Mg-Li Alloy Reflective Optical Element for Vibration Damping
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Solution Overview
Problem
Reflective optical systems used in moving bodies like cars and drones face degradation in optical performance due to low damping capacity of aluminum and its alloys, which are prone to vibration-related issues.
Innovation Solution
A reflective optical element with a resin layer on a metal substrate, featuring a Mg—Li alloy as the primary component, which provides improved damping capacity and maintains optical performance under vibrations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of moving object
If aluminum or aluminum alloy is used as the substrate material for the mirror, then the mirror achieves lightweight property and low cost, but the damping capacity is insufficient causing degradation in optical performance under vibration
Solution Approach 1:
The patent applies composite materials by combining magnesium alloy substrate with resin coating layers. The magnesium alloy provides superior damping capacity compared to aluminum, while the resin layers (including optical resin and protective resin) provide optical precision and surface protection. This composite structure resolves the contradiction by selecting a different base material (magnesium alloy instead of aluminum) that inherently provides better vibration damping while maintaining lightweight properties.
2Ease of manufacture
If the mirror substrate is made lightweight using aluminum, then manufacturing cost is reduced, but vibration resistance and damping capacity deteriorate
Solution Approach 1:
The patent changes the material parameter from aluminum alloy to magnesium alloy for the substrate. This parameter change fundamentally alters the damping characteristics while maintaining manufacturability. The magnesium alloy substrate can be manufactured using similar die-casting processes as aluminum, keeping manufacturing costs reasonable while dramatically improving vibration resistance and damping capacity.
3Manufacturing precision
If a resin layer with optical surface is provided on the metal substrate, then optical precision is improved, but the structure becomes more complex
Solution Approach 1:
The patent applies local quality by providing resin coating layers only on the optical surface areas where precision is required, rather than making the entire mirror structure complex. The optical resin layer is applied selectively to create the precision optical surface, while the protective resin layer is applied only where needed for surface protection. This localized approach achieves high optical precision without unnecessarily increasing overall structural complexity.
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 effectively attenuates vibrations, reducing the degradation of imaging devices and maintaining optical performance in applications with high vibration levels, while being lightweight and cost-effective.
Implementation Method 1
the metal substrate includes an alloy containing Mg as a main component... effectively attenuates vibrations, reducing the degradation of imaging devices
Implementation Method 2
a reflective film is provided on the optical surface... configured to reflect the light taken in from the first opening
Data Source
AI summary
Provided is a reflective optical element that is lightweight and excellent in damping capacity. In the reflective optical element, a resin layer having an optical surface is formed on a metal substrate, and a reflective film is formed on the optical surface, and also, the metal substrate includes an alloy containing Mg as a main component.