Eyeball Tracking Optics Using Reflection Prism for Complete Eye Coverage
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Solution Overview
Problem
Existing VR helmets face issues with incomplete imaging due to blocked areas of the eye caused by large shooting angles of cameras located outside the optical lens, leading to inefficient utilization of the light-sensitive face and reduced imaging quality.
Innovation Solution
Incorporating at least one reflection prism at the front end of the image collection module's light-sensitive face to extend the light path and reduce the shooting angle, allowing for expanded eye coverage and improved imaging quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the camera is located outside all lenses of the near-eye eyeball tracking device to avoid obstructing the field of view, then the field of view is not obstructed, but the shooting angle becomes very large causing part of the eye area to be blocked and cannot be collected
Solution Approach 1:
A reflection prism is introduced as an intermediary optical element between the camera and the eye. The prism reflects the light path at a specific angle, allowing the camera to capture the eye area that would otherwise be blocked by the device structure, thus solving the contradiction between avoiding obstruction and maintaining complete eye coverage
Solution Approach 2:
The reflection prism changes the light path from a direct linear path to a reflected path at a different angle. This dimensional change in light propagation allows the camera to capture eye areas from a different spatial perspective, expanding the effective shooting area without increasing the device's physical footprint
2Volume of moving object
If the camera is disposed at the edge of the optical lens close to the eyeball, then the device size is reduced, but the shooting angle becomes very large causing incomplete eye imaging
Solution Approach 1:
The reflection prism serves as a mediator that enables the camera to be positioned close to the eye while still achieving complete eye coverage. The prism redirects the light path to compensate for the limited field of view, allowing compact device placement without sacrificing imaging completeness
Solution Approach 2:
By introducing the reflection prism, the light path is redirected into a different spatial dimension, allowing the camera to capture a broader eye area from a compact position. This dimensional transformation of the light path enables both small device size and complete eye imaging
3Measurement precision
If the camera is positioned to capture the entire eye area, then the shooting area is expanded, but the light-sensitive face utilization rate decreases due to the large shooting angle
Solution Approach 1:
The reflection prism transforms the light path into a different spatial dimension, allowing the camera to capture the entire eye area while directing light onto a more optimal portion of the light-sensitive face. This dimensional redirection optimizes the utilization of the camera's light-sensitive area
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 utilizes the light-sensitive face, expands the shooting area, and enhances imaging quality by addressing the issue of incomplete imaging, while also reducing the system size.
Implementation Method 1
by adding at least one reflection prism at the front end of a light-sensitive face of the image collection module... after being reflected by the fixed lens group module, the reflection light ray enters the image collection module after being reflected by the at least one reflection prism
Data Source
AI summary
Provided is an eyeball tracking optical system and a head-mounted device. The system includes a light source module, a fixed lens group module, a prism module and an image collection module. In a light path for shooting an image of eyes by external reflection of the image collection module, adding at least one reflection prism at the front end of a light-sensitive face of the image collection module.