Cup-type bridge wire ignition resistor and its manufacturing process

Abstract

This invention discloses a cup-type bridge wire ignition resistor and its manufacturing process. The cup-type bridge wire ignition resistor includes a bridge wire substrate, a cover plate pressed and fixed onto the bridge wire substrate, and pads disposed on the outer periphery of both ends of the cover plate and the bridge wire substrate. A bridge wire is welded and fixed to the inner side of the bridge wire substrate. The cover plate has a cup hole corresponding to the bridge wire position to avoid the bridge wire. The bridge wire is electrically connected to the pads. This invention forms a cup-type bridge wire ignition resistor by setting a cup structure, which is more than 80% smaller in volume than other traditional types of bridge wires. Furthermore, the bridge wire is placed inside the cup, preventing easy damage. This invention uses a cup to fill the ignition agent, and the agent is enclosed inside the cup, making the ignition head less prone to breakage, thus improving shock resistance, safety, and reliability.

Description

Technical Field

[0001] This invention relates to the field of electronic detonator ignition head technology, specifically to a cup-type bridge wire ignition resistor and its manufacturing process. Background Technology

[0002] Traditional electric detonator ignition head bridge wire resistors have two welding methods: one is to weld the bridge wire directly to the detonator lead wire to form the bridge wire resistor; the other is to first weld the bridge wire to a metal connector, and then weld the metal connector to the detonator lead wire. Because the bridge wire formed by these two welding methods lacks a dedicated protective structure, it is easily damaged, especially under vibration, thus affecting the electric detonator's shock resistance, safety, and reliability. Summary of the Invention

[0003] To overcome the above-mentioned defects, the present invention provides a cup-type bridge wire ignition resistor and its manufacturing process, which sets up a cup and places the bridge wire inside it, thereby avoiding easy damage to the bridge wire and improving the shock resistance, safety and reliability of the electric detonator.

[0004] The technical solution adopted by the present invention to solve its technical problem is: a cup-type bridge wire ignition resistor, including a bridge wire substrate, a cover plate pressed and fixed on the bridge wire substrate, and pads disposed on the outer periphery of both ends of the cover plate and the bridge wire substrate; wherein, a bridge wire is welded and fixed on the inner side of the bridge wire substrate, the cover plate is provided with a cup hole for avoiding the bridge wire at the position of the bridge wire, and the bridge wire is electrically connected to the pads.

[0005] As a further improvement of the present invention, the bridge wire substrate is formed by welding bridge wires to one side of a double-sided copper-clad substrate.

[0006] As a further improvement of the present invention, the bridge wire is curved in an arc shape toward the medicine cup hole.

[0007] As a further improvement of the present invention, the bridge wire substrate is formed by laminating two layers of double-sided copper-clad substrates, and the bridge wire is welded and fixed on one of the double-sided copper-clad substrates near the cover plate, and the double-sided copper-clad substrate forms a through hole corresponding to the position of the bridge wire.

[0008] As a further improvement of the present invention, the bridge wire is curved in an arc shape toward the medicine cup hole.

[0009] As a further improvement of the present invention, the bridge wire is curved in an arc shape in the direction away from the medicine cup hole.

[0010] This invention also provides a manufacturing process for a cup-type bridge wire ignition resistor, comprising the following steps:

[0011] S1, a non-conductive material is selected as the substrate, and a copper foil is attached to each of the two opposite sides of the substrate to form a copper-clad substrate;

[0012] S2, Drill a first positioning hole at the periphery of the copper-clad substrate;

[0013] S3, several pairs of bridge wire welding surface patterns are etched on one side of the copper-clad substrate, and a nickel-gold layer or a nickel-palladium-gold layer is plated at the positions of the two corresponding bridge wire welding points of each pair of bridge wire welding surface patterns.

[0014] S4, cut several bridge wires of the required size, and weld the two ends of each bridge wire to the two bridge wire welding points of each pair of bridge wire welding surface patterns;

[0015] S5, apply solder paste to the solder joints of the soldered bridge wires using a dispensing machine, and melt the solder paste in a reflow oven to coat the solder joints of the bridge wires, thus forming a bridge wire substrate containing several bridge wire units.

[0016] S6. Take another copper-clad substrate obtained in step S1, and drill a second positioning hole at the periphery of the copper-clad substrate corresponding to the first positioning hole. At the same time, drill several cup holes on one side corresponding to several pairs of bridge wire welding surface patterns, and etch away the excess copper foil to form a cover plate containing several cover plate units.

[0017] S7, apply glue to the bottom of the cover plate, use the first positioning hole and the second positioning hole to accurately fit the cover plate onto the bridge wire substrate, and then press and fix the cover plate and the bridge wire substrate into one piece, and each bridge wire unit and cover plate unit correspondingly form a first medicine cup type bridge wire ignition resistor unit.

