Five-Element Optical Imaging Lens Compact Design
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Solution Overview
Problem
The challenge is to design an optical imaging lens that maintains good optical properties while being compact, as scaling down existing lenses with good image quality is not feasible due to material characteristics and production issues, particularly in portable electronic devices where space is limited and image quality demands are high, especially in low-light environments.
Innovation Solution
The design incorporates a sequence of five lens elements with specific refractive powers and aspheric surfaces, including convex and concave portions, arranged to optimize optical performance within a shortened system length, adhering to conditions such as TTL/EFL/F# ≤ 2.3, and specific ratios of distances to thicknesses, ensuring effective aberration correction and image quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If the length of optical imaging lens is shortened to minimize image module, then the compactness and slim design are improved, but the optical performance and image quality deteriorate
Solution Approach 1:
The optical imaging lens is divided into five separate lens elements (first through fifth lens elements), each with specific refractive powers and surface configurations. This segmentation allows complex optical functions to be distributed across multiple elements, enabling short overall length while maintaining optical performance through coordinated design of individual elements.
Solution Approach 2:
The patent employs aspheric surfaces on multiple lens elements (at least one aspheric surface per element) with specific convex and concave portions. These curved surfaces enable precise control of light paths, allowing the lens to achieve good image quality and aberration correction within a compact form factor that would be impossible with simple spherical surfaces.
2Volume of moving object
If the dimensions of optical imaging lens are reduced to match smaller sensor sizes, then the image module size is minimized, but the optical quality and field angle performance deteriorate
Solution Approach 1:
Each lens element is designed with specific local characteristics: the first element has positive refractive power with convex portions, the second has negative refractive power, the third has positive refractive power with concave portions, and so on. This local differentiation of optical properties across elements allows the compact lens to achieve comprehensive aberration correction and maintain high image quality despite reduced dimensions.
Solution Approach 2:
The patent specifies precise parameter relationships including conditional expressions for focal lengths, radii of curvature, and thickness ratios (e.g., 0.1 < f2/f1 < 0.5, specific TTL/EFL/F# relationships). These parameter optimizations enable the lens to achieve excellent optical performance within minimized dimensions by carefully tuning each element's optical characteristics.
3Length of moving object
If scaling down a lens with good image quality is attempted, then the lens size is reduced, but the optical performance and assembly yield deteriorate due to material characteristics and production issues
Solution Approach 1:
The lens design incorporates flexible parameters and ratios that can be adjusted within specified ranges (e.g., focal length ratios, thickness ratios) to accommodate manufacturing variations and different material properties. This dynamic design approach allows the lens to maintain optical performance across production tolerances, improving assembly yield while keeping the lens compact.
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 configuration allows for a compact optical imaging lens with improved image quality, reduced spherical and chromatic aberrations, and a broader view angle, while maintaining a slim design, thus addressing the limitations of traditional lenses in portable devices.
Implementation Method 1
Each of the first lens element through the fifth lens element includes an object-side surface that faces the object side and allows imaging rays to pass through as well as an image-side surface that faces the image side and allows the imaging rays to pass through
Implementation Method 2
at least one of the object-side surface and image-side surface of the first lens element is an aspheric surface
Data Source
AI summary
An optical imaging lens includes first, second, third, fourth, and fifth lens elements arranged in sequence from an object side to an image side along an optical axis. Each lens element has an object-side surface and an image-side surface. The image-side surface of the first lens element has a convex portion in an optical axis region. The second lens element has negative refractive power. The object-side surface of the second lens element has a convex portion in an optical axis region. The third lens element has positive refractive power. The image-side surface of the third lens element has a concave portion in an optical axis region. The object-side surface of the fourth lens element has a concave portion in an optical axis region. The object-side surface of the fifth lens element has a convex portion in an optical axis region.