Imaging Lens Profile Reduction and Aberration Correction

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Solution Overview

Problem

Conventional imaging lenses face difficulties in achieving high resolution with a low profile and low F-number while effectively correcting aberrations, particularly in the peripheral area.

Innovation Solution

The imaging lens configuration includes a specific arrangement of lenses with varying refractive powers and surface curvatures, along with conditional expressions that define optimal relationships between lens parameters, such as refractive indices and curvature radii, to balance profile reduction and aberration correction.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Length of stationary object

If the first lens strengthens refractive power to reduce profile, then the profile is reduced, but spherical aberration and distortion increase

Engineering Contradiction:

ImproveprofileVSAvoidspherical aberration and distortion

Core Design Contradiction:

Length of stationary objectVSManufacturing precision

Solution Approach 1:

The first lens uses an aspheric surface on its object-side surface to provide different curvature characteristics in different regions. The aspheric shape allows the lens to maintain strong refractive power for profile reduction while locally correcting spherical aberration and distortion through the varied surface curvature from center to edge.

Inventive Principle:

Principle #3Local quality

2Device complexity

If conventional lens configurations are used, then the structure is simple, but aberrations in peripheral area cannot be corrected

Engineering Contradiction:

Improvelens configurationVSAvoidaberration correction

Core Design Contradiction:

Device complexityVSManufacturing precision

Solution Approach 1:

The imaging lens is divided into five distinct lens elements with specific refractive power assignments and surface curvature characteristics. This segmentation allows each lens to address specific aberration types while collectively achieving comprehensive aberration correction across the entire field of view, including peripheral areas.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent employs aspheric surfaces on specific lens elements (first lens object-side surface, second lens object-side surface, third lens image-side surface, fifth lens object-side surface) to correct aberrations. The aspheric curvature profiles enable precise control of light ray paths, particularly for off-axis rays, thereby correcting coma, astigmatism, and distortion that spherical surfaces cannot address.

Inventive Principle:

Principle #14Spheroidality (Curvature)

3Illumination intensity

If low F-number is achieved, then light gathering capability is improved, but aberration correction becomes more difficult

Engineering Contradiction:

Improvelight gathering capabilityVSAvoidaberration correction

Core Design Contradiction:

Illumination intensityVSManufacturing precision

Solution Approach 1:

The patent optimizes multiple parameters including the refractive powers of individual lenses, the curvature radii of aspheric surfaces, the axial positions of each lens element, and the spacing between lenses. These parameter adjustments enable the system to maintain low F-number for improved light gathering while achieving comprehensive aberration correction through coordinated optimization of all optical parameters.

Inventive Principle:

Principle #35Parameter changes

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 results in an imaging lens that achieves high resolution, balances low profile and low F-number requirements, and effectively corrects aberrations like spherical aberration, chromatic aberration, astigmatism, and distortion.

Implementation Method 1

a first lens with positive refractive power having an object-side surface being convex in a paraxial region

Methodology Applied