Imaging Lens Aberration Correction via Refractive Power Segmentation

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Solution Overview

Problem

Conventional imaging lenses struggle to achieve a wide field of view, low profile, and low F-number while effectively correcting aberrations, particularly in compact imaging devices like smartphones and monitoring cameras.

Innovation Solution

The imaging lens configuration consists of a series of lenses with specific refractive powers and shapes, including a first lens with negative refractive power, a second lens with negative refractive power, a third lens with positive refractive power, a fourth lens with positive refractive power, and a fifth lens with negative refractive power, optimized by conditional expressions to achieve a balance of wide field of view, low profile, and aberration correction.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Area of stationary object

If conventional lens configurations are used to achieve wide field of view and low F-number, then the field of view and brightness are improved, but aberration correction at peripheral area deteriorates

Engineering Contradiction:

Improvefield of viewVSAvoidaberration correction

Core Design Contradiction:

Area of stationary objectVSManufacturing precision

Solution Approach 1:

The lens system is divided into five distinct lens elements with specific refractive power distributions. The first lens has negative refractive power for wide field of view, the second lens has positive refractive power for aberration correction, the third lens has negative refractive power, the fourth lens has positive refractive power, and the fifth lens has negative refractive power. This segmentation allows each element to contribute specifically to either field of view expansion or aberration correction.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Different regions of the lens system are optimized for different functions. The first lens element focuses on providing wide field of view with negative refractive power, while the second lens element specifically addresses peripheral aberration correction with positive refractive power. The subsequent elements (third through fifth) are configured with alternating refractive powers to locally correct specific types of aberrations in different parts of the optical path.

Inventive Principle:

Principle #3Local quality

2Reliability

If lens configuration is optimized for wide field of view and low F-number, then optical performance is improved, but lens profile and compactness deteriorate

Engineering Contradiction:

Improveoptical performanceVSAvoidlens profile

Core Design Contradiction:

ReliabilityVSLength of stationary object

Solution Approach 1:

The lens system employs dynamic optimization of the spacing between lens elements. The second conditional expression specifies that 0.3 < f2/f < 0.5, where f2 is the focal length of the second lens and f is the focal length of the entire lens system. This dynamic ratio control allows the system to maintain compact profile while achieving wide field of view and low F-number through optimized optical path management.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The invention changes key optical parameters including the refractive powers of individual lens elements and the spacing ratios between them. The third conditional expression 0.1 < T2/T3 < 0.5 controls the ratio of the air gap after the second lens (T2) to the air gap after the third lens (T3), enabling compact configuration while maintaining optical performance. These parameter changes allow the lens to achieve wide field of view without proportionally increasing overall size.

Inventive Principle:

Principle #35Parameter changes

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 enables high-resolution imaging with excellent aberration correction, meeting the demands of wide field of view, low profile, and low F-number, while maintaining high optical performance in compact devices.