CN2470923Y - Surface-adhesive electric appliance - Google Patents
Surface-adhesive electric appliance Download PDFInfo
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- CN2470923Y CN2470923Y CN 00257994 CN00257994U CN2470923Y CN 2470923 Y CN2470923 Y CN 2470923Y CN 00257994 CN00257994 CN 00257994 CN 00257994 U CN00257994 U CN 00257994U CN 2470923 Y CN2470923 Y CN 2470923Y
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Abstract
The utility model relates to an electric appliance with an adhesive surface. The utility model comprises a thin plate type resistance element (1) which is provided with a first surface, a second surface, a first end face and a second end face, a first conducting component (2) which is arranged on the first surface and extends to the first end face, a second conducting component (3) which is arranged on the second surface and extends to the second end face, a first insulating film (4) which is arranged on the first conducting component and extends to the second end face, a second insulating film (5) which is arranged on the second conducting component and extends to the first end face, a first electric pole (6) and a second electric pole (7), wherein the first surface is opposite to the second surface, and the first end face is opposite to the second end face. The utility model has the advantages of high quality, stable performance, and broad range of application.
Description
The utility model relates to a kind of variable temperature-sensitive electric device, especially relates to a kind of variable temperature-sensitive electric device of surface adhesion type that can be applicable on the printed circuit board (PCB).
Polyethylene with organic high molecular polymer such as TPO is a material, adds conductive filler such as carbon black or metallic particles or powder and the conductive composite material formed, can produce many application (application) mode.Among these many application, the resistance variations phenomenon with nonlinear positive temperature coefficient (PTC) is the most outstanding again.This PTC can be designed to electronic component or electric device, is used for protective circuit, and prevent because of overheated or overcurrent the circuit infringement that may cause.
Briefly, this kind material is when room temperature, and resistance value is to remain on low resistance state, when temperature moment rise to a critical temperature or moment have the excess electric current by the time, its resistance value can jump at once to more than thousands of times (103).The change of this kind resistance beat type can suppress effectively or cuts off the excess electric current that passes through, and avoids the purpose of burning thereby reach protection circuit.Another tangible advantage of this kind PTC element is, when temperature retrieval is normal, or after the situation of overcurrent disappeared, its resistance value can return back to low resistance state, thereby can make circuit normal running again.As fuse must not replied normally through just making circuit after changing.Just because of this advantage, this PTC protection component that need not change in the high density electronics systems, more needs for realizing that defencive function seems in design.
Yet, in high-density line design and making, be that it will reach gently, approaches, small feature, and need reach surface adhesion type installing the dimensional requirement of protection component.Therefore, PTC element with the high-molecular organic material making, be designed to the surface adhesion type electronic component of different types, as No. the 5089801st, United States Patent (USP) disclose, owing to wherein used the conductive electrode of each pair of planar formula up and down, therefore on making, must consider this plane formula conductive metal electrode (conductive metal terminal as electrode) and the PTC element bonding stability of planar metal membrane electrode layer up and down, and the shortcoming of this element design is that up and down conductive metal electrode and flat film electrode often easily produce separation when the reflow hot blast is installed on the circuit board for they.
No. the 5864281st, United States Patent (USP) disclose with the etching mode electrode film that the PTC upper and lower surface is accompanying, remove by designed pattern, etch into the PTC layer always, again along the etching rill, make it fracture with external force, thereby make resistive element, this patent emphasizes that element creates with fracture mode, so that element contains the edge (fractured surface) that fracture causes, this patent is not described with component structure and is changed the heat conducting problem that solves.
