CN101315823A - Production method of overcurrent production element - Google Patents
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- CN101315823A CN101315823A CNA2007101107114A CN200710110711A CN101315823A CN 101315823 A CN101315823 A CN 101315823A CN A2007101107114 A CNA2007101107114 A CN A2007101107114A CN 200710110711 A CN200710110711 A CN 200710110711A CN 101315823 A CN101315823 A CN 101315823A
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Abstract
The invention discloses a manufacturing method of an overcurrent protective element, which comprises the following steps: (1) at least one current sensing element is provided, and the current sensing element includes at least one crystalline high polymer and a positive temperature coefficient conducting material layer of an conducting stuffing; and (2) under the preset temperature, each current sensing element is pressurized to cause the side edge of the positive temperature coefficient conducting material layer to generate at least one overflow part, so as to form the overcurrent protective element, wherein, the preset temperature is higher than the softening point of the positive temperature coefficient conducting material layer. The overcurrent protective element manufactured by the method has better resistance value distribution.
Description
Technical field
The present invention relates to a kind of manufacture method of over-current protecting element, more particularly, relate to a kind of have positive temperature coefficient (positive temperature coefficient, PTC) manufacture method of the over-current protecting element of conducing composite material.
Background technology
Owing to have positive temperature coefficient (Positive Temperature Coefficient; PTC) resistance of the conducing composite material of characteristic has the sharp characteristic of variations in temperature reaction; thereby can be used as the material of current sensing element, and be widely used on over-current protecting element or the circuit element at present.Because the resistance of PTC conducing composite material under normal temperature can be kept utmost point low value, makes circuit or battery be able to normal operation.But when circuit or battery generation overcurrent (over-current) or when crossing the phenomenon of high temperature (over-temperature), its resistance value can be brought up to high resistance state (at least 10 moment
4More than the ohm), and excessive current reversal is offset, to reach the purpose of protection battery or circuit element.
In general, (the volume resistance value is as follows less than the manufacture method of 0.1 Ω-cm) for low-resistance P TC over-current protecting element.At first crystalline polymer polymer (for example high density polyethylene (HDPE) and low density polyethylene (LDPE)) and anaerobic conductivity ceramics powder (for example titanium carbide) are inserted in the mixing roll (for example Hakke-mixer), feeding temperature fixes on 160 ℃, rotating speed with 50rpm mixed 15 minutes, to form ptc material.Again described ptc material is poured out and placed in the hot press, be arranged in the both sides up and down of described ptc material, under 180 ℃, be pressed into the PTC thin slice with the steel plate and teflon (Teflon) demoulding.Then, two electrode foils are placed the both sides up and down of described PTC thin slice respectively.Making thickness 180 ℃ of following pressings is the PTC composite material of 0.45mm to 0.65mm, the i.e. structure of electrode foil/PTC thin slice/electrode foil.Afterwards, utilize mould described structure to be die-cut into the chip (to call over-current protecting element in the following text) of 2.8mm * 3.5mm size.Table one be to use 12 over-current protecting element samples that above-mentioned manufacture method makes open beginning resistance value, size dimension and through 10 cycle lives test (cyclelife test; it applies 12 volts/10 amperes on described over-current protecting element; continue after 10 seconds; interrupted 60 seconds, and so be called 1 circulation) after resistance value.Its open the beginning resistance value distribution by minimum value 0.0101 Ω to maximum 0.0195 Ω, standard deviation is 0.003.In actual low resistance is used, as table one to open beginning resistance variation too big, its distribution (distribution) is still waiting to improve.
