Five-Lens Optical Imaging System with Alternating Refractive Powers
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Solution Overview
Problem
The challenge is to design an optical imaging lens that maintains a smaller surface area in front of the lens while increasing the field of view, while also achieving higher pixel and imaging quality, particularly for portable electronic devices like smartphones and cameras.
Innovation Solution
The optical imaging lens is designed with a specific configuration of lens elements, including a first lens element with negative refracting power and a fourth lens element with positive refracting power, along with an aperture stop positioned between the first and second lens elements, which allows for a reduced surface area and extended field of view by controlling the convex or concave shape of the surfaces and adhering to specific inequalities for optimal performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the effective radius of the first lens is increased to achieve broader field of view, then the field of view is improved, but the surface area in front of the lens is increased
Solution Approach 1:
The optical imaging lens is divided into five lens elements with alternating positive and negative refractive powers. This segmentation allows the system to achieve a half field of view of 50 degrees or more while maintaining a compact form factor, as each lens element contributes differently to the overall optical performance and field of view expansion.
Solution Approach 2:
The patent applies specific parameter constraints to optimize the optical system: the ratio of the sum of air gaps to the thickness of the fifth lens element (AAG/T5) is controlled to be 1.400 or less, and the half field of view is maintained at 50 degrees or more. These parameter changes enable the system to achieve broad field of view while minimizing the surface area in front of the lens.
2Manufacturing precision
If more lens elements are added to improve imaging quality, then imaging quality is improved, but device complexity is increased
Solution Approach 1:
The optical system is segmented into five lens elements with alternating positive and negative refractive powers. This segmentation approach improves imaging quality by correcting various optical aberrations while maintaining a manageable level of complexity through systematic design.
Solution Approach 2:
The patent employs a composite lens system combining materials with different refractive properties. The first, third, and fifth lens elements have negative refractive powers, while the second and fourth have positive refractive powers. This composite configuration enhances imaging quality by balancing and correcting optical aberrations across the system.
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 effectively maintains good imaging quality and extends the field of view while minimizing the surface area in front of the lens, improving the optical imaging lens's performance and assembly yield.
Implementation Method 1
The first lens element has negative refracting power... The fourth lens element has positive refracting power
Data Source
AI summary
An optical imaging lens may include a first, an aperture stop, a second, a third, a fourth, and a fifth lens elements positioned in an order from an object side to an image side along an optical axis. Through designing concave and/or convex surface of the lens elements, the optical imaging lens may have improved imaging quality, enlarged half field of view and reduced surface area in front of the optical imaging lens while the optical imaging lens may satisfy AAG/T5≤1.400 and HFOV≥50.000°, wherein a sum of the four air gaps from the first lens element to the fifth lens element along the optical axis is represented by AAG, a thickness of the fifth lens element along the optical axis is represented by T5, and a half field of view of the optical imaging lens is represented by HFOV.