EP2040281B1 - Fusible de courant monté en surface - Google Patents

Fusible de courant monté en surface Download PDF

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Publication number
EP2040281B1
EP2040281B1 EP08164573.1A EP08164573A EP2040281B1 EP 2040281 B1 EP2040281 B1 EP 2040281B1 EP 08164573 A EP08164573 A EP 08164573A EP 2040281 B1 EP2040281 B1 EP 2040281B1
Authority
EP
European Patent Office
Prior art keywords
pair
case
metal terminals
fuse
portions
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Not-in-force
Application number
EP08164573.1A
Other languages
German (de)
English (en)
Other versions
EP2040281A3 (fr
EP2040281A2 (fr
Inventor
Fumihiro Nippon Seisen Cable Ltd. Nakaji
Jae Sung Nippon Seisen Cable Ltd. Lee
Wataru Nippon Seisen Cable Ltd. Ishii
Terumi Nippon Seisen Cable Ltd. Shimano
Kazuaki Nippon Seisen Cable Ltd. Kabazawa
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nippon Seisen Cable Ltd
Original Assignee
Nippon Seisen Cable Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Nippon Seisen Cable Ltd filed Critical Nippon Seisen Cable Ltd
Publication of EP2040281A2 publication Critical patent/EP2040281A2/fr
Publication of EP2040281A3 publication Critical patent/EP2040281A3/fr
Application granted granted Critical
Publication of EP2040281B1 publication Critical patent/EP2040281B1/fr
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • 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