Table one
| Sample | Open beginning resistance (Ω) | Width (mm) | Thickness (mm) | Resistance value (Ω) after 10 cycle life tests |
| 1 | 0.0180 | 2.81 | 0.75 | 0.0251 |
| 2 | 0.0146 | 2.83 | 0.73 | 0.0276 |
| 3 | 0.0194 | 2.82 | 0.74 | 0.0258 |
| 4 | 0.0163 | 2.84 | 0.74 | 0.0301 |
| 5 | 0.0195 | 2.84 | 0.75 | 0.0192 |
| 6 | 0.0165 | 2.81 | 0.73 | 0.0226 |
| 7 | 0.0124 | 2.84 | 0.73 | 0.0184 |
| 8 | 0.0101 | 2.83 | 0.73 | 0.0189 |
| 9 | 0.0135 | 2.83 | 0.71 | 0.0283 |
| 10 | 0.0140 | 2.85 | 0.70 | 0.0209 |
| 11 | 0.0119 | 2.85 | 0.69 | 0.0208 |
| 12 | 0.0116 | 2.85 | 0.67 | 0.0221 |
| Mean value | 0.0148 | 2.8333 | 0.7225 | 0.0233 |
| Minimum value | 0.0101 | 2.8100 | 0.6700 | 0.0184 |
| Maximum | 0.0195 | 2.8500 | 0.7500 | 0.0301 |
| Standard deviation | 0.0030 | 0.0137 | 0.0238 | 0.0038 |
The PTC over-current protecting element of high voltage withstanding for being applied to (greater than 250 volts); its manufacture method and above-mentioned low-resistance P TC over-current protecting element manufacture method are similar; be known to the those skilled in the art, only needed the composition and the ratio (for example changing high density polyethylene (HDPE), magnesium hydroxide and carbon black etc. into) of appropriate change ptc material to get final product.In addition, in order to reach high voltage withstanding purpose, its thickness (greater than 2.5mm) is thicker than low-resistance P TC over-current protecting element usually, and also the high voltage withstanding PTC over-current protecting element of therefore making according to said method relatively lacks and opens beginning resistance uniformly.20 high voltage withstanding PTC over-current protecting element samples that table two is to use above-mentioned manufacture method to make open beginning resistance value and thickness.The distribution (standard deviation is 1.814) of wherein opening beginning resistance is inferior to the distribution (standard deviation is 0.003) of table one.
Table two
| Sample | Open beginning resistance (Ω) | Thickness (mm) |
| 1 | 6.83 | 3.58 |
| 2 | 7.75 | 3.56 |
| 3 | 6.93 | 3.59 |
| 4 | 7.58 | 3.56 |
| 5 | 4.55 | 3.46 |
| 6 | 5.84 | 3.44 |
| 7 | 4.51 | 3.43 |
| 8 | 6.90 | 3.54 |
| 9 | 10.18 | 3.57 |
| 10 | 5.49 | 3.48 |
| 11 | 9.94 | 3.57 |
| 12 | 4.64 | 3.51 |
| 13 | 6.03 | 3.52 |
| 14 | 9.64 | 3.56 |
| 15 | 4.73 | 3.50 |
| 16 | 4.25 | 3.51 |
| 17 | 5.89 | 3.59 |
| 18 | 4.37 | 3.49 |
| 19 | 7.23 | 3.58 |
| 20 | 5.55 | 3.51 |
| Mean value | 6.44 | 3.53 |
| Standard deviation | 1.814 | 0.049 |
| Maximum | 10.18 | 3.59 |
| Minimum value | 4.25 | 3.43 |
Summary of the invention
Main purpose of the present invention provides a kind of manufacture method of over-current protecting element; by the pressurization steps under the particular preset temperature; make the side of the PTC conductive material layer at least one over-current protecting element generate at least one overflow part, to improve the distribution that described at least one over-current protecting element opens beginning resistance.
In order to achieve the above object, the present invention discloses a kind of manufacture method of over-current protecting element, and it comprises provides at least one current sensing element and pressurization steps.Described current sensing element comprises first electrode foil, second electrode foil and positive temperature coefficient (PTC) conductive material layer, its physical engagement in described first and described second electrode foil between, and comprise at least one crystalline polymer polymer and conducting filler.Described pressurization steps is under preset temperature; each described current sensing element of pressurizeing makes the side of described PTC conductive material layer generate at least one overflow part to form described over-current protecting element; wherein said preset temperature is higher than the softening point (fusing point that preferably, is higher than described PTC conductive material layer) of described PTC conductive material layer.Described first and second electrode foils contain the outstanding rough surface of warty (nodule), and contact with described PTC conductive material layer direct physical.
In another embodiment, described current sensing element further comprises first conducting strip that is arranged on described first electrode foil outside and second conducting strip that is arranged on described second electrode foil outside.The particle size of described anaerobic conductivity ceramics powder between 0.01 μ m between the 30 μ m, the preferable particle size size between 0.1 μ m between the 10 μ m, the volume resistance value of described anaerobic conductivity ceramics powder is less than 500 μ Ω-cm, and is dispersed among described at least one crystalline polymer polymer.Described a plurality of crystalline polymer polymer can be selected from: high density polyethylene (HDPE), low density polyethylene (LDPE), polypropylene, polyvinyl fluoride and its co-polymer.Described over-current protecting element has preferable distribution of resistance; (the volume resistance value is less than 0.1 Ω-over-current protecting element cm) and the over-current protecting element of high voltage withstanding (greater than 250 volts) to be applicable to the making low resistance.
