A kind of miniature surface mount type ignition resistor and its preparation method
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An ignition resistor, surface mount technology, applied in the field of miniature surface mount ignition resistor and its preparation, can solve the problems of high ignition current, large package size, poor safety and the like
Active Publication Date: 2021-04-20
BEIJING MECHANICAL EQUIP INST
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[0007] In view of the above analysis, the embodiment of the present invention aims to provide a miniature surface mount ignition resistor and its preparation method to solve the existing problems of excessive package size, high ignition current and poor safety
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Embodiment 1
[0051] Such as figure 1 As shown, a specific embodiment of the present invention discloses a miniature surface-mounted ignition resistor, which includes a substrate 1, a resistive layer 2, a protective layer 3, a welding pad 4, and a surface-mounted ignition resistor. Connection layer 5, copper layer 6, nickel layer 7, tin layer 8.
[0052] The upper surface of the substrate 1 is provided with a resistance layer 2, and the two ends of the lower surface are respectively provided with pads 4; the two ends of the resistance layer 2 are electrically connected to the corresponding pads 4 through the surface and back lapping layers 5 respectively; the middle part of the upper surface of the resistance layer 2 is A protective layer 3 is also provided, and the two sides of the protective layer 3 are closely connected with the corresponding sides of the front and back lapping layers 5; Preferably, the thickness of the copper layer 6 is 0.01-0.03 mm, the thickness of the nickel layer 7...
Embodiment 2
[0067] Such as image 3 As shown, a preparation method for preparing the miniature surface mount type ignition resistor described in Example 1 comprises the steps:
[0068] S1. Cleaning the substrate 1 to remove oil stains and impurities on its surface.
[0069] S2. Prepare pads 4 at both ends of the lower surface of the substrate 1 . Specifically, pads 4 are respectively prepared on both ends of the lower surface of the substrate 1 by at least one of a screen printing process and a sputtering coating process.
[0070] S3. On the upper surface of the substrate 1, a resistive layer 2 is prepared.
[0071] S4. In the middle of the upper surface of the resistance layer 2, a protective layer 3 is prepared. Specifically, the protection layer 3 is formed on the resistance layer 2 through a sputtering coating process.
[0072] S5. On both ends of the resistance layer 2, surface and back overlapping layers 5 are respectively prepared, and one end of each surface and back overlappi...
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Abstract
The invention relates to a miniature surface-mounted ignition resistor and a preparation method thereof, belonging to the technical field of electrical explosives, and solves the problems of excessive package size, relatively high ignition current and poor safety in the prior art. The miniature surface-mounted ignition resistor disclosed by the present invention comprises a substrate 1 , a resistance layer 2 , a protective layer 3 , a welding pad 4 , an overlapping layer 5 on the front and back, a copper layer 6 , a nickel layer 7 , and a tin layer 8 . The upper surface of the substrate 1 is provided with a resistance layer 2 , and the two ends of the lower surface are respectively provided with pads 4 . The two ends of the resistance layer 2 are respectively connected to the corresponding pads 4 through the surface and back bonding layers 5 ; the middle part of the upper surface of the resistance layer 2 is also provided with a protective layer 3 . A copper layer 6 , a nickel layer 7 and a tin layer 8 are sequentially provided on the outer surface of the front and back lapping layer 5 . The package size of the ignition resistor is small, the ignition current is about 0.1A, the ignition time is less than 100μs, and the ignition energy is about 1mJ. It can realize rapid ignition under micro-excitation, and has good safety performance, which has outstanding technical advantages.
Description
technical field [0001] The invention relates to the technical field of electrical explosive devices, in particular to a miniature surface-mounted ignition resistor and a preparation method thereof. Background technique [0002] Existing miniature ignition resistors generally adopt a straight bridge structure, such as the metal thin film ignition resistors given in patents CN102927590A and CN105674808B. This straight bridge structure has the following disadvantages: [0003] 1) Although the ignition voltage is low (usually the ignition voltage is 4-5V), the required ignition current is very large (for example, 1.5A in CN105674808B), so the safety is poor; [0004] 2) The base material is generally made of Al 2 o 3 Ceramics, aluminum nitride, etc., Al 2 o 3 The thermal conductivity of ceramics is 24.7W / (m K), and the thermal conductivity of aluminum nitride is 270W / (m K). Because the thermal conductivity of the two is too high, it does not meet the heat insulation require...
Claims
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