United States Patent (USP) has disclosed other several New PTC element for No. 5831510 and No. 5852397, it is to the design of two electrode tips, basically be to adopt general PCB design, circuit is seen through Durchgangshohle, to electroplate the mode of conducting, make the electrode layer that separates separately up and down, change to the planar configuration of symmetrical expression.Though the plane formula conductive electrode that adds has been cancelled in this design, overcome the shortcoming of preceding paragraph patent (No. the 5089801st, United States Patent (USP)) design, still have the restriction of following several functions to demand urgently improving:
(1) element radiating is too fast, so that be subject to the influence of circuit width, thickness or position on surrounding environment such as the printed circuit board (PCB), and directly be reflected on the resistance variations of element, make beating of resistance be difficult to prediction and control.
(2) because of the difference of the thermal coefficient of expansion of metal electrode film and electric conducting material, cause the uneven phenomenon of material stress in manufacture process, to occur, cause it in use easily to cause the phenomenon of stripping electrode, and can't reach original function.
(3) electrode at two ends up and down must the electrode film on two planes be separated with etching mode up and down earlier, makes its every face that two districts be arranged, so that cause effective usable floor area to reduce.
The purpose of this utility model is to provide a kind of surface adhering electric device, it is convenient to surface adhesive type and is mounted on the printed circuit, not only element radiating is slow, is not subject to the influence of circuit width, thickness or position on surrounding environment such as the printed circuit board (PCB), the beat prediction easily and the control of resistance; And in use electrode can not peeled off, and capability and performance is firm, and element do not have the edge that causes of fracture, and effective usable floor area of electrode is big.
For achieving the above object, the utility model provides a kind of surface adhering electric device, comprising:
(1) sheet-type resistive element, formed by having the macromolecular material that conducting particles is scattered in wherein, this has the sheet-type resistive element of positive temperature or negative temperature coefficient character, have opposite first and second surface, also have the first relative end face and second end face, this first end face and second end face are to extend to second surface from first surface respectively;
(2) first conductive members are arranged at the first surface of this sheet-type resistive element, and extend to first end face;
(3) second conductive members are arranged at the second surface of this sheet-type resistive element, and extend to second end face;
(4) first dielectric films are arranged on this first conductive member, and extend to second end face of this sheet-type resistive element;
(5) second dielectric films are arranged on this second conductive member, and extend to first end face of this sheet-type resistive element;
(6) first electrodes comprise a main part and a junction; The main part of this first electrode comprises the pair of metal paillon foil, is to be divided on first dielectric film and second dielectric film; The connecting portion of this first electrode comprises a conducting film, is to couple this to tinsel and this first conductive member along first end face; And
(7) second electrodes comprise a main part and a junction; The main part of this second electrode comprises the pair of metal paillon foil, is to be divided on first dielectric film and second dielectric film; The connecting portion of this second electrode comprises a conducting film, is to couple this to tinsel and this second conductive member along second end face.
Described surface adhering electric device is characterized in that: this macromolecular material is to select from polyethylene, and polypropylene gathers fluorine alkene, reaches the mixture and the co-polymer of polyethylene, polypropylene, poly-fluorine alkene.
Described surface adhering electric device is characterized in that: this conducting particles is to select from metallic, carbon contg particle, metal oxide, metal carbides, and the mixture of metallic, carbon contg particle, metal oxide, metal carbides.
Described surface adhering electric device is characterized in that: the material of described conductive member is to select from nickel, copper, and zinc, silver, gold reaches nickel, copper, zinc, silver, golden alloy or the multilayer material of being formed.
Described surface adhering electric device is characterized in that: described dielectric film is a then property glued membrane.
Described surface adhering electric device is characterized in that: described dielectric film is the made then property glued membrane of epoxy resin and glass fabric.
Described surface adhering electric device is characterized in that: described tinsel is a Copper Foil.
Described surface adhering electric device is characterized in that: described conducting film is copper or the gold that is plated to electroless-plating or electro-plating method.
Described surface adhering electric device is characterized in that: also comprise:
(8) a pair of insulating element that first electrode and second electrode are isolated mutually is to be divided on first dielectric film and second dielectric film.
Described surface adhering electric device is characterized in that: this insulating element is an anti-welding coating.
