Laser Polishing Liquid Lens Cavities for Surface Roughness Control
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Solution Overview
Problem
Conventional methods for forming conical features in liquid lenses are process-intensive and costly, leading to high susceptibility to yield loss and instability due to surface roughness, which affects the electric field and functionality of the lenses.
Innovation Solution
A method involving laser polishing of glass, glass-ceramic, or ceramic plates to achieve a sidewall surface roughness of less than 20 nanometers and a specific angle between the sidewall and base, using laser beams with controlled power and polarization to create smooth and linear cavities within liquid lenses.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional mechanical polishing and grinding steps are used to control the smoothness of conical features, then the surface roughness is improved, but the manufacturing cost and process complexity increase
Solution Approach 1:
The patent replaces conventional mechanical polishing and grinding systems with an electrostatic-based system. A biased electrode generates an electrostatic field that acts on charged abrasive particles in a fluid stream, enabling non-contact material removal and surface smoothing. This substitution eliminates complex mechanical contact systems while achieving the required surface roughness control.
Solution Approach 2:
The invention utilizes a fluid stream (aerosol or liquid) carrying abrasive particles through a nozzle onto the conical feature surface. The fluid delivery system replaces mechanical polishing tools, allowing controlled material removal and surface finishing through fluid-dynamic and electrostatic interactions rather than mechanical contact.
2Manufacturing precision
If conventional mechanical polishing and grinding steps are used to control the smoothness of conical features, then the surface roughness is improved, but the manufacturing cost increases
Solution Approach 1:
The patent replaces conventional mechanical polishing and grinding systems with an electrostatic-based system. A biased electrode generates an electrostatic field that acts on charged abrasive particles in a fluid stream, enabling non-contact material removal and surface smoothing. This substitution eliminates complex mechanical contact systems while achieving the required surface roughness control.
Solution Approach 2:
The invention utilizes a fluid stream (aerosol or liquid) carrying abrasive particles through a nozzle onto the conical feature surface. The fluid delivery system replaces mechanical polishing tools, allowing controlled material removal and surface finishing through fluid-dynamic and electrostatic interactions rather than mechanical contact.
3Manufacturing precision
If conventional mechanical polishing and grinding steps are used to control the smoothness of conical features, then the surface roughness is improved, but the susceptibility to yield loss increases
Solution Approach 1:
The patent replaces conventional mechanical polishing and grinding systems with an electrostatic-based system. A biased electrode generates an electrostatic field that acts on charged abrasive particles in a fluid stream, enabling non-contact material removal and surface smoothing. This substitution eliminates complex mechanical contact systems while achieving the required surface roughness control.
Solution Approach 2:
The invention utilizes a fluid stream (aerosol or liquid) carrying abrasive particles through a nozzle onto the conical feature surface. The fluid delivery system replaces mechanical polishing tools, allowing controlled material removal and surface finishing through fluid-dynamic and electrostatic interactions rather than mechanical contact.
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 method reduces the cost and complexity of producing liquid lenses by achieving precise surface roughness and linearity, enhancing the stability and performance of the lenses by minimizing surface irregularities and improving the uniformity of the electric field.
Implementation Method 1
directing a laser beam from a laser against a sidewall of a cavity in a plate. The directing is conducted to polish the sidewall to an average surface roughness (Ra) of less than or equal to 20 nanometers (nm)
Data Source
AI summary
A liquid lens that includes: a lens body comprising a first window, a second window, and a cavity disposed between the first window and the second window; and a first liquid and a second liquid within the cavity of the lens body, the first liquid and the second liquid substantially immiscible with each other and having different refractive indices such that an interface between the first liquid and second liquid to form a lens. The sidewall of the cavity has an average surface roughness (Ra) of less than or equal to 200 nanometers (nm). The cavity is disposed within a plate. Further, each of the windows and the plate comprises a glass, glass-ceramic or ceramic composition. In addition, a linearity of a first bottom portion of the sidewall in proximity to the base of the plate can be from 0 μm±5 μm.