) is a cross-sectional view after mounting. In this figure, the reflector 20 before being put into the cover 5 has an opening angle of θ1 (θ1> θ, θ = 45 °). As a result, the size of the opening end of the reflector 20 is W1>. 40.5 mm. When the reflector 20 as a component formed in this way is housed in the cover 5 as shown in FIG. 5B, the opening angle is θ = 45 °. As a result, the dimension of the open end of the reflector 20 is W = 40.5 mm, and the dimension from the center line CL to the tip of the alignment piece 28 is H.

更に，この図７に示す実施例では，カバー５の突片３６は，反射器２０の開口端の寸法が，所定の寸法であるＷ＝４０．５ｍｍとなる位置，即ち，反射器２０をカバー５内の所定位置に収納することによって，反射器２０の形状が所定の形になるように形成されていると共に，カバー５自体の開口角が，反射器の所定の開口角θより僅かに小さく形成されていることによって，図５（ｂ）の如く，上部反射面２２及び外部反射面２３の先端部の外面を除いて，上部反射面２２及び外部反射面２３の外面とカバー５の内面壁との間が接触しないように，適度な間隔を有するように構成されている。このように構成されていることによって，アンテナ本体２，特に反射器２０が風などによって振動したとしても，上部反射面２２及び外部反射面２３とカバー５の内面壁とが接触しないので余分な異常音の発生がなくなるのである。
尚，上部反射面２２及び外部反射面２３の先端部と，カバー５の内面壁との間に緩衝材を介在させても良い。
Further, in the embodiment shown in FIG. 7, the protrusion 36 of the cover 5 covers the reflector 20 at a position where the dimension of the opening end of the reflector 20 is a predetermined dimension W = 40.5 mm. 5 is formed so that the shape of the reflector 20 is a predetermined shape, and the opening angle of the cover 5 itself is slightly smaller than the predetermined opening angle θ of the reflector. 5B, the outer surfaces of the upper reflecting surface 22 and the outer reflecting surface 23 and the inner wall of the cover 5 are removed except for the outer surfaces of the tip portions of the upper reflecting surface 22 and the outer reflecting surface 23. It is configured to have an appropriate interval so that there is no contact between the two. With this configuration, even if the antenna body 2, particularly the reflector 20 is vibrated by wind or the like, the upper reflective surface 22 and the external reflective surface 23 do not come into contact with the inner wall of the cover 5, so an extra abnormality There is no sound generation.
A cushioning material may be interposed between the tip portions of the upper reflection surface 22 and the external reflection surface 23 and the inner wall of the cover 5.

次に，反射器２０の取付構造の異なる実施例を，図６を用いて説明する。図６は本発明のアンテナ１を構成する反射器２０をカバー５に収納するための異なる実施例の説明図であり，（ａ）は一部を破断した斜視図，（ｂ）は図における右側から見た断面図である。
図６に示される実施例と，図５に示される実施例の異なる点は，前記カバー５に反射器２０を収納したときに，図５に示される前記実施例では，少なくとも前記反射器２０の上部反射面２２及び下部反射面２３の先端部外面全てがカバー５の内面壁に当接し，しかも，その先端部の係止部分が前記突片３６に嵌合する構成であったが，この図６の実施例では，前記空間３０内面に備えられた係止手段としての突片３６に対向配置する係止部分を除いて，少なくとも前記反射器２０の上部反射面２２及び下部反射面２２の外面とカバー５内面壁とが当接しないように，前記空間３０の内面に対して所定の間隙を有するように取付けられることを特徴とした例である。即ち，上部反射面２２及び下部反射面２３の先端部の，前記突片３６に対向する位置に，突片３６に向かって前記上部反射面２２及び下部反射面２３より外方向に突出するように形成した係止部分としての突出片２６を備えさせ，この突出片２６を前記突片３６に係止することによって，反射器２０は所定の形状でもって，カバー５に収納されるのである。このように構成されていることによって，アンテナ本体２，特に反射器２０が風などによって振動したとしても，上部反射面２２及び外部反射面２３とカバー５の内面壁とは，前記突出片２６の先方端部を除いて接触しないので，接触部分が極めて少なくなり，更に振動に対して異常音の発生の少ないアンテナが提供できるのである。
Next, different embodiments of the reflector 20 mounting structure will be described with reference to FIG. FIG. 6 is an explanatory view of a different embodiment for housing the reflector 20 constituting the antenna 1 of the present invention in the cover 5, (a) is a partially broken perspective view, and (b) is the right side in the figure. It is sectional drawing seen from.
The difference between the embodiment shown in FIG. 6 and the embodiment shown in FIG. 5 is that when the reflector 20 is housed in the cover 5, the embodiment shown in FIG. Although the outer surfaces of the tip portions of the upper reflecting surface 22 and the lower reflecting surface 23 are all in contact with the inner wall of the cover 5 and the engaging portions of the tip portions are fitted to the protruding pieces 36, In the sixth embodiment, at least outer surfaces of the upper reflecting surface 22 and the lower reflecting surface 22 of the reflector 20 except for a locking portion disposed opposite to the protruding piece 36 as locking means provided on the inner surface of the space 30. In this example, the cover 5 is attached to the inner surface of the space 30 so as to have a predetermined gap so that the inner wall of the cover 5 does not come into contact with the inner surface of the cover 5. That is, the tip portions of the upper reflecting surface 22 and the lower reflecting surface 23 are projected outward from the upper reflecting surface 22 and the lower reflecting surface 23 toward the projecting piece 36 at a position facing the projecting piece 36. By providing the formed projecting piece 26 as an engaging portion and engaging the projecting piece 26 with the projecting piece 36, the reflector 20 is housed in the cover 5 with a predetermined shape. With this configuration, even if the antenna body 2, particularly the reflector 20 is vibrated by wind or the like, the upper reflection surface 22, the external reflection surface 23, and the inner wall of the cover 5 are not covered by the protruding piece 26. Since there is no contact except for the front end, the contact portion is extremely small, and an antenna that generates less abnormal noise against vibration can be provided.