The utility model also provides a kind of surface adhering electric device, comprising:
(A) the first resistance assembly comprises:
(1) sheet-type resistive element is scattered in wherein macromolecule material by having conducting particles
Material is formed; This has the sheet-type resistance of positive temperature or negative temperature coefficient character
Element has opposite first and second surface, also has relative first
The end face and second end face, this first end face and second end face are respectively from first table
Face extends to second surface;
(2) first conductive members are to be arranged at this to approach the first surface of pulling the type resistive element,
And extend to first end face;
(3) second conductive members are the second surfaces that are arranged at this sheet-type resistive element,
And extend to second end face;
(4) first dielectric films are to be arranged on this first conductive member, and extend to that this is thin
Second end face of template resistive element;
(5) second dielectric films are to be arranged on this second conductive member, and extend to that this is thin
First end face of template resistive element;
(B) at least one second resistance assembly identical with the first resistance assembly, this second resistance assembly is to be stacked on the described first resistance assembly;
(C) first electrode comprises a main part and a junction, and the main part of this first electrode comprises the pair of metal paillon foil, is to be divided on the first resistance assembly and the second resistance assembly; This connecting portion comprises a conducting film, is to couple this to the tinsel and first conductive member along first end face; And
(D) second electrode comprises a main part and a junction, and the main part of this second electrode comprises the pair of metal paillon foil, is to be divided on the first resistance assembly and the second resistance assembly; This connecting portion comprises a conducting film, is to couple this to the tinsel and second conductive member along second end face.
Described surface adhering electric device is characterized in that: this macromolecular material is to select from polyethylene, and polypropylene gathers fluorine alkene, reaches the mixture and the co-polymer of polyethylene, polypropylene, poly-fluorine alkene.
Described surface adhering electric device is characterized in that: this conducting particles is to select from metallic, carbon contg particle, metal oxide, metal carbides, and the mixture of metallic, carbon contg particle, metal oxide, metal carbides.
Described surface adhering electric device is characterized in that: the material of described conductive member is to select from nickel, copper, and zinc, silver, gold reaches nickel, copper, zinc, silver, golden alloy or the multilayer material of being formed.
Described surface adhering electric device is characterized in that: this dielectric film is a then property glued membrane.
Described surface adhering electric device is characterized in that: described dielectric film is the made then property glued membrane of epoxy resin and glass fabric.
Described surface adhering electric device is characterized in that: described tinsel is a Copper Foil.
Described surface adhering electric device is characterized in that: described conducting film is copper or the gold that is plated to electroless-plating or electro-plating method.
Described surface adhering electric device is characterized in that: also comprise:
(E) a pair of insulating element that first electrode and second electrode are isolated mutually is to be divided on the first resistance assembly and the second resistance assembly.
Described surface adhering electric device is characterized in that: this insulating element is an anti-welding coating.
After having adopted said structure, surface adhering electric device of the present utility model includes the sheet-type resistive element, first conductive member, second conductive member, first dielectric film, second dielectric film, first electrode and second electrode.Its will general known thermistor element (as the PTC element) its electrode film of two layer plane formulas up and down, be connected to any same plane via external superimposed electrode layer and suitable via with plating mode, be mounted on the printed circuit and be convenient to surface adhesive type.Because of it can be by the then effect of glued membrane, conductive resistance element more than two layers is comprised wherein, make that the heat radiation of traditional type surface adhering resistance is too fast, and context and the highstrung shortcoming of conductor width size are improved, in addition in outer field up and down plastics, make that internal stress is inhomogeneous in the prior art, dimensional stability is poor, cause sheet bending distortion and resistance inhomogeneities, all reduce because of the dimensional stability of X.Y axle increases.In conventionally known element design, on (as U.S. Patent number 5831510 and 5852397) every electrode the etching cut-off rule must be arranged, cause effective usable floor area to reduce, as long as the utility model has not only increased usable floor area through the suitable etching of emargintion, has also reduced impedance.Pass through the parallel effect of each layer conductive plastics in its multiple-plate element design, (1/R1+1/R2+1/R3+ ... + 1/Rn) can cause last resistance to reduce, enlarge its range of application.
