Double bridge wire ignition resistor and its manufacturing process

Abstract

The invention discloses a double bridge wire ignition resistor and a manufacturing process thereof, comprising a substrate, an alloy heating layer and a welding copper foil layer respectively pressed on the front and back sides of the substrate, wherein the alloy heating layer, the substrate and the welding copper foil layer together constitute a foil substrate; a plurality of through holes and a plurality of blind holes are provided on the foil substrate, a first connection copper layer is plated in each of the plurality of through holes, a second connection copper layer is plated on the two opposite sides of the foil substrate, a third connection copper layer is plated on the front of the alloy heating layer, and the first connection copper layer, the second connection copper layer, the third connection copper layer, the alloy heating layer and the welding copper foil layer are interconnected; a pair of bridge wires is also made on the alloy heating layer, a welding pattern is also made on the welding copper foil layer, and a nickel-gold layer is plated in each of the second connection copper layer, the third connection copper layer, the welding copper foil layer and a plurality of blind holes. The ignition resistor has the advantages of good welding performance, long service life, high ignition success rate, high work safety, wide application range, etc.

Description

Technical Field

[0001] The invention relates to the technical field of heaters, and specifically provides a double-bridge-wire ignition resistor and a manufacturing process thereof. Background Art

[0002] At present, the most common heating device on the market is the metal wire heater, and its working principle is: the current output by the external power supply is applied to the resistance metal wire of the heater through the metal foot wire, the current heats the metal wire, and the heated metal wire can provide heat to the outside world.

[0003] However, the above-mentioned metal wire heater products have the following shortcomings when used: ① The heater products have high power consumption, low precision, and are easily damaged by external forces; ② The heater products have a limited ignition success rate, which not only has an adverse effect on their reliability and safety during operation, but also greatly limits their scope of application.

[0004] In view of this, the present invention is proposed. Summary of the invention

[0005] In order to overcome the above-mentioned defects, the present invention provides a double-bridge wire ignition resistor and a manufacturing process thereof. The manufacturing process is simple and reliable, and the ignition resistor manufactured by the manufacturing process has the advantages of novel and reasonable structure, good welding performance, long service life, high ignition success rate, high working reliability and safety, and a wide range of applications.

[0006] The technical solution adopted by the present invention to solve its technical problems is: a double bridge wire ignition resistor, comprising a substrate, an alloy heating layer and a welding copper foil layer, wherein the alloy heating layer and the welding copper foil layer are respectively fixed and pressed on the front and back surfaces of the substrate through a colloid layer, and the alloy heating layer, the substrate and the welding copper foil layer also together constitute a foil substrate; a plurality of through holes and a plurality of blind holes are arranged on the foil substrate, and the two ends of the plurality of through holes respectively penetrate the alloy heating layer and the welding copper foil layer, one end of the plurality of blind holes respectively penetrates the alloy heating layer, and the other ends of the plurality of blind holes respectively extend to the front of the substrate, and the first connecting copper layer is plated in the plurality of through holes, the second connecting copper layer is plated on the two opposite sides of the foil substrate, and the third connecting copper layer is plated on the front of the alloy heating layer, and the plurality of the first connecting copper layers, the two second connecting copper layers, the third connecting copper layer, the alloy heating layer and the welding copper foil layer are interconnected;

[0007] In addition, pairs of bridge wires are made on the alloy heating layer, a welding pattern is made on the welding copper foil layer, and nickel-gold layers are plated on the second connecting copper layer, the third connecting copper layer, the welding copper foil layer and the plurality of blind holes, respectively.

[0008] As a further improvement of the present invention, the substrate is made of high temperature resistant epoxy glass fiber cloth or ceramic substrate, and the thickness of the substrate is 200 to 600 μm;

[0009] The thickness of the alloy heating layer is 2-10 μm; the thickness of the welding copper foil layer is 5-50 μm.

[0010] As a further improvement of the present invention, one end of each of the plurality of blind holes is exposed outside the third connecting copper layer;

[0011] The thickness of the nickel-gold layer on the second connection copper layer, the third connection copper layer and the welding copper foil layer is consistent, and is 1 to 30 μm.