Definitions

  • the present invention relates to a surface-mount current fuse mounted on, for example, a printed circuit board.
  • a surface-mount current fuse to be mounted on a printed circuit board.
  • a conventional surface-mount current fuse for example, a type disclosed in Jpn. Pat. Appln. KOKAI Publication No. 9-63455 has been known.
  • pair of metal electrodes which hold a fuse wire are attached to its box-shaped main body at both ends and a lid portion is pressed down to a position where it is sunk slightly from the top surface of the main body.
  • the lid portion is bonded and fixed to the main body with adhesive agent so as to seal the interior, so that the fuse wire is stretched in a floating condition in an interior space of the main body.
  • the present invention has been achieved in views of the above-described circumstances and an object of the invention is to provide a surface-mount current fuse which can be manufactured with automatic equipment, allows its manufacturing cost to be reduced and is hardly affected by vibration and shock, thereby securing high reliability.
  • FIGS. 1A to 1C show the entire structure of a surface-mount current fuse according to the first embodiment of the present invention.
  • FIG. 1A is a partially broken front view thereof
  • FIG. 1B is a sectional view of FIG. 1A
  • FIG. 1C is a bottom view thereof.
  • the surface-mount current fuse of this embodiment includes a case 10, a pair of metal terminals 30 and a fuse element assembly 40.
  • the case 10 is configured by melting and joining open end faces of a pair of molded insulation case members 11a, 11b having a substantially rectangular parallelepiped box shape.
  • FIG. 2 is a perspective view showing one of the pair of insulation cases 11a, 11b.
  • Recesses 12a, 13a (or 12b, 13b) for terminal insertion holes 12, 13 are formed at corresponding positions of the bottom portion of the pair of insulation case members 11a, 11b, so that when the pair of insulation case members 11a, 11b are joined together, the pair of terminal insertion holes 12, 13 are formed in the bottom portion of the case 10, as shown in FIG. 1C .
  • recesses 14a, 15a (or 14b, 15b) for exhaust holes 14, 15 are formed at corresponding positions of the bottom portion of the pair of insulation case members 11a, 11b, so that when the pair of insulation case members 11a, 11b are joined together, the pair of exhaust holes 14, 15 having a smaller diameter than the terminal insertion holes 12, 13 are formed in the bottom portion of the case 10, as shown in FIG. 1C .
  • Pair of wall portions 17a, 18a is formed by being molded integrally with the insulation case members at opposed positions within the pair of insulation case members 11a, 11b in order to hold the fuse element assembly 40 as shown in FIG. 2 .
  • recesses 19a, 20a (or 19b, 20b) for exhaust holes 19, 20 are formed so as to form a pair of exhaust holes 19, 20 in a pair of side faces of the case 10 when the pair of insulation case members 11a, 11b are joined together.
  • the size of the recesses 19a, 20a (19b, 20b) is substantially the same as the size of the recesses 14a, 15a (or 14b, 15b).
  • the side faces of the case 10 in which the exhaust holes 19, 20 are to be formed are side faces opposed to end faces of both end portions of the fuse element assembly 40.
  • the pair of metal terminals 30 is formed by bending a metal sheet or a round linear material (metal sheet in this example). As shown in FIG. 1B , the pair of metal terminals 30 are constituted of loop-like apex portions 31, a pair of first linear portions 32a, 32b extending in the same direction from the apex portion 31, a pair of second linear portions 33a, 33b extending in opposite directions after being bent substantially at right angles at each terminal end of the pair of first linear portions 32a, 32b and a pair of third linear portions 34a, 34b extending in a direction toward the apex portion 31 after being bent substantially at right angles at each terminal end of the pair of second linear portions 33a, 33b. That is, each of the pair of metal terminals 30 has a substantially ⁇ shape.
  • the fuse element assembly 40 is configured by winding a fuse wire 42 spirally around a rod-like glass fiber bundle 41 at a predetermined pitch.
  • the fuse wire 42 is heated by Joule heat produced when a current larger than a rated one (abnormal current produced by an eddy current or a circuit problem) flows so that it is melted in a predetermined time.
  • the fuse wire 42 is different in diameter and material depending on the rated current, and designed and set to satisfy each characteristic.
  • the fuse element assembly 40 is constructed so that both end portions thereof are inserted and held in the interior of each apex portion 31 of the pair of metal terminals 30, and the fuse wire 42 is connected electrically to the pair of metal terminals 30 at each apex portion 31 by spot welding, soldering or the like.
  • the pair of first linear portions 32a, 32b of each of the pair of metal terminals 30 are inserted through each of the pair of terminal insertion holes 12, 13 in the bottom portion of the case 10 so that the apex portions 31 of the pair of metal terminals 30 are located within the interior of the case 10 when the fuse element assembly 40 is assembled.
  • the pairs of the second linear portions 33a, 33b and the third linear portions 34a, 34b of each of the pair of metal terminals 30 are exposed out of the case.
  • the second linear portions 33a, 33b are located along the bottom portion of the case 10 thereby constituting an electrode terminal for use at the time of joining to a printed circuit board by soldering.
  • the third linear portions 34a, 34b are located along the external shape of the case side faces to sandwich the case from both sides.
  • recess portions 21 are formed in the pair of insulation case members 11a, 11b.
  • the third linear portions 34a, 34b can be used as a test terminal for confirming conduction of the fuse wire 42 after being joined to a printed circuit board.
  • the pair of wall portions 17a, 18a (17b, 18b) molded integrally with the insulation case member are provided at opposed positions in the interior of the pair of insulation case members 11a, 11b in order to hold the fuse element assembly 40.
  • the pair of wall portions 17a, 18a (17b, 18b) are bored into a substantially semicircular shape agreeing with the external shape of the assembly 40 at a portion which makes contact with the fuse element assembly 40, thereby taking a role as a guide for preventing the fuse element assembly 40 from being bent at the time of manufacture and preventing vibration or shock from being applied to the fuse element assembly 40 after manufacture so as to improve the reliability of the product.
  • the pair of wall portions 17a, 18a (17b, 18b) take a role of blocking scattering of arc gas produced when the current fuse is shut down.
  • a large current short-circuit current
  • the fuse wire is melted substantially at a central portion where the temperature of the fuse element assembly 40 reaches a highest point with a rapid temperature rise of the fuse element assembly 40.
  • Arc gas produced at this time contains metallic vapor, thereby deterioration of insulation being likely produced after the shutdown.
  • This is an important technical problem which should be solved in a small-size, small-volume product like the surface-mount current fuse of the present invention.
  • a portion which acts as a shadow acts effectively in a scattering direction of arc gas, thereby suppressing deterioration of the insulation after the shutdown.
  • Pair of small exhaust holes 14, 15 is formed in the bottom portion of the case 10.
