Capacitance Sensing for Anti-Vibration Actuator Position Measurement
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Solution Overview
Problem
The implementation of magnetic field sensors in anti-vibration actuators for gyro stabilization increases costs and form factor, limiting the efficiency of the rotor and other components, which is undesirable for precise autofocus and image stabilization in camera systems.
Innovation Solution
The use of capacitance sensing between a rotor plate attached to a rotor and a stator plate attached to a stator to measure the position of opposite rotation, allowing for reduced costs and form factor compared to magnetic field sensors, by calculating distance change values based on measured capacitance and controlling the rotor accordingly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If magnetic field sensors are implemented in the anti-vibration actuator for gyro stabilization, then the position measurement capability is improved, but the cost and form factor increase
Solution Approach 1:
The patent replaces magnetic field sensors with a capacitance sensing system that uses electric field interactions between a rotor plate and stator plate. This substitution eliminates the need for complex magnetic sensing components while achieving the same position measurement function through capacitance changes that correlate with rotor position.
Solution Approach 2:
The patent changes the measurement parameter from magnetic field strength to capacitance value. By measuring capacitance between the rotor plate and stator plate, the system can determine rotor position through electrical parameter changes rather than magnetic field detection, simplifying the overall device structure.
2Manufacturing precision
If magnetic field sensors are used for measuring rotor position, then the stabilization precision is improved, but the rotor efficiency is reduced due to increased form factor
Solution Approach 1:
The patent replaces magnetic field sensors with a capacitance sensing system that uses electric field interactions between a rotor plate and stator plate. This substitution eliminates the need for complex magnetic sensing components while achieving the same position measurement function through capacitance changes that correlate with rotor position.
Solution Approach 2:
The rotor plate serves dual functions: it is both a functional component of the anti-vibration actuator and a capacitance sensing element. This multi-functionality eliminates the need for separate sensing components, reducing form factor and maintaining rotor efficiency while still achieving precise stabilization.
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 reduces the cost and form factor of the anti-vibration actuator, enhancing its efficiency and enabling more precise control for autofocus and image stabilization in camera systems.
Implementation Method 1
measuring, at a capacitance sensing circuit, the capacitance between the rotor plate and the stator plate
Data Source
AI summary
In accordance with the present disclosure, a method for controlling an anti-vibration actuator is provided such that the position of the applied opposite rotation in a gyro stabilization process can be measured using capacitance sensing. In some embodiments, a rotor plate attached to a rotor and a stator plate attached to a stator can be used to create a capacitance. When the rotor moves, a distance change value of the rotor can be calculated based on the capacitance measured between the rotor plate and the stator plate. In these embodiments, the cost and the form factor of the aforementioned anti-vibration actuator are reduced compared to implementation of magnetic field sensors in the anti-vibration actuator.