Five-Lens Optical Imaging Lens for Compact Full-Screen Devices
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Solution Overview
Problem
Portable electronic devices face challenges in reducing the surface area of their front lenses while maintaining a large field of view and structural strength, particularly due to the design requirements of full-screen touchscreens.
Innovation Solution
A five-lens element optical imaging lens configuration with specific surface shapes and refracting powers is proposed, including concave and convex regions on lens elements, to reduce the front lens surface area while maintaining structural strength and achieving a larger field of view and improved imaging quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the surface area of the front lens is reduced to fit full-screen touchscreens, then the lens can be assembled into the opening of the touch screen, but the structural strength of the lens is reduced
Solution Approach 1:
The optical system is divided into five separate lens elements instead of using a single front lens. This segmentation allows the optical function to be distributed across multiple smaller components, reducing the surface area requirement of any single lens while maintaining overall optical performance and structural integrity through the combined system.
Solution Approach 2:
The five lens elements are arranged in a nested configuration along the optical axis, with each lens element positioned within the overall lens assembly. This nested arrangement allows the optical system to achieve the required field of view and imaging quality while minimizing the front surface area footprint to fit within the touchscreen opening.
2Area of stationary object
If the surface area of the front lens is reduced, then the lens can be assembled into the opening of the touch screen, but the field of view may be compromised
Solution Approach 1:
The optical system is divided into five separate lens elements with specific refracting powers and surface shapes. This segmentation allows the system to achieve a half field of view of 40 degrees or more while using a reduced front lens surface area, as the field of view is distributed and optimized across multiple elements rather than relying on a single large lens.
Solution Approach 2:
Each lens element is designed with specific local optical properties, including concave or convex object-side surfaces and image-side surfaces with specific curvatures. The third lens element has negative refracting power with a convex image-side surface, while the fourth lens element has a convex object-side surface. These localized optical characteristics enable the system to achieve the required field of view and imaging quality with a reduced front lens surface area.
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 configuration effectively reduces the front lens surface area while preserving structural integrity and enhancing imaging performance, as demonstrated by various embodiments that satisfy specific optical performance criteria such as TTL/T1≤5.600 and T1/AAG≥0.950.
Implementation Method 1
Each of the first lens element, the second lens element, the third lens element, the fourth lens element and the fifth 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 fifth lens element from an object side to an image side along an optical axis. An optical axis region of the object-side surface of the second lens element is concave, the third lens element has negative refracting power and an optical axis region of the image-side surface of the third lens element is convex, an optical axis region of the object-side surface of the fourth lens element is convex and a periphery region of the object-side surface of the fifth lens element is convex. Lens elements included by the optical imaging lens are only five lens elements described above. TTL is a distance from the object-side surface of the first lens element to an image plane along the optical axis and T1 is a thickness of the first lens element along the optical axis to satisfy TTL/T1≤5.600.