CN105900207B - Switch element, switching circuit and circuit for alarming - Google Patents

Abstract

A kind of switch element provided by the invention has: fusible conductor is connected to the 1st electrode of the one end of fusible conductor, is connected to the 2nd electrode of the other end of fusible conductor, and the refractory metal body with the high fusing point of the fusing point than fusible conductor.

Description

Switch element, switching circuit and circuit for alarming

Technical field

This technology is related to a kind of switch element, switching circuit and circuit for alarming more particularly to a kind of energy using them Enough seek to minimize, and the switch element, switching circuit and use of driving circuit can be fitted easily in by surface installation Their circuit for alarming.

Background technique

As the switch element of starting alarm device, generally use alarm with fuse (referring to patent document 1).It is used as alarm An example of fuse is provided with a pair of of alarm contact 101 and 102 in fuse holder 100, makes alarm as shown in fig. 15 a and fig. 15b The fuse 104 of spring 103 and holding spring 103 that contact 101 and 102 contacts.A pair of of alarm contact 101,102 and starting The circuit for alarming 105 of alarm device connects and usually by apart from one another by configuration.Fuse 104 is in the position being spaced with alarm contact 102 Upper bias spring 103.

Alarm contact 101,102 is by contacting with each other starting circuit for alarming 105.The alarm contact 101,102 is by with bullet Property the conductive materials such as leaf spring formed and by configuration close to each other.The starting of the progress warning system of circuit for alarming 105.The alarm system The starting of system is such as the driving of the starting of buzzer or lamp, thyristor or relay circuit.

Spring 103 by fuse 104 with the state of biasing be maintained at on the position at 102 interval of alarm contact.Then, because Spring 103 restores elasticity since fuse 104 fuses, so pressing alarm contact 102 makes the alarm contact 102 and alarm contact 101 contacts.

Fuse 104 keeps spring 103 with the state of flexible deformation, and by utilizing and flowing into the specified of the fuse 104 The more than electric current corresponding self-heating of overcurrent and fuse, open spring 103.

Existing technical literature

Patent document

Patent document 1: Japanese Unexamined Patent Publication 2001-76610 bulletin

Summary of the invention

In above-mentioned alarm fuse, spring 103 is kept with the state of flexible deformation using fuse 104.In addition, by making Fuse 104 fusing, discharge the stress of the spring 103, and physically press alarm contact 102, make alarm contact 101 and 102 it Between occur short circuit.In such alarm fuse, because starting circuit for alarming due to the physics gearing using element, It must assure that the movable range of alarm contact 101,102 and spring 103, so the structure of alarm fuse will become larger.Therefore, exist It will be become difficult in the circuit of miniaturization using above-mentioned fuse.In addition, production cost is also got higher.

In addition, because in order to make short circuit between alarm contact 101,102 be necessary that fuse 104 is made to fuse, if Not continuing through over proof electric current makes fuse 104 fuse, then is difficult to start circuit for alarming.

Further more, in above-mentioned alarm fuse, by keeping the alarm contact 101,102 when normal in open state short Road starts circuit for alarming.Thus, for example, for the alarm for extinguishing the indicator light lighted when normal when abnormal etc. Movement, cannot use above-mentioned fuse.

Accordingly, it is desired to provide a kind of cut off the external circuits, the physics not against element such as circuit for alarming when abnormal It interlocks and seeks to minimize and quickly make the switch element and switching circuit that stop the power supply of circuit, while one kind being provided Use their circuit for alarming.

To solve the above-mentioned problems, a kind of switch element of embodiment of this technology has: fusible conductor, be connected to can Melt the 1st electrode of the one end of conductor, the 2nd electrode of the other end for being connected to fusible conductor and with than fusible conductor The high fusing point of fusing point refractory metal body.

In addition, a kind of switching circuit of embodiment of this technology has switch portion and the 2nd fuse.The switch portion includes logical It crosses the 1st fuse to be connected with each other and the 1st electrode connect with external circuit and the 2nd electrode, passes through and cut off the 1st electrode and the 2nd electrode Between energization stop the power supply to external circuit.2nd fuse has the fusing point higher than the fusing point of the 1st fuse, and with opening The electrically independent functional circuit connection in pass portion.

In addition, a kind of circuit for alarming of embodiment of this technology has driving circuit, the 2nd fuse and control circuit.It should Driving circuit include by the 1st fuse the 1st electrode interconnected and the 2nd electrode, by the 1st electrode of cutting and the 2nd electrode it Between energization and stop the power supply to alarm device.2nd fuse is electrically independent with driving circuit, has higher than the fusing point of the 1st fuse Fusing point.The functional circuit that there is the control circuit the 2nd fuse to be series at power supply.

According to switch element, switching circuit or the circuit for alarming of a kind of embodiment of this technology, because not using bullet In addition the elements such as spring and alarm contact can constitute switch element not against the physics gearing of element, so In the face of insulating substrate, can small design switch element, and switch element can be also installed in the installation region of miniaturization.

In addition, because the circuit for making refractory metal body generate heat and the circuit for being equipped with fusible conductor are electrically independent, and benefit Fusible conductor is set to fuse with the fever of refractory metal body, so detection can also be passed through by not needing the fusing of refractory metal body Out abnormal overcurrent and make circuit start, and be also able to suppress the influence of the noise generated when the fusing of refractory metal body.

In addition, by Reflow Soldering install etc. can surface insulating substrate is installed, and also can in the installation region of miniaturization It is enough simply to be installed.

Detailed description of the invention

Figure 1A is the plan view for indicating the state before the starting of the switch element of embodiment of this technology a kind of；

Figure 1B is the sectional view along A-A' line of switch element shown in Figure 1A；

Fig. 1 C is the circuit diagram of switch element shown in Figure 1A；

Fig. 2A is to indicate that refractory metal body generates heat, the fused conductor fusing of fusible conductor, logical between the 1st, the 2nd electrode The plan view of the state for the switch element being electrically cut off；

Fig. 2 B is the sectional view along A-A' line of switch element shown in Fig. 2A；

Fig. 2 C is the circuit diagram of switch element shown in Fig. 2A；

Fig. 3 A is the plan view for indicating the state of switch element of refractory metal body fusing；

Fig. 3 B is the sectional view along A-A' line of switch element shown in Fig. 3 A；

Fig. 3 C is the circuit diagram of switch element shown in Fig. 3 A；

Fig. 4 is the circuit diagram for indicating circuit for alarming；

Fig. 5 A is the plan view for indicating refractory metal body and the 1st electrode switch element interconnected；

Fig. 5 B is the sectional view along A-A' line of switch element shown in Fig. 5 A；

Fig. 5 C is the circuit diagram of switch element shown in Fig. 5 A；

Fig. 6 is the sectional view for indicating to be formed with the switch element of cover electrode on lid part；

Fig. 7 A is to indicate that refractory metal body and the 1st electrode and fusible conductor are overlapped on the surface of insulating substrate The plan view of switch element；

Fig. 7 B is the sectional view along A-A' line of switch element shown in Fig. 7 A；

Fig. 8 A is to indicate that refractory metal body is formed on the back side of insulating substrate, is formed in the of the insulating substrate surface The plan view of 1 electrode and fusible conductor and the overlapped switch element of refractory metal body；

Fig. 8 B is the sectional view along A-A' line of switch element shown in Fig. 8 A；

Fig. 9 A be indicate the coating construction for having containing high melting point metal layer and low-melting-point metal layer fusible conductor it is vertical Body figure indicates the situation that using high melting point metal layer as internal layer and the high melting point metal layer is coated by low-melting-point metal layer；

Fig. 9 B be indicate the coating construction for having containing high melting point metal layer and low-melting-point metal layer fusible conductor it is vertical Body figure indicates the situation that using low-melting-point metal layer as internal layer and the low-melting-point metal layer is coated by high melting point metal layer；

