Zoom Lens Correction Subunits for Blur Stabilization and Aberration Control
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Solution Overview
Problem
Existing zoom lenses face challenges in achieving a high zoom ratio, small size, and high optical performance with uniform resolution across the screen, while also effectively correcting image blurring due to vibrations without increasing aberrations.
Innovation Solution
A zoom lens configuration with specific refractive power arrangements and a correction lens unit comprising subunits with positive and negative refractive powers, moving perpendicular to the optical axis, and adhering to certain focal length ratios to maintain optical performance and stability.
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 and optical performance degrades
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 elements rather than moving a single partial lens system, the patent reduces decentering aberration while maintaining image blurring correction capability. Each subunit contributes to the overall correction effect, distributing the optical burden and minimizing aberration generation.
Solution Approach 2:
Different subunits within the correction lens unit have different local optical properties (positive and negative refractive powers). The first subunit has positive refractive power, the second has negative refractive power, and the third has positive refractive power. This local quality differentiation allows each subunit to correct specific types of aberrations, balancing the overall optical performance during image blurring correction.
2Reliability
If the correction lens unit is moved perpendicular to the optical axis, then image blurring is corrected, but the movement mechanism size and weight increase
Solution Approach 1:
The correction lens unit is designed to move dynamically perpendicular to the optical axis during image blurring correction, rather than being fixed. This dynamic positioning allows the lens unit to compensate for hand shake and vibrations by adjusting its position in real-time, correcting image blurring while maintaining a relatively compact mechanism through controlled movement rather than oversized static structures.
3Manufacturing precision
If chromatic aberration is corrected in the correction lens unit, then optical performance is improved, but the lens configuration becomes more complex
Solution Approach 1:
The patent specifies particular parameter ranges for the correction lens unit, including the focal length ratio (0.05 < f_corr/fw < 0.35) and the refractive power distribution among subunits. By optimizing these parameters within defined ranges, the patent achieves effective chromatic aberration correction and overall optical performance improvement while controlling the complexity of the lens configuration through systematic parameter management rather than arbitrary complex arrangements.
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 enables a zoom lens with a high zoom ratio, small size, and high optical performance, effectively correcting image blurring while minimizing aberrations and maintaining uniform resolution across the zoom range.
Implementation Method 1
a correction lens unit which moves in a direction having a component of a direction perpendicular to an optical axis during image blurring correction
Implementation Method 2
a first lens unit with a positive refractive power, a second lens unit with a negative refractive power, a third lens unit with a positive refractive power
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.