Description of drawings
Fig. 1 is the flow chart of over-current protecting element manufacture method of the present invention;
Fig. 2 (a) and 2 (b) are the diagram flow processs of Fig. 1;
Fig. 3 (a)～3 (c) shows the making flow process of the over-current protecting element of the present invention first and second embodiment; With
Fig. 4 (a) and 4 (b) are the diagram flow processs of third embodiment of the invention.
Embodiment
The various embodiment of over-current protecting element manufacture method of the present invention below are described.Fig. 1 is the flow chart of over-current protecting element manufacture method of the present invention.Fig. 2 (a) and 2 (b) are the diagram flow processs of Fig. 1.At least one current sensing element 10 (step S10) at first is provided.The preparation method of described current sensing element 10 is as follows.To criticize formula mixing roll (Hakke-mixer) feeding temperature and fix on 160 ℃, add at least one crystalline polymer polymer (being high density polyethylene (HDPE) (HDPE) 4.8 grams, low density polyethylene (LDPE) (LDPE) 9.8 grams in the present embodiment) and conducting filler (being titanium carbide (TiC) 117.6 grams in the present embodiment), rotating speed with 50rmp mixed 15 minutes, to form ptc material.Then, described ptc material poured out place in the hot press, be arranged in the both sides up and down of described ptc material, under 180 ℃, be pressed into PTC conductive material layer 11 with the steel plate and the teflon demoulding.Afterwards, two electrode foils 12 and 12 ' are respectively placed the both sides up and down of described PTC conductive material layer 11.Making thickness 180 ℃ of following pressings is the PTC composite material of 0.45mm to 0.65mm, the i.e. structure of electrode foil/PTC thin slice/electrode foil.Then, utilize mould described structure die-cut (punch) to be become the chip (being current sensing element 10) of 2.8mm * 3.5mm size.After the step S10; at the softening point temperature that is higher than PTC conductive material layer 11 (preferably; the melting temperature that can be higher than PTC conductive material layer 11); pump current sensing element 10; make the side of PTC conductive material layer 11 generate at least one overflow part 13, to form over-current protecting element 10 ' (step S20).The area of each overflow part 13 is less than the area of the described PTC chip (being current sensing element 10) at its place.
In first embodiment of the invention, the detailed step of step S20 is described below.Referring to Fig. 3 (a), at first the current sensing element 10 that will finish in step S10 is placed in the groove 15 that holds tool 14, and described groove 15 has constant depth D1 and the described constant depth D1 thickness D2 less than current sensing element 10.Referring to Fig. 3 (b), then with thermal head (hot bar) 16 to be higher than 195 ℃ temperature and greater than 2.5MPa (2.5 * 10
6Pa) pressure is applied to current sensing element 10 tops, is compressed to constant depth D1 up to the thickness D2 of current sensing element 10, and continues 5 seconds.Whereby, part PTC conductive material layer 11 will be extruded and overflow electrode foil 12 or 12 ' and generate at least one overflow part 13, and form current protection element 10 '.
Second embodiment of the invention is implemented the mode that Fig. 3 among first embodiment (b) (being step S20) changes Fig. 3 (c) into, and its method is as follows.The current sensing element 10 that in step S10, finish be placed on thermal head 16 ' on, and at two distance pieces (spacer) 17 with level altitude D3 of current sensing element 10 both sides placement, wherein said level altitude D3 is less than the thickness D2 of current sensing element 10.Utilize another thermal head 16 again and ", be compressed to constant depth D3 up to the thickness D2 of current sensing element 10, and continue 5 seconds to be higher than 195 ℃ temperature and to be applied to current sensing element 10 tops greater than the pressure of 2.5MPa.Whereby, part PTC conductive material layer 11 will be extruded and overflow electrode foil 12 or 12 ', generate at least one overflow part 13, and form over-current protecting element 10 '.
