AR Lens Reflective Members Field of View
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current augmented reality (AR) devices have limited field of view (FOV), making it difficult for users to simultaneously perceive both real and virtual images effectively, as existing technologies struggle to widen the display area visible to the user without compromising image quality or requiring significant adjustments in focus.
Innovation Solution
The proposed solution involves an AR providing apparatus with a lens system comprising multiple reflective members arranged at different angles, which are integrated into the lens structure to reflect virtual images displayed by a micro-display, allowing these images to be focused on the user's retina without shifting focus from real images, thereby widening the field of view.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If a single lens is used to display virtual images, then the device structure remains simple, but the field of view is limited and users cannot simultaneously perceive real and virtual images effectively
Solution Approach 1:
The single lens is divided into multiple lens portions (first lens portion, second lens portion, third lens portion) arranged in sequence along the thickness direction. Each lens portion contains a reflective member that reflects light at a different angle, enabling the system to widen the field of view by directing light from different regions of the display device to different angular positions, allowing users to perceive both real and virtual images simultaneously without requiring a completely complex device restructuring.
2Area of stationary object
If multiple reflective members are added to widen the field of view, then the display area visible to the user increases, but the manufacturing precision requirements increase
Solution Approach 1:
The reflective members are embedded within grooves formed in each lens portion, creating a nested structure where the reflective member is housed within the lens material. This nesting approach provides mechanical support and positioning for the reflective members, reducing the need for high-precision external mounting structures. The grooves are formed with controlled dimensions (diameter 400 μm to 2 mm, depth 10 μm to 500 μm) and surface roughness (20 nm to 40 nm), which facilitates precise positioning while simplifying the overall manufacturing process compared to requiring ultra-precise alignment of separate components.
3Reliability
If reflective members are formed with grooves to improve image focus, then the depth of field increases, but residual stress in the lens increases
Solution Approach 1:
The groove parameters are optimized to balance image focus quality and residual stress. The groove diameter is controlled within 400 μm to 2 mm, depth within 10 μm to 500 μm, and surface roughness within 20 nm to 40 nm. These parameter ranges are specifically selected to provide sufficient light reflection and focusing capability while minimizing the stress concentration that would occur with deeper or narrower grooves. The residual stress at the inflection point is controlled to remain within 4 MPa to 6 MPa, ensuring the lens maintains its optical properties without excessive stress.
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 the depth of field for virtual images, allowing users to see virtual and real images as a single image without the need to adjust focus, effectively increasing the field of view and improving the overall AR experience.
Implementation Method 1
the first reflective member reflects the first image at a first angle, and the second reflective member reflects the second image at a second angle that is different from the first angle
Data Source
AI summary
An augmented reality providing apparatus is provided. The augmented reality providing apparatus includes a lens including a first lens portion including a first reflective member, and a second lens portion including a second reflective member, and a display device on one side of the lens for displaying first and second images, wherein the first reflective member reflects the first image at a first angle, and the second reflective member reflects the second image at a second angle that is different from the first angle.