1238429 玖、發明說明： 【發明所屬之技術領域】 本發明，係關於在異常時利用低熔點金屬體的炼斷來 切斷電流之保護元件。 【先前技術】 就不僅可防止過電流亦可防止過電壓之保護元件而言 ，周知的有··在基板上積層發熱體與低熔點金屬體（熔絲 部）而成之保護元件（例如，參考日本專利279〇433號公報 、曰本專利特開平8-16199〇號公報）。揭示於該等專利文 獻之保護元件，在異常時發熱體會通電，#由發熱體之發 熱，來使低熔點金屬體熔融。熔融之低熔點金屬體，對於 載置有低溶點金屬體的電極表面具有良好的沾濕性，會被 拉到電極上’結果，因低熔點金屬體的熔斷而將電流切斷 ▲就此類保言蔓元件之低熔點金屬體與發熱體的連接形態 而言，如日本專利特開平1〇—1 16549號公報或特開平⑺一 1 1 6550 , 體’而係將低炼點金屬體與發熱體平面配設連接於基板上 ’其在低熔點金屬體熔斷的同時，亦將發熱體的通電切斷 之效果相同。 然而，隨著可搾⑽ 网式機器之小型化，對於此類保護元件 亦要求薄型化，而帛 π从達成該目的的手段之一，提案有： 在基板上配置炫轉 、糸（低熔點金屬體），並以絕緣蓋板與樹脂 將其密封，藉此，來、去丄 水建成薄型化的方法（例如，參考曰本 1238429 專利特開平11-111138號公報）。該專利文獻記載之基板型 溫度熔絲，係於基板單面形成熔絲安裝用膜電極，在該膜 電極間橋接低㈣可炼合金[冑助焊㈣布純溶點可 熔合金片，將外圍較基板小的絕緣蓋板配置於基板單面上 ，將密封樹脂充填於該絕緣蓋板周圍端部與基板周圍端部 的間隙，並將絕緣蓋板周圍緣端與基板周圍緣端間之密封 樹脂外面設成凹曲傾斜面或直線傾斜面。 然而，如日本專利特開平U_1U138號公報記載般， 就抓用以絕緣蓋板與樹脂進行密封而薄型化的方法而言， 由於用來收容低熔點金屬體的空間變小，並且，隨著小型 έ有電極面積亦變小的傾向，而有炫斷部良之虞。即， 刖述之基板型㈣如前述般，利用在基板上的電極膜溶融 之熔絲元件(低熔點金屬體)的流入而熔斷。此時，若在電 極面積夠大’並能確保電極上的體積之情形，並不會造成 太大問題’惟若非該情形時，則會有即使溶絲元件溶融仍 …、熔斷的狀況發生。此係由於熔融的熔絲元件流入電極 f會產生從其高度方向隆起的現象，而無法充分將熔融 的炫絲元件拉到電極，故產生在吐出之熔融熔絲元件間接 觸等現象。 近年來，機器越來越朝向小型化、薄型化的方向進展 因此’對於該保護元件進一步小型化、薄型化的要求中 、”述問題則變為更嚴重。&，由於高電流規格化，而有 T 、元件的截面積擴大的傾向，此點亦使上述問題變為更 嚴重而期待解決之道。 1238429 本發明’係有蓉於琴羽4 方…亥白知情況而提出者，其目的传接 =:可確保對炫融的熔絲部（低炼點金屬體）充分的附著面 積二會有熔絲部炼斷不良的發生，在異常時可確實地切 斷電流’並具有穩定的動作特性之保護元件。 【發明内容】 …為達成上述目#，本發明之保護元件，係具有 ’第卜帛2電極，係配置成於該基板上彼此分離^ 絲部，係以低熔點金屬體構成，且跨設於該第丨、 極:且利:該熔絲部的熔斷，來切斷通過該熔 = =且’在該第卜第2電極上配置蓋板；在該蓋板之= 電極上的位置，配置第1金屬圖案。 本發明之保護元件，其中，在該蓋板之第2 位置，配置與第1金屬圖案分離之第2金屬圖案。 本發明之保護元件，其中，以近接於該熔絲部 :置發熱體’當電流通過該發熱體而使其發熱 ： 絲部炼斷。 、彳將溶 本發明之保護元件，其中，該第丨、 的距離，係較該第！、帛2電極間的距離為小。圖案間 本發明之保護元件，其中，該第丨、 的距離係0.2mm。 金屬圖案間 本發明之保護元件，其中，該基板之第丨、 配置面和'絮4c: Z電極 面I玄盡板之苐丨金厲圖案配置面間的距 絲部厚度的1.2〜4倍。 係遠熔 本發明之保護元件，其中，該第丨、 第2電極的表面 1238429 第 。亥第1金屬圖案的表面，其沾濕性較露出於 電極間的表面為高。 本叙明之保護元件，其中’該第卜 與該第1、第2金屬甘k ^的表面 、金屬圖案的表面，其沾濕性較露出於該第j 弟2電極間的表面為高。 弟 低熔之保護元件’於絕緣蓋板亦可形成對熔融的 -孟屬體顯示良好沾濕性之金屬圖案。 構成’基板或絕緣蓋板係以陶究、玻璃、樹脂等 基板…： 電極間的表面，例如相較於 二：么於在第1、第2電極或金屬圖案表面熔融的 溶融之rt，因此，在異常時低炫點金屬體 m: 不僅可將熔融的低熔點金屬拉到電極，並 可將其拉到金屬圖案的作用。 卫 形，=丨！如即：在收容低熔點金屬體的空間較小的情 ，將並、二逆士以所明毛細官現象的形態熔融的低炫點金屬 :二快速地拉到電極與金屬圖案間的間隙， 也 將低熔點金屬體熔斷。 ’耳 ’未限於基板表面， 表面，對熔融狀態的 亦可使其露出於形成 露出於第卜帛2電極間的表面 若較第1、第2電極表面及金屬圖索 低熔點金屬體具有較低的沾濕性，則 在基板上的保護膜。 【實施方式】 以下 參照圖式來詳細說明適 用於本發明 之保護元件 1238429 第1圖，係表示適用於本發明之保護元件之-例（第i ΛH ) X ’第1圖係在卸下絕緣蓋板後的狀態下之 俯視圖。本例之保護元件，係所謂的基板型保護元件(基 板31炼4 )纟既疋大小的基板i ±，將炼絲部2與發熱體 (加熱器）3近接並排配置；該炫㈣2，係具有利用熔斷來 切斷電流之作為熔絲的效果；該發熱冑3，係用來於異常 時發熱而使該熔絲部2熔融者。 在此作為板1的材質，只要係具有絕緣性者皆可， ，]可使用陶竞基板、玻璃環氧基板般之印刷配線基板 ，使用之基板、玻璃基板、樹脂基板，絕緣處理金屬基板 等八中以耐熱性優異、導熱性佳之絕緣基板之陶竟基 板為佳。 又’以作為具有熔絲功能之炫絲部2之形成材料而言 °使用省知作為熔絲材料用之各種低熔點金屬，例如， :使用記載於日本專利特開平8_161_號公報之表i的合 人八體而5，例如，BiSnPb合金、BiPbSn合金、Bipb 7° A金、BlSn合金、SnPb合金、SnAg合金、PbIn合金、 =合金、InSn合金、ρ_η合金等。又， 形狀可為薄片狀或棒狀。 的 發熱體3，例如 水玻璃等|機w導電材料與 所槿 、、’、、，、°合劑、或熱硬化性樹脂等有機系結合劑 ::之::Γ，按照需要來燒製而成…卜，亦可將 形成；亦二二，利用印刷'電鑛、蒸錄、賤錄等來 由貼合、積層這些薄膜等來形成。 1238429 _在基板1表面，形成該炫絲部2用且彼此分離之-對 昆極4、5(第1、第2電極）、以 a n 乂及该發熱體用的一對電極 6、7 ’炼絲部2或發熱體3得以、垂私 n 、 係从連接於電極4、5或電極6 、7的方式形成。又，在各 ， 5、6、7分別連接引線 8、9、1 〇、11來作為外部端子。 就熔融之熔絲部2 人& # ^ 成之電極，亦即熔絲部2用 之電極4、5的構成材料而古，计也& 1:1 並無特別限制，可使用與 熔融狀態的熔絲部2具有良好沾濕性者。1238429 (1) Description of the invention: [Technical field to which the invention belongs] The present invention relates to a protective element that cuts off a current by using a smelting of a low-melting-point metal body when abnormality occurs. [Prior art] As for a protection element that can prevent not only an overcurrent but also an overvoltage, a well-known protection element (eg, a heating element and a low-melting-point metal body (fuse part) laminated on a substrate (for example, (Refer to Japanese Patent No. 279040, Japanese Patent Laid-Open No. 8-161990). The protective elements disclosed in these patent documents, when the abnormality occurs, the heating element will be energized, and the low-melting metal body will be melted by the heating of the heating element. The molten low melting point metal body has good wettability to the surface of the electrode on which the low melting point metal body is placed, and will be pulled on the electrode. As a result, the current is cut off due to the melting of the low melting point metal body. As for the connection form of the low-melting-point metal body of the vine element and the heating element, such as Japanese Patent Laid-Open No. 10-1 16549 or Japanese Patent Laid-Open No. 1 1 6550, the low-melting point metal body and the The heating element is arranged on the plane and is connected to the substrate. At the same time that the low-melting metal body is melted, the effect of cutting off the heating element is also the same. However, with the miniaturization of squeezeable ⑽ net type machines, such protective elements are also required to be thinner. One of the means to achieve this goal is to provide: Metal body), and sealed with an insulating cover plate and a resin to thereby reduce the thickness of the water (for example, refer to Japanese Patent No. 1238429, Japanese Patent Laid-Open No. 11-111138). The substrate-type temperature fuse described in this patent document is formed on one side of the substrate to form a membrane electrode for fuse installation, and a bridge between low-temperature smelt alloys and pure smelt-point fusible alloy sheets is made between the film and electrodes. The insulating cover with a smaller periphery than the substrate is arranged on one side of the substrate, and the sealing resin is filled in the gap between the peripheral end of the insulating cover and the peripheral end of the substrate, and the distance between the peripheral edge of the insulating cover and the peripheral edge of the substrate is filled. The outer surface of the sealing resin is formed as a concave curved surface or a linear inclined surface. However, as described in Japanese Patent Application Laid-Open No. U_1U138, in the method for grasping and thinning an insulating cover plate and a resin to reduce the thickness, the space for