Five-Lens Imaging System Aberration Correction
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Solution Overview
Problem
Existing imaging lenses struggle to achieve high resolution performance with increasing pixel counts and reduced size requirements in digital cameras and portable devices, as they often rely on four-lens configurations that are insufficient for modern imaging demands.
Innovation Solution
A five-lens imaging lens configuration is introduced, with specific refractive powers and aspheric surface optimizations, including a first lens with positive power, a second lens with negative power, a third lens with a convex surface, a fourth lens with positive power, and a fifth lens with negative power, where the image side surface of the fifth lens is concave and has decreasing negative power towards the periphery, satisfying certain conditional expressions for improved performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the number of lenses is increased from four to five, then resolution performance is improved, but device complexity increases
Solution Approach 1:
The imaging lens is divided into five distinct lens elements (first through fifth lenses), each with specific refractive powers and surface configurations. This segmentation allows each lens to contribute to correcting specific aberrations and improving overall resolution, with the fifth lens specifically designed with a concave image side surface having decreasing negative power toward the periphery to address field curvature and chromatic aberration.
Solution Approach 2:
Each lens element is designed with specific local optical properties: the first lens has positive refractive power, the second has negative refractive power, the third has a convex surface on the image side, the fourth has positive refractive power, and the fifth has negative refractive power with a specific power distribution pattern. These localized quality variations enable precise control over light paths to achieve high resolution while managing the complexity of the overall system.
2Volume of moving object
If the imaging device size is reduced, then portability is improved, but resolution performance deteriorates
Solution Approach 1:
The fifth lens employs a concave image side surface with specifically engineered curvature characteristics where the negative power decreases toward the periphery. This curved surface design, combined with the aspheric configurations of other lenses, enables compact lens spacing and reduced overall device volume while maintaining high resolution performance through optimized light path control.
Solution Approach 2:
The patent specifies precise parameter ranges for the lens system, including conditional expressions for focal lengths (f1, f2, f3, f), refractive indices (nd2, vd2), and surface curvature relationships. By optimizing these parameters, the system achieves high resolution in a compact form factor, with the fifth lens's specific power distribution playing a crucial role in maintaining performance while reducing size.
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
This configuration enhances resolution performance, corrects chromatic aberration and image field curvature, and enables high-resolution imaging in compact devices by optimizing the lens system for increased pixel counts and reduced size.
Implementation Method 1
a first lens having a positive refractive power; a second lens having a negative refractive power; a third lens having a convex surface on an image side near the optical axis thereof and having a positive refractive power
Data Source
AI summary
An imaging lens is provided and includes: in order from the object side, a first lens having a positive refractive power; a second lens having a negative refractive power; a third lens having a convex surface on the image side near the optical axis and having a positive refractive power; a fourth lens having a positive refractive power near the optical axis; and a fifth lens having a negative refractive power near the optical axis. An image side surface of the fifth lens is concave near the optical axis and has a region where a negative power of the region decreases toward a periphery of the fifth lens as compared with a negative power near the optical axis.