Inertia sensor and inertia detector device
First Claim
1. A detector device, comprising:
- a fixed block with a fixed capacitance element with a fixed capacitance value;
a plurality of variable blocks positioned about the fixed bock, each variable block having a variable capacitance element with a capacitance value that changes in accordance with applied inertial force, the variable blocks reciprocally displacing relative to the fixed block in respective predetermined directions to detect a value of the applied inertial force based on the capacitance value of the respective variable capacitance element, one side of the fixed capacitance element and one side of each of the variable capacitance elements electrically coupled together;
a drive circuit for outputting a drive pulse signal for displacing the variable blocks;
a detection pulse signal applying unit by which applies detection pulse signals to the other sides of the variable capacitance elements and the fixed capacitance element which are not coupled together, the detection pulse signals having a plurality of phases, each phase having a predetermined phase difference at a timing synchronized with the drive pulse signals; and
an inertia detection unit which detects a difference in capacitance (a) between the variable capacitance elements to which the detection pulse signals having the phase differences are applied, or (b) between the fixed capacitance element and the variable capacitance elements, and detecting the applied inertial force based on the difference in capacitance value,wherein,each variable block includes a movable body suspended therein by means of flexible support beams allowing displacement of the movable body upon application of the applied inertial force.
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Abstract
A detector device includes a drive circuit for outputting a drive pulse signal for displacing the variable block, a detection pulse signal applying unit by which the variable capacitance elements and the fixed capacitance element whose one end is connected in common are respectively applied, at their other ends, with detection pulse signals with a plurality of phases each having a predetermined phase difference at a timing synchronized with the drive pulse signal, and an inertia detection unit for detecting a difference in capacitance value between the variable capacitance elements to which the detection pulse signal having the phase difference is applied, or between the fixed capacitance element and the variable capacitance element, and detecting the applied inertial force based on the difference.
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Citations
10 Claims
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1. A detector device, comprising:
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a fixed block with a fixed capacitance element with a fixed capacitance value; a plurality of variable blocks positioned about the fixed bock, each variable block having a variable capacitance element with a capacitance value that changes in accordance with applied inertial force, the variable blocks reciprocally displacing relative to the fixed block in respective predetermined directions to detect a value of the applied inertial force based on the capacitance value of the respective variable capacitance element, one side of the fixed capacitance element and one side of each of the variable capacitance elements electrically coupled together; a drive circuit for outputting a drive pulse signal for displacing the variable blocks; a detection pulse signal applying unit by which applies detection pulse signals to the other sides of the variable capacitance elements and the fixed capacitance element which are not coupled together, the detection pulse signals having a plurality of phases, each phase having a predetermined phase difference at a timing synchronized with the drive pulse signals; and an inertia detection unit which detects a difference in capacitance (a) between the variable capacitance elements to which the detection pulse signals having the phase differences are applied, or (b) between the fixed capacitance element and the variable capacitance elements, and detecting the applied inertial force based on the difference in capacitance value, wherein, each variable block includes a movable body suspended therein by means of flexible support beams allowing displacement of the movable body upon application of the applied inertial force. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. An inertia sensor, comprising:
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a structural body with (a) a plurality of variable blocks, each with a variable capacitance element whose capacitance value changes in accordance with applied inertial force and (b) a fixed block with a fixed capacitance element whose capacitance value is fixed, one side of the fixed capacitance element and one side of each of the variable capacitance elements being electrically coupled together, each variable block reciprocally displacing relative to the fixed block in a predetermined direction, each variable block including a movable body suspended therein by support beams allowing the movable body to vibrate; and a detector device for detecting a value of the applied inertial force based on the capacitance value of the capacitance elements of the structural body, wherein, the detector device includes (a) a drive circuit which outputs a drive pulse signal which displaces the variable block (b) a detection pulse signal applying unit which applies respective detection pulse signals with a plurality of phases each having a predetermined phase difference at a timing synchronized with the drive pulse signal and (c) an inertia detection unit which detects a difference in capacitance value between the variable capacitance elements to which the detection pulse signals having the phase difference are applied, or between the fixed capacitance element and the variable capacitance elements, and detecting the applied inertial force based on the difference.
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Specification