Five-Lens Imaging System for Compact Wide-Angle Aberration Correction

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Solution Overview

Problem

Conventional imaging lenses for compact devices struggle to achieve a balance between low-profile design, low F-value, and wide field of view while effectively correcting aberrations, particularly in the peripheral area.

Innovation Solution

The proposed imaging lens configuration consists of five lenses with specific refractive powers and surface shapes, including a first lens with positive refractive power, a second lens with negative refractive power, a third lens with the smallest positive refractive power, a fourth lens with large positive refractive power, and a fifth lens as a double-sided aspheric lens, optimized by conditional expressions to ensure low-profile, wide field of view, and proper aberration correction.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If the field of view is increased to meet wide-angle requirements, then the imaging lens can capture broader scenes, but aberration correction in the peripheral area becomes insufficient

Engineering Contradiction:

Improvefield of viewVSAvoidaberration correction

Core Design Contradiction:

Adaptability or versatilityVSManufacturing precision

Solution Approach 1:

The imaging lens is divided into five distinct lens elements with different refractive powers and surface shapes. Each lens element (L1-L5) is optimized to handle specific aberration correction tasks, allowing the system to maintain high precision across the entire field of view including peripheral areas while achieving wide-angle capability.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Different lens elements are assigned specific functions based on their local optical properties. For example, the aspheric surfaces on L3 and L5 are specifically designed to correct peripheral aberrations, while other elements focus on overall focal length and brightness control. This localized optimization enables simultaneous achievement of wide field of view and high aberration correction.

Inventive Principle:

Principle #3Local quality

2Illumination intensity

If the lens system is made brighter with lower F-value, then more light is captured for high-quality imaging, but maintaining low-profile design and wide field of view becomes difficult

Engineering Contradiction:

Improvebrightness (F-value)VSAvoidtotal track length

Core Design Contradiction:

Illumination intensityVSLength of stationary object

Solution Approach 1:

Aspheric surfaces are introduced on lens elements L3 and L5 to replace traditional spherical surfaces. This allows for more efficient light path control, enabling the system to achieve F2.4 brightness while maintaining a compact total track length of 4.58mm and wide field of view of 78 degrees, as the aspheric shapes optimize light convergence without requiring additional axial space.

Inventive Principle:

Principle #14Spheroidality (Curvature)

3Length of stationary object

If the total track length is reduced for compact device integration, then the imaging lens becomes more suitable for mobile phones and portable devices, but aberration correction performance deteriorates

Engineering Contradiction:

Improvetotal track lengthVSAvoidaberration correction

Core Design Contradiction:

Length of stationary objectVSManufacturing precision

Solution Approach 1:

The aspheric surfaces on L3 and L5 enable effective aberration correction within a shortened total track length of 4.58mm. The aspheric shapes provide additional degrees of freedom for optimizing light path control, allowing the compact design to maintain high imaging performance including effective correction of spherical aberration, coma, and astigmatism despite the reduced overall length.

Inventive Principle:

Principle #14Spheroidality (Curvature)

Solution Approach 2:

The patent optimizes specific parameter relationships to achieve compact size with maintained performance. For example, the conditional expression 0.3 < f1/|f2| ensures proper balance between the positive and negative lens elements, and the aspheric coefficients are carefully tuned to correct aberrations within the constrained total track length, demonstrating parameter optimization for compact high-performance design.

Inventive Principle:

Principle #35Parameter changes

4Adaptability or versatility

If five lens elements are used to achieve low-profile and wide field of view, then optical performance is improved, but device complexity increases

Engineering Contradiction:

Improveoptical performanceVSAvoidnumber of lens elements

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

Multiple optical functions are integrated into the five-lens configuration. The system combines wide-angle capability, low F2.4 brightness, and effective aberration correction in a unified design. By carefully selecting the refractive powers and surface shapes of each element, the patent merges multiple performance requirements into a single optimized system rather than requiring separate solutions for each function.

Inventive Principle:

Principle #5Merging (Combining)

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 results in a compact imaging lens with a total track length less than 5 mm, F-value of 2.4 or less, and a field of view of 70 degrees or more, effectively correcting spherical aberration, coma aberration, astigmatism, and field curvature, ensuring high-resolution images.