Six-Element Optical Lens Assembly for Thermal Stability
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Solution Overview
Problem
The challenge lies in designing an optical lens assembly that is compact, has a large aperture, maintains good optical quality, and is thermally stable, while accommodating light sources of different wavebands and varying ambient temperatures, particularly for use in both indoor and outdoor environments, including virtual and augmented reality applications.
Innovation Solution
The optical lens assembly comprises six lens elements with specific refracting powers and surface shapes, including convex and concave configurations, adhering to conditional expressions such as V1+V2+V6≤120.000 and EFL*Fno/D11t22≤11.500, ensuring good thermal stability and optical performance across multiple wavelengths.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the optical lens assembly uses multiple lens elements to correct aberrations and maintain optical quality, then the optical performance is improved, but the system length increases
Solution Approach 1:
The patent employs a compact six-element lens design where lens elements are closely spaced and nested within a confined optical path. The conditional expression EFL×Fno/D11t22≤11.500 constrains the system length by limiting the distance from the first lens element to the second lens element, achieving high optical quality through careful arrangement of multiple elements without proportionally increasing overall system length
Solution Approach 2:
The patent utilizes specific parameter constraints including the Abbe number sum V1+V2+V6≤120.000 and the normalized system length EFL×Fno/D11t22≤11.500 to optimize the balance between optical quality and compactness. By controlling refractive indices, dispersion properties, and spacing parameters, the design achieves high imaging performance in a shortened system configuration
2Illumination intensity
If the optical lens assembly is designed for large aperture to gather more light, then the light gathering capability is improved, but the thermal stability deteriorates due to increased sensitivity to temperature variations
Solution Approach 1:
The patent employs the Abbe number constraint V1+V2+V6≤120.000 to control chromatic aberration and dispersion characteristics across different wavelengths. By selecting lens materials and designing surface curvatures that satisfy this condition, the system maintains consistent optical performance across varying temperatures and wavelengths, achieving both large aperture capability and thermal stability
Solution Approach 2:
Different lens elements are assigned specific refractive properties and surface configurations tailored to their positions in the optical path. The first lens element has negative refracting power while subsequent elements have positive power, with specific surface shapes (convex or concave optical axis regions) designed to compensate for thermal and chromatic effects locally, ensuring overall system stability
3Adaptability or versatility
If the optical lens assembly uses complex lens configurations to accommodate different wavebands, then the multi-wavelength performance is improved, but the device complexity increases
Solution Approach 1:
The six-element lens assembly is designed to universally handle multiple wavelengths and different light sources (including VCSELs at various wavelengths) through a unified optical configuration. The conditional expressions V1+V2+V6≤120.000 and EFL×Fno/D11t22≤11.500 ensure that the same lens structure achieves high performance across different wavebands without requiring wavelength-specific adjustments, simplifying the overall device architecture
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 design maintains good optical quality, reduces system length, and provides thermal stability with minimal focal shift (≤0.030 mm) across temperatures from 0°C to 70°C, allowing light of multiple wavelengths to pass through effectively.
Implementation Method 1
Each of the first lens element to the sixth lens element includes a first side surface that faces the first side and allows an imaging ray to pass through, and a second side surface that faces the second side and allows an imaging ray to pass through
Data Source
AI summary
An optical lens assembly, sequentially including a first lens element to a sixth lens element from a first side to a second side along an optical axis, is provided. The optical lens assembly satisfies the conditional expressions of V1+V2+V6≤120.000 and EFL*Fno/D11t22≤11.500. Furthermore, other optical lens element assemblies are also provided.