Three-Element Aspheric Lens Compact Imaging System
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Solution Overview
Problem
Conventional compact imaging lens systems with two-lens elements fail to provide optimal image quality due to limited aberration correction, while systems with three-lens elements often have an excessive total track length, making it challenging to achieve a balance between image quality and compactness.
Innovation Solution
A three-non-cemented lens element system with specific refractive powers and surface shapes, including a first lens with positive refractive power, a second lens with negative refractive power, and a third lens with refractive power that changes from concave to convex, along with a stop positioned between the object and the first lens element, optimizing the axial distances and curvature radii to reduce the total track length while maintaining superior image quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a three-lens element structure is adopted to correct aberrations, then image quality is improved, but the total track length becomes too long
Solution Approach 1:
The patent applies parameter changes by optimizing the refractive indices, curvatures, and spacing of the three lens elements. Specifically, it uses a first lens with positive refractive power and aspheric surfaces, a second lens with negative refractive power, and a third lens with positive refractive power and aspheric surfaces. The aspheric coefficients and curvatures are carefully tuned to reduce the total track length while maintaining aberration correction, resolving the contradiction between image quality and compactness.
2Device complexity
If a two-lens element structure is used to reduce manufacturing cost, then device complexity is reduced, but aberration correction ability is limited
Solution Approach 1:
The patent segments the optical system into three distinct lens elements, each with specific refractive powers and surface characteristics. The first lens provides positive refractive power and aspheric correction, the second lens provides negative refractive power for balance, and the third lens provides additional positive refractive power with aspheric surfaces. This segmentation allows for comprehensive aberration correction while maintaining a relatively simple three-element structure that is manufacturable.
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 imaging lens system with improved image quality and reduced total track length, effectively correcting aberrations and maintaining precise positioning of lens elements, thus addressing the limitations of existing systems.
Implementation Method 1
a first lens element with positive refractive power having a convex object-side surface, and both the object-side and image-side surfaces being aspheric
Data Source
AI summary
This invention provides an image capturing lens system comprising three non-cemented lens elements with refractive power: a first lens element with positive refractive power having a convex object-side surface, and both the object-side and image-side surfaces being aspheric; a plastic second lens element with negative refractive power having a concave object-side surface and a convex image-side surface, and both the object-side and image-side surfaces being aspheric; and a plastic third lens element having a convex object-side surface and a concave image-side surface, and both the object-side and image-side surfaces being aspheric. By such arrangement, the space of the image capturing lens system can be allocated much more properly and thereby an image capturing lens system with shorter total track length can be obtained while retaining superior image quality.