Three-Group Lens Assembly with Lateral Image Stabilization
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Solution Overview
Problem
Traditional long focal length lens assemblies have longer total lens lengths, which are prone to shake, affecting image quality, and lack optical image stabilization, failing to meet modern requirements for miniaturization, high resolution, and stabilization.
Innovation Solution
A lens assembly comprising a first lens group with positive refractive power, a second lens group capable of moving perpendicular to the optical axis for image stabilization, and a third lens group moving along the optical axis for focusing, with specific lens configurations and materials to ensure miniaturization and high resolution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional long focal length lens assembly is used, then focal length is achieved, but total lens length becomes longer and shake impact on image quality increases
Solution Approach 1:
The lens assembly is divided into three distinct lens groups (first lens group with positive refractive power, second lens group with negative refractive power, and third lens group with negative refractive power), each serving specific optical functions. This segmentation allows the system to achieve long focal length while maintaining compact overall length by distributing optical power across multiple groups rather than using a single long lens element.
Solution Approach 2:
The second lens group is configured to move perpendicular to the optical axis for optical image stabilization, introducing a lateral movement dimension. This allows the system to compensate for shake effects without increasing the axial length of the lens assembly, effectively addressing the contradiction between compact length and image quality stability.
2Reliability
If traditional long focal length lens assembly is used, then focal length is achieved, but optical image stabilization is lacking
Solution Approach 1:
The second lens group with negative refractive power is designed to move laterally perpendicular to the optical axis for optical image stabilization. This dynamic configuration allows the lens assembly to actively compensate for shake effects during operation, providing reliability without requiring a completely complex stabilization system.
Solution Approach 2:
The second lens group serves multiple functions: it contributes to the overall focal length through its negative refractive power and simultaneously provides optical image stabilization through its lateral movement capability. This multi-functionality reduces the need for separate stabilization components, managing device complexity while achieving reliability.
3Length of stationary object
If lens assembly is miniaturized, then total lens length is reduced, but resolution and optical performance may be compromised
Solution Approach 1:
By segmenting the lens assembly into three groups with specific refractive powers (positive, negative, negative), the system achieves compact miniaturization while maintaining high resolution. Each lens group contributes to correcting specific aberrations and maintaining image quality, ensuring that resolution is not compromised despite the reduced total length.
Solution Approach 2:
The patent specifies particular refractive power relationships between lens groups and surface shape configurations (convex/concave surfaces) to optimize optical performance in a compact form. These parameter changes enable the miniaturized lens assembly to maintain high resolution and correct chromatic aberration effectively.
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 reduced total lens length, enhanced resolution, and effective optical image stabilization, correcting aberrations and chromatic aberration while maintaining good image quality.
Implementation Method 1
The first lens group is with positive refractive power and includes at least four lenses arranged in order from the object side to the image side along the optical axis
Implementation Method 2
The second lens group is with negative refractive power and includes a 2-1 lens and a 2-2 lens, wherein the 2-2 lens includes a convex surface facing the image side. The second lens group can move along the direction perpendicular to the optical axis to achieve optical image stabilization
Implementation Method 3
The third lens group is with negative refractive power and includes a 3-1 lens, wherein the 3-1 lens is a meniscus lens with negative refractive power. The third lens group can move along the optical axis for focusing
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 an object side to an image side along an optical axis. The first lens group is with positive refractive power and includes at least four lenses, among which the lens closest to the object side includes a convex surface facing the object side, and the lens closest to the image side includes a convex surface facing the image side. The second lens group is with negative refractive power and includes a 2-1 lens and a 2-2 lens, wherein the 2-2 lens includes a convex surface facing the image side. The third lens group is with negative refractive power and includes a 3-1 lens, wherein the 3-1 lens is a meniscus lens with negative refractive power.