In third embodiment of the invention, the detailed step of step S20 is described below.Referring to Fig. 4 (a), at first the current sensing element 10 that will in step S10, finish be placed on the groove 18 that holds tool 18 ' in, described groove 18 ' have constant depth D5 and described constant depth D5 are greater than the thickness D2 of current sensing element 10.Afterwards, utilize a plurality of locking parts 19 that loam cake 20 is locked above described appearance tool 18, make to have gap 18 between loam cake 20 and the current sensing element 10 ".Referring to Fig. 4 (b), then will hold tool 18 and put into oven heat (oven) together with loam cake 20 and current sensing element 10, be heated to 140 ℃ and kept at least 3 hours.(promptly expanding on first direction) is because of being subjected to the restriction of constant depth D5 behind current sensing element 10 expanded by heating; its thickness will be equivalent to constant depth D5 and part PTC conductive material layer 11 will be extruded (promptly with the orthogonal second direction of first direction on be extruded) and overflow electrode foil 12 or 12 '; generate at least one overflow part 13, thus formation over-current protecting element 10 '.
The diagram of the various embodiments described above is an example with single current sensing element all.Yet, in fact can place a plurality of current sensing element and carry out pressurization steps (being step S20) simultaneously.After carrying out pressurization steps simultaneously at a plurality of current sensing element, its formed a plurality of current protection elements have identical thickness.In addition, can be earlier before carrying out pressurization steps the current sensing element of Fig. 2 (a) both sides about in the of 10 (be electrode foil 12 and 12 ' the outside) be provided with conducting strip respectively, its electrode foil 12 and 12 ' the outside smear tin cream earlier and utilize back welding process (reflow process) to finish again.
Table three be to use 12 over-current protecting element samples that the manufacture method of the over-current protecting element of first embodiment of the invention makes open beginning resistance value, size dimension and through 10 cycle lives test (cycle life test; it applies 12 volts/10 amperes on described over-current protecting element; continue after 10 seconds; interrupted 60 seconds; so be called 1 circulation) after resistance value, its employed sample is the over-current protecting element in the table one to be bestowed pressurization steps (being step S20) back again and the over-current protecting element that forms.Table three sample open the beginning resistance value distribution by minimum value 0.0074 Ω to maximum 0.0089 Ω, on average opening beginning resistance is 0.0083 Ω (standard deviation is 0.0004), is better than resistance 0.0148 Ω (standard deviation is 0.003) that begins of on average opening in the table one.In addition, the resistance mean value after 10 cycle life tests is 0.0098 Ω (standard deviation is 0.0003), is better than resistance mean value 0.0233 Ω (standard deviation is 0.0038) after 10 cycle life tests in the table one.Last hurdle of table three shows that then the volume resistance value of described 12 over-current protecting element samples all is significantly less than 0.1 Ω-cm.
Table three
| Sample | Open beginning resistance (Ω) | Width (mm) | Thickness (mm) | Resistance value (Ω) after 10 cycle life tests | The volume resistance value (Ω-cm) |
| 1 | 0.0083 | 3.02 | 0.54 | 0.0095 | 0.0151 |
| 2 | 0.0082 | 3.03 | 0.53 | 0.0094 | 0.0152 |
| 3 | 0.0082 | 3.01 | 0.53 | 0.0099 | 0.0152 |
| 4 | 0.0074 | 3.03 | 0.53 | 0.0098 | 0.0137 |
| 5 | 0.0089 | 3.01 | 0.53 | 0.0104 | 0.0165 |
| 6 | 0.0083 | 3.08 | 0.53 | 0.0096 | 0.0153 |
| 7 | 0.0086 | 3.04 | 0.53 | 0.0095 | 0.0159 |
| 8 | 0.0087 | 3.15 | 0.53 | 0.0097 | 0.0161 |
| 9 | 0.0086 | 3.12 | 0.53 | 0.0100 | 0.0159 |
| 10 | 0.0082 | 3.02 | 0.52 | 0.0102 | 0.0155 |
| 11 | 0.0081 | 3.03 | 0.52 | 0.0099 | 0.0153 |
| 12 | 0.0080 | 3.13 | 0.53 | 0.0097 | 0.0148 |
| Mean value | 0.0083 | 3.0558 | 0.5292 | 0.0098 | 0.0154 |
| Minimum value | 0.0074 | 3.0100 | 0.5200 | 0.0094 | 0.0137 |
| Maximum | 0.0089 | 3.1500 | 0.5400 | 0.0104 | 0.0165 |
| Standard deviation | 0.0004 | 0.0484 | 0.0049 | 0.0003 | 0.0007 |
20 high voltage withstanding (greater than 250 volts) PTC over-current protecting element samples that table four is to use the manufacture method of the over-current protecting element of third embodiment of the invention to make open beginning resistance value and thickness, the standard deviation that wherein opens beginning resistance is 0.772.PTC electric conducting material in table four sample comprises high density polyethylene (HDPE) 21.84 grams, magnesium hydroxide 17.92 grams and carbon black 16.24 grams etc., and its manufacture method is except pressurization steps S20, and is identical with the manufacture method of sample in the table two.
