Aspheric Plastic Lens Group for Compact Mobile Imaging
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Solution Overview
Problem
Conventional optical image capturing lenses for mobile electronic products face challenges in achieving high image quality while maintaining a compact design and cost-effectiveness, particularly in switching between near and far object photography, and require complex lens structures that are difficult to manufacture.
Innovation Solution
The optical image capturing lenses comprise a front lens group and a rear lens group, including at least five lens elements, with some elements made of plastic and featuring aspheric surfaces and inflection points, optimizing the field of view, distortion, and chief ray angle to achieve improved image quality and reduced production costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If a three-element lens structure is used, then the lens is compact, but the image quality is insufficient
Solution Approach 1:
The lens is divided into multiple groups (first lens group with positive refractive power, second lens group with negative refractive power, third lens group with positive refractive power) instead of using a simple three-element structure. This segmentation allows each group to be optimized for specific functions while maintaining compactness and improving overall image quality.
Solution Approach 2:
The patent uses a composite lens structure combining different refractive power elements (positive and negative) in specific arrangements. The first, second, and third lens groups have different refractive characteristics that work together to correct aberrations and improve image quality while keeping the overall lens compact.
2Manufacturing precision
If a four-element lens structure with glass spherical lens elements is used, then chromatic aberration is eliminated, but the total optical track length becomes too long and manufacturing becomes difficult
Solution Approach 1:
The lens is segmented into three functional groups with specific refractive powers arranged in sequence. This segmentation achieves chromatic aberration correction without requiring a four-element glass doublet structure, thereby reducing the total optical track length and simplifying manufacturing.
Solution Approach 2:
The patent changes the refractive power parameters of the lens elements to achieve chromatic aberration correction. By carefully selecting the refractive powers of the three lens groups (positive, negative, positive), the system corrects chromatic aberration without needing additional glass elements that would increase the optical track length.
3Manufacturing precision
If two different lens assemblies are used for near and far object photography, then imaging quality for both is maintained, but production cost and complexity increase
Solution Approach 1:
The three-element lens structure is designed to be universal for both near and far object photography. By optimizing the refractive powers and arrangements of the three lens groups, a single lens assembly can effectively handle various focusing distances without requiring multiple specialized assemblies, thereby reducing complexity and production costs.
Solution Approach 2:
The lens system is designed with dynamic focusing capability through the arrangement of three lens groups with different refractive powers. This dynamic design allows the lens to adapt to different object distances by adjusting the relative positions or configurations of the lens groups, enabling a single assembly to perform multiple functions.
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 enhances image quality, reduces production costs, and simplifies the manufacturing process by minimizing aberrations and total track length, enabling effective digital zoom and wide-angle functions without the need for multiple lens assemblies.
Implementation Method 1
The first lens element with refractive power has a convex object-side surface and a concave image-side surface. The second lens element has refractive power. The rear lens group includes, in order from an object side to an image side, a third lens element, a fourth lens element, a fifth lens element and a sixth lens element.
Data Source
AI summary
An optical image capturing lenses includes, in order from an object side to an image side, a front lens group, a stop, and a rear lens group. The front lens group includes, in order from the object side to the image side, at least a first lens element and a second lens element. The first lens element has a convex object-side surface and a concave image-side surface. The rear lens group includes, in order from the object side to the image side, at least a third lens element, a fourth lens element, a fifth lens element, and a sixth lens element. The sixth lens element is made of plastic material. The object-side surface and the image-side surface of the sixth lens are aspheric. The sixth lens element has at least one inflection point formed on at least one of the object-side surface and the image-side surface thereof.