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Micro Aspheric Convex Lenses Fabricated by Precise Scraping
1Department of Mechanical and Computer-Aided Engineering, Feng Chia University, Taichung 407102, Taiwan.
Micromachines
|May 28, 2022
Summary
A new method uses a microshaper and computer numerical control (CNC) machining to create precise microconvex aspherical lenses. This technique offers efficient fabrication and improved imaging compared to traditional spherical lenses.
Area of Science:
- Optics and Photonics
- Manufacturing Engineering
- Materials Science
Background:
- Fabricating micro-aspherical lenses with high precision is challenging.
- Existing methods may be slow, expensive, or lack accuracy.
Purpose of the Study:
- To develop an easy, fast, and inexpensive method for fabricating microconvex aspherical lenses.
- To demonstrate precise machining of aspheric surfaces using a novel algorithm.
Main Methods:
- Utilizing a microshaper with a small knife nose mounted on a computer numerical control (CNC) machine.
- Developing and applying a cutter-path planning algorithm with knife interference compensation.
- Employing a simple polishing method to reduce surface roughness.
Main Results:
- Successfully fabricated three conic section aspheric surfaces (ellipsoid, paraboloid, hyperboloid) with high precision.
- Reduced surface roughness from 143/346 nm to 52/44 nm after polishing.
- Demonstrated that aspherical lenses provide better image quality than spherical ones.
Conclusions:
- The developed microshaper and algorithm enable precise and efficient fabrication of micro-aspherical lenses.
- The method is suitable for producing aspherical lenses with specific functions.
- This approach offers a viable solution for advanced optical component manufacturing.
