Zoom Lens Assembly Linear Focal Length Adjustment
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Solution Overview
Problem
Current mobile phone camera lens assemblies primarily rely on digital focal length zooming, resulting in pixel loss and failing to meet the diverse shooting needs of users, as they can only achieve focal length zooming by changing a specific focal length value, which is not sufficient for continuous optical zoom functionality.
Innovation Solution
A zoom lens assembly comprising four lens groups with eight lenses, where at least one lens in each group is an aspheric lens, allowing for continuous optical zoom by changing the positions of the second, third, and fourth lens groups along the optical axis, enabling a linear change in focal length from wide-angle to telephoto states.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If digital focal length zooming is used, then the device complexity is reduced, but the imaging quality deteriorates due to pixel loss
Solution Approach 1:
The patent implements continuous optical zoom by making the lens groups dynamically movable along the optical axis. The second, third, and fourth lens groups can move relative to each other, enabling continuous adjustment of focal length from wide-angle to telephoto states, thereby achieving dynamic zooming with high imaging quality without digital pixel loss.
Solution Approach 2:
The zoom lens assembly is divided into four distinct lens groups with different refractive powers. This segmentation allows each group to be independently positioned along the optical axis, enabling precise control over the optical path and focal length adjustment, thus achieving continuous zoom while maintaining image quality.
2Adaptability or versatility
If continuous optical zoom is implemented, then the adaptability is improved, but the device complexity increases
Solution Approach 1:
The zoom lens assembly achieves multi-functionality by enabling continuous focal length adjustment from wide-angle to telephoto states within a single compact structure. The four lens groups work together to provide versatile shooting capabilities for different scenarios, replacing the need for multiple separate lens modules.
Solution Approach 2:
The patent achieves continuous zoom by changing the positional parameters of the lens groups along the optical axis. By adjusting the distances between the second, third, and fourth lens groups, the focal length can be continuously varied, providing adaptability without requiring complex mechanical structures.
3Manufacturing precision
If multiple lens groups are used for zooming, then the imaging quality is improved, but the length of the device increases
Solution Approach 1:
The patent employs a nested arrangement where the second, third, and fourth lens groups are positioned in sequence along the optical axis within a compact space. The lens groups overlap in their movement ranges, allowing them to nest within each other's operational zones, thereby reducing the overall length of the lens assembly while maintaining multiple lens groups for high imaging quality.
Solution Approach 2:
Instead of extending the lens assembly length linearly, the patent utilizes the optical axis dimension efficiently by arranging lens groups to move in coordinated fashion. The compact design achieves zoom functionality by optimizing the spatial arrangement along the optical axis rather than increasing overall device length.
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 solution provides a continuous focal length zooming capability from 13.91 mm to 23.03 mm, maintaining good imaging quality with reduced aberrations and a compact size, suitable for portable electronic devices.
Implementation Method 1
a first lens group, comprising a first lens and a second lens; a second lens group having a positive refractive power, the second lens group comprising a third lens, a fourth lens and a fifth lens; a third lens group having a negative refractive power, the third lens group comprising a sixth lens; and a fourth lens group having a positive refractive power, the fourth lens group comprising a seventh lens and an eighth lens, where at least one of the first lens to the eighth lens is an aspheric lens
Data Source
AI summary
The present disclosure discloses a zoom lens assembly. The zoom lens assembly comprises, sequentially along an optical axis from an object side to an image side, a first lens group comprising a first lens and a second lens; a second lens group having a positive refractive power and comprising a third lens, a fourth lens and a fifth lens; a third lens group having a negative refractive power and comprising a sixth lens; and a fourth lens group having a positive refractive power and comprising a seventh lens and an eighth lens. At least one of the first lens to the eighth lens is an aspheric lens. By changing positions of at least two lens groups in the second lens group, the third lens group and the fourth lens group on the optical axis, the zoom lens assembly switches between a wide-angle state and a telephoto state, and a focal length of the zoom lens assembly changes linearly when the zoom lens assembly switches from the wide-angle state to the telephoto state.