  • the exhaust holes 14, 15 have an effect of reducing the pressure of the arc gas at the time of the shutdown.
  • the pair of small exhaust holes 19, 20 are formed in the side faces of the case 10.
  • the exhaust holes 19, 20 also have the effect of reducing the pressure of the arc gas at the time of the shutdown.
  • the surface-mount current fuse of this embodiment is manufactured as follows. That is, as shown in FIG. 3 , the pair of metal terminals 30 is formed in a condition in which the loop-like apex portion 31 is open to some extent and both end portions of the fuse element assembly 40 are automatically inserted into the apex portions 31 of the pair of metal terminals 30. After that, the first linear portions 32a, 32b are pressed against each other to come into contact with each other, so that they are formed into a substantially ⁇ shape, which is a predetermined shape, and the fuse wire 41 is welded or soldered to the apex portion 31 while the shape thereof is fixed.
  • the apex portions 31 of the pair of metal terminals 30 are accommodated within the insulation case member 11a (or 11b) on one side and the pair of first linear portions 32a, 32b of each of the pair of metal terminals 30 is inserted into the recesses 12a, 13a in the insulation case member 11a.
  • the other insulation case member 11b (or 11a) is mounted so that the fuse element assembly 40 and the pair of metal terminals 30 are positioned.
  • the open end faces of the pair of insulation case members 11a, 11b are melted and joined together so as to build up the case 10.
  • the pair of metal terminals 30 is sandwiched by the case 10 so as to stabilize the position thereof.
  • the surface-mount current fuse of this embodiment can be manufactured with automatic equipment because it has a structure suitable for the manufacturing with the automatic equipment. Further, because it does not need the use of an adhesive agent as is conventional, manufacturing cost thereof can be reduced.
  • the pair of metal terminals 30 may be formed by bending a round wire material.
  • FIGS. 4A to 4C show the entire structure of a surface-mount current fuse according to the second embodiment of the present invention.
  • FIG. 4A is a partially broken perspective view thereof
  • FIG. 4B is a sectional view thereof
  • FIG. 4C is a bottom view thereof.
  • the surface-mount current fuse of this embodiment is different from the first embodiment shown in FIG. 1 in the shape of the pair of metal terminals 30. That is, each of the pair of metal terminals 30 is formed by bending a metal sheet or a rounded wire material (metal sheet in this example). As shown in FIG. 4B , the metal terminal is composed of a loop-like apex portion 31, a first linear portion 32a extending from this apex portion 31 and a second linear portion 33a bent substantially at right angles at a terminal end of the first linear portion 32a.
  • the fuse element assembly 40 is configured so that both end portions thereof are inserted and held in the interior of the apex portions 31 of the pair of metal terminals 30 and the fuse wire 42 is joined electrically to the apex portions 31 of the pair of metal terminals 30 by spot welding, soldering or the like.
  • Each first linear portion 32a of the pair of metal terminals 30 is inserted through each of the pair of terminal insertion holes 12, 13 in the bottom portion of the case 10, so that the apex portions 31 of the pair of metal terminals 30 are located within the interior of the case 10 when the fuse element assembly 40 is assembled.
  • the second linear portion 33a of the pair of metal terminals 30 is exposed out of the case and the second linear portion 33a is located along the bottom portion of the case 10, thereby constructing an electrode terminal for use in joining of this current fuse to a printed circuit board by soldering.
  • the second linear portions 33a of the pair of metal terminals 30 are bent at a terminal end of the first linear portion 32a and extended in opposite directions to each other. That is, as shown in FIG. 4C , the second linear portions 33a of the pair of metal terminals 30 are located on a diagonal line as seen from the bottom side of the surface-mount current fuse.
  • each of the pair of metal terminals 30 has one second linear portion 33a. Because this second linear portion 33a penetrates each of the pair of terminal insertion holes 12, 13 provided in the bottom portion of the case, the shape of the recesses 12a, 13a (or 12b, 13b) for the terminal insertion holes shown in FIG. 2 which constitute the terminal insertion holes 12, 13 is smaller than in FIG. 1 .
  • this embodiment may be modified by providing the third linear portion 34a like the first embodiment.
  • This third linear portion 34a can be used as a test terminal for confirming conduction of the fuse wire 42 after this is joined to the printed circuit board.
  • FIGS. 5A to 5C show the entire structure of the surface-mount current fuse according to the third embodiment of the present invention.
  • FIG. 5A is a partially broken front view thereof
  • FIG. 5B is a sectional view of FIG. 5A
  • FIG. 5C is a bottom view thereof.
  • the second linear portions 33a of the pair of metal terminals 30 are bent at each terminal end of the first linear portion 32a and extended in the same directions, which is different from the second embodiment shown in FIG. 4 .
  • the second linear portions 33a of the pair of metal terminals 30 are bent toward the insulation case member 11b on one side as seen from the bottom side of the surface-mount current fuse.
  • each of the pair of metal terminals 30 has one second linear portion 33a. Because this second linear portion 33a penetrates each of the pair of terminal insertion holes 12, 13 provided in the bottom portion of the case, the shape of the recesses 12a, 13a (or 12b, 13b) for the terminal insertion hole shown in FIG. 2 which constitute the terminal insertion holes 12, 13 is smaller than in FIG. 1 .
  • this embodiment may be modified to be provided with the third linear portion 34a like the first embodiment.
  • This third linear portion 34a can be used as a test terminal for confirming conduction of the fuse wire 42 after this current fuse is joined to a printed circuit board.
  • FIGS. 6A to 6C show the entire configuration of a surface-mount current fuse according to the fourth embodiment of the present invention.
  • FIG. 6A is a partially broken front view thereof
  • FIG. 6B is a sectional view of FIG. 6A
  • FIG. 6C is a bottom view thereof.
  • the pair of wall portions 17a, 18a (17b, 18b) is omitted from the first embodiment shown in FIG. 1 .
  • a pair of wall portions 22a, 23a (22b, 23b) formed integrally with the insulation case members are provided to hold each apex portion 31 of the pair of metal terminals 30.
  • the pair of wall portions 22a, 23a (22b, 23b) are bored into a substantially semicircular shape which agrees with the external shape of the apex portion 31 at a portion which makes contact with the apex portion 31.
  • This pair of wall portions 22a, 23a (22b, 23b) take a role as a guide for preventing the fuse element assembly 40 from being bent at the time of assembly and a role of improving the reliability by preventing vibration or shock from being applied to the fuse element assembly 40 after this current fuse is manufactured. Further, the pair of wall portions 22a, 23a (22b, 23b) take a role of blocking scattering of arc gas produced at the time of shutdown like the pair of wall portions 17a, 18a (17b, 18b) shown in FIG. 1 .
  • the pair of wall portions 22a, 23a (22b, 23b) for use in the surface-mount current fuse of this embodiment may be used in the surface-mount current fuse of the second and third embodiments.

