Five-Lens Camera Optical Lens Aberration Correction
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Solution Overview
Problem
Camera lenses for handheld devices face challenges in achieving large aperture, wide angle, and ultra-thinness while maintaining good imaging quality, as existing five-lens configurations require optimization of refractive power, lens spacing, and shape to meet these design requirements.
Innovation Solution
A camera optical lens design comprising five lenses with specific refractive power configurations and curvature radii, including a first lens with positive refractive power, a second and third lens with negative refractive power, a fourth lens with positive refractive power, and a fifth lens with negative refractive power, optimized to meet conditions such as focal length ratios, curvature radius ratios, and on-axis thickness ratios to achieve large aperture, wide angle, and ultra-thinness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a five-lens configuration is used to improve imaging quality, then optical performance is improved, but the lens structure becomes more complex and harder to optimize for large aperture, wide angle and ultra-thinness
Solution Approach 1:
The patent applies parameter changes by precisely controlling the refractive power ratios (f2/f, f5/f), curvature radius ratios (R7/R8, R1+R2)/(R1-R2), and thickness ratios (d5/d6, d1/TTL, d3/TTL, d5/TTL, d7/TTL, d9/TTL) of the five-lens system. These parameter optimizations enable the complex five-lens structure to achieve large aperture (FNO≤2.60), wide angle (FOV≥67.00°), and ultra-thinness (TTL/IH≤1.70) while maintaining good imaging quality.
2Reliability
If refractive power, lens spacing and lens shape are optimized to meet large aperture and wide angle requirements, then optical performance is improved, but the lens becomes thicker
Solution Approach 1:
The patent controls the total optical length to height ratio (TTL/IH≤1.70) and individual lens thickness ratios (d1/TTL, d3/TTL, d5/TTL, d7/TTL, d9/TTL within specified ranges) while optimizing refractive power distribution and lens spacing. This enables the lens system to achieve large aperture and wide angle optical performance while maintaining ultra-thinness.
Solution Approach 2:
The patent addresses the thickness constraint by optimizing the three-dimensional arrangement of five lenses, controlling the axial thickness of each lens and the spacing between lenses. The total optical length is carefully controlled to maintain TTL/IH≤1.70, achieving compact thickness while preserving optical performance through sophisticated spatial configuration.
3Length of moving object
If the lens is made thinner to meet ultra-thinness requirements, then portability is improved, but aberration correction becomes more difficult
Solution Approach 1:
The patent compensates for the thickness constraint by precisely controlling the refractive power distribution across five lenses and optimizing curvature radius ratios (R7/R8, R1+R2)/(R1-R2). The specific parameter ranges for focal length ratios (f2/f, f5/f) and thickness ratios (d5/d6, d1/TTL, d3/TTL, d5/TTL, d7/TTL, d9/TTL) enable effective aberration correction even in the ultra-thin configuration with TTL/IH≤1.70.
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 corrects various aberrations and achieves excellent imaging quality, meeting the requirements for large aperture, wide angle, and ultra-thinness, making it suitable for high-pixel CCD, CMOS, and web camera lenses.
Implementation Method 1
a first lens having positive refractive power; a second lens having negative refractive power; a third lens having negative refractive power; a fourth lens having positive refractive power; and a fifth lens having negative refractive power
Data Source
AI summary
A camera optical lens is provided, including from an object side to an image side: a first lens having positive refractive power; a second lens having negative refractive power; a third lens having negative refractive power; a fourth lens having positive refractive power; and a fifth lens having negative refractive power. The camera optical lens satisfies following conditions: −5.00≤f2/f≤−2.50; 2.00≤d5/d6≤4.00; −4.00≤R7/R8≤−1.30; and −2.00≤(R1+R2)/(R1−R2)≤−1.00. The above camera optical lens may meet design requirements for large aperture, wide angle and ultra-thinness, while maintaining a high imaging quality.