1281765 九、發明說明： 【發明所屬之技術領域及先前技術】 本發明係關於天線用片狀線圈及片狀線圈型天線，尤 其係關於一種組裝在非接觸IC卡用讀寫器内使用的天線 用片狀線圈及片狀線圈型天線。 先前，人們所知的是利用磁場耦合、以非接觸方式進 行通訊的1C卡用讀寫器。在IC卡用讀寫器中，例如L裝 有專利文獻1中所記載的線圈型收發訊天線。該線圈型2 發訊天線，如圖20所示，是由天線用線圈1〇5與組裝該 天線用線圈105的電路基板13〇構成的。 天線用線圈105，由磁性體心11 〇與繞線丨2〇構成。 磁性體心110為平板狀，在其上面，沿著外周邊形成環狀 槽111。因此，在磁性體心110的中央部，相對凸出長方 體狀的軸柱112。 繞線120是以軸柱112作為捲心在其周圍捲繞複數圈 後被收容在環狀槽1 1 1中。繞線丨20的終端部丨2丨，丨22， 係從環狀槽111導出至外部，連接於未圖示的收發訊電路。 天線用線圈105，係設置在電路基板13〇的大致中央 4 °在電路基板130的下面，雖未圖示，但形成有大面積 的接地圖案。 ' 然而，習知天線用線圈105存在下述問題，亦即，從 軸柱112的開放上面指向上方的磁通密度較低，通訊時， 與1C卡間的距離短。為提高磁通密度來提高天線效率， 可能的對策就是增加繞線120的匝數，但如此將導致線圈 1281765 1 Ο 5本身的大型化，不是一個好的解決方法。 另外，由於在磁性體心1 1 〇的上面存在凹凸，因此在 將天線用線圈1 0 5構裝於電路基板1 3 〇上時，安裝機的吸 嘴無法確實的吸附天線用線圈1 05的上面。 [專利文獻1]特開平8-279714號公報。 【發明内容】 為此，本發明之目的在提供一種不會導致繞線的大型 化、可提高指向線圈上方之磁通密度以謀求提昇天線效率 的天線用片狀線圈、及使用該線圈的片狀線圈型天線。 又’除上述目的外，本發明之另一目的在提供一種構 衣於电路基板上時，能確實以安裝機之吸嘴進行吸附的小 型天線用片狀線圈、及使用該線圈的片狀線圈型天線。 為達到上述目的，本發明之天線用片狀線圈，係由磁 ^生體〜與捲繞於该磁性體心主體部之繞線構成；該磁性體 心，由下突緣部與相對該下突緣部垂直設置的主體部構 成，其特徵在於：該繞線的高度高於該磁性體心主體部的 面度。 根據以上結構，可產生以線圈軸為中心指向上方的磁 通，藉由將繞線的高度設定為高於主體部的高度，可在線 圈軸上使指向上方的磁通密度變高。另外，藉由磁性體心 的下突緣部形狀亦能控制水平方向的指向性。 換s之，本發明之天線用片狀線圈，即使其繞線的高 度與習知片狀線圈的繞線高度相同，但藉由降低磁性體心 的主體部高度，可避免招致繞線的大型化，使指向線圈上 1281765 方的磁通密度變高，而提昇天線效率。 本發明之天線用片狀線圈中，磁性體心的主體部高度 最好是在繞線高度的90%以上、未達1〇〇〇/〇，最理想的是 在93.3〜96.7%之間。 此外’最好是具有覆蓋磁性體心主體部之開放上面、 與繞線之上面的非磁性材料，該非磁性材料上面為平面 狀。藉由非磁性材料上面作為平面狀，在將天線用片狀線 圈構波在電路基板上時’可提安裝機之吸嘴的吸附性，且 防止以吸嘴進行吸附時繞線發生紊亂的現象。 又，在磁性體心主體部之外周面，設成錐 放上面的面積小於與下突緣部接合部分的面積。如此，可 進步增強從主體部的開放上面指向上方的磁通指向性。 又，該磁性體心的下突緣部與主體部可由不同材料構 成，構成下突緣部之村料的複相對導磁率的虛數部，在使 ^頻帶中，低於構成主體部之材料的複相對導磁率的虛數 部γ在與磁通往上方之指向性無直接關係的下突緣部使用 低損失的材料，不會使磁通的指向性惡化，並能提高天 效率。 Ί 再者，該磁性體心的下突緣部，可由易磁化軸配置在 :對下突緣部之主面平行方向的異向性磁性體構成，特別 疋可由六方晶肥粒鐵材料構成。若係顯示磁性異向性 的話，將易磁化軸配置在相對下突緣部之主面平行方向 則可使得從下突緣部的底面穿過底側的㈣磁通^於^ Zn系的肥粒鐵，從而可提高天線效率。 1281765 另一方面，本發明之片狀線圈型天線，其特徵在於， 具備··具有前述特徵的天線用片狀線圈，以及與該繞線之 終端部電氣連接的電極部。藉由以上構成，能獲得小型且 天線效率良好的片狀線圈型天線。又，亦可使用安裝機來 完成天線用片狀線圈的自動安裝。 本發明之片狀線圈型天線中，天線用片狀線圈最好是 複數個鄰近配置，各天線用片狀線圈係電氣連接，俾使各 天線用片狀線圈所產生的磁通為同一極性。據此，藉由分 別流通於天線用片狀線圈上之電流所產生的磁通，在相鄰 天線用片狀線圈之間被抵消，從而可等效地得到近似一個 大型線圈的磁通分布。因此，能夠加長與Ic卡的通訊距 離。 根據本發明的天線用片狀線圈，即使是與習知相同高 度的繞線，但由於指向線圈上方的磁通密度變高，所以能 加長與ic卡的通訊距離。其結果，能在避免大型化的情 形下，獲得天線效果良好的片狀線圈型天線。 【實施方式】 以下，參照圖式，對本發明之天線用片狀線圈及片狀 線圈型天線的實施例進行說明。 [第1實施例，圖1〜9] 圖1係片狀線圈型天、線i的外觀立體圖，w 2係其垂 直截面圖。片&線圈型天、線i，具有縱繞型的片狀線圈5。 片狀線圈5’係由下突緣部51a與主體部川構成的磁性 體心51、與捲繞在主體部51b上的繞線52與上面為平面 1281765 狀非磁性材料53構成。 磁性體心51的主體部51b，其底部與下突緣部 曰’且相對於下突緣部51a設置成垂直 ^ 5,係以主體…開放一為上側，二^ 於上側的開磁路型的線圈，具有天線線圈的功能。 繞線52，一般是在銅線施加聚氨酯等絕緣被臈的结 線。繞線52的兩個終端部52a，係以熱壓接等方法電: 接於從下錄部51a的底面形成至側面的電極6。又1 線52的向度被設定為略高於磁性體心51之主體部$卟的 同度，關於此點的作用效果將於後述。 又’非磁性材料53係形成為覆蓋主體部51b的開放上 面51ba與繞線52的上面。將非磁性材料53 &上面 平面狀的理由，如圖3所干，孫或、— 為 所不係為了在將片狀線圈型天線 1安裝在電路基板16上時，能夠確實的以安裝機的吸嘴加 以吸附’並防止在吸嘴進行吸附時繞線52發生紊亂的情 況。此非磁性材料53，例如，係將捲繞了繞線52的磁性 體心51從主體部51b的開放上面Mba側起浸潰在樹脂浴 中田在繞線52上部及主體部5 lb上部附著樹脂後，從 樹脂浴中拉起’再藉由光或熱使樹脂硬化而形成。又，此 時，為了在繞線52的外周面上亦形成樹脂，可將其浸潰 在樹脂浴中。另外’亦可透過板狀構件之貼合來形成非磁 性材料53。 於上面安裝片狀線圈型天線丨的電路基板丨6，例如， 如圖4所不，係組裝在非接觸IC卡用讀寫器3丨内。另外， 1281765 雖未圖示，但在電路基板16的上面，除片狀線圈型天線i 外，亦設有收發訊電路等。又，在電路基板16下面設有 大面積的接地電極。 少電路基板I6,係貼付在絕緣盒35的内側底面上。圖5， 係顯示以此方式所得之IC卡用讀寫器”的電路方塊圖。 、上述方式構成的片狀線圈型天線丨，由於從磁性體 心5!的主體部51b的開放上面主要指向上方(垂直方向)的 磁通Φ的指向性非常優異，因此即使是小型者，亦能加長 二1C卡2〇的通訊距離。另一方面，從主體部51底部出 來勺磁通φ ’ ±要係4過下突緣冑5 u從下突緣部侧面脫 離+因此，片狀線圈型天線1，係所發生的磁通φ不易使設 在電路基板16下面的大面積接地電極渦電流的構造。 為了進步增強從磁性體心5 1的主體部5 lb的開放上 才日向上方的磁通φ的指向性，如圖6所示，係使繞1281765 IX. Description of the Invention: [Technical Field and Prior Art of the Invention] The present invention relates to a chip coil and a chip coil antenna for an antenna, and more particularly to an antenna for use in a reader/writer for a non-contact IC card. A chip coil and a chip coil type antenna are used. Previously, a 1C card reader/writer that communicated by magnetic field and communicated in a non-contact manner was known. In the IC card reader/writer, for example, a coil type transmission