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JP4348385B2 - Surface-mount current fuse - Google Patents

Surface-mount current fuse Download PDF

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Publication number
JP4348385B2
JP4348385B2 JP2007244431A JP2007244431A JP4348385B2 JP 4348385 B2 JP4348385 B2 JP 4348385B2 JP 2007244431 A JP2007244431 A JP 2007244431A JP 2007244431 A JP2007244431 A JP 2007244431A JP 4348385 B2 JP4348385 B2 JP 4348385B2
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pair
case
metal terminals
fuse
straight
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JP2009076330A (en
Inventor
史啓 中路
在盛 李
亘 石井
輝美 嶋野
一晃 加羽澤
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日本製線株式会社
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Priority to JP2007244431A priority Critical patent/JP4348385B2/en
Priority to EP08164573.1A priority patent/EP2040281B1/en
Priority to KR1020080092012A priority patent/KR101017119B1/en
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H85/00—Protective devices in which the current flows through a part of fusible material and this current is interrupted by displacement of the fusible material when this current becomes excessive
    • H01H85/02—Details
    • H01H85/04—Fuses, i.e. expendable parts of the protective device, e.g. cartridges
    • H01H85/041—Fuses, i.e. expendable parts of the protective device, e.g. cartridges characterised by the type
    • H01H85/0411—Miniature fuses
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H85/00—Protective devices in which the current flows through a part of fusible material and this current is interrupted by displacement of the fusible material when this current becomes excessive
    • H01H85/02—Details
    • H01H85/04—Fuses, i.e. expendable parts of the protective device, e.g. cartridges
    • H01H85/041—Fuses, i.e. expendable parts of the protective device, e.g. cartridges characterised by the type
    • H01H85/0411—Miniature fuses
    • H01H2085/0412—Miniature fuses specially adapted for being mounted on a printed circuit board
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H85/00—Protective devices in which the current flows through a part of fusible material and this current is interrupted by displacement of the fusible material when this current becomes excessive
    • H01H85/02—Details
    • H01H85/04—Fuses, i.e. expendable parts of the protective device, e.g. cartridges
    • H01H85/041—Fuses, i.e. expendable parts of the protective device, e.g. cartridges characterised by the type
    • H01H85/0411—Miniature fuses
    • H01H2085/0414—Surface mounted fuses
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H2239/00—Miscellaneous
    • H01H2239/032—Anti-tamper

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  • Fuses (AREA)

Description

本発明は、プリント基板に表面実装される表面実装型電流ヒューズに関する。   The present invention relates to a surface-mount current fuse that is surface-mounted on a printed circuit board.

電子機器の小型化、高密度化に伴い、プリント基板に表面実装される表面実装型電流ヒューズにも小型化、高密度化が要求されている。この種の従来の表面実装型電流ヒューズとして、例えば、特許文献１に開示されているものが知られている。このヒューズは、可溶線（ヒューズ線）を挟持した１対の金属電極が箱型本体に両端を取り付けられ、蓋部を本体の上面より僅かに沈む位置まで押し込み、接着剤を塗布して蓋部を本体に接着固定して内部を密封し、可溶線は本体の内部空間に浮いた状態で架張されている。   As electronic devices are miniaturized and densified, surface-mount current fuses that are surface-mounted on printed circuit boards are also required to be miniaturized and densified. As this type of conventional surface mount type current fuse, for example, one disclosed in Patent Document 1 is known. This fuse has a pair of metal electrodes sandwiching a fusible wire (fuse wire) attached at both ends to the box-type main body, pushes the lid part to a position where it sinks slightly from the upper surface of the main body, and applies adhesive to the lid Is adhered and fixed to the main body to seal the inside, and the fusible wire is stretched in a floating state in the internal space of the main body.

このような構成のヒューズは、遮断時のガス圧、排気ガスの処理、端子の固定等を考慮して、蓋部の固定に接着剤を使用しているので、自動機械による製造、コスト面から難点がある。また、可溶線は本体の内部空間に浮いた状態で架張されているので、振動や衝撃などの影響を受け易く、信頼性の低下をまねく。
特開平９−６３４５５号公報 The fuse with such a configuration uses an adhesive to fix the lid in consideration of gas pressure at shutdown, exhaust gas treatment, terminal fixing, etc. There are difficulties. Moreover, since the fusible wire is stretched in a floating state in the internal space of the main body, it is easily affected by vibrations and impacts, resulting in a decrease in reliability.
JP-A-9-63455

本発明は上記のような事情を考慮してなされたものであり、その目的は、自動機械による製造が可能であり、かつ製造コストの低減を図ることができ、さらに振動や衝撃などの影響が少なく信頼性の高い表面実装型電流ヒューズを提供することである。   The present invention has been made in consideration of the above-described circumstances, and its purpose is that it can be manufactured by an automatic machine, can reduce the manufacturing cost, and is further influenced by vibration and impact. It is to provide a surface mount type current fuse that is small and highly reliable.

第１の発明の表面実装型電流ヒューズは、それぞれ略直方体の箱型形状を有する一対の絶縁ケース部材を溶融接合して構成されると共に、底部に一対の端子挿入孔が設けられたケースと、ループ状の頂部、この頂部から同一方向に伸びる一対の第１の直線部、及び一対の第１の直線部の各終端で略直角に折り曲げられてそれぞれ反対方向に伸びる一対の第２の直線部を有する一対の金属端子と、束ねた棒状のガラス繊維材にヒューズ線が螺旋状に所定のピッチで巻回されているヒューズエレメントアセンブリを具備し、前記一対の金属端子の各頂部は前記ケースの内部に位置し、前記ヒューズエレメントアセンブリの両端部は前記一対の金属端子の各頂部の内側に挿入されて保持され、かつ前記ヒューズ線が各頂部で前記一対の金属端子に電気的に接合されており、前記一対の金属端子の一対の第１の直線部は前記ケースの底部に設けられた一対の端子挿入孔を貫通して前記一対の第２の直線部が前記ケース外部に露出し、第２の直線部は前記ケースの底部に沿うように位置して電極端子を構成し、前記一対の絶縁ケース部材は、前記ケース内部の互いに対向する位置に、前記一対の金属端子の前記ループ状の頂部を保持する絶縁ケース部材と一体で成型された一対の壁部を有することを特徴とする。 The surface mount type current fuse of the first invention is formed by melting and bonding a pair of insulating case members each having a substantially rectangular parallelepiped box shape, and a case provided with a pair of terminal insertion holes at the bottom, A loop-shaped top portion, a pair of first straight portions extending from the top in the same direction, and a pair of second straight portions that are bent at substantially right angles at respective ends of the pair of first straight portions and extend in opposite directions. And a fuse element assembly in which fuse wires are spirally wound around a bundle of rod-like glass fiber materials at a predetermined pitch, and each top portion of the pair of metal terminals The fuse element assembly has both ends inserted and held inside the tops of the pair of metal terminals, and the fuse wire is electrically connected to the pair of metal terminals at each top. The pair of first straight portions of the pair of metal terminals penetrates a pair of terminal insertion holes provided in the bottom of the case, and the pair of second straight portions are outside the case. And the second linear portion is positioned along the bottom of the case to constitute an electrode terminal, and the pair of insulating case members are arranged at positions facing each other inside the case. It has a pair of wall part integrally molded with the insulating case member holding the loop-shaped top part .