Below, in conjunction with the accompanying drawings and embodiments the utility model is done further detailed description.
Fig. 1 is the end view of the utility model one preferred embodiment.
Fig. 2 A is the top view of the tabular resistive element of book and conductive member in the surface adhering electric device.
Fig. 2 B is the bottom view of the tabular resistive element of book and conductive member in the surface adhering electric device.
Fig. 3 A is the end view of the surface adhering electric device of another preferred embodiment of the utility model.
Fig. 3 B is the connect in parallel circuit diagram of the surface adhering electric device of another preferred embodiment of the utility model.
Below will cooperate Fig. 1～3, the surface adhering thermistor element of the utility model one preferred embodiment will be described.At first, with reference to Fig. 1, it illustrates the end view of the utility model one preferred embodiment electric device, by among the figure as can be known this electric device mainly be by lamellar resistive element 10, dielectric film 14, and be coupled to 16,18 of outer electrodes respectively by conductive member 12a, 126 and constitute.
Above-mentioned resistive element 10 is formed by having the macromolecular material that conducting particles is scattered in wherein, and it has the character of positive temperature or negative temperature coefficient.Be applicable to that macromolecular material of the present utility model comprises: polyethylene, polypropylene, poly-fluorine alkene, aforesaid mixture and co-polymer etc.Conducting particles can be metallic, carbon contg particle, metal oxide, metal carbides, or the mixture of previous materials.
In the upper and lower surface of resistive element 10, be respectively arranged with the first conductive member 12a and the second conductive member 12b, and extend to the opposite end surface of sheet-type resistive element separately.This conductive member can be by a planar metal book film, produces top and bottom through general etching mode (as Laser Trimming, chemical etching or mechanical system), a first from left right each one, asymmetric breach (breach that the stripping metal film produces) is as Fig. 2 A, shown in the 2B.The material of above-mentioned conductive member can be nickel, copper, zinc, Kun, gold, reaches alloy or multilayer material that aforementioned metal is formed.In addition, though the breach in the present embodiment is a rectangle, and the breach of other shapes as semicircle, triangle or irregularly shaped and pattern also applicable to the utility model, just this breach area be no more than the single face gross area 25% for good.
Above-mentioned breach is after the moulding of stripping metal film, can use various good then property glued membrane 14a, 14b (glued membrane of making as epoxy resin and glass fabric), with the metal copper film of this resistive element and outer each a slice up and down through the hot-press solidifying driving fit, afterwards, can be with outer field copper film up and down through engraving method, the electrode tip of two districts symmetry about generation is shown among the figure 16,18.
Two end electrodes district, the left and right sides can be by via 13,15 or the comprehensive plating mode that cuts face, with each electrode selectivity vertical conducting of distinguishing is continuous up and down.Afterwards, between the mesozone of the electrode of top and bottom, can general anti-welding coating coating cause the insulation effect, shown in 24a, 24b among the figure.
As shown in Figure 1, the conduction material 20 on the via 13 couples up and down two tinsels 16 and first and conducts electricity structure material 12a; Conduction material 22 on the via 15 then couples up and down two tinsels 18 and second and conducts electricity structure material 12b.On the hole wall of conductive hole, can utilize electroless-plating or electro-plating method to plate one deck conducting metal (as copper or gold), to reach the purpose that connects upper/lower electrode.The cross sectional shape of conductive hole can be circle, semicircle, 1/4 circle, arc, square, rhombus, rectangle, triangle or polygon, is to be that example is done an explanation with the semicircle in the present embodiment.
