Five-Element Optical Imaging Lens Assembly for Compact Wide-Angle Design

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Solution Overview

Problem

Conventional optical systems in portable electronic devices fail to simultaneously achieve high image quality, wide field of view, and compact size due to limitations in lens element arrangement and refractive power distribution.

Innovation Solution

An optical imaging lens assembly comprising five non-cemented lens elements with specific refractive powers and surface curvatures, including a first lens with negative power, a second with positive power, a third and fourth with negative power, and a fifth with positive power, arranged with air gaps between them, optimizing refractive power distribution and surface shapes to correct aberrations and maintain a compact design.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Volume of moving object

If conventional lens structures with fewer lens elements are used, then the device size is reduced, but image quality and field of view cannot be improved

Engineering Contradiction:

Improvedevice sizeVSAvoidimage quality

Core Design Contradiction:

Volume of moving objectVSManufacturing precision

Solution Approach 1:

The optical system is divided into five separate lens elements with air gaps between them, allowing each element to be optimized independently for specific aberration corrections while maintaining a compact overall structure. This segmentation enables achieving high image quality without increasing device volume excessively.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Different regions of the lens elements have different surface curvatures and refractive powers tailored to correct specific aberrations in different field regions. The aspheric surfaces provide locally optimized light control to achieve wide field of view with high image quality across the entire image sensor.

Inventive Principle:

Principle #3Local quality

2Adaptability or versatility

If lens elements are arranged to achieve wide field of view, then field of view is improved, but device size increases and image quality deteriorates

Engineering Contradiction:

Improvefield of viewVSAvoiddevice size

Core Design Contradiction:

Adaptability or versatilityVSVolume of moving object

Solution Approach 1:

Aspheric surfaces are employed on multiple lens elements to provide curved light paths that enable wide field of view without requiring large axial distances. The varying curvature across the lens surfaces allows compact arrangement while capturing light from wide angles and focusing it properly on the image sensor.

Inventive Principle:

Principle #14Spheroidality (Curvature)

Solution Approach 2:

The patent utilizes the axial dimension efficiently by positioning air gaps at specific distances between lens elements, creating a compact three-dimensional arrangement that achieves wide field of view without increasing the lateral footprint or overall device volume.

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

3Adaptability or versatility

If lens elements are arranged to achieve wide field of view, then field of view is improved, but image quality cannot be maintained

Engineering Contradiction:

Improvefield of viewVSAvoidimage quality

Core Design Contradiction:

Adaptability or versatilityVSManufacturing precision

Solution Approach 1:

Each lens element is designed with specific surface curvatures and refractive powers tailored to correct aberrations in particular field regions. The aspheric surfaces provide locally optimized light control to achieve wide field of view with high image quality across the entire image sensor.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The patent employs aspheric surfaces with varying curvature parameters across different lens elements to correct optical aberrations. By changing the surface parameters from simple spherical to complex aspheric profiles, the system achieves wide field of view while maintaining sharp focus and correcting chromatic and monochromatic aberrations.

Inventive Principle:

Principle #35Parameter changes

4Ease of manufacture

If cemented lens structures are used, then manufacturing is simplified, but molding issues and imbalanced refractive power distribution occur

Engineering Contradiction:

Improvemanufacturing simplicityVSAvoidmolding quality

Core Design Contradiction:

Ease of manufactureVSReliability

Solution Approach 1:

The optical system uses five separate uncemented lens elements with air gaps between them, allowing each element to be molded and assembled independently. This avoids the molding difficulties of cemented structures while enabling precise control of refractive power distribution through independent optimization of each element.

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

The solution enables the optical imaging lens assembly to achieve a wide field of view, high image quality, and compact size while preventing molding issues and imbalanced refractive power distribution, effectively correcting chromatic aberration and astigmatism.

Implementation Method 1

The first lens element with negative refractive power has an image-side surface being concave in a paraxial region

Methodology Applied