Six-Piece Wide-Angle Lens Module Aberration Control
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Solution Overview
Problem
Wide-angle lenses face challenges in combining characteristics of large-aperture, small field curvature, and minimizing chromatic aberration, while also accommodating miniature image pickup requirements.
Innovation Solution
A six-piece wide-angle lens module is designed with specific refractive power configurations and optical axis relationships, including a first lens group with negative and positive refractive powers, and a second lens group with biconvex and biconcave lenses, optimized by aspheric surface coefficients to achieve a balanced focal length ratio and reduce aberrations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a wide-angle lens design is used to achieve shorter focal length and larger viewing angle, then the depth of field and scenery coverage are improved, but chromatic aberration and field curvature increase significantly
Solution Approach 1:
The lens is divided into six separate lens elements with different refractive powers and surface curvatures. The first lens group (L1-L3) with negative refractive power handles wide-angle light reception, while the second lens group (L4-L6) with positive refractive power corrects chromatic aberration and field curvature. This segmentation allows each element to be optimized for its specific function, resolving the contradiction between wide viewing angle and chromatic aberration control.
Solution Approach 2:
Different regions of the lens system are assigned different optical properties. The first lens group uses negative refractive power elements with specific surface curvatures to achieve wide-angle coverage, while the second lens group uses positive refractive power elements with different material properties (Abbe numbers) to correct chromatic aberration. Each local region of the lens system has optimized quality characteristics suited to its functional requirements.
2Adaptability or versatility
If a wide-angle lens design is used to achieve shorter focal length, then the viewing angle is improved, but field curvature increases significantly
Solution Approach 1:
The lens system is segmented into two functional groups: the first lens group (L1-L3) optimized for wide-angle light reception with negative refractive power, and the second lens group (L4-L6) optimized for field flatness correction with positive refractive power. This segmentation allows independent optimization of viewing angle and field curvature characteristics.
Solution Approach 2:
The patent employs specific parameter relationships to control field curvature. The focal length ratios (|if/fr| between 0.65-8.81, |f1/f2| between 0.52-1.06) and the distance ratio (1CT/2CT between 1.75-2.77) are carefully controlled to balance wide-angle performance with field flatness. The Abbe numbers of different lens elements (V4, V5, V6) are selected to achieve both wide viewing angle and reduced field curvature through precise parameter optimization.
3Adaptability or versatility
If the focal length ratio of the first lens group to the second lens group is increased to achieve wide-angle effect, then the viewing angle is improved, but it becomes difficult to achieve miniature image pickup lens
Solution Approach 1:
The patent defines specific parameter ranges to simultaneously achieve wide-angle effect and compact size. The focal length ratio |if/fr| is constrained between 0.65 and 8.81, and the distance ratio 1CT/2CT is constrained between 1.75 and 2.77. These parameter constraints ensure that the lens module maintains a compact form factor suitable for miniature image pickup applications while preserving wide-angle optical performance.
4Adaptability or versatility
If the focal length ratio of the first lens to the second lens is increased to achieve wide-angle effect, then the viewing angle is improved, but the yield and manufacturing precision become difficult to control
Solution Approach 1:
The patent specifies that the focal length ratio |f1/f2| should be between 0.52 and 1.06 to achieve wide-angle effect while maintaining manufacturability. This parameter range is carefully selected to balance optical performance with manufacturing tolerance requirements, ensuring that small variations in lens fabrication do not significantly degrade the overall system 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 design achieves low chromatic aberration, small field curvature, and inconspicuous stray light, enhancing the overall quality of wide-angle lenses with large-aperture capabilities and suitability for miniature image pickup.
Implementation Method 1
a first lens has a negative refractive power, a second lens has a negative refractive power and a third lens has a positive refractive power... a fourth lens has a positive refractive power, a fifth lens has a negative refractive power, and a sixth lens has a positive refractive power
Data Source
AI summary
A six-piece wide-angle lens module includes, from an object side to an image side, a first lens group, an aperture and a second lens group. The first lens group consists of a negative first lens, a negative second lens and a positive third lens, each lens having an object side surface facing the object side and an image side surface facing the image side, the first lens is a meniscus lens having a convex object side surface, the second lens has a concave image side surface, the third lens has a convex object side surface. The second lens group consists of a positive fourth lens, a negative fifth lens and a positive sixth lens, the fourth lens is a biconvex lens, the fifth lens has a concave image side surface, the sixth lens has a convex object side surface, the second lens group has a positive focal length.