200939558 九、發明說明： 【發明所屬之技術領域】 本發明係關於裝設於車輛以供良好地接收收音機廣播等 之車輛用接收設備。 【先前技術】 目前市售之幾乎大部分之汽車都裝備有接收收音機廣播 用之接收機、及連接於接收機以供接收收音機廣播波之天 線。裝設於汽車之接收設備（接收機及天線）最好滿足異於 落地型接收設備及攜帶用接收機之要件。要件之一係在裝 載有各種電氣機器，接收設備之設置處受到各種條件限制 之汽車中，難以收到電磁雜訊。另一要件係在即使汽車改 向（也就是說，汽車行進方向對電波來向發生變化），衰減 之影響也小。 以往，在適用於配置在車室内前方側之車輛寬度方向略 中央之收音機之「車輛用天線構造」中，已知有以連接電 纜將接收AM波及FM波等收音機用電波之單極天線連接至 收音機（接收機），而將中心群集機器、車體ECU及電動馬 達等之位於天線附近而有產生電氣雜訊之虞之機器，利用 金屬製之蓋加以覆蓋，經由接地線等導線將此等蓋接地 (earth)至車身體側之構造（例如參照專利文獻丨）。 [專利文獻1]曰本特開2002-36964號公報（段落[〇〇14]、 [〇〇18]、圖1) 【發明内容】 (發明所欲解決之問題） 134470.doc -6 - 200939558 但’在前述「車輛用天線構造」（專利文獻1所記載） 中’雖利用金屬製之蓋覆蓋有產生電氣雜訊之虞之機器， 但例如以近年來逐漸普及之混合動力車之動力設備為首， 有若干機器（尤其是電氣機器）難以充分施行電磁遮蔽。因 此’有電磁雜訊會由天線混入，導致收音機容易受其影響 之問題。再者，此「車輛用天線構造」由於配置於車室内 前方侧’故來自車身後方之接收波會特別大幅衰減，而有 天線之指向方向偏向前方之問題。 因此’本發明係以解決前述之問題，提供難以接收電磁 雜訊而具有良好之指.向性之車輛用接收設備為其課題。 (解決問題之技術手段） 為解決前述課題’本發明之車輛用接收設備之特徵在於 包含·天線元件，其係配置於車輛之金屬製車頂部之周緣 部；及徑向肋’其係一端被電性連接以與車頂部之前述天 線元件之配置處成等電位，且由該車頂部延設。 Φ 【實施方式】 (發明之效果） 依據本發明，可提供難以接收電磁雜訊而具有良好之指 向性之車輛用接收設備。 其次’參照付圖詳細地說明有關實施本發明之最佳型態 (以下稱為「實施型態」）。 圖1U)係表示設置本發明之車輛用接收設備1(參照圖4及 後述）之車輛20外觀之立體圖，圖1(b)係放大表示其要部之 模式的立體圖。參照圖丨時’天線元件丨丨及徑向肋12係車 134470.doc 200939558 輛用接收設備1之主要之構成要素。 在車輛20之車頂部21上之後端附近，即後玻璃30之附近 且在車輛20之行進方向之左右中央附近，配置有天線元件 11。又，不限於車頂部21之後端部，只要是車頂部之周緣 部，皆可配置天線元件11。天線元件11屬於接地型，被接 地於金屬製之車頂部21，其電氣的長度（電長度）以可對波 長λ之接收波發生良好共振之λ/4，或可獲得接近於水平方 向之揚升角之5λ/8為宜。天線元件11例如為使用作為車載 收音機天線之微型天線或單竿無指向天線。 由天線元件11之接地點附近，沿著後玻璃30向車輛20之 後方，配置有徑向肋12。徑向肋12係一種導體線或導體 膜，例如係由絕緣包覆銀線、銅線或鋁線所構成。從降低 高頻電流之有效電阻值之觀點言之，徑向肋丨2也可使用利 茲線（Litz wire)。徑向肋12之一端（接近於天線元件U之端） 被電性連接於天線元件11之接地點。此徑向肋12之一端與 天線元件11之接地點既可直接或利用連接線（未圖示）連 接，也可經由車輛2〇之金屬部分（車頂部21等）連接。在此 雖圖示有關使徑向肋12之他端（遠離天線元件^之端）接地 至車輛20之例，但此端部（遠端）也可不接地。 也就是說，徑向肋12之延設方向均係由接近於車頂部21 上之天線元件11之接地點，沿著窗玻璃之面而遠離車頂部 21之方向。即，將天線元件u配置於車頂部21之周緣部後 方之情形，徑向肋12係由車頂部21上接地點，沿著後玻璃 3〇之面而向車輛20(參照圖υ之概略後方延設。換言之，徑 134470.doc 200939558 向肋12之至少一部分係對左右分割車輛2〇之面平行地延 設。 以接收波之（在自由空間之）波長λ為基準，徑向助12之 電氣的長度（電長度）例如係設定為χ/4，以便可與此接收波 之基本波共振。此情形，徑向肋12之物理的長度（物理長 度）係呈現其電長度（也就是說，χ/4)乘以考慮後玻璃3〇之 介電常數等所決定之特定之波長縮短率後之值。又，徑向 肋12之電長度也可設定為从/8。此情形，例如，天線元件 11之電長度也只要設定為5 λ/8即可。另外，徑向肋12之電 長度设疋為λ/η(η為1以上20以下之整數）時，也可獲得良好 之接收性能。徑向肋12之長度設定為λ/η係由於可與接收 波之分譜波、基本波、高次譜波中之一方施行共振動作之 故’將η設定為20以下係由於徑向肋12具有此長度時，可 期待徑向肋12發揮特定效果，且相對於接收波之波長λ， 徑向肋12過短時，不能期待其效果之故。 又’徑向肋12之長度之基準也可設定為徑向肋丨2延設於 後玻璃30上之部分之長度。也就是說，後玻璃3〇上之徑向 肋12之電長度如前所述’也可設定為5λ/8、λ/4或九/11(11為i 以上20以下之整數）。此係由於徑向肋12係由配設於車頂 部21之後端部之天線元件11之附近被延設，故徑向肋12之 大部分被延設於後玻璃30上之故。再者，由於徑向肋12延 設於電介質構成之後玻璃30上之部分比延設於金屬構件之 車頂部21上之部分更能作為平台式偶極體執行特徵性的動 作之故。 134470.doc 200939558 在後玻璃30，配置有含複數熱線31之除霧線32，經由開 關2 6及溶絲（未圖不）等連接於電池2 7 圖2係表示設置本發明之車輛用接收設備1(參照圖4)之 車輛20、20b之外觀之側面圖，圖2(a)係表示4門車之情 形’圖2(b)係表示5門車之情形。 如圖2(a)所示，4門車之車輛2〇之情形，在其車頂部2丨之 後端附近配置天線元件丨丨，由天線元件丨丨之接地點或其附 近，沿著後玻璃30向車輛2〇之後方延設徑向肋12時，可構 ® 成天線10。 如圖2(b)所示，5門車之車輛2〇b之情形係與4門車之車 輛20之情形同樣地，在其車頂部21之後端附近配置天線元 件11，由天線元件11之接地點或其附近，沿著後玻璃3〇向 車輛20之後方延設徑向肋12時，可構成天線1〇。 如圖2(a)及圖2(b)所示，車輛2〇、2〇b係混合動力車輛或 電動汽車，在其車室内後部下方備置有車室内動力設備 ❹ 25。由於天線元件丨丨位於車室内後部上方之車頂部21，故 比較谷易受到來自車室内動力設備25等之配置於車室内後 部之機器類之電磁雜訊之影響，但可藉由本實施型態之構 成’有效地抑制該電磁雜訊之影響。 又，因車頂部21居於車輛2〇中地上高度最高之位置，故 配置於車頂部21之天線元件U之設置高度也會提高，尤其 在超短波以上之頻帶中，可提高接收信號之強度。 另外’由於在車頂部21之後端部配置天線元件丨丨，可使 車輛20、20b賦予流線型之印象，可提高其新式樣性。 134470.doc •10· 200939558 圖3係表示沿著徑向肋12切斷後玻璃3〇之面之縱剖面 圖。在圖3(a)至圖3(d)所示之各圖中，沿著其紙面，上方 為車室外側，沿著其紙面，下方為車室内側。 在圖3(a)至圖3(d)所示之後玻璃30之車室外側表面，均 配設有構成除霧線32(參照圖1)之熱線31 » 如圖3(a)所示，在配置徑向肋12之第1例中，沿著後玻璃 3〇之車室外側表面，延設徑向肋12。熱線31由於（1)藉由直 流電流之通電而發熱，不僅直流，對高頻電流，其阻抗也 較大；（2)徑向肋12被電介質之後玻璃30隔離；（3)徑向肋 12之延設方向（車輛2〇之前後方向）與熱線31之延設方向（車 輛20之左右方向）大致為直角，故熱線31對徑向肋丨]，不 太會造成作為導電體之影響。 如圖3(b)所示，在配置徑向肋12之第2例中，埋入後玻 璃30而形成徑向肋12。在此例中，也可獲得與第t例同樣 之效果，但為獲得依據理由（2)之效果，將徑向肋12埋入成 為使徑向肋12靠近後玻璃30之車室外側。 如圖3(c)所示，在配置徑向肋12之第3例中徑向肋丨之係 著後玻璃30之車室内側表面延設，為使徑向肋12與熱線 3 1絕緣’在此等之間介設有絕緣構件33。 如圖3(d)所示，在配置徑向肋18之第4例中使以絕緣 體構成之包覆層18b包覆高頻良導體構成之芯線旧而形成 向肋18延叹至後玻璃3〇之車内内側表面（即跨過轨線 31)。 … 圖4係表示本發明之車輛用接收設備1之模式的說明圖。 134470.doc 200939558 此車輛用接收設備1係包含備置有天線元件11及徑向肋 U之天線1〇、備置有内部導體（芯線）14及外部導體（網 線）13之同軸電纜15、及接收機16所構成。 天線元件11只要在其本體正下方備置有放大目的之頻率 之接收信號之小信號高頻放大器之前置放大器17即可。 來自前置放大器17之輸出信號被同軸電纜15引導至接收 機16❶同軸電纜15之外部導體13之一端（上端）係與天線元 件11之輸出端子之接地側同時被電性連接於車頂部21。徑 向肋12也被接地至此連接處或其附近，故天線元件u之接 地點、同軸電纜15之上端部及徑向肋12之天線元件u側在 接收時’係以大致同電位施行動作。