Three-Group Zoom Lens Assembly for Thin Camera Modules
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Solution Overview
Problem
Traditional optical zoom lenses are too long for thin and light camera devices like smartphones, preventing them from incorporating optical zoom functionality.
Innovation Solution
A lens assembly with a first, second, and third lens group, each with specific refractive powers and movements along the optical axis, allowing for a compact design with optical zoom capabilities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If traditional optical zoom lens structure is used, then optical zoom function is achieved, but total lens length becomes too long for thin camera devices
Solution Approach 1:
The lens assembly is divided into three distinct lens groups (first, second, and third lens groups) with different refractive powers. This segmentation allows each group to contribute differently to the overall optical function, enabling compact zoom capability by distributing the optical workload across multiple smaller components rather than requiring a single long lens element.
Solution Approach 2:
The patent arranges the three lens groups in a nested configuration along the optical axis, with the first lens group having positive refractive power, the second having negative refractive power, and the third having positive refractive power. This nested arrangement allows the lens assembly to achieve optical zoom function within a shortened total length by optimizing the spatial relationship and refractive contributions of each group.
2Length of moving object
If lens assembly is shortened for thin camera devices, then device thickness is reduced, but optical performance and resolution may deteriorate
Solution Approach 1:
Each lens group is assigned a specific refractive power characteristic (positive, negative, positive) to optimize its local optical function. The first and third lens groups with positive refractive power provide converging power, while the second lens group with negative refractive power provides diverging power. This local quality differentiation allows the compact assembly to maintain high optical resolution by ensuring each component contributes optimally to the overall image quality.
Solution Approach 2:
The patent optimizes specific parameter relationships between the lens groups, including the ratio of focal lengths and the spacing between groups. By carefully controlling parameters such as the focal length of each group and their relative positions, the system achieves both shortened total length and maintained optical resolution through precise parameter optimization rather than simply reducing size.
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 a shortened total length, increased resolution, and effective optical performance with zoom magnification ranging from 2 to 10 times, suitable for thin camera devices.
Implementation Method 1
The first lens group is with positive refractive power, the second lens group is with negative refractive power, and the third lens group is with positive refractive power
Data Source
AI summary
A lens assembly includes a first lens group, a second lens group, and a third lens group, all of which are arranged in order from a first side to a second side along an optical axis. The first lens group is with positive refractive power. The second lens group is with positive refractive power. The third lens group is with positive refractive power. The first lens group is fixed, the second lens group can move along the optical axis, and the third lens group can move along the optical axis, so that the lens assembly is zoomed from a wide-angle end to a telephoto end to change an effective focal length.