Seven-Lens Image System for Compact Device Aberration Correction
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Solution Overview
Problem
Conventional image capturing apparatuses face challenges in achieving compactness due to large glass lens elements, leading to size and thickness issues, which deviate from the trend of technological development towards portable and compact electronic devices.
Innovation Solution
An image picking-up system with seven lens elements, including specific refractive powers and surface configurations, such as convex and concave surfaces with inflection points, is designed to optimize focal lengths and axial distances, ensuring compactness and improved image quality while correcting aberrations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If glass lens elements are used to achieve high image quality, then image quality is improved, but the size and thickness of the image capturing apparatus increase
Solution Approach 1:
The patent applies parameter changes by transitioning from conventional glass lens elements to plastic lens elements, which have different optical properties including lower refractive index and different Abbe numbers. This material parameter change enables the design of a compact lens system with 7 elements that achieves high image quality while reducing overall size and thickness, directly resolving the technical contradiction between image quality and compact dimensions
Solution Approach 2:
The patent divides the image capturing apparatus into 7 separate lens elements arranged in specific groups (first group with elements 1-2, second group with elements 3-4, third group with elements 5-7). This segmentation allows each element to be optimized for specific aberration correction functions, achieving superior image quality through distributed correction while maintaining compact overall dimensions through optimized grouping and spacing
2Measurement precision
If the number of lens elements is increased to correct aberrations, then image quality is improved, but device complexity increases
Solution Approach 1:
The patent applies local quality by assigning specific aberration correction functions to specific lens elements based on their positions and optical properties. Elements 1 and 2 primarily correct spherical aberration and coma, elements 3 and 4 address field curvature and astigmatism, while elements 5, 6, and 7 handle chromatic aberration and distortion. This localized functional assignment achieves comprehensive aberration correction with a manageable 7-element configuration, balancing image quality improvement with controlled device complexity
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 system effectively reduces the size of the image capturing apparatus, enhances image quality, and corrects aberrations like astigmatism and coma, making it suitable for compact electronic devices without compromising image brightness or manufacturing feasibility.
Implementation Method 1
a first lens element 110 with positive refractive power, a second lens element 120 with negative refractive power, a third lens element 130 with positive refractive power
Data Source
AI summary
An image picking-up system includes seven lens elements, which are, in order from an object side to an image side, a first lens group including a first lens element and a second lens element, a second lens group including a third lens element and a fourth lens element, and a third lens group including a fifth lens element, a sixth lens element and a seventh lens element. The third lens element has positive refractive power. The fourth lens element has an image-side surface being concave in a paraxial region thereof. At least one surface of object-side surfaces and image-side surfaces of the seven lens elements includes at least one inflection point.