[0018] S8, slots are cut at both ends corresponding to each of the first cup-type bridge wire ignition resistor units, and copper is plated in the slots to form solder pads, thereby obtaining a semi-finished product containing a number of cup-type bridge wire ignition resistor units.

[0019] S9, cut each unit of the semi-finished product into a single piece;

[0020] S10, after inspection and packaging, is made into several individual medicine cup-type bridge wire ignition resistors.

[0021] As a further improvement of the present invention, in step S1, the non-conductive material is ceramic or glass fiber cloth.

[0022] As a further improvement of the present invention, in step S2, the copper-clad substrate is a square plate, and the first positioning holes are set at its four corners.

[0023] As a further improvement of the present invention, in step S9, the semi-finished product is cut into individual chips using a chip cutting device.

[0024] The beneficial effects of this invention are as follows: This invention forms a cup-type bridge wire ignition resistor by setting a cup structure, which is more than 80% smaller in volume than other traditional types of bridge wires; and the bridge wire is placed inside the cup, preventing easy damage; this invention uses a chip-level wire bonding machine, achieving high wire bonding precision, and the bridge wire length can be controlled within a 0.3% error, more than 10 times higher than traditional bridge wire precision; this invention uses a cup to fill the ignition agent, with the agent encased inside the cup, making the ignition head less prone to breakage, thus improving shock resistance, safety, and reliability; this invention uses circuit photolithography technology, enabling industrial production with high consistency, unlike traditional bridge wire manufacturing where equipment wear causes inconsistent product quality. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the structure of Embodiment 1 of the present invention;

[0026] Figure 2 This is a schematic diagram of the structure of Embodiment 2 of the present invention;

[0027] Figure 3 This is a schematic diagram of the structure of Embodiment 3 of the present invention;

[0028] Figure 4 This is a schematic diagram of the structure of Embodiment 4 of the present invention;

[0029] Figure 5 This is a top view of Embodiment 1 of the present invention;

[0030] Figure 6 This is a bottom view of Embodiment 1 of the present invention.

[0031] Referring to the accompanying drawings, the following explanations are provided:

[0032] 1. Bridge wire substrate; 11. Bridge wire; 12. Through hole; 2. Cover plate; 21. Fluid cup hole; 3. Solder pad. Detailed Implementation

[0033] The following detailed description of several preferred embodiments of the present invention is provided in conjunction with the accompanying drawings.

[0034] Example 1:

[0035] See appendix Figure 1This is a schematic diagram of a bridge wire ignition resistor according to the present invention, including a bridge wire substrate 1, a cover plate 2 pressed and fixed onto the bridge wire substrate, and pads 3 disposed on the outer periphery of both ends of the cover plate and the bridge wire substrate. A bridge wire 11 is welded and fixed to the inner side of the bridge wire substrate. The cover plate has a cup hole 21 corresponding to the bridge wire position to avoid the bridge wire. The bridge wire is curved towards the cup hole 21, and the bridge wire 11 is electrically connected to the pads 3. In use, ignition agent can be filled into the cup hole, so that the agent is enclosed inside the cup, making the ignition head less prone to breakage, thus improving shock resistance, safety, and reliability.

[0036] In this embodiment, the shape of the medicine cup can be customized as needed, such as oval or round. (See reference...) Figure 5 This is a top view of the ignition resistor. Figure 6 This is a bottom view.

[0037] The manufacturing process of this cup-type bridge wire ignition resistor is as follows:

[0038] S1, a non-conductive material such as ceramic or glass fiber cloth is selected as the substrate, and a copper foil is attached to each of the two opposite sides of the substrate to form a copper-clad substrate, preferably a square plate.

[0039] S2, Drill the first positioning holes at the periphery of the copper-clad substrate, i.e., at the four corners;

[0040] S3, several pairs of bridge wire welding surface patterns (usually circular, i.e., the copper foil outside the welding point is etched out) are etched on one side of the copper-clad substrate, and nickel-gold or nickel-palladium-gold layers are plated at the positions of the two bridge wire welding points corresponding to each pair of bridge wire welding surface patterns.

[0041] S4, cut several bridge wires to the required size, and weld the two ends of each bridge wire to the two bridge wire welding points of each pair of bridge wire welding surface patterns respectively;

[0042] S5. Apply solder paste to the solder joints of the soldered bridge wires using a dispensing machine, and then melt the solder paste in a reflow oven to coat the solder joints of the bridge wires, thus creating a bridge wire substrate containing several bridge wire units. Alternatively, a dispensing machine can be used to apply adhesive to the solder joints of the bridge wires and then cure it to create a bridge wire substrate.

