Ocular Optical System with Positive-Negative Lens Configuration
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Solution Overview
Problem
The short eye relief of existing ocular optical systems poses challenges in near-eye display applications such as VR and AR, leading to poor telecentricity and compromised imaging quality.
Innovation Solution
An ocular optical system with a configuration of a first lens having positive refractive power, a second lens with positive refractive power, and a third lens with negative refractive power, along with specific optical axis and lens thickness relationships, to achieve long eye relief and favorable telecentricity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the eye relief is extended for near-eye display applications, then the adaptability to AR/VR scenarios is improved, but the telecentricity deteriorates
Solution Approach 1:
The patent changes the refractive power parameters of the lenses and the spacing between them. Specifically, it uses a first lens with positive refractive power, a second lens with positive refractive power, and a third lens with negative refractive power, with specific spacing relationships (0.3 < d1/f1 < 0.6 and 0.4 < d2/f2 < 0.7) to achieve both long eye relief and good telecentricity
Solution Approach 2:
The patent combines multiple lens elements with different refractive properties (positive and negative refractive power lenses) to create a composite optical system. This composite structure allows the system to achieve conflicting performance requirements simultaneously by leveraging the complementary characteristics of different lens components
2Ease of operation
If the eye relief is extended, then the ease of operation is improved, but the imaging quality deteriorates
Solution Approach 1:
The patent optimizes specific parameter ranges including the spacing between lenses relative to focal lengths (0.3 < d1/f1 < 0.6, 0.4 < d2/f2 < 0.7), the ratio of focal lengths (0.2 < f1/f2 < 1.5), and the Abbe number relationship (30 < V1 - V2 < 80). These parameter optimizations ensure both long eye relief and high imaging quality
Solution Approach 2:
The patent assigns different local properties to different lens elements: the first and second lenses have positive refractive power for convergence, while the third lens has negative refractive power for divergence. Each lens is positioned at specific distances from the previous element, creating local optimizations that collectively achieve both ease of operation and high imaging quality
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 system delivers improved optical imaging quality and telecentricity, enabling effective imaging for near-eye displays with extended eye relief, while maintaining a compact design suitable for augmented reality applications.
Implementation Method 1
The first lens has positive refractive power, the second lens has positive refractive power, the third lens has negative refractive power
Data Source
AI summary
An ocular optical system configured to allow imaging rays from a display image to enter an observer's eye through the ocular optical system so as to form an image is provided. A direction toward the eye is an eye side, and a direction toward the display image is a display side. The ocular optical system includes a first lens element, a second lens element, and a third lens element arranged along an optical axis in sequence from the eye side to the display side. Each of the first to third lens elements has an eye-side surface and a display-side surface. The ocular optical system satisfies: 0<f/f1+f/f2+f/f3<0.35, where f is an effective focal length of the ocular optical system, f1 is a focal length of the first lens element, f2 is a focal length of the second lens element, and f3 is a focal length of the third lens element.