Compact Imaging Optical System with Cemented Doublet for Chromatic Aberration Correction
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Solution Overview
Problem
Conventional camera modules in mobile devices and surveillance cameras face challenges in achieving high-resolution imaging with compactness and effective correction of chromatic aberration, particularly in high-pixel grade applications.
Innovation Solution
The proposed imaging optical system consists of a specific configuration of lenses, including an aperture stop, a first lens with positive refractive power and convex surfaces, a second and third lens with combined negative refractive power, a fourth lens with positive refractive power and convex image-side surfaces, and a fifth lens with negative refractive power and aspherical surfaces, optimized by specific conditions for refractive power, focal lengths, and Abbe numbers to ensure high-definition imaging and chromatic aberration correction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If four lenses are used to correct chromatic aberration, then chromatic aberration correction is improved, but device complexity increases
Solution Approach 1:
The patent combines the second and third lenses into a cemented doublet structure, merging two separate optical elements into a single integrated component. This reduces the total number of discrete lens elements from four to three while maintaining chromatic aberration correction capability, as the cemented doublet functions as a unified optical element with controlled dispersion properties.
Solution Approach 2:
The first lens is designed to perform multiple functions simultaneously: it provides positive refractive power for focusing, corrects spherical aberration through its specific curvature design, and contributes to overall chromatic aberration control. This multi-functionality allows the system to achieve high image quality with fewer lens elements.
2Measurement precision
If more lenses are used to increase resolution, then screen resolution is improved, but device complexity increases
Solution Approach 1:
By cementing the second and third lenses together into a single doublet structure, the patent reduces the number of discrete optical elements while maintaining the optical performance needed for high-resolution imaging. This integration achieves the same resolution enhancement with fewer separate components.
Solution Approach 2:
The patent optimizes specific parameters of each lens including refractive indices, Abbe numbers, curvature radii, and thickness ratios to achieve high resolution with a compact three-lens configuration. By carefully controlling these parameters, the system attains superior image quality without requiring additional lens elements.
3Volume of moving object
If compact form factor is maintained, then device portability is improved, but manufacturing precision requirements increase
Solution Approach 1:
The cemented doublet structure of the second and third lenses eliminates the need for precise spacing control between these elements, as they are permanently bonded together. This integration reduces manufacturing complexity and alignment requirements while maintaining the compact form factor, as the doublet acts as a single rigid unit.
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
This configuration enhances image quality by improving resolution and reducing chromatic aberration, leading to superior color fidelity both indoors and outdoors, while maintaining a compact form factor and allowing for mass production at a lower cost using plastic lenses.
Implementation Method 1
a first lens disposed at an image side of the aperture stop, the first lens having a positive refractive power
Implementation Method 2
the imaging optical system... correcting chromatic aberration superbly... where Vd2 and Vd3 are Abbe numbers of the second lens and the third lens, respectively
Data Source
AI summary
There is provided a high-definition imaging optical system including: an aperture stop; a first lens disposed at an image side of the aperture stop, the first lens having a positive refractive power and having a convex object-side surface; a second lens disposed at an image side surface of the first lens; a third lens disposed at an image side surface of the second lens; a fourth lens having a convex image-side surface and having a positive refractive power; and a fifth lens having a concave image-side surface and having a negative refractive power, wherein a combined refractive power of the second and third lenses is negative. The optical system is high-performing and compact and can be further improved in resolution. Also, the optical system can correct chromatic aberration and improve color fringing in the case of indoor or outdoor photographing.