Five-Lens Imaging System with Aspheric Fifth Element for Compact High-Resolution Design

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Solution Overview

Problem

There is a demand for imaging lenses that can achieve high imaging performance across a wide angle of view while minimizing the total length, particularly in compact devices like cellular phones and smartphones, where existing lenses composed of multiple elements are too large.

Innovation Solution

The proposed imaging lens configuration consists of five lenses, including a biconvex first lens, a negative second lens, a meniscus-shaped third lens, a positive fourth lens, and a concave aspheric fifth lens, optimized to satisfy specific focal length ratios and refractive power conditions, allowing for high resolution performance while reducing the overall lens length.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If the imaging lens is composed of five or six lenses to achieve high resolution performance, then the imaging performance is improved, but the total length of the lens increases

Engineering Contradiction:

Improveimaging performanceVSAvoidtotal length of lens

Core Design Contradiction:

Measurement precisionVSLength of stationary object

Solution Approach 1:

The patent applies parameter changes by optimizing the refractive indices and Abbe numbers of the lens materials. Specifically, it sets the refractive index of the third lens between 1.63 and 1.75, and the Abbe number between 20 and 40, which allows achieving high imaging performance with a reduced total length by changing the optical parameters of the materials used

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent employs asymmetric lens designs, particularly with the fourth lens having different radii of curvature for its object-side surface (R4f) and image-side surface (R4r), and the fifth lens being asymmetric with an extreme point on its image-side surface. This asymmetry allows for compacting the lens structure while maintaining high resolution performance

Inventive Principle:

Principle #4Asymmetry

2Measurement precision

If the number of lenses is increased to 5 or 6 to satisfy high resolution demands, then the resolution performance is improved, but the device size increases

Engineering Contradiction:

Improveresolution performanceVSAvoiddevice size

Core Design Contradiction:

Measurement precisionVSVolume of moving object

Solution Approach 1:

The patent changes the optical parameters by specifying precise ranges for refractive indices (e.g., fourth lens: 1.58-1.68, fifth lens: 1.63-1.75) and Abbe numbers, which enables achieving 8 megapixels or higher resolution performance while keeping the lens system compact and the device size reduced

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent utilizes aspheric surfaces, particularly on the fifth lens which has an extreme point on its image-side surface. This curved surface design allows for better light control and higher resolution performance in a more compact configuration, reducing the overall device volume

Inventive Principle:

Principle #14Spheroidality (Curvature)

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 performance from the central to peripheral angles of view while significantly decreasing the total lens length, enhancing the imaging capabilities of compact devices without increasing their size.