Optical Guide Injection Section Volume Reduction
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Solution Overview
Problem
Optical guides used in ocular vision systems face challenges in minimizing the complexity and size of the injection section while preventing 'holes' and ensuring total internal reflection, which affects the accurate transport of images without deformation.
Innovation Solution
The optical guide design features a material with two parallel faces, an injection section with a transmissive or reflective active face, and an extraction section with mirrors forming specific angles to minimize the injection section volume and eliminate 'holes, ensuring total internal reflection and precise image transport.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the injection section is made larger to prevent holes and ensure total internal reflection, then image transport reliability is improved, but device size and complexity increase
Solution Approach 1:
The patent applies parameter changes by precisely optimizing the angle of the active face (set to 2μ where μ is the extraction mirror angle) and the position of its extreme points. This angular parameter optimization ensures that light rays undergo total internal reflection at the correct angles while minimizing the injection section volume, preventing holes without requiring excessive size
Solution Approach 2:
The patent resolves the contradiction by transitioning from a conventional rectangular injection section to a geometrically optimized shape where the active face is inclined at a specific angle. This dimensional reconfiguration allows the light propagation path to be optimized in three-dimensional space, achieving reliable total internal reflection while minimizing the overall volume of the injection section
2Device complexity
If the active face angle is optimized to minimize injection section volume, then device complexity is reduced, but image quality and deformation-free transport may deteriorate
Solution Approach 1:
The patent achieves this balance by establishing a specific mathematical relationship for the active face angle (2μ) and positioning the extreme points according to precise geometric criteria. This parameter optimization ensures that the simplified injection section geometry still maintains the exact angular conditions needed for total internal reflection, thereby preserving image quality and preventing deformation while reducing complexity
Solution Approach 2:
The patent applies preliminary action by pre-calculating and pre-positioning the active face at the optimal angle and extreme points during the design phase. This preliminary geometric configuration ensures that when light enters the injection section, it automatically follows the correct reflection paths without requiring complex real-time adjustments, thus maintaining manufacturing precision while simplifying the overall device structure
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 design minimizes the volume of the injection section, eliminates 'holes', and maintains image quality by optimizing the angles and geometry of the injection and extraction sections, allowing for efficient and deformation-free image transport.
Implementation Method 1
The beam propagates inside the guide by total internal reflection or thanks to a specific treatment of the walls
Implementation Method 2
an extraction section allowing the exit of the beam based on extraction mirrors making an angle μ with the faces of the guide
Data Source
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AI summary
The present invention relates to the field of optical guides and more particularly guides allowing the distortion-free transport of an image. These guides may in particular be used for the fabrication of optical systems for ocular vision more commonly referred to as smart glasses. There are proposed optical guides whose injection cross section is calculated so as not to create holes between the rebounds of the image in the guide, these cross sections being simple and of reduced proportions.