Seven-Element Aspheric Lens Layout for Compact Low-Light Imaging
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Solution Overview
Problem
Conventional optical systems in compact devices fail to meet the demands for high resolution and image quality, particularly in mobile terminals and vehicle devices, due to insufficient light moderation and aberration issues, especially in low-light environments.
Innovation Solution
A seven-element optical image capturing system with specific refractive powers and aspheric surfaces for each lens element, including a first lens with negative power and aspheric surfaces, moderates light and corrects aberrations, maintaining a compact size and enhancing image quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional four-element or five-element lens structures are used, then the device complexity is reduced, but the image quality and resolution cannot satisfy high-end requirements
Solution Approach 1:
The optical system is divided into seven distinct lens elements with specific refractive powers arranged in sequence. Each lens element (first through seventh) has defined optical characteristics including aspheric surfaces with specific curvature radii, allowing independent optimization of light modulation at different stages to achieve high image quality while maintaining compact form factor
Solution Approach 2:
Multiple lens elements incorporate aspheric surfaces instead of simple spherical surfaces. The first lens element has an aspheric object-side surface with curvature radius R1, the sixth lens element has an aspheric image-side surface with curvature radius R12, and the seventh lens element has an aspheric object-side surface with curvature radius R13. These aspheric curvatures enable precise control of light rays to reduce aberrations and improve image quality
2Illumination intensity
If conventional lens structures are used, then the device size is compact, but the light moderation capability is insufficient resulting in dim periphery images
Solution Approach 1:
Different regions of the lens elements have different optical properties optimized for their specific functions. The aspheric surfaces have varying curvature radii at different zones (object-side surface with radius R1, image-side surface with radius R12) to locally modulate light angles. The sixth and seventh lens elements have convex shapes in off-axial regions to specifically address peripheral light moderation while keeping the overall device compact
Solution Approach 2:
The seven lens elements are arranged in a nested sequence from object side to image side, with each element contributing to light moderation. The compact arrangement allows the optical system to fit within a small volume while maintaining sufficient light moderation capability through the cumulative effect of multiple lens elements with specific refractive powers and aspheric surfaces
3Measurement precision
If conventional lens structures are used, then the device complexity is low, but the resolving power and image clarity are insufficient for vehicle devices
Solution Approach 1:
The optical system is segmented into seven lens elements with specific refractive powers arranged in sequence. Each lens element (first through seventh) has defined optical characteristics including aspheric surfaces with specific curvature radii, allowing independent optimization of light modulation at different stages to achieve high image quality while maintaining compact form factor
Solution Approach 2:
The optical system employs specific parameter relationships to optimize resolving power. The curvature radii of aspheric surfaces (R1, R12, R13) and the axial distances between lens elements are carefully controlled within specific ranges to maximize light moderation capability and image clarity while managing system 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 system improves image quality and resolution, especially in low-light conditions, by moderating light angles and reducing aberrations, while maintaining a compact form factor suitable for mobile and vehicle devices.
Implementation Method 1
The first lens element with negative refractive power has an image-side surface being concave in a paraxial region thereof
Implementation Method 2
an object-side surface and the image-side surface of the sixth lens element are aspheric. The seventh lens element with refractive power has an image-side surface being concave in a paraxial region thereof and includes at least one convex shape in an off-axial region thereof, wherein an object-side surface and the image-side surface of the seventh lens element are aspheric
Data Source
AI summary
An optical image capturing system comprising, in order from an object side to an image side, a first lens element, a second lens element, a third lens element, a fourth lens element, a fifth lens element, a sixth lens element and a seventh lens element. The first lens element with negative refractive power has a concave image-side surface. The second lens element, the third lens element and the fourth lens element have refractive power. The fifth lens element has refractive power. The sixth lens element with refractive power has an image-side surface being concave in a paraxial region and includes at least one convex shape in an off-axial region, wherein the surfaces thereof are aspheric. The seventh lens element with refractive power has an image-side surface being concave in a paraxial region and includes at least one convex shape in an off-axial region, wherein the surfaces thereof are aspheric.