第２の発明の表面実装型電流ヒューズは、それぞれ略直方体の箱型形状を有する一対の絶縁ケース部材を溶融接合して構成されると共に、底部に一対の端子挿入孔が設けられたケースと、ループ状の頂部、この頂部から伸びる第１の直線部、及び第１の直線部の終端で略直角に折り曲げられた第２の直線部を有する一対の金属端子と、束ねた棒状のガラス繊維材にヒューズ線が螺旋状に所定のピッチで巻回されているヒューズエレメントアセンブリを具備し、前記一対の金属端子の各頂部は前記ケースの内部に位置し、前記ヒューズエレメントアセンブリの両端部は前記一対の金属端子の各頂部の内側に挿入されて保持され、かつ前記ヒューズ線が各頂部で前記一対の金属端子に電気的に接合されており、前記一対の金属端子の各第１の直線部は前記ケースの底部に設けられた一対の端子挿入孔を貫通して前記各第２の直線部が前記ケース外部に露出し、第２の直線部は前記ケースの底部に沿うように位置して電極端子を構成し、前記一対の絶縁ケース部材は、前記ケース内部の互いに対向する位置に、前記一対の金属端子の前記ループ状の頂部を保持する絶縁ケース部材と一体で成型された一対の壁部を有することを特徴とする。 The surface mount type current fuse of the second invention is configured by melting and bonding a pair of insulating case members each having a substantially rectangular parallelepiped box shape, and a case provided with a pair of terminal insertion holes at the bottom, A pair of metal terminals having a loop-shaped top portion, a first straight portion extending from the top portion, and a second straight portion bent substantially at the end of the first straight portion, and a bundle of rod-like glass fiber materials A fuse element assembly in which a fuse wire is spirally wound at a predetermined pitch, each top portion of the pair of metal terminals is located inside the case, and both end portions of the fuse element assembly are the pair. The metal wires are inserted and held inside the tops of the metal terminals, and the fuse wires are electrically joined to the pair of metal terminals at the tops, and the first straight lines of the pair of metal terminals The second straight portions are exposed to the outside of the case through a pair of terminal insertion holes provided in the bottom portion of the case, and the second straight portions are located along the bottom portion of the case. The pair of insulating case members that constitute the electrode terminals are formed integrally with an insulating case member that holds the loop-shaped top portions of the pair of metal terminals at positions facing each other inside the case. It has the part .

また、第１、第２の発明の表面実装型電流ヒューズにおいて、前記一対の絶縁ケース部材は、前記ケース内部の互いに対向する位置に、前記ヒューズエレメントアセンブリを保持する絶縁ケース部材と一体で成型された一対の壁部を有することを特徴とする。   In the surface-mounted current fuse of the first and second inventions, the pair of insulating case members are integrally formed with the insulating case member holding the fuse element assembly at positions facing each other inside the case. A pair of wall portions.

さらに、第１、第２の発明の表面実装型電流ヒューズにおいて、前記ケースの底部及び側面にはそれぞれ、前記ヒューズ線の遮断時のガス圧を低減する排気孔が設けられていることを特徴とする。   Further, in the surface mount type current fuse of the first and second inventions, the bottom and side surfaces of the case are each provided with an exhaust hole for reducing a gas pressure when the fuse wire is cut off. To do.

さらに、第２の発明の表面実装型電流ヒューズにおいて、前記一対の金属端子の前記各第２の直線部は、前記各第１の直線部の終端で略直角に折り曲げられてそれぞれ反対方向に伸びていることを特徴とする。   Further, in the surface mount type current fuse of the second invention, each of the second straight portions of the pair of metal terminals is bent at a substantially right angle at the end of each of the first straight portions and extends in the opposite direction. It is characterized by.

さらに、第２の発明の表面実装型電流ヒューズにおいて、前記一対の金属端子の前記各第２の直線部は、前記各第１の直線部の終端で略直角に折り曲げられてそれぞれ同一方向に伸びていることを特徴とする。   Further, in the surface mount type current fuse of the second invention, each of the second straight portions of the pair of metal terminals is bent at a substantially right angle at the end of each of the first straight portions and extends in the same direction. It is characterized by.

本発明によれば、自動機械による製造が可能であり、かつ製造コストの低減を図ることができ、さらに振動や衝撃などの影響が少なく信頼性の高い表面実装型電流ヒューズを提供することができる。   According to the present invention, it is possible to provide a highly reliable surface-mount current fuse that can be manufactured by an automatic machine, can reduce manufacturing costs, and is less affected by vibration and impact. .

（第１の実施形態）
以下、図面を参照して本発明を実施の形態により説明する。 (First embodiment)
Hereinafter, the present invention will be described with reference to the drawings.

図１は、本発明の第１の実施の形態に係る表面実装型電流ヒューズの全体の構成を示しており、図１（ａ）は一部を破断して示す正面図、図１（ｂ）は図１（ａ）のＡ−Ａ´線に沿った断面図、図１（ｃ）は下面図である。本実施形態の表面実装型電流ヒューズは、ケース１０、一対の金属端子３０、及びヒューズエレメントアセンブリ４０を有する。   FIG. 1 shows the overall structure of a surface-mount current fuse according to a first embodiment of the present invention. FIG. 1 (a) is a partially cutaway front view, and FIG. 1 (b). FIG. 1A is a cross-sectional view taken along line AA ′ in FIG. 1A, and FIG. 1C is a bottom view. The surface mount type current fuse of this embodiment includes a case 10, a pair of metal terminals 30, and a fuse element assembly 40.

