Dual-Axis Optical Deflector Structure for Larger Scan Angles
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Solution Overview
Problem
Existing optical deflectors have limitations in increasing the deflection angle of light beyond a certain ratio, which affects the efficiency and versatility of applications such as head-up displays and laser headlamps.
Innovation Solution
A movable device with a supporting portion and a movable portion that can rotate about two intersecting axes, utilizing piezoelectric drive units and strategically designed openings in the connection portions to enhance the deflection angle and oscillation efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If the aspect ratio of the dispersion surface is increased to more than four, then the deflection angle enlargement ratio increases by more than four times, but the device complexity and manufacturing difficulty increase
Solution Approach 1:
The dispersion surface is divided into multiple regions with different aspect ratios. The first dispersion surface has an aspect ratio of 1.5-3.0, while the second dispersion surface has an aspect ratio of 3.0-6.0. This segmentation allows the system to achieve high deflection angle enlargement (more than four times) without requiring a single overly complex structure, thereby reducing overall device complexity while maintaining performance.
2Shape
If the aspect ratio of the dispersion surface is increased to more than four, then the deflection angle enlargement ratio increases by more than four times, but the manufacturing precision requirements increase
Solution Approach 1:
By dividing the dispersion surface into multiple regions with different aspect ratios, the manufacturing precision requirements are distributed across smaller, more manageable sections. Each region can be manufactured with standard precision tolerances rather than requiring ultra-precise manufacturing across the entire large aspect ratio surface, thus reducing overall manufacturing precision requirements while achieving the desired deflection angle enlargement.
Solution Approach 2:
Different regions of the dispersion surface are designed with different local qualities (different aspect ratios) optimized for their specific functions. The first dispersion surface region uses an aspect ratio of 1.5-3.0 for certain optical paths, while the second region uses 3.0-6.0 for other paths. This local optimization allows each region to be manufactured with appropriate local precision requirements rather than uniformly high precision across the entire structure.
3Shape
If a movable portion is added to increase deflection angle, then the deflection angle increases, but the device size increases
Solution Approach 1:
The first and second dispersion surfaces are integrated within a nested structure where the movable portion is positioned to adjust the optical path through both dispersion surfaces. The first dispersion surface is arranged first in the optical path, followed by the second dispersion surface, creating a compact nested arrangement that achieves increased deflection angle without proportionally increasing device volume.
Solution Approach 2:
The invention utilizes multi-dimensional arrangement of the dispersion surfaces and movable portion to achieve high deflection angle in a compact footprint. By arranging the first and second dispersion surfaces at different positions and orientations in three-dimensional space, and using the movable portion to dynamically adjust the optical path between them, the system achieves enhanced deflection capability without linearly increasing device size.
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 solution enables a significant increase in the deflection angle, allowing for more efficient and versatile applications in head-up displays, laser headlamps, and other devices by reducing power consumption and minimizing the overall size.
Implementation Method 1
utilizing piezoelectric drive units
Data Source
AI summary
A movable device includes a supporting portion; a movable portion in the supporting portion, the movable portion movable about a first rotation axis and a second rotation axis intersecting with the first rotation axis; a member between the movable portion and the supporting portion and connected to the movable portion and the supporting portion in a connection direction. The member includes: a drive unit configured to move the movable portion; and an opening in a part of the drive unit.