Nine-Element Imaging Lens Layout for Small F-Number and Large Image Height
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Solution Overview
Problem
The challenge lies in designing an optical imaging lens that is slim, thin, and short with a small f-number, large image height, and high image quality, suitable for portable electronic devices.
Innovation Solution
An optical imaging lens comprising nine lens elements with specific refracting powers and surface shapes, including convex and concave regions, arranged along an optical axis to meet the conditional expressions T9/T8≥0.700 and D32t51/D12t31≥1.600, ensuring a small f-number, greater image height, and good imaging quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the lens is designed to be slim and short, then the overall size is reduced, but the image height and field of view are limited
Solution Approach 1:
The optical lens system is divided into nine separate lens elements with different refracting powers and surface shapes, arranged in sequence along the optical axis. This segmentation allows each element to contribute specifically to reducing aberrations and enabling a compact form factor while maintaining large image height capability
Solution Approach 2:
Different lens elements have different refracting powers (positive or negative) and different surface shape configurations (convex or concave optical axis regions). This local quality variation allows precise control of light paths to achieve both compact size and large image height
2Illumination intensity
If the f-number is reduced to increase luminous flux, then more light is captured, but aberration control becomes more difficult
Solution Approach 1:
The patent specifies particular parameter ranges including T9/T8≥0.700 and D32t51/D12t31≥1.600, along with different refracting powers and surface shape configurations for each lens element. These parameter changes enable effective aberration control while maintaining a small f-number for increased luminous flux
3Measurement precision
If the image height is increased to improve pixel and resolution, then larger image sensors can be used, but the lens becomes larger and more complex
Solution Approach 1:
The lens system uses nine segmented lens elements with specific refracting powers and surface shapes, allowing the achievement of large image height (6.7mm in embodiments) without excessive overall complexity, as each element has a specific function in the optical path
Solution Approach 2:
By controlling specific parameters such as the thickness ratio T9/T8 and distance ratio D32t51/D12t31, the patent achieves large image height while maintaining manageable lens complexity through optimized geometric relationships
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 small f-number, large image height, and small volume with improved imaging quality, maintaining favorable aberration control and chromatic aberration, suitable for portable electronic devices.
Implementation Method 1
Each of the first lens element to the ninth lens element includes an object-side surface facing the object side and allowing imaging rays to pass through and an image-side surface facing the image side and allowing the imaging rays to pass through
Data Source
AI summary
Provided is an optical imaging lens, including a first lens element, a second lens element, a third lens element, a fourth lens element, a fifth lens element, a sixth lens element, a seventh lens element, an eighth lens element, and a ninth lens element sequentially arranged along an optical axis from an object side to an image side. The first lens element has positive refracting power, while the second lens element has negative refracting power. An optical axis region of the image-side surface of the fifth lens element is convex, while an optical axis region of the image-side surface of the seventh lens element is concave. The eighth lens element has positive refracting power or the ninth lens element has negative refracting power.