Five-Element Imaging Lens with Inflection Points for Compact High Resolution

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Solution Overview

Problem

There is a demand for imaging lenses that can achieve high imaging performance while minimizing the total length, particularly in compact devices like cellular phones and smartphones, where existing lenses composed of five or six elements are too large and inefficient in terms of resolution and peripheral view coverage.

Innovation Solution

The proposed imaging lens system consists of five lenses with specific refractive powers and shapes, including a first lens with positive refractive power and a meniscus shape convex toward the object side, a second lens with negative refractive power and a concave shape toward the image side, a third lens with a meniscus shape convex toward the image side, a fourth lens with positive refractive power, and a fifth lens with negative refractive power and at least one inflection point on the image side surface, optimized to satisfy specific conditional expressions for focal lengths and radii of curvature.

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

Core Design Contradiction:

Measurement precisionVSLength of moving object

Solution Approach 1:

The patent applies parameter changes by optimizing the refractive powers, focal lengths, and curvature radii of the five lens elements to satisfy specific conditional expressions. This allows achieving high imaging performance with only five lenses instead of six or more, thereby reducing total length while maintaining resolution quality

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent segments the imaging lens into five specific lens elements with defined refractive powers and shapes. By carefully designing each segment's optical properties and their relative positions, the system achieves high performance with minimized total length, avoiding the need for additional lens elements

Inventive Principle:

Principle #1Segmentation

2Length of moving object

If the number of lenses is reduced to decrease total length, then the lens size is reduced, but the imaging performance deteriorates

Engineering Contradiction:

Improvetotal lengthVSAvoidimaging performance

Core Design Contradiction:

Length of moving objectVSMeasurement precision

Solution Approach 1:

The patent compensates for the reduced number of lenses by optimizing the optical parameters of each element. The conditional expressions define specific ranges for refractive powers and focal lengths that ensure high imaging performance is maintained even with only five lenses, preventing performance deterioration

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

Each lens element is designed with specific local optical properties (refractive power, shape, focal length) that are optimized for its position in the sequence. This local optimization ensures that the collective five-element system achieves high overall performance without needing additional elements

Inventive Principle:

Principle #3Local quality

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 across the central and peripheral angles of view while significantly reducing the total lens length, enhancing the imaging capabilities of compact devices without compromising optical performance.

Implementation Method 1

a first lens that has a positive refractive power and has a meniscus shape which is convex toward the object side

Methodology Applied