Drive detection device for gyroscope
First Claim
1. A drive detection device for a gyroscope including at least one vibrator which has a pair of drive electrodes extending in a longitudinal direction on one surface and a pair of detection electrodes extending in the longitudinal direction on an opposing surface and which is dielectric-polarized in one direction between one surface and the opposing surface, comprising:
- a drive system to give drive signals opposite from each other in phase to the pair of drive electrodes; and
a detection system including a pair of I/V conversion mechanisms to respectively convert current outputs detected from the pair of detection electrodes into voltage outputs and an addition mechanism to add voltage outputs of the I/V conversion mechanisms.
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Accused Products
Abstract
A pair of electrodes are formed on the front surface and the rear surface of each vibrator in a longitudinal direction, and dielectric polarization is performed in the direction from the front surface to the rear surface. When I/V converters constituted by operational amplifiers are connected to electrodes of the middle vibrator, the detection electrodes can be grounded to a reference potential Vref through the imaginary short circuits of the I/V converters, so that a gyroscope can be vibrated without a conventional ground electrode. Therefore, the number of electrodes of the vibrators can be reduced, and an interval size between the drive electrodes or between the detection electrodes can be assured. For this reason, sufficient dielectric polarization can be performed when a high voltage is applied.
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Citations
7 Claims
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1. A drive detection device for a gyroscope including at least one vibrator which has a pair of drive electrodes extending in a longitudinal direction on one surface and a pair of detection electrodes extending in the longitudinal direction on an opposing surface and which is dielectric-polarized in one direction between one surface and the opposing surface, comprising:
- a drive system to give drive signals opposite from each other in phase to the pair of drive electrodes; and
a detection system including a pair of I/V conversion mechanisms to respectively convert current outputs detected from the pair of detection electrodes into voltage outputs and an addition mechanism to add voltage outputs of the I/V conversion mechanisms. - View Dependent Claims (2, 3)
- a drive system to give drive signals opposite from each other in phase to the pair of drive electrodes; and
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4. A drive detection device for a gyroscope including at least one vibrator which has first and second drive electrodes extending in a longitudinal direction on one surface and first and second detection electrodes extending in the longitudinal direction on an opposing surface and which is dielectric-polarized between the surface and the opposing surface, comprising:
- a circuit of a drive system to generate drive signals being in-phase to the first and second drive electrodes; and
a detection system having a pair of I/V conversion mechanisms to respectively convert current outputs detected from the first and second detection electrodes into voltage outputs and a differential amplification mechanism to subtract voltage outputs of the I/V conversion mechanisms from each other. - View Dependent Claims (5, 6, 7)
- a circuit of a drive system to generate drive signals being in-phase to the first and second drive electrodes; and
Specification