Subminiature Optical System Using Aspherical Lenses for Aberration Control
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Solution Overview
Problem
Current mobile phone cameras face challenges in achieving high-definition imaging with limited flexibility and unsatisfactory optical capabilities due to the need for miniaturization and reduced costs, while also requiring smaller, lighter, and less expensive photographing lenses.
Innovation Solution
A subminiature imaging optical system is designed with a configuration of multiple plastic lenses, including an aperture stop and lenses with specific refractive powers and curvature radii, utilizing aspherical lenses to minimize aberrations and enhance optical properties, with an F number of 2.8 and an angle of view of at least 60 degrees.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If the number of photographing lenses is reduced to achieve miniaturization and low cost, then device size and cost are reduced, but design flexibility and optical capability are limited
Solution Approach 1:
The patent applies parameter changes by using aspherical lens surfaces with specific curvature radii and refractive indices to achieve high-definition imaging with only four lenses. The aspherical parameters and material properties are optimized to provide sufficient design flexibility while maintaining miniaturization and reducing the lens count.
2Length of moving object
If the number of photographing lenses is reduced to achieve miniaturization and low cost, then device size and cost are reduced, but optical capability becomes unsatisfactory
Solution Approach 1:
The patent uses aspherical lens parameters and specific material properties to achieve high-definition imaging with reduced lens count. The aspherical surface parameters are optimized to correct aberrations and maintain superior optical capability despite using only four lenses.
Solution Approach 2:
The patent employs plastic lens materials with specific refractive indices and Abbe numbers to achieve both miniaturization and high optical performance. The use of plastic materials allows for cost-effective manufacturing while maintaining the precision required for high-definition imaging.
3Manufacturing precision
If aspherical lenses are used to achieve high-definition imaging, then optical properties are improved, but manufacturing complexity increases
Solution Approach 1:
The patent uses aspherical lens parameters to achieve high-definition imaging while managing manufacturing complexity through optimized design parameters that balance optical performance with manufacturability.
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 system achieves high-definition imaging with reduced chromatic and spherical aberrations, miniaturization, and cost-effectiveness by optimizing lens configurations and materials, making it suitable for mobile phone cameras.
Implementation Method 1
a first lens (L1) having a positive refractive power and being convex at an object side
Implementation Method 2
a second lens (L2) having a negative refractive power
Implementation Method 3
at least one of refractive surfaces of the first, third and fourth lenses is aspherical
Data Source
AI summary
A subminiature imaging optical system suitable for a subminiature optical device such as a mobile phone camera. An aperture stop is provided. A first lens has a positive refractive power and is convex at an object side. A second lens has a negative refractive power. A third lens has a positive refractive power. Also, a fourth lens has a negative refractive power. The optical system has a total length along an optical axis direction according to following relation 1:1.2<TL/f<1.5relation 1,where TL is a distance from the aperture stop to an image plane, and f is an effective focal distance of an entire optical system.