antenna described in Patent Document 1 is mounted. As shown in Fig. 20, the coil type 2 transmitting antenna is composed of an antenna coil 1〇5 and a circuit board 13A on which the antenna coil 105 is assembled. The antenna coil 105 is composed of a magnetic core 11 〇 and a winding 丨 2 。. The magnetic core 110 has a flat plate shape, and an annular groove 111 is formed along the outer periphery thereof. Therefore, in the central portion of the magnetic core 110, the rectangular parallelepiped column 112 is relatively protruded. The winding 120 is housed in the annular groove 11 1 by winding the plurality of turns around the shaft column 112 as a core. The terminal portion 丨2丨 and 丨22 of the winding 丨20 are led out from the annular groove 111 to the outside, and are connected to a transmission circuit (not shown). The antenna coil 105 is provided on the lower surface of the circuit board 130 at substantially the center of the circuit board 13A. Although not shown, a large-area ground pattern is formed. However, the conventional antenna coil 105 has a problem that the magnetic flux density directed upward from the open top of the shaft post 112 is low, and the distance from the 1C card is short during communication. In order to increase the magnetic flux density to improve the antenna efficiency, a possible countermeasure is to increase the number of turns of the winding 120, but this will lead to an increase in the size of the coil 1281765 1 Ο 5 itself, which is not a good solution. Further, since the unevenness is present on the upper surface of the magnetic core 1 1 〇, when the antenna coil 1 0 5 is mounted on the circuit board 13 3 , the nozzle of the mounting machine cannot reliably adsorb the antenna coil 105. Above. [Patent Document 1] JP-A-8-279714. In view of the above, an object of the present invention is to provide a chip coil for an antenna which does not cause an increase in the size of the winding, and which can increase the magnetic flux density above the coil to improve the efficiency of the antenna, and a sheet using the coil. Coil type antenna. In addition to the above object, another object of the present invention is to provide a chip coil for a small antenna that can be surely adsorbed by a nozzle of a mounting machine when the device is coated on a circuit board, and a chip coil using the coil Antenna. In order to achieve the above object, the chip coil for an antenna according to the present invention comprises a magnetic body and a winding wound around the main body of the magnetic body; the magnetic core has a lower flange portion and a lower side. The main body portion of the flange portion is vertically disposed, and the height of the winding is higher than the surface of the main body portion of the magnetic body. According to the above configuration, the magnetic flux directed upward with the coil axis as the center can be generated, and by setting the height of the winding higher than the height of the main body portion, the magnetic flux density directed upward can be made higher on the coil axis. Further, the directivity of the horizontal direction can be controlled by the shape of the lower flange portion of the magnetic core. In other words, the chip coil for an antenna of the present invention can avoid the large size of the winding by reducing the height of the main body of the magnetic body core even if the height of the winding is the same as that of the conventional chip coil. The magnetic flux density of the 1281765 square on the pointing coil is increased, and the antenna efficiency is improved. In the chip coil for an antenna according to the present invention, the height of the main body portion of the