Ocular Optical System Compact Design Aberration Control
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Solution Overview
Problem
Conventional ocular optical systems have limitations such as a small angle of view and significant astigmatism and distortion aberrations, making it challenging to maintain image quality while reducing the size of imaging lenses.
Innovation Solution
The ocular optical system is designed with specific configurations of lens elements, including convex and concave surfaces, and controlled parameters like central thickness and air gaps to enhance the angle of view and maintain optical characteristics, allowing for a shorter system length while improving image quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the size of imaging lens is reduced, then the device becomes more compact, but the angle of view becomes smaller and optical aberrations increase
Solution Approach 1:
The imaging lens is divided into four separate lens elements (first, second, third, and fourth lens elements) with different optical functions. Each element contributes to correcting specific aberrations and enabling a wider angle of view, allowing the overall system to be compact while maintaining optical performance.
Solution Approach 2:
Each lens element has specifically designed surface configurations (convex or concave portions at specific locations) to address local optical issues. For example, the second lens element has a convex portion at its display-side surface, while the third and fourth elements have concave portions, creating localized optical corrections throughout the system.
2Volume of moving object
If the size of imaging lens is reduced, then the device becomes more compact, but astigmatism and distortion aberrations become larger
Solution Approach 1:
The lens system is segmented into four elements, each responsible for correcting specific types of aberrations. This distribution of optical functions allows effective control of astigmatism and distortion even in a compact form factor.
Solution Approach 2:
The patent specifies precise parameter ranges for lens element properties including refractive indices (n1, n2, n3, n4), Abbe numbers (v1, v2, v3, v4), thickness ratios (T1/T4, T2/T4, T3/T4), and air gap ratios (G12/G34, G23/G34). These controlled parameter changes enable aberration correction while maintaining compact dimensions.
3Length of moving object
If the length of ocular optical system is shortened, then the device becomes more compact, but maintaining good optical characteristics becomes difficult
Solution Approach 1:
The optical system is divided into four lens elements with specific functional assignments, allowing the total length to be reduced while each element maintains its optical effectiveness through optimized surface configurations and positioning.
Solution Approach 2:
The patent establishes specific parameter ranges including TTL/ER ≤ 10, EFL/G4D ≥ 2.4, and thickness ratios that ensure optimal optical performance in a shortened configuration. These parameter controls maintain image quality despite the reduced overall length.
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 improves the angle of view and reduces optical aberrations, achieving better image quality and a more compact design by optimizing the thickness and air gaps between lens elements.
Implementation Method 1
an ocular optical system may comprise, sequentially from an eye-side to a display-side along an optical axis, first, second, third, and fourth lens elements
Data Source
AI summary
Present embodiments provide for an ocular optical system. The ocular optical system includes a first lens element, a second lens element, a third lens element, a fourth lens element, a fifth lens element and a sixth lens element positioned in an order from an eye-side to an display-side. Through designing parameters satisfying at least two inequalities and convex and/or concave surface of lens elements, the improved ocular optical system may provide better optical characteristics, a decreased effective focal length and an enlarged angle of view while the total length of the ocular optical system may be shortened.