Piezo Optical Mirror Resonance Stability
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Solution Overview
Problem
Conventional optical reflective elements that cause laser light illumination to reciprocate are prone to instability due to disturbance vibrations, especially in environments like cars, which can transmit vibrations and prevent stable operation.
Innovation Solution
An optical reflective element design featuring a reflective body that rotationally oscillates about a first rotational axis, coupled with vibration and driving bodies, including piezoelectric elements, and a base that allows for antiphase vibration of connector bodies to mitigate disturbance vibrations, enhancing durability and resonance sharpness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a polygon mirror is rotated by a motor to cause laser light illumination to reciprocate, then the illumination position can be controlled, but the device becomes larger, heavier, and consumes more electric power
Solution Approach 1:
The patent replaces the motor-driven mechanical rotation system with a piezoelectric actuation system. The piezoelectric element converts electrical signals directly into mechanical vibrations that cause the reflective body to oscillate, eliminating the need for motors, gears, and other mechanical transmission components, thereby reducing weight and power consumption while maintaining illumination position control capability
Solution Approach 2:
The patent changes the operating parameters from continuous motor rotation to piezoelectric vibration-induced oscillation. By controlling the frequency and amplitude of the piezoelectric vibration, the reflective body achieves stable rotational oscillation without requiring the large mechanical systems needed for motor-driven operation, thus reducing device size and weight
2Ease of operation
If a polygon mirror is rotated by a motor to cause laser light illumination to reciprocate, then the illumination position can be controlled, but the device consumes more electric power
Solution Approach 1:
The patent replaces the motor-driven mechanical rotation system with a piezoelectric actuation system. The piezoelectric element converts electrical signals directly into mechanical vibrations that cause the reflective body to oscillate, eliminating the need for motors, gears, and other mechanical transmission components, thereby reducing weight and power consumption while maintaining illumination position control capability
Solution Approach 2:
The patent employs periodic piezoelectric vibrations to induce rotational oscillation of the reflective body. The piezoelectric element is driven at specific frequencies that resonate with the reflective body's natural oscillation mode, creating stable rotational motion through periodic vibration rather than continuous motor power, thus significantly reducing energy consumption
3Weight of moving object
If vibration bodies are coupled to the connector body to cause rotational oscillation, then the device becomes smaller and lighter, but disturbance vibrations from external sources prevent stable operation
Solution Approach 1:
The patent introduces a counterweight mechanism that balances the reflective body and connector body assembly. By adding a counterweight component, the system achieves better mechanical balance that reduces the impact of external disturbance vibrations, allowing the lightweight piezoelectric-driven system to operate stably in vibrating environments like vehicles
Solution Approach 2:
The patent incorporates vibration isolation elements and damping structures that are built into the connector body assembly. These elements provide beforehand cushioning against disturbance vibrations from external sources such as vehicle vibrations, protecting the delicate piezoelectric actuation system and reflective body from unstable operation while maintaining the lightweight design
4Reliability
If the connector body is made more rigid to resist disturbance vibrations, then stable operation is improved, but the device complexity increases
Solution Approach 1:
The patent optimizes the rigidity parameters of the connector body by carefully selecting materials and cross-sectional dimensions. By adjusting these parameters, the connector body achieves sufficient rigidity to resist disturbance vibrations without requiring excessive complexity. The design finds the optimal balance point where minimal structural complexity provides adequate vibration resistance for stable operation
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 a highly durable optical reflective element to maintain stable operation even under disturbance vibrations, with improved resonance sharpness and mechanical strength, reducing the impact of external vibrations on the reflective body's oscillation.
Implementation Method 1
driving bodies each including a piezoelectric element etc. for causing respective vibration bodies to vibrate
Data Source
AI summary
An optical reflective element includes: a reflective body that rotationally oscillates about a first rotational axis; a first connector body that is coupled to the reflective body, and includes a groove portion provided in a position in which the first rotational axis is located; a first vibration body that is disposed in a direction intersecting the first rotational axis, and is coupled to a proximal end portion of the first connector body; a second vibration body that is disposed on a side opposite the first vibration body; a first driving body that causes the first vibration body to rotate; a second driving body that is coupled to the second vibration body; and a second connector body that connects the first vibration body and the second vibration body in a manner that allows the first vibration body and the second vibration body to vibrate.