Dual-Group Lens Assembly for Wide-Aperture Macro Imaging
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Solution Overview
Problem
Existing camera modules in electronic devices struggle to achieve a wide aperture design, high magnification, and high resolution while maintaining a small size, particularly failing to meet the diverse shooting requirements of infinity and macro scenes effectively.
Innovation Solution
A lens assembly with a first lens group having positive focal power and a second lens group with negative focal power, arranged along an optical axis, where the focal lengths are assigned to achieve a wide aperture design, allowing for a small f-number and enabling movement for macro functionality, with controlled light intake and focal length adjustments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a wide aperture design is implemented to improve light intake for infinity scenes, then imaging quality and light intake are improved, but the lens assembly size and complexity increase
Solution Approach 1:
The lens assembly is divided into multiple lens groups (first lens group with positive focal power and second lens group with negative focal power) that can move independently along the optical axis. This segmentation allows the aperture to be adjusted by moving specific lens groups, enabling wide aperture for infinity scenes without permanently increasing the overall lens assembly size.
Solution Approach 2:
The lens assembly employs dynamic adjustment where the first lens group can move along the optical axis between different positions. When moving to the first position, the lens assembly achieves wide aperture for infinity scenes with high light intake. When moving to the second position, the lens assembly achieves macro functionality. This dynamic positioning allows the lens assembly to adapt its aperture size based on shooting requirements without permanently increasing size.
2Measurement precision
If the lens assembly is designed for macro functionality with high magnification, then resolution and magnification are improved, but the aperture becomes narrower reducing light intake
Solution Approach 1:
The lens assembly uses dynamic positioning of the first lens group to switch between infinity and macro modes. When positioned for macro shooting, the first lens group moves to the second position, changing the distance between lens groups to achieve high magnification and resolution. The aperture can be adjusted accordingly for each mode, allowing optimized light intake for infinity scenes and optimized resolution for macro scenes without compromise.
Solution Approach 2:
The lens assembly changes key parameters including focal length and aperture size by moving the first lens group between positions. For infinity scenes, the lens assembly achieves wide aperture (low f-number) for high light intake. For macro scenes, the lens assembly changes to a different focal length configuration that provides high magnification and resolution. This parameter adjustment allows optimization of either light intake or resolution based on the shooting requirement.
3Ease of manufacture
If the lens assembly uses a fixed structure to simplify design, then manufacturing and assembly are easier, but the ability to switch between infinity and macro modes is limited
Solution Approach 1:
The lens assembly incorporates a movable first lens group that can be positioned along the optical axis to switch between infinity and macro modes. This dynamic element is integrated into the lens barrel structure, allowing the lens assembly to adapt to different shooting requirements. The movable component is designed to work with the existing lens groups and aperture mechanism, maintaining manufacturing feasibility while adding versatility.
Solution Approach 2:
The lens assembly is designed to perform multiple functions - infinity shooting with wide aperture and macro shooting with high magnification - using a unified structure. The movable first lens group serves both modes by changing its position, eliminating the need for separate lens assemblies for different functions. This multi-functional design increases adaptability while keeping the overall structure relatively simple.
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 enhances imaging quality and effect by increasing light intake and resolution, supporting both infinity and macro scenes with improved depth of field and magnification, while maintaining a compact design.
Implementation Method 1
The lens assembly includes a first lens group and a second lens group that are sequentially arranged along an optical axis from an object side to an image side. Each lens group includes a plurality of lenses sequentially arranged along the optical axis.
Implementation Method 2
The first lens group has a positive focal power, and the second lens group has a negative focal power. The focal powers are properly assigned between the lens groups. This helps achieve a wide aperture design for the lens assembly.
Data Source
AI summary
The lens assembly includes a first lens group and a second lens group that are sequentially arranged along an optical axis from an object side to an image side. The first lens group and the second lens group have a positive focal power and a negative focal power respectively. A ratio of a focal length f1 of the first lens group to a focal length f2 of the second lens group satisfies 0.4<|f1/f2|<1.5. When the lens assembly switches from an infinity state to a macro state, the first lens group moves toward the object side along the optical axis, and a range of a movement distance of the first lens group is 1<L<3.5.