[0012] The present invention also provides a manufacturing process of the double-bridge wire ignition resistor, which is carried out according to the following steps:

[0013] Step 1), prepare a substrate, and apply a colloid layer on the front and back sides of the substrate respectively;

[0014] Step 2), stacking an alloy heating layer on the colloid layer on the front side, and stacking a soldering copper foil layer on the other colloid layer on the back side, and performing high-temperature pressing after stacking and layout to obtain a foil-coated substrate;

[0015] Step 3), firstly, a plurality of through holes and a plurality of blind holes are processed on the foil substrate according to the design requirements, wherein the two ends of the plurality of through holes respectively pass through the alloy heating layer and the welding copper foil layer, and the two ends of the plurality of blind holes respectively pass through the alloy heating layer and the colloid layer located on the front side, that is, the plurality of blind holes all use the front side of the substrate as the bottom side; then, the two opposite sides of the foil substrate are cut to obtain two trimmed sides;

[0016] Then, the plurality of through holes, the two trimmed sides, and the front side of the alloy heating layer are partially metallized, so that the first connection copper layer is plated in the plurality of through holes, the second connection copper layer is plated on the two trimmed sides, and the third connection copper layer is plated on the front side of the alloy heating layer, and the plurality of the first connection copper layers, the two second connection copper layers, the third connection copper layer, the alloy heating layer and the welding copper foil layer are interconnected; in addition, during the above-mentioned metallization process, it is necessary to ensure that one end of the plurality of blind holes is exposed outside the third connection copper layer;

[0017] Step 4), making a bridge wire pattern on the alloy heating layer, wherein the bridge wire pattern has a plurality of pairs of bridge wires; and making a welding pattern on the welding copper foil layer to obtain a semi-finished ignition resistor;

[0018] Step 5), cutting the semi-finished ignition resistor into a plurality of sheets, each of which has a pair of bridge wires; and then plating the second connecting copper layer, the third connecting copper layer, the welding copper foil layer and the plurality of blind holes of each sheet with a nickel-gold layer, thereby obtaining a finished double-bridge wire ignition resistor.

[0019] As a further improvement of the present invention, the substrate is made of high temperature resistant epoxy glass fiber cloth or ceramic substrate, and the thickness of the substrate is 200 to 600 μm;

[0020] The thickness of the alloy heating layer is 2-10 μm; the thickness of the welding copper foil layer is 5-50 μm.

[0021] As a further improvement of the present invention, the process parameters for the high temperature pressing treatment in step 2) are: pressing temperature 300-400°C, pressing force 20-50Kg / cm 2 , pressing time 5 to 10 hours.

[0022] As a further improvement of the present invention, the size of the tablets is: 1.2 to 2.4 mm in length, 0.6 to 1.4 mm in width;

[0023] The thickness of the nickel-gold layer on the second connection copper layer, the third connection copper layer and the welding copper foil layer is consistent, and is 1 to 30 μm.

[0024] The beneficial effects of the present invention are as follows: the double bridge wire ignition resistor product obtained by the present invention has the following characteristics: ① The product structure is novel and reasonable, the welding performance is good, it is not easily damaged by external forces, and the service life is long; ② The product has paired bridge wires, so when one bridge wire cannot work due to damage, the other bridge wire can work normally, which not only effectively improves the ignition success rate of the ignition resistor, but also effectively improves the reliability and safety of the ignition resistor when working. ③ By combining the alloy heating layer, the second connecting copper layer, the third connecting copper layer and the welding copper foil layer in the product, the metal connection area of ​​the ignition resistor product can be increased, thereby increasing the power of the product, and the power stability and trigger sensitivity can be effectively improved, thereby expanding the scope of application of the product, for example: it can be well applied to high-demand technical fields such as SMT patches, aerospace, etc. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic diagram of the cross-sectional structure of the double-bridge wire ignition resistor of the present invention;

[0026] Figure 2 for Figure 1 The diagram shows a partially enlarged structural diagram of a double-bridge wire ignition resistor.

[0027] Combined with the accompanying drawings, the following description is given:

[0028] 1—substrate; 2—colloid layer; 3—alloy heating layer; 4—welding copper foil layer; 50—first connecting copper layer; 51—second connecting copper layer; 52—third connecting copper layer; 6—nickel-gold layer. DETAILED DESCRIPTION

[0029] The following describes the implementation of the present invention by means of specific embodiments. Those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification.

