Six-Element Lens Assembly for Compact Imaging Aberration Control
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Solution Overview
Problem
The challenge is to design a compact image capturing lens assembly for electronic devices that achieves a large view angle and high resolution while minimizing aberrations, particularly chromatic aberration, which is difficult to correct with large apertures in miniaturized camera systems.
Innovation Solution
The lens assembly consists of six elements with specific refractive powers and surface curvatures, including aspheric surfaces, arranged to optimize light convergence and reduce aberrations, with conditions such as V4+V5+V6<100 and (R11+R12)/(R11−R12)≤1.0, ensuring effective aberration correction and miniaturization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the lens assembly is miniaturized to meet compactness requirements, then the size and volume are reduced, but chromatic aberration becomes difficult to correct
Solution Approach 1:
The lens assembly is divided into six distinct lens elements with different refractive powers and Abbe numbers. This segmentation allows each element to contribute differently to aberration correction, enabling effective chromatic aberration control in a compact form factor by distributing the correction function across multiple specialized components rather than relying on a single large element.
Solution Approach 2:
The patent employs lens elements with different Abbe numbers (V4, V5, V6) and refractive indices, creating a composite optical system. This combination of materials with different optical properties enables chromatic aberration correction through the dispersion characteristics of each material, allowing the compact assembly to achieve large aperture and wide view angle while correcting chromatic effects.
2Illumination intensity
If the aperture is enlarged to achieve high resolution, then light gathering capability improves, but chromatic aberration becomes more difficult to correct
Solution Approach 1:
The aperture is distributed across six lens elements rather than being concentrated in a single large element. This segmentation allows each element to have optimized refractive power and Abbe number, enabling the system to achieve large effective aperture for high resolution while each element contributes to chromatic aberration correction through its specific optical properties.
Solution Approach 2:
The patent utilizes variations in Abbe numbers (V4, V5, V6) and refractive indices across different lens elements to correct chromatic aberration. By changing the optical parameters of each element, the system achieves large aperture capability while compensating for chromatic effects through the combined dispersion characteristics of the multi-element design.
3Area of stationary object
If the view angle is increased to achieve wide field of view, then the field coverage improves, but aberration correction becomes more challenging
Solution Approach 1:
The lens assembly is segmented into six elements with progressively optimized surface curvatures and refractive powers. This segmentation allows different elements to address different aspects of aberration across the wide field of view, with each element contributing to both the wide angle capability and the correction of off-axis aberrations that would be difficult to control in a single-element design.
Solution Approach 2:
The patent employs aspheric surfaces on multiple lens elements to correct aberrations across the wide view angle. The curved surfaces are optimized to control light rays from different field angles, enabling the system to achieve wide field coverage while maintaining sharp focus and reducing distortion and other off-axis aberrations.
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 enables a compact lens assembly with improved longitudinal and lateral aberration correction, enhanced image quality, and a wide view angle, while maintaining a relatively small size and high aperture, effectively addressing the limitations of miniaturized camera systems.
Implementation Method 1
a first lens element with positive refractive power having an object-side surface being convex thereof; a second lens element having negative refractive power; a third lens element; a fourth lens element; a fifth lens element with positive refractive power
Implementation Method 2
an object-side surface and the image-side surface being aspheric, wherein an Abbe number of the fourth lens element is V4, an Abbe number of the fifth lens element is V5, an Abbe number of the sixth lens element is V6
Data Source
AI summary
A image capturing lens assembly includes six lens elements, the six lens elements being, in order from an object side to an image side: a first lens element with positive refractive power having an object-side surface being convex thereof; a second lens element having negative refractive power; a third lens element; a fourth lens element; a fifth lens element with positive refractive power having an object-side surface being convex and an image-side surface being convex thereof; and a sixth lens element having an image-side surface being concave in a paraxial region thereof, the image-side surface having at least one convex critical point in an off-axial region thereof, and an object-side surface and the image-side surface being aspheric.