With reference to Fig. 3 A, above design and production method, (A, B represent two resistive element assemblies among the figure) carries out connect in parallel more than can increasing wherein the resistive element number of plies to two layer, reach the surface adhering resistive element of Multi-layer Parallel formula, each electrode member coupling on the conduction material 20,22 of via is reached electrically respectively wherein, and isolate mutually by the etching cut-off rule at edge between the conductive member of first electrode and second electrode.Through designing and producing the surface adhesion type PTC element that forms thus, its surface length is 4.5 millimeters, wide 3.1 millimeters, and 1.1 millimeters of gross thickness include two-layer PTC element and are connect in parallel (its benefit figure in parallel is shown in Fig. 3 B), and the result is as follows for its electrical characteristics test:
| From the beginning of resistance (Ω) | Through Hui Han @260 ℃, back resistance value (Ω) on 20 seconds adhesion circuit boards | After the power off periods test, resistance value (Ω) | |||
| 1 | 10 cycles | 100 cycles | 500 cycles | ||
| 0.059 | 0.086 | 0.097 | 0.085 | 0.082 | 0.089 |
The power off periods test condition:
Power end 7VDC, the 40A:1 cycle; (on time) 6sec when opening, (off time) 60sec during pass.
Claims (20)
1, a kind of surface adhering electric device is characterized in that: comprising:
(1) sheet-type resistive element, formed by having the macromolecular material that conducting particles is scattered in wherein, this has the sheet-type resistive element of positive temperature or negative temperature coefficient character, have opposite first and second surface, also have the first relative end face and second end face, this first end face and second end face are to extend to second surface from first surface respectively;
(2) first conductive members are arranged at the first surface of this sheet-type resistive element, and extend to first end face;
(3) second conductive members are arranged at the second surface of this sheet-type resistive element, and extend to second end face;
(4) first dielectric films are arranged on this first conductive member, and extend to second end face of this sheet-type resistive element;
(5) second dielectric films are arranged on this second conductive member, and extend to first end face of this sheet-type resistive element;
(6) first electrodes comprise a main part and a junction; The main part of this first electrode comprises the pair of metal paillon foil, is to be divided on first dielectric film and second dielectric film; The connecting portion of this first electrode comprises a conducting film, is to couple this to tinsel and this first conductive member along first end face; And
(7) second electrodes comprise a main part and a junction; The main part of this second electrode comprises the pair of metal paillon foil, is to be divided on first dielectric film and second dielectric film; The connecting portion of this second electrode comprises a conducting film, is to couple this to tinsel and this second conductive member along second end face.
2. surface adhering electric device as claimed in claim 1 is characterized in that: this macromolecular material is to select from polyethylene, and polypropylene gathers fluorine alkene, reaches the mixture and the co-polymer of polyethylene, polypropylene, poly-fluorine alkene.
3, surface adhering electric device as claimed in claim 1, it is characterized in that: this conducting particles is to select from metallic, carbon contg particle, metal oxide, metal carbides, and the mixture of metallic, carbon contg particle, metal oxide, metal carbides.
4, surface adhering electric device as claimed in claim 1 is characterized in that: the material of described conductive member is to select from nickel, copper, and zinc, silver, gold reaches nickel, copper, zinc, silver, golden alloy or the multilayer material of being formed.
5, surface adhering electric device as claimed in claim 1 is characterized in that: described dielectric film is a then property glued membrane.
6, surface adhering electric device as claimed in claim 5 is characterized in that: described dielectric film is the made then property glued membrane of epoxy resin and glass fabric.
7. surface adhering electric device as claimed in claim 1 is characterized in that: described tinsel is a Copper Foil.
8. surface adhering electric device as claimed in claim 1 is characterized in that: described conducting film is copper or the gold that is plated to electroless-plating or electro-plating method.
9. surface adhering electric device as claimed in claim 1 is characterized in that: also comprise:
(8) a pair of insulating element that first electrode and second electrode are isolated mutually is to be divided on first dielectric film and second dielectric film.
10. surface adhering electric device as claimed in claim 9 is characterized in that: this insulating element is an anti-welding coating.
