Camera Optical Lens Free-Form Surface Aberration Correction
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current camera lenses, particularly for portable devices, face challenges in achieving a large aperture, wide angle, and ultra-thinness while maintaining excellent optical performance, due to insufficient refractive power allocation and lens shape settings, which result in inadequate correction of aberrations and field curvature.
Innovation Solution
A camera optical lens design incorporating five lenses with at least one free-form surface, optimized by specific refractive power and curvature radius conditions, including 2.00≤3/f≤5.50 and 2.00≤R4/R3≤23.00, to achieve a large aperture, wide angle, and ultra-thinness, effectively correcting distortion and field curvature.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If rotationally symmetric aspherical surfaces are used, then the lens can be made thinner and wider angle, but the off-axis aberration correction is insufficient
Solution Approach 1:
The patent introduces free-form surfaces that are non-rotationally symmetric, breaking the traditional symmetric design. This allows different correction strategies for different zones of the lens, enabling effective correction of off-axis aberrations while maintaining the thin and wide-angle characteristics. The asymmetric free-form surfaces provide additional degrees of freedom in the optical design that rotationally symmetric aspherical surfaces cannot achieve.
2Ease of manufacture
If conventional lens structures are used, then the manufacturing is simpler, but the imaging quality and aberration correction are insufficient
Solution Approach 1:
The patent employs free-form surfaces with complex mathematical parameters and profiles that go beyond conventional aspherical designs. By changing the surface parameterization from rotationally symmetric to free-form, the design achieves superior aberration correction and imaging quality. The free-form surfaces allow for optimized control of light rays across the entire field of view, addressing the limitations of conventional lens structures.
3Area of stationary object
If the lens is designed for large aperture and wide angle, then the field of view is improved, but the aberration correction becomes more difficult
Solution Approach 1:
The patent uses free-form surfaces that can be segmented into different zones with different optical characteristics. This segmentation allows for optimized correction of aberrations in different regions of the lens, particularly effective for wide-angle designs where off-axis performance is critical. The free-form surfaces provide localized control over light propagation, enabling better management of aberrations across the extended field of view.
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 design achieves excellent optical performance with a wide angle and large aperture, suitable for mobile phone and web camera lenses, providing improved imaging quality and correcting on-axis and off-axis aberrations.
Implementation Method 1
a first lens having a positive refractive power, a second lens having a negative refractive power, a third lens having a positive refractive power, a fourth lens having a positive refractive power, and a fifth lens having a negative refractive power
Data Source
AI summary
The present invention provides a camera optical lens, including, from an object side to an image side, a first lens having a positive refractive power, a second lens having a negative refractive power, a third lens having a positive refractive power, a fourth lens having a positive refractive power, and a fifth lens having a negative refractive power. At least one of the first to fifth lenses has a free-form surface, and the camera optical lens satisfies: 2.00≤f3/f≤5.50; 2.00≤R4/R3≤23.00, where f is a focal length of the camera optical lens, f3 is a focal length of the third lens, R3 is a central curvature radius of an object side surface of the second lens, and R4 is a central curvature radius of an image side surface of the second lens. The camera optical lens satisfies requirements of a large aperture, a wide angle and ultra-thinness, and has excellent optical performance.