Seven-element optical imaging lens with Abbe number control
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Solution Overview
Problem
Designing an optical imaging lens that is light, thin, short, and small with a small f-number, large field of view, and high image height while minimizing chromatic and optical aberrations is a challenging task due to the need for improved imaging quality and stricter market standards.
Innovation Solution
The optical imaging lens is designed with a specific arrangement of seven lens elements, including a first lens element with positive refracting power and convex periphery regions, and subsequent elements with varying refracting powers and surface shapes to optimize the passage of imaging rays, ensuring that the Abbe numbers and distances between surfaces satisfy specific conditions to reduce aberrations and enhance imaging quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the number of lens elements is increased to improve imaging quality and reduce aberrations, then chromatic aberration and optical aberration correction is improved, but device complexity and lens length increase
Solution Approach 1:
The patent applies parameter changes by precisely controlling the Abbe numbers of lens elements (V3+V4+V5+V6+V7≤195.000) and their surface curvatures to correct chromatic and optical aberrations. This allows achieving high imaging quality with a limited number of lens elements, avoiding the need for excessive complexity while maintaining superior optical performance through optimized parameter selection.
2Use of energy by moving object
If the f-number is reduced to increase luminous flux, then light gathering capability is improved, but optical aberration and imaging quality deteriorate
Solution Approach 1:
The patent reduces the f-number (Fno≤1.500) to increase luminous flux while maintaining imaging quality through precise parameter optimization of the lens elements. By controlling the Abbe numbers, surface curvatures, and refracting powers of individual elements, the design achieves both high light gathering capability and superior image quality without the trade-off that typically plagues wide-aperture lenses.
3Area of stationary object
If the field of view is increased to expand imaging range, then coverage area is improved, but optical aberration and imaging quality deteriorate
Solution Approach 1:
The patent increases the field of view (2ω≥90.000°) while maintaining imaging quality through optimized parameter selection for each lens element. The specific control of surface curvatures, thicknesses, and Abbe numbers allows the system to capture a wider field of view without suffering from the typical increase in optical aberrations that accompanies wide-angle designs.
4Manufacturing precision
If the image height is increased to accommodate larger image sensors, then pixel density and low light performance are improved, but lens length and device size increase
Solution Approach 1:
The patent increases the image height (≥5.000mm) to support larger image sensors for high pixel density and low light performance, while controlling lens length through optimized parameter selection. By carefully adjusting the Abbe numbers, surface curvatures, and spacing of the lens elements, the design achieves a compact form factor despite the larger image height requirement.
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 design achieves a smaller f-number, larger field of view, and improved chromatic and optical aberration correction, resulting in favorable imaging quality and a more efficient optical imaging system.
Implementation Method 1
Each of the first lens element to the seventh 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
An optical imaging lens includes first to seventh lens elements sequentially arranged along an optical axis from an object side to an image side, and each including an object-side surface facing toward the object side and allowing an imaging ray to pass through and an image-side surface facing toward the image side and allowing the imaging ray to pass through. The first lens element has positive refracting power. The fourth lens element has positive refracting power. A periphery region of the object-side surface of the fourth lens element is convex. An optical axis region of the object-side surface of the sixth lens element is convex. An optical axis region of the image-side surface of the sixth lens element is concave. An optical axis region of the object-side of the seventh lens element is concave. Lens elements of the optical imaging lens are only the seven lens elements described above.