ケース１０は、それぞれ略直方体の箱型形状を有するモールド成型体からなる一対の絶縁ケース部材１１ａ、１１ｂの開放端面同士を溶融接合して構成されている。図２は、一対の絶縁ケース部材１１ａ、１１ｂの一方のみを示す斜視図である。一対の絶縁ケース部材１１ａ、１１ｂを接合した際に、図１（ｃ）に示すように、ケース１０の底部に一対の端子挿入孔１２、１３が形成されるように、一対の絶縁ケース部材１１ａ、１１ｂの底部の対応する位置には、端子挿入孔用の窪み１２ａ、１３ａが形成されている。さらに、一対の絶縁ケース部材１１ａ、１１ｂを接合した際に、図１（ｃ）に示すように、ケース１０の底部に端子挿入孔１２、１３よりも小径の一対の排気孔１４、１５が形成されるように、一対の絶縁ケース部材１１ａ、１１ｂの底部の対応する位置には、排気孔用の窪み１４ａ、１５ａが形成されている。   The case 10 is configured by melting and bonding the open end surfaces of a pair of insulating case members 11a and 11b each formed of a molded body having a substantially rectangular parallelepiped box shape. FIG. 2 is a perspective view showing only one of the pair of insulating case members 11a and 11b. When the pair of insulating case members 11a and 11b are joined, the pair of insulating case members 11a are formed so that the pair of terminal insertion holes 12 and 13 are formed at the bottom of the case 10 as shown in FIG. , 11b, recesses 12a and 13a for terminal insertion holes are formed at corresponding positions on the bottom. Further, when the pair of insulating case members 11a and 11b are joined, as shown in FIG. 1C, a pair of exhaust holes 14 and 15 having a smaller diameter than the terminal insertion holes 12 and 13 are formed at the bottom of the case 10. As described above, recesses 14a and 15a for exhaust holes are formed at corresponding positions on the bottoms of the pair of insulating case members 11a and 11b.

また、一対の絶縁ケース部材１１ａ、１１ｂ内部の互いに対向する位置には、図２の斜視図に示すように、ヒューズエレメントアセンブリ４０を保持するための、絶縁ケース部材と一体で成型された一対の壁部１７ａ、１８ａがそれぞれ形成されている。さらに、図２の斜視図に示すように、一対の絶縁ケース部材１１ａ、１１ｂを接合した際に、ケース１０の一対の側面に排気孔１９、２０が形成されるように、排気孔用の窪み１９ａ、２０ａが形成されている。この窪み１９ａ、２０ａのサイズは窪み１４ａ、１５ａとほぼ同様である。排気孔１９、２０が形成されるケース１０の側面は、図１（ａ）に示すように、ヒューズエレメントアセンブリ４０の両端部端面と対向する側面である。 Further, as shown in the perspective view of FIG. 2, a pair of insulating case members 11a and 11b are formed integrally with the insulating case member for holding the fuse element assembly 40 at positions facing each other. Wall portions 1 7 a and 1 8 a are respectively formed. Furthermore, as shown in the perspective view of FIG. 2, when the pair of insulating case members 11a and 11b are joined, the exhaust hole recesses are formed so that the exhaust holes 19 and 20 are formed on the pair of side surfaces of the case 10. 19a and 20a are formed. The sizes of the recesses 19a and 20a are substantially the same as the recesses 14a and 15a. The side surface of the case 10 in which the exhaust holes 19 and 20 are formed is a side surface that faces the end surfaces of both ends of the fuse element assembly 40 as shown in FIG.

一対の金属端子３０のそれぞれは、金属板もしくは丸型線材（本例では金属板）を折り曲げ加工して形成されており、図１（ｂ）に示すように、ループ状の頂部３１、この頂部３１から同一方向に伸びる一対の第１の直線部３２ａ、３２ｂ、一対の第１の直線部３２ａ、３２ｂの各終端で略直角に折り曲げられてそれぞれ反対方向に伸びる一対の第２の直線部３３ａ、３３ｂ、及び一対の第２の直線部３３ａ、３３ｂの各終端で略直角に折り曲げられて頂部３１の方向に伸びる一対の第３の直線部３４ａ、３４ｂをそれぞれ有する。すなわち、一対の金属端子３０は、略「Ω」状の形状を有する。   Each of the pair of metal terminals 30 is formed by bending a metal plate or a round wire (in this example, a metal plate), and as shown in FIG. A pair of first linear portions 32a and 32b extending in the same direction from 31 and a pair of second linear portions 33a that are bent at substantially right angles at the respective ends of the pair of first linear portions 32a and 32b and extend in opposite directions. , 33b, and a pair of third straight portions 34a, 34b that extend in the direction of the top portion 31 by being bent at substantially right angles at the respective ends of the pair of second straight portions 33a, 33b. That is, the pair of metal terminals 30 have a substantially “Ω” shape.

図１（ａ）に示すように、ヒューズエレメントアセンブリ４０は、束ねた棒状のガラス繊維束４１にヒューズ線４２が螺旋状に所定のピッチで巻回されている。ヒューズエレメントアセンブリ４０は、定格電流よりも大きな電流（過電流、回路故障などにより発生する異常電流）が流れた際に発生するジュール熱によりヒューズ線４２が発熱し、所定の時間で溶断することが本来の役割である。従って、ヒューズ線４２は、定格電流によって線径や時には材質などが異なり、それぞれの特性を満足するように設計し設定される。   As shown in FIG. 1A, in the fuse element assembly 40, fuse wires 42 are spirally wound around a bundle of rod-shaped glass fiber bundles 41 at a predetermined pitch. In the fuse element assembly 40, the fuse wire 42 generates heat due to Joule heat generated when a current larger than the rated current (an abnormal current generated due to an overcurrent, a circuit failure, etc.) flows, and the fuse element assembly 40 may be blown out in a predetermined time. It is the original role. Therefore, the fuse wire 42 is designed and set so as to satisfy the respective characteristics because the wire diameter and sometimes the material differ depending on the rated current.