magnetic core is preferably 90% or more of the winding height, less than 1 〇〇〇/〇, and most desirably between 93.3 and 96.7%. Further, it is preferable to have a non-magnetic material covering the open upper surface of the main body portion of the magnetic core and the upper surface of the winding, and the non-magnetic material has a flat surface. When the non-magnetic material is used as a planar surface, when the antenna-like chip coil is configured on the circuit board, the adsorption property of the nozzle of the mounting machine can be improved, and the winding disorder can be prevented when the suction is performed by the suction nozzle. . Further, on the outer peripheral surface of the main body portion of the magnetic core body, the area on the upper surface of the tapered portion is smaller than the area on the portion where the lower flange portion is joined. In this way, the magnetic flux directivity directed upward from the open top of the main body portion can be improved. Further, the lower flange portion and the main body portion of the magnetic core may be made of different materials, and the imaginary portion of the complex relative magnetic permeability of the village material constituting the lower flange portion may be lower than the material constituting the main body portion. The imaginary part γ of the complex relative magnetic permeability uses a material having a low loss in the lower flange portion which is not directly related to the directivity of the magnetic flux, and does not deteriorate the directivity of the magnetic flux, and can improve the efficiency of the sky. Further, the lower flange portion of the magnetic core may be disposed by an easy magnetization axis: an anisotropic magnetic body parallel to the main surface of the lower flange portion, and in particular, may be composed of a hexagonal crystal grain iron material. If the magnetic anisotropy is exhibited, the easy magnetization axis is disposed in a direction parallel to the main surface of the lower flange portion, so that the (four) magnetic flux from the bottom surface of the lower flange portion passes through the bottom side. Granular iron, which improves antenna efficiency. A chip coil type antenna according to the present invention is characterized in that the chip coil for an antenna having the above-described characteristics and an electrode portion electrically connected to a terminal portion of the winding are provided. According to the above configuration, it is possible to obtain a chip-like coil type antenna which is small in size and excellent in antenna efficiency. Alternatively, the mounting machine can be used to complete the automatic mounting of the antenna chip coil. In the chip coil type antenna of the present invention, it is preferable that the antenna chip coils are arranged in a plurality of adjacent positions, and the antenna coils are electrically connected to each other, so that the magnetic fluxes generated by the chip coils of the respective antennas have the same polarity. As a result, the magnetic flux generated by the currents flowing through the patch coils for the antennas is canceled between the adjacent antenna patch coils, so that the magnetic flux distribution of approximately one large coil can be equivalently obtained. Therefore, the communication distance with the Ic card can be lengthened. According to the chip coil for an antenna of the present invention, even if the winding is of the same height as the conventional one, the magnetic flux density above the pointing coil is increased, so that the communication distance with the IC card can be lengthened. As a result, it is possible to obtain a chip coil type