JP6062905B2 - Surface mount fuse and structure including the same - Google Patents

Description

  The present invention relates to a surface mount fuse and a structure including the fuse. More specifically, the durability can be maximized by brazing the ceramic tube and the sealing electrode using a ceramic non-conductive member with excellent mechanical strength and a ceramic tube (ceramic tube). The present invention relates to a surface mount fuse that can be used stably even at a high voltage by improving time lag characteristics, and a structure including the fuse.

  Generally, a fuse is used in an electronic device (TV, computer, cassette player, small electronic device, etc.), and a fusible element is disconnected when an overvoltage is applied, so that a circuit and an electronic component are protected from the overvoltage. Protect.

  In the normal state, the fuse does not generate high heat even when the maximum rated voltage is applied, must not be blown (cut), and must be blown in the abnormal state. However, a strong time-lag characteristic is required so as not to be blown by a momentary large voltage such as a surge voltage.

  On the other hand, FIG. 10 is a sectional view showing the structure of a conventional fuse. Referring to FIG. 10, the fuse disclosed in Korean Patent Application Publication No. 1992-0007019 (published date: Apr. 28, 1992) has a built-in tube 6 into which a filament 2 is inserted and which has a bent portion 7 at the tip. Is advanced to the center of the glass tube 1 and the tip is meshed with the silicon clipper, and the erection tube 6 is restored to wire the filament 2 in the glass tube 1, and the filaments 2 at both ends of the glass tube 1 are moved. The step of laying the filament diagonally in the glass tube 1, the metal cap 3 with the solder 4 attached to the inside of the both ends of the glass tube 1, the soldering iron 9 is brought into contact with the inside of the glass tube 1 diagonally And the step of welding both ends of the filament 2 installed on the metal cap 3 to the metal cap 3.

  However, the conventional fuse has a problem in that durability is weak because a glass tube is used and bonding is performed by a soldering method. Further, since the solder is inserted into the glass tube, the filament cannot be formed long, and therefore there is a problem that sufficient time-lag characteristics that can be used at a high voltage are not provided.

Published Korean patent application KR1992-0007019A

  Therefore, the present invention has been derived in order to solve the above-mentioned problems, and an object of the present invention is to use a ceramic non-conductive member and a ceramic tube excellent in mechanical strength, and An object of the present invention is to provide a surface-mount fuse capable of maximizing durability by joining a tube and a sealing electrode with a brazing ring and a structure including the fuse.

  Another object of the present invention is to wind the fusible part of the fuse element on the outer peripheral surface of the non-conductive member so as to have a sufficient length and number of turns, thereby improving the time lag characteristic and stably even at a high voltage. It is an object of the present invention to provide a surface mount fuse that can be used and a structure including the fuse.

  Furthermore, an object of the present invention is to provide a surface mount fuse and a structure including the same that can further improve the wettability or bonding force of the brazing ring by forming a plating layer in a region where brazing is performed. .

  For this purpose, the surface mount fuse according to the present invention is housed in (1) a ceramic tube, (2) a pair of sealed electrodes provided at both ends of the ceramic tube, and (3) the ceramic tube. A fuse element that is electrically connected to the sealing electrode and includes a non-conductive member, terminal electrodes provided at both ends of the non-conductive member, and a fusible portion that is electrically connected to the terminal electrode; (4) A brazing ring for sealing between the ceramic tube and the sealing electrode, wherein the ceramic tube and the sealing electrode are joined by melting of the brazing ring.

  The brazing ring of the surface mount fuse according to the present invention is preferably made of an alloy containing copper (Cu), silver (Ag) and zinc (Zn).

  The brazing ring of the surface mount fuse according to the present invention is preferably characterized in that the outer surface is located on the same line as the outer surface of the ceramic tube, and the inner surface is extended inward from the inner surface of the ceramic tube tube. To do.

  In addition, the sealing electrode of the surface mount fuse according to the present invention preferably includes a connection portion that is inserted into the ceramic tube and protrudes inward so as to contact the fuse element, and a joint portion that is coupled to the brazing ring. It is characterized by.

