Dual-Unit Lens Assembly for Wide-Aperture Telephoto and Macro Imaging
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Solution Overview
Problem
Existing camera modules lack a wide-aperture design capable of meeting high-quality imaging requirements for both distant and close-up image-shooting scenes, particularly in low-light conditions, and fail to effectively switch between telephoto and macro functions.
Innovation Solution
A lens assembly with two sequentially arranged lens element units, where the first unit has positive focal power and the second unit has negative focal power, allowing for a wide-aperture design and enabling a movable second unit to switch between infinity and macro states, optimizing focal power allocation to enhance light refraction and imaging capabilities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a wide-aperture lens assembly is designed to increase light admission for distant night photography, then the imaging quality for distant scenes is improved, but the resolution and magnification capability for close-up macro scenes deteriorates
Solution Approach 1:
The lens assembly is divided into multiple lens elements with different focal powers (positive and negative). This segmentation allows each element to contribute differently to the overall optical performance, enabling the system to achieve wide aperture while maintaining macro imaging capability through coordinated action of divergent and convergent elements
Solution Approach 2:
The lens assembly incorporates a movable lens unit that can shift along the optical axis to switch between infinity focus and macro focus modes. This dynamic adjustment mechanism allows the same lens assembly to adapt its focal length and magnification based on shooting distance, resolving the contradiction between distant and close-up imaging requirements
2Measurement precision
If the lens assembly is designed for telephoto function with long focal length, then distant image-shooting quality is improved, but the device size and complexity increase
Solution Approach 1:
The lens assembly is designed to perform multiple functions including telephoto imaging, macro photography, and variable aperture control within a single integrated structure. By incorporating both positive and negative focal power elements that can work together or independently, the system achieves multi-functionality without requiring separate lens modules for each mode
Solution Approach 2:
The lens assembly employs a compact nested arrangement where smaller lens elements are positioned within or alongside larger elements. This nesting approach allows multiple optical elements to be packed into a smaller overall footprint, reducing device complexity and size while maintaining the optical performance needed for telephoto functionality
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 assembly achieves high-quality imaging in distant scenes with a wide aperture and long focus, and high-resolution, high-magnification imaging in close-up scenes, while maintaining a small size and low cost, thus enriching the camera module's image-shooting functions.
Implementation Method 1
The first lens element satisfies a conditional expression: |(R11+R12)/f1|>2.3, where R11 is a curvature radius of an object side surface of the first lens element, R12 is a curvature radius of an image side surface of the first lens element, and f1 is a focal length of the first lens element... improve a refraction capability of the first lens element, increase an amount of admitted light of the lens assembly
Implementation Method 2
The second lens element unit is movably disposed along the optical axis, and the second lens element unit moves toward the image side along the optical axis, so that the lens assembly switches from an infinity state to a macro state
Data Source
AI summary
A lens assembly may include a first lens element unit and a second lens element unit that are arranged along an optical axis from an object side to an image side, and the second lens element unit may move along the optical axis toward the image side to switch the lens assembly between an infinity state and a macro state. In addition, focal powers of the first lens element unit and the second lens element unit and a focal power of a first lens element closest to the object side are properly allocated.