11. a surface adhering electric device is characterized in that: comprising:
(A) the first resistance assembly comprises:
(1) sheet-type resistive element is scattered in wherein macromolecule material by having conducting particles
Material is formed; This has the sheet-type resistive element tool of positive temperature or negative temperature coefficient character
Opposite first and second surface are arranged, also have the first relative end face and second end
Face, this first end face and second end face are to extend to second surface from first surface respectively;
(2) first conductive members are to be arranged at this to approach the first surface of pulling the type resistive element,
And extend to first end face;
(3) second conductive members are the second surfaces that are arranged at this sheet-type resistive element,
And extend to second end face;
(4) first dielectric films are to be arranged on this first conductive member, and extend to this thin plate
Second end face of type resistive element;
(5) second dielectric films are to be arranged on this second conductive member, and extend to this thin plate
First end face of type resistive element;
(B) at least one second resistance assembly identical with the first resistance assembly, this second resistance assembly is to be stacked on the described first resistance assembly;
(C) first electrode comprises a main part and a junction, and the main part of this first electrode comprises the pair of metal paillon foil, is to be divided on the first resistance assembly and the second resistance assembly; This connecting portion comprises a conducting film, is to couple this to the tinsel and first conductive member along first end face; And
(D) second electrode comprises a main part and a junction, and the main part of this second electrode comprises the pair of metal paillon foil, is to be divided on the first resistance assembly and the second resistance assembly; This connecting portion comprises a conducting film, is to couple this to the tinsel and second conductive member along second end face.
12. surface adhering electric device as claimed in claim 11 is characterized in that: this macromolecular material is to select from polyethylene, and polypropylene gathers fluorine alkene, reaches the mixture and the co-polymer of polyethylene, polypropylene, poly-fluorine alkene.
13. surface adhering electric device as claimed in claim 11, it is characterized in that: this conducting particles is to select from metallic, carbon contg particle, metal oxide, metal carbides, and the mixture of metallic, carbon contg particle, metal oxide, metal carbides.
14. surface adhering electric device as claimed in claim 11 is characterized in that: the material of described conductive member is to select from nickel, copper, and zinc, silver, gold reaches nickel, copper, zinc, silver, golden alloy or the multilayer material of being formed.
15. surface adhering electric device as claimed in claim 11 is characterized in that: this dielectric film is a then property glued membrane.
16. surface adhering electric device as claimed in claim 15 is characterized in that: described dielectric film is the made then property glued membrane of epoxy resin and glass fabric.
17. surface adhering electric device as claimed in claim 11 is characterized in that: described tinsel is a Copper Foil.
18. surface adhering electric device as claimed in claim 11 is characterized in that: described conducting film is copper or the gold that is plated to electroless-plating or electro-plating method.
19. surface adhering electric device as claimed in claim 11 is characterized in that: also comprise:
(E) a pair of insulating element that first electrode and second electrode are isolated mutually is to be divided on the first resistance assembly and the second resistance assembly.
