Imaging Lens System with Movable Second Group for Near-Far Capture
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Solution Overview
Problem
Existing camera modules with fixed focal length imaging lens systems struggle to capture images of subjects at varying distances, as they are limited to a specific range, making it difficult to image subjects both near and far.
Innovation Solution
The proposed imaging lens system consists of a first lens group and a second lens group, where the second lens group is movable along the optical axis. This system satisfies specific conditional expressions, such as TTL/(ImgHT*2) < 0.850, to enable capturing images of subjects at both close and distant ranges.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a fixed focal length imaging lens system is used, then the device complexity is reduced, but the adaptability to capture subjects at varying distances deteriorates
Solution Approach 1:
The patent applies the dynamics principle by making the second lens group movable along the optical axis. This allows the lens system to adjust its focal length dynamically, enabling capture of subjects at both near and far distances while maintaining a relatively simple overall structure. The movable second lens group transforms the fixed focal length limitation into a variable focal length capability without requiring a completely complex zoom mechanism.
2Volume of moving object
If the imaging lens system is made compact for portable devices, then the volume is reduced, but the ability to capture both near and far subjects deteriorates
Solution Approach 1:
The patent applies segmentation by dividing the imaging lens system into two distinct lens groups: a first lens group and a second lens group. The second lens group is configured to be movable relative to the first lens group along the optical axis. This segmentation allows for a compact overall structure while enabling focal length adjustment through the relative movement of the segmented lens groups, thus capturing both near and far subjects within a small volume suitable for portable devices.
3Adaptability or versatility
If a movable second lens group is introduced to capture varying distances, then the adaptability improves, but the device complexity increases
Solution Approach 1:
The patent applies parameter changes by configuring the second lens group to be movable along the optical axis, thereby changing the effective focal length parameter of the lens system. This simple parameter change (adding movability) enables the system to capture subjects at both near and far distances. The conditional expressions provided in the patent further optimize this configuration to achieve the desired adaptability while controlling 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 imaging lens system effectively captures high-resolution images of subjects at various distances, from near to far, by adjusting the position of the second lens group, thereby overcoming the limitations of fixed focal length systems.
Implementation Method 1
an imaging lens system includes a first lens group comprising one or more lenses; and a second lens group, comprising one or more lenses and configured to be movable in an optical axis direction
Implementation Method 2
The foremost lens may have a convex image-side surface. A rear lens in the first lens group disposed closest to the second lens group may have a convex image-side surface
Data Source
AI summary
An imaging lens system is provided. The imaging lens system includes a first lens group including one or more lenses, and a second lens group including one or more lenses and configured to be movable in an optical axis direction. The first lens group and the second lens group are sequentially arranged from an object side toward an imaging plane. The imaging lens system satisfies the conditional expression TTL/(ImgHT*2)<0.850, where TTL is a distance from an object-side surface of a foremost lens disposed closest to an object, to the imaging plane, and ImgHT is a height of the imaging plane.