[0043] S6. Take another copper-clad substrate obtained in step S1, and drill a second positioning hole at the periphery of the copper-clad substrate corresponding to the first positioning hole position. At the same time, drill a number of cup holes (cup holes are through holes) at one side corresponding to the positions of several pairs of bridge wire welding surface patterns, and etch away the excess copper foil to form a cover plate containing several cover plate units.

[0044] S7, apply glue to the bottom of the cover plate, use the first positioning hole and the second positioning hole to accurately fit the cover plate onto the bridge wire substrate, and then press and fix the cover plate and the bridge wire substrate into one piece, and each bridge wire unit and the cover plate unit correspondingly form the first medicine cup type bridge wire ignition resistor unit.

[0045] S8. Grooves are cut at both ends of each first cup-type bridge wire ignition resistor unit, and copper is plated in the grooves to form solder pads, thus obtaining a semi-finished product containing several cup-type bridge wire ignition resistor units.

[0046] S9, using a chip cutting device to cut each unit of the semi-finished product into a single chip;

[0047] S10, after inspection and packaging, is a plurality of individual medicine cup-type bridge wire ignition resistors as described in this embodiment.

[0048] Example 2:

[0049] See appendix Figure 2 This is a schematic diagram of another structure of a cup-type bridge wire ignition resistor according to the present invention. The main structure is the same as that of Embodiment 1. The difference between this embodiment and Embodiment 1 is that the bridge wire substrate 1 of this embodiment is formed by laminating two layers of double-sided copper-clad substrates. The bridge wire is welded and fixed on a layer of double-sided copper-clad substrate near the cover plate 2, and the double-sided copper-clad substrate forms a through hole corresponding to the position of the bridge wire.

[0050] Similarly, when using this cup-type bridge wire ignition resistor, the ignition agent can be filled into the cup hole. In this way, the agent is wrapped inside the cup, making the ignition head less prone to damage, thus improving shock resistance, safety and reliability.

[0051] The manufacturing process of the cup-type bridge wire ignition resistor in this embodiment is basically the same as that in embodiment 1. The difference is that after step S2, another copper-clad substrate is made, and through holes are made on the copper-clad substrate. Then the bridge wire is soldered on the copper-clad substrate. In step S7, the two copper-clad substrates and the cover plate are pressed and fixed together to form the cup-type bridge wire ignition resistor of the present invention.

[0052] Example 3:

[0053] See appendix Figure 3 This is a schematic diagram of the third structure of a cup-type bridge wire ignition resistor according to the present invention. In this embodiment, the bridge wire substrate 1 is formed by laminating two layers of double-sided copper-clad substrates. The bridge wire 11 is welded and fixed on a layer of double-sided copper-clad substrate near the cover plate 2, and a through hole 12 is formed on this layer of double-sided copper-clad substrate corresponding to the position of the bridge wire 11. The difference between this embodiment and embodiment 2 is that the bridge wire in embodiment 2 is curved in an arc shape away from the direction of the cup hole 21.

[0054] Similarly, when using this cup-type bridge wire ignition resistor, the ignition agent can be filled into the cup hole. In this way, the agent is wrapped inside the cup, making the ignition head less prone to damage, thus improving shock resistance, safety and reliability.

[0055] The manufacturing process of the cup-type bridge wire ignition resistor in this embodiment is exactly the same as that in Embodiment 2, except for the orientation of the bridge wire.

[0056] Example 4:

[0057] See appendix Figure 4 This is a schematic diagram of the fourth structure of a cup-type bridge wire ignition resistor according to the present invention. The structure of this embodiment is basically the same as that of embodiment 3, except that the structure of the solder pads is different.

[0058] Similarly, when using this cup-type bridge wire ignition resistor, the ignition agent can be filled into the cup hole. In this way, the agent is wrapped inside the cup, making the ignition head less prone to damage, thus improving shock resistance, safety and reliability.

[0059] The manufacturing process of the cup-type bridge wire ignition resistor in this embodiment is exactly the same as that in Embodiment 3, except for the shape of the solder pads.

[0060] Therefore, this invention, by setting a cup structure to form a cup-type bridge wire ignition resistor, is more than 80% smaller in volume than other traditional types of bridge wires; and the bridge wire is placed inside the cup, so it will not be easily damaged; this invention uses a chip-level wire bonding machine, which has high wire bonding precision, and the bridge wire length can be controlled within three-thousandths of an error, which is more than 10 times more precise than traditional bridge wires; this invention uses a cup to fill the ignition agent, and the agent is wrapped inside the cup, so the ignition head is not easily damaged, which improves shock resistance, safety and reliability; this invention uses circuit photolithography process, which can be industrialized and has high consistency, unlike traditional bridge wire manufacturing where equipment wear and tear causes inconsistent quality between products.

