Five-Lens Image Capture Assembly Compact Wide Field of View
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional image capturing lens assemblies struggle to achieve a wide field of view while maintaining compactness, as increasing the field of view often results in an increased total track length, making it difficult to meet high-end specifications and compactness requirements simultaneously.
Innovation Solution
An image capturing lens assembly comprising five lens elements with specific refractive powers and surface curvatures, including aspheric surfaces, is designed to optimize the axial distances and curvature radii between lens elements, ensuring a compact size and wide field of view while minimizing aberrations and chromatic aberration correction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the field of view is increased in conventional lens assemblies, then the wide field of view requirement is satisfied, but the total track length increases making the device non-compact
Solution Approach 1:
The patent employs aspheric surfaces on multiple lens elements (first, second, fourth, and fifth lens elements) to replace traditional spherical surfaces. This curvature optimization enables wider field of view coverage while maintaining a compact total track length by better controlling light ray paths and reducing the need for additional optical components that would increase length.
Solution Approach 2:
The patent optimizes specific parameter relationships including the axial distance ratio T12/T45 between lens elements, the curvature radius ratio (R9+R10)/(R9-R10) of the fifth lens element, and the positioning of convex critical points on the image-side surface of the fifth lens element. These parameter changes enable simultaneous achievement of wide field of view and compact dimensions.
2Length of moving object
If compactness is prioritized in lens assembly design, then the device size is reduced, but the ability to achieve wide field of view is compromised
Solution Approach 1:
By implementing aspheric surfaces on four out of five lens elements, the patent achieves superior light control within a compact form factor. The aspheric curvature profiles enable wide field of view angles to be captured without requiring increased total track length, directly resolving the contradiction between compactness and field of view.
Solution Approach 2:
The patent applies different surface characteristics to different lens elements - the first lens element has an aspheric object-side surface, the second lens element has aspheric surfaces on both sides, the fourth lens element has aspheric surfaces, and the fifth lens element has aspheric surfaces with specific convex critical point positioning. This localized optimization of surface quality enables compact design while maintaining wide field of view capability.
3Ease of manufacture
If conventional lens designs are used, then manufacturing is simpler, but aberration correction particularly in off-axis regions is insufficient
Solution Approach 1:
The patent uses aspheric surfaces on multiple lens elements to correct optical aberrations, particularly in off-axis regions. The aspheric curvature profiles provide additional degrees of freedom for aberration control compared to spherical surfaces, achieving superior image quality while remaining manufacturable through modern molding techniques.
Solution Approach 2:
The patent optimizes specific geometric parameters including the positioning of convex critical points on the image-side surface of the fifth lens element, the axial distances between lens elements (T12, T23, T34, T45), and the curvature radii (R9, R10). These parameter optimizations enhance aberration correction capability while maintaining manufacturability through precise control of lens geometry.
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 solution effectively reduces the total track length and size of the lens assembly, enhances image quality, and improves the ability to correct aberrations, particularly in off-axis regions, making it suitable for compact electronic devices with a wide field of view.
Implementation Method 1
The first lens element with negative refractive power has an image-side surface being concave in a paraxial region thereof. The second lens element has positive refractive power. The third lens element has negative refractive power. The fourth lens element has positive refractive power. The fifth lens element with negative refractive power
Data Source
AI summary
An image capturing lens assembly includes five lens elements, which are, 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 and a fifth lens element. The first lens element with negative refractive power has an image-side surface being concave in a paraxial region thereof. The second lens element has positive refractive power. The third lens element has negative refractive power. The fourth lens element has positive refractive power. The fifth lens element with negative refractive power has an image-side surface being concave in a paraxial region thereof and includes at least one convex critical point in an off-axis region thereof.