  The brazing ring of the surface mount fuse according to the present invention preferably comprises an outer peripheral portion joined to the ceramic tube and an inner peripheral portion joined to an end portion of the fuse element.

  Preferably, it further includes a brazing member that melts between the connection portion and the terminal electrode of the surface mount fuse according to the present invention to join the connection portion and the terminal electrode.

  Preferably, at least one of the connection part, the joint part, and the terminal electrode of the fuse according to the present invention is made of nickel (Ni) or so as to improve the joining force and discharge characteristics due to melting of the brazing ring or brazing member. It further includes a plating layer containing titanium (Ti).

  Further, the structure including the surface mounting fuse according to the present invention includes (A) a substrate, (B) a solder ball formed on the substrate, and (C) a surface mounting fuse connected to the solder ball. The surface mount fuse includes: (1) a ceramic tube; (2) a sealed electrode provided at both ends of the ceramic tube and connected to the solder ball; and (3) housed in the ceramic tube and A fuse element that is electrically connected to the sealing electrode and includes a non-conductive member, terminal electrodes provided at both ends of the non-conductive member, and a fusible portion that is electrically connected to the terminal electrode; (4) a brazing ring for sealing between the ceramic tube and the sealing electrode, wherein the ceramic tube tube and the sealing electrode are joined by melting of the brazing ring. To.

  According to the surface-mount fuse and the structure including the same according to the present invention having the above-described configuration, the ceramic tube tube and the sealing electrode are used by using a non-conductive member and a ceramic tube tube made of a ceramic material having excellent mechanical strength. Since it joins by a brazing ring, there exists an effect that durability can be maximized.

  Further, according to the surface mount fuse and the structure including the fuse according to the present invention, the fusible portion of the fuse element is wound around the outer peripheral surface of the non-conductive member and formed with a sufficient length and number of turns, thereby providing a time lag characteristic. It is effective in that it can be used stably even at a high voltage.

  According to the surface mount fuse and the structure including the same according to the present invention, there is an effect that the wettability or bonding force of the brazing ring can be further improved by forming the plating layer in the region where brazing is performed.

It is sectional drawing which shows the fuse element for surface mounting by this invention. It is sectional drawing similar to FIG. 1a which shows another example. It is sectional drawing similar to FIG. 1a which shows another example. It is sectional drawing which shows 1st Embodiment of the surface mount fuse by this invention. 1 is an exploded cross-sectional view showing a first embodiment of a surface-mount fuse according to the present invention. It is sectional drawing which shows 2nd Embodiment of the surface mount fuse by this invention. It is sectional drawing which shows 3rd Embodiment of the surface mount fuse by this invention. It is sectional drawing which shows 4th Embodiment of the surface mount fuse by this invention. It is sectional drawing which shows 5th Embodiment of the fuse for surface mount by this invention. It is sectional drawing similar to FIG. 7a which shows the other example of 5th Embodiment. It is sectional drawing (S1) which shows one Embodiment of the manufacturing method of the surface mount fuse by this invention according to a step. It is sectional drawing (S2) which shows one Embodiment of the manufacturing method of the surface mount fuse by this invention according to a step. It is sectional drawing (S3) which shows one Embodiment of the manufacturing method of the surface mount fuse by this invention according to a step. It is sectional drawing (S4) which shows one Embodiment of the manufacturing method of the surface mount fuse by this invention according to a step. It is sectional drawing (S5-1) which shows one Embodiment of the manufacturing method of the surface mount fuse by this invention according to a step. It is sectional drawing (S5-2) which shows one Embodiment of the manufacturing method of the surface mount fuse by this invention according to a step. It is sectional drawing which shows a mode that the fuse by this invention is surface-mounted on a board | substrate. It is sectional drawing which shows the conventional fuse structure.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.
In the description of the present invention, when it is determined that a specific description related to a related known function or configuration may unnecessarily obscure the gist of the present invention, a detailed description thereof will be omitted. Moreover, the term mentioned later is a term defined in consideration of the function in this invention, and this may differ according to a user, an operator's intention, or a precedent. Therefore, the definition must be made based on the entire contents of this specification.

