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Anti-interference self-recovery SMD package metal droplet acceleration switch

An acceleration switch and metal droplet technology, which is applied in the direction of electric switches, electrical components, circuits, etc., can solve problems such as breaking into multiple droplets, device failure, and acceleration switch threshold changes

Active Publication Date: 2021-05-18
ZHONGBEI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, during the process of mercury passing through the microchannel, if there is interference, the mercury may break into multiple droplets. Due to the mass change caused by the breakage of mercury, the threshold value of the acceleration switch will change, resulting in device failure.

Method used

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  • Anti-interference self-recovery SMD package metal droplet acceleration switch
  • Anti-interference self-recovery SMD package metal droplet acceleration switch
  • Anti-interference self-recovery SMD package metal droplet acceleration switch

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] refer to figure 1 , including a transparent insulating top cover 1, a metal droplet 2 and a conductive substrate 3, the metal droplet 2 is located in a closed space after the transparent insulating top cover 1 and the conductive substrate 3 are interlocked and combined;

[0041] refer to figure 2 and image 3 , the transparent insulating top cover 1 includes a cover body 101, the inside of the cover body 101 is a hollow chamber for accommodating metal droplets 2, and the material of the transparent insulating top cover 1 is glass or transparent epoxy resin , the position and shape of the metal droplet can be observed through the insulating top cover 1. In the research and development stage, the high-speed camera can be used to dynamically detect, analyze and evaluate the switch, and the acceleration threshold of the switch can be determined more accurately. In the use stage, it can be Perform visual inspection and failure analysis of the switch.

[0042] The section...

Embodiment 2

[0054] Embodiment 2 is different from the foregoing embodiments in that,

[0055] refer to Figure 5 , the shape of the second internal electrode 303 can be reduced to the minimum (that is, as long as the second internal electrode 303 is contained in the hollow chamber inside the cover 101), by increasing the area ratio of the first electrode and the second electrode, the Normally open switch threshold, improve overload direction detection sensitivity, enhance anti-interference ability, normally closed switch can also adopt similar methods.

[0056] The method for adjusting the metal droplet acceleration switch threshold of the present invention includes: changing the area ratio of the first inner electrode 302 and the second inner electrode 303; changing the volume ratio of the metal droplet 2 and the chamber; changing the protrusion chamber 102 and The volume ratio of the wedge chamber 103 is convenient for batch design and production.

Embodiment 3

[0057] Embodiment 3 is different from the foregoing embodiments in that,

[0058] refer to Figure 6 and Figure 7 , the length of the conductive substrate 3 can be extended, longer than the transparent insulating top cover 1, the first pin 4 is changed to the first pad 306, and the second pin 5 is changed to the second pad 307, so that it can be used Figure 7 package form, in Figure 7 Among them, the metal droplet acceleration switch is connected to the peripheral circuit through the first pad 306 and the second pad 307, and is suitable to be packaged as a hybrid integrated circuit together with the peripheral circuit.

[0059] In order to meet the working environment temperature requirements of the ammunition fuze -45°C ~ 55°C, the conductive metal droplet of the switch is mercury or liquid amalgam containing 8.5% thallium, the freezing point of the thallium amalgam is -60°C, and the original diameter of the droplet is 1.5mm . The installation area of ​​the switch is 4...

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Abstract

The invention discloses an anti-jamming self-restoring patch-packaged metal droplet acceleration switch, which relates to the field of acceleration switches and includes a transparent insulating top cover, a metal droplet and a conductive substrate, and the metal droplet is located between the transparent insulating top cover and the In the closed space after the conductive substrates are interlocked and combined. In the present invention, by adjusting the area ratio of the first internal electrode and the second internal electrode, it can be set as a normally open or normally closed type, which is a one-way sensitive trigger and reusable acceleration switch. Sensitive to overload and constant acceleration overload, strong anti-interference ability, compatible with SMA package, small size, easy to integrate, and can resist recoil impact overload when medium and large caliber grenades are launched. When a one-way steady-state acceleration overload signal exceeding the threshold appears, the switch state changes (normally closed conduction, normally open close) and can be maintained stably. When the acceleration signal disappears, the switch can self-recover and maintain the initial state.

Description

technical field [0001] The invention relates to the field of acceleration switches, in particular to technologies related to acceleration overload identification and control in ammunition fuze, aerospace, and automobile safety technologies. Background technique [0002] Inertial acceleration overload measurement and control is one of the key technologies in ammunition fuze, automotive electronics, aerospace and other fields. Commonly used inertial components include acceleration sensors, acceleration switches, etc., among which acceleration switches (also known as g switches, inertia switches, etc.) are passive devices that integrate sensing and execution, and are used to sense acceleration signals. When the acceleration signal appears, the internal inertial conductor moves and collides with the fixed electrode to perform the switching action. Compared with the acceleration sensor, the acceleration switch has the advantages of fast response, simple signal processing, and lo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01H35/14
CPCH01H35/14H01H35/145
Inventor 李波安晓红张亚李世中
Owner ZHONGBEI UNIV
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