7-Element Camera Lens for Ultra-Thin Wide-Angle Imaging
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
There is a need for ultra-thin wide-angle camera lenses with good optical characteristics and fully corrected chromatic aberration, particularly for handheld devices like smartphones and digital cameras, where the shrinking pixel size of photosensitive devices and increasing imaging quality demands require advanced lens designs.
Innovation Solution
A 7-piece camera optical lens structure is designed, with specific conditions for the focal lengths, refractive indices, and curvature radii of each lens to achieve ultra-thin and wide-angle capabilities, including the use of plastic and glass materials, and an optical filter to correct aberrations and enhance imaging quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the number of lens pieces is increased to improve imaging quality, then chromatic aberration correction and imaging quality improve, but device complexity and manufacturing difficulty increase
Solution Approach 1:
The lens system is divided into 7 separate lens pieces with specific focal length ratios (f1/f2 between 1.5-2.5, f3/f4 between -0.5-0.5). Each lens piece has specific refractive index ranges (n1: 1.5-1.6, n2: 1.7-2.0, n3: 1.7-2.2, n4: 1.5-1.6) and shape characteristics that work together to correct chromatic aberration while maintaining manageable manufacturing complexity through standardized design parameters
Solution Approach 2:
The patent employs a composite lens structure combining different material types - plastic lenses (L1, L4, L5, L6, L7) and glass lenses (L2, L3) - each with specific refractive index ranges. This composite approach allows optimization of each lens piece for its specific function while achieving overall chromatic aberration correction across the 7-piece system
2Length of moving object
If the lens is designed to be ultra-thin to meet miniaturization requirements, then device thickness decreases, but optical performance and aberration correction become more difficult to achieve
Solution Approach 1:
The patent achieves ultra-thin design by precisely controlling key parameters: total optical length TTL is constrained to 0.8mm < TTL ≤ 2.0mm, and each lens piece has specific thickness ratios (d1/f1, d2/f2, etc.) within defined ranges. The focal length ratios (f1/f2: 1.5-2.5, f3/f4: -0.5-0.5) and refractive index ranges are optimized to maintain adequate optical power distribution across the thin structure, enabling both miniaturization and acceptable optical performance
3Adaptability or versatility
If the lens is designed for wide-angle capability to meet diverse user demands, then field of view increases, but chromatic aberration and optical characteristics become harder to control
Solution Approach 1:
The 7-piece lens structure segments the optical power distribution across multiple elements with specific focal length ratios (f1/f2: 1.5-2.5, f3/f4: -0.5-0.5). This segmentation allows each lens piece to contribute specifically to wide-angle capability while the collective arrangement corrects chromatic aberration through coordinated design of refractive indices and surface curvatures
Solution Approach 2:
The patent uses composite materials - plastic lenses (L1, L4, L5, L6, L7) with refractive indices n1: 1.5-1.6, n4: 1.5-1.6, n5: 1.6-1.7, n6: 1.7-1.9, n7: 1.6-1.8 combined with glass lenses (L2, L3) with n2: 1.7-2.0, n3: 1.7-2.2 - to achieve wide-angle capability while correcting chromatic aberration through the complementary optical properties of different materials
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 7-piece lens design achieves high-performance imaging with reduced sensitivity and corrected aberrations, maintaining miniaturization characteristics and improving image quality, suitable for diverse user demands and technological advancements.
Implementation Method 1
an optical filter to correct aberrations and enhance imaging quality
Implementation Method 2
A 7-piece camera optical lens structure is designed, with specific conditions for the focal lengths, refractive indices, and curvature radii of each lens
Data Source
AI summary
The present disclosure discloses a camera optical lens. The camera optical lens including, in an order from an object side to an image side, a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens and a seventh lens. The camera optical lens further satisfies specific conditions.