  1a to 1c are sectional views showing a surface mounting fuse according to the present invention, FIG. 2 is a sectional view showing a first embodiment of the surface mounting fuse according to the present invention, and FIG. 3 is a surface mounting according to the present invention. It is a disassembled sectional view which shows 1st Embodiment of the fuse for operation.

  As shown in FIGS. 1 a to 3, the surface mount fuse 100 according to the present invention generally includes a ceramic tube 120, a sealing electrode 130, a fuse element 110, and a brazing ring 150.

  Specifically, the surface mount fuse 100 according to the present invention includes (1) a ceramic tube 120 filled with an inert gas, and (2) a pair of sealed electrodes 130 provided at both ends of the ceramic tube 120, (3) The fuse element 110 housed in the ceramic tube 120 and electrically connected to the sealing electrode 130 and including a fusible portion; and (4) Brazing for sealing between the ceramic tube 120 and the sealing electrode 130. A ring 150 may be included.

  Referring to FIG. 1 a, the fuse element 110 according to the present invention is electrically connected to a non-conductive member 111, terminal electrodes 117 provided at both ends of the non-conductive member 111, and the terminal electrode 117. A fusion part 115 may be included.

  The non-conductive member 111 has a rod shape and may be made of a ceramic material such as an alumina material. In addition, the fusible portion 115 may be attached to the outer peripheral surface of the non-conductive member 111.

  The terminal electrode 117 may be made of a copper alloy material. The terminal electrode 117 is provided at both ends of the non-conductive member 111 and serves to electrically connect the sealing electrode 130 and the fuse element 110.

  The fusible portion 115 is preferably wound in a spiral direction on the outer peripheral surface of the non-conductive member. This is because, by forming the fusible part 115 longer than the fusible parts 115a and 115b of FIGS. 1b and 1c described later, the time-lag characteristic that is not blown by the surge voltage can be improved. This is because it can be used stably at a high voltage of 250 V or higher.

  The fusible portion 115 operates so as to be broken (disconnected) when an overcurrent is applied. The fusible part 115 is exemplified by copper, silver, a copper-silver alloy, nickel-copper, nickel-iron, an iron-based alloy containing copper, iron, chromium and nickel whose main components are silver-plated on the surface. can do.

  Referring to FIG. 1b, a fuse element 110a according to the present invention includes a hollow cylindrical non-conductive member 111, terminal electrodes 117 provided at both ends of the non-conductive member 111, and the terminal electrode 117. A fusible portion 115 a that is electrically connected and penetrates the inside of the non-conductive member 111 may be included.

Referring to FIG. 1 c, the fuse element 110 b according to the present invention includes a non-conductive member 111, terminal electrodes 117 provided at both ends of the non-conductive member 111, and outer peripheral surfaces of the non-conductive member 111. A fusible portion 115 attached in the length direction and electrically connected to the terminal electrode 117 may be included.
As described above, the fuse element 110a according to the present invention can be configured in various forms in consideration of the use and characteristics of the product.

  The ceramic tube 120 according to the present invention has a cylindrical shape and is made of a ceramic material. Sealing electrodes 130 are provided at both ends of the cylindrical ceramic tube 120, and are sealed by the sealing electrode 130. Further, both ends of the ceramic tube 120 are brazed with the sealing electrode 130.

The sealing electrode 130 is provided at both ends of the ceramic tube 120 as described above.
Further, the sealing electrode 130 may be made of a copper alloy. Examples of the sealing electrode 130 include a connection part 133 that is inserted into the ceramic tube 120 and protrudes inward so as to contact the fuse element 110, and a joint part 131 that is coupled to the brazing ring 150. it can.

