Two-Element Optical Imaging Lens for 940 Nm Infrared Capture
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Solution Overview
Problem
The existing optical imaging lenses for portable electronic devices face challenges in imaging 940 nm infrared light with small volume, high forming yield, and cost-effectiveness, while also needing to minimize interference from rainy days and sunlight, and meet the demands of AR and VR applications.
Innovation Solution
The optical imaging lens design consists of two lens elements with specific surface shapes and optical relationships, including convex and concave regions, to achieve high half field of view and optimal imaging quality, while satisfying relationships such as HFOV*T1/(ImgH*Fno)≥12.000 degrees and T1/T2≥1.300, allowing for efficient imaging of 940 nm infrared light.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the optical imaging lens uses more lens elements to improve imaging quality, then the imaging quality is improved, but the lens volume and complexity increase
Solution Approach 1:
The optical imaging lens is segmented into two functional lens elements with specific surface shape configurations. The first lens element has a convex periphery region on its image-side surface, while the second lens element has a concave optical axis region on its image-side surface. This segmentation allows each element to contribute differently to image formation, achieving high imaging quality with minimal components.
Solution Approach 2:
Different regions of the lens surfaces are given different shapes to optimize local optical functions. The periphery region of the first lens element is convex while its optical axis region has different curvature characteristics. Similarly, the second lens element has a concave optical axis region and specific periphery characteristics. This local differentiation enables precise control of light paths across the entire field of view.
2Adaptability or versatility
If the optical imaging lens is designed for 940 nm infrared light imaging, then the infrared imaging capability is improved, but the lens design complexity and cost increase
Solution Approach 1:
The optical imaging lens is designed to function across multiple wavelength ranges including visible light and infrared wavelengths up to 940 nm and beyond. The two lens elements are configured with surface shapes and materials that provide broad spectral transmission, enabling the same lens structure to serve multiple imaging applications without requiring separate specialized lenses for different wavelength ranges.
3Reliability
If the optical imaging lens uses a larger number of lens elements to reduce interference from rainy days and sunlight, then the environmental adaptability is improved, but the manufacturing cost and complexity increase
Solution Approach 1:
The patent extracts and addresses the specific interference problems from environmental factors such as rain and sunlight by optimizing the optical path and surface characteristics of the two lens elements. The concave and convex surface configurations are specifically designed to minimize the impact of external environmental interference on image quality, achieving reliable performance in various weather conditions without adding complex protective structures or additional lens elements.
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 achieves improved imaging quality, reduced volume, and lower production costs, while effectively capturing infrared light in various conditions, enhancing performance for AR and VR applications.
Implementation Method 1
The first lens element and the second lens element respectively have an object-side surface which faces toward the object side to allow imaging rays to pass through as well as an image-side surface which faces toward the image side to allow the imaging rays to pass through
Data Source
AI summary
An optical imaging lens includes a first lens element to a second lens element. The first lens element to the second lens element each having an object-side surface facing toward the object side and allowing imaging rays to pass through as well as an image-side surface facing toward the image side and allowing the imaging rays to pass through. A periphery region of the image-side surface of the first lens element is convex, an optical axis region of the image-side surface of the second lens element is concave. Lens elements included by the optical imaging lens are only the two lens elements mentioned above, and the following conditions: HFOV*T1/(ImgH*Fno)≥12.000, T1/T2≥1.300 are satisfied.