Eight-Element Optical Imaging Lens for Large Aperture, Compact Length
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Solution Overview
Problem
The challenge lies in designing an optical imaging lens for portable electronic devices that requires a larger aperture, increased image height, and higher resolution while maintaining a shorter system length, which complicates the design due to the need for multiple lens elements and improved imaging quality.
Innovation Solution
An optical imaging lens comprising eight lens elements with specific refracting powers and surface shapes, including convex and concave regions, arranged along an optical axis to achieve a larger aperture, larger image height, and higher resolution, while satisfying the condition (V2+V5+V7)/V8≥2.200, where V2, V5, and V7 are the Abbe numbers of specific lens elements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the aperture and image height are increased to achieve higher resolution and more pixels, then the imaging quality is improved, but the system length increases and design difficulty increases
Solution Approach 1:
The optical imaging lens is divided into eight lens elements with different refracting powers and surface shapes, each contributing to specific optical functions. This segmentation allows the system to achieve high resolution and large aperture while maintaining compact length by distributing optical corrections across multiple specialized elements rather than requiring a single large element.
Solution Approach 2:
Different lens elements have different refracting powers (positive or negative) and specific surface shape characteristics (convex or concave periphery regions). This local differentiation of optical properties enables precise control of light paths throughout the system, achieving high resolution imaging while maintaining a compact overall structure.
2Measurement precision
If multiple lens elements are added to increase resolution and aperture, then the imaging quality is improved, but the device complexity increases
Solution Approach 1:
The optical system is segmented into eight lens elements, each with specific refracting power and surface characteristics. This segmentation allows complex optical corrections to be distributed across multiple simpler elements, making the overall system more manageable despite the increased number of components.
Solution Approach 2:
Each lens element is designed to perform multiple functions: correcting spherical aberration, chromatic aberration, and controlling light paths. This multi-functionality reduces the need for additional specialized elements, thereby managing device complexity while achieving high resolution.
3Illumination intensity
If the aperture is increased to receive more imaging rays, then the light gathering ability is improved, but the design difficulty increases
Solution Approach 1:
The lens elements have specific local surface characteristics (convex or concave periphery regions) that are optimized for their position in the optical train. This local optimization allows the large aperture to be achieved while each element contributes to correcting the specific aberrations introduced by the large aperture, managing design complexity.
Solution Approach 2:
The lens elements employ curved surfaces with specific convex or concave periphery regions to control light paths from the large aperture. These curved surfaces are essential for correcting spherical aberration and other off-axis aberrations that become more pronounced with larger apertures, thereby managing the increased design complexity.
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 design achieves a larger aperture, larger image height, and higher resolution with improved imaging quality, including reduced spherical and chromatic aberrations, while maintaining a compact system length, facilitating manufacturing and yield.
Implementation Method 1
Each of the first lens element to the eighth lens element includes an object-side surface facing the object side and allowing an imaging ray to pass through and an image-side surface facing the image side and allowing the imaging ray to pass through
Data Source
AI summary
Provided is an optical imaging lens, including a first lens element, a second lens element, a third lens element, a fourth lens element, a fifth lens element, a sixth lens element, a seventh lens element, and an eighth lens element sequentially arranged along an optical axis from an object side to an image side. The first lens element has positive refracting power. A periphery region of the object-side surface of the second lens element is convex. The third lens element has positive refracting power. A periphery region of the image-side surface of the third lens element is concave. An optical axis region of the image-side surface of the fifth lens element is concave. An optical axis region of the image-side surface of the sixth lens element is convex. A periphery region of the object-side surface of the eighth lens element is convex.