Wavelength-Specific Eye Information Detection With Diffractive Optics
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Solution Overview
Problem
Existing eye information detection techniques, such as those disclosed in PTL 1, lack the capability for highly accurate detection of eye information.
Innovation Solution
An eye information detection device utilizing two or more non-visible light sources with different wavelengths, a diffractive optical element, and a light reception system that includes multiple light reception elements, where the diffractive optical element diffracts non-visible light reflected by the eye to be received by the appropriate light reception elements, allowing for high-accuracy detection of eye information.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a single light source and simple optical system are used, then device complexity is reduced, but measurement precision of eye information deteriorates
Solution Approach 1:
The optical system is segmented into multiple functional components: multiple light sources emitting different wavelengths, a diffractive optical element with multiple diffraction portions, and multiple light reception elements. Each component handles specific wavelengths or detection tasks, enabling high-precision eye information detection through specialized segmentation of the optical path.
2Measurement precision
If multiple light reception elements are used to detect different wavelengths, then measurement precision improves, but device complexity increases
Solution Approach 1:
The diffractive optical element serves as an intermediary that separates incoming light by wavelength and directs each wavelength to its corresponding light reception element. This mediator component enables wavelength-specific detection without requiring complex routing mechanisms, as the diffraction pattern naturally directs different wavelengths to different reception elements.
3Length of stationary object
If the light reception system is disposed on the eye side of the diffractive optical element, then the optical path is shortened, but crosstalk between different wavelengths may increase
Solution Approach 1:
The diffractive optical element is designed with local quality variations through its diffraction pattern, creating wavelength-specific reception zones on the eye side. Each light reception element is positioned in a specific local region that corresponds to a particular wavelength, enabling wavelength discrimination even in a compact configuration with minimized optical path length.
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
Enables accurate detection of eye information, including orientation and pupil size, with reduced thickness and crosstalk, and without affecting the user's vision, by using infrared light and a diffractive optical element to separate and direct non-visible light to specific light reception elements.
Implementation Method 1
a diffractive optical element disposed on an optical path of non-visible light emitted from each of the two or more non-visible light sources and reflected by an eye
Data Source
AI summary
The present technology provides an eye information detection device including two or more non-visible light sources, a diffractive optical element, and a light reception system. The two or more non-visible light sources have different light emission wavelengths. The diffractive optical element is disposed on an optical path of non-visible light emitted from each of the two or more non-visible light sources and reflected by an eye. The light reception system receives the non-visible light reflected by the eye and passing through the diffractive optical element. According to the present technology, it is possible to make improvement regarding the highly accurate detection of the information of the eye.