Table four
| Sample | Open beginning resistance (Ω) | Thickness (mm) |
| 1 | 6.20 | 3.51 |
| 2 | 6.63 | 3.45 |
| 3 | 5.92 | 3.46 |
| 4 | 6.74 | 3.48 |
| 5 | 5.94 | 3.41 |
| 6 | 8.62 | 3.51 |
| 7 | 7.66 | 3.50 |
| 8 | 6.96 | 3.47 |
| 9 | 7.19 | 3.50 |
| 10 | 6.64 | 3.48 |
| 11 | 7.82 | 3.51 |
| 12 | 6.16 | 3.51 |
| 13 | 7.17 | 3.51 |
| 14 | 7.57 | 3.50 |
| 15 | 7.62 | 3.52 |
| 16 | 6.13 | 3.51 |
| 17 | 5.67 | 3.53 |
| 18 | 6.17 | 3.51 |
| 19 | 6.70 | 3.52 |
| 20 | 5.91 | 3.46 |
| Mean value | 6.77 | 3.49 |
| Standard deviation | 0.772 | 0.029 |
| Maximum | 8.62 | 3.53 |
| Minimum value | 5.67 | 3.41 |
Comparison sheet three and table one and comparison sheet four and table two are as can be known, compare with the low resistance over-current protecting element that conventional method is made, the low resistance over-current protecting element that utilizes the present invention to make has preferable beginning distribution of resistance, preferable beginning resistance value and the preferable resistance value after the cycle life test of opening of opening; The high voltage resistant over-current protective element that utilizes the present invention to make has the preferable beginning distribution of resistance that opens.Therefore, the manufacture method of over-current protecting element of the present invention really can reach intended purposes of the present invention.
Technology contents of the present invention and technical characterstic disclose as above, yet the those skilled in the art still may be based on teaching of the present invention and announcement and done all replacement and modifications that does not break away from spirit of the present invention.Therefore, protection scope of the present invention should be not limited to those disclosed embodiments, and should comprise various do not break away from replacement of the present invention and modifications, and is contained by appended claims.
Claims (19)
1. the manufacture method of an over-current protecting element is characterized in that comprising following steps:
At least one current sensing element is provided, described current sensing element comprise first electrode foil, second electrode foil and physical engagement in described first and described second electrode foil between positive temperature coefficient (PTC) conductive material layer, described PTC conductive material layer comprises at least one crystalline polymer polymer and conducting filler; With
Under preset temperature, the described current sensing element of pressurizeing makes the side of described PTC conductive material layer generate at least one overflow part and form described over-current protecting element.
2. the manufacture method of over-current protecting element according to claim 1 is characterized in that described preset temperature is higher than the softening point of described PTC conductive material layer.
3. the manufacture method of over-current protecting element according to claim 1 is characterized in that described preset temperature is higher than the fusing point of described PTC conductive material layer.
4. the manufacture method of over-current protecting element according to claim 1 is characterized in that the area of the area of described overflow part less than its described current sensing element in place.
5. the manufacture method of over-current protecting element according to claim 1 is characterized in that described current sensing element further comprises:
First conducting strip is arranged on the outside of described first electrode foil; With
Second conducting strip is arranged on the outside of described second electrode foil.
6. the manufacture method of over-current protecting element according to claim 1 is characterized in that described current sensing element forms through die-cut.
7. the manufacture method of over-current protecting element according to claim 1 is characterized in that the step of described pump current sensing element comprises:
Described current sensing element is placed in the appearance tool with constant depth, and described constant depth is less than the thickness of described current sensing element; With
Use thermal head to apply pressure to described first electrode foil, so that the thickness of described current sensing element is compressed to described constant depth.
8. the manufacture method of over-current protecting element according to claim 1; the step that it is characterized in that described pump current sensing element uses two thermal heads to apply pressure to first and second electrode foils of described current sensing element respectively, so that described current sensing element is compressed to fixed thickness.
9. the manufacture method of over-current protecting element according to claim 8, it is characterized in that described fixed thickness less than
The original thickness of described current sensing element.
10. the manufacture method of over-current protecting element according to claim 1; the step utilization that it is characterized in that described pump current sensing element is limited to the thermal expansion on first direction of described current sensing element and and on perpendicular to the second direction of first direction described PTC conductive material layer extruding is generated described at least one overflow part to fixed thickness.
