Micro machine differential capacitance accelerometer with symmetrical structure
A technology of accelerometer and differential capacitance, which is applied in the direction of measuring acceleration, speed/acceleration/shock measurement, generator/motor, etc. It can solve the problems of performance degradation of accelerometer temperature characteristics, low bonding efficiency, and poor practicability, etc., to achieve Eliminate thermal mismatch stress, improve dynamic characteristics, and better anti-overload performance
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Embodiment 1
[0039] As shown in Figure 1-9, a micromechanical differential capacitive accelerometer with a symmetrical structure (glass electrode cover scheme). Figure 1A It is a frontal side view of the micromechanical differential capacitive accelerometer (glass electrode cover plan) according to the present invention. The accelerometer 100 of the glass electrode cover plan has a glass upper electrode cover plate 100Ga and a glass bottom electrode cover plate 100Gb , A silicon structural component 100S, Figure 1B It is an isometric side view of the 100 accelerometer with the upper glass electrode cover opened.
[0040] figure 2 It is the substrate 1 used to process the silicon structural component 100S, which is the front side view of a dual device layer SOI monocrystalline silicon wafer as described above, such as figure 2 As shown, this SOI wafer has a single crystal silicon lining 4, and the front and back sides of the single crystal silicon lining 4 have silicon dioxide insulating laye...
Embodiment 2
[0050] As shown in Figure 10-12, a micro-machined differential capacitance accelerometer with a symmetrical structure (single crystal silicon electrode cover plan). The monocrystalline silicon cover plan in this embodiment uses the same monocrystalline silicon structure component 100S as the glass electrode cover plan described in Example 1, except that monocrystalline silicon is selected as the electrode cover material, and the same structure is used The electrode cover plate made of glass material is different. Figure 10A Shown is a frontal side view of the monocrystalline silicon upper electrode cover 200Ga of the micromechanical differential capacitive accelerometer (single crystal silicon electrode cover scheme) 200 according to the present invention, Figure 10B It is an isometric side view of the back of the single crystal silicon upper electrode cover plate 200Ga. Since the single crystal silicon lower cover plate 200Gb and the single crystal silicon upper plate 200Ga ha...
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