Five-Element Plastic Optical Imaging Lens for Wide Field of View
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Solution Overview
Problem
The challenge is to develop an optical imaging lens for portable electronic devices that offers a large field of view, is cost-effective, and maintains high imaging quality while withstanding various environmental tests.
Innovation Solution
The proposed optical imaging lens consists of five lens elements with a small f-number, a larger field of view, and good imaging quality. The lens elements are designed with specific refracting powers and surface shapes, including concave and convex regions, to achieve these characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If glass lens elements are used to withstand environmental tests, then reliability is improved, but manufacturing cost and optical quality become challenging
Solution Approach 1:
The patent applies plastic lens elements instead of traditional glass lens elements. While plastic is generally considered less durable than glass, the patent achieves environmental durability through specific material selection and surface treatment techniques, while significantly reducing manufacturing cost and improving optical quality compared to conventional plastic lenses.
Solution Approach 2:
The patent employs composite material structures by combining plastic lens elements with specialized coatings and multi-layer configurations. This approach allows the lens to achieve both cost-effectiveness and environmental durability by leveraging the advantages of different materials in a composite system.
2Area of stationary object
If lens elements are made larger to increase field of view, then imaging coverage is improved, but device size and complexity increase
Solution Approach 1:
The patent divides the lens system into multiple plastic lens elements with different refractive powers and surface curvatures. This segmentation allows each element to contribute to specific optical functions, achieving a large field of view while keeping individual elements manageable in size and maintaining overall system complexity at acceptable levels.
Solution Approach 2:
The patent optimizes various parameters including refractive index, surface curvature radius, and thickness of each lens element to achieve the desired field of view. By carefully adjusting these parameters, the patent expands imaging coverage without proportionally increasing device size or complexity.
3Illumination intensity
If f-number is reduced to improve light gathering capability, then imaging quality is improved, but lens diameter and complexity increase
Solution Approach 1:
The patent reduces the f-number by optimizing the ratio of lens diameter to focal length through careful design of each lens element's parameters. By adjusting refractive indices, curvatures, and spacing, the patent achieves improved light gathering capability without excessive increase in overall lens diameter or system complexity.
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 achieves an enlarged field of view and reduced f-number while maintaining good imaging quality and cost-effectiveness, effectively addressing the challenges of environmental durability and manufacturing costs.
Implementation Method 1
each has an object-side surface which faces toward the object side to allow imaging rays to pass through as well as an image-side surface which faces toward the image side to allow the imaging rays to pass through
Data Source
AI summary
An optical imaging lens includes a first lens element to a fifth lens element, and each lens element has an object-side surface and an image-side surface. An optical axis region of the image-side surface of the first lens element is concave, the second lens element has negative refracting power, a periphery region of the image-side surface of the second lens element is convex, the fourth lens element has positive refracting power, and an optical axis region of the object-side surface of the fifth lens element is convex. Lens elements included by the optical imaging lens are only the five lens elements described above, and the optical imaging lens satisfies the relationship of TTL/Fno≥6.000 mm, TTL is the distance from the object-side surface of the first lens element to an image plane along the optical axis, and Fno is a f-number of the optical imaging lens.