accommodating a low-melting-point metal body becomes smaller, and as the size becomes smaller, There is a tendency that the electrode area also becomes smaller, and there is a risk that the broken part is good. That is, the substrate type described above is blown by the inflow of a fuse element (low-melting-point metal body) in which the electrode film on the substrate is melted as described above. At this time, if the electrode area is large enough and the volume on the electrode can be ensured, it will not cause much problem. However, if this is not the case, there will be a situation that the melting wire element is still melted ... This is because the molten fuse element flows into the electrode f, and it may swell from the height direction, and it is impossible to sufficiently pull the molten fuse element to the electrode, so the phenomenon that the molten fuse element discharged indirectly contacts and so on occurs. In recent years, machines are becoming more and more miniaturized and thinner. Therefore, the "requirements for further miniaturization and thinness of this protective element" have become more serious. &Amp; Due to high current standardization, There is a tendency for T and the cross-sectional area of the element to increase, which also makes the above problem more serious and it is expected to be solved. 1238429 The present invention is proposed by Rong Yuqin Yu Fang ... Purpose transmission =: It can ensure a sufficient adhesion area to the fused fuse part (low-melting point metal body). Second, there will be a failure of the fuse part to break, and it can reliably cut off the current when abnormal. [Properties of the invention] ... In order to achieve the above-mentioned objective #, the protective element of the present invention has a 'second electrode 2', which is arranged to be separated from each other on the substrate ^ The wire portion is a low melting point It is made of a metal body, and is located across the first and second poles: and Lee: the fuse part is blown to cut through the fuse = = and 'the cover plate is arranged on the second electrode; on the cover plate Where = the position on the electrode, the first metal is arranged In the protection element of the present invention, a second metal pattern separated from the first metal pattern is disposed at the second position of the cover plate. The protection element of the present invention, wherein the protection element is located close to the fuse part: heat generation When the current passes through the heating element to cause it to heat up: the wire section is broken. 断 will dissolve the protective element of the present invention, wherein the distance between the first and second electrodes is longer than the distance between the first and second electrodes. Small. The protective element of the present invention between the patterns, wherein the distance between the first and second electrodes is 0.2 mm. The protective element of the present invention between the metal patterns, wherein the substrate, the arrangement surface, and the substrate 4c: Z electrode surface I The thickness of the XuanJian plate 丨 the thickness of the wire part between the surface of the gold pattern arrangement is 1.2 to 4 times. It is the protective element of the present invention, wherein the surface of the first and second electrodes is 1238429. The first metal The surface of the pattern has higher wettability than the surface exposed between the electrodes. The protective element described in this description includes the surface of the first and second metal gates, the surface of the metal pattern, and the surface of the metal pattern. Wetness is more exposed on the surface between the j-th 2 electrode High. Low-melt protective element 'can also form a metal pattern showing good wettability to molten-mongolian bodies on the insulating cover. The substrate or insulating cover is made of ceramic, glass, resin, etc ... : The surface between the electrodes is, for example, compared to two: it is the melting point rt that melts on the surface of the first and second electrodes or metal patterns. Therefore, when the abnormality occurs, the metal body m is low. The metal is pulled to the electrode, and it can be pulled to the role of the metal pattern. Guard shape, = 丨! For example, if the space for containing the low-melting-point metal body is small, the phenomenon of capillary phenomenon is shown by the combination of the two and the reverse. The shape of the molten low-dazzle metal: two quickly pull to the gap between the electrode and the metal pattern, and also fuse the low-melting metal body. 'Ear' is not limited to the surface of the substrate, the surface can also be exposed to the molten state If the surface exposed between the electrodes of the second electrode is formed to have a lower wettability than the surface of the first and second electrodes and the metal low-melting metal body, a protective film on the substrate is formed. [Embodiment] The protective element 1238429 which is applicable to the present invention is described in detail below with reference to the drawings. The first figure shows an example of the protective element applicable to the present invention (the i-th ΛH) X 'The first figure is the insulation is removed Top view of the state behind the cover. The protection element in this example is a so-called substrate-type protection element (substrate 31 and 4), a substrate i ± of the current size, and the spinning section 2 and the heating element (heater) 3 are arranged close to each other side by side; It has the effect of using a fuse to cut off the current as a fuse; the heat generating element 3 is used to generate heat when an abnormality occurs and cause the fuse portion 2 