因此，在天線元件1 1 之前方，徑向肋12執行作為平台式偶極體之動作，在天線 元件11之後方，徑向肋12執行作為平台式偶極體之動作。 如此，天線10實質上呈現水平面内無指向性，故可抑制車 輛20(參照圖1等）之改向所引起之衰減之影響。 在同軸電規15之他端（下端），内部導體14連接於接收機 16之内部電路，外部導體13連接於接收機16之框體。接收 機16之框體係金屬製，接地至車輛20(參照圖1等）之車室 内。如此，分別連接天線元件11之接地側、徑向肋12之天 線元件11侧、車頂部21之後端部、同轴電纜15之外部導體 13、及接收機16之框體，並接地至車頂部21及車輛20之車 室内，故可抑制來自車室内動力設備25(參照圖2)等之電磁 雜訊之混入’使來自天線元件11之接收信號可到達接收機 16 〇 134470.doc -12· 200939558 接收機16典型上’係用於接收超短波廣播（所謂FM收音 機廣播）’但也可具有中波廣播（所謂AM收音機廣播）、電 視廣播、文字多重廣播、聲音多重廣播、資料多重廣播等 接收功能。此等之情形’除了天線元件丨丨以外，尚備置有 適合於接收對象之廣播波之頻率之元件。 圖5(a)係表示由後部看備置有第1變形例之徑向肋12之5 門車輛2〇c之狀態之背面圖，圖5(b)係表示由後部看備置有 第2變形例之徑向肋丨2之5門車輛之叼之狀態之背面圖，圖 5(c)係表示由後部看備置有第3變形例之徑向肋丨2之$門車 輛20e之狀態之背面圖，圖5(d)係表示由後部看比較例之5 門車輛20f之狀態之背面圖。為便於說明，圖示開放後部 門之狀態。 如圖5(a)所示，第1變形例之徑向肋12係在車輛2〇e中， 由與車頂部21 (參照圖1等）之連接點〇向行進方向右側（紙 面右方）延伸’在車輛20c之右端附近撓曲而回到連接點g 之附近’大致撓曲成直角而沿著後玻璃30向車輛2〇c之後 方延伸。雖未圖示’但此徑向肋12也可在車輛2〇c中，由 與徑向肋12(參照圖1等）之連接點g向行進方向左側（紙面 左方）延伸，在車輛20c之左端附近撓曲而回到連接點g之 附近’大致撓曲成直角而沿著後玻璃3〇向車輛20c之後方 延伸。如此，徑向肋12不僅可延伸成直線狀，也可呈現撓 曲或彎曲之形狀。 如圖5(b)所示’第2變形例之徑向肋12係在車輛2〇d中， 一端連接於車輛20d之車身上部或車頂部21 (參照圖1等）後 134470.doc 13 200939558 緣之行進方向右端附近，向行進方向左側（紙面左方）延 伸’在左右方向中央附近大致撓曲成直角而沿著後玻璃30 向車輛20d之後方延伸。雖未圖示，但此徑向肋12也可在 車輛20d中，一端連接於車輛20d之車身上部或車頂部 21 (參照圖1等）後緣之行進方向左端附近，向行進方向右側 (紙面右方）延伸，在左右方向中央附近大致撓曲成直角而 沿著後玻璃30向車輛20d之後方延伸。 如圖5(c)所示，第3變形例之徑向肋12係在車輛20e中， 由以其行進方向右側（紙面右方）電性連接車頂部21 (參照圖 1等）與後部門之接合金屬線12a、與在閉鎖狀態之後部 門’其上端連接於後部門上部之左右方向中央附近，並向 車輛20之後方延伸之徑向肋12本體所構成。雖未圖示，但 接合金屬線12a也可以其行進方向左側（紙面左方）電性連接 車頂部21 (參照圖1等）與後部門。也就是說，接合金屬線 12a在電氣上，構成徑向肋12之一部分。 如圖5(a)〜圖5 (c)所示，在後部門或車頂部2丨（參照圖i等） 之周緣（也就是說，後部門或車頂部21、與後玻璃3〇之交 界處），且徑向肋12橫切之處，換言之，在後部門或車頂 部21與後玻璃30之交界處且接近於天線1〇之處劃出有關前 述周緣或交界處之切線（未圖示）。而，在徑向肋12中，某 一部分既可以對此切線平行之方式，延設至車輛2〇e〜2〇e 之車頂部21、後部門、後玻璃3〇等，也可在徑向肋12中， 另一部分既可以對此切線垂直之方式，延設至車輛 20c〜20e之車頂部21、後部門、後破璃3〇等。 134470.doc 200939558 如圖5(d)所示，比較例之車輛20f並未具有徑向肋12。 圖6(a)係以對頻率之雜訊位準表示圖5(a)所示之本實施 型態之車輛20c之接收特性之曲線圖，圓6(b)係以對頻率之 雜訊位準表示圖5(b)所示之比較例之車輛2〇d之接收特性之 曲線圖。 如圖6(a)所示’在本實施型態之車輛2〇(；中，在87 5 . MHz〜108.5 MHz之大部分之頻率範圍中，以雜訊底值（暗 雜）為基準之雜訊位準之大小收傲在5 [dB μν]以内，可知 車室内之雜訊源之影響非常小。 如圖6(b)所示’在比較例之車輛2〇d中，在87 5 MHz〜10 8.5 MHz之大部分之頻率範圍中，以雜訊底值（暗 雜訊）為基準之雜訊位準之大小收斂在5[ζ1Βμν]以上 10[<1Βμν]以下，可知已受到車室内之雜訊源之影響。 圖7係表不在本實施型態之車輛2〇之車室内動力設備25 (參照圖2)内設置雜訊源，依照徑向肋丨2之粗度模擬在天線 φ 兀件11之頂點位置之對接收頻率之空間電場強度之結果之 曲線圖。 如圖所示，無徑向肋之情形，雜訊之電場強度隨著頻 率之增高而微量地上升。 對此，有徑向肋12之情形，約在85 ΜΗζ以上之頻帶 中，雜訊之電場強度有效地低於無徑向肋12之情形。即， 可知藉由備置徑向肋12，故有減低雜訊之效果。 又，備置直線狀之0.5 mm徑之徑向肋12之情形，在89 MHz附近，雜訊之電場強度最低。又，備置直線狀之“ 134470.doc -15- 200939558 mm徑之徑向肋12之情形，在85 mHz以上之頻帶，雜訊之 電場強度平坦地變低《又，備置直線狀之2.〇 mm徑之徑向 肋12之情形’與備置直線狀之1.0 mm徑之徑向肋12之情形 同樣地’在85 MHz以上之頻帶，雜訊之電場強度平坦地變 低’但在79 MHz附近’雜訊之電場強度最低。 如此，可藉由改變徑向肋12之徑（粗度），選擇具有減低 • 雜訊之效果之頻帶。 【圖式簡單說明】 ❹ 圖1 (a)係表示設置本發明之車輛用接收設備之車輛外觀 之立體圖，（b)係放大表示其要部之模式的立體圖。 圖2係表示設置本發明之車輛用接收設備之車輛外觀之 側面圖，（a)係表示4門車之情形，（b)係表示5門車之情 形。 圖3(a)-(d)係表示沿著徑向肋切斷後玻璃之面之縱剖面 圖。 Φ 圖4係表示本發明之車輛用接收設備之模式的說明圖。 圖5(a)係表示由後部看備置有第丨變形例之徑向肋之$門 車輛之狀態之背面圖，（b)係表示由後部看備置有第2變形 例之徑向肋之5門車輛之狀態之背面圖，（c)係表示由後部 看備置有第3變形例之徑向肋之5門車輛之狀態之背面圖， (d)係表示由後部看比較例之5門車輛之狀態之背面圖。 U圓6(a)係以對頻率之雜訊位準表示圖5(a)所示之本實施 型態之車輛之接收特性之曲線圖，⑻係以對頻率之雜訊位 準表示圖5⑻所示之比較例之車輛之接收特性之曲線圖。 134470.doc -16- 200939558 圖7係表不在本實施型態之車輛之車室内動力設備内設 置雜訊源，依照徑向肋之粗度模擬在天線元件之頂點位置 之對接收頻率之空間電場強度之結果之曲線圖。 【主要元件符號說明】 1 車輛用接收設備 10 天線 11 天線元件 12 徑向肋 15 同轴電纜 16 接收機 17 前置放大器 20、20b、20c、20d 車輛 21 車頂部 25 車室内動力設備 30 後玻璃 31 熱線 32 除霧線 Φ[Technical Field] The present invention relates to a vehicle receiving device that is installed in a vehicle for receiving a radio broadcast or the like well. [Prior Art] Almost all of the cars currently on the market are equipped with a receiver for receiving radio broadcasts and an antenna connected to the receiver for receiving radio broadcast waves. The receiving device (receiver and antenna) installed in the car preferably satisfies the requirements of the floor-standing receiving device and the portable receiver. One of the requirements is that it is difficult to receive electromagnetic noise in a car in which various electrical machines are installed and the setting of the receiving device is limited by various conditions. Another requirement is that even if the car is redirected (that is, the direction of travel of the car changes in the direction of the electric wave), the