ここで以上のように構成された本発明に係るアンテナの電気的特性を示し，反射器２０に備えたスリット２５及び整合片２８の効果について以下に説明する。
先ず，スリット２５の効果について図９を用いて説明する。図９はスリット２５の有無による電気的特性の比較を示したものである。本発明の実施形態のアンテナによれば，スリット２５を設けた反射器２０を備えたアンテナは，スリットのない反射器を備えたアンテナに対して，低域側のＧＡＩＮ及びＶＳＷＲの改善がなされ，スリット２５の有効性が認められる。
尚，本発明の実施形態のスリット２５は，図３に良く示されるように，横幅２９０ｍｍ，縦幅４５ｍｍの大きさの上部反射面２２，下部反射面２３のそれぞれに，横幅５ｍｍ，縦幅３５ｍｍのスリットを，長手方向の中心軸の間隔が１０ｍｍとなるように並列配置するように構成されている。
Here, the electrical characteristics of the antenna according to the present invention configured as described above are shown, and the effect of the slit 25 and the matching piece 28 provided in the reflector 20 will be described below.
First, the effect of the slit 25 will be described with reference to FIG. FIG. 9 shows a comparison of electrical characteristics with and without the slit 25. According to the antenna of the embodiment of the present invention, the antenna including the reflector 20 provided with the slit 25 is improved in the GAIN and VSWR on the low frequency side as compared with the antenna including the reflector without the slit, The effectiveness of the slit 25 is recognized.
As shown in FIG. 3, the slit 25 according to the embodiment of the present invention has a horizontal width of 5 mm and a vertical width of 35 mm on each of the upper reflective surface 22 and the lower reflective surface 23 having a horizontal width of 290 mm and a vertical width of 45 mm. The slits are arranged in parallel so that the distance between the central axes in the longitudinal direction is 10 mm.

