Seven Element Optical Imaging Lens Design
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Solution Overview
Problem
The challenge in designing optical imaging lenses is to achieve high resolution, increased aperture stop, and larger image height while managing the complexity of adding lens elements within a limited system length.
Innovation Solution
The optical imaging lens comprises seven lens elements, with specific refracting powers and surface shapes, including positive and negative refracting powers, concave and convex regions, and Abbe numbers that satisfy certain inequalities to optimize the lens design.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If more lens elements are added to increase resolution and aperture stop, then imaging quality improves, but device complexity and system length increase
Solution Approach 1:
The optical imaging lens is divided into seven distinct lens elements with specific refractive powers and surface shapes. Each lens element (first through seventh) has defined object-side and image-side surfaces with particular convex/concave characteristics, allowing the system to achieve high resolution through segmented optical correction of aberrations across different field zones
Solution Approach 2:
Different regions of lens surfaces are designed with different local properties. Specifically, the first lens element has a convex object-side surface and concave image-side surface, while the third lens element has concave object-side surface and convex image-side surface. The fifth and sixth lens elements have specific convex/concave configurations that optimize local light ray control for high-resolution imaging
2Measurement precision
If aperture stop is increased to allow more imaging rays, then resolution improves, but design difficulty increases
Solution Approach 1:
The patent specifies precise parameter ranges for lens element properties including refractive indices (n1 through n7), Abbe numbers (V1 through V7), surface curvatures, and thicknesses (T1 through T7). These parameter changes are optimized to control optical aberrations while maintaining a large aperture stop, with specific inequalities defined for the Abbe numbers to balance chromatic and spherical aberration correction
Solution Approach 2:
The lens elements utilize aspherical surfaces with specific curvature profiles. The object-side and image-side surfaces of each lens element are designed with controlled convex and concave regions that deviate from simple spherical shapes, enabling better aberration correction and allowing a larger aperture stop while maintaining high resolution across the image field
3Measurement precision
If image height is increased to accommodate high pixel number, then resolution improves, but system length increases
Solution Approach 1:
The optical system is designed with dynamic optimization of the seven lens elements to achieve a compact configuration. The specific arrangement of convex and concave surfaces, along with controlled air gaps between elements, allows the system to dynamically focus light rays across a large image height while maintaining a limited overall system length suitable for mobile electronic devices
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 enhances the lens's resolution, aperture stop, and image height, while also improving the control over optical aberrations and system performance.
Implementation Method 1
Each of the first, second, third, fourth, fifth, sixth and seventh lens elements may also have an object-side surface facing toward the object side and allowing imaging rays to pass through. Each of the first, second, third, fourth, fifth, sixth and seventh lens elements may also have an image-side surface facing toward the image side and allowing the imaging rays to pass through.
Data Source
AI summary
An optical imaging lens may include a first, a second, a third, a fourth, a fifth, a sixth, and a seventh lens elements positioned in an order from an object side to an image side. Through designing concave and/or convex surfaces of lens elements, the optical imaging lens may provide great resolution along with enlarged aperture stop and image height.