Six-Lens Image Capturing Assembly with Aspheric Inflection Points
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Solution Overview
Problem
Conventional optical systems face challenges in achieving a balance between high image quality, low sensitivity, proper aperture size, miniaturization, and a desirable field of view, making it difficult to meet the increasing functionality requirements of electronic devices with advanced image sensors.
Innovation Solution
An image capturing lens assembly comprising six lens elements with specific refractive powers and surface configurations, including inflection points and Abbe numbers, is designed to optimize the optical path, ensuring proper material selection and distribution to correct aberrations and enhance image quality while reducing the assembly size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the number of lens elements is increased to improve image quality, then image quality is improved, but the assembly size and complexity increase
Solution Approach 1:
The optical system is divided into six distinct lens elements with specific refractive powers and surface configurations. Each lens element is optimized for specific aberration correction functions, allowing the system to achieve high image quality through distributed functionality rather than requiring a single large optical component.
Solution Approach 2:
Different regions of the lens elements have different surface configurations - the object-side and image-side surfaces of each lens element have specific convex/concave characteristics in paraxial regions and inflection points in off-axis regions. This local variation in surface quality allows optimal performance across different field zones while maintaining compact dimensions.
2Use of energy by moving object
If the aperture size is increased to improve light gathering capability, then light gathering capability is improved, but the sensitivity control becomes difficult
Solution Approach 1:
The patent specifies precise parameter ranges for lens element properties including refractive power, Abbe numbers (V2, V3, V5, V6), thickness ratios (CT3/T34), and axial distances. By controlling these parameters within specific ranges, the system optimizes the balance between light gathering capability and sensitivity, ensuring proper aperture characteristics without requiring excessive aperture size.
3Area of stationary object
If the field of view is enlarged to improve coverage, then field of view is improved, but aberration correction becomes more difficult
Solution Approach 1:
The lens elements feature aspheric surfaces with inflection points in off-axis regions. Specifically, at least one surface of each lens element has inflection points that allow the surface curvature to vary dynamically across the aperture, enabling effective aberration correction across an enlarged field of view that would be impossible with simple spherical surfaces.
Solution Approach 2:
The optical system uses lens elements with different Abbe numbers (V2, V3, V5, V6) to correct chromatic aberrations across the field of view. The specific ratio constraints on these Abbe numbers ensure that different wavelengths are focused properly across the entire field, maintaining image quality from center to edge even with an enlarged field of view.
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 effectively balances image quality, sensitivity, and field of view, enabling the development of compact and high-performance optical systems for electronic devices with improved image capturing capabilities.
Implementation Method 1
The first lens element has positive refractive power, the fourth lens element has positive refractive power, and the sixth lens element has negative refractive power
Data Source
AI summary
An image capturing lens assembly includes six lens elements which are, in order from an object side to an image side along an optical path: a first lens element, a second lens element, a third lens element, a fourth lens element, a fifth lens element and a sixth lens element. The first lens element with positive refractive power has an object-side surface being convex in a paraxial region thereof. The fourth lens element with positive refractive power has an object-side surface being concave in a paraxial region thereof and an image-side surface being convex in a paraxial region thereof. The sixth lens element with negative refractive power has an image-side surface being concave in a paraxial region thereof. At least one of an object-side surface and an image-side surface of at least one lens element has at least one inflection in an off-axis region thereof.