Six-Lens Optical Imaging System for AR Glasses
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Solution Overview
Problem
Augmented reality (AR) glasses require an optical imaging system that maintains high resolution and consistent performance despite ambient temperature changes, which existing systems fail to achieve effectively.
Innovation Solution
An optical imaging system comprising a sequence of lenses with specific refractive powers and surface curvatures, including a first lens with positive refractive power and a concave object-side surface, a second lens with negative refractive power and a convex object-side surface, and a sixth lens with negative refractive power and a convex object-side surface, optimized to maintain f-number and Abbe number conditions, ensuring non-degraded performance across varying temperatures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If existing optical imaging systems are used in AR glasses, then the device can be manufactured, but the optical performance degrades with ambient temperature changes
Solution Approach 1:
The patent applies parameter changes by carefully selecting and optimizing the refractive indices, Abbe numbers, and focal lengths of each lens in the six-lens system. The conditional expressions define specific ranges for these optical parameters to ensure that the overall optical performance remains stable across temperature variations. This is achieved by balancing the temperature-dependent properties of individual lenses through precise parameter selection.
Solution Approach 2:
The patent employs composite material principles by combining multiple lenses made of different optical materials with varying thermal properties. Each lens is assigned specific material characteristics (refractive index, Abbe number) that complement the others, creating a composite optical system where the temperature-induced changes in individual components offset each other, resulting in overall performance stability.
2Measurement precision
If high resolution is achieved through complex lens systems, then image quality improves, but device size and weight increase
Solution Approach 1:
The patent divides the optical imaging system into six distinct lens elements, each with specific refractive power and surface curvature characteristics. This segmentation allows for optimized light path control and aberration correction across the system, achieving high resolution while keeping individual lens elements compact and lightweight.
Solution Approach 2:
The patent utilizes both convex and concave surfaces on lens elements, effectively using dimensional variation in surface geometry to control optical properties. By employing aspherical surfaces and varying curvature in multiple dimensions, the system achieves high resolution imaging with reduced overall size compared to traditional spherical lens systems.
3Reliability
If optical performance is maintained across wide temperature range, then reliability improves, but manufacturing complexity increases
Solution Approach 1:
The patent specifies concrete parameter ranges for each lens (refractive index, Abbe number, focal length, surface curvature) that can be achieved through standard manufacturing processes. The conditional expressions define practical ranges that balance thermal stability requirements with manufacturability, avoiding overly stringent specifications that would excessively complicate manufacturing.
Solution Approach 2:
The six-lens design serves multiple functions simultaneously: it corrects various types of optical aberrations (spherical, chromatic, coma), maintains focal length stability across temperature ranges, and achieves high resolution imaging. This multi-functionality is integrated into a single compact system rather than requiring separate components for each function, thereby managing manufacturing complexity.
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 achieves high resolution and reliability for AR devices by maintaining optical performance across a wide temperature range, reducing the size and weight of the device while ensuring operational reliability from -20 to 60 degrees Celsius.
Implementation Method 1
a first lens having positive refractive power, and having a concave object-side surface; a second lens having refractive power; a third lens having refractive power; a fourth lens having negative refractive power; a fifth lens having a convex image-side surface; and a sixth lens having refractive power
Data Source
AI summary
An optical imaging system is provided. The optical imaging system includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens sequentially disposed from an object side to an imaging side. In the optical imaging system, the first lens has positive refractive power and has a concave object-side surface, the fourth lens has negative refractive power, and the fifth lens has a convex image-side surface. Additionally, the optical imaging system satisfies the following conditional expressions: f number<1.90 and 1.90<TTL/f<2.2. In the conditional expressions, TTL is a distance from an object-side surface of the first lens to an image plane, and f is a focal length of the optical imaging system.