Compact Zoom Lens Assembly With Moving Lens Groups
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Solution Overview
Problem
Compact and lightweight electronic devices face challenges in enhancing camera performance, particularly in incorporating telephoto or zoom functions due to limited space.
Innovation Solution
A lens assembly comprising a first lens group with negative refractive power, a second lens group with positive refractive power that moves along the optical axis, and a third lens group with negative refractive power that moves back and forth, allowing for zooming while maintaining a compact design.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple lens assemblies are combined to enhance image quality and provide zoom function, then optical performance is improved, but device size and weight increase
Solution Approach 1:
The patent combines multiple lens groups (first lens group with negative refractive power, second lens group with positive refractive power, and third lens group with negative refractive power) into a single integrated lens assembly. This merging approach achieves zoom functionality and enhanced optical performance while maintaining a compact structure, avoiding the need for separate camera modules that would increase device weight.
Solution Approach 2:
The lens assembly employs a nested arrangement where the second lens group is positioned between the first and third lens groups along the optical axis. The lens groups are arranged in a compact nested configuration that allows efficient use of space, enabling the zoom function to be achieved within a smaller overall form factor without proportionally increasing device weight.
2Adaptability or versatility
If multiple lens assemblies are combined to provide telephoto or zoom function, then zoom capability is improved, but device volume increases
Solution Approach 1:
The patent implements zoom capability through dynamic movement of the second lens group along the optical axis. The second lens group, which has positive refractive power, is configured to move between the first and third lens groups to adjust the focal length and achieve zoom functionality. This dynamic arrangement allows the lens assembly to provide variable magnification without requiring a large fixed volume, as the zoom mechanism utilizes controlled displacement of specific lens groups within a compact structure.
3Adaptability or versatility
If lens groups are moved along optical axis to achieve zooming, then focal length is increased, but structural complexity increases
Solution Approach 1:
The lens assembly is segmented into three distinct lens groups with specific refractive power characteristics: the first lens group with negative refractive power, the second lens group with positive refractive power, and the third lens group with negative refractive power. This segmentation allows each group to perform specific optical functions and enables independent movement of the second lens group for zooming, simplifying the control mechanism compared to moving all lenses simultaneously.
Solution Approach 2:
The patent assigns different refractive power characteristics to different lens groups to optimize their individual functions. The second lens group, positioned between the first and third lens groups, is specifically designed with positive refractive power and configured to move for zooming, while the first and third lens groups maintain negative refractive power. This local differentiation of optical properties enables effective focal length adjustment through controlled movement of only the second lens group, reducing the overall structural complexity.
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 enables a zoom function in a smaller form factor, facilitating integration into lightweight electronic devices and enhancing optical performance.
Implementation Method 1
the first lens group has a negative refractive power... the second lens group has a positive refractive power... the third lens group has a negative refractive power... during zooming, as at least one of the second lens group and the third lens group moves toward an object side, a focal length of the lens assembly increases
Data Source
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AI summary
According to some embodiments of the present disclosure, an electronic device comprises a processor and a lens assembly, wherein the lens assembly comprises an image sensor, a first lens group, a second lens group, and a third lens group, the first lens group has negative refractive power and includes at least two sheets of lenses, the second lens group moves in the optical axis direction between the first lens group and the image sensor while having a positive refractive power and includes at least two sheets of lenses, the third lens group advances/retreats in the optical axis direction between the second lens group and the image sensor while having negative refractive power and includes at least one sheet of a lens, and, in a zooming operation, the processor moves the second lens group and/or the third lens group toward an object so that the focal distance of the lens assembly can be increased.