VR Eye-Tracking Optics With Reflection Layers for Complete Imaging
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Solution Overview
Problem
Existing eyeball tracking devices in virtual reality glasses suffer from total reflection of reflection light rays on the ocular lens or added lenses, leading to incomplete image collection and enlarged device size.
Innovation Solution
The device employs a lens assembly with a first and second lens portion forming a bonding lens, a reflection assembly to reflect light rays at least once, and an image collection assembly to track the eyeball, using a first reflection layer on the bonding face and optional additional reflection layers to redirect light rays for imaging without enlarging the device.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a lens is added to the device to collect reflection light rays, then the image collection capability is improved, but the integral size of the device is enlarged
Solution Approach 1:
The patent combines the reflection light ray collection function with the existing ocular lens by adding a reflection layer to its surface. This merging approach allows the ocular lens to simultaneously serve as both the display element and the reflection light ray collector, eliminating the need for separate collection lenses and thereby maintaining a compact device size while improving image collection capability.
Solution Approach 2:
The ocular lens is designed to perform multiple functions: displaying virtual reality content and collecting reflection light rays from the eyeball. By making the ocular lens universal, the patent avoids adding dedicated collection lenses, thus preventing device enlargement while enhancing the image collection function.
2Device complexity
If the ocular lens surface is used for reflection, then the device structure is simplified, but total reflection occurs and prevents light ray collection
Solution Approach 1:
The patent applies a reflection layer selectively on specific regions of the ocular lens surface. This local quality modification ensures that only the necessary portions of the lens surface reflect light rays while maintaining the overall optical properties of the lens, thereby preventing total reflection and enabling effective light ray collection without compromising device structure simplicity.
Solution Approach 2:
The reflection layer acts as an intermediary between the ocular lens surface and the incoming light rays. It mediates the interaction by providing controlled reflection properties, preventing total reflection while maintaining the simplified device structure. The reflection layer enables reliable light ray collection without requiring structural complexity.
3Measurement precision
If additional lenses are added to prevent total reflection, then light ray collection is improved, but the device size is enlarged
Solution Approach 1:
Instead of adding separate lenses to prevent total reflection, the patent merges the reflection function into the existing ocular lens by applying a reflection layer. This approach improves light ray collection while avoiding device size enlargement, as the ocular lens itself is utilized for both display and light collection functions.
Solution Approach 2:
The ocular lens serves itself by incorporating a reflection layer that enables it to collect reflection light rays from the eyeball. This self-service approach eliminates the need for additional dedicated components, thereby improving light ray collection without increasing device size.
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
The solution effectively prevents total reflection of light rays, allowing complete image collection and maintaining a compact device size by optimizing the light path without adding new lenses, thus enhancing tracking accuracy and reducing device bulk.
Implementation Method 1
the first reflection layer is disposed to reflect a reflection light ray of the first light ray to form a first reflection light ray
Implementation Method 2
the reflection assembly is disposed to reflect the first reflection light ray at least once to form a light ray to be imaged
Data Source
AI summary
An eyeball tracking optical device and system, and a virtual reality device is provided. In the device, a lens assembly includes a first and second lens portion sequentially disposed away from the eyeball forming a lens. A side face of the first lens portion has a concave face. A side face of the second lens portion has a convex face. Both attach to form a bonding face that is provided with a first reflection layer. A reflection assembly is located close to an image collection assembly. A light source assembly emits a first light ray to the eyeball. The first reflection layer reflects a reflection light ray to form a first reflection light ray. The reflection assembly is disposed to reflect the first reflection light ray at least once to form a light ray to be imaged and collected by the image collection assembly to track the eyeball.