Self-Monitoring Binocular Calibration Target for AR/VR
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Solution Overview
Problem
Existing calibration systems for AR/VR glasses face challenges in providing precise, adjustable parallel light beams to accommodate varying interpupillary distances, often requiring large and costly collimators that are impractical for compact setups, and are susceptible to imperfections during fabrication and use.
Innovation Solution
A system utilizing multiple beam splitters and a movable structure to produce and adjust parallel light beams, with cameras and control devices for self-monitoring and correction, allowing for precise alignment and calibration of light paths at exit pupils across a wide range of interpupillary distances.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a large collimator is used to provide large-aperture beams and wide object distances, then the calibration system can accommodate varying interpupillary distances, but the system becomes large, costly, and requires more space
Solution Approach 1:
The patent divides the calibration system into multiple segments: a light source, multiple beam splitters (first, second, third, and fourth beam splitters), and a movable structure. Each component performs a specific function in generating and directing light beams, replacing the need for a single large collimator. The beam splitters are arranged to create multiple light beams with adjustable spacing, enabling adaptation to different interpupillary distances while keeping each component compact.
Solution Approach 2:
The patent implements a movable structure that can adjust the position of the second and fourth beam splitters relative to the first and third beam splitters. This dynamic adjustment capability allows the spacing between light beams to be varied, accommodating different interpupillary distances (60mm-220mm range). The movable structure enables the system to adapt its configuration without requiring a large fixed setup.
2Measurement precision
If a large collimator is used to ensure precise parallel light beams, then calibration accuracy is improved, but the system becomes costly and complex
Solution Approach 1:
The patent incorporates a camera to capture images of the light beams and a control device that processes these images to determine whether the beams are parallel. The control device provides feedback by indicating whether adjustment is needed, enabling precise control of beam parallelism without requiring a large, expensive collimator. This feedback mechanism allows for accurate calibration while maintaining system compactness.
Solution Approach 2:
The system performs self-monitoring through the camera and control device, which automatically detect beam parallelism and indicate when adjustment is required. This self-service capability eliminates the need for complex manual alignment procedures and expensive precision components, as the system can self-correct and maintain accuracy through automated monitoring.
3Ease of operation
If the calibration system is made compact to reduce space requirements, then ease of operation is improved, but the ability to provide wide object distances is reduced
Solution Approach 1:
The movable structure enables dynamic adjustment of beam spacing within a compact form factor. By allowing the second and fourth beam splitters to move relative to the fixed first and third beam splitters, the system can generate light beams at various separations (60mm-220mm) without requiring a large physical footprint. This dynamic configuration allows a compact system to provide the wide object distance range needed for different interpupillary measurements.
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 efficient and precise calibration of light paths in AR/VR glasses without the need for large collimators, ensuring parallel light beams are consistently supplied, reducing costs and setup complexity while maintaining high calibration accuracy.
Implementation Method 1
a first beam splitter configured for reflecting a light beam from a light source to create a first light beam; a second beam splitter configured for reflecting a transmitted light beam from the light beam from the light source to create a second light beam
Data Source
AI summary
A system for providing two spaced-apart parallel light beams wherein the space between the two spaced-apart parallel light beams is adjustable, the system including: a first beam splitter configured for reflecting a light beam from a light source to create a first light beam; a second beam splitter configured for reflecting a transmitted light beam from the light beam from the light source to create a second light beam; a third beam splitter configured for transmitting the first light beam and reflecting the first light beam to create a third light beam, the first beam splitter and the third beam splitter are disposed along a first central axis; a fourth beam splitter configured for transmitting the second light beam and reflecting the second light beam to create a fourth light beam.