JP4735387B2 - Surface mount type current fuse - Google Patents

Surface mount type current fuse Download PDF

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Publication number
JP4735387B2
JP4735387B2 JP2006114176A JP2006114176A JP4735387B2 JP 4735387 B2 JP4735387 B2 JP 4735387B2 JP 2006114176 A JP2006114176 A JP 2006114176A JP 2006114176 A JP2006114176 A JP 2006114176A JP 4735387 B2 JP4735387 B2 JP 4735387B2
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Japan
Prior art keywords
part
fuse element
fusing
case
portion
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Expired - Fee Related
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JP2006114176A
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JP2007287504A (en
Inventor
謙治 仙田
敏之 岩尾
和俊 松村
岳 渡辺
智幸 鷲▲崎▼
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パナソニック株式会社
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Priority to JP2006114176A priority Critical patent/JP4735387B2/en
Priority claimed from CN 200780009165 external-priority patent/CN101401181B/en
Publication of JP2007287504A publication Critical patent/JP2007287504A/en
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Publication of JP4735387B2 publication Critical patent/JP4735387B2/en
Application status is Expired - Fee Related legal-status Critical
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Description

  The present invention relates to a surface mount type current fuse that melts and protects various electronic devices when an overcurrent flows.

  As shown in FIG. 7, this type of conventional surface mount type current fuse is formed in a case 1 made of ceramic, a space 2 formed inside the case 1, and both ends of the case 1. The external electrode 3 and a fuse element portion 4 having a circular cross section electrically connected to the external electrode 3, and a fusing portion 5 of the fuse element portion 4 formed in the case 1. It was set as the structure arrange | positioned in.

As prior art document information relating to the invention of this application, for example, Patent Document 1 is known.
JP-A-8-162000

In the conventional surface mount type current fuse described above, the fuse element portion 4 having the same wire diameter or the same material is used. Therefore, the fusing characteristics such as the fusing current determined by the wire diameter and the material should be adjusted. Had the problem of not being able to.

  The present invention solves the above-described conventional problems, and an object of the present invention is to provide a surface mount type current fuse capable of adjusting the fusing characteristics.

  In order to achieve the above object, the present invention has the following configuration.

According to a first aspect of the present invention includes a case having an insulating property, and formed inside the space of the case, and external electrodes formed on both end portions of the casing, electrical and external electrodes And a fuse element part provided with a fusing part in the space part, and the fusing part is provided by irradiating a part of the fuse element part with a laser. Since the portion irradiated with the laser is deteriorated and the resistance value is increased, the fuse element portion can be easily melted without being cut, thereby obtaining an effect that the fusing characteristics can be adjusted. Is.

According to the second aspect of the present invention, the fuse element portion and the external electrode are formed of an integral metal, and according to this configuration, it is not necessary to connect the fuse element portion and the external electrode. Therefore, the effect that productivity can be improved is obtained.

In the invention according to claim 3 of the present invention, in particular, the thickness of the external electrode is made thinner than the thickness of the other portions. According to this configuration, the external electrode is thin, so that the external electrode is used as a case. Since it can be easily bent along and can be used as a terminal for connection to the outside as it is, there is an effect that it is not necessary to separately provide a terminal for connection.

In the invention according to claim 4 of the present invention, in particular, at least the melted portion is composed of two or more layers of metal, and according to this configuration, the melted portion can be alloyed or eutectic. Since the resistance value of the fusing part becomes high and can be easily melted by this, an effect that the fusing characteristics can be adjusted is obtained.

As described above, the surface mount type current fuse of the present invention includes an insulating case, a space formed inside the case, external electrodes formed at both ends of the case, and the external electrodes. A fuse element part electrically connected and having a fusing part disposed in the space part, and the fusing part is provided by irradiating a part of the fuse element part with a laser. Since the resistance portion is deteriorated and the resistance value is increased, the fuse element portion can be easily melted without being cut, and thereby an excellent effect that the fusing characteristics can be adjusted is achieved.

(Embodiment 1)
FIG. 1 is a perspective view of a surface-mount current fuse according to Embodiment 1 of the present invention, and FIG. 2 is a top cross-sectional view of the main part of the surface-mount current fuse.

As shown in FIGS. 1 and 2, the surface-mount current fuse according to the first embodiment of the present invention includes an insulating case 11, a space portion 12 formed inside the case 11, and the case 11. External electrodes 13 formed at both ends, and a fuse element portion 15 electrically connected to the external electrodes 13 and having a fusing portion 14 disposed in the space portion 12. The fusing part 14 is provided by cutting a part of the fuse element part 15.