Figure 10 A is the solid for indicating the fusible conductor that there is the lamination of high melting point metal layer and low-melting-point metal layer to construct Figure, indicates that the fusible conductor has the case where 2 layers of construction；

Figure 10 B is the solid for indicating the fusible conductor that there is the lamination of high melting point metal layer and low-melting-point metal layer to construct Figure, indicates that the fusible conductor has the case where 3 layers of construction being made of internal layer and 2 outer layers；

Figure 11 is the sectional view for indicating to have the fusible conductor of the multi-ply construction of high melting point metal layer and low-melting-point metal layer；

Figure 12 A is to indicate that being formed with linear opening portion, low-melting-point metal layer on the surface of high melting point metal layer opens at this The case where plan view for the fusible conductor that oral area exposes, expression is alongst formed with opening portion；

Figure 12 B is to indicate that being formed with linear opening portion, low-melting-point metal layer on the surface of high melting point metal layer opens at this The case where plan view for the fusible conductor that oral area exposes, expression is formed with opening portion along width direction；

Figure 13 is to indicate to be formed with circular opening portion on the surface of high melting point metal layer, and low-melting-point metal layer is in the opening The plan view for the fusible conductor that portion exposes；

Figure 14 is to indicate to be formed with circular opening portion on high melting point metal layer, is filled in the inside of the opening portion low The plan view of the fusible conductor of melting point metal layer；

Figure 15 A is the sectional view of the state before the starting of an example for indicating alarm elements；

Figure 15 B is the sectional view of the state after the starting of an example for indicating alarm elements.

Specific embodiment

The switch element, switching circuit and circuit for alarming of a kind of embodiment of this technology are carried out referring to the drawings detailed It describes in detail bright.In addition, this technology is not limited solely to the following embodiments and the accompanying drawings, in the range of not departing from the purport of this technology, certainly may be used To be made various changes to this technology.In addition, attached drawing is that schematically, the ratio etc. of each size is possible to and the thing phase of reality It is different.Specific size etc. should consider according to the following description, judge.In addition, among the figures certainly comprising mutual size The relationship part different with ratio.

As shown in Figure 1A~Fig. 1 C, a kind of switch element of embodiment of this technology has: insulating substrate 10 is formed in The 1st electrode 11 and the 2nd electrode 12 on insulating substrate 10, the fusible conductor 13 for being connected to the 1st electrode 11 and the 2nd electrode 12, with And the refractory metal body 15 with the fusing point higher than the fusing point of fusible conductor 13 of formation on the insulating substrate 10.In addition, figure 1A is the plan view for removing the switch element 1 of lid part 20, and Figure 1B is the switch element 1 shown in Figure 1A along A-A' line Sectional view, Fig. 1 C is the circuit diagram of switch element 1.

Switch element 1 passes through the alarm that the 1st electrode 11 and the 2nd 12 at electrode and is made of buzzer, lamp or warning system etc. Device 31 (aftermentioned Fig. 4) connection.The switch element 1 passes through using more than the rated current with inflow refractory metal body 15 Overcurrent and the heat occurred make the energization between the melting of fusible conductor 13, the 1st electrode 11 of cutting and the 2nd electrode 12, to stop Only to the power supply of alarm device 31, make indicator light extinguishing etc..In addition, switch element 1 is being cut off between the 1st electrode 11, the 2nd electrode 12 Energization after, by make refractory metal body 15 fuse and make fever stop.

[insulating substrate]

The insulating material such as using aluminium oxide, glass ceramics, mullite, zirconium oxide of insulating substrate 10 is formed.It is opening It closes in element 1, because by insulating substrate 10, the heat that refractory metal body 15 occurs is sent to the 1st electrode the 11, the 2nd Electrode 12 and fusible conductor 13, so the insulating substrate 10 is preferably by excellent heat resistance and the high material of thermal conductivity, for example ceramic The formation such as substrate.Although in addition, insulating substrate 10 in addition to this can also be by for the printing such as glass epoxy substrate, phenol substrate The material of wiring substrate is formed, it should be noted that the temperature when fusing of refractory metal body 15 and fusible conductor 13.

[the 1st, the 2nd electrode]

1st electrode 11, the 2nd electrode 12 are on the surface 10a of insulating substrate 10, by oppositely disposed and separate.In addition, the 1st The front end 12b of the front end 11b of electrode 11 and the 2nd electrode 12 is opposite, and the front end 11b, 12b are connected with aftermentioned fusible lead Body 13.Specifically, the front end 11b of the 1st electrode 11 is overlapped on the one end of fusible conductor 13, with the fusible conductor 13 One end connection.In addition, the front end 12b of the 2nd electrode 12 is overlapped on the other end of fusible conductor 13, with the fusible conductor 13 the other end connection.1st electrode 11, the 2nd electrode 12 are electrically connected by fusible conductor 13, if with refractory metal body 15 energization and generate heat, then because be heated using the heat fusible conductor 13, the fusible conductor 13 fusing.

In addition, the 1st electrode 11, the 2nd electrode 12 are heated by refractory metal body 15, it can easily be aggregated fusible lead The fusant (fused conductor) of body 13.

1st electrode 11 has external connection terminals 11a in the side 10b of insulating substrate 10, and the 2nd electrode 12 is insulating The side 10c of substrate 10 has external connection terminals 12a.1st electrode 11, the 2nd electrode 12 pass through external connection terminals 11a, 12a It is connect with alarm device 31 often, the power supply by the starting cutting of switch element 1 to the alarm device 31.

1st electrode 11 and the 2nd electrode 12 are by least containing one of copper (Cu) and silver-colored (Ag) etc. as its constitution element General electrode material, such as refractory metal formed.1st electrode 11, the 2nd electrode 12 be respectively using with aftermentioned Gao Rong The point same method of metallic object 15 carries out the electrode pattern of patterning formation.In addition, on the surface of the 1st electrode 11, the 2nd electrode 12 On, it is preferable to use electroplating processes etc. for the coating containing nickel (Ni)/gold (Au) plating, Ni/ palladium (Pd) plating, Ni/Pd/Au plating etc. Known method coating.Therefore, in switch element 1, the oxidation of the 1st electrode 11, the 2nd electrode 12 can be prevented, and can Reliably keep the fused conductor of the 1st electrode 11, fusible conductor 13 on the 2nd electrode 12.In addition, being switched being installed with Reflow Soldering When element 1, it can prevent because for making the connection solder of the connection of fusible conductor 13 or being used to form outside fusible conductor 13 The low melting point metal of layer melts and makes the 1st electrode 11, the 2nd electrode 12 by corrode (solder leaching).

[refractory metal body]

Refractory metal body 15 is by for example, at least containing tungsten (W), molybdenum (Mo), ruthenium once the conductive material to generate heat that is powered (Ru), one of Cu and Ag etc. is formed as the refractory metal of its constitution element, which is also possible to alloy. Refractory metal body 15 is that these alloys or composition, the coccoid of compound and resin binder etc. are mixed into conductive paste, And using screen printing technique by the conductive paste patterning after, pass through calcining etc. formation electrode pattern.

Refractory metal body 15 and the 1st electrode 11, the 2nd electrode 12 configure on the surface 10a of insulating substrate 10 side by side.Cause If this refractory metal body 15 generates heat with being powered, can make to configure fusible on the 1st electrode 11, the 2nd electrode 12 Conductor 13 melts.

In addition, refractory metal body 15 is respectively provided with external connection terminals 15a in side 10b, 10c of insulating substrate 10. Refractory metal body 15 is connect by external connection terminals 15a with the functional circuit 32 that alarm device 31 starts is triggered, by corresponding 32 exception of accompaniment functions circuit is more than the overcurrent of rated current and generates heat and generate high temperature, and fusible conductor 13 is made to fuse.For example, Refractory metal body 15 can be using the Electric Design for reaching 300 DEG C or so of being generated heat by the electric power for applying 20W~30W.