11. the manufacture method of over-current protecting element according to claim 10 is characterized in that the original thickness of described fixed thickness greater than described current sensing element.
12. the manufacture method of over-current protecting element according to claim 1, the volume resistance value that it is characterized in that described current sensing element is less than 0.1 Ω-cm.
13. the manufacture method of over-current protecting element according to claim 12 is characterized in that described crystalline polymer polymer comprises high density polyethylene (HDPE) and low density polyethylene (LDPE).
14. the manufacture method of over-current protecting element according to claim 12 is characterized in that described conducting filler is a titanium carbide.
15. the manufacture method of over-current protecting element according to claim 1 is characterized in that voltage that described current sensing element can bear is more than or equal to 250 volts.
16. the manufacture method of over-current protecting element according to claim 15 is characterized in that described crystalline polymer polymer comprises high density polyethylene (HDPE).
17. the manufacture method of over-current protecting element according to claim 15 is characterized in that described conducting filler is a carbon black.
18. the manufacture method of over-current protecting element according to claim 1 is characterized in that each described over-current protecting element has identical thickness.
19. the manufacture method of over-current protecting element according to claim 1, the pressure of step that it is characterized in that described pump current sensing element is greater than 2.5MPa.
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| CNA2007101107114A CN101315823A (en) | 2007-06-01 | 2007-06-01 | Production method of overcurrent production element |
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| CNA2007101107114A CN101315823A (en) | 2007-06-01 | 2007-06-01 | Production method of overcurrent production element |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103021604A (en) * | 2012-12-11 | 2013-04-03 | 厦门莱纳电子有限公司 | High voltage resisting level high molecular PTC (Positive Temperature Coefficient) thermistor and manufacturing method thereof |
| CN103594215A (en) * | 2013-11-13 | 2014-02-19 | 兴勤（常州）电子有限公司 | Composite type polymer thermistor |
| CN105264545A (en) * | 2013-06-03 | 2016-01-20 | 高通股份有限公司 | Ultrasonic receiver with coated piezoelectric layer |
| CN105590710A (en) * | 2014-10-22 | 2016-05-18 | 富致科技股份有限公司 | Positive temperature coefficient over-current protection component |
| CN106601393A (en) * | 2015-10-20 | 2017-04-26 | 富致科技股份有限公司 | Positive temperature coefficient (PTC) current protection chip device and fabrication method thereof |
| US10036734B2 (en) | 2013-06-03 | 2018-07-31 | Snaptrack, Inc. | Ultrasonic sensor with bonded piezoelectric layer |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103021604A (en) * | 2012-12-11 | 2013-04-03 | 厦门莱纳电子有限公司 | High voltage resisting level high molecular PTC (Positive Temperature Coefficient) thermistor and manufacturing method thereof |
| CN105264545A (en) * | 2013-06-03 | 2016-01-20 | 高通股份有限公司 | Ultrasonic receiver with coated piezoelectric layer |
| US10036734B2 (en) | 2013-06-03 | 2018-07-31 | Snaptrack, Inc. | Ultrasonic sensor with bonded piezoelectric layer |
| US10341782B2 (en) | 2013-06-03 | 2019-07-02 | Qualcomm Incorporated | Ultrasonic receiver with coated piezoelectric layer |
| CN103594215A (en) * | 2013-11-13 | 2014-02-19 | 兴勤（常州）电子有限公司 | Composite type polymer thermistor |
| CN103594215B (en) * | 2013-11-13 | 2016-08-17 | 兴勤（常州）电子有限公司 | A kind of composite type polymer thermistor |
| CN105590710A (en) * | 2014-10-22 | 2016-05-18 | 富致科技股份有限公司 | Positive temperature coefficient over-current protection component |
| CN106601393A (en) * | 2015-10-20 | 2017-04-26 | 富致科技股份有限公司 | Positive temperature coefficient (PTC) current protection chip device and fabrication method thereof |
| US11003884B2 (en) | 2016-06-16 | 2021-05-11 | Qualcomm Incorporated | Fingerprint sensor device and methods thereof |
| CN108389669A (en) * | 2018-01-26 | 2018-08-10 | 上海神沃电子有限公司 | A kind of preparation method of double-pressure type PTC self- recoverage safety devices |
| CN108389669B (en) * | 2018-01-26 | 2019-08-20 | 上海神沃电子有限公司 | A kind of preparation method of double-pressure type PTC self- recoverage safety device |
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