次に，整合片２８の効果について図１０を用いて説明する。図１０は整合片２８の有無による電気的特性の比較を示したものである。このデータは，整合片２８を上側反射面２２の所定位置に２つ設けた反射器と，上側反射面２２と下側反射面２３のそれぞれに２つ設けた反射器と，整合片のない反射器を備えたアンテナを比較したものである。ＶＳＷＲのデータからわかるように，整合片２８のない反射器を備えたものはＶＳＷＲの特性が一番悪く，上側に整合片が２個，上下それぞれに整合片が２個の順にＶＳＷＲが良くなる。ところが，ＧＡＩＮに注目すると，整合片２８がないもの，上側に整合片が２個のものは殆ど同じＧＡＩＮ特性を示すものの，上下それぞれに整合片が２個のものはＧＡＩＮの低下が見られる。本発明の実施形態のアンテナによれば，本発明の実施形態のように，整合片２８を少なくとも反射器２０を構成する上側反射面２２に２つ設けることによって，ＧＡＩＮの低下を招かずに，ＶＳＷＲの改善ができる事が分かり，整合片２８の有効性が認められる。
尚，本発明の実施形態の整合片２８は，図３に良く示されているように，縦幅が３０ｍｍ，横幅が５ｍｍの大きさに形成されており，この実施形態においては，横幅２９０ｍｍ，縦幅４５ｍｍの大きさの短冊状に形成された整合片２８が，上部反射面２２の先端であって，上部反射面２２の横幅の中心線より左右に９５ｍｍ離れた位置に，整合片２８の中心線がくるように一体に備えられている。
Next, the effect of the alignment piece 28 will be described with reference to FIG. FIG. 10 shows a comparison of electrical characteristics with and without the matching piece 28. This data includes a reflector in which two matching pieces 28 are provided at predetermined positions on the upper reflecting surface 22, a reflector in which two matching pieces 28 are provided on each of the upper reflecting surface 22 and the lower reflecting surface 23, and a reflection having no matching piece. This is a comparison of antennas equipped with instruments. As can be seen from the VSWR data, the one with the reflector without the matching piece 28 has the worst VSWR characteristic, and the VSWR improves in the order of two matching pieces on the upper side and two matching pieces on the upper and lower sides. . However, paying attention to the GAIN, the one without the matching piece 28 and the one with two matching pieces on the upper side show almost the same GAIN characteristics, but the one with two matching pieces above and below shows a decrease in GAIN. According to the antenna of the embodiment of the present invention, as in the embodiment of the present invention, by providing at least two matching pieces 28 on the upper reflection surface 22 constituting the reflector 20, the GAIN is not lowered. It can be seen that the VSWR can be improved, and the effectiveness of the matching piece 28 is recognized.
The alignment piece 28 according to the embodiment of the present invention is formed in a size having a vertical width of 30 mm and a horizontal width of 5 mm as well shown in FIG. 3. In this embodiment, the horizontal width is 290 mm, The alignment piece 28 formed in a strip shape having a vertical width of 45 mm is the tip of the upper reflection surface 22, and is located 95 mm away from the center line of the horizontal width of the upper reflection surface 22 to the left and right. It is provided integrally so that the center line comes.

次に，本発明に係るアンテナの異なる実施形態について図３（ｂ）及び（ｃ）を用いて説明する。この図３（ｂ）に示される実施形態と図３（ａ）に示される実施形態の違いは，アンテナに，図３（ｂ）における４０で示される信号処理部を備えたことである。この信号処理部４０は，例えば，放射器１０で受信した信号を，所定のレベルまで増幅するための増幅回路や，例えば衛星アンテナ等の外部アンテナからの信号を，このアンテナで受信した地上デジタル波の信号と混合するための混合回路等を備えた，図には示されていない信号処理回路を，例えば導電材用で形成されたシールドケース４４に収納したものである。本発明におけるシールドケース４４は，上下方向が薄手となるよう，上下面と四方を囲む側壁とからなるシールド性を備えた箱体であり，前記上部反射面２２及び下部反射面２３によって，前記反射器２０の前方側に形成される空間の中間部位に，少なくとも前記信号処理部４０の一つの側壁４５をアンテナの前方向に向けて，該信号処理部４０の一部若しくは全てを前記空間に重合するように配設されている。このシールドケース４４は，前記側壁４５と相対向する側壁に，該側壁より両側方に突設した，中央に貫通孔を備えた取付け脚が備えられており，この取付け脚を，前記取付用ボス５１，５１に対して当て付け，螺子４１，４１を前記貫通孔から取付用ボス５１Ｃ，５１ｃに対して羅着することでカバー５に対する取付けが行なわれる。尚，図３（ｂ）に示される１９は放射器１０で受信した信号を伝送する入力用の同軸ケーブルであり，４２は増幅や混合といった信号処理された信号を出力端子５９より出力するための同軸ケーブルである。また，４３は図には示されていない外部入力端子から入力される，衛星アンテナ等の外部アンテナからの信号を，信号処理回路に入力するための同軸ケーブルであり，一方は図の５８ａで示されている内部入力端に接続され，他方は信号処理回路に接続されている。
Next, different embodiments of the antenna according to the present invention will be described with reference to FIGS. The difference between the embodiment shown in FIG. 3B and the embodiment shown in FIG. 3A is that the antenna is provided with a signal processing unit indicated by 40 in FIG. 3B. The signal processing unit 40 is, for example, an amplifying circuit for amplifying a signal received by the radiator 10 to a predetermined level, or a signal from an external antenna such as a satellite antenna. A signal processing circuit (not shown in the figure) including a mixing circuit for mixing with the above signal is housed in a shield case 44 formed of, for example, a conductive material. The shield case 44 according to the present invention is a box having a shielding property composed of upper and lower surfaces and side walls surrounding the four sides so that the vertical direction is thin. The upper reflection surface 22 and the lower reflection surface 23 cause the reflection to occur. At least one side wall 45 of the signal processing unit 40 is directed to the front side of the antenna at an intermediate portion of the space formed on the front side of the device 20, and a part or all of the signal processing unit 40 is overlapped with the space. It is arranged to do. The shield case 44 is provided with a mounting leg having a through-hole at the center and projecting on both sides of the side wall 45 opposite to the side wall 45. The mounting leg is connected to the mounting boss. Attaching to the cover 5 is performed by applying the screws 41, 41 to the mounting bosses 51C, 51c from the through holes. 3B is an input coaxial cable for transmitting a signal received by the radiator 10, and 42 is a signal for outputting a signal processed signal such as amplification or mixing from an output terminal 59. It is a coaxial cable. Reference numeral 43 denotes a coaxial cable for inputting a signal from an external antenna such as a satellite antenna, which is input from an external input terminal not shown in the figure, to the signal processing circuit, and one of them is indicated by 58a in the figure. The other is connected to a signal processing circuit.