effect of the attenuation is small. In the "vehicle antenna structure" for a radio that is disposed at a slightly center of the vehicle width direction on the front side of the vehicle interior, it is known to connect a monopole antenna that receives radio waves such as AM waves and FM waves to the connecting cable to the connecting cable. A radio (receiver) that covers the vicinity of the antenna, such as a central cluster machine, a vehicle body ECU, and an electric motor, and is covered with a metal cover, and is covered by a wire such as a ground wire. The structure in which the cover is grounded to the body side of the vehicle (for example, refer to the patent document 丨). [Patent Document 1] JP-A-2002-36964 (paragraph [〇〇14], [〇〇18], Fig. 1) [Summary of the Invention] (Problems to be Solved by the Invention) 134470.doc -6 - 200939558 However, in the above-mentioned "vehicle antenna structure" (described in Patent Document 1), although a metal cover is used to cover a device that generates electrical noise, for example, a power plant of a hybrid vehicle that has been gradually popularized in recent years. As a result, there are several machines (especially electrical machines) that are difficult to fully perform electromagnetic shielding. Therefore, there is a problem that the electromagnetic noise is mixed by the antenna, which causes the radio to be easily affected. Further, since the "vehicle antenna structure" is disposed on the front side of the vehicle interior, the reception wave from the rear of the vehicle body is particularly attenuated, and the direction in which the antenna is directed is biased toward the front. Therefore, the present invention has been made in order to solve the aforementioned problems and to provide a receiving device for a vehicle which is difficult to receive electromagnetic noise and has good directivity. (Means for Solving the Problems) In order to solve the above-mentioned problem, the vehicle receiving device of the present invention includes an antenna element which is disposed on a peripheral portion of a metal roof of a vehicle, and a radial rib which is one end of the vehicle The electrical connection is equipotential to the configuration of the aforementioned antenna element at the top of the vehicle and is extended by the roof of the vehicle. [Embodiment] (Effect of the Invention) According to the present invention, it is possible to provide a receiving device for a vehicle which is difficult to receive electromagnetic noise and has good directivity. Next, the best mode for carrying out the invention (hereinafter referred to as "implementation type") will be described in detail with reference to the drawings. Fig. 1U) is a perspective view showing the appearance of the vehicle 20 in which the vehicle receiving device 1 (see Fig. 4 and later described) of the present invention is installed, and Fig. 1(b) is an enlarged perspective view showing the mode of the main part. Referring to the figure ’, the antenna element 丨丨 and the radial rib 12 are 134470.doc 200939558 The main components of the receiving device 1 for the vehicle. The antenna element 11 is disposed in the vicinity of the rear end of the vehicle top portion 21 of the vehicle 20, that is, in the vicinity of the rear glass 30 and in the vicinity of the right and left centers in the traveling direction of the vehicle 20. Further, it is not limited to the rear end portion of the roof portion 21, and the antenna element 11 may be disposed as long as it is the peripheral portion of the roof portion of the vehicle. The antenna element 11 is of a grounding type and is grounded to the metal top 21, and its electrical length (electrical length) is λ/4 which can resonate well with the received wave of the wavelength λ, or can be raised close to the horizontal direction. 