Bulging Fresnel Patch for Optical Power Modification
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Solution Overview
Problem
Existing optical patches that modify the power of optical components, such as eyeglasses, cause image distortions and optical aberrations due to their flat shape and relief structure, which makes them unsuitable for ophthalmic applications, especially when dirt accumulates on the raised surfaces, degrading image quality.
Innovation Solution
A patch with a bulging shape, featuring Fresnel zones with jumps in height that match the curvature of the optical component, ensuring minimal deformation and easy cleaning, reducing image distortions and optical aberrations, and allowing for significant optical power modifications without compromising image quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If a flat patch with Fresnel zones is applied to a curved optical component, then the optical power can be modified, but image distortions and optical aberrations occur due to deformation of the patch
Solution Approach 1:
The patch is designed with a bulging shape that has a mean curvature matching the curvature of the optical component surface. This curvature matching ensures that when the patch is applied to the curved surface, it maintains its shape without deformation, thereby preventing image distortions and optical aberrations while still providing the required optical power modification through the Fresnel zones
2Ease of manufacture
If the smooth face of the patch is used for adhesion to the optical component, then the patch can be attached, but dirt accumulates on the raised Fresnel zones causing light diffusion and image distortion
Solution Approach 1:
The invention inverts the conventional design by making the smooth face the one that contacts the optical component and the bulging face with Fresnel zones the exposed surface. This inversion allows the smooth face to provide clean adhesion while the bulging Fresnel zones are positioned to be easily cleanable, preventing dirt accumulation that would cause light diffusion and image distortion
3Power
If a flat patch is used to achieve high optical power modification, then significant power change is possible, but image distortions become more severe
Solution Approach 1:
The patch incorporates a bulging shape with matched curvature to the optical component, which allows high optical power modifications to be achieved without severe image distortions. The curvature matching ensures the patch remains undeformed on the curved surface, maintaining image quality even when significant power changes are provided by the Fresnel zones
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 bulging shape of the patch minimizes image distortions and optical aberrations, even with high optical power modifications, and the design allows for easy cleaning, maintaining image quality and user comfort.
Implementation Method 1
the patch itself has an optical power that results from the refraction of the light rays on the two faces of the patch in each Fresnel zone
Implementation Method 2
The smooth face of each patch, which is situated on the side opposite to the jumps in height, allows for an adhesion of the patch to the eyeglass by capillarity or by electrostatic effect
Implementation Method 3
The smooth face of each patch, which is situated on the side opposite to the jumps in height, allows for an adhesion of the patch to the eyeglass by capillarity or by electrostatic effect
Data Source
AI summary
A disk enabling modification of the power of an optical component consists of a Fresnel lens. The disk is initially formed with a general rounded shape which corresponds to the shape of the optical component. In this way, the disk does not lose its shape or does not lose it very much when it is applied against the component. It does not cause image distortion or optical aberration when an object is observed through the component provided with the disk. Such a disk is particularly adapted to obtain correction of ametropia or to a solar mask initially lacking optical power.