Six-Lens Imaging System for Wide Field of View and Low Profile

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Solution Overview

Problem

Conventional imaging lenses face difficulties in achieving a wide field of view, low-profileness, and low F-number while effectively correcting aberrations, particularly in the peripheral areas.

Innovation Solution

The imaging lens configuration includes a specific arrangement of lenses with varying refractive powers and surface shapes, such as positive and negative refractive powers, convex and concave surfaces, and aspheric surfaces, optimized by conditional expressions to balance wide field of view, low-profileness, and aberration correction.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Shape

If the refractive power of the first lens is strengthened to achieve wide field of view and low-profileness, then the field of view widens and the lens profile becomes lower, but aberration correction becomes difficult

Engineering Contradiction:

Improvefield of viewVSAvoidaberration correction

Core Design Contradiction:

ShapeVSManufacturing precision

Solution Approach 1:

The imaging lens is divided into six lens elements with different refractive powers and surface shapes. The first lens has positive refractive power with convex surface, the second lens has negative refractive power, the third lens has positive refractive power, the fourth lens has refractive power, the fifth lens has negative refractive power, and the sixth lens has positive refractive power with meniscus shape. This segmentation allows each lens element to contribute to both the wide field of view and aberration correction.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Different lens elements have different local optical properties tailored to specific correction needs. The first lens with positive refractive power and convex surface addresses the field of view requirement, while subsequent lenses with varying refractive powers and aspheric surfaces provide localized aberration correction in different regions of the optical path.

Inventive Principle:

Principle #3Local quality

2Length of stationary object

If the imaging lens is designed with low-profileness to reduce device size, then the device becomes more compact, but aberration correction at peripheral areas deteriorates

Engineering Contradiction:

Improvelens profileVSAvoidaberration correction

Core Design Contradiction:

Length of stationary objectVSManufacturing precision

Solution Approach 1:

The imaging lens employs aspheric surfaces on multiple lens elements to maintain compact profile while correcting aberrations. The aspheric shapes allow for better control of light rays at peripheral areas without increasing the overall lens profile, thus achieving both compactness and excellent aberration correction.

Inventive Principle:

Principle #14Spheroidality (Curvature)

Solution Approach 2:

Each lens element serves multiple functions: the first lens provides positive refractive power for wide field of view, the second lens with negative power corrects spherical aberration, the third lens corrects coma and astigmatism, the fourth lens maintains low profile while correcting astigmatism and field curvature, the fifth lens corrects chromatic aberration, and the sixth lens provides final aberration correction. This multi-functionality allows compact design without sacrificing correction quality.

Inventive Principle:

Principle #6Universality (Multi-functionality)

3Illumination intensity

If the F-number is reduced to improve light gathering capability, then the imaging performance in low light improves, but aberration correction becomes more difficult

Engineering Contradiction:

Improvelight gathering capabilityVSAvoidaberration correction

Core Design Contradiction:

Illumination intensityVSManufacturing precision

Solution Approach 1:

The imaging lens achieves low F-number (high light gathering capability) by optimizing the refractive powers, curvatures, and spacing of all six lens elements. The specific parameter combinations allow for fast aperture while maintaining excellent aberration correction through the coordinated action of lenses with different refractive powers and aspheric surfaces.

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 achieves high-resolution imaging with excellent aberration correction, ensuring a well-balanced wide field of view, low-profileness, and low F-number, enhancing the optical performance of compact imaging devices.

Implementation Method 1

a first lens having positive refractive power and a convex surface facing the object side near an optical axis

Methodology Applied