5λ/8 of the rising angle is suitable. The antenna element 11 is, for example, a micro antenna or a single-turn non-directional antenna that is used as an in-vehicle radio antenna. Radial ribs 12 are disposed in the vicinity of the grounding point of the antenna element 11 along the rear glass 30 toward the rear of the vehicle 20. The radial rib 12 is a conductor wire or a conductor film, for example, composed of an insulating coated silver wire, a copper wire or an aluminum wire. From the viewpoint of lowering the effective resistance value of the high-frequency current, the radial rib 2 can also use a Litz wire. One end of the radial rib 12 (close to the end of the antenna element U) is electrically connected to the ground point of the antenna element 11. One end of the radial rib 12 and the grounding point of the antenna element 11 may be connected either directly or by a connecting wire (not shown), or may be connected via a metal portion (the roof 21 or the like) of the vehicle 2 . Here, although the example in which the other end of the radial rib 12 (away from the end of the antenna element) is grounded to the vehicle 20 is illustrated, the end portion (distal end) may not be grounded. That is, the radial ribs 12 are oriented in a direction that is close to the ground point of the antenna element 11 on the roof 21 and away from the roof 21 along the face of the window glass. In other words, when the antenna element u is disposed behind the peripheral edge portion of the roof portion 21, the radial rib 12 is grounded on the roof 21 and faces the vehicle 20 along the surface of the rear glass 3 (refer to the schematic rear of the figure). In other words, the diameter 134470.doc 200939558 is extended to at least a portion of the rib 12 in parallel with the plane of the left and right divided vehicles. The receiving wave (in the free space) is based on the wavelength λ, and the radial assist 12 The length of the electrical (electrical length) is, for example, set to χ/4 so as to be able to resonate with the fundamental wave of the received wave. In this case, the physical length (physical length) of the radial rib 12 exhibits its electrical length (that is, , χ / 4) is multiplied by a value determined by considering a specific wavelength shortening ratio determined by the dielectric constant of the rear glass, etc. Further, the electrical length of the radial rib 12 may be set to be from /8. The electrical length of the antenna element 11 may be set to 5 λ/8. Further, when the electrical length of the radial rib 12 is λ/η (η is an integer of 1 or more and 20 or less), good results are also obtained. Receiving performance. The length of the radial rib 12 is set to λ/η due to the receivable wave When one of the spectral wave, the fundamental wave, and the high-order spectral wave is subjected to the resonance operation, η is set to 20 or less. Since the radial rib 12 has this length, the radial rib 12 can be expected to exert a specific effect and is relatively received. The wavelength λ of the wave, when the radial rib 12 is too short, the effect cannot be expected. Further, the reference of the length of the radial rib 12 can also be set to the length of the portion of the radial rib 2 extended on the rear glass 30. That is, the electrical length of the radial ribs 12 on the rear glass 3' can be set as 5λ/8, λ/4 or 9/11 (11 is an integer of 20 or more and 20 or less). Since the radial ribs 12 are extended from the vicinity of the antenna element 11 disposed at the rear end portion of the roof portion 21, most of the radial ribs 12 are extended on the rear glass 30. The portion of the radial rib 12 extending over the glass 30 after the dielectric is formed is more capable of performing a characteristic action as a platform dipole than the portion extending over the top 21 of the metal member. 