Eight-Lens Optical Imaging Group for Ultra-Thin High Quality
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Solution Overview
Problem
The challenge is to design an optical imaging lens group for portable electronic products that achieves higher imaging quality with higher pixel image sensors and advanced image processing while maintaining or reducing the size of the lens assembly, as increasing the number of lens elements improves imaging quality but contradicts the trend of ultra-thin designs.
Innovation Solution
The optical imaging lens group consists of eight lenses with specific refractive powers and surface shapes, including positive and negative refractive powers, convex and concave surfaces, and carefully controlled focal lengths and radii of curvature, which are arranged to optimize image quality and minimize size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the number of lens elements is increased to improve imaging quality, then imaging quality is improved, but the size of the lens assembly increases
Solution Approach 1:
The patent applies parameter changes by precisely controlling the refractive power, radius of curvature, and thickness of each lens element. The eight lenses have specific refractive powers (positive or negative) and surface curvatures that are optimized to achieve high imaging quality while maintaining a compact overall size. This resolves the contradiction by finding optimal parameter values that balance performance and size.
Solution Approach 2:
The patent divides the optical system into eight distinct lens elements with different refractive powers and surface shapes. Each lens element (first through eighth lenses) has specific optical characteristics that contribute to correcting different types of aberrations. This segmentation allows complex optical functions to be distributed across multiple elements, achieving high imaging quality without excessive overall size.
2Manufacturing precision
If the number of lens elements is increased to correct various aberrations, then imaging quality is improved, but the lens assembly becomes thicker
Solution Approach 1:
The patent uses parameter changes by optimizing the thickness and refractive power of each lens element. The conditional expressions constrain the thickness-to-focal-length ratios, ensuring that each lens contributes to aberration correction while limiting the overall thickness. This allows effective aberration correction in a thin profile.
Solution Approach 2:
The patent employs a combination of positive and negative refractive power lenses that dynamically balance each other's optical effects. The alternating signs of refractive power allow for compact design where the optical paths are folded back on themselves, reducing the overall thickness while maintaining correction capability.
3Manufacturing precision
If more lens elements are used to achieve higher pixel image quality, then image quality is improved, but device complexity increases
Solution Approach 1:
The patent manages complexity through standardized parameter relationships expressed as conditional expressions. The ratios of radii of curvature and thicknesses to focal lengths are constrained within specific ranges, providing a systematic design framework that simplifies the optimization process despite having eight lens elements. This parameter-based approach makes the complex system more manageable.
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 achieves large aperture, low sensitivity, and high image quality while maintaining an ultra-thin profile, effectively addressing the need for improved imaging performance in compact devices.
Implementation Method 1
Each of the first through the eighth lenses has refractive power
Data Source
AI summary
The present disclosure discloses an optical imaging lens group including, sequentially from an object side to an image side along an optical axis, a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens and an eighth lens, each of which has refractive power. Each of the first lens and the fourth lens has positive refractive power. The eighth lens has negative refractive power. An object-side surface of the third lens is a convex surface, and an image-side surface thereof is a concave surface. An object-side surface of the fourth lens is a concave surface, and an image-side surface thereof is a convex surface. A total effective focal length f of the optical imaging lens group, an effective focal length f2 of the second lens, and an effective focal length f3 of the third lens satisfy |f/f2|+|f/f3|<1.