ここで，信号処理部４０を放射器１０と反射器２０の間に入れることの影響についての実験結果を，図１１を用いて説明する。図１１は信号処理部４０のない場合の電気的特性と，信号処理部４０の取付け方向の違いによる電気的特性の比較を行なったものである。
信号処理部４０の取付け方向は，図３（ｂ）に良く示されているように，前記信号処理部４０の側壁４５，つまり，薄手方向の面をアンテナの前方向に向けて取付けた場合と，信号処理部４０の上面若しくは下面，つまり，長手方向の面をアンテナの前方に向けて取付けた場合の２つである。このデータからわかるように，信号処理部４０が無い場合を基準とすると，薄手方向の面をアンテナの前方向に向けて取付けた場合は，信号処理部４０が反射器２０内に重合するように配設されていても，若干の劣化は見られるものの，ＧＡＩＮもＶＳＷＲも前後比も略同程度の特性が得られることがわかる。それに対して，信号処理部４０の上面若しくは下面をアンテナの前方に向けて取付けた場合は，帯域の低域側においてＶＳＷＲの改善が見られるものの，ＧＡＩＮの低下，前後比の劣化がみられる事が分かる。
つまり，本発明の実施形態によれば，信号処理部４０を，前記上部反射面２２及び下部反射面２３によって前記反射器２０の前方側に形成される空間の中間部位に，少なくとも前記信号処理部４０の薄手方向の一側壁４５をアンテナの前方向に向けて，該信号処理部４０の一部若しくは全てを前記空間に重合するように配設することによって，電気的特性の劣化のないアンテナを提供することができる。

尚，本発明は上記実施の形態に限定されるものではなく，以下に例示するように，本発明の趣旨を逸脱しない範囲で各部の構成を適宜に変更して実施することも可能である。
上述した実施形態は，反射器２０にスリット２５や整合片２８を用いて最適化した例を示したが，例えば，図８（ｂ），（ｃ）に示すようにスリット２５が有っても整合片２５がないもの（反射器６１），スリット２５も整合片２８もないもの（反射器６３）等，適宜に組み合わせて構成しても良いことは言うまでもない。
Here, the experimental result about the influence of putting the signal processing part 40 between the radiator 10 and the reflector 20 is demonstrated using FIG. FIG. 11 shows a comparison between the electrical characteristics in the absence of the signal processing unit 40 and the electrical characteristics due to the difference in the mounting direction of the signal processing unit 40.
As shown in FIG. 3 (b), the signal processing unit 40 is attached in the direction in which the side wall 45 of the signal processing unit 40, that is, the surface in the thin direction faces the front of the antenna. These are two cases where the upper or lower surface of the signal processing unit 40, that is, the longitudinal surface is attached to the front of the antenna. As can be seen from this data, when the signal processing unit 40 is not provided as a reference, the signal processing unit 40 is superimposed on the reflector 20 when the thin surface is attached to the front of the antenna. It can be seen that even though they are arranged, the GAIN, the VSWR, and the front-to-back ratio have substantially the same characteristics although slight deterioration is observed. On the other hand, when the upper or lower surface of the signal processing unit 40 is attached to the front of the antenna, the VSWR is improved on the low band side, but the GAIN is decreased and the front / rear ratio is deteriorated. I understand.
That is, according to the embodiment of the present invention, the signal processing unit 40 is disposed at least in the middle portion of the space formed on the front side of the reflector 20 by the upper reflecting surface 22 and the lower reflecting surface 23. An antenna with no deterioration in electrical characteristics can be obtained by arranging a part of or all of the signal processing unit 40 in the space with one side wall 45 in the thin direction 40 facing the front direction of the antenna. Can be provided.