134470.doc 200939558 30, configured with a defogging line 32 containing a plurality of hot lines 31, via a switch 26 and a dissolved wire (not shown) Fig. 2 is a side view showing the appearance of the vehicles 20, 20b in which the vehicle receiving device 1 (see Fig. 4) of the present invention is installed, and Fig. 2(a) shows the situation of the four-door car. (b) shows the situation of a 5-door car. As shown in Fig. 2(a), in the case of a 2-car vehicle, the antenna element 配置 is placed near the rear end of the car's top 2, and the antenna element 丨丨At or near the grounding point, when the radial rib 12 is extended along the rear glass 30 toward the rear of the vehicle 2, the antenna 10 can be constructed. As shown in Fig. 2(b), the vehicle of the 5-door vehicle is 2〇b. Similarly to the case of the vehicle 20 of the four-door vehicle, the antenna element 11 is disposed near the rear end of the vehicle top portion 21, and the radial direction of the rear side of the vehicle 20 is extended by the rear glass 3 from the ground point of the antenna element 11 or its vicinity. In the case of the rib 12, the antenna 1〇 can be constructed. As shown in Fig. 2(a) and Fig. 2(b), the vehicle 2〇, 2〇b is a hybrid vehicle or an electric vehicle, and an in-vehicle power unit ❹ 25 is provided below the rear portion of the vehicle interior. Since the antenna element 丨丨 is located at the top 21 of the vehicle above the rear of the vehicle compartment, the comparison valley is susceptible to electromagnetic noise from a machine-like power equipment 25 or the like arranged in the rear of the vehicle interior, but this embodiment can be adopted. The composition 'effectively suppresses the influence of the electromagnetic noise. Further, since the top portion 21 of the vehicle is located at the highest position in the vehicle 2, the height of the antenna element U disposed on the roof portion 21 is also increased, and in particular, in the frequency band of the ultrashort wave or higher, the strength of the received signal can be improved. Further, since the antenna element 配置 is disposed at the rear end of the vehicle top portion 21, the vehicles 20 and 20b can be given a streamlined impression, and the new style can be improved. 134470.doc •10· 200939558 Fig. 3 is a longitudinal sectional view showing the surface of the glass 3〇 cut along the radial rib 12. In each of the drawings shown in Fig. 3 (a) to Fig. 3 (d), along the paper surface, the upper side is the outside of the vehicle, the paper surface, and the lower side is the interior side of the vehicle. 3(a) to 3(d), the outdoor side surface of the glass 30 is provided with a heat line 31 constituting the demisting line 32 (refer to FIG. 1). As shown in FIG. 3(a), In the first example in which the radial ribs 12 are disposed, the radial ribs 12 are extended along the outdoor side surface of the rear glass 3〇. The hot wire 31 generates heat due to (1) energization by a direct current, not only direct current but also a high frequency current; (2) the radial rib 12 is isolated by the glass 30 after the dielectric; (3) the radial rib 12 The extending direction (the front and rear directions of the vehicle 2) and the extending direction of the hot wire 31 (the left and right direction of the vehicle 20) are substantially at right angles, so that the hot wire 31 does not affect the radial ribs]. As shown in Fig. 3(b), in the second example in which the radial ribs 12 are disposed, the rear glass 30 is buried to form the radial ribs 12. Also in this example, the same effect as in the t-th example can be obtained, but in order to obtain the effect (3), the radial rib 12 is buried so that the radial rib 12 is close to the outside of the rear glass 30. As shown in Fig. 3(c), in the third example in which the radial ribs 12 are disposed, the radial ribs are extended to the interior side surface of the rear glass 30 to insulate the radial ribs 12 from the hot wire 31. An insulating member 33 is interposed between these. As shown in Fig. 3(d), in the fourth example in which the radial ribs 18 are disposed, the cladding layer 18b made of an insulator is coated with a core wire composed of a high-frequency good conductor, and the rib 18 is extended to the rear glass. The inside inner surface of the car (ie, across the trajectory 31). Fig. 4 is an explanatory view showing a mode of the vehicle receiving device 1 of the present invention. 