Six-Lens Imaging System Aberration Correction
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Solution Overview
Problem
Existing imaging lenses for small cameras, such as smartphones and digital still cameras, face challenges in achieving both downsizing and satisfactory aberration correction, particularly in correcting chromatic and spherical aberrations while maintaining a wide angle of view and high resolution.
Innovation Solution
The imaging lens configuration consists of six lenses with specific refractive powers and curvature radii, including a first positive lens, a second negative lens, a third positive lens, a fourth negative lens, a fifth negative lens, and a sixth lens with an aspheric shape near the periphery, which satisfies conditional expressions to correct axial and off-axis chromatic aberrations, and includes two lenses made from high-dispersion materials to restrain chromatic aberrations effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a six-lens configuration is used to correct aberrations, then aberration correction is improved, but device size increases
Solution Approach 1:
The patent combines multiple lens functions into a compact six-lens configuration where each lens contributes specific refractive power. The first lens (positive) and second lens (negative) work together to correct chromatic aberration, while the third through sixth lenses provide additional correction for spherical aberration and distortion. This merged configuration achieves comprehensive aberration correction without requiring a larger number of separate lens components.
Solution Approach 2:
The patent employs conditional expressions that precisely control the curvature radii and refractive indices of each lens. By optimizing parameters such as the curvature radius ratios (e.g., r1/r2, r3/r4) and selecting specific glass materials with appropriate dispersive properties, the system achieves effective aberration correction within a compact form factor. The aspheric shape of the sixth lens further refines these parameter optimizations to reduce spherical aberration.
2Reliability
If the distance from object-side surface to image plane is increased to correct aberrations, then aberration correction is improved, but device size increases
Solution Approach 1:
The patent creates a dynamic balance in the optical path by strategically positioning lenses with different refractive powers at specific intervals. The alternating positive and negative lens configuration allows the system to correct aberrations through the interaction of light paths rather than requiring a longer overall distance. The aspheric sixth lens provides additional dynamic correction capability within the compact space.
Solution Approach 2:
The patent utilizes curved surfaces with optimized curvature radii to achieve aberration correction. The first lens has a convex object-side surface and concave image plane-side surface, while the second lens has both surfaces convex, and so on. These specific curvature configurations enable effective correction of chromatic and spherical aberrations within a short optical path by leveraging the geometric properties of the lens surfaces rather than increasing the overall length.
3Measurement precision
If high-resolution lens configuration is used for advanced users, then image quality is improved, but device size increases
Solution Approach 1:
The patent employs a composite lens system using different glass materials with varying refractive indices and dispersive properties. The first lens uses a material with higher refractive index for strong positive refractive power, while the second lens uses a material with lower refractive index for negative refractive power. This composite material approach enables precise control over chromatic aberration correction and image quality enhancement within a compact configuration, achieving high-resolution performance without proportionally increasing device size.
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
This configuration allows for a compact imaging lens with improved aberration correction, suitable for small cameras, achieving a wide angle of view and high resolution while controlling costs and maintaining image-forming performance.
Implementation Method 1
an imaging lens includes a first lens having positive refractive power; a second lens having negative refractive power; a third lens having positive refractive power; a fourth lens having positive refractive power; a fifth lens having negative refractive power; and a sixth lens having negative refractive power
Implementation Method 2
the sixth lens is formed in a shape so as to have negative refractive power near an optical axis and have strong positive refractive power as it is close to the lens periphery, and has an aspheric image plane-side surface having an inflexion point
Data Source
AI summary
An imaging lens includes a first lens having positive refractive power; a second lens; a third lens; a fourth lens; a fifth lens having negative refractive power; and a sixth lens. The first lens is formed in a shape so that a surface thereof on the object side and a surface thereof on the image plane side have positive curvature radii. The fifth lens is formed in a shape so that a surface thereof on the image plane side has a negative curvature radius. The sixth lens is formed in a shape so that a surface thereof on the image plane side has a positive curvature radius.