Cemented Eye-Tracking Optics to Prevent Total Reflection in VR
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Solution Overview
Problem
Existing eyeball tracking devices in virtual reality glasses and augmented reality glasses suffer from total reflection of reflected light rays, leading to ineffective tracking due to increased device volume and limited scenarios, especially when additional lenses are added.
Innovation Solution
The device employs a cemented lens assembly with a concave and convex surface combination, a reflective layer, and a light source to reflect light rays for imaging without additional lenses, using a light ray direction adjustment assembly to ensure proper collection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If additional lenses are added to the image collection portion, then the device volume increases, but the reflected light ray is prone to total reflection on the lens surface, causing ineffective tracking
Solution Approach 1:
The patent extracts the reflective function from a separate additional lens and integrates it into the cemented surface of the existing lens assembly. By taking out the need for an extra lens and placing the reflection function on the cemented surface, the device avoids the total reflection problem while maintaining compact volume.
Solution Approach 2:
The cemented surface of the lens assembly is given dual functionality: it serves both as the optical interface for light transmission and as the reflective surface for directing light rays. This multi-functionality eliminates the need for separate components, reducing device volume while maintaining tracking reliability.
2Reliability
If additional lenses are added to the image collection portion, then the device volume increases, but the reflected light ray cannot be collected effectively
Solution Approach 1:
The patent merges the reflective function with the lens assembly by coating the cemented surface with a reflective layer. This combination integrates multiple functions (light transmission and reflection) into a single component, reducing optical assembly complexity while ensuring effective image collection.
Solution Approach 2:
The lens assembly's cemented surface performs both optical focusing and light reflection functions simultaneously. This multi-functionality simplifies the overall optical assembly by eliminating the need for separate reflective components, thereby reducing device complexity while maintaining collection effectiveness.
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 configuration allows for effective eyeball tracking without increasing device volume, reducing total reflection, and enhancing tracking sensitivity and clarity by optimizing the optical path.
Implementation Method 1
the first reflective layer is configured to reflect reflected light ray of the first light ray so as to form light ray to be imaged
Implementation Method 2
the lens assembly includes at least one cemented lens, the cemented lens includes a first lens portion and a second lens portion, a side surface, away from an eyeball, of the first lens portion is provided with a concave surface, a side surface, close to the eyeball, of the second lens portion is provided with a convex surface
Data Source
AI summary
An eyeball tracking optical device and system, and a virtual reality apparatus. A lens assembly in the device includes at least one cemented lens, which includes a first lens portion and a second lens portion, wherein a side surface, away from an eyeball, of the first lens portion is provided with a concave surface, a side surface, close to the eyeball, of the second lens portion is provided with a convex surface, the concave surface is attached to the convex surface to form a cemented surface, the cemented surface is provided with a first reflective layer, and the portion, close to an image collection assembly, of the cemented lens is provided with a first plane having an included angle with a focal plane of the cemented lens; and a light source assembly is configured to emit first light ray to the eyeball.