Six-Element Optical Lens Assembly for Thermal-Stable Large Aperture
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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 across varying ambient temperatures while accommodating light sources of different wavebands, particularly for applications in augmented reality and virtual reality devices.
Innovation Solution
The optical lens assembly comprises a sequence of 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 thermal stability and optical performance across temperature variations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If the optical lens assembly uses a compact design with multiple lens elements, then the system length is reduced, but the complexity of the lens structure increases
Solution Approach 1:
The optical lens assembly is divided into six separate lens elements (first lens element, second lens element, third lens element, fourth lens element, fifth lens element, and sixth lens element) with different refracting powers. This segmentation allows each lens to contribute specific optical functions while collectively achieving a compact system length that would be difficult to achieve with a single lens element.
Solution Approach 2:
The multi-element lens structure is designed to simultaneously accommodate light sources of different wavebands (visible light, infrared, ultraviolet) and maintain optimal optical performance across varying ambient temperatures. This universal design enables the same lens assembly to serve multiple functions in augmented reality and virtual reality applications without requiring separate optical systems.
2Area of stationary object
If the optical lens assembly is designed for large aperture, then the light-gathering capability is improved, but the system length increases
Solution Approach 1:
The lens assembly utilizes the dimensional arrangement of multiple lens elements along the optical axis to achieve a large effective aperture. By stacking six lens elements with varying refracting powers in sequence, the system achieves extended light-gathering capability in the aperture dimension while maintaining a compact overall system length through efficient spatial utilization.
3Stability of the object's composition
If the optical lens assembly is designed for thermal stability, then the focal shift is reduced, but the manufacturing precision requirements increase
Solution Approach 1:
The lens assembly employs conditional expressions that define specific relationships between the refracting powers and Abbe numbers of different lens elements (e.g., V1+V2+V6≤120.000, EFL×Fno/D11t22≤11.500). These parameter constraints are designed to balance thermal stability requirements with manufacturability, allowing for controlled focal shift across temperature variations while maintaining practical manufacturing tolerances.
Solution Approach 2:
The optical lens assembly combines multiple lens elements with different material properties (different refracting powers and Abbe numbers) to achieve thermal stability. The composite structure of six lens elements with varying optical characteristics allows the system to compensate for thermal expansion and refraction changes, reducing focal shift while maintaining reasonable manufacturing precision requirements.
4Adaptability or versatility
If the optical lens assembly accommodates multiple wavebands, then the versatility is improved, but the optical quality may deteriorate
Solution Approach 1:
Each lens element in the sequence is designed with specific local optical characteristics (different refracting powers and Abbe numbers) optimized for particular wavebands. The first lens element, second lens element, third lens element, fourth lens element, fifth lens element, and sixth lens element each contribute to transmitting specific portions of the electromagnetic spectrum while maintaining overall optical quality through their coordinated arrangement.
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, allows light of multiple wavelengths to pass through, reduces system length, and exhibits minimal focal shift (≤0.030 mm) over a temperature range of 0° C. to 70° C., while being thermally stable.
Implementation Method 1
The first lens element has negative refracting power... 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
Implementation Method 2
an optical lens assembly, which sequentially includes an aperture, a first lens element, a second lens element, a third lens element, a fourth lens element, a fifth lens element, and a sixth lens element from a first side to a second side along an optical axis
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.