Six-Lens Imaging System with Aspherical Sixth Element
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Solution Overview
Problem
Current imaging lenses for digital devices with high pixel counts, such as those exceeding 5 Mega Pixels, face challenges in achieving reduced overall length while maintaining high image quality across the central and peripheral angles of view, particularly when applied to larger image sensors.
Innovation Solution
A six-lens imaging lens configuration is optimized, comprising a first positive refractive power lens with a convex surface on the object side, a second negative refractive power lens with a concave surface on the image side, a third bi-convex lens, a fourth positive lens, a fifth negative lens with a concave surface on the image side, and a sixth lens with an aspherical shape, arranged to reduce overall length while maintaining high resolution and image quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a relatively large number of lenses (five or six) is employed to reduce overall length and improve resolution, then resolution and compact size are improved, but device complexity increases
Solution Approach 1:
The patent applies parameter changes by optimizing the refractive powers, curvatures, and spacing of each lens element. Specifically, it defines conditional expressions for the focal lengths and refractive indices of the six lenses to achieve high resolution while maintaining compact size. The sixth lens uses an aspherical surface with specific curvature parameters to correct aberrations effectively.
Solution Approach 2:
The patent employs aspherical surfaces, particularly on the sixth lens, to improve optical performance. The aspherical shape allows for better correction of spherical aberration and other optical defects, enabling high resolution imaging with a compact six-lens configuration rather than requiring more lenses.
2Area of stationary object
If the imaging lens is extended proportionally to apply to larger image sensors, then image size compatibility is improved, but overall length becomes long
Solution Approach 1:
The patent uses parameter changes by defining specific conditional expressions for the focal lengths and refractive powers of each lens. This allows the lens system to be scaled for larger image sensors while maintaining a compact overall length through optimized optical parameters rather than simple proportional extension.
Solution Approach 2:
The patent addresses the scaling issue by changing the optical design parameters across different dimensions. Instead of simply scaling the lens size proportionally (one-dimensional approach), it optimizes multiple parameters including focal lengths, refractive indices, and surface curvatures across the entire six-lens system to achieve compact design for larger sensors.
3Length of stationary object
If the overall length is reduced for compact devices, then device compactness is improved, but image quality across peripheral angle of view deteriorates
Solution Approach 1:
The patent employs aspherical surfaces, particularly on the sixth lens, to maintain high image quality across the entire field of view including peripheral regions. The aspherical shape effectively corrects spherical aberration and other optical defects that would otherwise deteriorate image quality in compact lens designs.
Solution Approach 2:
The patent defines specific conditional expressions for the refractive powers and spacing of each lens element to optimize image quality. By carefully controlling parameters such as the focal lengths of the positive and negative lenses and their relative positions, the system achieves high resolution across the central and peripheral angles of view while maintaining reduced overall length.
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 optimized six-lens configuration achieves a balance between reduced overall length and high image quality, effectively addressing the need for improved resolution and compact size in imaging lenses for digital devices with high pixel counts.
Implementation Method 1
a sixth lens having a negative refractive power with the image side surface having an aspherical shape which is concave on the image side near the optical axis and convex in a peripheral region
Data Source
AI summary
An imaging lens substantially consisting of six lenses, composed of a first lens having a positive refractive power and a convex surface on the object side, a second lens having a negative refractive power and a concave surface on the image side, a third lens having a positive refractive power and a convex surface on the object side, a fourth lens having a positive refractive power, a fifth lens having a negative refractive power and a concave surface on the image side, and a sixth lens having a negative refractive power with the image side surface having an aspherical shape which is concave on the image side near the optical axis and convex in a peripheral region.