[0030] It should be noted that the structures, proportions, sizes, etc. illustrated in the drawings of this specification are only used to match the contents disclosed in the specification for people familiar with this technology to understand and read, and are not used to limit the limiting conditions for the implementation of the present invention, so they have no substantial technical significance. Any structural modification, change in proportional relationship or adjustment of size, without affecting the effects and purposes that can be achieved by the present invention, should still fall within the scope of the technical content disclosed by the present invention. The "first", "second" and "third" mentioned in this specification are only for the convenience of description, and are not used to limit the scope of the implementation of the present invention. The change or adjustment of their relative relationship should also be regarded as the scope of the implementation of the present invention without substantially changing the technical content.

[0031] Embodiment 1:

[0032] This embodiment 1 is used to illustrate the specific structure of the double bridge wire ignition resistor of the present invention, as described below:

[0033] Please refer to the attached Figure 1 and attached Figure 2 The figures are respectively a schematic diagram of the cross-sectional structure and a schematic diagram of the local enlarged structure of the double-bridge-wire ignition resistor of the present invention.

[0034] The double bridge wire ignition resistor of the present invention comprises a substrate 1, an alloy heating layer 3 and a welding copper foil layer 4, wherein the alloy heating layer 3 and the welding copper foil layer 4 are respectively fixed and pressed on the front and back surfaces of the substrate 1 through a colloid layer 2, and the alloy heating layer 3, the substrate 1 and the welding copper foil layer 4 also together constitute a foil substrate; in particular, a plurality of through holes and a plurality of blind holes are arranged on the foil substrate, and the two ends of the plurality of through holes respectively penetrate the alloy heating layer 3 and the welding copper foil layer 4, and one end of the plurality of blind holes respectively penetrates the alloy heating layer 3 and the welding copper foil layer 4. The heating layer 3, the other ends of the plurality of blind holes are respectively extended to the front side of the substrate 1 (that is, the plurality of blind holes are based on the front side of the substrate 1 as the bottom side), and the first connecting copper layer 50 is plated in the plurality of through holes, the second connecting copper layer 51 is plated on the two opposite sides of the foil substrate, and the third connecting copper layer 52 is plated on the front side of the alloy heating layer 3, and the plurality of the first connecting copper layers 50, the two second connecting copper layers 51, the third connecting copper layer 52, the alloy heating layer 3 and the welding copper foil layer 4 are interconnected;

[0035] In addition, pairs of bridge wires are also made on the alloy heating layer 3. The shapes of the bridge wires can be designed into I-shape, II-shape, S-shape, M-shape or Ω-shape according to customer requirements, but are not limited to the above shapes. A welding pattern is also made on the welding copper foil layer 4, and nickel-gold layers 6 are respectively plated on the second connecting copper layer 51, the third connecting copper layer 52, the welding copper foil layer 4 and the plurality of blind holes.

[0036] In this embodiment, preferably, the substrate 1 is made of high temperature resistant epoxy glass fiber cloth or ceramic substrate, and the thickness of the substrate 1 is 200-600 μm;

[0037] The thickness of the alloy heating layer 3 is 2-10 μm; the thickness of the welding copper foil layer 4 is 5-50 μm.

[0038] Preferably, one end of each of the blind holes is exposed outside the third connecting copper layer 52;

[0039] The thickness of the nickel-gold layer 6 located on the second connection copper layer 51 , the third connection copper layer 52 and the welding copper foil layer 4 is consistent, and is 1 to 30 μm.

[0040] Embodiment 2:

[0041] This embodiment 2 is used to illustrate the manufacturing process of the double bridge wire ignition resistor of the present invention, as described below:

[0042] The manufacturing process of the double-bridge wire ignition resistor of the present invention is carried out according to the following steps: Step 1), preparing a substrate 1, and coating a colloid layer 2 on the front and back surfaces of the substrate 1 respectively;

[0043] Step 2), stacking an alloy heating layer 3 on the colloid layer 2 on the front side, and stacking a soldering copper foil layer 4 on the other colloid layer 2 on the back side, and performing high-temperature pressing after stacking and layout to obtain a foil-coated substrate;

[0044] Step 3), firstly, according to the design requirements, a plurality of through holes and a plurality of blind holes are processed on the foil substrate, wherein the two ends of the plurality of through holes respectively pass through the alloy heating layer 3 and the welding copper foil layer 4, and the two ends of the plurality of blind holes respectively pass through the alloy heating layer 3 and the colloid layer 2 located on the front side, that is, the plurality of blind holes all use the front side of the substrate 1 as the bottom side; then, the two opposite sides of the foil substrate are cut to obtain two trimmed sides;