In addition, in refractory metal body 15, with partially attenuate on 13 close position of fusible conductor, in the high-melting-point It is formed on the position that 15 part of metallic object attenuates due to current convergence and the heating part 15b of local pyrexia generation high temperature.Pass through Fusible conductor 13 can effectively be made with setting heating part 15b, refractory metal body 15 on 13 close position of fusible conductor Melting, while the energization between the 1st electrode 11, the 2nd electrode 12 can quickly be made to cut off.

In addition, in switch element 1, with a side close position such as Figure 1A~figure in the 1st electrode 11, the 2nd electrode 12 Shown in 1C, be connected to fusible conductor 13 the 1st electrode 11 in the front end close position 11b on, be preferably formed as Gao Rong The heating part 15b of point metallic object 15.By be connected to fusible conductor 13 the 1st electrode 11 in front end 11b it is close Heating part 15b is set on position, and refractory metal body 15 effectively can be passed heat by insulating substrate 10 and front end 11b It send to fusible conductor 13 and makes its melting, while the energization between the 1st electrode 11, the 2nd electrode 12 can quickly be made to cut off.

In addition, front end 11b in the 1st electrode 11 for being connected to fusible conductor 13 and being connected to fusible conductor 13 The 2nd electrode 12 in front end 12b in, preferred area ratio another party of the front end of a side close with heating part 15b The area of front end is big, and the electrode of the front end with a side is kept more than the electrode of the front end with the another party More fusible conductors 13.As shown in Figure 1A~Fig. 1 C, in switch element 1, the heating part 15b that makes refractory metal body 15 with When the front end 11b of 1st electrode 11 is close, before the front end 12b preferably than the 2nd electrode 12 larger forms the 1st electrode 11 End 11b, and make fusible conductor 13 in a wide range of interior connection by the front end 11b of the 1st electrode 11.

Because the front end 11b and heating part 15b of the 1st electrode 11 are close, can forward end 11b more transmit Heat from refractory metal body 15, so as to effectively melt fusible conductor 13.Therefore, the is expanded by opposite The area of the front end 11b of 1 electrode 11 and more fusible conductors 13 are maintained on the 1st electrode 11, so can be more Fusible conductor 13 is transferred heat to fastly and is melted it while can be made the energization between the 1st electrode 11, the 2nd electrode 12 Cutting.

In addition, the front end 11b of the 1st electrode 11 with heating part 15b because by approaching and forming relatively large face Product, can be heated to higher temperature, so being able to maintain the major part of the fusible conductor 13 of melting.

As shown in Figure 1A~Fig. 1 C, in refractory metal body 15, when functional circuit 32 works normally, then flow into specified Interior electric current appropriate.However, in refractory metal body 15, due to functional circuit 32 exception and flow into more than rated current Overcurrent when, then because the refractory metal body 15 fever generates high temperature, as shown in Fig. 2A~Fig. 2 C, fusible conductor 13 is molten It is disconnected, while the energization between the 1st electrode 11, the 2nd electrode 12 is cut off.Later, due to 15 persistent fever of refractory metal body, such as Shown in Fig. 3 A~Fig. 3 C, refractory metal body 15 is also fused using the self-heating (Joule heat) of itself.Therefore, because function Overcurrent caused by the exception of circuit 32 is cut off, functional circuit 32 is cut off simultaneously, so refractory metal body 15 stops The fever of itself.That is, refractory metal body 15 is used as while melting fusible conductor 13, using self-heating Cut off the fuse of the supply path of itself.

In addition, becoming the heating part 15b of high temperature, high-melting-point gold by being provided with part in refractory metal body 15 Belong to body 15 to fuse at heating part 15b.At this moment, in refractory metal body 15, because of the hair to attenuate due to foring part Hot portion 15b, the arc discharge that when fusing occurs also stays on small-scale, while can also obtain the quilt of aftermentioned insulating layer 16 Effect is covered, so dispersing for fused conductor can be prevented.

In addition, in order to form refractory metal body 15, other than above-mentioned use print process etc. patterns conductive paste, The refractory metals lines such as refractory metals foil or copper wire, silver wire such as copper foil, silver foil can be used to form refractory metal body 15. In addition, when forming refractory metal body 15 using refractory metal foil or refractory metal line, as insulating substrate 10, such as Fruit is excellent using thermal conductivity and can make the ceramic substrate of 13 Flashmelt of fusible conductor, then with phase the case where using conductive paste Than the leakage problem of the fused conductor after the fusing of refractory metal body 15 also tails off.

[insulating layer]

1st electrode 11, the 2nd electrode 12 and refractory metal body 15 are on the surface 10a of insulating substrate 10 by insulating layer 16 It is coating.Insulating layer 16 is in order in the same of the protection and insulation for seeking the 1st electrode 11, the 2nd electrode 12 and refractory metal body 15 When, inhibit the arc discharge when fusing of refractory metal body 15 and be arranged, such as includes glass etc..

As shown in Figure 1A~Fig. 1 C, Fig. 2A~Fig. 2 C and Fig. 3 A~Fig. 3 C, insulating layer 16 covers refractory metal body 15 Heating part 15b, and be formed in addition to the 1st electrode 11, the 2nd electrode 12 front end 11b, 12b other than region.That is, In the 1st electrode 11, the 2nd electrode 12, because front end 11b, 12b are not coated by insulating layer 16 and are exposed, in the front end It can connect aftermentioned fusible conductor 13 on portion 11b, 12b.

In addition, because by insulating layer 16 be formed in addition to the 1st electrode 11, the 2nd electrode 12 front end 11b, 12b other than Region, thus when the heat that refractory metal body 15 is occurred is sent to front end 11b, 12b by insulating substrate 10, it can The heat is prevented to be released, so front end 11b, 12b can effectively heat and transfer heat to fusible conductor 13.Separately Outside, exhausted by being arranged between front end 11b, 12b and external connecting electrode 11a, 12a in the 1st electrode 11, the 2nd electrode 12 Edge layer 16 can prevent the fusible conductor 13 due to melting from flowing out from the side external connecting electrode 11a, 12a and be used in connection peace The state of affairs of the melt solder of circuit substrate equipped with switch element 1 occurs.

In addition, can also be formed between refractory metal body 15 and insulating substrate 10 in switch element 1 and contain glass Deng insulating layer 16.Therefore, in switch element 1, by prevent due to refractory metal body 15 fuse after fused conductor exhausted The attachment on 10 surface of edge substrate and the leakage generated, can be improved insulation resistance.Furtherly, by will be in refractory metal The insulating layer 16 formed between body 15 and insulating substrate 10 only partially configures the immediate vicinity in heating part 15b, just can be same When ensure to fusible conductor 13 conduct heat performance and cutting after insulation resistance.

[fusible conductor]

It is excellent as the forming material of the fusible conductor 13 by the configuration of insulating layer 16 on the 1st electrode 11, the 2nd electrode 12 Any metal (low-melting-point metal) of the choosing using the fever using refractory metal body 15 and by Flashmelt.The low-melting-point metal E.g. solder or with the Pb solder etc. as main component not melted when 260 DEG C of Reflow Solderings are installed.

In addition, fusible conductor 13 can also contain low-melting-point metal and refractory metal.As low-melting-point metal, preferably make With solder or with Sn lead-free solder as main component etc..As refractory metal, it is preferable to use at least containing in Ag and Cu A kind of material as its constitution element, which is also possible to alloy etc..Since fusible conductor 13 contains Gao Rong Point metal and low-melting-point metal, when switch element 1 is installed in Reflow Soldering, because even since Reflow Soldering temperature is more than low melting point gold The melting temperature of category, low-melting-point metal melting, are also able to suppress low-melting-point metal and flow out to outside, so being able to maintain that fusible The shape of conductor 13.In addition, in fusing, because since low-melting-point metal melting, refractory metal are by corrode (solder leaching), So can be in the fusing point temperature quick fuse fusible conductor 13 below of refractory metal.In addition, fusible conductor 13 is as below It is described, it is capable of forming as various compositions.