antenna having an excellent antenna effect while avoiding an increase in size. [Embodiment] Hereinafter, an embodiment of a chip coil and a chip coil antenna for an antenna according to the present invention will be described with reference to the drawings. [First Embodiment, Figs. 1 to 9] Fig. 1 is an external perspective view of a chip coil type day and line i, and w 2 is a vertical sectional view thereof. The sheet & coil type day, line i has a longitudinally wound sheet coil 5. The chip coil 5' is composed of a magnetic core 51 composed of a lower flange portion 51a and a main body portion, a winding 52 wound around the main body portion 51b, and a non-magnetic material 53 having a flat surface 1281765. The main body portion 51b of the magnetic core 51 has a bottom portion and a lower flange portion 曰' and is disposed perpendicular to the lower flange portion 51a, and is opened on the upper side, and is opened on the upper side. The coil has the function of an antenna coil. The winding 52 is generally formed by applying an insulating bedding such as polyurethane to the copper wire. The two end portions 52a of the winding 52 are electrically connected to the electrode 6 formed from the bottom surface of the lower recording portion 51a to the side surface by thermocompression bonding or the like. Further, the dimension of the first line 52 is set to be slightly higher than the same degree of the main body portion 卟 of the magnetic core 51, and the effect of this point will be described later. Further, the non-magnetic material 53 is formed to cover the upper surface 51ba of the main body portion 51b and the upper surface of the winding 52. The reason why the non-magnetic material 53 & planar shape is as shown in Fig. 3, Sun or, is not intended to be a mounting machine when the chip coil antenna 1 is mounted on the circuit board 16. The nozzle is adsorbed' and prevents the winding 52 from being turbulent when the nozzle is adsorbed. This non-magnetic material 53 is, for example, a magnetic body 51 around which the winding 52 is wound, is immersed from the open upper surface Mba side of the main body portion 51b in the resin bath, and the resin is attached to the upper portion of the winding 52 and the upper portion of the main body portion 5b. Thereafter, it is pulled from the resin bath and formed by hardening the resin by light or heat. Further, in this case, in order to form a resin on the outer peripheral surface of the winding 52, it may be immersed in a resin bath. Further, the non-magnetic material 53 can also be formed by bonding of the plate members. The circuit board 6 on which the chip coil type antenna 安装 is mounted is mounted in the non-contact IC card reader/writer 3, for example, as shown in FIG. Further, although 1281765 is not shown, a transmission circuit or the like is provided on the upper surface of the circuit board 16 in addition to the chip coil type antenna i. Further, a large-area ground electrode is provided under the circuit board 16. The less circuit board I6 is attached to the inner bottom surface of the insulating case 35. Fig. 5 is a circuit block diagram showing the IC card reader/writer which is obtained in this manner. The chip coil type antenna 构成 constructed as described above mainly points from the open upper surface of the main body portion 51b of the magnetic body core 5! The directivity (vertical direction) of the magnetic flux Φ is very excellent, so even a small one can lengthen the communication distance of the 2C card. On the other hand, the magnetic flux φ ' from the bottom of the main body portion 51 is required. The system 4 is separated from the side of the lower flange portion by the lower flange 胄 5 u. Therefore, the magnetic flux φ generated by the chip coil type antenna 1 is less likely to cause the eddy current of the large-area ground electrode provided under the circuit board 16 In order to improve the directivity of the magnetic flux φ from the opening of the main body portion 5 lb of the magnetic body core 51 to the upper side, as shown in FIG.