  Since the connecting portion 133 protrudes inward from the sealing electrode 130, the sealing electrode 130 can be easily assembled with the brazing ring 150 or the ceramic tube tube 120, and the fuse element 110 in the ceramic tube tube 120 is crimped in the brazing process. This is because the electrical connection between the sealing electrode 130 and the connection portion 133 becomes excellent.

  The brazing ring 150 according to the present invention serves as a filler metal that melts between the ceramic tube 120 and the sealing electrode 130 as the base material and joins and seals the base materials. Examples of the brazing ring 150 include those made of an alloy containing copper (Cu), silver (Ag), and zinc (Zn).

  The brazing step is performed at a temperature not lower than the melting point of the brazing ring as the filler material and not higher than the melting point of the ceramic tube and the sealing electrode as the base material.

  In joining by brazing, wetting (a property indicating the degree of affinity between the filler metal and the base material) is an important factor. That is, if the wettability between the brazing ring and the ceramic tube tube and the sealing electrode is poor, the bonding cannot be performed. Therefore, the present invention uses a ceramic tube made of a ceramic material having excellent wettability instead of a conventional glass tube having poor wettability with a filler material as a tube for housing a fuse element. .

  The brazing by the brazing ring 150 is not only excellent in bonding strength but also vibrations because the brazing ring 150 melts and causes a capillary action on the surfaces of the ceramic tube 120 and the sealing electrode 130. There is an advantage that it has excellent impact resistance against.

  Meanwhile, the brazing ring 150 may have an outer surface 151 located on the same line as the outer surface of the ceramic tube 120 and an inner surface 152 extending from the inner surface of the ceramic tube 120.

  As described above, the fuse according to the present invention uses a ceramic tube tube made of a ceramic material having excellent mechanical strength, and the ceramic tube and the sealing electrode are joined by a brazing ring, so that the durability is remarkably increased and even at a high voltage. There is an advantage that it can be used stably.

FIG. 4 is a sectional view showing a second embodiment of the surface mount fuse according to the present invention.
Referring to FIG. 4, the surface mount fuse 100 a according to the present invention may further include a brazing member 160 that joins the connection part 133 and the terminal electrode 117.

  The brazing member 160 has a plate shape and can be exemplified by an alloy including copper (Cu), silver (Ag), and zinc (Zn). The brazing member 160 is melted between the connection portion 133 and the terminal electrode 117 to join the connection portion 133 and the terminal electrode 117 in the same manner as the brazing ring.

  Therefore, the fuse element 110 and the sealing electrode 130 are more firmly coupled by the brazing member 160, so that the durability of the fuse can be improved.

FIG. 5 is a sectional view showing a third embodiment of the surface mount fuse according to the present invention.
Referring to FIG. 5, the brazing ring 150a of the surge absorber 100b according to the present invention may be configured to simultaneously join the ceramic tube 120 and the fuse element 110.

  That is, the brazing ring 150a includes an outer peripheral portion 153 bonded to the end portion of the ceramic tube 120 and an end portion of the fuse element 110 (specifically, an inner peripheral portion 154 bonded to the terminal electrode 117). Can be.

  Therefore, the brazing ring 150a is preferably formed to be equal to or thicker than the thickness of the connection portion 133a. This is because the brazing ring 150a can be joined to the ceramic tube tube 120 and the terminal electrode 117 after melting only when the brazing ring 150a is formed thicker than the connecting portion 133a.

  In addition, it is preferable that the inner peripheral portion 154 of the brazing ring 150a is formed to extend further inward than the brazing ring of FIG. 2, and the outer peripheral portion 153 is formed to be narrower than the connecting portion of FIG.

  FIG. 6 is a sectional view showing a fourth embodiment of the surface mount fuse according to the present invention. Referring to FIG. 6, the surface mount fuse 100 c according to the present invention may further include a plating layer 180 to improve wettability with the base material of the brazing ring 150 or the brazing member 160.

  Specifically, the plating layer (180: 181, 183, 185) is formed on at least one of the connection part 133, the joint part 131, and the terminal electrode 117, and is joined by melting the brazing ring 150 or the brazing member 160. Play a role to improve power.