[0045] Subsequently, the plurality of through holes, the two trimmed sides, and the front surface of the alloy heating layer 3 are partially metallized, so that the first connection copper layer 50 is plated in the plurality of through holes, the second connection copper layer 51 is plated on the two trimmed sides, and the third connection copper layer 52 is plated on the front surface of the alloy heating layer 3, and the plurality of the first connection copper layers 50, the two second connection copper layers 51, the third connection copper layer 52, the alloy heating layer 3 and the welding copper foil layer 4 are interconnected; in addition, during the above-mentioned metallization process, it is necessary to ensure that one end of the plurality of blind holes is exposed outside the third connection copper layer 52;

[0046] Step 4), making a bridge wire pattern on the alloy heating layer 3, wherein the bridge wire pattern has a plurality of pairs of bridge wires; and making a welding pattern on the welding copper foil layer 4 to obtain a semi-finished ignition resistor;

[0047] Step 5), cutting the semi-finished ignition resistor into a plurality of sheets, each of which has a pair of bridge wires; and then plating the second connecting copper layer 51, the third connecting copper layer 52, the welding copper foil layer 4 and the plurality of blind holes of each sheet with a nickel-gold layer 6, thereby obtaining a finished double-bridge wire ignition resistor.

[0048] In this embodiment, preferably, the substrate 1 is made of high temperature resistant epoxy glass fiber cloth or ceramic substrate, and the thickness of the substrate 1 is 200-600 μm;

[0049] The thickness of the alloy heating layer 3 is 2-10 μm; the thickness of the welding copper foil layer 4 is 5-50 μm.

[0050] In this embodiment, preferably, the process parameters for the high temperature pressing treatment in step 2) are: pressing temperature 300-400°C, pressing force 20-50Kg / cm 2 , pressing time 5 to 10 hours.

[0051] In this embodiment, preferably, the size of the tablet is: length 1.2-2.4 mm, width 0.6-1.4 mm; the size of the tablet can be customized according to customer needs;

[0052] The thickness of the nickel-gold layer 6 located on the second connection copper layer 51 , the third connection copper layer 52 and the welding copper foil layer 4 is consistent, and is 1 to 30 μm.

[0053] In summary, the double bridge wire ignition resistor product obtained by the present invention has the following characteristics: ① The product structure is novel and reasonable, the welding performance is good, it is not easily damaged by external forces, and the service life is long; ② The product has paired bridge wires, so when one bridge wire cannot work due to damage, the other bridge wire can work normally, which not only effectively improves the ignition success rate of the ignition resistor, but also effectively improves the reliability and safety of the ignition resistor when working. ③ By combining the alloy heating layer, the second connecting copper layer, the third connecting copper layer and the welding copper foil layer in the product, the metal connection area of ​​the ignition resistor product can be increased, thereby increasing the power of the product, and the power stability and trigger sensitivity can be effectively improved, thereby expanding the scope of application of the product, for example: it can be well applied to high-demand technical fields such as SMT patches, aerospace, etc.

[0054] The above description is only a preferred embodiment of the present invention, but is not intended to limit the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as within the scope of protection of the present invention.

Claims

1. A double bridge wire ignition resistor, comprising a substrate (1), an alloy heating layer (3) and a soldered copper foil layer (4), wherein the alloy heating layer (3) and the soldered copper foil layer (4) are respectively fixedly pressed onto the front and back surfaces of the substrate (1) via a colloid layer (2), and the alloy heating layer (3), the substrate (1) and the soldered copper foil layer (4) together form a foil substrate; characterized in that: A plurality of through holes and a plurality of blind holes are arranged on the foil substrate, and the two ends of the plurality of through holes respectively penetrate the alloy heating layer (3) and the soldering copper foil layer (4), one end of the plurality of blind holes respectively penetrates the alloy heating layer (3), and the other ends of the plurality of blind holes respectively extend to the front surface of the substrate (1), and a first connecting copper layer (50) is plated in each of the plurality of through holes, a second connecting copper layer (51) is plated on two opposite sides of the foil substrate, and a third connecting copper layer (52) is plated on the front surface of the alloy heating layer (3), and the plurality of the first connecting copper layers (50), the two second connecting copper layers (51), the third connecting copper layer (52), the alloy heating layer (3) and the soldering copper foil layer (4) are interconnected; In addition, pairs of bridge wires are made on the alloy heating layer (3), a welding pattern is made on the welding copper foil layer (4), and nickel-gold layers (6) are plated on the second connecting copper layer (51), the third connecting copper layer (52), the welding copper foil layer (4) and the plurality of blind holes.

