Ocular Optical System for Wide Field of View
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Solution Overview
Problem
Existing ocular optical systems for Virtual Reality (VR) devices suffer from narrow vision, low resolution, and severe aberrations, leading to a limited half apparent field of view and compromised imaging quality.
Innovation Solution
The proposed ocular optical system consists of a sequence of three lens elements with specific refracting powers and surface shapes, including aspheric surfaces, to optimize imaging quality and field of view while minimizing system length.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If the system length is shortened, then the device becomes more compact and portable, but the half apparent field of view decreases and imaging quality deteriorates
Solution Approach 1:
The ocular optical system is divided into three distinct lens elements (first, second, and third lens elements) with different refracting powers and surface configurations. Each lens element contributes differently to the overall optical performance, allowing the system to achieve a large half apparent field of view while maintaining a shortened system length. The segmentation enables independent optimization of each element's function.
Solution Approach 2:
The patent employs aspheric surfaces on at least one lens element, transitioning from traditional spherical surfaces to aspheric geometry. This dimensional change in surface shape allows for better control of light rays across different field angles, enabling a large half apparent field of view without increasing system length. The aspheric surfaces correct aberrations that would otherwise limit the field of view in compact systems.
2Length of moving object
If the system length is shortened, then the device becomes more compact, but the imaging quality deteriorates due to severe aberrations
Solution Approach 1:
The optical system is segmented into three lens elements with specific refracting power distributions. The first lens element has positive refracting power, the second has negative refracting power, and the third has positive refracting power. This segmentation allows each element to correct specific types of aberrations, maintaining high imaging quality in a compact configuration.
Solution Approach 2:
The patent utilizes aspheric surfaces on at least one lens element to replace traditional spherical surfaces. The aspheric geometry provides variable curvature that can be optimized to correct multiple types of aberrations simultaneously, including spherical aberration, coma, and astigmatism. This enables high imaging quality to be achieved in a shortened system length without requiring complex multi-element designs.
3Area of stationary object
If the half apparent field of view is increased, then the vision coverage is improved, but the system length increases
Solution Approach 1:
The three-lens-element configuration allows the system to achieve a large half apparent field of view through distributed optical power. Each lens element is optimized for specific field angles, enabling wide field coverage without requiring a long focal length. The first lens element handles central field rays, while the second and third elements correct off-axis rays, collectively achieving wide field of view in a compact form.
Solution Approach 2:
The use of aspheric surfaces enables the system to achieve a large half apparent field of view in a compact configuration. The aspheric geometry provides additional degrees of freedom in ray control, allowing wide field angles to be captured and focused properly without increasing the system length. This dimensional change in surface shape is key to achieving wide field of view in shortened optical systems.
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 effectively enhances the half apparent field of view and maintains favorable imaging quality, even when the system length is shortened, thereby addressing the limitations of existing VR ocular optical systems.
Implementation Method 1
The first lens element has positive refracting power, the second lens element has negative refracting power, and the third lens element has positive refracting power
Data Source
AI summary
An ocular optical system for imaging of imaging rays entering an eye of an observer via the ocular optical system from a display screen is provided. A side facing towards the eye is an eye-side, and a side facing towards the display screen is a display-side. The ocular optical system includes a first lens element, a second lens element, and a third lens element from the eye-side to the display-side in order along an optical axis. The first lens element, the second lens element, and the third lens element each include an eye-side surface and a display-side surface. The ocular optical system satisfies: 40°≤ω, where ω represents a half apparent field of view, which is one half the field of view of an observer.