Lens Dyeing Base Pattern for Uniform Color on Curved Lenses
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Solution Overview
Problem
Existing lens dyeing methods, such as the vapor deposition transfer method, face challenges in achieving uniform color density due to differences in curvature and power of spectacle lenses, leading to irregular dye deposition on lens surfaces.
Innovation Solution
A method and apparatus that determine and form a print area on a dyeing base body with a diameter larger than the lens surface, featuring concentrically changing color density from the central to the peripheral portion, applied under vacuum conditions, ensuring uniform dye deposition across the lens surface.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the vapor deposition transfer dyeing method is used to deposit dyes onto a lens, then the lens can be dyed without direct contact with dyeing solution, but uniform color density cannot be achieved on lenses with large curvature or high power due to significant distance differences between central and peripheral portions
Solution Approach 1:
The patent applies local quality by creating a non-uniform color density distribution in the print area, where the central portion has higher color density and the peripheral portion has lower color density. This gradient distribution compensates for the distance difference between central and peripheral regions during vapor deposition, ensuring uniform color density on the lens surface despite curvature variations.
Solution Approach 2:
The patent changes the color density parameter across different regions of the print area. By adjusting the color density from central to peripheral portions, the invention compensates for the geometric effects of lens curvature and power, achieving uniform dye deposition across the entire lens surface.
2Area of stationary object
If the print area diameter is increased to cover the entire lens surface, then complete lens coverage is achieved, but color density uniformity deteriorates due to excessive distance variation from the base body to different lens regions
Solution Approach 1:
The patent makes different regions of the print area have different color density properties. The central region has higher color density while the peripheral region has lower color density, creating a gradient that compensates for the distance variation across the large print area, thereby maintaining color density uniformity on the lens surface.
Solution Approach 2:
The patent introduces asymmetry in the color density distribution within the print area. Instead of uniform color density, the invention creates an asymmetric gradient pattern where color density varies from center to periphery, matching the asymmetric distance distribution caused by lens curvature.
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 ensures almost uniform color density on lenses of varying powers and curvatures, minimizing differences in color density between the central and peripheral portions, thereby improving dyeing consistency and quality.
Implementation Method 1
a dyeing ink containing a sublimable dye is applied onto the base body to form the determined print area
Implementation Method 2
heating the base body to deposit the dye onto the lens
Data Source
AI summary
A lens dyeing method comprising the steps of: (a) determining a print area to be formed on a dyeing base body based on information entered to dye a predetermined area of a surface of a lens to be dyed with desired hue and almost uniform color density so that the print area has a diameter larger than that of the lens surface area and the color density of the print area concentrically changes from a central portion to a peripheral portion in a stepwise or linear manner; (b) applying a dyeing ink containing a sublimable dye onto the base body to form the determined print area on one surface of the base body; and (c) placing the base body and the lens so that the print area formed surface and the lens surface area to be dyed face each other in noncontact relation under substantially a vacuum condition, and heating the base body to deposit the dye onto the lens.