ACCELERATION SENSOR
First Claim
1. An acceleration sensor, comprising:
- an oscillator unit for outputting an oscillator signal, the oscillator unit including;
a first piezoelectric vibrating reed having a vibrating arm that performs bending vibration; and
an oscillator circuit for oscillating the first piezoelectric vibrating reed;
a phase shifting unit for shifting and outputting a given phase angle of an output signal of the oscillator unit;
a phase shift circuit unit provided with a second piezoelectric vibrating reed having a vibrating arm that performs bending vibration, arranged at an output side of the phase shifting unit;
a multiplier for multiplying the output signal of the phase shift circuit unit by the output signal of the oscillator circuit; and
a phase shift modification output unit which receives an output from the multiplier and outputs a value corresponding to a change in a phase shift angle of an input-output signal of the phase shift circuit unit;
a resonant frequency of the second piezoelectric vibrating reed being equal to a frequency of the output signal of the oscillator unit, in a state where no acceleration is applied.
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Accused Products
Abstract
An acceleration sensor, including: an oscillator unit for outputting an oscillator signal, the oscillator unit including a first piezoelectric vibrating reed having a vibrating arm that performs bending vibration, as well as an oscillator circuit for oscillating the first piezoelectric vibrating reed; a phase shifting unit for shifting and outputting a given phase angle of an output signal of the oscillator unit; a phase shift circuit unit provided with a second piezoelectric vibrating reed having a vibrating arm that performs bending vibration, arranged at an output side of the phase shifting unit; a multiplier for multiplying the output signal of the phase shift circuit unit by the output signal of the oscillator circuit; and a phase shift modification output unit which receives an output from the multiplier and outputs a value corresponding to a change in a phase shift angle of an input-output signal of the phase shift circuit unit; a resonant frequency of the second piezoelectric vibrating reed being equal to a frequency of the output signal of the oscillator unit, in a state where no acceleration is applied.
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Citations
8 Claims
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1. An acceleration sensor, comprising:
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an oscillator unit for outputting an oscillator signal, the oscillator unit including;
a first piezoelectric vibrating reed having a vibrating arm that performs bending vibration; and
an oscillator circuit for oscillating the first piezoelectric vibrating reed;
a phase shifting unit for shifting and outputting a given phase angle of an output signal of the oscillator unit;
a phase shift circuit unit provided with a second piezoelectric vibrating reed having a vibrating arm that performs bending vibration, arranged at an output side of the phase shifting unit;
a multiplier for multiplying the output signal of the phase shift circuit unit by the output signal of the oscillator circuit; and
a phase shift modification output unit which receives an output from the multiplier and outputs a value corresponding to a change in a phase shift angle of an input-output signal of the phase shift circuit unit;
a resonant frequency of the second piezoelectric vibrating reed being equal to a frequency of the output signal of the oscillator unit, in a state where no acceleration is applied. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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Specification