Progressive Spectacle Lens Exit Section Placement
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Solution Overview
Problem
Existing spectacle lenses for display devices placed on the head of users fail to effectively provide image overlay for a wide range of users, particularly those requiring progressive power lenses, due to high aberrations in the far-field and near-field regions.
Innovation Solution
The spectacle lens is configured as a progressive power lens with the exit section positioned outside the far-field and near-field regions, utilizing a freeform surface on the rear side for ametropia correction and allowing the front side to be curved or configured as a freeform surface for additional correction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the spectacle lens uses a progressive power lens design, then it can serve users with different vision requirements (near and far field), but the far-field and near-field regions exhibit high aberrations that limit their usability
Solution Approach 1:
The patent applies local quality by creating distinct optical zones with different properties: the exit section has optimized curvature for low aberrations, while the intermediate region handles ametropia correction. This localized optimization allows each region to perform its specific function effectively, resolving the contradiction between versatility and imaging quality.
Solution Approach 2:
The progressive power lens is segmented into functionally distinct regions: an exit section for low-aberration imaging and an intermediate region for ametropia correction. This segmentation allows the lens to simultaneously provide multiple functions (image overlay and vision correction) while maintaining high imaging quality in the exit section.
2Adaptability or versatility
If the exit section is positioned in the far-field or near-field region, then it can provide ametropia correction, but the high aberrations in these regions reduce imaging quality for image overlay
Solution Approach 1:
The patent positions the exit section in a specific region with optimized curvature properties that minimize aberrations, while the ametropia correction function is handled by the intermediate region. This spatial separation of functions based on local optical quality resolves the contradiction between versatility and imaging precision.
3Manufacturing precision
If the curvature of the exit section is made different from the intermediate region, then imaging quality in the exit section improves, but ametropia correction capability may be compromised
Solution Approach 1:
The patent segments the lens into an exit section with optimized curvature for imaging and an intermediate region with curvature designed for ametropia correction. This segmentation allows both functions to coexist with high performance in their respective zones.
Solution Approach 2:
The patent combines two distinct optical functions (low-aberration imaging and ametropia correction) into a single progressive power lens structure, with each function handled by a specifically designed region. This merging maintains both imaging precision and adaptability.
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 configuration allows for effective image overlay for a broader range of users by utilizing otherwise underutilized regions of the progressive power lens, achieving superior imaging properties and minimizing astigmatic errors.
Implementation Method 1
The guiding of the light beams in the spectacle lens from the input section to the deviating section may be carried out by reflections (for example total internal reflections)
Data Source
AI summary
A spectacle lens for a display device which can be placed on the head of a user and generate an image has a front and a rear, an injection section and a deflection section spaced from the injection section, an exit section in the rear and a light-guiding channel which guides light beams of pixels of the generated image, which are injected into the spectacle lens via the injection section, in the spectacle lens to the deflection section, by which they are deflected towards the exit section and then coupled out of the spectacle lens through the exit section. The spectacle lens is in the form of a progressive lens having a distance vision region and a near vision region, and the exit section, as viewed from above onto the rear of the spectacle lens, lies outside the distance vision region and outside the near vision region.