Nine-Lens Camera Optical Lens Aberration Correction
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Solution Overview
Problem
Current camera lenses for portable devices, such as smartphones, face challenges in achieving a balance of large aperture, ultra-thinness, and wide angle while maintaining good optical performance due to unreasonable refractive power settings and lens spacing in multi-piece lens designs.
Innovation Solution
A camera optical lens design comprising nine lenses with specific refractive power configurations and curvature radii, along with precise focal length and thickness ratios, is proposed to achieve the desired optical performance, including a positive and negative refractive power distribution across the lenses to correct aberrations and ensure ultra-thinness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a traditional multi-piece lens structure (three-piece, four-piece, five-piece, six-piece, or nine-piece) is adopted to improve imaging quality, then the imaging quality is improved, but the lens thickness and overall system complexity increase
Solution Approach 1:
The patent applies parameter changes by precisely controlling the focal length ratios (f1/f, f2/f, f3/f, etc.) and thickness ratios (d1/TTL, d3/TTL, d5/TTL, etc.) of each lens element. The nine-piece lens structure uses specific refractive power distributions and curvature radius ratios to optimize the balance between imaging quality and thinness, achieving TTL ratios as low as 0.44 while maintaining excellent optical performance
Solution Approach 2:
The patent divides the lens system into nine distinct lens elements with alternating positive and negative refractive powers. This segmentation allows each element to be optimized for specific functions (aberration correction, focal length control, thickness reduction), enabling the system to achieve both high imaging quality and ultra-thin profile through coordinated design of individual elements
2Adaptability or versatility
If a nine-piece lens structure is adopted to achieve large aperture and wide angle, then the aperture and angle are improved, but the refractive power settings and lens spacing become unreasonable resulting in insufficient ultra-thinness
Solution Approach 1:
The patent achieves large aperture and wide angle while maintaining ultra-thinness through precise parameter optimization. The focal length ratios (e.g., f1/f = 0.44-0.67, f2/f = 0.89-1.33) and thickness ratios (e.g., d1/TTL = 0.06-0.15, d3/TTL = 0.10-0.20) are carefully controlled to balance optical performance with compact dimensions, enabling the lens to achieve both large aperture/wide angle and ultra-thin profile
Solution Approach 2:
The patent employs dynamic optimization of lens spacing and curvature radii to achieve the desired optical characteristics. By adjusting the on-axis distances between lens elements and the curvature radii of each surface, the system dynamically balances the competing requirements of large aperture, wide angle, and ultra-thinness, allowing the nine-piece structure to adaptively meet multiple performance targets simultaneously
3Volume of moving object
If the pixel size of the photosensitive device is reduced to improve device miniaturization, then the device dimensions are reduced, but the requirement for imaging quality increases
Solution Approach 1:
The patent uses a nine-piece lens structure that segments the optical system into multiple specialized elements. This segmentation allows for precise correction of aberrations that become more prominent with smaller pixel sizes, maintaining high imaging quality despite the reduced device dimensions and smaller sensor area
Solution Approach 2:
The patent optimizes multiple parameters including focal length ratios, thickness ratios, curvature radius ratios, and refractive power distributions to maintain excellent imaging quality in miniaturized devices. The coordinated adjustment of these parameters ensures that the lens system delivers high performance for small-pixel sensors while keeping the overall device 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
The design effectively addresses the challenges by achieving excellent optical performance with a large aperture, wide angle, and ultra-thinness, making it suitable for high-pixel CCD and CMOS camera elements in mobile phones and web cameras.
Implementation Method 1
a first lens having a positive refractive power, a second lens having a positive refractive power, a third lens having a negative refractive power, a fourth lens having a positive refractive power, a fifth lens having a negative refractive power, a sixth lens having a positive refractive power, a seventh lens having a positive refractive power, an eighth lens having a positive refractive power, and a ninth lens having a negative refractive power
Data Source
AI summary
A camera optical lens is provided and includes, from an object side to an image side, a first lens to a ninth lens. Each of the first lens, the second lens, the fourth lens, the sixth lens, the seventh lens, and the eighth lens has a positive refractive power, and each of the third lens, the fifth lens, and the ninth lens has a negative refractive power. The camera optical lens satisfies following conditions: 3.50≤f1/f≤7.00; and 2.00≤d11/d12≤9.00, where f denotes a focal length of the camera optical lens, f1 denotes a focal length of the first lens, d11 denotes an on-axis thickness of the sixth lens, and d12 denotes an on-axis distance from an image side surface of the sixth lens to an object side surface of the seventh lens. The camera optical lens meets design requirements for large aperture, wide angle and ultra-thinness while achieving good optical performance.