  In the above configuration, the case 11 has an insulating property, is made of ceramic such as alumina or resin such as epoxy, and has a prismatic shape. A space 12 is formed inside the case 11, and the case 11 includes a bottom 11a and a lid 11b, and the bottom 11a and the lid 11b are joined with an adhesive.

  The external electrode 13 is composed of a cylindrical electrode cap formed at both ends of the case 11 and having a function as an external connection terminal. The cylindrical electrode cap is a cylindrical portion. Is attached to both ends of the case 11 by press fitting. The external electrode 13 may be provided by printing silver.

  Further, the fusing part 14 is formed by cutting a part of the fuse element part 15 at the central part. This cutting is performed by a mechanical method such as scribing or punching. The fusing part 14 is a part that blows when a current of a certain level or more flows, and is provided in the space part 12.

By providing the fusing part 14 in the space part 12 in this way, the heat generated in the fusing part 14 is not easily dissipated, so that the fusing part 14 can be heated to a higher temperature. If it flows, it can be surely blown out. Furthermore, the fusion portion 14 causes the heat storage by applying a low melting point glass or metal, in which may be caused to blow quickly.

  The fuse element portion 15 has a circular, square, or foil-like cross section, and is configured in a straight line. The fuse element portion 15 is stretched between the external electrodes 13 and is electrically connected to the external electrodes 13. Has been. The fuse element portion 15 is made of a metal having good conductivity such as silver, copper, nickel, and aluminum, and a fusing portion 14 disposed in the space portion 12 is formed at the center thereof. Further, both end portions of the fuse element portion 15 are placed on the upper surfaces of both end portions of the bottom portion 11 a of the case 11.

  Next, a method for manufacturing the surface mount type current fuse in the first embodiment of the present invention will be described.

  First, in FIGS. 1 and 2, the fuse element portion 15 is placed on the upper surface of both end portions of the bottom portion 11 a of the case 11 having the space portion 12. At this time, the central portion of the fuse element portion 15 is provided inside the space portion 12.

  Next, the fusing part 14 is formed by cutting the center part of the fuse element part 15 provided in the space part 12 by scribing or punching. At this time, cutting is performed while measuring the resistance value so that the resistance value becomes constant. The fusing part 14 may be formed in advance.

  Finally, the lid portion 11b of the case 11 is joined to the bottom portion 11a with an adhesive, and then external electrodes 13 formed of cylindrical electrode caps are formed on both ends of the case 11. At this time, the external electrode 13 and the fuse element portion 15 are electrically connected.

  In the first embodiment of the present invention described above, since the fusing part 14 is provided by cutting a part of the fuse element part 15, the wire diameter of the fusing part 14 is reduced by cutting the fuse element part 15. It is possible to adjust, thereby obtaining the effect that the fusing characteristics can be adjusted. Moreover, in this structure, since the resistance value of the fusing part 14 can be stabilized, fusing time can also be stabilized.

  Even when the fuse element portion 15 has a circular cross section and a large cross sectional area, if the fuse element portion 15 is cut as in the first embodiment of the present invention, the fusing portion 14 of the fuse element portion 15 is cut off. Since the area can be reduced, the current concentrates on the fusing part 14 and can be blown quickly.

  Further, when the cross section of the fuse element portion 15 is circular or the like, since the surface area is small, the heat dissipation is small and it is difficult to melt. Therefore, the heat radiation is increased, and it can be easily melted.

  In the first embodiment of the present invention, the fuse element portion 15 is cut by scribing, punching, or the like, but may be performed by a laser as shown in FIG. In this way, a predetermined resistance value can be obtained with high accuracy.

(Embodiment 2)
FIG. 4 is a perspective view of a surface-mount current fuse according to Embodiment 2 of the present invention, and FIG. 5 is a top cross-sectional view of the main part of the surface-mount current fuse. In the second embodiment of the present invention, components having the same configurations as those of the first embodiment of the present invention described above are denoted by the same reference numerals, and description thereof is omitted.

  4 and 5, the second embodiment of the present invention is different from the first embodiment of the present invention described above in that the fuse element portion 15 and the external electrode 13 are made of an integral metal. In this case, the external electrode 13 is bent along the end surface and the back surface of the bottom 11 a of the case 11.

  In the above configuration, since the fuse element portion 15 and the external electrode 13 are made of an integral metal, there is no need to connect the fuse element portion 15 and the external electrode 13, thereby improving productivity. The effect of being able to be obtained is obtained.

