Eight-Lens Camera Optical Lens Design for Large Aperture and Ultra-Thinness
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Solution Overview
Problem
Current miniature camera lenses for handheld devices face challenges in achieving optimal imaging quality due to unreasonable refractive power, lens spacing, and shape, which hinder the design requirements for large aperture, long focal length, and ultra-thinness, despite advancements in semiconductor technology and user demands.
Innovation Solution
A camera optical lens design comprising eight lenses, carefully optimized in refractive power, curvature radii, and thickness ratios to meet specific conditions, ensuring improved optical performance, including a focal length to total optical length ratio, spherical and chromatic aberration correction, and ultra-thinness, while accommodating a large aperture and long focal length.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an eight-piece lens structure is adopted to improve imaging quality, then optical performance is improved, but the lens cannot meet the design requirements for large aperture, long focal length and ultra-thinness
Solution Approach 1:
The patent applies parameter changes by optimizing the focal length ratios between lenses (f1/f, f2/f, f3/f, f4/f, f5/f, f6/f, f7/f within specific ranges), curvature radius ratios ((R1+R2)/(R1-R2), (R3+R4)/(R3-R4), etc.), and thickness ratios (d1/TTL, d3/TTL, d5/TTL, d7/TTL, d9/TTL, d11/TTL, d13/TTL). These parameter optimizations enable the eight-piece lens to achieve large aperture, long focal length, and ultra-thinness while maintaining excellent optical performance
Solution Approach 2:
The patent applies local quality by assigning different refractive powers to different lens elements (positive refractive power for odd-numbered lenses, negative refractive power for even-numbered lenses), and optimizing each lens's curvature radii and thickness independently. This allows each lens element to contribute specifically to correcting certain aberrations while collectively achieving the overall design goals
2Volume of moving object
If pixel size of photosensitive devices is reduced to meet thinner and smaller dimensions, then device compactness is improved, but imaging quality becomes more difficult to achieve
Solution Approach 1:
The patent applies segmentation by dividing the optical system into eight distinct lens elements with alternating positive and negative refractive powers. This segmentation allows for precise control of light paths and aberration correction, enabling high imaging quality to be achieved despite the reduced pixel size and compact form factor
Solution Approach 2:
The patent optimizes multiple parameters including focal length ratios, curvature radius ratios, and thickness ratios to achieve the best imaging quality in a compact design. The optimized parameters enable the lens to maintain excellent optical performance while accommodating smaller pixel sizes and reduced device dimensions
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 optimized lens design achieves excellent optical imaging performance, effectively correcting aberrations and ensuring a large aperture and long focal length, making it suitable for high-pixel CCD and CMOS camera systems.
Implementation Method 1
a first lens having a positive refractive power
Implementation Method 2
an eighth lens... R15 denotes a central curvature radius of an object-side surface of the eighth lens; R16 denotes a central curvature radius of an image-side surface of the eighth lens
Data Source
AI summary
The present disclosure relates to optical lens, and provides a camera optical lens including from an object side to an image side in sequence: a first lens having a positive refractive power, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, and an eighth lens; wherein the camera optical lens satisfies the following conditions: 0.95≤f/TTL; −5.00≤f2/f≤−3.20; and 3.00≤(R15+R16)/(R15−R16)≤20.00. The camera optical lens can achieve good optical performance while meeting design requirements for a large aperture, a long focal length and ultra-thinness.