Five-Lens Imaging System for Wide Angle and Astigmatism Correction
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Solution Overview
Problem
Existing imaging lenses for thin devices like smartphones and tablets have a narrow angle of view and insufficient astigmatism correction, making them unsuitable for high-resolution image sensors.
Innovation Solution
A five-lens imaging lens configuration with specific refractive powers and shapes, including a first lens with positive power and a meniscus shape, a second lens with negative power and a meniscus shape, a third lens with positive power and a meniscus shape, a fourth lens with positive power and a meniscus shape, and a fifth lens with negative power and a biconcave shape, optimized to achieve a wide angle of view and high imaging performance across the entire image sensor.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a five-lens configuration is used to achieve high resolution, then imaging performance is improved, but the angle of view becomes narrow
Solution Approach 1:
The patent applies parameter changes by optimizing the refractive powers, curvatures, and spacing of the five lens elements. Specifically, it sets the focal length ratios (f1/f, f2/f, f3/f, f4/f, f5/f) and curvature radii (r1, r2, r3, r4, r5, r6, r7, r8, r9, r10) within specific ranges to achieve both wide angle of view and high imaging performance simultaneously
2Measurement precision
If a five-lens configuration is used to achieve high resolution, then imaging performance is improved, but astigmatism correction becomes insufficient
Solution Approach 1:
The patent applies local quality by giving each lens element specific characteristics tailored to its position in the optical system. The first lens has positive refractive power with specific curvature, the second and fifth lenses have negative refractive power, while the third and fourth have positive refractive power. Each lens's curvature radii and thickness are optimized to correct astigmatism at different field positions, ensuring uniform astigmatism correction across the entire image sensor
Solution Approach 2:
The patent uses composite material principles by combining five different lens elements with varying refractive powers and curvature characteristics. This composite lens system integrates diverse optical properties to achieve comprehensive aberration correction, particularly astigmatism, across the wide angle of view and high-resolution image sensor
3Measurement precision
If lens elements are increased to meet high pixel density demands, then resolution is improved, but device thickness increases
Solution Approach 1:
The patent applies parameter changes by optimizing the focal length ratios and curvature radii to achieve compact lens design. By setting specific ranges for f1/f (0.2-0.4), f2/f (-0.3 to -0.5), and other parameters, the system achieves high resolution with reduced overall length suitable for thin devices
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 provides a wide angle of view and high imaging performance from central to peripheral angles, enabling high-resolution image capture with improved astigmatism correction and reduced lens length.
Implementation Method 1
an imaging lens substantially consisting of five lenses consisting of, in order from an object side: a first lens (L1) having a positive refractive power with a convex surface toward the object side; a second lens (L2) having a negative refractive power and having a meniscus shape with a convex surface toward the image side; a third lens (L3) having a positive refractive power and having a meniscus shape with a convex surface toward the image side; a fourth lens (L4) having a positive refractive power and having a meniscus shape with a convex surface toward the image side; and a fifth lens (L5) having a negative refractive power
Data Source
AI summary
An imaging lens substantially consists of five lenses consisting of, in order from the object side: a first lens having a positive refractive power with a convex surface toward the object side; a second lens having a negative refractive power and having a meniscus shape with a convex surface toward the image side; a third lens having a positive refractive power and having a meniscus shape with a convex surface toward the image side; a fourth lens having a positive refractive power and having a meniscus shape with a convex surface toward the image side; and a fifth lens having a negative refractive power, wherein an image-side surface of the fifth lens includes a concave surface and at least one inflection point, wherein a predetermined conditional expression is satisfied.