Four-Lens Optical System with Aspherical Elements for Mobile Camera Miniaturization
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Solution Overview
Problem
Conventional high-resolution mobile phone camera optical lens systems require multiple spherical lens elements, which restricts the degree of freedom and length of the optical system, and the gluing process is difficult to control, affecting image quality and miniaturization.
Innovation Solution
A four-lens optical lens system with specific refractive powers and surface curvatures, including a meniscus lens with negative power, a lens with positive power, a lens with negative power for chromatic aberration correction, and a lens with positive power for balancing aberrations, along with an aperture stop placement to enhance telecentricity and field of view, using plastic elements for miniaturization and improved precision.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple spherical lens elements are used to achieve high resolution, then image quality is improved, but the length of the optical system increases and the degree of freedom is reduced
Solution Approach 1:
The patent employs aspherical surfaces on lens elements instead of traditional spherical surfaces. This allows for better correction of optical aberrations and enables the system to achieve high image quality with fewer elements, thereby reducing the overall length of the optical system while maintaining or improving resolution.
Solution Approach 2:
The patent changes the refractive indices and Abbe numbers of the lens materials used. By selecting specific material parameters (e.g., 1.530<n1<1.600, 20<V1<40), the system achieves optimal aberration correction and image quality with a compact configuration, resolving the contradiction between image quality and system length.
2Measurement precision
If multiple glass lens elements are glued together to eliminate chromatic aberration, then chromatic aberration is corrected, but the manufacturing complexity and control difficulty increase
Solution Approach 1:
The patent replaces traditional multi-element glass lens systems with a simplified design using fewer elements, including aspherical plastic or hybrid lens elements. This eliminates the need for complex gluing processes while maintaining chromatic aberration correction through optimized material selection and surface design, significantly improving ease of manufacture.
3Length of stationary object
If the optical system is miniaturized with shorter focal length, then the size is reduced, but the field of view and image quality may be compromised
Solution Approach 1:
The patent uses aspherical surfaces on the lens elements, which enable the system to achieve a wider field of view within a compact form factor. The aspherical design allows for better control of light rays across the entire field, maintaining image quality while reducing system size and increasing adaptability.
Solution Approach 2:
The patent introduces inflection points on the lens surfaces, adding complexity in the surface curvature dimension rather than increasing the number of elements. This allows for compact miniaturization while maintaining wide field of view and high image quality through sophisticated surface geometry.
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 effectively corrects aberrations, improves image quality, and reduces the size of the optical lens system while enhancing photosensitivity and reducing shading, allowing for a wider field of view and shorter focal length, which is crucial for modern mobile phone cameras.
Implementation Method 1
a first meniscus lens element with negative refractive power; a second lens element with positive refractive power; a third lens element with negative refractive power; a fourth lens element with positive refractive power
Data Source
AI summary
An optical lens system for taking image comprises four lens elements with refractive power, from the object side to the image side: a first meniscus lens element with negative refractive power; a second lens element with positive refractive power having a convex object-side and a convex image-side surface; a third lens element with negative refractive power having a concave object-side surface and a convex image-side surface; a fourth lens element with positive refractive power having a convex object-side surface and a concave image-side surface; and an aperture stop located between the object and the second lens element. The above arrangements effectively reduce the volume of the optical lens system while providing a relatively high resolution.