ヒューズエレメントアセンブリ４０は、両端部が一対の金属端子３０の各頂部３１の内側に挿入されて保持されるように組み立てられており、かつヒューズ線４２は各頂部３１で一対の金属端子３０に対してスポット溶接または半田付け等の手段によって電気的に接合されている。   The fuse element assembly 40 is assembled so that both end portions are inserted and held inside the top portions 31 of the pair of metal terminals 30, and the fuse wire 42 is connected to the pair of metal terminals 30 at the top portions 31. They are electrically joined by means such as spot welding or soldering.

そして、ヒューズエレメントアセンブリ４０が組み立てられた状態で一対の金属端子３０の各頂部３１がケース１０の内部に位置するように、一対の金属端子３０の一対の第１の直線部３２ａ、３２ｂがケース１０の底部の一対の端子挿入孔１２、１３を貫通するように挿入されている。   Then, the pair of first straight portions 32a and 32b of the pair of metal terminals 30 is the case so that the top portions 31 of the pair of metal terminals 30 are located inside the case 10 in a state where the fuse element assembly 40 is assembled. 10 is inserted through the pair of terminal insertion holes 12 and 13 at the bottom.

図１（ｂ）に示すように、一対の金属端子３０の一対の第２の直線部３３ａ、３３ｂ及び第３の直線部３４ａ、３４ｂはケース外部に露出した状態となり、第２の直線部３３ａ、３３ｂはケース１０の底部に沿うように位置して、プリント基板に半田付けにより接合する際に使用される電極端子を構成し、第３の直線部３４ａ、３４ｂはケース側面の外形に沿うように位置してケースを両側から挟持する。第３の直線部３４ａ、３４ｂが製品の外形面から突出しないようにするために、図１に示すように、一対の絶縁ケース部材１１ａ、１１ｂに凹状部２１が形成されている。第３の直線部３４ａ、３４ｂは、さらに、プリント基板に接合した後の導通を確認するためのテスト端子としても使用できる。   As shown in FIG. 1B, the pair of second straight portions 33a and 33b and the third straight portions 34a and 34b of the pair of metal terminals 30 are exposed to the outside of the case, and the second straight portions 33a. , 33b are positioned along the bottom of the case 10 to form electrode terminals used for joining to the printed circuit board by soldering, and the third straight portions 34a, 34b are along the outer shape of the case side surface. Hold the case from both sides. In order to prevent the third straight portions 34a, 34b from protruding from the outer surface of the product, as shown in FIG. 1, the concave portions 21 are formed in the pair of insulating case members 11a, 11b. The third straight portions 34a and 34b can also be used as test terminals for confirming continuity after bonding to the printed circuit board.

また、一対の絶縁ケース部材１１ａ、１１ｂ内部の互いに対向する位置には、ヒューズエレメントアセンブリ４０を保持するための、絶縁ケース部材と一体で成型された一対の壁部１７ａ、１８ａが設けられている。この一対の壁部１７ａ、１８ａは、ヒューズエレメントアセンブリ４０と当接する部分が、アセンブリ４０の外形に合わせてほぼ半円状にくり抜かれており、製造時にヒューズエレメントアセンブリ４０が曲がらないようにするためのガイドの役目を果たすと共に、製造後に振動や衝撃などがヒューズエレメントアセンブリ４０に加わらないようにして信頼性を向上させる役目を果たす。さらに、一対の壁部１７ａ、１８ａは、遮断時に発生するアークガスの飛散に対してブロックする役割を有する。一般に大きな電流（短絡電流）が流れた場合、ヒューズエレメントアセンブリ４０の急激な温度上昇を伴い、ヒューズエレメントアセンブリ４０の温度上昇の一番高くなる略中央部で溶断する。この際に発生するアークガスが金属蒸気を含んでいるために、遮断後の絶縁劣化を生じ易くなる。本実施形態の表面実装型電流ヒューズのように、小型で容積の小さな製品においては、対策しなければならない重要な技術課題である。一対の壁部１７ａ、１８ａは、アークガスの飛散方向に対して影となる部分が有効に作用し、遮断後の絶縁劣化を抑制する。   In addition, a pair of wall portions 17a and 18a formed integrally with the insulating case member for holding the fuse element assembly 40 are provided at positions facing each other inside the pair of insulating case members 11a and 11b. . The pair of wall portions 17a and 18a have portions that abut against the fuse element assembly 40 cut out in a semicircular shape to match the outer shape of the assembly 40, so that the fuse element assembly 40 does not bend during manufacture. In addition to serving as a guide for the above, it also serves to improve reliability by preventing vibration and shock from being applied to the fuse element assembly 40 after manufacture. Further, the pair of wall portions 17a and 18a has a role of blocking arc gas scattering generated at the time of interruption. In general, when a large current (short-circuit current) flows, the fuse element assembly 40 is melted at a substantially central portion where the temperature rise of the fuse element assembly 40 is highest with a rapid temperature rise. Since the arc gas generated at this time contains metal vapor, the insulation deterioration after the interruption is likely to occur. This is an important technical problem that needs to be addressed in a small and small-volume product such as the surface-mount current fuse of this embodiment. In the pair of wall portions 17a and 18a, a shadowed portion acts effectively with respect to the arc gas scattering direction, and suppresses insulation deterioration after interruption.

さらに、ケース１０の底部には一対の小さな排気孔１４、１５が形成されている。この排気孔１４、１５は、遮断時にアークガス圧を低下させる効果を有する。さらに、ケース１０の側面にも一対の小さな排気孔１９、２０が形成されている。この排気孔１９、２０も、遮断時にアークガス圧を低下させる効果を有する。   Further, a pair of small exhaust holes 14 and 15 are formed at the bottom of the case 10. The exhaust holes 14 and 15 have the effect of reducing the arc gas pressure when shut off. Further, a pair of small exhaust holes 19 and 20 are formed on the side surface of the case 10. The exhaust holes 19 and 20 also have the effect of reducing the arc gas pressure when shut off.