134470.doc 200939558 The vehicle receiving device 1 includes an antenna 1 including an antenna element 11 and a radial rib U, a coaxial cable 15 provided with an inner conductor (core wire) 14 and an outer conductor (network cable) 13, and receiving The machine 16 is constructed. The antenna element 11 may be provided with a small-signal high-frequency amplifier preamplifier 17 that amplifies a reception signal of a frequency of interest at a right side of the main body. The output signal from the preamplifier 17 is guided by the coaxial cable 15 to the receiver 16, and one end (upper end) of the outer conductor 13 of the coaxial cable 15 is electrically connected to the vehicle top 21 at the same time as the ground side of the output terminal of the antenna element 11. The radial rib 12 is also grounded to or near the junction, so that the contact point of the antenna element u, the upper end portion of the coaxial cable 15, and the antenna element u side of the radial rib 12 are operated at substantially the same potential. Therefore, before the antenna element 1 1 , the radial rib 12 performs an action as a plate type dipole, and after the antenna element 11 , the radial rib 12 performs an action as a plate type dipole. Thus, the antenna 10 substantially exhibits no directivity in the horizontal plane, so that the influence of the attenuation caused by the redirection of the vehicle 20 (see Fig. 1 and the like) can be suppressed. At the other end (lower end) of the coaxial electric gauge 15, the inner conductor 14 is connected to the internal circuit of the receiver 16, and the outer conductor 13 is connected to the casing of the receiver 16. The frame system of the receiver 16 is made of metal and grounded to the vehicle compartment of the vehicle 20 (see Fig. 1, etc.). Thus, the ground side of the antenna element 11, the antenna element 11 side of the radial rib 12, the rear end of the roof 21, the outer conductor 13 of the coaxial cable 15, and the frame of the receiver 16 are respectively connected and grounded to the top of the vehicle. 21 and the interior of the vehicle 20, it is possible to suppress the incorporation of electromagnetic noise from the in-vehicle power unit 25 (see Fig. 2) and the like, so that the received signal from the antenna element 11 can reach the receiver 16 〇 134470.doc -12· 200939558 Receiver 16 is typically used to receive ultrashort wave broadcasts (so-called FM radio broadcasts) but can also receive medium wave broadcasts (so-called AM radio broadcasts), television broadcasts, teletext, multi-broadcasts, multiple broadcasts, etc. Features. In such a case, in addition to the antenna element ,, an element suitable for receiving the frequency of the broadcast wave of the object is provided. Fig. 5 (a) is a rear view showing a state in which the five-door vehicle 2 〇 c of the radial rib 12 of the first modification is placed in the rear view, and Fig. 5 (b) shows a second modification in the rear view. The rear view of the state of the five-door vehicle of the radial rib 2, and FIG. 5(c) is a rear view showing the state of the door vehicle 20e in which the radial rib 2 of the third modification is placed in the rear view. Fig. 5 (d) is a rear view showing the state of the five-door vehicle 20f of the comparative example as seen from the rear. For ease of explanation, the illustration shows the state of the rear door. As shown in Fig. 5(a), the radial rib 12 of the first modification is attached to the vehicle 2〇e, and is connected to the right side of the traveling direction (the right side of the paper) by the connection point with the roof 21 (see Fig. 1 and the like). The extension 'flexes near the right end of the vehicle 20c and returns to the vicinity of the connection point g' is substantially flexed at a right angle and extends along the rear glass 30 toward the rear of the vehicle 2〇c. Although