Zoom Lens Group Configuration for Seamless Focal Switching
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Solution Overview
Problem
Current digital zoom technologies compromise image quality when increasing the captured scene size, and hybrid zoom modes require adjustments in lens parameters for focus length changes, making them impractical for seamless switching between short-focus and telephoto states.
Innovation Solution
A zoom lens configuration with a first lens group of negative focal power, a second group of positive focal power, and a third group of negative focal power, where the second and third groups are movable relative to the first group, satisfying the formula −2.5<F1/F2<−1.5 and −2<F3/F2<−1, allowing for focal distance changes without multiple lenses and maintaining image clarity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If digital zoom mode is used to enlarge the captured scene, then the field of view is increased, but the image quality deteriorates
Solution Approach 1:
The patent implements a dynamic zoom lens system where the second and third lens groups move relative to the first lens group to change the focal length. This mechanical movement allows the optical system to dynamically adjust between wide-angle and telephoto states, maintaining high image quality throughout the zoom range without relying on digital zoom interpolation.
Solution Approach 2:
The patent changes the optical parameters of the lens system by moving the second and third lens groups to different positions. The focal length is varied from a first focal length to a second focal length through physical displacement of lens groups, enabling continuous zoom while preserving optical image quality across the entire range.
2Manufacturing precision
If hybrid zoom mode is used to improve image quality, then the image clarity is enhanced, but the device complexity increases due to multiple lenses required for switching
Solution Approach 1:
The zoom lens system is divided into three distinct lens groups: a first lens group with negative focal power, a second lens group with positive focal power, and a third lens group with negative focal power. The second and third lens groups are movable relative to the first lens group, allowing independent adjustment of each group to achieve zoom functionality while maintaining a relatively compact and manageable structure.
3Adaptability or versatility
If multiple lenses are used for seamless switching between short-focus and telephoto states, then the zoom capability is improved, but the ease of manufacture decreases
Solution Approach 1:
The patent implements a dynamic zoom lens system where the second and third lens groups move relative to the first lens group to change the focal length. This mechanical movement allows the optical system to dynamically adjust between wide-angle and telephoto states, maintaining high image quality throughout the zoom range without relying on digital zoom interpolation.
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
Enables clear image capture with the ability to switch between short-focus and telephoto states without compromising image quality, facilitating production and assembly, and reducing the need for multiple lenses.
Implementation Method 1
a first lens group, having a negative focal power
Implementation Method 2
a second lens group, having a positive focal power
Implementation Method 3
a third lens group, having a negative focal power
Data Source
AI summary
A zoom lens (10), a camera module (100) and an electronic device (1000). The zoom lens (10) comprises a first lens group (11) with negative focal power, a second lens group (12) with positive focal power, and a third lens group (13) with negative focal power, wherein both the second lens group (12) and the third lens group (13) can move relative to the first lens group (11); the following relations are met: −2.5<FI/F2<−1.5, and −2<F3/F2<−1.