線52的高度m高於主體部川的高度H2。此時，雖Z 在^體部51b的開放上面池與繞線52的上面之間會形 成f差h，但例如藉由將開放上面心的非磁性材料μ 勺厚度加厚，即能確保非磁性材料5 3上面的平坦性。 圖7〜圖11係顯示相對於繞線52的高度Η1(固定為 3·0^) ’將主體部2的高度Η2漸漸降低時線圈軸上的磁 又圖中，掄軸代表從線圈最上部Ζ(參照圖6)起瞀的 高度，縱轴代表磁通密度。 开的 圖7中，特性曲線Α係顯示將主體部5 lb的高度Η】 設定為2.9mm(段差h=〇lmm)時的磁通密度。圖8中又，特 1281765 性曲線B係顯示將主體部51b的高度H2設定為2 8mm(段 差h=〇.2mm)時的磁通密度。圖9中，特性曲線c係顯示 將主體部51b的高度H2設定為2·7_(段差h==〇 3mm)時的 磁通密度。圖ίο中，特性曲線D係顯示將主體部51b的 高度H2設定為2.6mm(段差h=〇_4mm)時的磁通密度。圖！ 1 中，特性曲線E係顯示將主體部5 lb的高度H2設定為 2.5mm(段差h=〇.5mm)時的磁通密度。 又，圖7〜圖11中，為了便於分別比較，係以虛線之 特性曲線F來顯不H1=H2(段差h=0)時的磁通密度。 _ 此時，片狀線圈5的電感都是〇·944μΗ，設磁性體心 51的相對導磁率為16〇〇，於繞線52上流過ι 〇α的電流。 進一步的，尚度H2之3.0mm的繞線52的捲繞數是1〇匝。 山攸上述圖7〜圖11中可清楚地看到，相對繞線52的 向度H1將主體部51b的高度H2逐漸降低，在繞線52的 ^由上扎向上方的磁通密度變高，從而提高了天線效率。但 疋田主體部51b的高度H2降低到2.6mm(參照圖1〇)或 -i 2.5mm(參照圖11)左右時，在線圈最上部z附近的 · 磁通密度大，而在稍稍離開處之磁通密度，則與段差h气 的情況相等，或降低。 因此，主體部51b的高度H2，最好是在繞線52的高 又Hl白勺90%以上、未達100%，理想的是在93·3〜96.7% 之間。 又’為了在不降低磁通φ指向性的情形下，提高磁通小 、 射放率（天線效率），係將磁性體心5 1的下突緣部5 1 a 11 1281765 與主體部51b分別由不同的材料製作。並且，將構成下突 緣部5U之材料的複相對導磁率的虛數部，於片狀線圈型 天線1之使用頻帶上，設定成低於構成主體部5ib之材料 的複相對導磁率的虛數部。亦即’與磁通小上方的指向性 無直接關係的下突緣部5 la，使用低損失的材料。例如， 若係用於1C卡用碩寫器的情形時，材料的選定，以其在 13.56MHz頻帶中，構成下突緣部5U之材料的複相對導磁 率的虛數’低於構成主體部51b之材料的複相對導磁率的 虛數部之方式進行即可。 _ 另外，作為另一提高天線效率的方法，可使用異向性 磁性體（例如六方晶肥粒鐵材料）來製作磁性體心Η之下突 緣部51a，該異向性磁性體係將易磁化軸配置在相對下突 P 面平行方向。由於六方晶肥粒鐵材料顯示了磁的 異向性，所以，藉由將易磁化軸配置在相對下突緣部5 & 之主面平行方向，從下突緣部5U底面穿過底側的洩漏磁 通將少於N卜Zn系的肥粒鐵。因此，洩漏磁通將難以到達 认在電路基板16下面的大面積接地電極，在接地電極之 _ 屑也流損失較少。據此，磁通φ的輻射效率不會變差，而 月匕加長與1C卡20的通訊距離。 [第2實施例及第3實施例圖12及圖13] 圖12所不的片狀線圈型天線丨a，具備：具有圓板狀 下突緣部51a的磁性體心51。又，圖13所示的片狀線圈 型天線1B ’具備：具有稜柱形主體部5 lb的磁性體心5 1。 此等片狀線圈5，未在下突緣部51a形成電極，繞線52的 12 1281765 終端部52a被導出 [第4實施例 至外部並焊接於設在電路基板之電極圖14] 〇 係以非磁性外殼6 J 上面與繞線5 2的上 圖14所示的片狀線圈型天線1C， 覆蓋磁性體心51之主體部51b的開放 面。非磁性外殼61的上面是平坦的。 第5實施例圖16及圖17]The height m of the line 52 is higher than the height H2 of the body portion. At this time, although the f-d difference h is formed between the open upper surface of the body portion 51b and the upper surface of the winding 52, for example, by thickening the thickness of the non-magnetic material μ-sp. The flatness of the magnetic material 53. 7 to 11 show the height Η1 (fixed to 3·0^) with respect to the winding 52. When the height Η2 of the main body portion 2 is gradually lowered, the magnetic force on the coil shaft is shown in the figure, and the 抡 axis represents the uppermost portion of the coil. Ζ (refer to FIG. 6) the height of the ridge, and the vertical axis represents the magnetic flux density. In Fig. 7, the characteristic curve 显示 shows the magnetic flux density when the height 主体 of the main body portion 5 lb is set to 2.9 mm (step difference h = 〇 l mm). Further, in Fig. 8, the characteristic curve B1 shows the magnetic flux density when the height H2 of the main body portion 51b is set to 28 mm (segment difference h = 〇. 2 mm). In Fig. 9, the characteristic curve c shows the magnetic flux density when the height H2 of the main body portion 51b is set to 2·7_ (segment difference h == 〇 3 mm). In the graph, the characteristic curve D shows the magnetic flux density when the height H2 of the main body portion 51b is set to 2.6 mm (step difference h = 〇 4 mm). Figure! In Fig. 1, the characteristic curve E shows the magnetic flux density when the height H2 of the main body portion 5 lb is set to 2.5 mm (step difference h = 5. 