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

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

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 five or six lenses are too large and cumbersome.

Innovation Solution

The imaging lens is configured with five lenses, including a first lens with positive refractive power and a meniscus shape concave toward the image side, a second lens with negative refractive power and a meniscus shape concave toward the image side, a third lens with a biconcave shape, a fourth lens with positive refractive power and a meniscus shape convex toward the image side, and a fifth lens with a biconcave and aspheric shape, optimized to satisfy specific focal length ratios and surface configurations to reduce overall length while maintaining high resolution.

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 focal length ratios between lens elements (specifically setting -2.127 < f/f5 < -0.5 where f is the focal length of the whole system and f5 is the focal length of the fifth lens) and configuring specific meniscus shapes and aspheric surfaces to reduce the total length while maintaining high imaging performance with five lenses

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent utilizes aspheric surfaces on the fifth lens and specific curved surface configurations (meniscus shapes on first, second, and fourth lenses) to control light paths more efficiently, reducing the overall lens length while maintaining high resolution performance across the angle of view

Inventive Principle:

Principle #14Spheroidality (Curvature)

2Measurement precision

If the number of lenses is increased to five or six 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 key optical parameters including setting the fifth lens with a specific focal length ratio (f/f5 between -2.127 and -0.5) and configuring aspheric surfaces to achieve high 8 megapixel or higher resolution performance while minimizing the lens volume for compact device integration

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent divides the optical system into five distinct lens elements with specific refractive power distributions (positive, negative, biconcave, positive, biconcave aspheric) to achieve high resolution performance while controlling overall size, rather than using fewer or more lenses

Inventive Principle:

Principle #1Segmentation

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 allows for high resolution performance from the central to peripheral angles of view while significantly reducing the total length of the lens system, enhancing imaging quality and compactness in mobile devices.

Implementation Method 1

a first lens that has a positive refractive power and has a meniscus shape which is concave toward an image side

Methodology Applied