In addition, fusible conductor 13 aoxidizes in order to prevent, improves wetability etc., preferred coating scaling powder 18.

[switching circuit circuit for alarming]

Switch element 1 as described above has circuit structure as shown in Figure 1 C.That is, in switch element 1, When normal, the 1st electrode 11 connect (Fig. 1 C) by fusible conductor 13 with the 2nd electrode 12, if utilizing refractory metal body 15 Fever melts fusible conductor 13, then the energization between the 1st electrode 11 and the 2nd electrode 12 is cut off (Fig. 2 C).

Then, switch element 1 is for example loaded into circuit for alarming 30 and uses.Fig. 4 is the circuit knot for indicating circuit for alarming 30 The figure of an example of structure.Circuit for alarming 30 has driving circuit 33 and control circuit 34.33 use of driving circuit is by switch element 1 Fusible conductor 13 constitute the 1st fuse 35 start alarm device 31.The control circuit 34 have with driving circuit 33 it is electrically independent and The functional circuit 32 of formation.In the functional circuit 32, by the high-melting-point gold with the fusing point higher than the fusing point of fusible conductor 13 Belong to the 2nd fuse 36 that body 15 is constituted to connect with power supply.

As shown in figure 4, in switch element 1, two external connection terminals 11a of the 1st fuse 35 (fusible conductor 13), 12a is connect with alarm devices 31 such as indicator lights, and alarm device 31 is energized when normal, and is powered is cut off when abnormal.In addition, In switch element 1, two external connection terminals 15a of the 2nd fuse 36 (refractory metal body 15) are connect with functional circuit 32.

In the switch element 1 having a structure in which, by utilizing the 11, the 2nd electricity of the 1st electrode with starting alarm device 31 The fever of the refractory metal body 15 of the adjacent connection in pole 12 make fusible conductor 13 melt, cutting the 1st electrode 11, the 2nd electrode 12 it Between energization.That is, refractory metal body 15 and the 1st electrode 11,12 physics of the 2nd electrode and electricity are solely in switch element 1 It is vertical, have the energization and heat occurred using refractory metal body 15 melts fusible conductor 13 cut-off (so-called Be thermally connected) serial verb construction.

Therefore, switch element 1 is not because without using the elements such as spring and alarm contact, in addition utilize element Physics gearing can be constituted, being capable of small design switch element 1 and in miniaturization so in the face of insulating substrate 10 Installation region also mountable switch element 1.In addition, because the component number and manufacturing process's number of switch element 1, institute can be cut down With it is possible to realize reduce cost.Furtherly, because using Reflow Soldering install etc. can surface install insulating substrate, The installation region of miniaturization can also be simply installed switch element 1.

In addition, switch element 1 because refractory metal body 15 and the 1st electrode 11, the 2nd electrode 12 physically and electrically independentlyly Constitute, so for example, to configured with as fuse refractory metal body 15 electric power system power source line and separated signal When system line signal an alert, it is able to suppress the influence of power supply noise when refractory metal body 15 fuses.Therefore, because not The circuit of noise suppression is needed, so the circuit for alarming of high reliablity can be constituted.

In actual use, in switch element 1, due to functional circuit 32 failure and make refractory metal body 15 flow into Over proof overcurrent.Therefore as shown in Figure 2 A, because if refractory metal body 15 generates heat, then pass through 10 He of insulating substrate 1st electrode 11, the 2nd electrode 12 front end 11b, 12b transfer heat to fusible conductor 13, so fusible conductor 13 melt. The fused conductor of fusible conductor 13 the 1st electrode 11, the 2nd electrode 12 that are heated by refractory metal body 15 front end 11b, It is aggregated on 12b.It therefore,, can because the energization between the 1st electrode 11, the 2nd electrode 12 is cut off in switch element 1 Make to stop (Fig. 2 C) to the energization of the alarm device 31 of driving circuit 33.In circuit for alarming 30, because by stopping to alarm device 31 are powered, such as extinguishing indicator light etc., so exception can be notified.

At this moment, in switch element 1, because due near the fusible conductor 13 in refractory metal body 15, setting There is the heating part 15b that is formed with attenuating of part, so that high-resistance heating part 15b becomes high temperature, so by the way that effectively make can Molten conductor 13 melts, and can rapidly make short-circuit between the 1st electrode 11, the 2nd electrode 12.In addition, in refractory metal body 15, Because only high-resistance heating part 15b locally becomes high temperature, heat dissipation effect, two outsides towards side are added Connection terminal 15a is able to maintain opposite low temperature.Therefore, in switch element 1, on external connection terminals 15a, installation weldering Material is difficult to melt.

As shown in Fig. 3 A~Fig. 3 C, because after the energization between the 1st electrode 11, the 2nd electrode 12 is cut off, high-melting-point gold Belong to the also persistent fever of body 15, so the refractory metal body 15 fuses (Fig. 3 A and Fig. 3 B) using the Joule heat of itself.Therefore, exist In switch element 1, because being cut off from functional circuit 32 to the energization of refractory metal body 15, so fever stops (Fig. 3 C). At this moment, in switch element 1, because being able to suppress arc discharge since refractory metal body 15 is coated by insulating layer 16, so The explosion type for being able to suppress fused conductor disperses.In addition, because attenuate due to being provided with part on refractory metal body 15 Heating part 15b, to become smaller at fusing, so the amount of dispersing of fused conductor can be reduced.

In this way, in switch element 1, because passing through the refractory metal with the fusing point higher than the fusing point of fusible conductor 13 Body 15 generates heat, and melts fusible conductor 13 prior to refractory metal body 15, so can make the 1st electrode 11, the 2nd electrode 12 energization cutting.That is, in switch element 1, the fusing of refractory metal body 15 be not intended to make the 1st electrode 11, The condition of energization cutting between 2nd electrode 12.Switch element 1 can be used as the exception of transmission accompaniment functions circuit 32 as a result, The alarm elements that refractory metal body 15 flows into the information of the overcurrent more than rated current use.Therefore, according to equipped with switch The exception of perceptional function circuit 32 as early as possible is capable of in the circuit for alarming 30 of element 1, the corresponding movement for extinguishing the alarm devices 31 such as indicator light, And because pre- defense sector stops functional circuit 32 before 32 complete failure of functional circuit, starting stand-by circuit etc. can be taken Countermeasure.

In addition, refractory metal body 15 is automatically stopped fever by fusing using the Joule heat of itself.Therefore, it is opening It closes in element 1, because not needing setting for limiting the mechanism of the power supply by functional circuit 32, can utilize simple Composition stops the fever of refractory metal body 15, and it is possible to realize the miniaturizations of entire element.

In addition, the heating part 15b with refractory metal body 15 in switch element 1, in the 1st electrode 11, the 2nd electrode 12 The electrode of a close side can also be connect with refractory metal body 15.As shown in Fig. 5 A~Fig. 5 C, in switch element 1, In the case where, can also be formed makes Gao Rong by the heating part 15b of refractory metal body 15 and the front end 11b of the 1st electrode 11 The interconnecting piece 19 that point metallic object 15 is connect with the 1st electrode 11.Interconnecting piece 19 is for example using electric with refractory metal body 15 or the 1st The identical conductive material in pole 11, process identical with refractory metal body 15 or the 1st electrode 11 patterning.

By connecting refractory metal body 15 with the 1st electrode 11, in switch element 1, because if refractory metal Body 15 generates heat when being powered, then fusible conductor 13 can also be transferred heat to by interconnecting piece 19 and the 1st electrode 11, so energy It is enough quickly to melt fusible conductor 13.Therefore, interconnecting piece 19 is preferably formed by metal materials such as thermal conductivity excellent Ag or Cu.

