Four-Group Zoom Lens Design for Continuous Imaging Definition
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional hybrid optical zoom lenses in terminal devices suffer from poor imaging quality due to limited definition when the focal length is between different focal lengths, leading to a 'jump-type zoom' effect.
Innovation Solution
A zoom lens design comprising a first, second, and third lens group fixedly disposed, with a second and fourth lens group moving along the optical axis to implement continuous zoom and aberration compensation, using a biconvex lens for improved light convergence and glass lenses for optical path adjustment, and setting the maximum clear aperture diameter between 4 mm to 12 mm to enhance imaging quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If hybrid optical zoom lens is used with multiple lenses of different focal lengths, then wide-angle zoom and telephoto zoom coverage is improved, but imaging definition and imaging quality deteriorate when focal length is between different focal lengths
Solution Approach 1:
The zoom lens is divided into four lens groups with specific functions: first lens group (fixed, positive focal length) for light convergence, second lens group (movable, negative focal length) for zooming, third lens group (fixed, positive focal length) for aberration correction, and fourth lens group (movable, negative focal length) for additional aberration compensation. This segmentation allows continuous zoom while maintaining imaging quality.
Solution Approach 2:
The second and fourth lens groups are designed to move dynamically along the optical axis during zooming operations. The second lens group moves to achieve zooming effect, while the fourth lens group moves synchronously to compensate for aberrations, enabling smooth transition between focal lengths without loss of imaging definition.
2Adaptability or versatility
If traditional zoom lens structure is used, then zoom function is achieved, but overall height and device thickness increase
Solution Approach 1:
The patent combines multiple lens groups with different focal lengths and functions into a single integrated zoom lens structure. By merging the first and third lens groups (fixed, positive focal length) with the second and fourth lens groups (movable, negative focal length), the design achieves compact arrangement that reduces overall height while maintaining zoom functionality.
Solution Approach 2:
The lens groups are arranged in a nested configuration where the second and fourth lens groups are positioned between the first and third lens groups along the optical axis. This nested arrangement allows the movable lens groups to be contained within the space defined by the fixed lens groups, significantly reducing the overall height of the zoom lens.
3Reliability
If more lens groups are added to improve imaging quality, then aberration compensation is improved, but device complexity increases
Solution Approach 1:
Each lens group is designed with specific local functions: the first and third lens groups have positive focal lengths for light convergence and aberration correction, while the second and fourth lens groups have negative focal lengths for zooming and aberration compensation. This local specialization of functions allows four lens groups to work together efficiently without excessive complexity.
Solution Approach 2:
The second and fourth lens groups act as intermediary elements that move synchronously during zooming to balance the optical path. The fourth lens group specifically serves as a compensatory intermediary that counteracts aberrations introduced by the second lens group, maintaining imaging quality while managing system 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 solution maintains good imaging definition and reduces the overall height of the zoom lens, enabling continuous zoom with improved luminous flux and miniaturization, suitable for use in thin terminal devices.
Implementation Method 1
A first lens from the object side in the first lens group is a biconvex lens. This can improve light converging performance of the first lens group
Implementation Method 2
the second lens group and the fourth lens group move along the optical axis at the same time, to implement zoom and compensation for an aberration generated during zoom
Data Source
AI summary
A zoom lens includes a first lens group, a second lens group, a third lens group, and a fourth lens group that are sequentially arranged from an object side to an image side along an optical axis. The first lens group and the third lens group are fastened, and the second lens group and the fourth lens group move along the optical axis. A first lens from the object side in the first lens group is a biconvex lens, and at least two lenses from the object side in the first lens group are glass lenses. A maximum clear aperture diameter of the zoom lens has the following relationship of 4 mm≤φ≤12 mm, where φ is the maximum clear aperture diameter of the zoom lens.