Piezoelectric Sensor Relocation for Optical Deflector Rocking Force
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Solution Overview
Problem
The existing two-dimensional optical deflectors have weakened rocking forces due to the provision of sense elements within the piezoelectric actuators, which reduces the deflection angles of the optical deflector.
Innovation Solution
The solution involves providing at least one piezoelectric sensor on the movable frame to sense the rocking vibrations of the mirror caused by the piezoelectric actuators, eliminating the need for sense elements within the actuators and thereby strengthening the rocking force.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If sense elements are provided within the piezoelectric actuators, then the actual flexing amounts can be sensed and feedback control can be achieved, but the rocking forces of the piezoelectric actuators are weakened and deflection angles are decreased
Solution Approach 1:
The sense elements are extracted from the piezoelectric actuators and relocated to the movable frame. This separation allows the actuators to exert full rocking force without the weakening effect of embedded sense elements, while the sense elements continue to monitor flexing amounts from the movable frame's perspective
Solution Approach 2:
The movable frame serves as an intermediary structure that carries the sense elements and transmits the rocking vibrations from the actuators to the sensors. This intermediary approach enables sensing functionality without compromising the actuators' force-generating capability
2Manufacturing precision
If sense elements are integrated into piezoelectric actuators, then feedback control for amplitude regulation is enabled, but the deflection angles of the optical deflector are reduced
Solution Approach 1:
The sense elements are extracted from the actuators and placed on the movable frame, allowing the actuators to achieve maximum deflection angles while the separated sense elements provide feedback for precise control through the movable frame's vibration sensing
3Reliability
If piezoelectric actuators are designed with embedded sense elements, then self-monitoring capability is achieved, but the rocking force is weakened
Solution Approach 1:
The self-monitoring function is maintained through the sense elements on the movable frame that detect actuator-induced vibrations, while the actuators themselves remain free of embedding structures that would weaken their rocking force
Solution Approach 2:
The system achieves self-monitoring through the piezoelectric sense elements that automatically detect the rocking vibrations caused by the actuators, providing feedback for control without requiring external monitoring systems
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 configuration enhances the rocking force of the piezoelectric actuators, leading to improved deflection angles and accuracy in optical deflection control.
Implementation Method 1
a first piezoelectric actuator connected between the movable frame and the mirror and adapted to rock the mirror with respect to a first axis of the mirror, a second piezoelectric actuator connected between the support body and the movable frame and adapted to rock the mirror through the movable frame with respect to a second axis of the mirror
Implementation Method 2
at least one piezoelectric sensor is provided on the movable frame and adapted to sense rocking vibrations of the mirror caused by the first and second piezoelectric actuators
Data Source
AI summary
In a two-dimensional optical deflector including a mirror, a movable frame supporting the mirror, a first piezoelectric actuator connected between the movable frame and the mirror and adapted to rock the mirror with respect to a first axis of the mirror, a support body supporting the movable frame, and a second piezoelectric actuator connected between the support body and the movable frame and adapted to rock the mirror through the movable frame with respect to a second axis of the mirror, at least one piezoelectric sensor is provided on the movable frame and adapted to sense rocking vibrations of the mirror caused by the first and second piezoelectric actuators.