5 mm). Further, in Fig. 7 to Fig. 11, in order to facilitate the comparison, the magnetic flux density at the time of H1 = H2 (segment difference h = 0) is shown by the characteristic curve F of the broken line. At this time, the inductance of the chip coil 5 is 944·944 μΗ, and the relative magnetic permeability of the magnetic core 51 is 16 〇〇, and the current of the ια flows through the winding 52. Further, the number of windings of the winding 52 of 3.0 mm of the degree H2 is 1 〇匝. In the above-mentioned Figs. 7 to 11, it can be clearly seen that the height H2 of the main body portion 51b is gradually lowered with respect to the directionality H1 of the winding 52, and the magnetic flux density is increased upward on the winding 52. , thereby improving antenna efficiency. However, when the height H2 of the main body portion 51b is lowered to 2.6 mm (see FIG. 1A) or -i 2.5 mm (see FIG. 11), the magnetic flux density near the uppermost portion z of the coil is large, and is slightly separated. The magnetic flux density is equal to or lower than the case of the step difference h gas. Therefore, the height H2 of the main body portion 51b is preferably 90% or more of the height H1 of the winding 52, less than 100%, and desirably between 93.3 and 96.7%. Further, in order to increase the magnetic flux small and the radiation rate (antenna efficiency) without lowering the magnetic flux φ directivity, the lower flange portion 5 1 a 11 1281765 of the magnetic core 5 1 and the main body portion 51b are respectively Made of different materials. Further, the imaginary part of the complex relative magnetic permeability of the material constituting the lower flange portion 5U is set to be lower than the imaginary part of the complex relative magnetic permeability of the material constituting the main body portion 5ib in the use band of the chip coil type antenna 1. . That is, the lower flange portion 5 la which is not directly related to the directivity above the magnetic flux uses a material having a low loss. For example, in the case of a 1C card master, the material is selected such that the imaginary number of the complex relative permeability of the material constituting the lower flange portion 5U is lower than the constituent body portion 51b in the 13.56 MHz band. The imaginary part of the complex relative magnetic permeability of the material may be carried out. _ In addition, as another method of improving the efficiency of the antenna, an anisotropic magnetic body (for example, a hexagonal crystal grain iron material) may be used to form a flange portion 51a under the magnetic heart, which is easy to magnetize. The shaft is arranged in a direction parallel to the opposite P-plane. Since the hexagonal crystal grain iron material exhibits magnetic anisotropy, the bottom surface of the lower flange portion 5U passes through the bottom side by arranging the easy magnetization axis in a direction parallel to the main surface of the lower flange portion 5 & The leakage flux will be less than that of the N-Zn system. Therefore, it is difficult for the leakage magnetic flux to reach the large-area ground electrode which is recognized under the circuit board 16, and the flow loss of the swarf at the ground electrode is also small. Accordingly, the radiation efficiency of the magnetic flux φ does not deteriorate, and the lunar length increases the communication distance with the 1C card 20. [Second Embodiment and Third Embodiment Figs. 12 and 13] The chip coil type antenna 丨a shown in Fig. 12 includes a magnetic core 51 having a disk-shaped lower flange portion 51a. Further, the chip-like coil antenna 1B' shown in Fig. 13 is provided with a magnetic body core 51 having a prismatic body portion 5 lb. The chip coils 5 are not formed with electrodes on the lower flange portion 51a, and the terminal portion 52a of the 12 1281765 of the winding 52 is led out [the fourth embodiment to the outside and soldered to the electrode provided on the circuit board.] The chip-like coil type antenna 1C shown in FIG. 14 above the magnetic housing 6 J and the winding 52 covers the open surface of the main body portion 51b of the magnetic core 51. The upper surface of the non-magnetic outer casing 61 is flat. Fifth Embodiment FIG. 16 and FIG. 17]