The plating layer 180 preferably contains nickel (Ni) or titanium (Ti), and examples thereof include those made of a compound such as Ni ₃ P.

  7a and 7b are cross-sectional views showing a fifth embodiment of the surface mount fuse according to the present invention. Referring to FIGS. 7a and 7b, the sealing electrode 130b according to the present invention may be formed in a flat plate shape in which the connection portion does not protrude inward, unlike the sealing electrode of FIGS.

  The brazing ring 150b may be formed in a flat plate shape so that the end of the ceramic tube 120 and the terminal electrode 117 can be joined simultaneously (see FIG. 7a).

  The brazing ring 150c may be formed in a ring shape with a hollow central region so that the sealing electrode 130 and the terminal electrode 117 are directly connected (see FIG. 7b).

  Hereinafter, a method for manufacturing a surface mount fuse according to the present invention will be described in detail with reference to the accompanying drawings. 8a to 8f are cross-sectional views showing one embodiment of a method of manufacturing a surface mount fuse according to the present invention.

  In the method of manufacturing the surface mount fuse 100 according to the present invention, as described above, the surface mount fuse 100 includes (1) the ceramic tube 120 in which the fuse element 110 is housed, and (2) both ends of the ceramic tube 120. And first and second sealing electrodes 130 and 135 that are inserted in the respective portions and connected to the fuse element 110, and (3) first and second sealing members that join the ceramic tube 120 and the first and second sealing electrodes 130 and 135, respectively. Brazing rings 150, 155 may be included.

  Referring to FIG. 8a, step S1 includes a first sealing electrode 130. The first sealing electrode 130 is inserted into the ceramic tube 120 and protrudes inward so as to contact the fuse element 110. Connecting portion 133 to be connected to the first brazing ring 150.

  Next, referring to FIG. 8 b, the step S <b> 2 is a step of sequentially laminating the first brazing ring 150 and the ceramic tube tube 120 on the first sealing electrode 130.

The first brazing ring 150 is inserted into the connection part 133 of the first sealing electrode 130, and the ceramic tube 120 is placed on the first brazing ring 150.
Next, referring to FIG. 8 c, step S 3 is a step of inserting the fuse element 110 into the ceramic tube 120.

  Here, the fuse element 110 is electrically connected to a non-conductive member 111, first and second terminal electrodes 117 and 117a provided at both ends of the non-conductive member 111, and the first and second terminal electrodes 117 and 117a. A fusible portion 115 may be included.

  The first terminal electrode 117 of the inserted fuse element 110 is placed on the upper surface of the connection part 133 of the first sealing electrode 130. There may be a gap (G) or gap between the inner surface of the first terminal electrode 117 and the non-conductive member 111. The gap or gap is due to the coupling of a second sealing electrode to be described later. It will disappear through the crimping and brazing process of step S5. Such a gap or interval may occur naturally in the process of assembling the fuse element, or may be artificially formed.

  Next, referring to FIG. 8 d, step S 4 is a step of sequentially laminating the second brazing ring 155 and the second sealing electrode 135 on the ceramic tube 120. Assembling of the unbrazed fuse is performed through the steps S1 to S4.

  Next, in step S5, the surface mounting fuse 100 having undergone the steps S1 to S4 is placed in the chamber C, the first and second brazing rings 150 and 155 are melted, and the ceramic tube tube 120 and the first, This is a step of sealing between the two sealed electrodes 130 and 135.

  The step S5 can be performed in a state where the inside of the chamber is made an inert gas atmosphere, and the sealed ceramic tube 120 is filled with an inert gas. Further, since the inert gas is filled, the fuse element can be prevented from being oxidized, and the durability can be further improved.

  The surface mounting fuse 100 is put into the chamber C in a vertical state (see FIG. 8e), and the inside of the chamber C is heated to melt and bond the first and second brazing rings 150 and 155. (See FIG. 8f).

