Five-Lens Camera Optical Lens for Wide Angle and Ultra-Thin Profile

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Solution Overview

Problem

Camera lenses for handheld devices face challenges in achieving large aperture, wide angle, and ultra-thinness while maintaining good imaging quality, as existing designs often require optimization of refractive power, lens spacing, and shape to meet these requirements.

Innovation Solution

A camera optical lens configuration comprising five lenses with specific refractive powers and curvature radii, optimized to meet conditions such as focal length ratios, curvature radius ratios, and on-axis thickness ratios, ensuring a large aperture, wide angle, and ultra-thinness while correcting various aberrations.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If the number of lenses is increased to five lenses to improve imaging quality, then imaging quality is improved, but device thickness and complexity increase

Engineering Contradiction:

Improveimaging qualityVSAvoiddevice thickness

Core Design Contradiction:

ReliabilityVSLength of moving object

Solution Approach 1:

The patent applies parameter changes by precisely controlling the focal length ratios (f3/f between -6.00 and -3.70), curvature radius ratios (R2/R1 between -3.00 and -0.80), and thickness ratios (d3/d4 between 3.00 and 12.00) of each lens element. This systematic parameter optimization enables the five-lens system to achieve excellent imaging quality while maintaining ultra-thin profile, resolving the contradiction between improved imaging quality and increased device thickness

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent segments the optical system into five distinct lens elements with alternating positive and negative refractive powers. Each lens element is independently optimized with specific curvature radii and thickness parameters, allowing the system to correct various aberrations while maintaining a compact overall structure. This segmentation approach enables the five-lens system to achieve superior imaging quality without proportionally increasing device thickness

Inventive Principle:

Principle #1Segmentation

2Adaptability or versatility

If lens curvature radii are optimized to achieve wide angle, then field of view is improved, but aberrations increase

Engineering Contradiction:

Improvefield of viewVSAvoidoptical performance

Core Design Contradiction:

Adaptability or versatilityVSReliability

Solution Approach 1:

The patent converts the harmful effect of wide-angle aberrations into a benefit by strategically designing the alternating positive and negative lens elements. The negative lenses (first, third, and fifth lenses) are specifically configured with curvature radii ratios that correct the barrel distortion and field curvature inherent in wide-angle designs, while the positive lenses (second and fourth lenses) maintain the wide field of view. This transforms the aberration problem into an opportunity for optimized optical performance

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

Solution Approach 2:

The patent achieves wide field of view (≥122 degrees) while maintaining optical quality by precisely controlling the curvature radius parameters. Specifically, the ratio R2/R1 is constrained between -3.00 and -0.80, and the ratio (R7+R8)/(R7-R8) is constrained between 1.00 and 2.00. These parameter constraints enable the lens system to capture a wide field of view while correcting aberrations through mathematical optimization of the optical path

Inventive Principle:

Principle #35Parameter changes

3Length of moving object

If lens spacing and thickness are reduced to achieve ultra-thinness, then device profile is improved, but optical performance deteriorates

Engineering Contradiction:

Improvetotal optical lengthVSAvoidoptical performance

Core Design Contradiction:

Length of moving objectVSReliability

Solution Approach 1:

The patent achieves ultra-thin profile (TTL/IH ≤ 1.80) while maintaining optical performance by optimizing the thickness parameters of each lens element. The ratio d3/d4 is constrained between 3.00 and 12.00, and the ratio d6/d8 is constrained between 2.10 and 6.00. These parameter constraints ensure that each lens element contributes maximally to optical performance within minimal thickness, allowing the system to achieve both ultra-thinness and excellent imaging quality

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent employs dynamic optimization of lens spacing and thickness by allowing flexible adjustment of the air gaps between lens elements (d2, d4, d6, d8) while maintaining fixed constraints on the lens element thicknesses themselves. This dynamic approach enables the optical system to achieve the required optical performance with minimized total length, as the air gaps can be optimized for light path requirements without increasing the physical thickness of the lens assembly

Inventive Principle:

Principle #15Dynamics

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 lens configuration effectively achieves a large aperture, wide angle, and ultra-thinness while maintaining good imaging quality, suitable for high-pixel CCD, CMOS, and web camera lenses, with improved optical performance and reduced aberrations.