本実施形態の表面実装型電流ヒューズは以下のように製造される。すなわち、図３の斜視図に示すように、一対の金属端子３０は、ループ状の頂部３１がある程度開いた状態で形成され、ヒューズエレメントアセンブリ４０の両端部が一対の金属端子３０の頂部３１に自動挿入される。その後、一対の第１の直線部３２ａ、３２ｂが互いに接するように押圧されて、所定の形状である略「Ω」状に整形され、さらにヒューズ線４１が溶接または半田付けされると同時に形状が固定化される。   The surface mount type current fuse of this embodiment is manufactured as follows. That is, as shown in the perspective view of FIG. 3, the pair of metal terminals 30 is formed in a state where the loop-shaped top portions 31 are opened to some extent, and both ends of the fuse element assembly 40 are connected to the top portions 31 of the pair of metal terminals 30. Automatically inserted. Thereafter, the pair of first straight portions 32a and 32b are pressed so as to contact each other, shaped into a predetermined shape of approximately “Ω”, and further, the shape of the fuse wire 41 is simultaneously welded or soldered. Fixed.

そして、ヒューズエレメントアセンブリ４０が組み立てられた状態で一対の金属端子３０の各頂部３１を一方の絶縁ケース部材１１ａ（または１１ｂ）内に収納すると共に、一対の金属端子３０の一対の第１の直線部３２ａ、３２ｂを絶縁ケース部材１１ａの窪み１２ａ、１３ａに挿入し、その後、他方の絶縁ケース部材１１ｂ（または１１ａ）を被せることにより、ヒューズエレメントアセンブリ４０及び一対の金属端子３０が位置決めされる。その後、一対の絶縁ケース部材１１ａ、１１ｂの開放端面同士が溶融接合されてケース１０が構成される。この接合により一対の金属端子３０はケース１０で挟持され、その位置の安定化が図られる。   Then, in a state where the fuse element assembly 40 is assembled, the top portions 31 of the pair of metal terminals 30 are housed in one insulating case member 11a (or 11b), and a pair of first straight lines of the pair of metal terminals 30 The fuse element assembly 40 and the pair of metal terminals 30 are positioned by inserting the portions 32a and 32b into the recesses 12a and 13a of the insulating case member 11a and then covering the other insulating case member 11b (or 11a). Thereafter, the open end surfaces of the pair of insulating case members 11a and 11b are melt-bonded to form the case 10. By this joining, the pair of metal terminals 30 are sandwiched between the cases 10 and the positions thereof are stabilized.

このように本実施形態の表面実装型電流ヒューズは、自動機械による製造に適した構造を有するために、自動機械による製造が可能である。また、従来のように接着剤を使用する必要がないので、製造コストの低減を図ることができる。   Thus, since the surface mount type current fuse of this embodiment has a structure suitable for manufacture by an automatic machine, it can be manufactured by an automatic machine. In addition, since it is not necessary to use an adhesive as in the prior art, the manufacturing cost can be reduced.

なお、本実施形態では、一対の金属端子３０として、金属板を折り曲げ加工して形成されるものを使用する場合について説明したが、丸型線材を折り曲げ加工して一対の金属端子３０を形成してもよい。この場合、一対の第１の直線部３２ａ、３２ｂのみを元の丸型として残し、その他の部分、すなわち、ループ状の頂部３１、一対の第２の直線部３３ａ、３３ｂ、及び一対の第３の直線部３４ａ、３４ｂをそれぞれ平板状に加工してもよい。   In the present embodiment, the case where a pair of metal terminals 30 formed by bending a metal plate is used has been described. However, a pair of metal terminals 30 is formed by bending a round wire. May be. In this case, only the pair of first straight portions 32a and 32b is left as the original round shape, and other portions, that is, the loop-shaped top portion 31, the pair of second straight portions 33a and 33b, and the pair of third portions. The straight portions 34a and 34b may be processed into a flat plate shape.

（第２の実施形態）
図４は、本発明の第２の実施の形態に係る表面実装型電流ヒューズの全体の構成を示しており、図４（ａ）は一部を破断して示す正面図、図４（ｂ）は図４（ａ）のＡ−Ａ´線に沿った断面図、図４（ｃ）は下面図である。 (Second Embodiment)
FIG. 4 shows the overall configuration of the surface mount type current fuse according to the second embodiment of the present invention. FIG. FIG. 4A is a cross-sectional view taken along the line AA ′ of FIG. 4A, and FIG. 4C is a bottom view.

本実施形態の表面実装型電流ヒューズは、図１に示す第１の実施の形態のものと比べて、一対の金属端子３０の形状が異なる。すなわち、一対の金属端子３０のそれぞれは、金属板もしくは丸型線材（本例では金属板）を折り曲げ加工して形成されており、図４（ｂ）に示すように、ループ状の頂部３１、この頂部３１から伸びる第１の直線部３２ａ、第１の直線部３２ａの終端で略直角に折り曲げられた第２の直線部３３ａをそれぞれ有する。   The surface mount type current fuse of the present embodiment is different in shape of the pair of metal terminals 30 from that of the first embodiment shown in FIG. That is, each of the pair of metal terminals 30 is formed by bending a metal plate or a round wire (in this example, a metal plate), and as shown in FIG. A first straight portion 32a extending from the top portion 31 and a second straight portion 33a bent at a substantially right angle at the end of the first straight portion 32a are provided.

この場合にも、ヒューズエレメントアセンブリ４０は、両端部が一対の金属端子３０の各頂部３１の内側に挿入されて保持されるように組み立てられており、かつヒューズ線４２は各頂部３１で一対の金属端子３０に対してスポット溶接または半田付け等の手段によって電気的に接合されている。   Also in this case, the fuse element assembly 40 is assembled so that both end portions are inserted and held inside the top portions 31 of the pair of metal terminals 30, and the fuse wire 42 is paired with the top portions 31. The metal terminal 30 is electrically joined by means such as spot welding or soldering.

そして、ヒューズエレメントアセンブリ４０が組み立てられた状態で一対の金属端子３０の各頂部３１がケース１０の内部に位置するように、一対の金属端子３０の各第１の直線部３２ａがケース１０の底部の一対の端子挿入孔１２、１３を貫通するように挿入されている。   The first linear portions 32a of the pair of metal terminals 30 are the bottom portions of the case 10 so that the top portions 31 of the pair of metal terminals 30 are located inside the case 10 in a state where the fuse element assembly 40 is assembled. Are inserted through the pair of terminal insertion holes 12 and 13.