[0061] Many specific details have been set forth in the foregoing description to provide a thorough understanding of the present invention. However, the above description is merely a preferred embodiment of the present invention, and the present invention can be implemented in many other ways different from those described herein. Therefore, the present invention is not limited to the specific embodiments disclosed above. Furthermore, any person skilled in the art can make many possible variations and modifications to the technical solutions of the present invention, or modify them into equivalent embodiments, using the methods and techniques disclosed above, without departing from the scope of the present invention. Any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present invention, without departing from the content of the present invention, shall still fall within the protection scope of the present invention.

Claims

1. A manufacturing process for a cup-type bridge wire ignition resistor, characterized in that: The cup-type bridge wire ignition resistor includes a bridge wire substrate, a cover plate pressed and fixed on the bridge wire substrate, and pads disposed on the outer periphery of both ends of the cover plate and the bridge wire substrate; wherein, a bridge wire is welded and fixed on the inner side of the bridge wire substrate, the cover plate is provided with a cup hole for avoiding the bridge wire corresponding to the position of the bridge wire, and the bridge wire is electrically connected to the pads. The manufacturing process of the aforementioned cup-type bridge wire ignition resistor includes the following steps: S1, a non-conductive material is selected as the substrate, and a copper foil is attached to each of the two opposite sides of the substrate to form a copper-clad substrate; S2, Drill a first positioning hole at the periphery of the copper-clad substrate; S3, several pairs of bridge wire welding surface patterns are etched on one side of the copper-clad substrate, and a nickel-gold layer or a nickel-palladium-gold layer is plated at the positions of the two corresponding bridge wire welding points of each pair of bridge wire welding surface patterns. S4, cut several bridge wires of the required size, and weld the two ends of each bridge wire to the two bridge wire welding points of each pair of bridge wire welding surface patterns; S5, apply solder paste to the solder joints of the soldered bridge wires using a dispensing machine, and melt the solder paste in a reflow oven to coat the solder joints of the bridge wires, thus forming a bridge wire substrate containing several bridge wire units. S6. Take another copper-clad substrate obtained in step S1, and drill a second positioning hole at the periphery of the copper-clad substrate corresponding to the first positioning hole. At the same time, drill several cup holes on one side corresponding to several pairs of bridge wire welding surface patterns, and etch away the excess copper foil to form a cover plate containing several cover plate units. S7, apply glue to the bottom of the cover plate, use the first positioning hole and the second positioning hole to accurately fit the cover plate onto the bridge wire substrate, and then press and fix the cover plate and the bridge wire substrate into one piece, and each bridge wire unit and cover plate unit correspondingly form a first medicine cup type bridge wire ignition resistor unit. S8, slots are cut at both ends corresponding to each of the first cup-type bridge wire ignition resistor units, and copper is plated in the slots to form solder pads, thereby obtaining a semi-finished product containing a number of cup-type bridge wire ignition resistor units. S9, cut each unit of the semi-finished product into a single piece; S10, after inspection and packaging, is made into several individual medicine cup-type bridge wire ignition resistors.

2. The manufacturing process of the cup-type bridge wire ignition resistor according to claim 1, characterized in that: The bridge wire substrate is formed by welding bridge wires onto one side of a double-sided copper-clad substrate.

3. The manufacturing process of the cup-type bridge wire ignition resistor according to claim 2, characterized in that: The bridge wire is curved in an arc towards the medicine cup hole.

4. The manufacturing process of the cup-type bridge wire ignition resistor according to claim 1, characterized in that: The bridge wire substrate is formed by laminating two layers of double-sided copper-clad substrates. The bridge wire is welded and fixed on one of the double-sided copper-clad substrates near the cover plate, and the double-sided copper-clad substrate forms a through hole corresponding to the position of the bridge wire.

5. The manufacturing process of the cup-type bridge wire ignition resistor according to claim 4, characterized in that: The bridge wire is curved in an arc towards the medicine cup hole.

6. The manufacturing process of the cup-type bridge wire ignition resistor according to claim 4, characterized in that: The bridge wire is curved in an arc shape in the direction away from the medicine cup hole.

7. The manufacturing process of the cup-type bridge wire ignition resistor according to claim 1, characterized in that: In step S1, the non-conductive material is ceramic or glass fiber cloth.

8. The manufacturing process of the cup-type bridge wire ignition resistor according to claim 1, characterized in that: In step S2, the copper-clad substrate is a square plate, and the first positioning holes are located at its four corners.

9. The manufacturing process of the cup-type bridge wire ignition resistor according to claim 1, characterized in that: In step S9, the semi-finished product is cut into individual chips using a chip cutting device.

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