2. The double bridge wire ignition resistor according to claim 1, characterized in that: The substrate (1) is made of high temperature resistant epoxy glass fiber cloth or a ceramic substrate, and the thickness of the substrate (1) is 200 to 600 μm; The alloy heating layer (3) has a thickness of 2 to 10 μm; the welding copper foil layer (4) has a thickness of 5 to 50 μm.

3. The double bridge wire ignition resistor according to claim 1, characterized in that: One end of each of the plurality of blind holes is exposed outside the third connecting copper layer (52); The thickness of the nickel-gold layer (6) located on the second connecting copper layer (51), the third connecting copper layer (52) and the welding copper foil layer (4) is consistent, and is 1 to 30 μm.

4. A process for manufacturing a double bridge wire ignition resistor as claimed in any one of claims 1 to 3, characterized in that: Proceed as follows: Step 1), preparing a substrate (1), and coating a colloid layer (2) on the front and back sides of the substrate (1); Step 2), stacking an alloy heating layer (3) on the colloid layer (2) on the front side, and stacking a soldering copper foil layer (4) on the other colloid layer (2) on the back side, and performing high-temperature pressing after stacking and layout to obtain a foil-coated substrate; Step 3), firstly, a plurality of through holes and a plurality of blind holes are processed on the foil substrate according to the design requirements, wherein the two ends of the plurality of through holes respectively pass through the alloy heating layer (3) and the welding copper foil layer (4), and the two ends of the plurality of blind holes respectively pass through the alloy heating layer (3) and the colloid layer (2) located on the front side, that is, the plurality of blind holes all use the front side of the substrate (1) as the bottom side; then, the two opposite sides of the foil substrate are cut to obtain two trimmed sides; Subsequently, a metallization treatment is performed on the plurality of through holes, the two trimmed sides, and the front surface of the alloy heating layer (3), so that the first connecting copper layer (50) is plated in the plurality of through holes, the second connecting copper layer (51) is plated on the two trimmed sides, and the third connecting copper layer (52) is plated on the front surface of the alloy heating layer (3), and the plurality of the first connecting copper layers (50), the two second connecting copper layers (51), the third connecting copper layer (52), the alloy heating layer (3) and the welding copper foil layer (4) are interconnected; in addition, during the above-mentioned metallization treatment process, it is ensured that one end of the plurality of blind holes is exposed outside the third connecting copper layer (52); Step 4), a bridge wire pattern is produced on the alloy heating layer (3), wherein the bridge wire pattern has a plurality of pairs of bridge wires; and a welding pattern is produced on the welding copper foil layer (4), to obtain a semi-finished ignition resistor; Step 5), cutting the semi-finished ignition resistor into a plurality of sheets, each of which has a pair of bridge wires; and then plating the second connecting copper layer (51), the third connecting copper layer (52), the welding copper foil layer (4) and the plurality of blind holes of each sheet with a nickel-gold layer (6), thereby obtaining a finished double-bridge wire ignition resistor.

5. The manufacturing process of the double bridge wire ignition resistor according to claim 4, characterized in that: The substrate (1) is made of high temperature resistant epoxy glass fiber cloth or a ceramic substrate, and the thickness of the substrate (1) is 200 to 600 μm; The alloy heating layer (3) has a thickness of 2 to 10 μm; the welding copper foil layer (4) has a thickness of 5 to 50 μm.

6. The manufacturing process of the double bridge wire ignition resistor according to claim 4, characterized in that: The process parameters for the high temperature pressing treatment in step 2) are: pressing temperature 300-400°C, pressing force 20-50Kg / cm 2 , pressing time 5 to 10 hours.

7. The manufacturing process of the double bridge wire ignition resistor according to claim 4, characterized in that: The size of the tablets is: length 1.2-2.4 mm, width 0.6-1.4 mm; The thickness of the nickel-gold layer (6) located on the second connecting copper layer (51), the third connecting copper layer (52) and the welding copper foil layer (4) is consistent, and is 1 to 30 μm.

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