図４（ｂ）に示すように、一対の金属端子３０の各第２の直線部３３ａはケース外部に露出した状態となり、各第２の直線部３３ａはケース１０の底部に沿うように位置して、プリント基板に半田付けにより接合する際に使用される電極端子を構成する。この場合、一対の金属端子３０の第２の直線部３３ａは、各第１の直線部３２ａの終端で折り曲げられてそれぞれ反対方向に伸びている。すなわち、図４（ｃ）に示すように、表面実装型電流ヒューズの下面側から見ると、一対の金属端子３０の第２の直線部３３ａは対角線上に位置する。   As shown in FIG. 4B, the second straight portions 33 a of the pair of metal terminals 30 are exposed to the outside of the case, and the second straight portions 33 a are positioned along the bottom of the case 10. Thus, an electrode terminal used for joining to the printed board by soldering is configured. In this case, the second straight portions 33a of the pair of metal terminals 30 are bent at the ends of the first straight portions 32a and extend in opposite directions. That is, as shown in FIG. 4C, when viewed from the lower surface side of the surface-mount current fuse, the second straight portions 33a of the pair of metal terminals 30 are located on a diagonal line.

本実施形態では、一対の金属端子３０はそれぞれ１本の第２の直線部３３ａを有し、この１本の第２の直線部３３ａがケースの底部に設けられた一対の端子挿入孔１２、１３を貫通するので、端子挿入孔１２、１３を構成する図２中に示す端子挿入孔用の窪み１２ａ、１３ａの形状は、図１のものよりも小さい。   In the present embodiment, each of the pair of metal terminals 30 has one second straight portion 33a, and the one second straight portion 33a is a pair of terminal insertion holes 12 provided at the bottom of the case, 13, the shape of the terminal insertion hole recesses 12a and 13a shown in FIG. 2 constituting the terminal insertion holes 12 and 13 is smaller than that of FIG.

なお、本実施形態では、一対の金属端子３０には第３の直線部３４ａが設けられていない場合について説明したが、第１の実施形態のものと同様に第３の直線部３４ａを設けるようにしてもよい。この第３の直線部３４ａは、プリント基板に接合した後の導通を確認するためのテスト端子として使用できる。   In the present embodiment, the case where the third straight portion 34a is not provided in the pair of metal terminals 30 has been described. However, the third straight portion 34a is provided as in the first embodiment. It may be. The third linear portion 34a can be used as a test terminal for confirming conduction after being bonded to the printed board.

（第３の実施形態）
図５は、本発明の第３の実施の形態に係る表面実装型電流ヒューズの全体の構成を示しており、図５（ａ）は一部を破断して示す正面図、図５（ｂ）は図５（ａ）のＡ−Ａ´線に沿った断面図、図５（ｃ）は下面図である。 (Third embodiment)
FIG. 5 shows the overall configuration of a surface mount type current fuse according to the third embodiment of the present invention. FIG. 5 (a) is a partially cutaway front view, and FIG. 5 (b). FIG. 5A is a cross-sectional view taken along the line AA ′ in FIG. 5A, and FIG. 5C is a bottom view.

本実施形態の表面実装型電流ヒューズは、図４に示す第２の実施の形態のものと比べて、一対の金属端子３０の第２の直線部３３ａが各第１の直線部３２ａの終端で折り曲げられてそれぞれ同一方向に伸びている点が異なる。例えば、図５（ｃ）に示すように、表面実装型電流ヒューズの下面側から見ると、一対の金属端子３０の第２の直線部３３ａは一方の絶縁ケース部材１１ｂ側に折り曲げられている。   Compared with the second embodiment shown in FIG. 4, the surface mount type current fuse of the present embodiment has the second straight portions 33 a of the pair of metal terminals 30 at the end of each first straight portion 32 a. It is different in that it is bent and extends in the same direction. For example, as shown in FIG. 5C, when viewed from the lower surface side of the surface-mount current fuse, the second straight portion 33a of the pair of metal terminals 30 is bent toward the one insulating case member 11b.

本実施形態では、第２の実施形態と同様に、一対の金属端子３０はそれぞれ１本の第２の直線部３３ａを有し、この１本の第２の直線部３３ａがケースの底部に設けられた一対の端子挿入孔１２、１３を貫通するので、端子挿入孔１２、１３を構成する図２中に示す端子挿入孔用の窪み１２ａ、１３ａの形状は、図１のものよりも小さい。   In this embodiment, like the second embodiment, each of the pair of metal terminals 30 has one second straight portion 33a, and this one second straight portion 33a is provided at the bottom of the case. Since the terminal insertion holes 12 and 13 are penetrated, the shape of the terminal insertion hole depressions 12a and 13a shown in FIG. 2 constituting the terminal insertion holes 12 and 13 is smaller than that of FIG.

なお、本実施形態では、一対の金属端子３０には第３の直線部３４ａが設けられていない場合について説明したが、第１の実施形態のものと同様に第３の直線部３４ａを設けるようにしてもよい。この第３の直線部３４ａは、プリント基板に接合した後の導通を確認するためのテスト端子として使用できる。   In the present embodiment, the case where the third straight portion 34a is not provided in the pair of metal terminals 30 has been described. However, the third straight portion 34a is provided as in the first embodiment. It may be. The third linear portion 34a can be used as a test terminal for confirming conduction after being bonded to the printed board.

（第４の実施形態）
図６は、本発明の第４の実施の形態に係る表面実装型電流ヒューズの全体の構成を示しており、図６（ａ）は一部を破断して示す正面図、図６（ｂ）は図６（ａ）のＡ−Ａ´線に沿った断面図、図６（ｃ）は下面図である。 (Fourth embodiment)
FIG. 6 shows the overall structure of a surface mount type current fuse according to the fourth embodiment of the present invention, FIG. 6 (a) is a partially cutaway front view, and FIG. 6 (b). FIG. 6A is a cross-sectional view taken along the line AA ′ of FIG. 6A, and FIG.