  In this case, as shown in FIG. 6, the thickness of the fusing part 14 in the fuse element part 15 may be made thinner than the thickness of other parts. Since the thickness of a certain fusing part 14 is thin, cutting can be performed easily and accurately. Further, the thickness of the external electrode 13 may be smaller than the thickness of other portions. In this case, since the thickness of the external electrode 13 is thin, the external electrode 13 can be easily bent along the case 11, And since it can be used as a terminal for connection with the outside as it is, it is not necessary to provide a connection terminal separately. And when making the thickness of the above-mentioned external electrode 13 and the thickness of the fusing part 14 thin, it is preferable to make thickness thin by extending by rolling.

  In the first and second embodiments of the present invention, the fusing part 14 is provided by cutting the fuse element part 15, but fusing by irradiating a part of the fuse element part 15 with a laser. The portion 14 may be provided, and in this case, since the portion irradiated with the laser deteriorates and the resistance value becomes high, the fuse element portion 15 can be easily melted without being cut. Fusing characteristics can be adjusted.

  In the fuse element portion 15, at least the fusing portion 14 may be formed of two or more layers of metal. In this case, the fusing portion 14 can be alloyed or eutecticized by laser irradiation. Since the resistance value of 14 becomes high and this can make the fusing part 14 easier to melt, fusing characteristics can be adjusted.

  Moreover, if the fusing part 14 is provided by irradiating the laser as described above, the resistance value of the fusing part 14 is increased, so that the fusing part 14 is easily melted. Therefore, even if the cross-sectional area of the fuse element portion 15 is increased so that it does not break even when a large current such as a surge flows, it can be blown if a predetermined current flows.

  The surface mount type current fuse according to the present invention has an effect that the fusing characteristics can be adjusted, and is useful in a surface mount type current fuse that melts and protects various electronic devices when an overcurrent flows. It will be.

1 is a perspective view of a surface-mount current fuse according to Embodiment 1 of the present invention. Top sectional view of the main part of the same surface mount type current fuse Top sectional view of the main part showing another example of the same surface mount type current fuse The perspective view of the surface mount type current fuse in Embodiment 2 of this invention Top sectional view of the main part of the same surface mount type current fuse Top sectional view of the main part showing another example of the same surface mount type current fuse Top sectional view of the main parts of a conventional surface mount type current fuse

11 Case 12 Space part 13 External electrode 14 Fusing part 15 Fuse element part

Claims (4)

  1. Insulating case, space formed inside the case, external electrodes formed at both ends of the case, and electrically connected to the external electrodes, and a fusing part is formed in the space. A surface mount type current fuse provided with a fuse element portion disposed therein and irradiating a part of the fuse element portion with a laser.
  2. Surface-mount current fuse according to claim 1, wherein the integrally configured of a metal and a fuse element portion and the outer electrode.
  3. 3. The surface mount type current fuse according to claim 2 , wherein the thickness of the external electrode is made thinner than the thickness of other portions.
  4. Surface-mount current fuse according to claim 1, wherein configuring the at least the fusing part in two or more layers of metal.
JP2006114176A 2006-04-18 2006-04-18 Surface mount type current fuse Expired - Fee Related JP4735387B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2006114176A JP4735387B2 (en) 2006-04-18 2006-04-18 Surface mount type current fuse

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
JP2006114176A JP4735387B2 (en) 2006-04-18 2006-04-18 Surface mount type current fuse
CN 200780009165 CN101401181B (en) 2006-03-16 2007-03-14 Surface-mount current fuse
US12/159,476 US8368502B2 (en) 2006-03-16 2007-03-14 Surface-mount current fuse
PCT/JP2007/055083 WO2007119358A1 (en) 2006-03-16 2007-03-14 Surface-mount current fuse

Publications (2)

Publication Number Publication Date
JP2007287504A JP2007287504A (en) 2007-11-01
JP4735387B2 true JP4735387B2 (en) 2011-07-27

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Cited By (7)

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US8919801B2 (en) 2010-12-15 2014-12-30 Symbotic, LLC Suspension system for autonomous transports
US8965619B2 (en) 2010-12-15 2015-02-24 Symbotic, LLC Bot having high speed stability
US9096375B2 (en) 2009-04-10 2015-08-04 Symbotic, LLC Storage and retrieval system
US9187244B2 (en) 2010-12-15 2015-11-17 Symbotic, LLC BOT payload alignment and sensing
US9321591B2 (en) 2009-04-10 2016-04-26 Symbotic, LLC Autonomous transports for storage and retrieval systems
US9499338B2 (en) 2010-12-15 2016-11-22 Symbotic, LLC Automated bot transfer arm drive system
US9561905B2 (en) 2010-12-15 2017-02-07 Symbotic, LLC Autonomous transport vehicle