not shown in the figure, the radial rib 12 may be extended to the left side (the left side of the paper surface) in the traveling direction by the connection point g with the radial rib 12 (see FIG. 1 and the like) in the vehicle 2〇c, in the vehicle 20c. The vicinity of the left end is deflected and returns to the vicinity of the connection point g to 'substantially flex at a right angle and extends along the rear glass 3 to the rear of the vehicle 20c. Thus, the radial ribs 12 can extend not only in a straight line but also in a curved or curved shape. As shown in Fig. 5(b), the radial rib 12 of the second modification is attached to the vehicle 2〇d, and one end is connected to the upper portion of the vehicle body of the vehicle 20d or the roof 21 (see Fig. 1, etc.) 134470.doc 13 200939558 In the vicinity of the right end of the direction of travel of the edge, the left side in the traveling direction (the left side of the paper sheet) is bent substantially at right angles in the vicinity of the center in the left-right direction and extends rearward of the vehicle 20d along the rear glass 30. Although not shown, the radial rib 12 may be connected to the left side of the traveling direction of the rear edge of the vehicle body upper portion or the vehicle top portion 21 (see FIG. 1 and the like) in the vehicle 20d, and the right side is in the traveling direction right side ( The right side of the paper sheet extends and is bent substantially at right angles in the vicinity of the center in the left-right direction and extends rearward of the vehicle 20d along the rear glass 30. As shown in Fig. 5(c), the radial rib 12 of the third modification is attached to the vehicle 20e, and the vehicle top portion 21 (see Fig. 1, etc.) and the rear portion are electrically connected by the right side (the right side of the paper surface) in the traveling direction. The joining wire 12a is formed by the body of the radial rib 12 which is connected to the center of the left and right direction of the upper portion of the rear door after the door is closed, and extends to the rear of the vehicle 20. Although not shown, the bonding wire 12a may be electrically connected to the vehicle top portion 21 (see Fig. 1 and the like) and the rear portion in the traveling direction left side (left side of the paper surface). That is, the bonding wire 12a electrically forms part of the radial rib 12. As shown in Fig. 5(a) to Fig. 5(c), at the boundary of the rear door or the top of the car 2 (refer to the figure i, etc.) (that is, the boundary between the rear door or the roof 21 and the rear glass 3) Wherever, and the radial ribs 12 are transversely cut, in other words, at the junction of the rear door or the roof 21 and the rear glass 30 and close to the antenna 1 划, a tangent to the aforementioned circumference or junction is drawn (not shown) Show). However, in the radial rib 12, a certain portion may be extended to the vehicle top 21, the rear door, the rear glass 3, etc. of the vehicle 2〇e~2〇e in a manner parallel to the tangent, or may be in the radial direction. In the rib 12, another portion may be extended to the top 21 of the vehicle 20c to 20e, the rear door, the rear glass, and the like in a manner perpendicular to the tangential line. 134470.doc 200939558 As shown in FIG. 5(d), the vehicle 20f of the comparative example does not have the radial ribs 12. Fig. 6(a) is a graph showing the reception characteristics of the vehicle 20c of the present embodiment shown in Fig. 5(a) with the noise level of the frequency, and the circle 6(b) is the noise level for the frequency. A graph showing the reception characteristics of the vehicle 2〇d of the comparative example shown in Fig. 5(b). As shown in Fig. 6(a), in the frequency range of the majority of the range of 87 5 . MHz to 108.5 MHz, the frequency of the noise (dark) is used as the reference. The size of the noise level is within 5 [dB μν], and the influence of the noise source in the car interior is very