Ocular Optical System for VR with Compact Lens Design
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Solution Overview
Problem
Existing ocular optical systems for Virtual Reality (VR) devices have a limited half apparent field of view, leading to narrow vision and aberrations, which necessitate aberration compensation and restrict the imaging quality.
Innovation Solution
An ocular optical system comprising a first lens element with positive refracting power and a second lens element with negative refracting power, optimized in terms of surface shapes and refracting powers, to achieve a larger apparent field of view and improved imaging quality while shortening the system length.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the system length is reduced to make VR devices more compact, then the device volume decreases, but the half apparent field of view becomes smaller and imaging quality deteriorates
Solution Approach 1:
The optical system is divided into multiple lens elements (first lens element with positive refracting power and second lens element with negative refracting power) that work together to achieve compact size while maintaining a large field of view. Each lens element is optimized for specific functions to resolve the contradiction between size reduction and field of view maintenance.
Solution Approach 2:
The patent applies specific parameter relationships (1.5≤|f2/f1| and 250 millimeters/EFL≤10) to optimize the optical system. By carefully controlling focal lengths and refracting powers of individual lens elements, the system achieves compact dimensions without sacrificing the half apparent field of view, directly resolving the technical contradiction.
2Volume of moving object
If the system length is reduced, then the device becomes more compact, but aberrations increase and imaging quality deteriorates
Solution Approach 1:
The patent converts the potential harm of compact design (which typically increases aberrations) into a benefit by carefully designing the lens elements with specific refracting powers and surface shapes. The negative refracting power of the second lens element compensates for aberrations introduced by the compact configuration, transforming the disadvantage into an advantage for maintaining imaging quality.
Solution Approach 2:
By optimizing optical parameters including focal lengths, refracting powers, and surface curvatures of the lens elements, the system achieves compact size while controlling aberrations. The specific parameter relationship 1.5≤|f2/f1| ensures that aberrations are minimized even in the compact configuration, resolving the contradiction between size reduction and aberration control.
3Area of stationary object
If lens elements are optimized for large field of view, then the half apparent field of view increases, but the system length increases
Solution Approach 1:
Instead of using a traditional positive-only lens configuration that would require longer system length for large field of view, the patent inverts the approach by incorporating a second lens element with negative refracting power. This inverted configuration achieves large half apparent field of view while maintaining compact system length, directly resolving the technical contradiction.
Solution Approach 2:
The patent employs specific parameter relationships (1.5≤|f2/f1| and 250 millimeters/EFL≤10) to achieve an optimal balance between field of view and system length. By carefully controlling the focal length ratio and effective focal length, the system attains large half apparent field of view without proportionally increasing system 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
The system provides a favorable imaging quality with an enlarged half apparent field of view and reduced system length, effectively addressing the limitations of existing VR ocular optical systems by minimizing aberrations and enhancing user experience.
Implementation Method 1
The ocular optical system includes a first lens element and a second lens element from the eye-side to the display-side in order along an optical axis. The first lens element and the second lens element each include an eye-side surface and a display-side surface.
Data Source
AI summary
An ocular optical system includes a first lens element and a second lens element from an eye-side to a display-side in order along an optical axis. The first lens element and the second lens element each include an eye-side surface and a display-side surface. The eye-side surface of the first lens element has a convex portion in a vicinity of the optical axis. The second lens element has negative refracting power. The ocular optical system satisfies 1.5≤|f2/f1| and 250 millimeters/EFL≤10, wherein f2 is the focal length of the second lens element, f1 is the focal length of the first lens element, and EFL is the effective focal length of the ocular optical system.