In addition, interconnecting piece 19 is arranged on the position at the center of the heating part 15b of refractory metal body 15 slightly away.Such as Interconnecting piece 19 is arranged in fruit, then resistance value is easily reduced and temperature is difficult to rise.Therefore, in order to which heating part 15b can generate heat generation High temperature, refractory metal body 15 is fused using self-heating simultaneously, it is necessary in the position at the center for leaving heating part 15b Upper setting interconnecting piece 19.

[lid part]

In switch element 1, on the insulating substrate 10, the lid part 20 protected inside the switch element 1 is installed.? In switch element 1, insulating substrate 10 is covered by lid part 20 to protect the inside of the switch element 1.Lid part 20 has There is the top part 22 of the upper surface of side wall 21, composition switch element 1 for the side for constituting switch element 1, passes through side wall 21 and insulation Substrate 10 connects, and becomes the cover board inside block switch element 1.The lid part 20 is for example using thermoplastic, ceramics, glass The insulating materials such as glass epoxy resin base plate are formed.

In addition, as shown in fig. 6, cover electrode 23 can also be formed in the inner face side of top part 22 in lid part 20. Cover electrode 23 is formed on the position Chong Die with the side in the 1st electrode 11 and the 2nd electrode 12.Cover electrode 23 is more preferred Close to the heating part 15b of refractory metal body 15, and the front end 11b with the 1st electrode 11 formed with relatively large area Overlapping.Because if melting fusible conductor 13 since refractory metal body 15 generates heat, then due to being aggregated in the 1st electrode 11 Fused conductor on the 11b of front end contacts with cover electrode 23, spreads wetting and increase the acceptable amount for keeping fused conductor, So can more reliably cut off the energization between the 1st electrode 11, the 2nd electrode 12 using cover electrode 23.

[variation 1]

In addition, on the surface of insulating substrate, refractory metal can also be made in the switch element for being applicable in this technology Body and the 1st electrode or the 2nd electrode are overlapped.In addition, in the following description, for structure identical with above-mentioned switch element 1 At element, appended drawing reference identical to this composition element affix, and the detailed description in relation to this composition element is omitted.? In switch element 40, as shown in figs. 7 a and 7b, refractory metal body 15 is formed so that it is in the surface 10a of insulating substrate 10 Mutual opposite direction side 10d, 10e between extend.In addition, in switch element 40, the 1st electrode 11, the respective edge of the 2nd electrode 12 Side 10b, 10c of mutual opposite direction in the surface 10a of insulating substrate 10 be respectively formed.

Refractory metal body 15 is coated in the substantially central portion of insulating substrate 10 by the 1st insulating layer 41.In addition, high-melting-point is golden Belonging to body 15 has the external connection terminals 15a formed on side 10d, 10e of insulating substrate 10 respectively.In addition, in high-melting-point In metallic object 15, by being formed in the middle part mode thinner than both ends, and the heating part 15b that fever generates high temperature is formd.

1st electrode 11 has the external connection terminals 11a being formed on the side 10b of insulating substrate 10, and the 2nd electrode 12 have the external connection terminals 12a being formed on the side 10c of insulating substrate 10.In addition, the 1st electrode 11 is formed in from side 10b is the upper surface of to the 1st insulating layer 41, and the 2nd electrode 12 the upper surface of is formed in from side 10c to the 1st insulating layer 41.The 1st The upper surface of insulating layer 41, since front end 11b, 12b are close and separate, so the 1st electrode 11, the 2nd electrode 12 separate.In addition, 1st electrode 11, the 2nd electrode 12 are coated by the 2nd insulating layer 42 respectively other than front end 11b, 12b.

The 1st electrode 11, the 2nd electrode 12 front end 11b, 12b on be provided with connection solder, use the connection weld Material connects fusible conductor 13 on front end 11b, 12b.In addition, in switch element 40, in the 1st electrode 11, the 2nd electrode 12 Either one as shown in figs. 7 a and 7b, the front end 11b in the 1st electrode 11 that is formed with relatively large area, before being connected to this A part of the fusible conductor 13 of end 11b and the heating part 15b of refractory metal body 15 are Chong Die.In addition, fusible conductor 13 is Prevent oxidation, improve wetability etc., it is coated with fluxing agent 18.

It, can be preferably exhausted with above-mentioned switch element 1 as the 1st insulating layer 41, the respective forming material of the 2nd insulating layer 42 Edge layer 16 is identical, insulating material containing glass etc..

According to such switch element 40, because making the front end 11b of the 1st electrode 11 and the respective big portion of fusible conductor 13 Divide and configured in a manner of Chong Die with the heating part 15b of refractory metal body 15, so by fast using the fever of heating part 15b Speed melts fusible conductor 13, it will be able to cut off the energization between the 1st electrode 11, the 2nd electrode 12.At this moment, in switch element In 40, because heating part 15b and the 1st electrode 11 and fusible conductor 13 are continuously accumulated by the 1st insulating layer 41 containing glass etc. Layer, so fusible conductor 13 effectively can be sent to the heating part 15b heat occurred.

[variation 2]

In addition, in the switch element for being applicable in this technology, because forming the 1st, 2 electrodes on the surface of insulating substrate, And refractory metal body is formed on the back side of the insulating substrate, so refractory metal body and the 1st electrode 11 can also be made Or the 2nd electrode 12 it is overlapped.In addition, in the following description, it is right for constituent element identical with above-mentioned switch element 1 The identical appended drawing reference of this composition element affix, and the detailed description in relation to this composition element is omitted.In switch element In 50, as shown in Fig. 8 A and Fig. 8 B, formed between side 10d, 10e of the mutual opposite direction of the back side 10f of insulating substrate 10 high Melting point metals body 15.In addition, in switch element 50, the surface 10a of the 1st electrode 11, each comfortable insulating substrate 10 of the 2nd electrode 12 Side 10b, 10c of mutual opposite direction be respectively formed.

Refractory metal body 15 is coated in the substantially central portion of insulating substrate 10 by the 1st insulating layer 51.In addition, high-melting-point is golden Belonging to body 15 has the external connection terminals 15a formed on side 10d, 10e of insulating substrate 10 respectively.In addition, in high-melting-point In metallic object 15, by being formed in the middle part Chong Die with the 1st electrode 11 or the 2nd electrode 12 mode thinner than both ends, and shape The heating part 15b of high temperature is generated at fever.

1st electrode 11 has the external connection terminals 11a being formed on the side 10b of insulating substrate 10, and the 2nd electrode 12 have the external connection terminals 12a being formed on the side 10c of insulating substrate 10.In addition, the 1st electrode 11 is formed in from side 10b to insulating substrate 10 surface 10a substantially central portion, and the 2nd electrode 12 is formed in 10 from side 10c to insulating substrate Surface 10a substantially central portion.In the substantially central portion of the surface 10a of insulating substrate 10, since front end 11b, 12b are close And separate, so the 1st electrode 11, the 2nd electrode 12 separate.In addition, the 1st electrode 11, the 2nd electrode 12 are in addition to front end 11b, 12b Except, it is coated respectively by the 2nd insulating layer 52.

The 1st electrode 11, the 2nd electrode 12 front end 11b, 12b on be provided with connection solder, use the connection weld Material connects fusible conductor 13 on front end 11b, 12b.In addition, in switch element 50, in the 1st electrode 11, the 2nd electrode 12 The front end 11b of the 1st electrode 11 formed with relatively large area, either one is connected to the front end as shown in Fig. 8 A and Fig. 8 B A part of the fusible conductor 13 of portion 11b and the heating part 15b of refractory metal body 15 are Chong Die.In addition, fusible conductor 13 in order to Prevent oxidation, improve wetability etc., it is coated with fluxing agent 18.

It, can be preferably exhausted with above-mentioned switch element 1 as the 1st insulating layer 51, the respective forming material of the 2nd insulating layer 52 Edge layer 16 is identical, insulating material containing glass etc..

