Five-Lens Camera Optical Lens Aberration Correction
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Solution Overview
Problem
Conventional camera lenses for handheld devices face challenges in achieving a balance of big aperture, ultra-thinness, and wide angle due to unreasonable refractive power distribution and lens shape arrangements in five-piece lens structures, leading to suboptimal imaging quality.
Innovation Solution
A five-piece camera optical lens design with specific refractive power distributions and aspherical surfaces for the lenses, including a glass plate between the fifth lens and the image surface, optimizes focal lengths and curvature radii to correct aberrations and meet the design requirements of big aperture, ultra-thinness, and wide angle.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a five-piece lens structure is adopted to improve imaging quality, then optical performance is improved, but the lens structure becomes complex and difficult to achieve ultra-thinness
Solution Approach 1:
The patent applies parameter changes by optimizing the refractive powers, curvature radii, and thicknesses of the five lens elements. Specific parameter ranges are defined (e.g., refractive power ratios, curvature radius relationships) to achieve improved imaging quality while controlling the total optical length to meet ultra-thinness requirements.
2Illumination intensity
If the refractive power distribution is increased to achieve big aperture, then light gathering ability is improved, but aberrations increase and imaging quality deteriorates
Solution Approach 1:
The patent applies local quality by assigning different refractive powers and surface curvatures to different lens elements. Each lens element has specific local optical properties (positive or negative refractive power) that are optimized to control aberrations while maintaining large aperture capability. The second lens element, for example, has a specific negative refractive power to correct spherical aberration introduced by the first element.
3Length of stationary object
If the lens elements are made thinner to achieve ultra-thinness, then overall thickness is reduced, but optical performance and aberration correction capability deteriorate
Solution Approach 1:
The patent applies dimensionality change by utilizing the radial dimension through aspherical surfaces. Instead of simply reducing thickness in the axial dimension, the patent introduces aspherical surface shapes that provide additional degrees of freedom for aberration correction, enabling thin lens design without sacrificing optical performance.
4Adaptability or versatility
If wide angle is achieved by increasing field of view, then angular coverage is improved, but distortion and field curvature increase
Solution Approach 1:
The patent applies spheroidality by using aspherical surfaces on multiple lens elements. The aspherical shapes allow for better control of light rays across wide angles, reducing distortion and field curvature effects that would otherwise occur with simple spherical surfaces in a wide-angle configuration.
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 field of view of at least 76°, a total optical length to image height ratio of ≤1.65, and a F-number ≤2.2, ensuring high imaging quality and meeting the requirements of a big aperture, ultra-thinness, and wide angle.
Implementation Method 1
a first lens L1, a second lens L2, a third lens L3, a fourth lens L4 and a fifth lens L5, from the object side to the image side in sequence; the first lens L1 has a positive refractive power, an object-side surface of the first lens L1 protrudes to be convex and an image-side surface of the first lens L1 is concave; the second lens L2 has a negative refractive power, an object-side surface of the second lens L2 is convex, and an image-side surface of the second lens L2 is concave; the third lens L3 has a negative refractive power, an object-side surface of the third lens L3 is convex, and an image-side surface of the third lens L3 is concave; the fourth lens L4 has a positive refractive power, an object-side surface of the fourth lens L4 is concave, and an image-side surface of the fourth lens L4 is convex; and the fifth lens L5 has a negative refractive power, an object-side surface of the fifth lens L5 is convex, and an image-side surface of the fifth lens L3 is concave
Data Source
AI summary
The present application relates to the optical lens technical field and discloses a camera optical lens including, from an object side to an image side: an aperture, and a first, second, third, fourth and fifth lenses, each lens having, in sequence, a positive, negative, negative, positive and negative refractive power respectively. The camera optical lens satisfies following conditions: 1.00≤f1/f≤1.10; 0.40≤f4/f≤0.60; and 11.00≤R9/R10≤12.00; where mm denotes a unit of a focal length; f denotes a focal length of the camera optical lens; f1 denotes a focal length of the first lens; f4 denotes a focal length of the fourth lens; R9 denotes a curvature radius of an object-side surface of the fifth lens; and R10 denotes a curvature radius of an image-side surface of the fifth lens. The camera optical lens both has good optical performance and meets a design requirement of big aperture, ultra-thinness and wide angle.