Piezoelectric Light Deflector Rib Structure for Oscillation Control
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Solution Overview
Problem
Existing light deflectors, such as those used in optical scanning systems and LiDAR devices, face limitations in the angle of oscillation per unit voltage, which affects their efficiency and precision in scanning and imaging applications.
Innovation Solution
The design incorporates a rib structure on the connecting parts of the light deflector with orthogonal portions that restrict deformation in one direction, enhancing the X-directional flexural rigidity and allowing for increased oscillation angles by directing the contraction of piezoelectric drive elements effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the connecting part is made flexible to allow oscillation, then the oscillation capability is improved, but the structural stability deteriorates
Solution Approach 1:
The connecting part has different rigidity characteristics in different directions: high rigidity in the X-direction (parallel to the drive element's contraction direction) to maintain structural stability, and low rigidity in the Y-direction (orthogonal to the contraction direction) to enable oscillation. This anisotropic rigidity is achieved through the specific rib configuration that restricts deformation only in the X-direction while allowing free deformation in the Y-direction.
2Stability of the object's composition
If the rib structure restricts deformation in X-direction, then the structural stability is improved, but the oscillation angle deteriorates
Solution Approach 1:
The patent optimizes the geometric parameters of the rib structure, including the rib thickness, height, and spacing, to achieve the desired balance between structural stability and oscillation angle. By carefully controlling these parameters, the rib provides sufficient rigidity in the X-direction while minimizing its restraining effect on oscillation in the Y-direction, thereby achieving both structural stability and adequate oscillation angle.
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 increases the angle of oscillation of the mirror unit per unit voltage, improving the efficiency and precision of light deflection in optical scanning systems and LiDAR devices.
Implementation Method 1
a piezoelectric drive circuit to generate drive force to cause the mirror to twist and oscillate around the rotation axis
Data Source
AI summary
A light deflector includes a stationary part; a movable unit having a reflecting surface; a connecting part between the movable unit and the stationary part; a drive unit disposed on a first surface of the connecting part, the drive unit configured to deform the connecting part to oscillate the movable unit; and a rib disposed on a second surface of the connecting part, the second surface being an opposite surface of the first surface. The rib includes a portion whose longitudinal direction is orthogonal to a direction at which the connecting part is bent.