small. As shown in Fig. 6(b), in the vehicle 2〇d of the comparative example, at 87 5 In the frequency range of most of MHz~10 8.5 MHz, the size of the noise level based on the noise bottom value (dark noise) converges below 5 [ζ1Βμν] 10 [<1Βμν], which is known to have been received. The influence of the noise source in the vehicle interior. Fig. 7 shows that the noise source is not provided in the indoor power equipment 25 (refer to Fig. 2) of the vehicle 2 of the present embodiment, and the thickness is simulated according to the thickness of the radial rib 2 The graph of the result of the spatial electric field strength of the apex position of the antenna φ element 11 versus the receiving frequency. As shown in the figure, in the case of no radial rib, the electric field strength of the noise increases slightly with the increase of the frequency. Therefore, in the case of the radial rib 12, the electric field strength of the noise is effectively lower than that of the non-radial rib 12 in the frequency band of about 85 ΜΗζ or more. That is, it can be seen that the radial rib 12 is provided, so that the effect of noise is reduced. Further, in the case of the linear rib 12 having a diameter of 0.5 mm, the electric field strength of the noise is the lowest at around 89 MHz. In addition, in the case of the linear ribs 12 of the 134470.doc -15-200939558 mm diameter, the electric field strength of the noise is flattened flat in the frequency band of 85 mHz or more. The case of the radial rib 12 of the mm diameter is the same as the case of the radial rib 12 having a linear diameter of 1.0 mm. In the frequency band of 85 MHz or more, the electric field strength of the noise is flattened flatly but near 79 MHz. 'The electric field strength of the noise is the lowest. Thus, by changing the diameter (thickness) of the radial rib 12, the frequency band with the effect of reducing the noise can be selected. [Simplified illustration] ❹ Figure 1 (a) shows Fig. 2 is a perspective view showing a vehicle appearance of a vehicle receiving apparatus according to the present invention, and Fig. 2 is a side view showing a vehicle appearance of the vehicle receiving apparatus of the present invention, (a) It means the situation of a 4-door car, and (b) means a 5-door car. 3(a)-(d) are longitudinal cross-sectional views showing the surface of the glass after cutting along the radial ribs. Φ Fig. 4 is an explanatory view showing a mode of the vehicle receiving apparatus of the present invention. The rear view showing the state of the door vehicle in which the radial rib of the third modification is placed in the rear view, and (b) shows the state of the five-door vehicle in which the radial rib of the second modification is placed in the rear view. (c) is a rear view showing a state in which a five-door vehicle having a radial rib according to a third modification is viewed from the rear, and (d) is a rear view showing a state of a five-door vehicle of a comparative example from the rear. Figure. U circle 6(a) is a graph showing the receiving characteristics of the vehicle of the present embodiment shown in Fig. 5(a) by the noise level of the frequency, and (8) is represented by the noise level of the frequency. Fig. 5(8) A graph of the receiving characteristics of the vehicle of the comparative example shown. 134470.doc -16- 200939558 Figure 7 shows that the noise source is not installed in the indoor power equipment of the vehicle of this embodiment, and the space electric field of the receiving frequency at the vertex position of the antenna element is simulated according to the thickness of the radial rib. A graph of the results of the intensity. [Main component symbol description] 1 Vehicle receiving device 10 Antenna 11 Antenna component 12 Radial rib 15 Coaxial cable 16 Receiver 17 Preamplifier 20, 20b, 20c, 20d Vehicle 21 Car top 25 Interior power equipment 30 Rear glass 31 hot line 32 defogging line Φ
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