According to such switch element 50, because making the front end 11b of the 1st electrode 11 and the respective big portion of fusible conductor 13 Divide and configured in a manner of Chong Die with the heating part 15b of refractory metal body 15, so faster by the fever using heating part 15b Melt fusible conductor 13, it will be able to cut off the energization between the 1st electrode 11, the 2nd electrode 12.At this moment, in switch element 50 In, it is and same in the face with being provided with fusible conductor 13 by using the ceramic substrate etc. that thermal conductivity is excellent as insulating substrate 10 The case where refractory metal body 15 is formed on one face is identical, can heat fusible conductor 13.

[variation of fusible conductor]

As described above, any portion or whole in fusible conductor 13 can also contain low-melting-point metal and high-melting-point gold Belong to.For high melting point metal layer 60 by least being formed containing one of Ag and Cu as the material of its constitution element, which can also To be alloy.Low-melting-point metal layer 61 is containing solder or with Sn lead-free solder as main component etc..At this moment, as fusible Conductor 13 also can be used containing the high melting point metal layer 60 as internal layer and as the low melting point gold of outer layer as shown in Figure 9 A Belong to the fusible conductor of layer 61.In this case, fusible conductor 13 can have high melting point metal layer 60 whole surface it is low The coating construction of melting point metal layer 61, it is possible to have other than mutual opposite a pair of of side, 60 quilt of high melting point metal layer The coating construction of low-melting-point metal layer 61.By the coating construction of high melting point metal layer 60 or low-melting-point metal layer 61, can make The film technique known to plating etc. is formed.

In addition, as shown in Figure 9 B, as fusible conductor 13, also can be used containing the low-melting-point metal layer as internal layer 61 and the high melting point metal layer 60 as outer layer fusible conductor.In this case, fusible conductor 13 also can have eutectic The construction that the whole surface of point metal layer 61 is coated by high melting point metal layer 60, it is possible to have in addition to a mutual opposite opposite side Except face, construction that low-melting-point metal layer 61 is coated by high melting point metal layer 60.

In addition, fusible conductor 13 is as shown in Figure 10 A and Figure 10 B, it is possible to have high melting point metal layer 60 and low melting point gold Belong to layer 61 to be constructed by the lamination of lamination.

Specifically, fusible conductor 13 is as shown in Figure 10 A, can also be supported with containing by the 1st electrode 11 and the 2nd electrode 12 Upper layer in the lower layer of lower layer and lamination the formation of 2 layers of construction.In such a case, it is possible in the Gao Rong as lower layer The upper surface of point metal layer 60 low-melting-point metal layer 61 of the lamination as upper layer, on the contrary can also be in the low-melting-point metal as lower layer The upper surface of layer 61 high melting point metal layer 60 of the lamination as upper layer.Alternatively, fusible conductor 13 is as shown in Figure 10 B, it can also be to contain There is internal layer and 3 layers of construction of 2 outer layers of lamination are formed on the top and bottom of the internal layer.In such a case, it is possible in conduct 2 low-melting-point metal layers 61 of the lamination as outer layer, can also make on the contrary on the top and bottom of the high melting point metal layer 60 of internal layer For 2 high melting point metal layers 60 of the lamination as outer layer on the top and bottom of the low-melting-point metal layer 61 of internal layer.

In addition, fusible conductor 13 is as shown in figure 11, it is possible to have high melting point metal layer 60 and 61 quilt of low-melting-point metal layer Alternately 4 layers or more of multi-ply construction of lamination.In this case, fusible conductor 13 also can have whole surface or in addition to Mutually except opposite a pair of of side, the metal layer other than outermost layer is configured the coating construction of outermost metal layer.

In addition, fusible conductor 13 also can have high melting point metal layer 60 by a manner of striated lamination as internal layer Low-melting-point metal layer 61 surface on construction.Figure 12 A and Figure 12 B are the plan views of fusible conductor 13.

It is multiple in width by being formed on the surface of low-melting-point metal layer 61 in fusible conductor 13 as illustrated in fig. 12 The linear high melting point metal layer 60 for being separated by predetermined interval arrangement on degree direction and extending in the longitudinal direction, can be along length Direction forms linear opening portion 62, and low-melting-point metal layer 61 exposes in the opening portion 62.In fusible conductor 13, because If low-melting-point metal layer 61 exposes in opening portion 62, due to the low-melting-point metal of melting and the contact area of refractory metal Increase, the corrosion of high melting point metal layer 60 is more promoted, so can be improved the fusing of fusible conductor 13.Opening portion 62 for example on low-melting-point metal layer 61, constitutes the parcel plating of the metal of high melting point metal layer 60 by implementation to be formed.

In addition, in fusible conductor 13 as shown in Figure 12 B, shape can also be passed through on the surface of low-melting-point metal layer 61 It is arranged and linear high melting point metal layer 60 extended in the direction of the width at multiple predetermined interval that are separated by the longitudinal direction, edge The width direction form linear opening portion 62.

In addition, in fusible conductor 13, as shown in figure 13, by forming high-melting-point on the surface of low-melting-point metal layer 61 Metal layer 60, and circular opening portion 63 is formed in the whole surface of the high melting point metal layer 60, low melting point can also be made Metal layer 61 exposes in the opening portion 63.Opening portion 63 constitutes high-melting-point gold for example on low-melting-point metal layer 61, by implementing Belong to the parcel plating of the metal of layer 60 to be formed.

In fusible conductor 13, because if low-melting-point metal layer 61 exposes in opening portion 63, then due to the eutectic of melting The contact area of point metal and refractory metal increases, and the corrosion of refractory metal is more promoted, so can be improved The fusing of fusible conductor 13.

In addition, as shown in figure 14, forming multiple open on the high melting point metal layer 60 as internal layer in fusible conductor 13 Oral area 64 can also opened by making low-melting-point metal layer 61 form a film on the high melting point metal layer 60, using electroplating technology etc. Low-melting-point metal layer 61 is filled in oral area 64.Therefore, in fusible conductor 13, because of the low-melting-point metal of melting and high-melting-point gold The contact area of category increases, so low-melting-point metal being capable of corrode refractory metal within the shorter time.

In addition, preferably making the volume of low-melting-point metal layer 61 be greater than the body of high melting point metal layer 60 in fusible conductor 13 Product.In fusible conductor 13, because making the eutectic of the fusible conductor 13 by heating fusible conductor 13 by refractory metal body 15 Point metal corrode refractory metal while melting, so fusible conductor 13 can quickly be made to melt and fuse.Therefore, can In molten conductor 13, by making the volume of low-melting-point metal layer 61 be greater than the volume of high melting point metal layer 60, the corrode can be promoted Effect, the quickly energization between the 1st electrode 11 of cutting, the 2nd electrode 12.

The disclosure contains the Japanese Priority Patent Application for relating to submit on January 20th, 2014 in Japanese Patent Office Purport disclosed in JP2014-008133, entire contents include here, for reference.

It should be appreciated by those skilled in the art, although according to design requirement and other factors be likely to occur various modifications, Combination, sub-portfolio and replaceable item, but they are all contained in the range of appended claims or its equivalent.

This technology can also use following composition.

(1)

A kind of switch element, has:

Fusible conductor；

1st electrode is connected to the one end of the fusible conductor；

2nd electrode is connected to the other end of the fusible conductor；And

Refractory metal body has the fusing point higher than the fusing point of the fusible conductor.

(2)

Switch element described in above-mentioned (1), wherein using with the rated current for flowing into the refractory metal body with On overcurrent and the heat that occurs melts the fusible conductor.

(3)

Switch element described in above-mentioned (1) or (2), wherein the refractory metal body makes the 1st electrode and institute After stating the energization cutting between the 2nd electrode, fused using the self-heating with overcurrent more than rated current.

(4)

Switch element described in any one of above-mentioned (1) to (3), wherein the refractory metal body, the 1st electricity Pole and the 2nd electrode are formed in the electrode pattern on insulating substrate respectively.

