Six-Lens Optical Assembly Aberration Control
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Solution Overview
Problem
Small, high-pixel photographing apparatuses require high-resolution and high-performance photographing lenses, but bright lenses with an F-number of 2.8 or less face challenges in achieving sufficient optical performance due to diffraction limitations.
Innovation Solution
A photographing optical lens assembly comprising six lenses with specific refractive powers and curvatures, including a first lens with positive refractive power, a second lens with negative refractive power, and a sixth lens with a concave image-side surface, arranged to optimize focal lengths and radii of curvature, ensuring high imaging performance while maintaining a small size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the F-number is reduced to 2.8 or less to achieve brighter imaging, then the light gathering capability is improved, but the optical performance deteriorates due to diffraction influence
Solution Approach 1:
The lens system is divided into six distinct lens elements with alternating positive and negative refractive powers. This segmentation allows each element to be optimized for specific functions: the positive lenses (G1, G3, G5) contribute to light gathering and focal power, while the negative lenses (G2, G4, G6) correct aberrations and control diffraction effects, achieving both bright imaging and high optical performance
Solution Approach 2:
Each lens element is designed with specific local characteristics: G1 has a convex object-side surface for light convergence, G2 has a concave image-side surface for aberration correction, G3-G6 have specific curvature relationships (e.g., |r42| < |r52|) to optimize local optical properties. The aspheric surfaces on specific elements provide localized quality improvement for diffraction control while maintaining overall system brightness
2Volume of moving object
If the lens assembly is made compact to reduce device size, then the portability is improved, but the imaging performance deteriorates due to limited optical path length
Solution Approach 1:
The six lens elements are nested in a compact sequence with alternating positive and negative powers, allowing the optical system to achieve effective focal length and aberration correction within a minimized total track length. The compact nesting of elements with different refractive powers enables high-performance imaging in a space-constrained environment
Solution Approach 2:
The lens elements utilize aspheric surfaces with specific curvature relationships (e.g., r11 < -r12, |r42| < |r52|) to maximize optical performance within the compact form factor. The curved aspheric surfaces enable efficient light control and aberration correction without requiring increased optical path length, maintaining imaging quality despite reduced overall size
3Measurement precision
If high-pixel solid-state photographing devices are used to achieve high resolution, then the image quality is improved, but the diffraction effect worsens due to smaller aperture requirements
Solution Approach 1:
The lens system employs specific parameter relationships including focal length ratios (1.0 < f3/f < 3.0, -3.5 < f2/f < 0.5) and curvature ratios (|r11| > |r12|, |r42| < |r52|) to optimize the balance between aperture size and diffraction effects. These parameter optimizations enable the system to maintain large effective aperture for high pixel sensors while controlling diffraction through precise optical design
Solution Approach 2:
The negative refractive power elements (G2, G4, G6) are strategically positioned to convert diffraction effects into beneficial aberration correction. The concave surfaces of these negative lenses counteract the diffraction patterns created by the aperture, transforming the harmful diffraction effect into improved point spread function and enhanced image quality for high-pixel sensors
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 lens assembly achieves high imaging performance with a small F-number and compact size, effectively correcting aberrations and maintaining performance across the image field, suitable for use in electronic devices such as smartphones and digital cameras.
Implementation Method 1
a first lens G1 having a positive refractive power, a second lens G2 having a negative refractive power, a third lens G3, a fourth lens G4, a fifth lens G5 having a positive refractive power, and a sixth lens G6 having a negative refractive power. The first to sixth lenses are sequentially arranged from an object side to an image side.
Data Source
AI summary
Provided are photographing optical lens assembly and an electronic apparatus. The photographing optical lens assembly includes a first lens having a positive refractive power, a second lens having a negative refractive power, a third lens; a fourth lens, a fifth lens having a positive refractive power, and a sixth lens having a negative refractive power. The first to sixth lenses are sequentially arranged from an object side to an image side, and the sixth lens has a concave image-side surface in a region around an optical axis.