Eyeball Tracking Optics With Reflection Prism for Complete Eye Imaging
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Solution Overview
Problem
Existing eyeball tracking systems in VR helmets face limitations due to the camera's position and angle, leading to low utilization of the light-sensitive surface and incomplete imaging of eye images, which is exacerbated by the compact design requirements of thin-thickness and foldable VR helmets.
Innovation Solution
Incorporating at least one reflection prism at the front end of the camera's light-sensitive surface to adjust the position and angle of the image acquisition module, prolong the light path, and reduce the system size, thereby improving the utilization rate of the light-sensitive surface and enhancing image quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the camera is located between the optical lens and the reflector in a compact design, then the system size is reduced, but the light-sensitive surface utilization rate decreases and imaging becomes incomplete
Solution Approach 1:
A reflection prism is introduced as an intermediary optical element between the reflector and the camera. The prism redirects reflected light rays that would otherwise miss the camera sensor, ensuring complete eye image capture while maintaining the compact arrangement where the camera is positioned between the optical lens and reflector.
Solution Approach 2:
The reflection prism changes the optical path by introducing a new spatial dimension for light ray redirection. By angling the prism at specific orientations, it redirects light rays in previously unused directions to hit the camera's light-sensitive surface, improving utilization without increasing the overall system volume.
2Volume of moving object
If the camera position and angle are limited in a compact design, then the system size is reduced, but the light-sensitive surface utilization rate decreases
Solution Approach 1:
The reflection prism serves as a light-guiding intermediary that captures reflected light rays and redirects them toward the camera sensor. This ensures that even in a compact configuration with limited camera positioning freedom, the light-sensitive surface receives sufficient light energy for complete and high-quality eye image capture.
Solution Approach 2:
The prism changes the angular parameters of the light rays by reflecting them at specific angles. This parameter transformation allows the camera to receive light from directions that would otherwise be blocked, maximizing the utilization of the light-sensitive surface area within the constrained compact design.
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 allows for a larger eye imaging area, complete acquisition of eye images, and improved imaging quality by effectively utilizing the light-sensitive surface, while accommodating the compact design needs of VR helmets.
Implementation Method 1
adding at least one reflection prism at a front end of a light-sensitive surface of a camera can achieve the effects of reducing the system size, prolonging the light path
Implementation Method 2
reflected light rays S0′ transmit through an optical lens 14
Data Source
AI summary
An eyeball tracking optical system and a head-mounted device. The eyeball tracking optical system includes a light source module, a fixed-lens group module, a prism module, and an image acquisition module. In an optical path formed by photographing an eye image, at least one reflection prism is added at a front end of a light-sensitive surface of the image acquisition module.