Four-Element Aspheric Lens System for Compact High Resolution Imaging
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Solution Overview
Problem
Conventional miniaturized optical lens systems in portable electronic products face challenges in achieving higher resolution and larger field of view while maintaining miniaturization, due to limitations in the number of glass spherical lens elements and increased manufacturing difficulties.
Innovation Solution
An optical lens system comprising four lens elements with specific refractive powers and surface shapes, including a first lens with negative refractive power, a second with positive refractive power, a third with aspheric surfaces, and a fourth with negative refractive power, optimized to reduce total track length and correct aberrations, allowing for a larger field of view and higher resolution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the number of lens elements is increased to improve image quality and field of view, then the resolution and field of view are improved, but the total track length increases and miniaturization is compromised
Solution Approach 1:
The patent employs a compact four-element lens structure where lens elements are closely spaced and nested within a minimized optical path. The total track length is controlled by nesting the lens elements efficiently, with the fourth lens element positioned close to the image sensor, achieving high image quality without increasing overall system length
Solution Approach 2:
The patent utilizes aspheric surfaces on the third and fourth lens elements, changing the geometric parameters from traditional spherical to aspheric profiles. This parameter change enables better aberration correction and allows for a more compact design with reduced total track length while maintaining high image quality
2Manufacturing precision
If glass spherical lens elements are used to eliminate chromatic aberration, then chromatic aberration is corrected, but the manufacturing difficulty increases due to bonding processes
Solution Approach 1:
The patent employs lens elements made from different optical materials with varying refractive indices and Abbe numbers. The first lens element uses material with high refractive power, while subsequent elements use materials with different dispersion properties. This composite material approach corrects chromatic aberration through material properties rather than requiring complex bonding processes
Solution Approach 2:
The patent extracts the chromatic aberration correction function from the bonding process itself and implements it through the selection of lens materials with complementary dispersion characteristics. By taking out the reliance on precision bonding and instead using material-based correction, the manufacturing complexity is reduced
3Volume of moving object
If the pixel size of the sensor is reduced to achieve miniaturization, then the device size is reduced, but the required optical resolution becomes higher
Solution Approach 1:
The patent employs aspheric surfaces on the third and fourth lens elements, replacing traditional spherical surfaces. This curvature modification enables better control of light rays, reducing aberrations and improving image resolution on small-pixel sensors without requiring larger optical components
Solution Approach 2:
The patent applies aspheric surfaces specifically to the third and fourth lens elements where they are most needed for correcting aberrations affecting the image plane. This localized application of advanced surface geometry provides high resolution for miniaturized sensors without requiring all lens elements to be complex aspheric designs
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 improved image quality, reduced sensitivity, and enhanced manufacturing ease, enabling the use of the optical lens system in portable electronic products with a larger field of view and higher resolution.
Implementation Method 1
the first lens element with negative refractive power having a convex object-side surface and a concave image-side surface, it will be favorable to enlarge the field of view of the optical lens system
Implementation Method 2
The second lens element with positive refractive power provides partial refractive power of the optical lens system, it will be favorable to reduce the total track length of the optical lens system
Implementation Method 3
the third lens element with positive refractive power, the object-side and the image-side surfaces of the third lens element being aspheric... the fourth lens element with negative refractive power having a concave image-side surface, the object-side and the image-side surfaces of the fourth lens element being aspheric
Data Source
AI summary
An optical lens system comprises, in order from an object side to an image side: the first lens element with negative refractive power having a convex object-side surface and a concave image-side surface; the second lens element with positive refractive power; the third lens element with positive refractive power having the object-side surface and the image-side surface being aspheric; the fourth lens element with negative refractive power having a concave image-side surface and at least one aspheric surface. There are four lens elements with refractive power. Such arrangements can enable a larger field of view, reduce the volume of the system, and further obtain higher resolution for the optical lens system of the present invention.