to melt. Here, as the material of the plate 1, any material having insulation properties may be used, such as a printed wiring board such as a ceramic substrate, a glass epoxy substrate, a substrate, a glass substrate, a resin substrate, and an insulated metal substrate. Bazhong ceramic substrates with excellent heat resistance and thermal conductivity are preferred. Also, as a forming material of the dazzling wire section 2 having a fuse function, various low-melting-point metals that are known as fuse materials are used. For example, Table I described in Japanese Patent Laid-Open No. 8_161_ is used. Octagonal body 5, for example, BiSnPb alloy, BiPbSn alloy, Bipb 7 ° A gold, BlSn alloy, SnPb alloy, SnAg alloy, PbIn alloy, = alloy, InSn alloy, ρ_η alloy, etc. The shape may be a sheet shape or a rod shape. Heating element 3, such as water glass, etc. | conductive materials and organic binders such as: ,,,,,,, °, mixtures, or thermosetting resins :::: Γ, fired as needed It can also be formed into……, and also can be formed by laminating and laminating these films by printing 'electric ore, steam recording, low recording, etc.]. 1238429 _ On the surface of the substrate 1, the glare wire part 2 is formed and separated from each other-pair Kun Kun 4, 5 (first and second electrodes), a pair of electrodes 6 and 7 for an 乂 and the heating element ′ The spinning section 2 or the heating element 3 is formed in such a manner as to be connected to the electrodes 4 and 5 or the electrodes 6 and 7. In addition, lead wires 8, 9, 10, and 11 are connected as external terminals at 5, 6, and 7, respectively. As far as the melting electrode of 2 persons &# ^ formed electrode, that is, the constituent materials of the electrodes 4 and 5 used in the fuse portion 2, is not particularly limited, it can be used and melted The state of the fuse part 2 has a good wettability.
就電極4、5而言，較佳係與熔融狀態的熔絲部2具有 良好沾濕性的金屬材料者’例如’可選自銅（㈤、HAs for the electrodes 4 and 5, a metal material having a good wettability with the molten fuse part 2 is preferable. For example, it may be selected from copper (㈤, H
Pt、Ag-Pd、Au、Ni、Mo所構成的群組之金屬材料中，至 少一種金屬材料者。 又，亦能以與熔融狀態的熔絲部2沾濕性不佳的材質 來構成妹4、5，並在該電#4、5表面上配置含有上述 金屬材料的金屬層。簡而言之’在本案中，在電極4、5 之表面上，可配置選自銅（Cu)、Ag、Ag_pi；、Ag_pd、Au、Among the metal materials of the group consisting of Pt, Ag-Pd, Au, Ni, Mo, there is at least one metal material. Further, the girls 4 and 5 can be made of a material having poor wettability with the fuse part 2 in a molten state, and a metal layer containing the above-mentioned metal material can be disposed on the surface of the electric # 4 and 5. In short ’, in the present case, on the surfaces of the electrodes 4, 5 can be selected from copper (Cu), Ag, Ag_pi; Ag_pd, Au,
Ni、Mo所構成的群組之金屬材料中，含有至少一種上述金 屬材料的金屬層。 就發熱體3用之電極6、7而言，雖不必考慮與熔融狀 恶的熔絲部2之沾濕性，惟由於通常係與該熔絲部2用之 電極4、5 —起形成，因此，可藉由與炼絲部2用之電極4 、5同樣的材料來形成。 就引線8、9、1 0、11而言，可使用扁平加工線或圓線 等金屬製之線材，利用焊接或熔接等來安裝於電極4、5、 1238429 :、j，藉此使該等形成電氣連接。在採用具備 -‘:之情形，引線的位置係與電極4、5、6、7呈左右二: ’藉此，在安裝作章日專 ^ 業可可以不必太考慮安裝面來作 β又’在炫絲部2上’為了防止表面氧化，可設置: 焊劑等構成的内側密封部1 了4 12。就助焊劑而言，可使用松香 糸助焊劑等、公知的助焊劑皆可用來作為 亦可為任意。 汗W /、黏度 s上述之内側密封部12，係在溶絲部2炫融之際一起炼 以’ ^與電極4、5或後述之金屬圖案心、咖接觸。在 内側在封冑12係以具有如助焊劑般的還原性之材料為主 成分的情形，即使係在電極4、5或金屬圖案…、咖的 表面形成自然氧化膜時，該氧化膜可利用内側密封部12 的：融物而還原，對熔絲部2具有高融合性的金屬材料形 成露出於電極4、5或金屬圖案15a、15b的表面。 具有如助焊劑般的還原性之材料，並未限於僅配置於 溶絲部2上的情形，在配置於電極4、5或金屬圖案心、 15b表面的情形亦包含於本案。 又二在電極4、5或金屬圖案15a、15b的表面配置如 金般之高耐腐蝕性的金屬材料，而在其表面不會有形成自 然氧化膜之虞的情形，則在熔絲部2上、以及在電極4、5 或金屬圖案15a、15b上可以不必設置内側密封部12。 以上係本實施形態之保護元件的内部構造，在本實施 形態之保護元件’如第2圖所示，可以覆蓋熔絲部2或發 熱體3的方式來設置絕緣蓋板13。絕緣蓋板13，藉由在周 1238429 圍配置樹脂1 4，以伴括g*宗門 兮“ $持无疋間^的方式固定於基板卜在 違絕緣蓋板1 3與基板1間的空門 邱9々、 4 ’則形成用來收容該熔絲 部2或發熱體3的形狀。 藉由設置該絕緣叢柘n，a L A, ^ 啄盍板13例如可抑制内側密封部j 2 : 隆起等，並可實現保護元件全體的薄型化。在此，絕緣 二13的材質’若係具有能承受熔絲部以斷的耐熱性與 機械，度之絕緣材料者皆可，例如，玻璃、^、塑膠、 破璃環氧基板般之印刷配線美纟 1刷配綠基板所使用之基板材料等各種 ，可適用°進而’亦可使用金屬板來作為絕緣蓋板13 糟由在與基板1的對向面形成樹脂或電阻等之絕緣材料 2來進行絕緣化。特別地，在使用如m般之高機械強 :材料的It形’可使絕緣蓋】3本身的厚度變薄，而非 韦有助於保護元件全體的薄型化。 將絕緣蓋板13以陶兗般導熱性優異的材料構成，透過 助焊劑來與基1側接觸’藉此，來自通常安裝接觸面( 基板^侧）以外的熱，可設置響應性佳的熔絲。在此情形 ，就來自兩面的熱檢測而言，雖較佳係使絕緣蓋板Μ與 基板1的大小相等，惟並未限於此，可使任一方小或大亦 可獲得同樣的效果。 又絕緣蓋板13可設成平板狀，或是所謂周圍豎立壁 =之蓋狀。在前者的情形，内部係空洞，而需將周圍以樹 脂密封，俾使熔融的熔絲部2擴及金屬圖案i5a、15b與電 極4、5之間；在後者的情形，例如可僅將絕緣蓋板i3接 著於基板1即可。 12 1238429 又，在絕緣蓋板13之與基板i的對向 的炼絲部2具有良好沾濕性的金屬圖案15a、i5b(第;^ 2金属圖案），此係本發明之保護元件最具特徵者。以下， 針對該金屬圖案15a、15b予以詳述。 在絕緣蓋板13之與基板】的對向面，如第3圖所示， 彼此分離的金屬圖案15a、15b係對應於熔絲部2用的電極 4、5’以與電極4、5大致相同大小形成在其大致相同位置 〇The metal material of the group consisting of Ni and Mo contains at least one metal layer of the above-mentioned metal material. Regarding the electrodes 6 and 7 for the heating element 3, although it is not necessary to consider the wettability with the melted fuse part 2, it is usually formed together with the electrodes 4, 5 for the fuse part 2, Therefore, it can be formed from the same material as the electrodes 4 and 5 for the spinning section 2. For the leads 8, 9, 10, and 11, metal wires such as flat processing wires or round wires can be used, and the electrodes 4, 5, 1238429 :, j can be mounted by welding or welding, etc. Form an electrical connection. In the case of having-':, the position of the lead is about two with the electrodes 4, 5, 6, 7, and 7:' Taking this, in the installation and installation, it is not necessary to consider the installation surface to make β again. ' In order to prevent the surface from being oxidized, the inside of the dazzling wire part 2 may be provided with an inner sealing part 1 made of solder or the like. As the flux, a rosin / rhenium flux or the like can be used, and a known flux can be used as it is, and it can be arbitrary. Sweat W /, viscosity s The above-mentioned inner sealing portion 12 is brought into contact with the electrodes 4, 5 or a metal pattern core and a coffee to be described later together when the melting wire portion 2 is melted. In the case where the seal 12 is made