Six-Lens Imaging System Aberration Correction
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Solution Overview
Problem
Existing imaging lenses fail to achieve a wide angle of view while maintaining high imaging performance from central to peripheral angles, particularly in devices like smart phones and tablet terminals, which require high resolution and wide-angle capabilities.
Innovation Solution
A six-lens imaging lens configuration with specific refractive powers and surface shapes, including a meniscus-shaped first lens with negative power, a biconvex second lens, a biconcave third lens, and a sixth lens with negative power and an inflection point, optimized to satisfy conditional formulas for focal lengths and radii of curvature, enhancing the lens system's performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a six-lens configuration is used to improve imaging performance, then high resolution and aberration correction are achieved, but the lens system length increases
Solution Approach 1:
The patent applies parameter changes by optimizing the refractive indices and Abbe numbers of each lens element. Specifically, it sets the refractive index of the sixth lens between 1.6 and 2.1, and its Abbe number between 20 and 60, allowing the lens to achieve high imaging performance with a more compact configuration. This parameter optimization enables the sixth lens to effectively correct aberrations while maintaining a shorter overall lens length.
Solution Approach 2:
The patent implements local quality by giving each lens element specific functional characteristics. The sixth lens is designed with a negative refractive power and specific surface curvature (R6r) to correct peripheral aberrations, while the fifth lens has positive refractive power to counterbalance field curvature. This localized functional assignment allows each lens to contribute optimally to image quality without requiring excessive total length.
2Adaptability or versatility
If the angle of view is widened to capture more scene, then wide-angle imaging is achieved, but imaging performance at peripheral angles deteriorates
Solution Approach 1:
The patent uses parameter changes by establishing specific relationships between the focal length (f), half angle of view (ω), and the radius of curvature of the sixth lens (R6r). The conditional formula 0.3 < f·tanω/R6r < 1.5 optimizes the balance between wide angle of view and peripheral image quality. By controlling this parameter relationship, the lens achieves a wide angle of view while maintaining high imaging performance across the entire field.
Solution Approach 2:
The sixth lens serves multiple functions: it corrects spherical aberration, coma, and field curvature simultaneously while enabling a wide angle of view. The positive fifth lens and negative sixth lens work together as an integrated unit to achieve both wide-angle capability and high imaging performance, making the lens system universally effective across central and peripheral angles.
3Manufacturing precision
If more lens elements are added to improve performance, then imaging quality increases, but device complexity increases
Solution Approach 1:
The patent reduces complexity by optimizing the parameter ranges of existing six lens elements rather than adding more lenses. By setting specific constraints on refractive indices, Abbe numbers, and surface curvatures, the design achieves high performance with a manageable six-element configuration, avoiding the complexity of seven or more elements.
Solution Approach 2:
Each lens element is assigned a specific function: the first lens (negative power) corrects spherical aberration, the second lens (positive power) corrects coma, the third lens (negative power) corrects astigmatism, the fourth lens (positive power) corrects field curvature, the fifth lens (positive power) counterbalances field curvature, and the sixth lens (negative power) corrects peripheral aberrations. This localized functional assignment achieves comprehensive aberration correction with only six elements, maintaining simplicity while maximizing 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 configuration achieves a wide angle of view and high imaging performance from central to peripheral angles, enabling high-resolution images and correcting aberrations such as spherical and chromatic aberrations, while shortening the total lens system length.
Implementation Method 1
a sixth lens having a negative refractive power, a concave surface toward the image side, and at least one inflection point on the surface toward the image side
Implementation Method 2
imaging lens for forming optical images of subjects onto an imaging element
Data Source
AI summary
An imaging lens substantially includes six lenses, constituted by: a first lens having a negative refractive power, which is of a meniscus shape having a concave surface toward an image side; a second lens; a third lens; a fourth lens; a fifth lens having a positive refractive power; and a sixth lens having a negative refractive power, a concave surface toward the image side, and at least one inflection point in the surface toward the image side; provided in this order from an object side. The imaging lens satisfies a predetermined conditional formula.