Six-Element Imaging Lens Compact Design Wide Angle

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Solution Overview

Problem

Current imaging lenses for devices like smartphones and tablets face challenges in reducing overall lens length while increasing angle of view, while being compatible with higher pixel count image sensors.

Innovation Solution

A six-element imaging lens configuration with specific refractive power and shape arrangements, including a first lens with a positive meniscus shape, a second lens with negative power and biconcave shape, a third and fourth lens with positive power, a fifth lens with negative power and biconcave shape, and a sixth lens with negative power and meniscus shape on the image side, optimized by conditional expressions for refractive powers and radii of curvature.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Manufacturing precision

If the number of lens elements is increased to improve optical performance and compatibility with high pixel count sensors, then imaging quality is improved, but overall lens length increases

Engineering Contradiction:

Improveimaging qualityVSAvoidoverall lens length

Core Design Contradiction:

Manufacturing precisionVSLength of stationary object

Solution Approach 1:

The patent applies parameter changes by carefully controlling the refractive powers, radii of curvature, and axial positions of each lens element. Specific conditional expressions define the relationships between these parameters to achieve compact dimensions while maintaining high imaging quality compatible with 8-megapixel or higher sensors

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The six-element lens design achieves multi-functionality by simultaneously correcting various optical aberrations (spherical, coma, astigmatism, field curvature, distortion, and chromatic aberrations) while maintaining a compact form factor, making it suitable for diverse mobile imaging applications

Inventive Principle:

Principle #6Universality (Multi-functionality)

2Area of stationary object

If the angle of view is increased to capture wider scenes, then imaging coverage is improved, but optical aberrations increase

Engineering Contradiction:

Improveimaging coverageVSAvoidoptical aberrations

Core Design Contradiction:

Area of stationary objectVSObject-affected harmful factors

Solution Approach 1:

The patent applies local quality by assigning specific shape characteristics to different lens elements: the first lens has a meniscus shape with the convex surface facing the object side, the fifth lens has a biconcave shape, and the sixth lens has a meniscus shape with the concave surface facing the image side. These localized shape optimizations effectively control off-axis ray paths to reduce coma and astigmatism while maintaining a wide angle of view of 70 degrees or more

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The patent uses composite material principles by combining lens elements with different refractive indices and Abbe numbers. Specifically, the third lens has a higher refractive index than the fourth lens, and the fifth lens has a higher Abbe number than the sixth lens, creating a composite optical system that effectively corrects chromatic aberrations while maintaining wide-angle performance

Inventive Principle:

Principle #40Composite materials

3Length of stationary object

If the overall lens length is reduced for device thinning, then device portability is improved, but angle of view decreases

Engineering Contradiction:

Improveoverall lens lengthVSAvoidangle of view

Core Design Contradiction:

Length of stationary objectVSArea of stationary object

Solution Approach 1:

The patent applies inversion principles by reversing the conventional arrangement of positive and negative lens groups. The first lens has positive refractive power with a meniscus shape convex toward the object, while the fifth lens has negative refractive power with a biconcave shape. This inverted configuration allows the rear focal point to be positioned closer to the lens, achieving a compact overall length while maintaining a wide angle of view through the strategic use of negative power elements toward the image side

Inventive Principle:

Principle #13The other way round (Inversion)

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 achieves a reduced overall lens length and increased angle of view, enabling high-resolution imaging compatible with higher pixel count image sensors, while minimizing aberrations and optimizing optical performance.

Implementation Method 1

a first lens having a positive refractive power and a meniscus shape with a convex surface on the object side

Methodology Applied