(5)

Switch element described in above-mentioned (4), wherein

The refractory metal body, the 1st electrode and the 2nd electrode are the high-melting-point gold that patterning is formed respectively Belong to,

The refractory metal at least contains silver one of (Ag) and copper (Cu) and is used as its constitution element.

(6)

Switch element described in above-mentioned (4) or (5), wherein

The refractory metal body as the electrode pattern includes local pyrexia generation high temperature due to current convergence Heating part,

The heating part be the refractory metal body with the part that partially attenuates on the fusible conductor close position.

(7)

Switch element described in above-mentioned (6), wherein be connected to the front end of the 1st electrode of the fusible conductor It is approached with either in the front end for the 2nd electrode for being connected to the fusible conductor with the heating part.

(8)

Switch element described in above-mentioned (7), wherein

The 1st electrode for being connected to the fusible conductor front end and be connected to described the of the fusible conductor In the front end of 2 electrodes, the area of the front end of area ratio another party of the front end of a close side is big with the heating part,

And the electrode of the front end with a side keeps more institutes than the electrode of the front end with the another party State fusible conductor.

(9)

Switch element described in above-mentioned (7) or (8), wherein in the 1st electrode and the 2nd electrode, have with The electrode of one side of the close front end of the heating part is connect with the refractory metal body.

(10)

Switch element described in any one of above-mentioned (1) to (9), wherein the refractory metal body is by insulating layer quilt It covers.

(11)

Switch element described in any one of above-mentioned (4) to (10), wherein the refractory metal body and it is described absolutely Insulating layer is formed between edge substrate.

(12)

Switch element described in any one of above-mentioned (1) to (11), wherein the 1st electrode and the 2nd electrode remove It is connected with except the part of the fusible conductor, is coated respectively by insulating layer.

(13)

Switch element described in any one of above-mentioned (10) to (12), wherein

The insulating layer contains insulating material,

The insulating material contains glass.

(14)

Switch element described in any one of above-mentioned (1) to (3), wherein the refractory metal body is at least to contain The foil of one of copper and silver as its constitution element, or at least containing one of copper and silver as its constitution element Silk.

(15)

Switch element described in any one of above-mentioned (4) to (14), wherein the 1st electrode and the 2nd electrode with The refractory metal body is configured at the same plane of the insulating substrate side by side.

(16)

Switch element described in any one of above-mentioned (4) to (8), wherein on the face of a side of the insulating substrate, A side and the fusible conductor for the electrode for being connected to a side in 1st electrode and the 2nd electrode, pass through insulating layer Lamination is on the refractory metal body.

(17)

Switch element described in any one of above-mentioned (4) to (8), wherein

On the face of a side of the insulating substrate, the 1st electrode and the 2nd electrode are configured；

On the face of another party of the insulating substrate, the refractory metal body is configured；

The refractory metal body and the 1st electrode and a side in the 2nd electrode and the electricity for being connected to a side The fusible conductor of pole is overlapped.

(18)

Switch element described in above-mentioned (16) or (17), wherein in the refractory metal body and the insulating substrate Between be formed with insulating layer.

(19)

Switch element described in any one of above-mentioned (16) to (18), wherein the 1st electrode and the 2nd electrode Other than being connected with the part of the fusible conductor, it is coated respectively by the insulating layer.

(20)

Switch element described in any one of above-mentioned (16) to (19), wherein

The insulating layer contains insulating material,

The insulating material contains glass.

(21)

Switch element described in any one of above-mentioned (4) to (20), wherein the insulating substrate is ceramic substrate.

(22)

Switch element described in any one of above-mentioned (1) to (21), wherein the fusible conductor contains solder.

(23)

Switch element described in any one of above-mentioned (1) to (21), wherein

The fusible conductor contains low-melting-point metal and refractory metal；

The low-melting-point metal is melted using the fever of the refractory metal body, while the corrode refractory metal.

(24)

Switch element described in above-mentioned (23), wherein

The low-melting-point metal contains solder,

The refractory metal at least contains one of silver and copper and is used as its constitution element.

(25)

Switch element described in above-mentioned (23) or (24), wherein the fusible conductor, which has, includes the height as internal layer The coating construction of melting point metal layer and the low-melting-point metal layer as outer layer.

(26)

Switch element described in above-mentioned (23) or (24), wherein the fusible conductor has comprising as the low of internal layer The coating construction of melting point metal layer and the high melting point metal layer as outer layer.

(27)

Switch element described in above-mentioned (23) or (24), wherein the fusible conductor has low-melting-point metal layer and height Melting point metal layer is constructed by the lamination of lamination.

(28)

Switch element described in above-mentioned (23) or (24), wherein the fusible conductor has low-melting-point metal layer and height Melting point metal layer is by 4 layers or more of multi-ply construction of alternately lamination.

(29)

Switch element described in above-mentioned (23) or (24), wherein

The fusible conductor has the high melting point metal layer as outer layer by lamination in the low-melting-point metal layer as internal layer Surface lamination construction,

The high melting point metal layer is provided with opening portion.

(30)

Switch element described in above-mentioned (23) or (24), wherein

The fusible conductor includes to have the high melting point metal layer of multiple opening portions and be formed on the high melting point metal layer Low-melting-point metal layer,

The low-melting-point metal layer is filled in the opening portion.

(31)

Switch element described in any one of above-mentioned (23) to (30), wherein in the fusible conductor, low melting point gold The volume of the volume ratio refractory metal of category is big.

(32)

Switch element described in any one of above-mentioned (1) to (31), wherein on the fusible conductor, coating is helped Solder flux.

(33)

Switch element described in any one of above-mentioned (1) to (32), wherein the 1st electrode and the 2nd electrode are each From surface by any coating in the plating of nickel (Ni)/gold (Au), Ni/ palladium (Pd) plating and Ni/Pd/Au plating.

(34)

Switch element described in any one of above-mentioned (4) to (33), wherein

Have the lid part being arranged on the insulating substrate,

The lid part on Chong Die position, be provided with either in the 1st electrode and the 2nd electrode Cover electrode.

(35)

A kind of switching circuit, has:

Switch portion, comprising passing through by the interconnection of the 1st fuse and the 1st electrode being connect with external circuit and the 2nd electrode Cutting off the energization between the 1st electrode and the 2nd electrode stops the power supply to the external circuit；

2nd fuse has the fusing point higher than the fusing point of the 1st fuse, and with the switch portion electrically independent function electricity Road connection.

(36)

Switching circuit described in above-mentioned (35), wherein by using with the rated current for flowing into the 2nd fuse with On overcurrent and the heat that occurs make the 1st fuse melting, cut off it is logical between the 1st electrode and the 2nd electrode Electricity stops the power supply to the external circuit.

(37)

Switching circuit described in above-mentioned (35) or (36), wherein the 2nd fuse after making the 1st fuse failure, It is fused using the self-heating with overcurrent more than rated current.

(38)

A kind of circuit for alarming, has:

Driving circuit, comprising passing through cutting the 1st electricity by the 1st fuse the 1st electrode interconnected and the 2nd electrode Energization between pole and the 2nd electrode and stop the power supply to alarm device；

2nd fuse, it is electrically independent with the driving circuit, there is the fusing point higher than the fusing point of the 1st fuse；

Control circuit is series at the functional circuit of power supply with the 2nd fuse.

(39)

Circuit for alarming described in above-mentioned (38), wherein by flowing into institute using adjoint in the functional circuit exception The heat stating the overcurrent of the rated current of the 2nd fuse or more and occurring makes the 1st fuse melting, cuts off the 1st electrode With the energization between the 2nd electrode, stop the power supply to the alarm device.

(40)

Circuit for alarming described in above-mentioned (38) or (39), wherein the 2nd fuse after making the 1st fuse failure, It is fused using the self-heating with overcurrent more than rated current.

