Zoom Lens Correction Unit Layout for Hand-Shake Blur Control
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Solution Overview
Problem
Existing zoom lenses face challenges in achieving a high zoom ratio, small size, and maintaining high optical performance with uniform resolution from the center to the periphery of the screen, while effectively correcting image blurring due to hand shake without increasing aberrations.
Innovation Solution
A zoom lens configuration with a plurality of lens units, including a correction lens unit composed of subunits with specific refractive powers, moves in a direction perpendicular to the optical axis to correct image blurring, and adheres to specific focal length ratios to ensure high zoom ratio and optical performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a partial lens system is moved perpendicular to the optical axis for image blurring correction, then image blurring is corrected, but decentering aberration increases
Solution Approach 1:
The correction lens unit is divided into multiple subunits (first subunit, second subunit, third subunit) with different refractive powers. By segmenting the correction function across multiple subunits, the patent achieves effective image blurring correction while controlling decentering aberration, as each subunit contributes differently to the overall correction effect
Solution Approach 2:
Different subunits within the correction lens unit are assigned different refractive powers (positive, positive, negative). This local differentiation of optical properties allows the system to correct image blurring effectively while minimizing the increase in decentering aberration that would occur with a uniform lens design
2Weight of moving object
If the correction lens unit is made small and lightweight, then the movement mechanism size is reduced and power is saved, but aberration control becomes more difficult
Solution Approach 1:
The patent specifies precise refractive power parameters for each subunit (first subunit: positive, second subunit: positive, third subunit: negative) and defines the relationship between the focal length of the correction lens unit and the zoom lens through conditional expressions. These parameter constraints enable compact design while maintaining aberration control
3Adaptability or versatility
If a high zoom ratio is achieved, then the lens can cover more focal length range, but optical performance and resolution uniformity deteriorate
Solution Approach 1:
The zoom lens is divided into multiple lens units (first lens unit, second lens unit, third lens unit, correction lens unit, and rear group) with specific refractive power configurations. This segmentation allows independent optimization of each unit's function, enabling high zoom ratio while maintaining uniform resolution across the image field
Solution Approach 2:
The correction lens unit serves multiple functions: it corrects image blurring through perpendicular movement and simultaneously contributes to maintaining optical performance across the zoom range. The coordinated movement of lens units during zooming allows the system to achieve high adaptability while preserving image quality
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 achieves a high zoom ratio, maintains optical performance, and effectively corrects image blurring while minimizing aberrations, ensuring a compact design.
Implementation Method 1
a mechanism (image stabilization mechanism) to compensate blurring of a picture image (image blurring) that occurs when accidental vibration such as hand shake is propagated to the zoom lens
Implementation Method 2
a plurality of lens units in which an interval between adjacent lens units is varied during zooming
Data Source
AI summary
A zoom lens according to the present invention includes, in order from an object side to an image side, first to third lens units with positive, negative and positive refractive powers, and a rear group including two or more lens units, in which an interval between adjacent lens units is varied during zooming. The zoom lens includes a correction lens unit which has a function of moving an imaging position in a direction perpendicular to an optical axis. The correction lens unit includes, in order from the object side to the image side, a positive first subunit, a positive second subunit which moves in a direction having a component of the direction perpendicular to the optical axis, and a negative third subunit. Focal lengths of the zoom lens when focused at infinity at a wide angle end and the correction lens unit are appropriately set.