7-Element Camera Lens Design for Aberration Correction
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Solution Overview
Problem
There is a growing demand 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 requirements are not adequately met by existing lens structures.
Innovation Solution
A 7-piece camera optical lens design is proposed, with specific conditions for the focal lengths, refractive powers, and curvature radii of its components, including glass and plastic lenses, to achieve ultra-thin and wide-angle capabilities while correcting aberrations, ensuring high performance and low total optical length.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If traditional three-piece or four-piece lens structure is used, then the lens structure is simple and easy to manufacture, but the imaging quality is insufficient and chromatic aberration is not fully corrected
Solution Approach 1:
The lens system is divided into seven separate lens elements with specific optical powers and materials. This segmentation allows each element to be optimized for specific aberration correction while maintaining overall system performance, resolving the contradiction between manufacturing simplicity and imaging quality by distributing complexity across multiple manageable components.
Solution Approach 2:
The patent employs composite material design by combining different glass types (positive and negative dispersion materials) and plastic materials in specific lens elements. This allows simultaneous correction of chromatic and spherical aberrations while maintaining the ultra-thin profile, achieving high imaging quality without proportionally increasing structural complexity.
2Manufacturing precision
If more lens pieces are added to improve imaging quality, then chromatic aberration correction improves, but the total optical length increases and the lens becomes less ultra-thin
Solution Approach 1:
The patent applies parameter changes by carefully controlling the optical power, refractive index, and Abbe number of each lens element. Specific conditions are imposed on focal length ratios (0.3<f2/f<−0.6, −2<f3/f4≤2) and curvature radii to optimize the balance between aberration correction and compactness, enabling ultra-thin design with seven elements rather than requiring fewer, larger elements.
Solution Approach 2:
Different lens elements are assigned specific local qualities through material selection and geometric design. For example, the fourth lens uses negative dispersion material specifically for chromatic aberration correction, while the sixth lens uses positive dispersion material. This localized optimization allows effective aberration correction without uniformly increasing the optical path length.
3Adaptability or versatility
If the lens is designed for wide-angle application, then the field of view increases, but the optical characteristics deteriorate and aberration correction becomes more difficult
Solution Approach 1:
The patent employs dynamic surface design through aspherical surfaces on multiple lens elements (first, third, fourth, sixth, and seventh lenses). The aspherical coefficients are optimized to maintain excellent optical characteristics across the wide field of view (70° or more), allowing the lens to adapt to wide-angle requirements without sacrificing imaging quality or aberration correction performance.
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 effectively corrects on-axis and off-axis chromatic aberrations, maintains miniaturization, and enhances imaging quality, making it suitable for high-performance, ultra-thin, and wide-angle applications in handheld devices.
Implementation Method 1
the first lens L1 has a positive refractive power; the second lens L2 has a negative refractive power; the third lens L3 has a negative refractive power; the fourth lens L4 has a positive refractive power; the fifth lens L5 has a positive refractive power; the sixth lens L6 has a positive refractive power; the seventh lens L7 has a negative refractive power
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.