Six-Lens Wide-Angle Optical System for Thin Smartphones
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Solution Overview
Problem
Conventional wide-angle lens systems for smartphones face challenges in achieving high-resolution images with a wide-angle view while maintaining a compact size, due to limitations in refractive power distribution and lens thickness, which restricts their application in thin smartphone devices.
Innovation Solution
A small wide-angle lens system comprising six lenses with specific refractive power, shape, and Abbe number distributions, including convex and concave surfaces, and carefully designed distance intervals, to achieve efficient distortion correction and a short lens system length, enabling a high-resolution image with an angle of view greater than 78 degrees.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a conventional wide-angle lens system is used to achieve high-resolution images with wide-angle view, then the image quality and angle of view are improved, but the lens system length increases making it unsuitable for thin smartphones
Solution Approach 1:
The patent applies parameter changes by optimizing the refractive powers of individual lenses (P1 through P6) and their spacing (T12, T23, T34, T45, T56) to achieve a compact design. The specific parameter ranges defined for each lens element allow the system to maintain high resolution while reducing overall length to TTL/ImagH < 1.78
Solution Approach 2:
The patent uses composite material principles by combining plastic lens elements with specific Abbe numbers (V1-V6 ≥ 50) to achieve both compact size and high resolution. The use of plastic materials allows for lighter weight and more flexible design compared to traditional glass lenses
2Length of stationary object
If the lens system length is reduced for thin smartphones, then the portability and device thickness are improved, but the distortion correction capability deteriorates
Solution Approach 1:
The patent divides the lens system into six distinct lens elements with specific refractive power distributions (positive and negative powers). This segmentation allows each element to contribute to both the compact size and distortion correction, achieving TTL/ImagH < 1.78 while maintaining image quality
Solution Approach 2:
The patent applies local quality by assigning different refractive powers and Abbe numbers to different lens elements based on their positions in the optical path. This localized optimization enables effective distortion correction in specific regions while maintaining overall compact dimensions
3Weight of stationary object
If plastic material is used instead of glass for lens elements, then the weight and size are reduced, but the manufacturing precision and optical quality may deteriorate
Solution Approach 1:
The patent changes the material parameter by using plastic with specific Abbe numbers (V ≥ 50) instead of glass. This material selection, combined with optimized lens design parameters, achieves both weight reduction and maintained optical quality through precise control of refractive properties
Solution Approach 2:
The patent employs composite material principles by selecting plastic materials with specific optical properties (Abbe number ≥ 50) that combine the advantages of light weight with sufficient optical precision, replacing traditional heavy glass lenses while maintaining 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 allows for a compact lens system that provides high-resolution images with a wide-angle view, suitable for thin smartphone cameras, by optimizing refractive power and shape distribution among the lenses, thus overcoming the limitations of conventional systems.
Implementation Method 1
a small wide-angle lens system having a plurality of lenses arranged along an optical axis from a focal object side in order of a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens
Data Source
AI summary
A small wide-angle lens system having six lenses is proposed. In the lens systems, a first lens is biconvex toward a focal object, with center thickness (Tc) and thickness (Te) of the outermost effective diameter satisfying 1.1<Tc/Te<1.5, and a refractive power (P1) satisfying −0.06<P1<0.06. A second lens has a positive refractive power, a front surface convex toward the focal object, and a radius of curvature (R4) of the rear surface satisfying 10<|R4|. A third lens has a negative refractive power, a rear surface concave toward an image and a radius of curvature (R5) of the front surface satisfying 10<|R5|. A distance interval (T12) in an effective diameter of the first and second lenses satisfies T12<0.2 mm, and a distance interval (T23) within an effective diameter of the second and third lenses satisfies T23<0.1 mm.