Nine-Lens Assembly with Abbe and F-Number Control
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Solution Overview
Problem
Lens assemblies for large-sized image sensors in portable electronic devices face challenges in miniaturization while maintaining high-quality image capture due to the need for multiple lenses, which can lead to increased chromatic aberration and astigmatism, and are not suitable for use in dark environments.
Innovation Solution
A lens assembly comprising nine lenses, including a third lens with a specific Abbe number and refractive power, and an F-number within a controlled range, to minimize aberration and astigmatism, enabling miniaturization and high-quality image capture.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the number of lenses is increased to provide aberration control performance suitable for large-sized image sensors, then image quality is improved, but device size increases making it unsuitable for portable electronic devices
Solution Approach 1:
The patent applies parameter changes by carefully selecting and controlling the Abbe number (v3) of the third lens within the range 20 ≤ v3 ≤ 40, and controlling the F-number within 1.7 ≤ Fno ≤ 2.0. These parameter optimizations enable effective aberration control with a reduced number of lenses, achieving high image quality while maintaining a compact form factor suitable for portable devices.
2Manufacturing precision
If the number of lenses is increased to improve aberration control, then image quality in various lighting conditions is improved, but chromatic aberration and astigmatism increase
Solution Approach 1:
The patent controls chromatic aberration and astigmatism by optimizing the Abbe number parameter of the third lens (20 ≤ v3 ≤ 40) and controlling the overall F-number (1.7 ≤ Fno ≤ 2.0). This parameter optimization allows the lens assembly to effectively reduce harmful aberrations while maintaining high image quality across different lighting conditions without requiring an excessive number of lenses.
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 lens assembly achieves miniaturization with improved aberration control, reduces chromatic aberration, and maintains high image quality in various lighting conditions, including dark environments.
Implementation Method 1
a third lens having positive refractive power and an Abbe number v3 satisfying 20≤v3≤40
Implementation Method 2
an eighth lens having negative refractive power and including an object side surface and an image sensor side surface, at least one of which is an aspherical surface including at least one inflection point
Data Source
AI summary
According to certain embodiments disclosed herein, a lens assembly and/or an electronic device including the same may include an image sensor, and first to ninth lenses sequentially arranged along an optical axis. The first lens may include a convex object side surface while having positive refractive power, the second lens may include a concave image sensor side surface while having negative refractive power, the third lens may have positive refractive power, and the eighth lens may have has negative refractive power and may include an object side surface and an image sensor side surface, at least one of which is an aspherical surface including at least one inflection point. The lens assembly and/or the electronic device may satisfy Conditional Expression 1: 20≤v3≤40 and Conditional Expression 2: 1.7≤Fno≤2.0. Here, “v3” may be an Abbe number of the third lens, and “Fno” may be an F-number of the lens assembly. Various other embodiments are possible.