Interference Filter Color Matching for Ophthalmic Lenses
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Solution Overview
Problem
Existing interference filters on optical articles, such as ophthalmic lenses, exhibit color variability issues when used in pairs, leading to undesirable reflection colors, particularly in spectacles where two lenses are close together, affecting aesthetic and branding considerations.
Innovation Solution
A method to determine and control colorimetric characteristics in reflection of interference filters by using a computer-programmed apparatus, which measures and simulates the desired reflection factors, including visual and average reflectance, to match the color perception of an object, such as a spectacle frame, ensuring the interference filter reflects a color identical to the object, achieved by determining the physical characteristics of the filter's layers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If interference filters are deposited on optical articles to achieve specific reflection effects, then aesthetic appearance and functional performance are improved, but color variability between lenses occurs leading to inconsistent perception
Solution Approach 1:
The method performs preliminary determination of colorimetric characteristics and simulation of reflection factors before actual filter deposition. By calculating the required physical characteristics of interference layers in advance based on desired colorimetric targets, the process ensures color consistency is built into the manufacturing parameters before production occurs
Solution Approach 2:
The method establishes a feedback loop where colorimetric measurements of the object are used to determine target characteristics for the interference filter. The simulation step predicts the reflection behavior, allowing adjustments to be made before deposition to ensure the reflected color matches the object's color, thereby maintaining color perception reliability
2Ease of manufacture
If traditional deposition methods are used without colorimetric control, then manufacturing simplicity is maintained, but color variability and aesthetic consistency deteriorate
Solution Approach 1:
The method replaces direct mechanical control of deposition parameters with a computational approach. By using colorimetric measurements and optical simulation to determine the required physical characteristics, the system substitutes complex mechanical trial-and-adjustment processes with calculated parameters that can be directly applied to the deposition process
Solution Approach 2:
The method transforms the control approach by changing from direct control of deposition parameters to control through colorimetric parameters. The physical characteristics of interference layers are determined as a function of colorimetric characteristics, allowing manufacturers to specify desired colors and have the system calculate the appropriate physical parameters for deposition
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 consistent color perception of the interference filter's reflection, matching the object's color, thereby addressing color variability issues and allowing for specific brand or company-associated colors to be achieved, enhancing aesthetic appeal and brand recognition.
Implementation Method 1
interference filters (made in the form of interference stacks) deposited for example on an optical article
Data Source
Figure 1~3
AI summary
The invention relates to a method for determining colour characteristics reflected by an interference filter, said method comprising the following steps: determination (E30) of colour coordinates of an object; and determination (E32, E34) of at least one colour characteristic (C*f) reflected by the interference filter according to the determined colour coordinates, respecting an isoperception law. The invention relates to a method for depositing such an interference filter and to an assembly consisting of an interference filter and an object.