Eyeball-tilt detection without MEMS mirrors
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Solution Overview
Problem
Existing eyeball-tilt position detecting devices, such as those used in eyeglass-type image display apparatuses for AR and VR, face challenges in accurately detecting eyeball tilt due to vibrations and external impacts, particularly when using movable structures like MEMS mirrors.
Innovation Solution
A device comprising a light source array with multiple light emitting sections, an optical spot position detection element, and processing circuitry that calculates the eyeball tilt position based on detection signals, without relying on movable parts, using a light deflector like a lens or plane mirror to adjust the light's incident angle on the eyeball.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a movable structure such as a MEMS mirror is used to scan lasers on the eyeball, then the ability to track eye movements is improved, but the detection precision of eyeball tilt position is degraded due to vibration and external impact
Solution Approach 1:
The patent removes the movable MEMS mirror structure from the system and replaces it with a stationary light source array. This extraction of the problematic movable component eliminates vibration and external impact influences while preserving the core function of scanning lasers across the eyeball through electronic control of the light source array positions.
Solution Approach 2:
The patent replaces the mechanical MEMS mirror scanning system with an electronic light source array positioning system. Instead of physically moving mirrors to scan laser beams, the system uses multiple stationary light emitting sections that can be electronically controlled to illuminate different areas of the eyeball, substituting mechanical movement with electronic control.
2Volume of moving object
If the size of cornea or pupil is restricted, then the device can be made compact, but vignetting of laser occurs in peripheral portion of cornea or pupil
Solution Approach 1:
The patent divides the single laser beam into multiple discrete light emitting sections arranged in an array. Each light emitting section can independently illuminate a specific region of the cornea or pupil, allowing the system to cover the entire eye surface including peripheral areas without requiring a single large laser beam, thus maintaining compact device size while ensuring complete coverage.
Solution Approach 2:
The patent transitions from a single-point light source to a multi-point light source array, adding spatial dimensionality to the illumination system. By arranging multiple light emitting sections in two-dimensional space, the system can illuminate the entire corneal or pupillary surface without increasing the physical size of individual components, effectively solving the vignetting problem while maintaining compactness.
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 solution enhances detection accuracy and resistance to vibrations and external impacts, improving the precision and reliability of eyeball tilt position detection, while reducing the need for complex adjustments and costly components.
Implementation Method 1
an optical spot position detection element configured to detect an optical spot position of light reflected from an eyeball
Data Source
AI summary
An eyeball-tilt detecting device for detecting a tilt position of an eyeball, including: a light source array including a plurality of light emitting sections that emit light having directivity; an optical spot position detection element configured to detect an optical spot position of light reflected from an eyeball to output a detection signal; and processing circuitry configured to calculate a tilt position of the eyeball based on the detection signal output from the optical spot position detection element.