Eyeball Detection Using Virtual Light Sources for Corneal Reflection Separation
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Solution Overview
Problem
Conventional eyeball information detection apparatuses face challenges in improving detection accuracy, particularly in distinguishing corneal reflection light rays and maintaining a clear field-of-view.
Innovation Solution
The apparatus includes a support member with a substrate facing the eyeball, an irradiation system with non-visible light sources, optical elements that generate virtual light sources, a light reception system, and a detection system to enhance detection accuracy by separating corneal reflection images effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional eyeball information detection apparatus uses simple light sources and receivers, then device complexity is reduced, but detection accuracy deteriorates due to inability to effectively separate corneal reflection images
Solution Approach 1:
The invention divides the light source into multiple separate light sources positioned at different locations. Each light source illuminates the eyeball from a different angle, creating distinct corneal reflection images that can be separately identified and analyzed by the imaging device, thereby improving detection accuracy through segmented illumination
Solution Approach 2:
The invention introduces optical elements (such as lenses or mirrors) as intermediaries between the light sources and the eyeball. These optical elements manipulate the light paths to ensure that corneal reflection images from different light sources are properly separated and directed to the imaging device, enhancing detection capability without requiring direct complex positioning of all components
2Ease of operation
If the apparatus is designed with compact structure and short eye relief, then ease of operation and user comfort are improved, but detection accuracy deteriorates due to difficulty in separating corneal reflection images
Solution Approach 1:
The invention resolves the spatial constraint of compact design by utilizing angular separation in addition to spatial separation. Multiple light sources are positioned at different angles relative to the optical axis, allowing corneal reflection images to be separated in the angular domain. This enables effective detection accuracy even with short eye relief distance, as the angular distribution of reflected light provides sufficient separation without requiring large physical distances
3Measurement precision
If multiple light sources are used to improve detection accuracy, then measurement precision is improved, but device complexity and manufacturing difficulty increase
Solution Approach 1:
The invention combines multiple light sources and their associated optical elements into an integrated optical assembly that functions as a unified unit. This merging approach allows the multiple illumination paths to be manufactured and aligned together as a single component system, reducing the cumulative manufacturing complexity that would arise from assembling separate independent systems for each light source
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 improves the detection accuracy of eyeball information by effectively separating corneal reflection images, even in compact designs with short eye relief, while maintaining a clear field-of-view.
Implementation Method 1
at least one optical element that is provided to the substrate so that the at least one optical element is irradiated with the non-visible light, generates a virtual light source of the non-visible light
Data Source
AI summary
To provide an eyeball information detection apparatus capable of improving the detection accuracy. The present technology provides an eyeball information detection apparatus including: a support member that is mounted on a head of a user; a substrate provided to the support member so as to face an eyeball of the user; an irradiation system that is provided to the support member and includes at least one light source that emits non-visible light towards the substrate; at least one optical element that is provided to the substrate so that the at least one optical element is irradiated with the non-visible light and generates a virtual light source of the non-visible light; a light reception system that receives the non-visible light reflected on the eyeball via the optical element; and a detection system that detects information about the eyeball on the basis of an output from the light reception system.