20. surface adhering electric device as claimed in claim 19 is characterized in that: this insulating element is an anti-welding coating.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 00257994 CN2470923Y (en) | 2000-10-19 | 2000-10-19 | Surface-adhesive electric appliance |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 00257994 CN2470923Y (en) | 2000-10-19 | 2000-10-19 | Surface-adhesive electric appliance |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2470923Y true CN2470923Y (en) | 2002-01-09 |
Family
ID=33614402
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 00257994 Expired - Lifetime CN2470923Y (en) | 2000-10-19 | 2000-10-19 | Surface-adhesive electric appliance |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2470923Y (en) |
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7701322B2 (en) | 2005-12-27 | 2010-04-20 | Polytronics Technology Corp. | Surface-mounted over-current protection device |
| US8044763B2 (en) | 2005-12-27 | 2011-10-25 | Polytronics Technology Corp. | Surface-mounted over-current protection device |
| CN102779595A (en) * | 2011-05-12 | 2012-11-14 | 聚鼎科技股份有限公司 | Overcurrent and overtemperature protection element |
| USRE44224E1 (en) | 2005-12-27 | 2013-05-21 | Polytronics Technology Corp. | Surface-mounted over-current protection device |
| CN103247399A (en) * | 2012-02-07 | 2013-08-14 | 聚鼎科技股份有限公司 | Surface tack thermistor element |
| CN103680780A (en) * | 2012-09-06 | 2014-03-26 | 聚鼎科技股份有限公司 | Surface-mounted overcurrent protection element |
| CN103714924A (en) * | 2012-09-28 | 2014-04-09 | 聚鼎科技股份有限公司 | Surface-mounted overcurrent protection element |
| CN103794304A (en) * | 2012-10-31 | 2014-05-14 | 聚鼎科技股份有限公司 | Surface-mounted overcurrent protection element |
| CN109494034A (en) * | 2017-09-12 | 2019-03-19 | 力特有限公司 | There is the PPTC material of low percolation threshold to conductive filler |
| CN109637762A (en) * | 2017-09-12 | 2019-04-16 | 力特有限公司 | The PPTC material formed with mixed conductive filler |
-
2000
- 2000-10-19 CN CN 00257994 patent/CN2470923Y/en not_active Expired - Lifetime
Cited By (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8044763B2 (en) | 2005-12-27 | 2011-10-25 | Polytronics Technology Corp. | Surface-mounted over-current protection device |
| USRE44224E1 (en) | 2005-12-27 | 2013-05-21 | Polytronics Technology Corp. | Surface-mounted over-current protection device |
| US7701322B2 (en) | 2005-12-27 | 2010-04-20 | Polytronics Technology Corp. | Surface-mounted over-current protection device |
| CN102779595B (en) * | 2011-05-12 | 2015-05-20 | 聚鼎科技股份有限公司 | Overcurrent and overtemperature protection element |
| CN102779595A (en) * | 2011-05-12 | 2012-11-14 | 聚鼎科技股份有限公司 | Overcurrent and overtemperature protection element |
| CN103247399A (en) * | 2012-02-07 | 2013-08-14 | 聚鼎科技股份有限公司 | Surface tack thermistor element |
| CN103680780A (en) * | 2012-09-06 | 2014-03-26 | 聚鼎科技股份有限公司 | Surface-mounted overcurrent protection element |
| CN103714924A (en) * | 2012-09-28 | 2014-04-09 | 聚鼎科技股份有限公司 | Surface-mounted overcurrent protection element |
| CN103794304A (en) * | 2012-10-31 | 2014-05-14 | 聚鼎科技股份有限公司 | Surface-mounted overcurrent protection element |
| CN103794304B (en) * | 2012-10-31 | 2016-12-28 | 聚鼎科技股份有限公司 | Surface-mounted overcurrent protection element |
| CN109494034A (en) * | 2017-09-12 | 2019-03-19 | 力特有限公司 | There is the PPTC material of low percolation threshold to conductive filler |
| CN109637762A (en) * | 2017-09-12 | 2019-04-16 | 力特有限公司 | The PPTC material formed with mixed conductive filler |
| US10777340B2 (en) | 2017-09-12 | 2020-09-15 | Littelfuse, Inc. | PPTC material with mixed conductive filler composition |
| US10878980B2 (en) | 2017-09-12 | 2020-12-29 | Littelfuse, Inc. | PPTC material with low percolation threshold for conductive filler |
| CN109494034B (en) * | 2017-09-12 | 2021-10-22 | 力特有限公司 | PPTC material with low percolation threshold for conductive filler |
| US11763968B2 (en) | 2017-09-12 | 2023-09-19 | Littelfuse, Inc. | PPTC material with low percolation threshold for conductive filler |
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Expiration termination date: 20101019 Granted publication date: 20020109 |