Six-Element Optical Imaging Lens for Compact System Length
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Solution Overview
Problem
The challenge is to design an optical imaging lens with six elements that reduces system length while maintaining high imaging quality and enlarging the field of view, which is essential for compact portable devices like mobile phones and digital cameras.
Innovation Solution
The optical imaging lens configuration includes specific thicknesses and air gaps between six lens elements, with each element having distinct refracting powers and surface shapes, adhering to specific optical conditions to optimize system performance, such as convex and concave regions on the lens surfaces and selective air gaps, ensuring a shorter system length and improved imaging quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If a conventional optical imaging lens with six lens elements is used, then the imaging quality can be maintained, but the system length becomes large which is unfavorable for size reduction of mobile phones and digital cameras
Solution Approach 1:
The optical system is divided into six distinct lens elements with specific refracting powers arranged in sequence. Each lens element is designed with specific surface shapes (convex/concave) and spacing to collectively achieve compact focal length while maintaining imaging quality. The segmentation allows optimization of each element's contribution to the overall system length.
Solution Approach 2:
Different regions of the lens elements have different refracting powers and surface curvatures. The first lens element has positive refracting power with specific convex/concave surfaces, while subsequent elements have varying positive/negative refracting powers with optimized surface shapes. This local optimization allows compact design without sacrificing imaging quality.
2Length of moving object
If the system length is reduced to meet size demands of portable devices, then the camera module becomes more compact, but the field of view may be limited and imaging quality may deteriorate
Solution Approach 1:
The patent optimizes multiple parameters including the refracting powers of individual lens elements, the spacing between elements (air gaps), the surface shapes (convex/concave regions), and the focal length to achieve a compact system length while maintaining a wide field of view. The conditional formulas provide specific parameter relationships that balance these competing requirements.
3Length of moving object
If the refracting powers and spacing of lens elements are optimized to reduce system length, then compactness is achieved, but the complexity of designing and manufacturing the lens increases
Solution Approach 1:
The patent provides specific conditional formulas that define the relationships between refracting powers, air gaps, and focal length. These formulas guide the design process by establishing clear parameter constraints, making the complex optimization task more systematic and manufacturable. The formulas ensure that the lens elements can be manufactured with standard precision while achieving the desired compactness.
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 achieves a shorter system length, enhanced imaging quality, and a larger field of view, effectively addressing the demands for compact and high-performance camera modules in portable devices.
Implementation Method 1
Each first lens element, second lens element, third lens element, fourth lens element, fifth lens element and sixth lens element respectively has an object-side surface which faces toward the object side and allows imaging rays to pass through as well as an image-side surface which faces toward the image side and allows the imaging rays to pass through
Data Source
AI summary
An optical imaging lens includes a first lens element to a sixth lens element. An optical axis region of the object-side surface of the first lens element is convex, an optical axis region of the image-side surface of the second lens element is convex, an optical axis region of the object-side surface of the third lens element is convex, the fourth lens element has negative refracting power, an optical axis region of the object-side surface of the fourth lens element is concave, a periphery region of the object-side surface of the fifth lens element is concave, an optical axis region of the object-side surface of the sixth lens element is convex and an optical axis region of the image-side surface of the sixth lens element is concave to satisfy (G12+T3+G34+T4+G45+T5)/EFL≥1.200.