The present invention is not limited to the above-described embodiment, and can be implemented by appropriately changing the configuration of each part without departing from the spirit of the present invention, as exemplified below.
In the above-described embodiment, an example in which the reflector 25 is optimized by using the slit 25 and the matching piece 28 is shown. However, for example, even if the slit 25 is present as shown in FIGS. Needless to say, a configuration in which the matching piece 25 is not provided (reflector 61), a configuration in which neither the slit 25 nor the matching piece 28 is provided (reflector 63), or the like may be appropriately combined.

本発明に係るアンテナを説明するための分解斜視図である。It is a disassembled perspective view for demonstrating the antenna which concerns on this invention. 本発明に係るアンテナ本体を説明するための図であり，（ａ）は上面図，（ｂ）はＡ−Ａ線から見た側面図，（ｃ）は正面図である。It is a figure for demonstrating the antenna main body which concerns on this invention, (a) is a top view, (b) is the side view seen from the AA line, (c) is a front view. 本発明に係るアンテナを構成する反射器を説明するための図であり，（ａ）は上面図，（ｂ）は正面図，（ｃ）は下面図，（ｄ）はＢ−Ｂ線からみた断面図である。It is a figure for demonstrating the reflector which comprises the antenna which concerns on this invention, (a) is a top view, (b) is a front view, (c) is a bottom view, (d) is seen from the BB line. It is sectional drawing. 樹脂製筐体に反射器を収納した状態を説明するための図面であり，（ａ）は正面図である。（ｂ）は樹脂製筐体内に反射器と信号処理部を収納した場合の正面図であり，（ｃ）は（ｂ）におけるＣ−Ｃ線から見た断面図である。It is drawing for demonstrating the state which accommodated the reflector in resin-made housing | casings, (a) is a front view. (B) is a front view at the time of accommodating a reflector and a signal processing part in a resin-made housing | casing, (c) is sectional drawing seen from CC line in (b). 本発明のアンテナを構成する反射器を樹脂製筐体に収納する実施例を説明するための図であり，（ａ）は図４（ｂ）におけるＤ−Ｄ線から見た，一部を破断した斜視図であり，（ｂ）は断面図である。It is a figure for demonstrating the Example which accommodates the reflector which comprises the antenna of this invention in a resin-made housing | casing, (a) is a part fracture | rupture seen from the DD line in FIG.4 (b). (B) is a sectional view. 本発明のアンテナを構成する反射器を樹脂製筐体に収納するための異なる実施例の説明図であり，（ａ）は一部を破断した斜視図であり，（ｂ）は図における右側から見た断面図である。It is explanatory drawing of the different Example for accommodating the reflector which comprises the antenna of this invention in resin-made housing | casings, (a) is the perspective view which fractured | ruptured one part, (b) is from the right side in a figure FIG. 図１におけるＥ−Ｅ線から見た断面図であり，（ａ）は反射器を筐体本体に収納する前の図面であり，（ｂ）は装着した後の断面図である。It is sectional drawing seen from the EE line | wire in FIG. 1, (a) is drawing before accommodating a reflector in a housing body, (b) is sectional drawing after mounting | wearing. 本発明にかかるアンテナを構成するアンテナ本体の実施例を示す斜視図であり，（ａ）から（ｂ）にそれぞれ反射器が異なる実施例を示す。It is a perspective view which shows the Example of the antenna main body which comprises the antenna concerning this invention, and shows the Example from which a reflector differs, respectively from (a) to (b). 反射器のスリットの有無による電気的特性の比較である。It is a comparison of the electrical characteristic by the presence or absence of the slit of a reflector. 反射器の整合片の有無による電気的特性の比較である。It is a comparison of the electrical characteristic by the presence or absence of the matching piece of a reflector. 本発明の異なる実施形態を示すアンテナの電気的特性を示す。Fig. 5 shows the electrical characteristics of an antenna showing different embodiments of the present invention.

