Seven-Element Optical Imaging Lens Compact System Length
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Solution Overview
Problem
The challenge is to design an optical imaging lens with a larger aperture, increased image height, and higher resolution, while maintaining a short system length, which is difficult due to the need for multiple lens elements and the complexity of achieving high pixel count and resolution.
Innovation Solution
The optical imaging lens consists of seven specifically arranged lens elements, each with unique refracting powers and surface curvatures, including positive and negative refracting powers, concave and convex surfaces, to satisfy specific conditions that enhance aperture, image height, and resolution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple lens elements are added to increase resolution and aperture, then imaging quality and aperture are improved, but system length increases
Solution Approach 1:
The patent implements a nested lens structure where lens elements are arranged in a compact configuration along the optical axis. The first lens element has positive refracting power followed by a second lens element with negative refracting power, creating a telescopic nested arrangement that allows multiple elements to occupy minimal space while maintaining optical functionality. This nesting approach enables high resolution and aperture without proportionally increasing system length.
Solution Approach 2:
The patent employs specific refracting power parameters and surface curvature characteristics for each lens element. The first lens element has positive refracting power with a concave periphery region on its image-side surface, while the second lens element has negative refracting power. These parameter optimizations allow the lens system to achieve high imaging quality with reduced overall length by carefully controlling the optical characteristics of individual elements.
2Illumination intensity
If aperture is increased to receive more imaging rays, then light gathering capability is improved, but design complexity increases
Solution Approach 1:
The patent applies different surface curvature characteristics to different regions of the lens elements. Specifically, the periphery region of the image-side surface of the first lens element is concave, while the optical axis region may have different curvature properties. This local quality differentiation allows the lens to optimize light gathering capability at the aperture while controlling aberrations and maintaining manageable design complexity through region-specific optimization.
3Measurement precision
If image height is increased to meet pixel count requirements, then resolution is improved, but system length increases
Solution Approach 1:
The patent optimizes the optical path by carefully arranging lens elements along the optical axis and controlling the curvature of surfaces in multiple dimensions. The concave periphery region of the first lens element's image-side surface and other surface curvature optimizations enable the system to achieve larger image height for higher pixel count while minimizing the axial length through multi-dimensional optimization of the 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 lens design achieves a larger aperture, larger image height, and excellent imaging quality by optimizing the arrangement and refracting powers of the lens elements, while maintaining a compact system length.
Implementation Method 1
The first lens element has positive refracting power, and a periphery region of the image-side surface of the first lens element is concave. The second lens element has negative refracting power.
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, wherein 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. The first lens element has positive refracting power, and a periphery region of the image-side surface of the first lens element is concave. The second lens element has negative refracting power. An optical axis region of the image-side surface of the third lens element is convex. An optical axis region of the image-side surface of the fourth lens element is concave. The sixth lens element has negative refracting power. In particular, the optical imaging lens only has seven lens elements.