Ocular Optical System Compact Design Wide Field of View
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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 four lens elements, controlling refracting power and surface shape to shorten the system length while maintaining good optical characteristics and broadening the half apparent field of view, by optimizing parameters like air gaps and lens thicknesses, and incorporating aspherical surfaces to adjust aberrations.
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 too small and astigmatism and distortion aberrations become too large
Solution Approach 1:
The imaging lens is divided into multiple lens elements (first through fourth lens elements) with different optical functions. Each element contributes to correcting specific aberrations while maintaining a compact overall size, allowing the system to achieve a wide angle of view without increasing total device volume.
Solution Approach 2:
Different regions of the lens elements have different optical properties. Specifically, the lens elements incorporate both spherical and aspherical surfaces with varying curvatures in different zones to correct local aberrations (astigmatism and distortion) while maintaining the compact form factor.
2Volume of moving object
If the size of imaging lens is reduced, then the device becomes more compact, but image quality deteriorates due to increased aberrations
Solution Approach 1:
The patent employs aspherical surfaces with specific mathematical parameters (aspherical coefficients) to correct aberrations. By carefully controlling the shape parameters of each lens element's surfaces, the system maintains high image quality in a compact configuration, overcoming the limitations of simple spherical surfaces in small lenses.
3Adaptability or versatility
If four lens elements are used to correct aberrations and broaden angle of view, then optical characteristics improve, but system length increases
Solution Approach 1:
The four lens elements are arranged in a compact sequence along the optical axis with minimized spacing. Each element is positioned to work synergistically with adjacent elements, creating a nested-like configuration where the total length is optimized. The design ensures that the cumulative optical power and aberration correction are achieved within a minimal axial distance.
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 design achieves improved image quality and a wider angle of view while minimizing the system's length, effectively addressing the limitations of conventional systems.
Implementation Method 1
first, second, third and fourth lens elements, each of the first, second, third and fourth lens elements having an eye-side surface facing toward the eye side and a display-side surface facing toward the display side
Data Source
AI summary
Present embodiments provide for ocular optical systems. An ocular optical system for imaging of imaging rays entering an eye of an observer via the ocular optical system and a pupil of the eye of the observer from a display screen, may comprise four lens elements positioned sequentially from an eye side to a display side. By controlling the refracting power and the surface shape of the lens elements and designing parameters satisfying at least one inequality, the ocular optical system may exhibit better optical characteristics and the half apparent field of view of the ocular optical system may be broadened.