Mirror Driving Mechanism with Segmented Base for Thermal Stability
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Solution Overview
Problem
Mirror driving mechanisms in optical modules face challenges in stabilizing the swing of mirrors due to temperature fluctuations, affecting the precision and stability of scanning operations.
Innovation Solution
A mirror driving mechanism with a temperature detecting section installed on the base portion, allowing for precise temperature detection and control, which includes a plate-shaped base with a thin and thick portion, and shafts for swingable support, utilizing piezoelectric elements for resonance-based swinging, and an electronic temperature adjusting module to maintain optimal temperature ranges.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the mirror is made swingable using resonance with a simple base structure, then the device complexity is reduced, but the stability of the mirror swing deteriorates due to temperature fluctuations
Solution Approach 1:
The base portion is segmented into a thin portion and a thick portion with different thermal properties. The thin portion provides flexibility for resonance-based swinging, while the thick portion provides thermal mass for temperature stabilization, resolving the contradiction between simple structure and swing stability.
Solution Approach 2:
Different portions of the base have different thicknesses and thermal characteristics. The thin portion near the mirror allows easy swinging, while the thick portion provides thermal stability. This local differentiation resolves the contradiction between structural simplicity and operational stability.
2Reliability
If temperature control is added to stabilize mirror swing, then the swing stability is improved, but the device complexity increases
Solution Approach 1:
The thick portion of the base portion serves dual functions: structural support and thermal regulation. By utilizing the inherent thermal mass of the thick portion, the system achieves temperature stabilization without requiring additional active temperature control components, thus improving swing stability while avoiding increased device complexity.
3Volume of moving object
If the base portion is made thinner to reduce size, then the module size is reduced, but the temperature stability deteriorates
Solution Approach 1:
The base is divided into thin and thick portions, allowing the overall module size to be reduced while maintaining a localized thick portion for thermal stability. This segmentation resolves the contradiction between compact size and temperature stability.
Solution Approach 2:
The thick portion is strategically positioned to provide thermal stability only where needed, while the rest of the structure remains thin for compactness. This local quality approach resolves the contradiction between module size and temperature stability.
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 solution enables stable and precise swinging of mirrors, enhancing the stability and accuracy of optical module operations, even under varying temperature conditions, and allows for two-dimensional drawing capabilities while reducing the module's size.
Implementation Method 1
The mirror is supported by the first shaft portion so as to be swingable due to resonance
Implementation Method 2
utilizing piezoelectric elements for resonance-based swinging
Data Source
AI summary
A mirror driving mechanism includes a plate-shaped base portion, a mirror that is installed at the base portion, and a temperature detecting section that is installed at the base portion and that detects a temperature of the base portion. The base portion includes a thin portion that is disposed away from an outer edge of the base portion and that has a through hole extending through the base portion in a plate-thickness direction of the base portion, a thick portion that is connected to the thin portion, that is thicker than the thin portion in the plate-thickness direction of the base portion, and that extends along the outer edge so as to surround the thin portion, and a first shaft portion extends into the through hole from an outer periphery of the through hole.