Landscapes

  • Fuses (AREA)

Claims (4)

  1. Fusible de courant monté en surface comprenant :
    un boîtier (10) qui est fabriqué par fusion et jonction de deux faces d'extrémités d'une paire d'éléments de boîtier d'isolation (11a, 11b) ayant chacun une forme de boîte parallélépipède rectangle et est doté d'une paire de trous d'insertion de bornes (12, 13) au niveau d'une partie inférieure de celui-ci,
    une paire de bornes métalliques (30) ayant chacune une partie de sommet en forme de boucle (31), une première partie linéaire (32a) s'étendant depuis la partie de sommet et une deuxième partie linéaire (33a) qui est pliée globalement à angle droit au niveau d'une extrémité de borne de la première partie linéaire, et
    un ensemble d'élément fusible (40) dans lequel un fil fusible (42) est entouré autour de matériaux de fibre de verre semblables à des tiges en faisceau (41) en spirale à un pas prédéterminé,
    dans lequel les parties de sommets (31) de la paire de bornes métalliques (30) sont situées à l'intérieur du boîtier (10),
    les deux parties d'extrémités de l'ensemble d'élément fusible (40) sont insérées et maintenues dans les parties de sommets (31) de la paire de bornes métalliques (30) alors que le fil fusible (42) est lié électriquement à la paire de bornes métalliques (30) au niveau de chaque partie de sommet (31),
    la première partie linéaire (32a) de la paire de bornes métalliques (30) pénètre la paire de trous d'insertion de bornes (12, 13) prévus dans la partie inférieure du boîtier (10) de sorte que la paire de deuxièmes parties linéaires (33a) soit exposée à l'extérieur du boîtier (10), et caractérisé en ce que
    les deuxièmes parties linéaires (33a) sont situées le long de la partie inférieure du boîtier (10) en constituant de cette manière une borne d'électrode,
    dans lequel chaque borne de la paire de bornes métalliques (30) possède une troisième partie linéaire (32b) s'étendant dans la même direction que la direction d'extension de la première partie linéaire (32a) à partir de la partie de sommet en forme de boucle (31) et une quatrième partie linéaire (33b) qui est pliée dans une direction opposée à celle de la deuxième partie linéaire (33a) au niveau d'une extrémité de borne de la troisième partie linéaire.
  2. Fusible de courant monté en surface selon la revendication 1, caractérisé en ce que la paire d'éléments de boîtier d'isolation (11a, 11b) a une paire de parties de parois (17a, 18a, 17b, 18b) qui maintiennent l'ensemble d'élément fusible (40) et sont moulées de manière solidaire avec l'élément de boîtier d'isolation à des positions opposées les unes par rapport aux autres à l'intérieur du boîtier (10).
  3. Fusible de courant monté en surface selon la revendication 1, caractérisé en ce que des trous d'évacuation (14, 15, 19, 20) destinés à réduire une pression de gaz lorsque le fil fusible (42) est interrompu sont prévus dans la partie inférieure et les faces latérales du boîtier (10).
  4. Fusible de courant monté en surface selon la revendication 1, caractérisé en ce que la paire d'éléments de boîtier d'isolation (11a, 11b) a une paire de parties de parois (22a, 23a, 22b, 23b) qui sont moulées de manière solidaire avec l'élément de boîtier d'isolation et maintiennent la partie de sommet (31) de la paire de bornes métalliques (30) à des positions opposées les unes par rapport aux autres à l'intérieur du boîtier (10).
EP08164573.1A 2007-09-20 2008-09-18 Fusible de courant monté en surface Not-in-force EP2040281B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2007244431A JP4348385B2 (ja) 2007-09-20 2007-09-20 表面実装型電流ヒューズ

