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US 2006/0219536 A1Published application
Acceleration sensitive switch
AssigneeAgency for Science, Technology and Research
InventorsFrancis Tay Eng Hock, Ki Lee
Life of this patent
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Abstract
An acceleration sensitive switch arrangement (208) includes an acceleration sensitive variable capacitor(200), a detection circuit(202) for detecting a capacitance value of the variable capacitor(200), and a switching circuit (204) responsive to a comparison between the detected capacitance and a threshold value.
Claims20
An switching arrangement sensitive to acceleration, the switching arrangement comprising:
- an acceleration sensitive variable capacitor;
- a detection circuit for detecting a capacitance value of the variable capacitor;
- and
- a switching circuit responsive to a comparison between the detected capacitance and a threshold value.
1 more element
An acceleration sensitive variable capacitor comprising:
- a base with at least one first electrode thereon;
- a mass forming a second electrode resiliently suspended by at least one spring a first predetermined distance from the base, the spring applying a spring force to the mass in a direction away from the base;
- and
- the first electrode being adapted to provide an electrostatic attractive force to the mass, the attractive force being inversely proportional to the distance between the first electrode and the mass,
- wherein the attractive force overcomes the spring force and draws the mass towards the base upon the mass being moved, due to acceleration, to within a second predetermined distance from the base.
2 more elements
Dependencies are inferred from the claim text.