At this time, in the chamber C, the first and second sealed electrodes 130 and 135 and the ceramic tube 120 as the base material must be heated to a temperature below the melting point so that the base material is not deformed. Depending on the material of the two brazing rings, the heating temperature can be set within a range of 500 to 850 ° C, for example. For example, the first and second brazing rings 150 and 155 are alloys having a liquidus point of less than 800 ° C. including copper and silver (for example, Ag25Cu; Ag ₂₅ Cu ₄₀ Zn ₃₃ Sn ₂ ; solid phase point 680 to 690 ° C., liquid phase 760-780 ° C, for example, “BAg-37” from Ningbo Hemudu Brazing & Soldering Materials Co., Ltd.) can be heated at a temperature of 800-850 ° C. It is preferable to use a material that is not melted after the brazing treatment, for example, a nickel-copper alloy or a nickel-iron alloy.

Further, the first and second brazing ring 150, 155 is silver, copper, zinc and alloys of the liquid phase point of less than 650 ° C. consisting of tin (e.g. _{Ag56CuZnSn; Ag 56 Cu 19 Zn 17} Sn 5 Ga 3; solid phase point of about 610 ° C., liquidus point of about 630 ° C. For example, in the case of Umicore Technical Materials North America Inc. “BrazeTec 5662”), brazing is performed at a temperature of 600 to 650 ° C. Needless to say, nickel-iron alloys and the like, copper, silver, and silver-copper alloys that are fused at 800 to 850 ° C. can also be used.

  That is, by lowering the brazing temperature at which the first and second brazing rings 150 and 155 are melted from 800 to 850 ° C. to 600 to 650 ° C., copper, silver, and silver that have been the main components of the conventional fusible part -Since a copper alloy or the like can be used as it is, the selection range can be widened when designing a fuse. Moreover, even if the fusible part is not melted at 800 ° C. or higher, the quality can be affected by high heat and the brazing is performed at a relatively low temperature (600 to 650 ° C.). The problem of quality degradation (ie, at least one of these) can be minimized.

  In addition, the heated first and second brazing rings 150 and 155 are melted to seal and join the surface of the base material by capillary action, and the thickness thereof is reduced.

  On the other hand, FIG. 9 is a cross-sectional view showing a state where the surface mounting fuse according to the present invention is surface mounted on a substrate. Referring to FIG. 9, the surface mount fuse 100a of the present invention can be used as a surface mount device (SMD) by connecting a sealing electrode 130 and a solder ball.

  Thus, in the fuse manufacturing method according to the present invention, the ceramic tube tube made of a ceramic material having excellent mechanical strength is used, and the ceramic tube tube and the sealing electrode are bonded by the brazing ring, so that the bonding strength and durability are excellent.

  Further, by winding the fusible portion on the outer peripheral surface of the non-conductive member, it is possible to improve the time lag characteristic so that it can be used even at a high voltage. In addition, by reducing the brazing to a temperature of 600 to 650 ° C., there is an advantage that even if a conventional fusible part material is used as it is, it is not blown out.

  As described above, the fuse manufacturing method of the present invention can improve durability through brazing and can manufacture a fuse that can be used stably even at a high voltage of 250 V or higher.

  On the other hand, in the detailed description of the present invention and the accompanying drawings, specific embodiments have been described. However, the present invention is not limited to the disclosed embodiments, and those having ordinary knowledge in the technical field to which the present invention belongs. If so, various replacements, modifications and changes can be made without departing from the technical idea of the present invention. Therefore, the scope of the present invention should not be limited to the described embodiments, and should be interpreted as including not only the scope of claims described below but also equivalents of the scope of claims. Will.

