Three-Lens Optical Imaging System for Compact AR Eyeball Tracking
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Solution Overview
Problem
Existing optical imaging systems for augmented reality (AR) and virtual reality (VR) devices struggle to capture rapid and accurate movements of a user's eyeball without increasing the device's weight and size.
Innovation Solution
The optical imaging system consists of a configuration of lenses, including a first lens, a second lens with negative refractive power, and a third lens, optimized to achieve specific focal length and distance ratios, ensuring miniaturization and high-resolution image capture.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of stationary object
If the optical imaging system uses a compact lens configuration, then the device size and weight are reduced, but the image capture accuracy and resolution may deteriorate
Solution Approach 1:
The patent applies parameter changes by optimizing the refractive powers, focal lengths, and spacing of the three lenses to achieve a compact configuration that maintains high measurement precision. The specific conditional expressions (e.g., 0.3 < f1/|f2| < 1.5, −5.0 < f2/f3 < −2.0) define precise parameter ranges that balance miniaturization with accurate eyeball movement capture
Solution Approach 2:
The optical imaging system uses a composite lens structure with three different lenses having specific refractive power relationships. This composite configuration allows the system to achieve both compact size and high precision by combining the optical properties of multiple lenses with carefully controlled focal length ratios
2Length of stationary object
If the optical imaging system uses a compact lens configuration, then the device size is reduced, but the image resolution may deteriorate
Solution Approach 1:
The patent optimizes critical parameters including focal lengths (f1, f2, f3), lens spacing (d12, d23), and refractive powers to achieve compact size while maintaining high resolution. The conditional expressions establish precise parameter relationships that enable miniaturization without sacrificing image quality
Solution Approach 2:
The optical imaging system is designed with dynamic adjustment capabilities, allowing the lens positions and spacing to be optimized for different imaging scenarios. This enables the compact system to maintain high resolution across various eyeball movement conditions
3Speed
If the optical imaging system captures rapid eyeball movements, then the imaging speed is improved, but the device complexity may increase
Solution Approach 1:
The patent divides the optical system into three distinct lenses with specific functional roles, where each lens contributes to different aspects of the imaging performance. This segmentation allows the system to achieve high imaging speed for rapid eyeball movements while keeping each individual lens relatively simple
Solution Approach 2:
The three-lens optical configuration serves multiple functions simultaneously: it achieves compact size, captures rapid movements, and maintains high resolution. The universal design allows a single optical system to handle various imaging requirements without adding significant complexity
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 efficient and accurate capture of eyeball movements within a compact and lightweight device, enhancing the performance of AR and VR applications.
Implementation Method 1
a first lens, a second lens having negative refractive power, and a third lens disposed in order from an object side
Data Source
AI summary
An optical imaging system includes a first lens, a second lens, and a third lens disposed in order from an object side. The optical imaging system satisfies 1.2 mm<TTL<2.0 mm and 0<f3/f<1.0, where TTL is a distance from an object-side surface of the first lens to an imaging plane, f is a focal length of the optical imaging system, and f3 is a focal length of the third lens.