Multi-Element Optical Lens for Millimeter-Range Close Imaging
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Solution Overview
Problem
Existing optical lenses in electronic devices struggle to capture objects at close ranges clearly, leading to poor imaging quality and increased device size when external lenses are used.
Innovation Solution
An optical lens design comprising a sequence of lenses with specific refractive powers and configurations, including a first positive, second negative, third positive, and fourth negative lens, with optimized focal lengths and magnification ratios, allowing clear imaging of objects within millimeter distances.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If an optical lens is designed to capture objects at close range (millimeter distance), then imaging quality at close range is improved, but device size increases
Solution Approach 1:
The optical lens is divided into multiple lens elements (first positive lens, second negative lens, third positive lens, fourth negative lens) with different refractive powers. Each lens element contributes to the overall optical function, allowing the system to achieve close-range imaging capability while maintaining a compact form factor through distributed optical power rather than a single large element.
Solution Approach 2:
The patent describes an optical lens structure where multiple lens elements are arranged in sequence along the optical axis, with each subsequent lens element positioned within the optical path of the previous ones. This nested arrangement allows the compact integration of multiple optical functions (positive and negative refractive powers) in a space-efficient manner, enabling close-range imaging without proportionally increasing device size.
2Device complexity
If a single lens element is used, then device complexity is reduced, but imaging quality at close range deteriorates
Solution Approach 1:
Instead of using a single lens element, the patent segments the optical system into four distinct lens elements with alternating positive and negative refractive powers. This segmentation allows each element to be optimized for specific optical functions, achieving superior close-range imaging quality that cannot be obtained with a single element, while the modular structure facilitates manufacturing and assembly.
Solution Approach 2:
Each lens element in the patent is designed with specific local optical properties (positive or negative refractive power) tailored to its position in the optical path. The first and third lenses provide positive convergence, while the second and fourth lenses provide negative divergence, creating localized optical corrections that collectively achieve high-quality close-range imaging without requiring excessive complexity in any single element.
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 enables clear imaging of objects at close ranges while maintaining a compact device size, achieving high imaging quality and resolution.
Implementation Method 1
a first lens having a positive refractive power, a second lens having a negative refractive power, a third lens having the positive refractive power, and a fourth lens having the negative refractive power
Data Source
AI summary
The present application provides an optical lens, along an optical axis from an object side to an image side, at least includes: an aperture, a first lens having a positive refractive power, a second lens having a negative refractive power, a third lens having the positive refractive power, and a fourth lens having the negative refractive power, wherein an effective focal length f of the optical lens and an effective focal length f2 of the second lens satisfy a following relationship: |f/f2|<0.73. The present application provides a camera module and an electronic device.