Six-Element Optical Lens Assembly for Compact Aberration Control
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Solution Overview
Problem
Conventional optical systems struggle to balance high image quality, low sensitivity, proper aperture size, miniaturization, and desirable field of view due to rapid technological advancements in semiconductor manufacturing and increasing functionality requirements.
Innovation Solution
A photographing optical lens assembly comprising six lens elements with specific refractive powers and surface shapes, including aspheric surfaces and inflection points, to optimize image quality and field of view while minimizing size and sensitivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the number of lens elements is increased to improve image quality, then image quality is improved, but device complexity and total track length increase
Solution Approach 1:
The patent applies parameter changes by optimizing the refractive indices and Abbe numbers of specific lens elements. The first lens element has a refractive index between 1.66 and 1.70 with an Abbe number between 20 and 25, while the second lens element has a refractive index between 1.50 and 1.54 with an Abbe number between 55 and 60. These precise parameter specifications allow the patent to achieve high image quality with only six lens elements, avoiding the need for additional elements that would increase device complexity.
2Use of energy by moving object
If the aperture size is increased to improve light-gathering ability, then light-gathering ability is improved, but sensitivity increases which is undesirable
Solution Approach 1:
The patent applies local quality by designing different lens elements with specific optical properties tailored to their positions in the optical system. The first lens element with negative refractive power and specific refractive index/Abbe number characteristics is positioned to control light gathering, while subsequent elements with different material properties correct aberrations. This localized optimization allows the system to achieve proper light gathering without excessive sensitivity.
3Length of moving object
If the total track length is reduced for miniaturization, then device size is reduced, but image quality and field of view may deteriorate
Solution Approach 1:
The patent applies segmentation by dividing the optical system into six distinct lens elements, each with specific refractive power and material characteristics. The first lens element has negative refractive power to help shorten the overall track length, while the subsequent five elements with positive refractive power progressively correct aberrations and maintain image quality. This segmented approach with carefully controlled individual element properties enables miniaturization without sacrificing image quality.
4Adaptability or versatility
If the field of view is expanded for better coverage, then field of view is improved, but aberrations and image quality deteriorate
Solution Approach 1:
The patent applies composite materials by combining lens elements made from different optical materials with specific refractive index and Abbe number characteristics. The first lens element uses material with refractive index 1.66-1.70 and Abbe number 20-25, while the second lens element uses material with refractive index 1.50-1.54 and Abbe number 55-60. This composite material approach allows the system to achieve a desirable field of view while correcting chromatic and spherical aberrations to maintain high image quality.
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, aperture size, and field of view, enhancing light-gathering ability and correcting aberrations, while reducing the total track length and manufacturing complexity.
Implementation Method 1
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... a first lens element with negative refractive power... a second lens element with positive refractive power
Data Source
AI summary
A photographing optical 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. 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. The first lens element has negative refractive power. The object-side surface of the second lens element is concave in a paraxial region thereof. The image-side surface of the third lens element is concave in a paraxial region thereof.