Four-Lens Ocular Optical System for VR with Abbe Number Control
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Solution Overview
Problem
Existing ocular optical systems for virtual reality devices have a small viewing angle, low resolution, and significant chromatic aberration and distortion, limiting the visual experience.
Innovation Solution
A four-lens ocular optical system with specific refractive power distribution and surface shapes, including convex and concave portions on lens elements, optimized for reduced total length while maintaining good optical performance and larger viewing angles, adhering to specific ratios for lens thickness, air gaps, and Abbe number differences.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If the ocular optical system uses conventional lens design, then the total length can be reduced, but the viewing angle becomes small and optical image quality deteriorates
Solution Approach 1:
The optical system is divided into four distinct lens elements with specific refractive power distributions. Each lens element has specialized surface shapes (convex portions at periphery of first and third lens elements) that work together to achieve both compact length and wide viewing angle. This segmentation allows optimization of each element's function while maintaining overall system compactness.
Solution Approach 2:
The first and third lens elements have convex portions specifically located at their periphery, creating local variations in refractive properties. This local quality enhancement at critical locations allows the system to expand the viewing angle without increasing overall length, as the peripheral convex portions specifically address marginal ray control.
2Length of moving object
If the ocular optical system uses conventional lens design, then the total length can be reduced, but the chromatic aberration and distortion increase
Solution Approach 1:
The system employs specific parameter relationships including Abbe number differences (|υ1-υ4|≥20.00) between lens elements, and controlled thickness-to-focal-length ratios (EFL/T1≤5.70, TTL/T1≤6.90). These parameter changes optimize the balance between compact length and aberration control, allowing the system to maintain short length while reducing chromatic aberration through strategic material and dimensional selections.
Solution Approach 2:
The optical system uses multiple lens elements with different Abbe numbers (dispersion properties), creating a composite optical structure. The first and fourth lens elements have Abbe number difference of at least 20.00, which provides chromatic aberration compensation across the compact four-element design, effectively reducing color fringing without increasing system length.
3Area of stationary object
If the ocular optical system uses conventional lens design, then the viewing angle can be enlarged, but the optical image quality and resolution deteriorate
Solution Approach 1:
The first and third lens elements feature convex portions at their periphery, creating specific curvature patterns that control marginal rays effectively. This curvature design maintains high resolution across the wide field of view by properly directing off-axis rays, preventing image quality degradation that typically occurs when enlarging viewing angles with conventional flat or simply curved surfaces.
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 achieves improved optical image quality with a larger viewing angle and reduced chromatic aberration, enhancing the virtual reality experience by concentrating light effectively and correcting aberrations, while being compact in design.
Implementation Method 1
an ocular optical system from an eye side toward a display side in order along an optical axis has a first lens element, a second lens element, a third lens element and a fourth lens element. Each lens element has an eye-side surface facing toward an eye side as well as a display-side surface facing toward a display side. The ocular optical system exclusively has the first lens element, the second lens element, the third lens element and the fourth lens element with refractive power.
Data Source
AI summary
An ocular optical system has four lens elements, wherein the ocular optical system includes a first lens element having a display-side surface with a convex portion in a vicinity of its periphery, and a third lens element having an eye-side surface with a convex portion in a vicinity of its periphery. In addition, υ1 is an Abbe number of the first lens element, υ4 is an Abbe number of the fourth lens element, and the ocular optical system satisfies the relationship 20.00≤|υ1−υ4|.