Spectacle Lens Laser Marking on Low-Reflectance AR Coatings
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Solution Overview
Problem
Existing methods for processing spectacle lenses with anti-reflection films on both surfaces face challenges in achieving precise and efficient processing without damaging the underlying layers, especially when using laser technology.
Innovation Solution
The method involves selecting the surface with a relatively low reflectance for a specific wavelength range and performing laser irradiation using a laser beam within that range to achieve precise marking and decoration on the spectacle lens, while minimizing damage to the anti-reflection film and underlying layers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If laser output is increased to improve processing efficiency, then processing speed increases, but processing uniformity deteriorates and damage occurs to the underlying layer
Solution Approach 1:
The patent applies parameter changes by selecting a specific laser wavelength (355 nm ultraviolet) that optimizes the balance between processing efficiency and precision. This wavelength parameter enables effective film removal while maintaining processing uniformity and preventing underlying layer damage, resolving the contradiction between increased productivity and manufacturing precision.
2Use of energy by moving object
If ultraviolet or infrared wavelength is used to improve energy penetration, then energy reaches the target material, but processing precision deteriorates due to insufficient energy focus
Solution Approach 1:
The patent resolves this contradiction by selecting a specific ultraviolet wavelength (355 nm) that optimizes both energy penetration and processing precision. This wavelength parameter provides sufficient energy to reach and remove the anti-reflection film while maintaining focused energy delivery for precise processing, avoiding the precision losses associated with other wavelengths.
3Ease of manufacture
If laser processing is performed on the surface with high reflectance, then processing can be attempted, but energy absorption decreases and processing effectiveness deteriorates
Solution Approach 1:
The patent resolves this contradiction by selecting a laser wavelength (355 nm ultraviolet) that minimizes reflectance and maximizes absorption by the anti-reflection film. This wavelength parameter ensures effective energy coupling with the film material, enabling both feasible and highly effective processing without requiring excessive laser power.
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 approach allows for precise and efficient processing of spectacle lenses with anti-reflection films on both surfaces, enabling effective decoration and marking without compromising the lens's optical quality or functionality.
Implementation Method 1
One possible method for forming a desired pattern such as a letter on a spectacle lens is to partially remove a film formed on the surface of the lens by irradiating it with laser beam.
Data Source
AI summary
A method for manufacturing a spectacle lens and a related technique thereof, includes: performing desired marking processing by irradiating one surface of a spectacle lens with laser, the spectacle lens having an object-side surface and an eyeball-side surface each having a different anti-reflection film, the marking processing including: determining an applicable wavelength of the laser to be used; selecting a surface with an anti-reflection film having a relatively low reflectance to the applied wavelength, out of the object-side surface and the eyeball-side surface; and performing laser irradiation to the selected surface using the applied wavelength.