of a material having a reducing property such as a flux as a main component on the inside, even when a natural oxide film is formed on the surface of the electrodes 4, 5 or a metal pattern ..., the oxide film can be used. The inner sealing portion 12 is reduced by melting, and a metal material having high fusibility to the fuse portion 2 is formed to be exposed on the surfaces of the electrodes 4 and 5 or the metal patterns 15a and 15b. A material having a reducing property like a flux is not limited to the case where it is disposed only on the dissolving wire portion 2, and the case where it is disposed on the surface of the electrodes 4, 5 or the metal pattern core, 15b is also included in this case. On the other hand, electrodes 4 and 5 or metal patterns 15a and 15b are provided with a metal material having high corrosion resistance, such as gold, and there is no risk of forming a natural oxide film on the surface. It is not necessary to provide the inner sealing portion 12 on the electrodes 4 and 5 or on the metal patterns 15a and 15b. The above is the internal structure of the protective element of this embodiment. As shown in FIG. 2, the protective element of this embodiment can be provided with an insulating cover 13 so as to cover the fuse portion 2 or the heating element 3. The insulating cover plate 13 is arranged with resin 1 4 around 1238429, and is fixed to the substrate in a manner that includes g * zongmenxi "$ 持 无 疋 间 ^" The empty door between the insulating cover plate 1 3 and the substrate 1 9々, 4 ′ are formed to accommodate the fuse portion 2 or the heating element 3. By providing the insulating bundle 柘 n, a LA, ^ the pecking plate 13 can suppress, for example, the inner sealing portion j 2: bulging, etc. And the thickness of the entire protective element can be reduced. Here, the material of the insulating material 13 can be used as long as it has the heat resistance and mechanical ability to withstand the break of the fuse part. For example, glass, ^, Various types of printed wiring, such as plastic and glass-breaking epoxy substrate, can be applied to the substrate material used for the green substrate, and can be used. Furthermore, a metal plate can also be used as the insulation cover. An insulating material 2 such as a resin or a resistor is formed on the surface for insulation. In particular, when using a high mechanical strength such as m: It shape of the material can make the insulation cover 3 thinner, instead of Wei You Helps to reduce the overall thickness of the protective element. The insulating cover 13 is excellent in thermal conductivity like ceramics. Different materials are used to make contact with the base 1 side through the flux. As a result, heat from the outside of the normal mounting contact surface (substrate ^ side) can provide a responsive fuse. In this case, heat from both sides In terms of detection, although the size of the insulating cover M is preferably equal to the size of the substrate 1, it is not limited to this, and the same effect can be obtained by either small or large. The insulating cover 13 can be provided in a flat plate shape. In the former case, the inside is hollow, and the surroundings need to be sealed with resin so that the fused fuse part 2 extends to the metal patterns i5a, 15b and the electrodes 4, 5 In the latter case, for example, only the insulating cover i3 may be bonded to the substrate 1. 12 1238429 In addition, a metal having a good wettability is formed in the wire-spinning part 2 of the insulating cover 13 opposite to the substrate i. The patterns 15a, i5b (second metal pattern) are the most characteristic of the protection element of the present invention. Hereinafter, the metal patterns 15a and 15b will be described in detail. The facing of the insulating cover plate 13 and the substrate] Surface, as shown in FIG. 3, metal patterns 15a, 15b separated from each other 2 corresponds to the portion using the fuse electrodes 4,5 'to form the substantially same size as the electrodes 4 and 5 in its position substantially same square
I 即’在第1電極4上配置第1金屬圖案15a，而在第2 電極5上配置與第1金屬圖案i5a分離 脱。 刀離之第2金屬圖案 該等金屬圖案15a、15b的材f，若係相較於絕緣蓋板 13對熔絲部2具有較佳的沾濕性則未必為金屬，惟 到其機能的情形，由於若非金屬材料則不易彳 濕性，故以金屬材料較具實效。 該金屬圖案15a、15b，基於相關的觀點，可選擇使用 對炼絲部2具有良好沾濕性的金屬材料。 例如，可選自銅（Cu)、Ag、Ag_Pt、Ag_Pd、Au、Ni、 M〇所構成的群組之金屬材料中，至少一種金屬材料， 成金屬圖案15a、15b。 又’亦能於與熔融狀態的熔絲部2、沾濕性不佳的材料 所構成之金屬®案表面上配置含有上述金屬#料的金屬層 。簡而言之，在本案中，在金屬圖案15a、15bi至少表= 上，可配置選自 Cu、Ag、Ag-Pt、Ag—Pd、Au、Ni、M〇_ 13 1238429 成的群組之金屬材料中，含有至少一種上述金屬材料的金 屬層。 在本發明，於至少表面上配置上述金屬材料時，各金 屬圖案15a、15b能以相同材料構成，或是以彼此不同材料 構成亦可。 就金屬圖案15a、15b的形成方法而言，例如在絕緣蓋 板13係以陶瓷板構成的情形，可藉由印刷含該金屬材料 之導電糊，並將其燒製而成。在絕緣蓋板丨3係以塑膠等 耐熱性不佳的材料構成的情形，例如在絕緣蓋板丨3上， 利用蒸鍍或濺鍍等方法來形成金屬膜，並對其進行蝕刻來 、圖案進而，在使用金屬板（於與基板1的對向面形 成樹脂或光阻等絕緣材料層）作為絕緣蓋板13的情形，可 J用k擇性地去除該絕緣材料層（例如利用印刷等分法來 進行光阻層的圖案化），而將露出的金屬板作為金屬圖案 15a、15b 〇 / 戶a如此，在炫絲冑2炼馬虫時，對應於熔融低炼點金屬體 之基板1上的熔絲部2用之電極4、5，在絕緣蓋板 13之基板1的對向面形成具有該熔融低熔點金屬體易沾濕 :的：屬圖案15a、15b，藉此，可將保護元件設成薄型元 、’可確保在元件内部充分的熔融低熔點金屬附著面積 在门額疋電流（熔絲部2的截面積大）亦可獲 的動作特性。 〜 第4圖係表 炫點金屬之電極 示因金屬圖案15a、15b的有無之在熔融低 4、5上的流入狀態的差異。在對熔融的 1238429 熔絲部2沾濕性較佳的面僅 ^圖所示，該熔絲部2係^ / 、5的情形，如第 、5上。此時，在熔 7 /狀隆起的形狀拉到電極4 在熔田虫的熔絲部2的量 板13擠壓在基板！與絕緣蓋板13的間=，且以絕緣蓋 絲部2頂部時，c 町間隔變小而熔融的熔 “士 5上的炼絲部2合紗*上山 而會有使在電極4上的炫絲部2和在電極;=向吐出， 彼此接觸的可能性。當該等在 的熔絲部2 ，則會形成導通狀能， * 上的熔絲部2接觸 相… 無法形成炼絲部2的熔斷。 相對於此，於絕緣蓋板 情形，對炼融的炫絲部2且有屬圖案心、咖的 擴大。 具有沾濕性的面之面積可實質地 2炫=具體說明在形成金屬圖案時，熔絲部 ::過。當利用發熱體3的發熱來使 2Γ融的熔絲部2拉到沾湯性佳的電極4、5,在= …’位於電極1 2、5的部分移動至電極4、5上。 因^’在電極4、5上的料部2會僅增加 5間起的移動量的體積而陰起，故熔絲部2在電極2 I 的咼度會較熔融前為高。 上 基板1與絕緣蓋板13間的距離t，由 的熔絲部2於電極4、5上降妞蛀 °又成田熔融 上隆起時，料部2與各金屬圖案 15 1 b接觸的距離’因此’料部2會與金屬圖案j 5a 2 、广接觸，而熔融的炼絲部2則與電極4、5、以 電極4、5上的金屬圖案153、15]^接觸。 ； 由於金屬圖案15a、15b與電極4、5對熔融的熔絲部 1238429 2具有南沾濕性，ra a * 匕’在電極4、5間的熔絲部2會被進 /拉到電極4、5與位於電極4、5上的金屬圖案！ 5a、 15b之間而消失，以使熔絲部2形成二分割。如上所述， 由於電極4、5係彼此分離，且金屬圖案…、⑽亦彼此 刀離目此，當炼絲部2形成二分割時，則使電極4、5彼 此形成絕緣狀態。 …第4b圖係表不熔絲部2被拉到電極4(或電極5)與在 5亥：極4上的金屬圖案15a間的狀態。此時，形成所謂毛 :細官現象的狀態，熔融的熔絲冑2保持形成f月形 _3)的狀恷，並未自電極4、5與位於電極4、5上 的金屬圖案15間鼓出，炫融的熔絲部2側面如第化圖所 不形成凹陷狀態，而抑制其往橫方向吐出。因此，可消除 因溶融的熔絲部2 Μ T7+ + @> 轉實熔斷。 心“成的接觸，而可將熔絲部2 各金屬圖案15a、15b，在此雖係與電極4、5對向的 位置形成與對向的電極4、5相同大小，惟並未限於此。 =’就金屬圖案15a、15b的形成位置而言，較佳係形成包 “立於基板側1的電極4、5對熔融的熔絲部2之附著有效 面積的中央（熔融後的熔絲部2積存的頂點）。 > 又，藉由將金屬圖案15a、15b間的距離wi設成較 向的電極4、5間的距離，2更靠近’藉此，可提升炫絲部 W時的分割特性。但，就該距離wl而言，必須確保处 保證完全熔斷的最低限度距離（例如〇· 2咖以上）。 此 另一方面’雖將絕緣蓋板13與基板】的距離設為卜 16 1238429 惟若能確保充分的附著面積，並未作特別限定。 例如’如在電極4 屬圖案…、咖以及電?4極5:中央位置般，於無金 與基板1貼合之際=4厂？的情形’在將絕緣蓋板13 -方或兩方撓曲緣蓋板13與基板1的任 部2接觸的情形，有使絕緣盡板13與基板〗兩方與炼絲 在絕緣蓋板13盥其说〗Λ ^ 絶緣蓋板13與基板二 絲部2接觸的情形， 。 土 々距離11會成為熔絲部2厚度的1 立 在將内部密封部12設於㈣部2 α 絕緣篆柘Η命如* 1 ζ上的情形，會有使 緣盖板13與内部密封部12表面接觸的情形。 溶絲部2位於雷搞4 r Λ . 圖案15a、15b門沾 ”位在該電極卜5上的金屬 、 b1的部分，會有使金屬圖荦1 5a、1 5h 絲部2上的内部密封部12接觸的情形。= 未設置内部密封部〗？ 在熔4邛2上 15b遷入内部密 使金屬圖案…、 金屬圖宰15a、二擠a的情形，亦會有使 =1 炫絲部2直接接觸的情形。 右將電極4、5彼此的媒厚 彼此的膜犀訊Λ知從 贪屬圖案15a、15b 的金屬圖YL 15h，則在電極4、5與位在電極4、5上 成為心二二和熔絲部2接觸的狀態下，距離“系 4、，，糸。P 2厚度的1倍加 圖案1H5b的厚度之值。電極㈠的厚度以及金屬 在金屬圖案15a、15b與炼 觸的情形，於將絕緣蓋板13二2二内部密封部12接 電極4、5愈位在ς〜 _貼合之際，若使 、 4、5上的金屬圖案15a、15b間保留 17 1238429 了被拉到該間隙，故可將 充分的間隙:，則熔融的熔絲部 私絲部2纟容斷。 =此’㈣t雖未特職定，惟該距 部2厚度的12倍以上"立 罕乂住係熔絲 2厚度上“以下。若該距離t小於熔絲部 ^ ' . 口，則難保證藉熔絲部2的熔融流動所致 快速炼斷。反之，若該距離tA於料部2厚度的=之 則因距離過大而會有無法產生對金屬圖案153、服的„ 之虞’並且’亦難以實現本來目的之薄型化。 又’本實施形態的侔罐分妓 拉如 保虔70件，係亦可使金屬圖案l5a 、15b形成與引線8、9(i車桩於#+ a λα而L μ 、 八運接於對向的電極4、5)接觸的狀 態’或是使熔絲部2和絕緣蓋板13及基板j之任一方 方分離亦可。 Χ 如以上所述，在本實施形態的保護元件，由於將絕緣 蓋板13側的空間作最大限度的利用，且對熔融的熔絲部2 擴大有效的附著面積，因此，即使係高額定電流（㈣部^ 的截面積大），亦能確保該部分的熔融流入面積，並能保 證穩定的熔斷。 其次，說明適用本發明之保護元件之另一實施形態（第 2實施形態）。又，本實施形態的保護元件，其發熱體與熔 絲部並非平面配置，而係以將該等重疊的狀態配置的方式 之保護元件之例。 本實施形態的保護元件，如第5a圖至第5c圖所示， 在基板2上設置熔絲部用電極22a、22b、22c，並且在該 等電極22a、22b、22c間跨設熔絲部23(23a、23b)。又， 18 1238429 在中央的電極22c下面側’透過絕緣I μ而設置發熱體 么熱體25 ’係在從發熱體用電極26a導出的配線26χ 26y與發熱體用電極26b間被通電加熱。發熱體用電極 26b係與熔絲部用電極2託形成電氣連接。 因此虽發熱體25發熱，則位於電極22a、22c間的 熔絲部23a、以及位於電極2扎、22c間的熔絲部2儿分別 熔斷，以切斷對被保護裝置的通電，發熱體託的通電亦 被切斷：第6圖係表示以上所構成的保護元件之電路圖。 以第6圖來說明熔絲部23的熔斷過程。在Ai、A2間 連接可衝放電的充電器，在β1、B2間連接對充電器進行充 電的電源、或由充電器供應電氣之電氣機器。 例如，在B1、B2間連接電源的情形，當施加過電壓於 B卜B2 @，則齊納二極體D導通，通過電阻‘ r的電流化 供應至電晶體，而使電晶體形成〇N狀態，並使電流k通 過發熱體25a、25b。 發熱體25a、25b藉由電流ic而發熱，如上述般，由 於位於電極22a、22c間的炼絲部23a、以及位於電極咖 、22c間的熔絲部23b分別熔斷，因此，連接於αι、μ間 的充電器不會被過電壓充電。 0 在本實施形態的保護元件，亦與先前的第丨實施形離 保護元件同樣地設置絕緣蓋板27，欲圖保護元件全體= 型化，並且，在該絕緣蓋板27之與基板21對向面，如第 圊所示，對應於各熔絲部用電極22a、22b、22c，而形成 熔絲部23具有良好沾濕性的金屬圖案心、_、28c: 19 1238429 在此，金屬圖案2Sa、28b、？心知u __ Uc ’較佳係對庳於 部用電極22a、22b、22c而在3處开q也丨應於总、，.系 例如. 处形成，惟並未限於此， 例如，亦可以僅對應於中央的熔絲部用 僅形成金眉同宏％ , , _ ° 22c的形態而 观金屬圖案28c。在本貫施形離 發埶辨π „ 夕心的保4 tc件之情形， …體25係形成於該尹央的熔絲部用電極以 發熱體25發熱時，從該熔絲部用電 田 ^ 〇 电極22C上的部分之炫鲜 邛23開始熔融。因此，若藉由該 … ^ 5ψ ^ ^ 屬圖案28c的作用而將 烙融的熔絲部23拉到該部分， 對^ 則快速產生熔斷，而切斷 对被保蠖裝置的通電。 在本實施形態（第2實施形離），玄偽止义& 楚〗奋a A 仏心）亦與先前的實施形態（ 只知形幻同樣地，藉由形成金屬圖案咖、2n :擴大對熔融的熔絲部23之有效附著面積，並可保 ”且炫4部2 3之穩定炫斷。 。其次，根據實驗結果來說明適用本發明之具體實施例 (實施例） :實施例’係以先前的第i實施形態的構成為準來製 成保護元件之例。即，將且古士 將具有大小6nmx6mm、厚〇.5mm的 陶究基板作為基板，並在盆 I在其上形成電極。將Ap — pd電極加 以印刷形成以作為各電極。 又’在該等電極之中，在一對電極間印刷氧化釘系的 發熱電阻材料，並Λπ % # π ^、 力以k製而形成發熱電阻體。形成之發 熱電阻體的電組為4Ω〇7，+2 ^ ^ α 在另一對電極間炼接低炼點 金屬（寬 1 mm、厚 〇 1 、二、* & ^ 予·丨mm)而連接，並以松香系助焊劑加以密 1238429 封。又，利用烊接將Ni鍍Cu引線（寬lmm、厚〇. 5mm)連接 於各電極。 其次’將2液性環氧樹脂塗布於陶瓷基板外周後，配 置陶兗製之絕緣蓋板（大小6mmX6mm、厚0· 5mm)，持續緊壓 直到與引線接觸，並在40°C、8小時的條件下，使該環氧 樹脂硬化。 該絕緣蓋板，以與將低熔點金屬連接的電極對向的方 式形成相同尺寸的金屬圖案。金屬圖案係與電極同樣地， 將Ap〜pd電極加以印刷後燒製而成。 (比較例） 基本的保護元件之構成係與前述實施例同樣。然而， 在絕緣蓋板並未形成金屬圖案之點係與實施例不同。 (評價結果） 針對藉由以上所製成之實施例與比較例的保護元件（各 10個），將2W的電力施加於發熱電阻體，然後確認熔絲部 的熔斷情形。其結果可知，在實施例的保護元件，1〇個保 遵元件全部平均以3 0秒使熔絲部熔斷。 相對於此，在比較例的保護元件可知，即使同樣施加 W的電力’在1 G個中彳3個其熔絲部未流人電極而並未 炼斷。針對發生熔斷不良的保護元件，將其分解並觀察内 部的結果發現，㈣的料部（熔絲元件）與I緣蓋板側接 觸而形成被擠出的形狀，因而確認其為供熔斷的空間不足 由以上的說明可知 依本發明，由於在絕緣蓋板形成 21 1238429 金屬圖案’對熔融的炫絲部（低溶點金屬體）可確保充分的 附著面積’並可抑制熔絲部熔斷不良的發生。因此，可提 供在異常時可確實地將電流切斷，並具有穩定的動 之保護元件。 【圖式簡單說明】 (一） 圖式部分 第1圖係表示第1實施形態之保護元件内部構造之俯 視圖。 第2圖係表示藉由絕緣蓋板之密封狀態之概略截面圖_ 〇 苐3圖係表示絕緣蓋板之與基板對向面之俯視圖。 第4a、4b圖係表示在熔融之低熔點金屬體之電極上的 狀態之示意圖，第4a圖係表示在絕緣蓋板未形成金屬圖 案的情形，第4b圖係表示在絕緣蓋板形成金屬圖案的情 形。 第5a〜c圖係表示第2實施形態之保護元件内部構造圖 0 ，第5a圖係俯視圖，第5b圖係x-x線之截面圖，第5c圖 係y-y線之截面圖。 第6圖係表示第2實施形態之保護元件的電路構成之 電路圖。 第7圖係表示第2實施形態之絕緣蓋板之與基板對向 面之俯視圖。 (二） 元件代表符號 1、21 :基板 22 1238429 2、 23 :熔絲部 3、 25 :發熱體 4〜7 '·電極 8〜11 :引線 13、27 :絕緣蓋板 14 :樹脂 15a、15b、28a、28b、28c :金屬圖案I means, 'the first metal pattern 15a is arranged on the first electrode 4, and the second electrode 5 is arranged separately from the first metal pattern i5a. The material f of the metal patterns 15a and 15b of the second metal pattern of the blade is not necessarily metal if it has better wettability with respect to the fuse part 2 than the insulating cover plate 13, but it does not reach its function. Since non-metallic materials are not easily wetted, metallic materials are more effective. For the metal patterns 15a and 15b, a metal material having good wettability to the wire-spinning portion 2 can be selected from a related viewpoint. For example, at least one metal material may be selected from the group consisting of copper (Cu), Ag, Ag_Pt, Ag_Pd, Au, Ni, and Mo to form metal patterns 15a and 15b. It is also possible to arrange a metal layer containing the above-mentioned metal material on the surface of a metal® case made of a material having poor wettability with the fuse part 2 in a molten state. In short, in this case, at least the metal patterns 15a and 15bi can be selected from the group consisting of Cu, Ag, Ag-Pt, Ag-Pd, Au, Ni, and Mo 13-1238429. The metal material contains a metal layer of at least one of the above-mentioned metal materials. In the present invention, when the above-mentioned metal material is disposed on at least the surface, each of the metal patterns 15a and 15b may be made of the same material or may be made of different materials. As for the method of forming the metal patterns 15a and 15b, for example, when the insulating cover plate 13 is formed of a ceramic plate, a conductive paste containing the metal material can be printed and fired. In the case where the insulating cover plate 3 is