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP5027284B2 (en) * 2010-06-03 2012-09-19 釜屋電機株式会社 Chip fuse and manufacturing method thereof

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01287905A (en) * 1988-05-13 1989-11-20 Murata Mfg Co Ltd Inductance element and manufacture thereof
JPH0335640U (en) * 1989-08-18 1991-04-08
JPH05166454A (en) * 1991-12-11 1993-07-02 Hitachi Chem Co Ltd Chip type fuse
JPH0569847U (en) * 1992-02-27 1993-09-21 瓊章 顔 Circuit breaking element without chip types of end caps
JPH10283906A (en) * 1997-04-08 1998-10-23 Taiheiyo Seiko Kk Circuit connector serving also as fuse
JPH11273541A (en) * 1998-03-25 1999-10-08 Skk:Kk Fuse
JP2002343223A (en) * 2001-05-10 2002-11-29 Koa Corp Fuse element
JP2004014224A (en) * 2002-06-05 2004-01-15 Nec Schott Components Corp Thermal fuse with current fuse function
JP2004152518A (en) * 2002-10-29 2004-05-27 Matsushita Electric Ind Co Ltd Circuit protective element and method for manufacturing same

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0335640A (en) * 1989-07-03 1991-02-15 Nippon Telegr & Teleph Corp <Ntt> Orthogonal modulator

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01287905A (en) * 1988-05-13 1989-11-20 Murata Mfg Co Ltd Inductance element and manufacture thereof
JPH0335640U (en) * 1989-08-18 1991-04-08
JPH05166454A (en) * 1991-12-11 1993-07-02 Hitachi Chem Co Ltd Chip type fuse
JPH0569847U (en) * 1992-02-27 1993-09-21 瓊章 顔 Circuit breaking element without chip types of end caps
JPH10283906A (en) * 1997-04-08 1998-10-23 Taiheiyo Seiko Kk Circuit connector serving also as fuse
JPH11273541A (en) * 1998-03-25 1999-10-08 Skk:Kk Fuse
JP2002343223A (en) * 2001-05-10 2002-11-29 Koa Corp Fuse element
JP2004014224A (en) * 2002-06-05 2004-01-15 Nec Schott Components Corp Thermal fuse with current fuse function
JP2004152518A (en) * 2002-10-29 2004-05-27 Matsushita Electric Ind Co Ltd Circuit protective element and method for manufacturing same

Cited By (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9694975B2 (en) 2009-04-10 2017-07-04 Symbotic, LLC Lift interface for storage and retrieval systems
US10239691B2 (en) 2009-04-10 2019-03-26 Symbotic, LLC Storage and retrieval system
US9096375B2 (en) 2009-04-10 2015-08-04 Symbotic, LLC Storage and retrieval system
US10207870B2 (en) 2009-04-10 2019-02-19 Symbotic, LLC Autonomous transports for storage and retrieval systems
US9321591B2 (en) 2009-04-10 2016-04-26 Symbotic, LLC Autonomous transports for storage and retrieval systems
US9771217B2 (en) 2009-04-10 2017-09-26 Symbotic, LLC Control system for storage and retrieval systems
US9725239B2 (en) 2009-04-10 2017-08-08 Symbotic, LLC Storage and retrieval system
US8919801B2 (en) 2010-12-15 2014-12-30 Symbotic, LLC Suspension system for autonomous transports
US9561905B2 (en) 2010-12-15 2017-02-07 Symbotic, LLC Autonomous transport vehicle
US9550225B2 (en) 2010-12-15 2017-01-24 Symbotic Llc Bot having high speed stability
US9499338B2 (en) 2010-12-15 2016-11-22 Symbotic, LLC Automated bot transfer arm drive system
US9423796B2 (en) 2010-12-15 2016-08-23 Symbotic Llc Bot having high speed stability
US9187244B2 (en) 2010-12-15 2015-11-17 Symbotic, LLC BOT payload alignment and sensing
US8965619B2 (en) 2010-12-15 2015-02-24 Symbotic, LLC Bot having high speed stability
US10414586B2 (en) 2010-12-15 2019-09-17 Symbotic, LLC Autonomous transport vehicle

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