The explanation of symbol

1,40,50: switch element

10: insulating substrate

10a: surface

10f: the back side

11: the 1 electrodes

12: the 2 electrodes

13: fusible conductor

15: refractory metal body

16: insulating layer

18: scaling powder

19: interconnecting piece

20: lid part

21: side wall

22: top part

23: cover electrode

30: circuit for alarming

31: alarm device

32: functional circuit

35: the 1 fuses

36: the 2 fuses

Claims (37)

1. a kind of switch element, has:

Fusible conductor；

1st electrode is connected to the one end of the fusible conductor；

2nd electrode is connected to the other end of the fusible conductor；And

Refractory metal body has the fusing point higher than the fusing point of the fusible conductor,

Made using the heat occurred with the overcurrent more than rated current for flowing into the refractory metal body described fusible Conductor melting.

2. switch element according to claim 1, wherein the refractory metal body make the 1st electrode with it is described After energization cutting between 2nd electrode, fused using the self-heating with overcurrent more than rated current.

3. switch element according to claim 1, wherein the refractory metal body, the 1st electrode and the described 2nd Electrode is formed in the electrode pattern on insulating substrate respectively.

4. switch element according to claim 3, wherein

The refractory metal body, the 1st electrode and the 2nd electrode are the refractory metal that patterning is formed respectively,

The refractory metal at least contains one of silver and copper and is used as its constitution element.

5. switch element according to claim 3, wherein

The refractory metal body as the electrode pattern includes the hair of local pyrexia generation high temperature due to current convergence Hot portion,

The heating part be the refractory metal body with the part that partially attenuates on the fusible conductor close position.

6. switch element according to claim 5, wherein be connected to the front end of the 1st electrode of the fusible conductor Portion and be connected to the fusible conductor the 2nd electrode front end in either it is close with the heating part.

7. switch element according to claim 6, wherein

The 1st electrode for being connected to the fusible conductor front end and be connected to the fusible conductor it is described 2nd electricity In the front end of pole, the area of the front end of area ratio another party of the front end of a close side is big with the heating part,

And it can described in the electrode of the front end with a side is more more than the electrode holding of the front end with the another party Molten conductor.

8. switch element according to claim 6, wherein in the 1st electrode and the 2nd electrode, have and institute The electrode for stating a side of the close front end of heating part is connect with the refractory metal body.

9. switch element according to claim 1, wherein the refractory metal body is coated by insulating layer.

10. switch element according to claim 3, wherein between the refractory metal body and the insulating substrate It is formed with insulating layer.

11. switch element according to claim 1, wherein the 1st electrode and the 2nd electrode are in addition to connecting Except the part for stating fusible conductor, it is coated respectively by insulating layer.

12. switch element according to claim 9, wherein

The insulating layer contains insulating material,

The insulating material contains glass.

13. switch element according to claim 1, wherein the refractory metal body is at least containing in copper and silver A kind of foil as its constitution element, or the silk at least containing one of copper and silver as its constitution element.

14. switch element according to claim 3, wherein the 1st electrode and the 2nd electrode and the high-melting-point Metallic object is configured at the same plane of the insulating substrate side by side.

15. switch element according to claim 3, wherein a surface in two surfaces of the insulating substrate On, a side and the fusible conductor for the electrode for being connected to a side in the 1st electrode and the 2nd electrode, by exhausted Edge layer lamination is on the refractory metal body.

16. switch element according to claim 3, wherein

On a surface in two surfaces of the insulating substrate, the 1st electrode and the 2nd electrode are configured；

On another surface in two surfaces of the insulating substrate, the refractory metal body is configured；

The refractory metal body and the 1st electrode and a side in the 2nd electrode and the electrode for being connected to a side The fusible conductor is overlapped.

17. switch element according to claim 15, wherein between the refractory metal body and the insulating substrate It is formed with insulating layer.

18. switch element according to claim 15, wherein the 1st electrode and the 2nd electrode are in addition to connecting Except the part for stating fusible conductor, it is coated respectively by the insulating layer.

19. switch element according to claim 15, wherein

The insulating layer contains insulating material,

The insulating material contains glass.

20. switch element according to claim 3, wherein the insulating substrate is ceramic substrate.

21. switch element according to claim 1, wherein the fusible conductor contains solder.

22. switch element according to claim 1, wherein

The fusible conductor contains low-melting-point metal and refractory metal；

The low-melting-point metal is melted using the fever of the refractory metal body, while the corrode refractory metal.

23. switch element according to claim 22, wherein

The low-melting-point metal contains solder,

The refractory metal at least contains one of silver and copper and is used as its constitution element.

24. switch element according to claim 22, wherein the fusible conductor, which has, includes the high-melting-point as internal layer The coating construction of metal layer and the low-melting-point metal layer as outer layer.

25. switch element according to claim 22, wherein the fusible conductor, which has, includes the low melting point as internal layer The coating construction of metal layer and the high melting point metal layer as outer layer.

26. switch element according to claim 22, wherein the fusible conductor has low-melting-point metal layer and high-melting-point Metal layer is constructed by the lamination of lamination.

27. switch element according to claim 22, wherein the fusible conductor has low-melting-point metal layer and high-melting-point Metal layer is by 4 layers or more of multi-ply construction of alternately lamination.

28. switch element according to claim 22, wherein

The fusible conductor have as outer layer high melting point metal layer by lamination the low-melting-point metal layer as internal layer table The lamination in face constructs,

The high melting point metal layer is provided with opening portion.

29. switch element according to claim 22, wherein

The fusible conductor includes to have the high melting point metal layer of multiple opening portions and be formed in low on the high melting point metal layer Melting point metal layer,

The low-melting-point metal layer is filled in the opening portion.

30. switch element according to claim 22, wherein in the fusible conductor, the volume ratio of low-melting-point metal The volume of refractory metal is big.

31. switch element according to claim 1, wherein on the fusible conductor, be coated with fluxing agent.

32. switch element according to claim 1, wherein the 1st electrode and the respective surface quilt of the 2nd electrode It is any coating in ni au plated, nickel/palladium plating and nickel/palladium/gold plating.

33. switch element according to claim 3, wherein

Have the lid part being arranged on the insulating substrate,

The lid part on Chong Die position, be provided with cover either in the 1st electrode and the 2nd electrode Electrode.

34. a kind of switching circuit, has:

Switch portion, comprising passing through cutting by the interconnection of the 1st fuse and the 1st electrode connecting with external circuit and the 2nd electrode Energization between 1st electrode and the 2nd electrode stops the power supply to the external circuit；

2nd fuse has the fusing point higher than the fusing point of the 1st fuse, connects with the electrically independent functional circuit of the switch portion It connects,

It is melted by making the described 1st using the heat occurred with the overcurrent more than rated current for flowing into the 2nd fuse Energization between the 1st electrode and the 2nd electrode is cut off in silk melting, stops the power supply to the external circuit.

35. switching circuit according to claim 34, wherein the 2nd fuse is after making the 1st fuse failure, benefit It is fused with the self-heating with overcurrent more than rated current.

36. a kind of circuit for alarming, has:

Driving circuit, comprising by the 1st fuse the 1st electrode interconnected and the 2nd electrode, by cut off the 1st electrode with Energization between 2nd electrode and stop the power supply to alarm device；

2nd fuse, it is electrically independent with the driving circuit, there is the fusing point higher than the fusing point of the 1st fuse；

Control circuit is series at the functional circuit of power supply with the 2nd fuse,

By being sent out using in the functional circuit exception with the overcurrent more than rated current for flowing into the 2nd fuse Raw heat makes the 1st fuse melting, cuts off the energization between the 1st electrode and the 2nd electrode, makes to the alarm The power supply of device stops.

37. circuit for alarming according to claim 36, wherein the 2nd fuse is after making the 1st fuse failure, benefit It is fused with the self-heating with overcurrent more than rated current.