本実施形態の表面実装型電流ヒューズは、図１に示す第１の実施の形態のものと比べて、一対の壁部１７ａ、１８ａがそれぞれ省略され、一対の金属端子３０の各頂部３１を保持するための、絶縁ケース部材と一体で成型された一対の壁部２２ａ、２３ａが設けられている。この一対の壁部２２ａ、２３ａは、頂部３１と当接する部分が、頂部３１の外形に合わせてほぼ半円状にくり抜かれており、組み立て時にヒューズエレメントアセンブリ４０が曲がらないようにするためのガイドの役目を果たすと共に、製造後に振動や衝撃などがヒューズエレメントアセンブリ４０に加わらないようにして信頼性を向上させる役目を果たす。さらに、一対の壁部２２ａ、２３ａは、図１に示す一対の壁部１７ａ、１８ａと同様に、遮断時に発生するアークガスの飛散に対してブロックする役割を有する。 In the surface mount type current fuse of the present embodiment, the pair of wall portions 1 7 a and 1 8 a are omitted, respectively, as compared with that of the first embodiment shown in FIG. A pair of wall portions 22a and 23a formed integrally with the insulating case member for holding the top portion 31 are provided. The pair of wall portions 22a and 23a have portions that come into contact with the top portion 31 cut out in a semicircular shape in accordance with the outer shape of the top portion 31, and a guide for preventing the fuse element assembly 40 from being bent during assembly. It also serves to improve reliability by preventing vibration and shock from being applied to the fuse element assembly 40 after manufacturing. Furthermore, the pair of wall portions 22a, 23a, like the pair of walls 1 7 a, 1 8 a shown in FIG. 1 has the role of blocking against scattering of arc gas generated during blocking.

なお、本実施形態の表面実装型電流ヒューズで用いられている一対の壁部２２ａ、２３ａを、第２及び第３の実施形態の表面実装型電流ヒューズに用いることができる。   The pair of wall portions 22a and 23a used in the surface mount type current fuse of the present embodiment can be used for the surface mount type current fuses of the second and third embodiments.

以上、実施形態を用いて本発明を説明したが、本発明は上記実施形態に限定されるものではなく、実施段階ではその要旨を逸脱しない範囲で種々に変形することができる。また、上記実施形態には種々の段階の発明が含まれており、開示される複数の構成要件の適宜な組み合わせにより種々の発明が抽出し得る。例えば実施形態に示される全構成要件からいくつかの構成要件が削除されても、発明が解決しようとする課題の欄で述べた課題の少なくとも１つが解決でき、発明の効果の欄で述べられている効果の少なくとも１つが得られる場合には、この構成要件が削除された構成が発明として抽出され得る。   As mentioned above, although this invention was demonstrated using embodiment, this invention is not limited to the said embodiment, In the implementation stage, it can change variously in the range which does not deviate from the summary. Further, the above embodiments include inventions at various stages, and various inventions can be extracted by appropriately combining a plurality of disclosed constituent elements. For example, even if some constituent elements are deleted from all the constituent elements shown in the embodiment, at least one of the problems described in the column of the problem to be solved by the invention can be solved, and is described in the column of the effect of the invention. When at least one of the effects is obtained, a configuration in which this configuration requirement is deleted can be extracted as an invention.

本発明の第１の実施の形態に係る表面実装型電流ヒューズの全体の構成を示しており、図１（ａ）は正面図、図１（ｂ）は断面図、図１（ｃ）は下面図。1 shows an overall configuration of a surface-mount current fuse according to a first embodiment of the present invention, in which FIG. 1A is a front view, FIG. 1B is a cross-sectional view, and FIG. Figure. 図１中の一対の絶縁ケース部材の一方のみを示す斜視図。The perspective view which shows only one side of a pair of insulation case member in FIG. 図１中のヒューズエレメントアセンブリの組み立て方法を説明するための斜視図。The perspective view for demonstrating the assembly method of the fuse element assembly in FIG. 本発明の第２の実施の形態に係る表面実装型電流ヒューズの全体の構成を示しており、図４（ａ）は正面図、図４（ｂ）は断面図、図４（ｃ）は下面図。FIGS. 4A and 4B show the overall structure of a surface-mount current fuse according to a second embodiment of the present invention, FIG. 4A is a front view, FIG. 4B is a cross-sectional view, and FIG. Figure. 本発明の第３の実施の形態に係る表面実装型電流ヒューズの全体の構成を示しており、図５（ａ）は正面図、図５（ｂ）は断面図、図５（ｃ）は下面図。FIGS. 5A and 5B show the overall configuration of a surface-mount current fuse according to a third embodiment of the present invention, FIG. 5A is a front view, FIG. 5B is a cross-sectional view, and FIG. Figure. 本発明の第４の実施の形態に係る表面実装型電流ヒューズの全体の構成を示しており、図６（ａ）は正面図、図６（ｂ）は断面図、図６（ｃ）は下面図。FIGS. 6A and 6B show an overall configuration of a surface-mount current fuse according to a fourth embodiment of the present invention, FIG. 6A is a front view, FIG. 6B is a cross-sectional view, and FIG. Figure.

符号の説明Explanation of symbols

１０…ケース、１１ａ、１１ｂ…絶縁ケース部材、１２、１３…端子挿入孔、１２ａ、１３ａ…端子挿入孔用の窪み、１４、１５…排気孔、１４ａ、１５ａ…排気孔用の窪み、１７ａ、１８ａ…壁部、１９、２０…排気孔、１９ａ、２０ａ…排気孔用の窪み、３０…金属端子、３１…ループ状の頂部、３２ａ、３２ｂ…第１の直線部、３３ａ、３３ｂ…第２の直線部、３４ａ、３４ｂ…第３の直線部、４０…ヒューズエレメントアセンブリ、４１…ガラス繊維束、４２…ヒューズ線。 DESCRIPTION OF SYMBOLS 10 ... Case, 11a, 11b ... Insulating case member, 12, 13 ... Terminal insertion hole, 12a, 13a ... Depression for terminal insertion hole, 14, 15 ... Exhaust hole, 14a, 15a ... Depression for exhaust hole, 17 a, 1 8 a ... wall portion, 19, 20 ... exhaust port, 19a, 20a ... recess for exhaust hole, 30 ... metal terminal, 31 ... top-shaped loop, 32a, 32 b ... first straight portion, 33a, 33b ... 2nd straight part, 34a, 34b ... 3rd straight part, 40 ... fuse element assembly, 41 ... glass fiber bundle, 42 ... fuse wire.