made of a material with poor heat resistance such as plastic, for example, on the insulating cover plate 3, a metal film is formed by evaporation or sputtering, etc. Furthermore, when a metal plate (an insulating material layer such as a resin or a photoresist is formed on the surface opposite to the substrate 1) is used as the insulating cover plate 13, the insulating material layer can be selectively removed by k (for example, by printing or the like). Patterning the photoresist layer separately), and using the exposed metal plate as the metal pattern 15a, 15b 〇 / house a so, when the Hyun silk 胄 2 horse worms, corresponding to the substrate of the molten low-melting point metal body The electrodes 4 and 5 for the fuse part 2 on 1 are formed on the opposite side of the substrate 1 of the insulating cover 13 with the molten low melting point metal body which is easily wetted: belonging to the patterns 15a and 15b. By making the protection element thin, it is possible to ensure that sufficient melting low-melting-point metal adhesion area inside the element can be obtained even at the gate current (large cross-sectional area of the fuse portion 2). Fig. 4 is a table showing the electrode of the dazzling metal. It shows the difference in the inflow state of the low melting points 4 and 5 due to the presence or absence of the metal patterns 15a and 15b. The surface with better wettability to the fused 1238429 fuse part 2 is only shown in the figure, and the case where the fuse part 2 is ^ / 5 is as shown in Figs. At this time, the shape of the fused 7 / like bulge is pulled to the electrode 4 The amount of the plate 13 in the fuse part 2 of the worm is pressed against the substrate! The distance between the insulation cover 13 and the top of the insulation cover 2 is small, and the melting distance between c and C becomes small and melts. Hyun wire part 2 and the electrode; = the possibility of spitting out and coming into contact with each other. When the fuse part 2 is present, the conduction energy is formed, and the fuse part 2 on the * phase is in contact with ... On the other hand, in the case of an insulating cover plate, the smelting and melting wire portion 2 has an enlarged pattern core and coffee. The area of the surface with wettability can be substantially 2. In the case of a metal pattern, the fuse part is: over. When the heat of the heating element 3 is used to cause the 2Γ melted fuse part 2 to be pulled to the electrode 4 and 5 with good dipping properties, the part located at the electrode 1 2 or 5 is moved To the electrodes 4 and 5. Since the material portion 2 on the electrodes 4 and 5 only increases the volume of the movement from 5 to 5 times, the fuse portion 2 has a higher degree of melting at the electrode 2 I. The front is high. When the distance t between the upper substrate 1 and the insulating cover plate 13 is lowered by the fuse portion 2 on the electrodes 4 and 5, and when Narita melts and rises, the material portion 2 and each metal figure 15 1 b contact distance 'so' the material part 2 will be in wide contact with the metal pattern j 5a 2, and the molten spinning part 2 is in contact with the electrodes 4 and 5 and the metal patterns 153 and 15 on the electrodes 4 and 5] ^ Contact .; Because the metal patterns 15a, 15b and the electrodes 4, 5 pairs of molten fuse parts 1238429 2 are wettable to the south, ra a * d 'fuse part 2 between the electrodes 4, 5 will be pulled in / drawn To the electrodes 4, 5 and the metal patterns located on the electrodes 4, 5! And 5a, 15b disappear, so that the fuse part 2 is divided into two. As described above, since the electrodes 4, 5 are separated from each other, and the metal pattern …, ⑽ also cut away from each other, when the wire-making section 2 is divided into two, the electrodes 4 and 5 are insulated from each other.… FIG. 4b shows that the fuse section 2 is pulled to the electrode 4 (or electrode) 5) The state between the metal pattern 15a on the pole 5: pole 4. At this time, the state of the so-called hair: fine official phenomenon is formed, and the molten fuse 胄 2 remains in the shape of f_3), and It does not bulge between the electrodes 4, 5 and the metal pattern 15 on the electrodes 4, 5, and the side of the fused fuse part 2 does not form a recessed state as shown in the first figure, and it is inhibited from moving horizontally. It can be ejected in the direction. Therefore, the melted fuse part 2 Μ T7 + + @ > can be eliminated. The contact made by the heart can make the metal patterns 15 a and 15 b of the fuse part 2. The opposing positions of 4, 5 are the same size as the opposing electrodes 4, 5 but they are not limited to this. = 'It is preferable to form the center of the effective area of the adhesion of the electrodes 4 and 5 on the substrate side 1 to the fused fuse portion 2 (the fused portion after the fusion) 2 accumulated vertices). Also, by setting the distance wi between the metal patterns 15a and 15b to the distance between the facing electrodes 4, 5 and 2 closer to 'thereby, the dazzling wire portion W can be improved. Segmentation characteristics. However, in terms of the distance wl, it is necessary to ensure a minimum distance (for example, 0.2 or more) to ensure complete fusing. On the other hand, although the distance between the insulating cover plate 13 and the substrate is set to Bu 16 1238429 There is no special limitation as long as a sufficient adhesion area can be ensured. For example, 'if the electrode 4 is a pattern ..., coffee, and electrode 4: 5 center position, when no gold is attached to the substrate 1 = In the case of 4 plants? In the case where the insulating cover plate 13-square or both sides of the deflection edge cover plate 13 is in contact with any