Seven-Element Camera Optical Lens for Ultra-Thin Wide-Angle Imaging
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Solution Overview
Problem
There is an urgent need for a wide-angle imaging lens with excellent optical characteristics, small size, and fully corrected aberration, particularly for handheld devices such as smartphones and digital cameras, due to the miniaturization of camera optics and increasing pixel density requirements.
Innovation Solution
A seven-piece camera optical lens design with specific refractive power and curvature radius conditions for each lens, including materials like plastic, to achieve ultra-thin, wide-angle, and large aperture performance, with optimized aberration correction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a multi-piece lens structure is used to improve image quality, then imaging quality is improved, but device complexity increases
Solution Approach 1:
The lens system is divided into seven separate lens elements with specific refractive power distributions. Each lens element has optimized curvature radii and thickness ratios that work together to correct various optical aberrations, achieving superior imaging quality through segmented design
Solution Approach 2:
Specific parameter ranges are established for each lens element including focal length ratios (f1/f6, f2/f, f3/f, f4/f, f5/f), curvature radius ratios (R3/R4, (R1+R2)/(R1-R2)), and thickness ratios (d1/TTL, d3/TTL, d5/TTL, d7/TTL, d9/TTL, d11/TTL, d13/TTL). These parameter optimizations enable aberration correction while controlling overall system complexity
2Quantity of substance
If the pixel area of the photosensitive device shrinks to increase pixel density, then pixel density increases, but aberration correction becomes more difficult
Solution Approach 1:
Different regions of the lens system are optimized for specific functions. The first lens has a convex object side surface for broad light gathering, while subsequent lenses have alternating concave and convex surfaces tailored to correct specific aberrations at different field positions, enabling effective aberration control for high-density pixel arrays
Solution Approach 2:
Aspherical surfaces are incorporated into multiple lens elements with specifically designed curvature profiles. The curvature radii ratios (R3/R4≥1.00, (R1+R2)/(R1-R2) within specified ranges) create non-spherical surface geometries that effectively correct spherical aberration and other distortions, maintaining image quality across the entire sensor array
3Measurement precision
If the system requirements for image quality increase, then image quality improves, but lens design complexity increases
Solution Approach 1:
The lens design incorporates adjustable parameters within specified ranges rather than fixed values. The focal length ratios (0.37≤f1/f6≤1.21, 0.60≤f1/f≤0.97, 1.66≤f2/f≤44.41, −3.41≤f3/f≤−0.62, 0.97≤f4/f≤10.79, 1.11≤f5/f≤5.98) and curvature ratios provide design flexibility that simplifies the optimization process while meeting high image quality requirements
Solution Approach 2:
The seven-lens system is structured with nested functional groups where the first lens handles broad light gathering and initial aberration control, while subsequent lenses (second through seventh) are nested within the optical path to progressively correct specific aberration types. This nested arrangement systematically addresses complex image quality requirements through hierarchical optimization
4Length of moving object
If an ultra-thin design is implemented to reduce device size, then device thickness decreases, but optical performance may deteriorate
Solution Approach 1:
The thickness of each lens element is optimized as a ratio of the total optical length (TTL). Specific ranges are established: 0.04≤d1/TTL≤0.15, 0.02≤d3/TTL≤0.08, 0.02≤d5/TTL≤0.06, 0.02≤d7/TTL≤0.09, 0.04≤d9/TTL≤0.14, 0.05≤d11/TTL≤0.25, 0.04≤d13/TTL≤0.16. These parameter optimizations enable ultra-thin overall design while maintaining adequate optical performance through efficient light path management
Solution Approach 2:
High-curvature aspherical surfaces are employed in the thin lens elements to achieve the necessary optical power in reduced thickness. The curvature radius ratios (R3/R4≥1.00, (R1+R2)/(R1-R2) within specified ranges) create steep surface profiles that concentrate optical action in thin sections, enabling ultra-thin design without sacrificing imaging quality
5Area of moving object
If a wide-angle design is used to increase field of view, then field of view increases, but aberration correction becomes more challenging
Solution Approach 1:
The wide-field view is divided into multiple optical zones handled by different lens elements. The first lens with convex object side captures broad angles, while subsequent lenses with alternating surface curvatures correct off-axis aberrations specific to different field regions, enabling wide-angle performance with controlled aberrations
Solution Approach 2:
Aspherical surfaces with specifically designed curvature radii are used throughout the lens system to correct off-axis aberrations that become prominent in wide-angle designs. The curvature ratios (R3/R4≥1.00, (R1+R2)/(R1-R2) within specified ranges) create surface profiles that maintain sharp focus and minimize distortion across the entire wide field of view
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 lens provides excellent optical characteristics with a large aperture, wide-angle view, and ultra-thin design suitable for mobile camera lenses and web cameras, ensuring high imaging quality and reduced sensitivity.
Implementation Method 1
a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens and a seventh lens
Data Source
AI summary
The present invention discloses a camera optical lens with seven-piece lenses including, from an object side to an image side in sequence, 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 satisfies the following conditions: −1.00≤f6/f≤10.00, 1.00≤d5/d6≤5.00, and 1.00≤R3/R4≤5.00. The camera optical lens according to the present invention has excellent optical characteristics, such as large aperture, wide-angle, and ultra-thin.