Six-Lens Imaging Optical System Aberration Correction
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Solution Overview
Problem
Conventional optical systems face challenges in achieving a balance between high image quality, low sensitivity, compact size, and a suitable field of view, making it difficult to meet the increasing functionality requirements of electronic devices.
Innovation Solution
An imaging optical system comprising six lens elements with specific refractive powers, aspheric surfaces, and carefully optimized axial distances and focal lengths, including at least one lens element with an aspheric surface having an inflection point, to correct aberrations and reduce size while maintaining image quality.
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 size and complexity of the optical system increases
Solution Approach 1:
The optical system is divided into six distinct lens elements with specific refractive powers (positive or negative) arranged in a specific sequence. Each lens element is designed to address specific aberrations, allowing the system to achieve high image quality through functional segmentation rather than using a single complex lens
Solution Approach 2:
Different lens elements are assigned different refractive powers and surface curvatures tailored to their specific positions in the optical path. For example, the first lens element has positive refractive power with specific curvature radii for its object-side and image-side surfaces, while other elements have different configurations optimized for their local optical requirements
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 and size control become difficult
Solution Approach 1:
The optical system employs specific parameter relationships between focal lengths and axial distances to optimize light gathering while controlling sensitivity. The conditions |f/f3| + |f/f4| < 3.0 and f1/f6 between 0.5 and 2.0 establish precise parameter ranges that balance aperture performance with sensitivity requirements
3Area of stationary object
If the field of view is enlarged to improve coverage, then field of view is improved, but aberrations increase and image quality deteriorates
Solution Approach 1:
The patent employs aspheric surfaces on multiple lens elements to control aberrations across the field of view. The aspheric coefficients are specifically designed to maintain image quality at the edges and corners while preserving a wide field of view, replacing traditional spherical surfaces that would produce excessive aberrations at large field angles
Solution Approach 2:
The optical system uses asymmetric lens element configurations where each lens element has different curvature radii for its object-side and image-side surfaces. This asymmetry allows optimization for both wide field coverage and aberration control, with each surface shaped differently to handle the specific optical requirements of its position in the light path
4Length of moving object
If the axial distances between lens elements are reduced to miniaturize the system, then the size is reduced, but the correction of aberrations becomes difficult
Solution Approach 1:
The optical design pre-establishes specific axial distance relationships between lens elements before final assembly. The conditions TL/BL between 6.0 and 10.0 and T56/BL between 0.5 and 1.5 define preliminary spatial arrangements that ensure adequate aberration correction capability is built into the system architecture before considering miniaturization
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 enables a compact optical system with improved image quality and field of view, effectively addressing the balance between size, sensitivity, and functionality requirements.
Implementation Method 1
At least one lens element of the imaging optical system has at least one aspheric surface having at least one inflection point
Data Source
AI summary
An imaging optical system includes six lens elements which are, in order from an object side to an image side: 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. Each of the six lens elements has an object-side surface facing toward the object side and an image-side surface facing toward the image side. At least one lens element of the imaging optical system has at least one aspheric surface having at least one inflection point.