Compact Five-Element Lens Assembly for High Resolution

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Solution Overview

Problem

Conventional compact optical systems for portable electronic devices, such as smartphones and tablets, fail to meet the demands for high resolution and image quality due to their large size and high cost, particularly in telephoto optical systems with five-element lens structures.

Innovation Solution

A compact image capturing lens assembly comprising five non-cemented lens elements with specific refractive powers and aspheric surfaces, including a first lens element with positive refractive power, a second lens element with negative refractive power, a third lens element with positive refractive power, a fourth lens element with negative refractive power, and a fifth lens element with negative refractive power, optimized to satisfy the relationships between focal lengths, curvature radii, and central thickness for improved image quality and portability.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If a conventional five-element lens structure with glass lens elements and spherical surfaces is used for telephoto optical system, then the image quality and resolution requirements can be met, but the volume becomes excessively large and the price becomes too high

Engineering Contradiction:

Improveimage qualityVSAvoidvolume

Core Design Contradiction:

Measurement precisionVSVolume of moving object

Solution Approach 1:

The patent changes the parameters of the lens elements by using aspheric surfaces instead of spherical surfaces, and by optimizing the refractive powers and curvature radii of each lens element. This allows achieving high image quality with a more compact lens structure, thereby reducing the volume of the telephoto optical system while maintaining measurement precision

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent employs a composite lens structure combining multiple lens elements with different refractive powers and aspheric surfaces. This composite approach allows for better aberration correction and improved image quality in a more compact configuration compared to conventional glass lens elements with spherical surfaces

Inventive Principle:

Principle #40Composite materials

2Measurement precision

Engineering Contradiction:

Improveimage qualityVSAvoidprice

Core Design Contradiction:

Measurement precisionVSEase of manufacture

Solution Approach 1:

The patent optimizes the parameters of the lens elements including aspheric surface coefficients, refractive powers, and curvature radii to achieve high image quality. This parameter optimization allows for the use of more cost-effective materials and manufacturing processes while maintaining the required image quality standards

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent adopts a lens design that can be manufactured with more economical materials and processes compared to conventional high-end glass lens elements. The aspheric surfaces can be molded using plastic or glass, reducing manufacturing costs while achieving the required optical performance

Inventive Principle:

Principle #27Cheap short-living objects (Disposable)

3Quantity of substance

If the pixel size of sensors is reduced to achieve higher megapixels in compact optical systems, then the megapixel count increases, but the image quality and resolution requirements become harder to satisfy

Engineering Contradiction:

ImprovemegapixelsVSAvoidimage quality

Core Design Contradiction:

Quantity of substanceVSMeasurement precision

Solution Approach 1:

The patent changes the optical parameters of the lens system by using aspheric surfaces and optimizing the refractive power distribution among the five lens elements. This allows for better control of light rays from each pixel, reducing optical aberrations and improving image quality even when using sensors with reduced pixel size for higher megapixel counts

Inventive Principle:

Principle #35Parameter changes

4Volume of moving object

If a compact optical system is designed for portable electronic devices, then the portability is improved, but the image quality and resolution fail to meet the demands for high resolution

Engineering Contradiction:

ImprovesizeVSAvoidimage quality

Core Design Contradiction:

Volume of moving objectVSMeasurement precision

Solution Approach 1:

The patent optimizes the parameters of each lens element including curvature radii, thickness, and refractive powers to achieve a compact overall size. The aspheric surfaces allow for better aberration correction in a reduced form factor, maintaining high image quality while improving portability for mobile terminals

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent uses a composite lens structure with five elements having different refractive powers and aspheric surfaces. This composite design enables effective aberration correction and high image quality in a compact configuration suitable for portable electronic devices

Inventive Principle:

Principle #40Composite materials

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

The solution provides a compact and cost-effective image capturing lens assembly that enhances image quality, reduces aberrations, and maintains a portable size, while allowing for better light deflection and chromatic aberration correction, thus addressing the limitations of conventional systems.