Explanation of symbols

１…アンテナ，２…アンテナ本体，５…カバー，６…フロントパネル，９…螺子，１０…放射器，１１…基部，１１ａ…給電点，１２…凹部，１５…放射素子，１７…放射素子取付孔，１８…平衡不平衡変換部，１９…同軸ケーブル，２０…反射器，２１…折曲部，２１ａ…取付孔，２１ｂ・２１ｃ…貫通孔，２２…上部反射面，２２ａ…先端部，２３…下部反射面，２３ａ・２３ｂ…孔，２４…平面，２５…スリット，２６…突出片，２８…整合片，３０…空間，３０ａ…開口部，３３…係止爪，３４…当付面，３５…受止部，３５ａ…突起，３５ｂ…受部，３６…突片，４０…信号処理部，４１…螺子，４２…出力同軸ケーブル，４３…入力同軸ケーブル，４４…シールドケース，４５…側壁，５１ａ…反射器取付用ボス，５１ｂ…フロントパネル取付用ボス，５１ｃ…信号処理回路取付用ボス，５７…放射素子取付用ボス，５８ａ…内部端子部，５９…出力端子，５９ａ…内部端子部，６１・６２…反射器。 DESCRIPTION OF SYMBOLS 1 ... Antenna, 2 ... Antenna main body, 5 ... Cover, 6 ... Front panel, 9 ... Screw, 10 ... Radiator, 11 ... Base, 11a ... Feeding point, 12 ... Recessed part, 15 ... Radiation element, 17 ... Radiation element attachment Hole: 18 ... Balance / unbalance conversion part, 19 ... Coaxial cable, 20 ... Reflector, 21 ... Bending part, 21a ... Mounting hole, 21b / 21c ... Through hole, 22 ... Upper reflective surface, 22a ... Tip part, 23 ... lower reflective surface, 23a and 23b ... hole, 24 ... plane, 25 ... slit, 26 ... projecting piece, 28 ... alignment piece, 30 ... space, 30a ... opening, 33 ... locking claw, 34 ... contact surface, 35 ... receiving part, 35a ... projection, 35b ... receiving part, 36 ... projecting piece, 40 ... signal processing part, 41 ... screw, 42 ... output coaxial cable, 43 ... input coaxial cable, 44 ... shield case, 45 ... side wall , 51a ... Reflector mounting boss, 51b ... Flow Topaneru mounting boss, 51c ... signal processing circuit mounting boss, 57 ... radiator mounting boss, 58a ... internal terminal portion, 59 ... output terminal, 59a ... inner terminal portions, 61, 62 ... reflector.

Claims

In an antenna in which an antenna body including at least a radiator and a reflector is housed in a resin casing,
The reflector includes a rectangular flat plate having a longitudinal direction in a direction parallel to the polarization direction of a received radio wave, and a central portion connecting substantially central points on both short sides of the flat plate as a bent portion. The upper reflecting surface located above the bent portion and the lower reflecting surface located below the bent portion have a substantially rectangular cross section with an opening angle slightly larger than a predetermined opening angle; The two long sides of the flat plate are bent toward the radiator, respectively,
The resin casing includes a receiving space that is open on the front side so that the antenna body can be covered from the rear side of the reflector and that can accommodate the reflector along the inside. A casing that is formed in a substantially rectangular shape with an opening angle slightly smaller than the corner, and that is provided with locking means for locking the reflector on the inner surface of the housing space It has a body,
When the reflector is housed in the housing space of the housing body, at least locking portions provided at the tip portions of the upper reflecting surface and the lower reflecting surface of the reflector are locked to the locking means. The opening angle of the reflector becomes the predetermined opening angle, and at least the outer surfaces of the upper reflection surface and the lower reflection surface, except for the tips of the upper reflection surface and the lower reflection surface of the reflector, are stored in the housing. An antenna, wherein the antenna is attached to the storage space with a predetermined gap so as not to contact the inner surface of the space.

The locking means formed on the inner surface of the housing space of the housing body is formed to be provided at a plurality of locations at an appropriate interval on the inner surface of the housing space,
When the reflector is housed in the housing space of the housing body, at least an upper reflecting surface and a lower reflecting surface, except for a latching portion disposed opposite to the locking means provided on the inner surface of the housing space of the reflector. The antenna according to claim 1, wherein an outer surface of the antenna is attached to the storage space with a predetermined gap so that the outer surface does not contact the inner surface of the storage space.

The antenna according to any one of claims 1 to 2, wherein the antenna is configured to receive a radio wave in a UHF band.