圖15所不的片狀線圈型天線1D，於磁性體心η 體部川，以開放上面_之面積小於與下突緣部5u去 口之底面面積的方式’在主體部51的外周面5⑽設有到 面°據此，能進—步增強從磁性體心51之主體部51b ^ 開放上面51ba指向上方之磁通+的指向性。 圖丨6係前述片狀線圈型天線1D的磁通密度分佈。圖 16中，橫軸係顯示距繞線52中心軸的距 係顯示距電路基板16表狀高度H3(參關6)為曲6=： 位置處的磁通密度分佈。同樣的，特性曲線G2、G3、以、 G5刀別頌示距電路基板16表面之高度為7.5mm、The chip coil type antenna 1D shown in Fig. 15 is in the body of the magnetic core η, and the outer surface of the main body portion 51 (10) is such that the area of the open upper surface is smaller than the area of the bottom surface of the lower flange portion 5u. According to this, it is possible to further enhance the directivity of the magnetic flux + pointing upward from the main body portion 51b of the magnetic core 51 to the upper surface 51ba. Fig. 6 is a magnetic flux density distribution of the chip coil type antenna 1D. In Fig. 16, the horizontal axis shows the distance from the central axis of the winding 52. The magnetic flux density distribution at the position of the curved height H3 (the reference 6) from the circuit board 16 is changed to the position of the curve 6 =:. Similarly, the characteristic curves G2, G3, and G5 have a height of 7.5 mm from the surface of the circuit board 16.
8.5mm、9.5mm、l〇.5mm位置處的磁通密度分佈。 此叶片狀線圈5的電感為〇·944μΗ，磁性體心51的 相對導磁率為1600，在繞線52上流動1〇A的電流。繞線 52的捲繞數為12_1匝。 [第6實施例圖17及圖18] 如圖1 7所示，片狀線圈型天線80係將複數個（4個）片 狀線圈5以軸對稱方式設置在電路基板16上。各片狀線 圈5可串聯連接，亦可並聯連接，但係構成為因各片狀線 13 1281765 圈5而產生的磁通為同_極性。 據此，因分別流過片狀線圈5之電流所產生的磁通， 在相鄰的片狀線圈5間的部分被抵消，從而可等效地獲得 近似一個大型線圈的磁通分布。因此，能夠加長與ic卡2〇 的通訊距離。再者，此時如圖18所示，當將片狀線圈5 暫時安裝在磁性體基板85上、再裝在電路基板16上並加 以配線時，由於磁通之抵消更為確實，因此能得到更顯著 的效果。其結果，能夠擴大片狀線圈型天線8〇與IC卡2〇 的通訊距離。 [其他實施例] · 本發明的天線用片狀線圈及片狀線圈型天線，並不僅 限於上述實施例，在其主旨範圍内可進行各種變更。 例如，一般係在繞線52上使用被覆有聚氨酯的軟銅線 等，但亦可預先捲繞如圖丨9所示的片狀平板繞線52，並 將其肷入磁性體心5 1的主體部5 1 b内。此外，主體部5 j b 亚不僅限於圓柱狀，亦可採用稜柱狀或橢圓柱狀。 【圖式簡單說明】 第1圖’係顯示本發明的片狀線圈型天線的第1實施 例的立體圖。 第2圖’係第丨圖所示之片狀線圈型天線的垂直截面 圖。 第3圖’係顯示將第i圖所示之片狀線圈型天線安裝 在電路基板上之狀態的立體圖。 第4圖’係裝有第丨圖所示之片狀線圈型天線之ic卡 14 1281765 用讀寫器的概略構成圖。 第7圖 第8圖 第9圖 第10圖 第11圖 第12圖 例的立體圖 第13圖 例的立體圖 第14圖 例的戴面圖 第15圖 例的截面圖， 第16圖 第17圖 例的立體圖· 第18圖 第19圖 第20圖 :5圖’係第4圖所示之IC卡用讀寫器的電路方塊圖。 古弟6圖’係顯示第i圖所示之片狀線圈型天線的繞線 X”磁11體、的主體部南度關係的局部放大截面圖。 係顯示線圈軸上的磁通密度的圖表。 係顯示線圈軸上的磁通密度的圖表。 係顯示線圈軸上的磁通密度的圖表。 ，係顯示線圈軸上的磁通密度的圖表。Magnetic flux density distribution at 8.5mm, 9.5mm, l〇.5mm position. The inductance of the blade coil 5 is 944·944 μΗ, and the relative magnetic permeability of the magnetic core 51 is 1600, and a current of 1 〇A flows through the winding 52. The number of windings of the winding 52 is 12_1 匝. [Sixth Embodiment Figs. 17 and 18] As shown in Fig. 17, the chip coil type antenna 80 is provided with a plurality of (four) chip coils 5 on the circuit board 16 in an axisymmetric manner. Each of the sheet coils 5 may be connected in series or in parallel, but is configured such that the magnetic flux generated by the respective strip lines 13 1281765 turns 5 is the same polarity. According to this, the magnetic flux generated by the current flowing through the chip coil 5 is partially canceled by the portion between the adjacent chip coils 5, so that the magnetic flux distribution of approximately one large coil can be equivalently obtained. Therefore, the communication distance with the IC card 2〇 can be lengthened. Further, at this time, as shown in FIG. 18, when the chip coil 