Piezoelectric Optical Deflector Sensor Placement
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Solution Overview
Problem
Existing two-dimensional optical deflectors with piezoelectric actuators face reduced deflection angles due to the presence of sense elements, which weaken the rocking force and hinder high-frequency signal detection due to increased wiring resistance.
Innovation Solution
The optical deflector design incorporates piezoelectric sensors on the fixed frame near the actuators, eliminating sense elements within the actuators and optimizing the frame structure for enhanced vibration propagation, allowing stronger rocking forces and improved high-frequency signal detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If sense elements are provided in the piezoelectric actuators, then the deflection control accuracy is improved, but the rocking force of the piezoelectric actuators is weakened
Solution Approach 1:
The patent divides the sensing function from the actuating function by placing sense elements on the fixed frame separate from the piezoelectric actuators. This segmentation allows the actuators to provide full rocking force without the weight and structural constraints of integrated sense elements, while still achieving accurate deflection control through separate sensing of the mirror's angular position.
2Reliability
If long wiring lines are connected to the drive elements, then the connectivity is ensured, but the resistance of the wiring lines is increased
Solution Approach 1:
The fixed frame acts as an intermediary structure that mechanically transmits vibrations from the piezoelectric actuators to the sense elements mounted on it. This eliminates the need for long wiring lines connecting sense elements to actuators, as the sensing is performed locally at the fixed frame where vibrations are efficiently transmitted through the frame structure itself.
3Strength
If the fixed frame is made thicker for structural strength, then the strength is improved, but the propagation of rocking vibration to the piezoelectric sensor is hindered
Solution Approach 1:
The patent applies local quality by making the fixed frame thinner only in the specific region where the piezoelectric sensor is mounted to enhance vibration propagation, while maintaining adequate thickness in other regions for overall structural strength. This localized thinning allows efficient transmission of rocking vibrations from the piezoelectric actuators to the sensor without compromising the global structural integrity of the frame.
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 strengthens the rocking force of the piezoelectric actuators and enhances the detection of high-frequency signals, leading to more accurate deflection control and increased deflection angles.
Implementation Method 1
a piezoelectric actuator connected to the fixed frame for rocking the mirror with respect to an axis of the mirror
Implementation Method 2
at least one piezoelectric sensor is provided on the fixed frame to sense a rocking vibration of the mirror caused by the piezoelectric actuator
Data Source
AI summary
In an optical deflector including a mirror, a fixed frame, and a piezoelectric actuator connected to the fixed frame for rocking the mirror with respect to an axis of the mirror, at least one piezoelectric sensor is provided on the fixed frame to sense a rocking vibration of the mirror caused by the piezoelectric actuator.