part 2 of the substrate 1, there are two sides of the insulating cover plate 13 and the substrate. The cover plate 13 is easy to say. Λ ^ In the case where the insulating cover plate 13 is in contact with the second wire portion 2 of the substrate, the soil distance 11 will be When the thickness of the fuse part 2 is 1 and the internal sealing part 12 is provided on the cymbal 2 α insulation life such as * 1 ζ, the edge cover 13 may be in contact with the surface of the internal sealing part 12 The wire-dissolving part 2 is located in the part 4 r Λ. The patterns 15a and 15b are covered with the metal and b1 on the electrode 5 and there will be metal parts 荦 1a and 15h on the wire part 2. When the sealing portion 12 is in contact. = No internal seal is provided? In the case of melting 4 邛 2, 15b is moved into the inner dense metal pattern ..., the metal figure 15a, and the second squeeze a, there may be a case where the = 1 dazzling wire part 2 is in direct contact. On the right, the thicknesses of the electrodes 4 and 5 are thickened with each other. From the metal pattern YL 15h of the greedy patterns 15a and 15b, the electrodes 4 and 5 and the electrodes 4 and 5 become the heart two and two. In the state where the wire part 2 is in contact, the distance is "4 ,,,, 糸. The value of P 2 is 1 times the thickness of the pattern 1H5b. The thickness of the electrode 以及 and the metal in the metal patterns 15a, 15b and the touch, so Insulating cover plate 13 22 22 Internal sealing portion 12 is connected to electrodes 4 and 5 at a time of ς ~ _. At the time of bonding, if the metal patterns 15a and 15b on 4 and 5 remain 17 1238429, it is pulled to the gap. Therefore, a sufficient gap can be made: the melting fuse part of the private wire part 2 is tolerated. = This' ㈣t has not been specially appointed, but the thickness of the distance part 2 is more than 12 times " The thickness of fuse 2 is "less than". If the distance t is smaller than the opening of the fuse portion ^ '., It is difficult to ensure rapid smelting due to the melt flow of the fuse portion 2. Conversely, if the distance tA is equal to or greater than the thickness of the material portion 2, there is a risk that the metal pattern 153 and the clothes cannot be produced because the distance is too large, and it is also difficult to reduce the thickness of the original purpose. Also, this embodiment The tin can is divided into 70 pieces, such as piety, and the metal patterns 15a and 15b can also be formed with the leads 8, 9 (i car pile at # + a λα and L μ, and y is connected to the opposite electrode 4, 5) The state of contact 'or the fuse part 2 and either of the insulation cover 13 and the substrate j may be separated. X As described above, in the protection element of this embodiment, the insulation cover 13 side The space is used to the maximum, and the effective adhesion area is enlarged for the fused fuse part 2. Therefore, even if the rated current is high (the cross-sectional area of the crotch part ^ is large), the molten inflow area of the part can be ensured, and Stable fusing can be ensured. Next, another embodiment (second embodiment) of the protection element to which the present invention is applied will be described. In addition, in the protection element of this embodiment, the heating element and the fuse portion are not arranged on a plane, but are based on Ways to configure these overlapping states An example of a protective element. As shown in FIGS. 5a to 5c, the protective element of this embodiment is provided with electrodes 22a, 22b, and 22c for a fuse portion on the substrate 2, and between these electrodes 22a, 22b, and 22c. A fuse portion 23 is provided across (23a, 23b). Also, 18 1238429 is provided on the lower side of the central electrode 22c 'through the insulation I μ and the heating element 25' is connected to the wiring 26χ 26y derived from the heating element electrode 26a. It is electrically heated with the heating element electrode 26b. The heating element electrode 26b is electrically connected to the fuse portion electrode 2 holder. Therefore, although the heating element 25 generates heat, the fuse portion 23a between the electrodes 22a and 22c, and The fuse part 2 located between the electrodes 2 and 22c is blown to cut off the energization to the protected device, and the energization of the heating body holder is also cut off: Fig. 6 is a circuit diagram showing the protection element constituted above. The fuse process of the fuse section 23 will be described with reference to Fig. 6. A chargeable discharge charger is connected between Ai and A2, a power source for charging the charger is connected between β1 and B2, or an electric device that supplies electric power from the charger. For example, when power is connected between B1 and B2 When an overvoltage is applied to B, B2 @, the Zener diode D is turned on, and is supplied to the transistor through the currentization of the resistor 'r, so that the transistor forms an ON state, and the current k passes through the heating element 25a, 25b. The heating elements 25a and 25b generate heat by the current ic. As described above, since the wire-refining portion 23a located between the electrodes 22a and 22c and the fuse portion 23b located between the electrodes 22a and 22c are respectively blown, they are connected to The charger between α and μ will not be charged by overvoltage. 