Five-Lens Imaging System for Wide Angle and Compact Length
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Solution Overview
Problem
Existing imaging lenses for devices like smartphones and tablets face challenges in achieving a wider angle of view while maintaining a shorter total length and high imaging performance from central to peripheral angles, as previous lens systems struggle to balance these demands effectively.
Innovation Solution
A five-lens imaging lens configuration with specific refractive powers and surface shapes, including a first lens with positive power, a biconcave second lens, a meniscus third lens, a biconcave fourth lens, and a concave fifth lens, optimized to satisfy conditional formulae that enhance optical performance and reduce overall length.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If the lens system uses a five-lens configuration with conventional designs, then the imaging performance is maintained, but the total length cannot be sufficiently shortened and the angle of view cannot be widened
Solution Approach 1:
The patent applies parameter changes by optimizing the refractive powers, curvatures, and spacing of the five lens elements to satisfy specific conditional formulas. This allows the lens system to achieve a shorter total length while maintaining a wide angle of view, resolving the contradiction between compact size and optical performance
Solution Approach 2:
The patent uses composite lens design combining different lens materials with varying refractive indices and dispersion characteristics. This enables better control of optical paths and aberrations, allowing the system to achieve both short length and wide angle of view with high imaging quality
2Adaptability or versatility
If the lens system is designed for wider angle of view, then the angle of view is improved, but the total length increases and imaging performance at peripheral angles deteriorates
Solution Approach 1:
The patent applies local quality by designing each lens element with specific surface shapes (convex, concave, meniscus) and refractive powers tailored to their positions in the optical system. This localized optimization allows the system to achieve wide angle of view while controlling the total length and maintaining imaging quality across the entire field
Solution Approach 2:
The patent divides the optical system into five distinct lens elements with different functions. The first lens (positive power) handles initial light convergence, while subsequent lenses (negative and positive powers) correct aberrations and control the optical path. This segmentation allows independent optimization of each element to achieve wide angle of view without increasing total length
3Length of moving object
If the lens system is designed for shorter total length, then the device size is reduced, but the angle of view narrows and imaging performance at peripheral angles decreases
Solution Approach 1:
The patent employs composite lens design with multiple elements having different refractive indices and Abbe numbers. This allows sophisticated correction of chromatic and spherical aberrations, maintaining high imaging quality from central to peripheral angles even in the compact lens configuration
Solution Approach 2:
The patent optimizes specific parameters including the ratio of focal lengths (f/f4, f/f5), curvature radii, and spacing between elements to satisfy conditional formulas. These parameter adjustments enable the compact design to achieve wide angle of view with high imaging performance across the entire field
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 wider angle of view, shorter total length, and high imaging performance across all angles, compatible with increased pixel counts, enabling high-resolution images and reduced device size.
Implementation Method 1
a first lens having a positive refractive power and a convex surface toward the object side; a second lens of a biconcave shape; a third lens having a positive refractive power and is of a meniscus shape with a concave surface toward the object side; a fourth lens having a negative refractive power and a concave surface toward the object side; and a fifth lens having a negative refractive power and a concave surface toward the image side
Data Source
AI summary
An imaging lens is essentially constituted by five lenses, including: a first lens having a positive refractive power and a convex surface toward the object side; a second lens of a biconcave shape; a third lens having a positive refractive power and is of a meniscus shape with a concave surface toward the object side; a fourth lens having a negative refractive power and a concave surface toward the object side; and a fifth lens having a negative refractive power and a concave surface toward the image side, provided in this order from the object side. The imaging lens satisfies predetermined conditional formulae.