5 is temporarily mounted on the magnetic substrate 85 and then mounted on the circuit board 16 and wired, since the cancellation of the magnetic flux is more reliable, it is possible to obtain More significant results. As a result, the communication distance between the chip coil type antenna 8A and the IC card 2A can be increased. [Other Embodiments] The chip coil and the chip coil antenna for an antenna according to the present invention are not limited to the above-described embodiments, and various modifications can be made without departing from the spirit and scope of the invention. For example, a soft copper wire coated with polyurethane or the like is generally used for the winding 52, but the sheet-like flat wire 52 shown in Fig. 9 may be wound in advance and inserted into the main body of the magnetic body 5 1 . Part 5 1 b. Further, the main body portion 5 j b is not limited to a cylindrical shape, and may be a prismatic shape or an elliptical cylindrical shape. BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a perspective view showing a first embodiment of a chip coil antenna of the present invention. Fig. 2 is a vertical sectional view of the chip coil type antenna shown in Fig. 。. Fig. 3 is a perspective view showing a state in which the chip coil type antenna shown in Fig. i is mounted on a circuit board. Fig. 4 is a schematic view showing a configuration of a reader/writer equipped with a chip coil type antenna shown in Fig. 14 1281765. Fig. 7 Fig. 8 Fig. 9 Fig. 10 Fig. 11 Fig. 12 Fig. 12 is a perspective view of Fig. 13 is a perspective view of Fig. 14 A cross-sectional view of Fig. 15 is a cross-sectional view of Fig. 15 and Fig. 16 is a perspective view of Fig. 17 Fig. 19Fig. 20: Fig. 5 is a circuit block diagram of the IC card reader shown in Fig. 4. Fig. 6 is a partially enlarged cross-sectional view showing the south relationship of the main body portion of the winding X" magnetic 11 body of the chip coil type antenna shown in Fig. i. A graph showing the magnetic flux density on the coil axis A graph showing the magnetic flux density on the coil axis. A graph showing the magnetic flux density on the coil axis. A graph showing the magnetic flux density on the coil axis.
，係顯示線圈軸上的磁通密度的圖表。 係顯不本發明的片狀線圈型天線的第2實施, is a graph showing the magnetic flux density on the coil axis. A second implementation of the chip coil antenna of the present invention
係線不本發明的片狀線圈型天線的第3實方 係顯示本發明的片狀線圈型天線的第4實方 係,、、、員不本發明的片狀線圈型天線的第5實： 係顯不第5實施例中磁通密度分佈的圖表 係.、、、員不本發明的片狀線圈型天線的第6實 係顯示第6實施例之變形例的立體圖。 係顯示繞線之變形例的立體圖。 主要元件符號說明】 係顯示習知線圈型天線的立體圖。 15 1281765 1，1A 〜1D，80 片狀線圈型天線 5 片狀線圈 6 電極 51 磁性體心 51a 下突緣部 51b 主體部 5 lba 開放上面 5 lbb 外周面 52 繞線 53 非磁性材料 61 非磁性外殼 HI 繞線向度 H2 磁性體心的主體部局度The third real system of the chip coil type antenna of the present invention is not shown in the third embodiment of the chip coil type antenna of the present invention, and the fifth embodiment of the chip coil type antenna of the present invention is not provided. The graph showing the magnetic flux density distribution in the fifth embodiment is a perspective view showing a modification of the sixth embodiment in the sixth embodiment of the chip coil antenna of the present invention. A perspective view showing a modification of the winding. Explanation of main component symbols] A perspective view showing a conventional coil type antenna. 15 1281765 1,1A ~1D,80 Chip coil antenna 5 Chip coil 6 Electrode 51 Magnetic core 51a Lower flange portion 51b Main body portion 5 lba Open upper surface 5 lbb Outer peripheral surface 52 Winding 53 Non-magnetic material 61 Non-magnetic Shell HI winding degree H2 magnetic body center of the body
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