Angular Velocity Sensor Temperature Compensation via Phase Shift
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Solution Overview
Problem
Existing angular velocity sensors in digital cameras face challenges in maintaining detection sensitivity over a wide temperature range due to temperature-sensitive elements, which require additional space and decrease productivity in compact designs.
Innovation Solution
The angular velocity sensor employs a method to control detuning frequency sensitivity changes by adjusting the detection phase, eliminating the need for temperature-sensitive elements and maintaining constant sensitivity across a wide temperature range.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a temperature-sensitive element (such as a thermistor) is used in the phase-shift circuit to correct circuit constants for temperature compensation, then the detection sensitivity stability over temperature is improved, but the device area increases and productivity decreases due to the need for additional space and surface mounting processes
Solution Approach 1:
The patent extracts and eliminates the temperature-sensitive element (thermistor) from the phase-shift circuit. Instead of using a separate temperature compensation component, the invention integrates temperature compensation functionality directly into the oscillation circuit design by utilizing the inherent temperature characteristics of the piezoelectric vibrator's resonant frequency to automatically compensate for circuit constant variations, thereby removing the need for additional components and surface mounting processes
Solution Approach 2:
The patent merges the temperature compensation function with the oscillation circuit itself. By designing the oscillation circuit to utilize the piezoelectric vibrator's temperature-dependent resonant frequency characteristics, the circuit automatically adjusts its operating parameters in response to temperature changes, combining the oscillation and temperature compensation functions into a single integrated system without requiring separate temperature-sensitive elements
2Reliability
If a temperature-sensitive element is provided in the angular velocity sensor for temperature compensation, then the detection sensitivity over temperature range is improved, but the device complexity and manufacturing difficulty increase
Solution Approach 1:
The patent removes the temperature-sensitive element from the device structure. The temperature compensation function is achieved by relying on the natural temperature characteristics of the piezoelectric vibrator's resonant frequency, which inherently compensates for circuit constant variations without requiring additional components, thereby simplifying the device structure
Solution Approach 2:
The piezoelectric vibrator serves its dual function: it not only generates the oscillation signal but also provides temperature compensation through its inherent temperature-dependent resonant frequency characteristics. This self-service approach eliminates the need for separate temperature compensation components and reduces device complexity
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach allows for highly stable angular velocity detection sensitivity without using temperature-sensitive elements, enhancing the sensor's performance and productivity in compact designs.
Implementation Method 1
an angular velocity sensor which detects a voltage caused by vibrations of a piezoelectric vibrator occurring due to the Coriolis force
Implementation Method 2
detects a voltage caused by the vibrations of the piezoelectric vibrator that occur due to the Coriolis force
Data Source
AI summary
In a method of setting temperature characteristics of an angular velocity sensor, temperature characteristics of a detuning frequency are acquired. The detuning frequency is a frequency difference between an oscillation frequency of an oscillation circuit including a piezoelectric vibrator and a frequency of a voltage of the piezoelectric vibrator caused by the Coriolis force. The sensitivity to the detuning frequency is acquired. The temperature characteristics of a detection phase are acquired. The detection phase is a phase difference between a Coriolis signal phase that corresponds to a phase angle of a voltage signal and an oscillation signal phase of the oscillation circuit. The sensitivity to the detection phase is acquired. The amount of phase shift of the detection phase is determined so that the change in sensitivity caused by the change in the detuning frequency with temperature is controlled using the change in sensitivity caused by the change in the detection phase with temperature.