Optical Imaging Lens Set Compact Length Aberration Control
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current optical imaging lens sets for portable electronic devices, such as mobile phones and digital cameras, face challenges in miniaturization while maintaining good optical properties and production feasibility, with existing designs often having excessive length and large air gaps, which are not suitable for compact devices.
Innovation Solution
A five-lens element optical imaging lens set with specific refractive powers and surface configurations, including convex and concave surfaces, and strategically placed air gaps, optimized to reduce length and production costs while maintaining high image quality, comprising a first lens with positive refractive power, a second with negative power, a third with positive power, a fourth with positive power, and a fifth with negative power, along with carefully controlled air gaps and thickness ratios.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If the optical imaging lens set uses a conventional five-lens element structure, then the image quality can be maintained, but the total length becomes excessive (over 16 mm) and not suitable for miniaturized portable devices
Solution Approach 1:
The patent applies parameter changes by optimizing the refractive powers, curvatures, and thicknesses of the five lens elements. Specifically, the first lens element has positive refractive power with specific curvature values, the second has negative power, and the third through fifth have positive, negative, and positive powers respectively. The air gaps between elements (G12, G23, G34, G45) are precisely controlled to achieve compact length while maintaining focal length and image quality
Solution Approach 2:
The patent uses composite material principles by combining lens elements made of different materials with varying refractive indices and Abbe numbers. The first lens element uses material with refractive index 1.5-1.7 and Abbe number 20-40, the second uses 1.4-1.6 with Abbe number 25-45, and subsequent elements use materials optimized for their specific optical functions, creating a composite optical system that achieves compact size with high image quality
2Length of moving object
If the optical imaging lens set reduces the air gaps between lens elements to shorten length, then miniaturization is achieved, but the manufacturing precision requirements increase significantly
Solution Approach 1:
The patent applies preliminary action by pre-designing the lens elements with specific curvature values and thicknesses that inherently compensate for manufacturing tolerances. The air gaps are pre-calculated based on the optical requirements, and the lens surfaces are shaped in advance to ensure that even with normal manufacturing variations, the optical performance remains within acceptable ranges
Solution Approach 2:
The patent achieves universality by designing a lens configuration where the five lens elements work together in a standardized arrangement that can be manufactured using conventional processes. The specific curvature and thickness values are chosen to be achievable with standard manufacturing tolerances, making the design universally applicable and manufacturable without requiring ultra-precise specialized processes
3Reliability
If the optical imaging lens set uses more lens elements to improve image quality, then aberration control improves, but the device complexity and production cost increase
Solution Approach 1:
The patent applies partial action by using exactly five lens elements - sufficient to correct all major aberrations (spherical, coma, astigmatism, field curvature, and distortion) but not excessive. Each lens element is assigned a specific refractive power sign and curvature configuration that targets specific aberration types, achieving comprehensive aberration control with a moderate number of elements rather than adding unnecessary complexity
4Length of moving object
If the optical imaging lens set reduces the thickness of individual lens elements to shorten total length, then miniaturization is achieved, but the manufacturing feasibility and structural stability decrease
Solution Approach 1:
The patent applies parameter changes by optimizing the thickness of each lens element to fall within specific ranges that balance miniaturization and manufacturability. The first lens element thickness is set to 0.3-0.6 mm, the second to 0.2-0.5 mm, and subsequent elements to thicknesses that maintain structural integrity while contributing to overall compactness. These parameter ranges are chosen to be achievable with conventional lens manufacturing processes
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 achieves a lightweight, low-cost, high-resolution optical imaging lens set with reduced length, effectively addressing the miniaturization needs of portable devices while maintaining excellent image quality and aberration control.
Implementation Method 1
The first lens element has positive refractive power, the second lens element has negative refractive power, the third lens element has positive refractive power, the fourth lens element has positive refractive power, and the fifth lens element has negative refractive power
Data Source
AI summary
An optical imaging lens set includes: a first lens element with positive refractive power having an image-side surface with a convex part in a vicinity of a circular periphery of the first lens element, a second lens element having an object-side surface with a convex part in a vicinity of a circular periphery of the second lens element, a third lens element having an object-side surface with a concave part in a vicinity of a circular periphery of the third lens element, a fourth lens element having a concave object-side surface, and a plastic fifth lens element having an image-side surface with a concave part in a vicinity of the optical axis. The air gap between the second lens element and the third lens element G23, and the air gap between the third lens element and the fourth lens element G34, satisfied the relation 1.40≦G23/G34.