100: fuse; 110: fuse element;
111 ... Non-conductive member; 115 ... Discharge gap;
117 ... Terminal electrode; 120 ... Ceramic tube;
DESCRIPTION OF SYMBOLS 130 ... Sealing electrode; 131 ... Joint part; 133 ... Connection part 150 ... Brazing ring; 151 ... Outer surface;
152 ... inner surface; 153 ... outer periphery; 154 ... inner periphery;
160 ... brazing member; 180 ... plating layer;
181 ... Junction plating layer; 183 ... Connection plating layer;
185 ... Terminal electrode plating layer

Claims (8)

Ceramic tube,
A pair of sealed electrodes provided at both ends of the ceramic tube;
Housed in the ceramic tube and electrically connected to the sealing electrode, a non-conductive member, terminal electrodes provided at both ends of the non-conductive member, and electrically connected to the terminal electrode A fuse element including a fusion part;
A brazing ring for sealing between the ceramic tube and the sealing electrode;
Between the ceramic tube and the sealing electrode, a welded part by the brazing ring is formed to join them together,
The surface-mounting fuse is characterized in that the sealing electrode includes a connection portion that is inserted into a ceramic tube and protrudes inward so as to contact the fuse element, and a joint portion that is coupled to the brazing ring. Ceramic tube,
A pair of sealed electrodes provided at both ends of the ceramic tube;
Housed in the ceramic tube and electrically connected to the sealing electrode, a non-conductive member, terminal electrodes provided at both ends of the non-conductive member, and electrically connected to the terminal electrode A fuse element including a fusion part;
A brazing ring for sealing between the ceramic tube and the sealing electrode;
Between the ceramic tube and the sealing electrode, a welded part by the brazing ring is formed to join them together,
The surface-mounting fuse according to claim 1, wherein the brazing ring includes an outer peripheral portion joined to the ceramic tube and an inner peripheral portion joined to an end portion of the fuse element.     The surface-mount fuse according to claim 1, further comprising a brazing member that melts between the connection portion and the terminal electrode to join the connection portion and the terminal electrode.     At least one of the connection part, the joint part, and the terminal electrode is further provided with a plating layer containing nickel (Ni) or titanium (Ti) so as to improve a joining force by melting the brazing ring or the brazing member. The surface-mount fuse according to claim 3, wherein the surface-mount fuse is included.     The surface mounting fuse according to claim 1, wherein the brazing ring is made of an alloy containing copper (Cu), silver (Ag), and zinc (Zn).     5. The brazing ring according to claim 1, wherein an outer surface of the brazing ring is located on the same line as an outer surface of the ceramic tube tube, and an inner surface is formed to extend inward from the inner surface of the ceramic tube tube. The listed surface mount fuse. A substrate,
A solder ball formed on the substrate, and a surface mount fuse connected to the solder ball,
The surface mount fuse is:
Ceramic tube,
Sealed electrodes provided at both ends of the ceramic tube and connected to the solder balls;
Housed in the ceramic tube and electrically connected to the sealing electrode, a non-conductive member, terminal electrodes provided at both ends of the non-conductive member, and electrically connected to the terminal electrode A fuse element including a fusion part;
A brazing ring for sealing between the ceramic tube and the sealing electrode;
Between the ceramic tube and the sealing electrode, a welded part by the brazing ring is formed to join them together,
The surface-mount fuse structure , wherein the sealing electrode includes a connecting portion that is inserted into a ceramic tube and protrudes inward so as to contact the fuse element, and a joint portion that is coupled to the brazing ring. A substrate,
A solder ball formed on the substrate, and a surface mount fuse connected to the solder ball,
The surface mount fuse is:
Ceramic tube,
Sealed electrodes provided at both ends of the ceramic tube and connected to the solder balls;
Housed in the ceramic tube and electrically connected to the sealing electrode, a non-conductive member, terminal electrodes provided at both ends of the non-conductive member, and electrically connected to the terminal electrode A fuse element including a fusion part;
A brazing ring for sealing between the ceramic tube and the sealing electrode;
Between the ceramic tube and the sealing electrode, a welded part by the brazing ring is formed to join them together,
The structure of a surface mount fuse , wherein the brazing ring includes an outer peripheral portion joined to the ceramic tube and an inner peripheral portion joined to an end portion of the fuse element.

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