Prism Motor Capacitance Sensing for Accurate Dual-Axis Shake Prevention
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Prism motors in periscope lens designs suffer from low shake prevention accuracy due to the non-linear relationship between capacitance change and prism carrier position, leading to inaccurate position detection.
Innovation Solution
A prism motor design with a base, prism carrier, first and second electrode plates, and a floating electrode plate, where capacitance values are used to accurately determine the rotation angle of the prism carrier relative to the base, enhancing shake prevention accuracy through dual-axis high-precision positioning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional capacitance detection method is used in prism motor, then device complexity is reduced, but measurement precision deteriorates due to non-linear relationship between capacitance change and prism carrier position
Solution Approach 1:
The detection system is segmented into multiple independent capacitance detection channels, each responsible for detecting capacitance changes in specific directions. By dividing the detection task into multiple segments, the system achieves high-precision position detection while maintaining relatively simple individual detection units.
Solution Approach 2:
The patent replaces complex mechanical position detection mechanisms with capacitance-based electrical detection. By using capacitance changes to infer position information through calculation, the system eliminates the need for complex mechanical sensors while achieving high measurement precision.
2Reliability
If prism motor is used for shake prevention, then device thickness is reduced through periscope design, but reliability deteriorates due to low shake prevention accuracy
Solution Approach 1:
The system implements feedback control by continuously monitoring capacitance changes, calculating the prism carrier's position and shaking displacement, and using this information to drive the prism carrier in the opposite direction to counteract shaking. This closed-loop feedback mechanism significantly improves shake prevention accuracy.
Solution Approach 2:
The prism motor system performs self-positioning and self-correction by using its own capacitance detection capability to identify shaking displacements and automatically compensate for them through reverse driving, eliminating the need for external complex control systems.
3Measurement precision
If simple capacitance detection is used, then manufacturing precision requirements are reduced, but measurement precision deteriorates due to inability to accurately determine rotation angle
Solution Approach 1:
The patent introduces capacitance change as an intermediary parameter to indirectly measure the rotation angle and position of the prism carrier. Instead of directly measuring position with high-precision mechanical sensors, the system uses easily measurable capacitance changes and calculates position information through mathematical relationships, reducing manufacturing precision requirements.
Solution Approach 2:
The system changes the measurement parameter from direct mechanical position measurement to electrical capacitance measurement. By detecting capacitance changes that occur with prism carrier movement and using these changes to calculate position, the system achieves high measurement precision while relaxing manufacturing precision requirements for the detection components.
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
The design enables accurate calculation of the prism carrier's position, allowing the driving assembly to offset shaking displacements, thereby improving shake prevention accuracy and stability.
Implementation Method 1
capacitance values are used to accurately determine the rotation angle of the prism carrier relative to the base
Data Source
AI summary
A prism motor, a method for detecting a rotation angle of a prism motor, and a camera device are provided. The prism motor includes: a base, a prism carrier, a first electrode plate, a plurality of second electrode plates, and a floating electrode plate. The base includes a base plate, the prism carrier is disposed above the base plate and configured to carry a prism, the prism carrier is rotatable relative to the base about each of a first rotation axis and a second rotation axis, the first rotation axis and the second rotation axis are both parallel to a surface of the base plate, and an intersection point of the first rotation axis and the second rotation axis is a rotation center. The first electrode plate is located on a surface of the base.