0 The protective element in this embodiment is also provided with an insulating cover 27 in the same manner as the previous embodiment. The protection element is intended to protect the entire element = type In addition, as shown in (i), the surface of the insulating cover plate 27 facing the substrate 21 corresponds to the electrodes 22a, 22b, and 22c for the fuse portions, and a metal having a good wettability is formed in the fuse portions 23 Pattern heart, _, 28c: 19 1238429 Here, the metal pattern 2Sa, 28b,? Knowing u __ Uc 'preferably to the electrode 22a, 22b, 22c for the internal use, and open q at three places should also be formed at, such as, but not limited to this, for example, you can also Corresponding to the central fuse part, the metal pattern 28c is formed only in the form of gold eyebrows with the same macro%,, 22 °. In the case of the inductive separation of the hairpin, „Xi Xin's 4 tc pieces,… the body 25 is formed by the fuse part electrode of Yin Yang and the heating part 25 is used to generate electricity from the fuse part. The part of the fresh 邛 23 on the electrode 22C of the field ^ 〇 starts to melt. Therefore, if the fused part 23c is pulled to the part by the action of the ^ 5ψ ^ ^ metal pattern 28c, ^ then The fuse is quickly generated, and the power to the protected device is cut off. In this embodiment (second embodiment), the mystery of the hypocrisy & Chu〗 a a heart is also the same as the previous embodiment (only known shape Similarly, by forming the metal pattern coffee, 2n: to expand the effective adhesion area to the fused fuse portion 23, and to ensure the stable and transparent break of the 4 and 23 parts. Second, the application is explained based on the experimental results. A specific embodiment (Example) of the present invention: The embodiment is an example in which the protection element is made based on the structure of the previous i-th embodiment. That is, the ancients will have a size of 6nmx6mm and a thickness of 0.5mm. A ceramic substrate is used as a substrate, and electrodes are formed on the basin I. Ap — pd electrodes are printed The electrodes are used as the electrodes. Among these electrodes, an oxide nail-based heating resistor material is printed between a pair of electrodes, and Λπ% # π ^ is used to form a heating resistor body. The formed heating resistor The body's electrical group is 4Ω〇7, +2 ^ ^ α Smelting a low-melting point metal (width 1 mm, thickness 〇1, two, * & ^ · mm) between another pair of electrodes, and connected, and A rosin-based flux was used to seal 1238429. In addition, a Ni-plated Cu lead (1 mm wide and 0.5 mm thick) was connected to each electrode by bonding. Next, after applying a two-liquid epoxy resin to the outer periphery of the ceramic substrate, Configure an insulation cover made of ceramics (size 6mmX6mm, thickness 0.5mm), keep pressing until it comes into contact with the lead, and harden the epoxy resin at 40 ° C for 8 hours. The insulation cover, A metal pattern of the same size is formed so as to face an electrode connected to a low-melting-point metal. The metal pattern is formed by printing and firing Ap ~ pd electrodes in the same manner as the electrode. (Comparative example) Basic protection element The structure is the same as the previous embodiment. However, the insulating cover is not shaped The point of forming a metal pattern is different from that of the example. (Evaluation result) For the protection elements (10 each) of the examples and comparative examples prepared as described above, 2 W of power was applied to the heating resistor, and the fusion resistance was confirmed. The fuse part of the wire part. As a result, it can be seen that in the protective element of the embodiment, all 10 compliance elements blow the fuse part on average in 30 seconds. In contrast, the protective element of the comparative example shows that even if the same is applied The power of W is 3 out of 1 G, and its fuse part has not flowed into the electrode and has not been broken. For the protection element that has a poor fuse, it was decomposed and the internal results were observed. The wire element) comes into contact with the edge of the cover plate to form an extruded shape. Therefore, it is confirmed that there is insufficient space for fusing. From the above description, it can be known that according to the present invention, since a metal pattern 21 1238429 is formed on the insulating cover plate, The dazzling wire section (low melting point metal body) can ensure a sufficient adhesion area ', and can suppress the occurrence of poor melting of the fuse section. Therefore, it is possible to provide a protection element that can reliably cut off the current in the event of an abnormality and has stable movement. [Brief description of the drawings] (I) Schematic part The first figure is a plan view showing the internal structure of the protective element of the first embodiment. Figure 2 is a schematic cross-sectional view showing the sealed state by the insulating cover _ 〇 3 is a plan view showing the surface of the insulating cover facing the substrate. Figures 4a and 4b are schematic diagrams showing a state on an electrode of a molten low-melting-point metal body. Figure 4a is a case where a metal pattern is not formed on an insulating cover plate, and Figure 4b is a metal pattern is formed on an insulating cover plate. Situation. Figures 5a to c are internal structure diagrams 0 of the protective element of the second embodiment, Figure 5a is a top view, Figure 5b is a cross-sectional view taken along line x-x, and Figure 5c is a cross-sectional view taken along line y-y. Fig. 6 is a circuit diagram showing a circuit configuration of a protection element according to a second embodiment. Fig. 7 is a plan view showing an insulating cover plate of the second embodiment facing the substrate. (II) Symbols for component 1, 21: Substrate 22 1238429 2, 23: Fuse section 3, 25: Heating element 4 ~ 7 '· Electrode 8 ~ 11: Leads 13, 27: Insulating cover 14: Resin 15a, 15b , 28a, 28b, 28c: metal pattern
23twenty three