Publications (3)

Publication Number Publication Date
EP2040281A2 EP2040281A2 (fr) 2009-03-25
EP2040281A3 EP2040281A3 (fr) 2012-12-19
EP2040281B1 true EP2040281B1 (fr) 2014-06-04

Family

ID=40225583

Family Applications (1)

Application Number Title Priority Date Filing Date
EP08164573.1A Not-in-force EP2040281B1 (fr) 2007-09-20 2008-09-18 Fusible de courant monté en surface

Country Status (3)

Country Link
EP (1) EP2040281B1 (fr)
JP (1) JP4348385B2 (fr)
KR (1) KR101017119B1 (fr)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102496536A (zh) * 2011-12-27 2012-06-13 东莞市贝特电子科技有限公司 一种防爆保险丝及其制造方法
JP6437239B2 (ja) * 2013-08-28 2018-12-12 デクセリアルズ株式会社 ヒューズエレメント、ヒューズ素子
US10325746B2 (en) * 2016-11-15 2019-06-18 Littelfuse, Inc. Ventilated fuse housing
DE102017214682B4 (de) 2017-08-22 2019-03-07 Leoni Bordnetz-Systeme Gmbh Elektrisches Sicherungselement und Leiterplatte mit darauf angelötetem elektrischen Sicherungselement
US10854413B2 (en) * 2017-11-27 2020-12-01 Conquer Electronics Co., Ltd. Fuse line fixing structure of fuse
TWI743008B (zh) * 2021-03-11 2021-10-11 功得電子工業股份有限公司 貼片保險絲

Family Cites Families (8)

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DE2949432C2 (de) * 1979-12-08 1986-08-07 Georg Rudolf 8411 Zeitlarn Sillner Stecksicherung
US4751489A (en) 1986-08-18 1988-06-14 Cooper Industries, Inc. Subminiature fuses
DE8704621U1 (de) 1987-03-28 1987-07-02 Wickmann-Werke GmbH, 5810 Witten Elektrische Sicherung
JP2717076B2 (ja) 1995-08-30 1998-02-18 エス・オー・シー株式会社 表面実装超小型電流ヒューズ
JP3820143B2 (ja) * 2001-02-16 2006-09-13 エス・オー・シー株式会社 表面実装型小型ヒューズ
CN1249761C (zh) * 2001-03-02 2006-04-05 威克曼工厂股份有限公司 制造熔丝元件的方法
JP2004253218A (ja) * 2003-02-19 2004-09-09 Nippon Seisen Kk 小型ヒューズ
KR100689021B1 (ko) 2004-12-17 2007-03-12 스마트전자 주식회사 표면실장형 소형 퓨즈 및 그 제조방법

Also Published As

Publication number Publication date
KR101017119B1 (ko) 2011-02-25
KR20090031280A (ko) 2009-03-25
EP2040281A3 (fr) 2012-12-19
JP2009076330A (ja) 2009-04-09
EP2040281A2 (fr) 2009-03-25
JP4348385B2 (ja) 2009-10-21

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