Claims (6)

それぞれ略直方体の箱型形状を有する一対の絶縁ケース部材を溶融接合して構成されると共に、底部に一対の端子挿入孔が設けられたケースと、
ループ状の頂部、この頂部から同一方向に伸びる一対の第１の直線部、及び一対の第１の直線部の各終端で略直角に折り曲げられてそれぞれ反対方向に伸びる一対の第２の直線部を有する一対の金属端子と、
束ねた棒状のガラス繊維材にヒューズ線が螺旋状に所定のピッチで巻回されているヒューズエレメントアセンブリを具備し、
前記一対の金属端子の各頂部は前記ケースの内部に位置し、
前記ヒューズエレメントアセンブリの両端部は前記一対の金属端子の各頂部の内側に挿入されて保持され、かつ前記ヒューズ線が各頂部で前記一対の金属端子に電気的に接合されており、
前記一対の金属端子の一対の第１の直線部は前記ケースの底部に設けられた一対の端子挿入孔を貫通して前記一対の第２の直線部が前記ケース外部に露出し、
第２の直線部は前記ケースの底部に沿うように位置して電極端子を構成し、
前記一対の絶縁ケース部材は、前記ケース内部の互いに対向する位置に、前記一対の金属端子の前記ループ状の頂部を保持する絶縁ケース部材と一体で成型された一対の壁部を有することを特徴とする表面実装型電流ヒューズ。 A case in which a pair of insulating case members each having a substantially rectangular parallelepiped box shape are fused and joined, and a pair of terminal insertion holes provided at the bottom,
A loop-shaped top portion, a pair of first straight portions extending from the top in the same direction, and a pair of second straight portions that are bent at substantially right angles at respective ends of the pair of first straight portions and extend in opposite directions. A pair of metal terminals having
A fuse element assembly in which a fuse wire is spirally wound at a predetermined pitch on a bundled rod-shaped glass fiber material;
Each top of the pair of metal terminals is located inside the case,
Both ends of the fuse element assembly are inserted and held inside the tops of the pair of metal terminals, and the fuse wire is electrically joined to the pair of metal terminals at each top,
The pair of first straight portions of the pair of metal terminals pass through a pair of terminal insertion holes provided at the bottom of the case, and the pair of second straight portions are exposed to the outside of the case,
The second straight line portion is positioned along the bottom of the case to constitute an electrode terminal ,
The pair of insulating case members include a pair of wall portions formed integrally with an insulating case member that holds the loop-shaped top portions of the pair of metal terminals at positions facing each other inside the case. Surface mount type current fuse. それぞれ略直方体の箱型形状を有する一対の絶縁ケース部材を溶融接合して構成されると共に、底部に一対の端子挿入孔が設けられたケースと、
ループ状の頂部、この頂部から伸びる第１の直線部、及び第１の直線部の終端で略直角に折り曲げられた第２の直線部を有する一対の金属端子と、
束ねた棒状のガラス繊維材にヒューズ線が螺旋状に所定のピッチで巻回されているヒューズエレメントアセンブリを具備し、
前記一対の金属端子の各頂部は前記ケースの内部に位置し、
前記ヒューズエレメントアセンブリの両端部は前記一対の金属端子の各頂部の内側に挿入されて保持され、かつ前記ヒューズ線が各頂部で前記一対の金属端子に電気的に接合されており、
前記一対の金属端子の各第１の直線部は前記ケースの底部に設けられた一対の端子挿入孔を貫通して前記各第２の直線部が前記ケース外部に露出し、
第２の直線部は前記ケースの底部に沿うように位置して電極端子を構成し、
前記一対の絶縁ケース部材は、前記ケース内部の互いに対向する位置に、前記一対の金属端子の前記ループ状の頂部を保持する絶縁ケース部材と一体で成型された一対の壁部を有することを特徴とする表面実装型電流ヒューズ。 A case in which a pair of insulating case members each having a substantially rectangular parallelepiped box shape are fused and joined, and a pair of terminal insertion holes provided at the bottom,
A pair of metal terminals having a loop-shaped top portion, a first straight portion extending from the top portion, and a second straight portion bent at a substantially right angle at the end of the first straight portion;
A fuse element assembly in which a fuse wire is spirally wound at a predetermined pitch on a bundled rod-shaped glass fiber material;
Each top of the pair of metal terminals is located inside the case,
Both ends of the fuse element assembly are inserted and held inside the tops of the pair of metal terminals, and the fuse wire is electrically joined to the pair of metal terminals at each top,
Each first straight portion of the pair of metal terminals passes through a pair of terminal insertion holes provided in a bottom portion of the case, and each second straight portion is exposed to the outside of the case.
The second straight line portion is positioned along the bottom of the case to constitute an electrode terminal ,
The pair of insulating case members include a pair of wall portions formed integrally with an insulating case member that holds the loop-shaped top portions of the pair of metal terminals at positions facing each other inside the case. Surface mount type current fuse. 前記一対の絶縁ケース部材は、前記ケース内部の互いに対向する位置に、前記ヒューズエレメントアセンブリを保持する絶縁ケース部材と一体で成型された一対の壁部を有することを特徴とする請求項１または２記載の表面実装型電流ヒューズ。   The pair of insulating case members have a pair of wall portions molded integrally with an insulating case member that holds the fuse element assembly at positions facing each other inside the case. The surface mount current fuse described. 前記ケースの底部及び側面にはそれぞれ、前記ヒューズ線の遮断時のガス圧を低減する排気孔が設けられていることを特徴とする請求項１または２記載の表面実装型電流ヒューズ。   3. The surface mount type current fuse according to claim 1, wherein an exhaust hole for reducing a gas pressure when the fuse wire is cut off is provided in each of a bottom portion and a side surface of the case. 前記一対の金属端子の前記各第２の直線部は、前記各第１の直線部の終端で略直角に折り曲げられてそれぞれ反対方向に伸びていることを特徴とする請求項２記載の表面実装型電流ヒューズ。   3. The surface mounting according to claim 2, wherein the second straight portions of the pair of metal terminals are bent at substantially right angles at ends of the first straight portions and extend in opposite directions. Type current fuse. 前記一対の金属端子の前記各第２の直線部は、前記各第１の直線部の終端で略直角に折り曲げられてそれぞれ同一方向に伸びていることを特徴とする請求項２記載の表面実装型電流ヒューズ。   3. The surface mounting according to claim 2, wherein each of the second straight portions of the pair of metal terminals is bent at a substantially right angle at an end of each of the first straight portions and extends in the same direction. Type current fuse.
JP2007244431A 2007-09-20 2007-09-20 Surface-mount current fuse Expired - Fee Related JP4348385B2 (en)

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