Five-Lens Mobile Camera Module for Compact High-Resolution Imaging

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Solution Overview

Problem

The challenge is to develop a lens module for mobile communications terminals with a reduced optical system length while maintaining high-resolution capabilities, as existing high-resolution optical systems with multiple lenses are difficult to mount in thinned terminals due to increased focal length.

Innovation Solution

The lens module comprises five lenses with specific refractive powers and shapes, including a first lens with positive refractive power, a second lens with negative refractive power, a third lens with positive refractive power, a fourth lens with negative refractive power and inflection points, and a fifth lens with negative refractive power and an inflection point, optimized to satisfy certain conditional expressions that minimize overall length and maximize resolution.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If a high-resolution optical system with multiple lenses is configured, then imaging resolution is improved, but optical system length increases making it difficult to mount in thinned terminals

Engineering Contradiction:

Improveimaging resolutionVSAvoidoptical system length

Core Design Contradiction:

Measurement precisionVSLength of moving object

Solution Approach 1:

The patent applies parameter changes by carefully controlling the refractive powers, curvatures, and axial positions of each lens element. Specifically, it sets the refractive powers of the first through fifth lenses to satisfy f1=2.66-2.80mm, f2=-5.50 to -4.00mm, f3=15.00-22.00mm, f4=-12.00 to -10.00mm, and f5=-12.00 to -10.00mm, while controlling the axial positions to satisfy 0.60 < D1/f1 < 0.80 and 0.25 < D2/f1 < 0.45. These parameter optimizations enable the optical system to achieve high resolution with a reduced total track length of 3.80-4.20mm.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent utilizes aspherical surfaces with inflection points on the object-side surface of the fourth lens and the image-side surface of the fifth lens. The aspherical coefficients are optimized to satisfy -1.50 < A04 < -0.50 for the fourth lens and -2.00 < A05 < -0.80 for the fifth lens. These curved surface designs improve light ray control and reduce aberrations, enabling compact optical system design while maintaining high imaging resolution.

Inventive Principle:

Principle #14Spheroidality (Curvature)

2Measurement precision

If the number of lenses is increased to achieve high resolution, then imaging quality is improved, but device complexity increases

Engineering Contradiction:

Improveimaging resolutionVSAvoidlens module complexity

Core Design Contradiction:

Measurement precisionVSDevice complexity

Solution Approach 1:

The patent optimizes the refractive indices and Abbe numbers of the lens materials to achieve high resolution with a controlled number of elements. The first lens uses material with 1.50 < n1 < 1.60 and 30 < v1 < 50, the second lens uses 1.60 < n2 < 1.80 and 20 < v2 < 40, and subsequent lenses use appropriately selected materials. This material parameter optimization allows the five-lens design to achieve high resolution without unnecessary complexity.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent employs aspherical surfaces with inflection points strategically positioned on the fourth and fifth lenses to correct optical aberrations. The aspherical coefficients A04 and A05 are controlled within specific ranges to achieve optimal aberration correction. This use of controlled aspherical surfaces reduces the need for additional lens elements, thereby maintaining device complexity at an acceptable level while achieving high imaging resolution.

Inventive Principle:

Principle #14Spheroidality (Curvature)

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 a compact lens module with a wide field of view, effectively miniaturizing the optical system while achieving high-resolution imaging, as demonstrated by the satisfaction of conditional expressions such as TTL/(ImgH*2) < 0.67 and 0.8 < BFL/f < 0.9, which facilitate both miniaturization and high-resolution implementation.