Zoom Lens Orthogonal Stabilization Sub-Unit
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Solution Overview
Problem
Existing zoom lenses face challenges in achieving high optical performance over the entire zoom range while maintaining a compact size, as improper selection of image stabilizing units leads to increased aberration variation and degraded optical performance due to tilt errors during lens assembly.
Innovation Solution
A zoom lens configuration with specific refractive powers and movements, including a first lens unit with positive power, a second with negative power, a third with positive power, and a fourth with positive power, where the third lens unit includes a sub-unit with negative power that moves orthogonally to the optical axis for image stabilization, satisfying conditional expressions to optimize focal lengths and magnification ratios.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If a compact zoom lens configuration is adopted to reduce overall lens length and lens barrel diameter, then the size is reduced, but it becomes difficult to maintain high optical performance over the entire zoom range and properly implement image stabilization
Solution Approach 1:
The third lens unit is divided into a positive power sub-unit and a negative power sub-unit, allowing independent optimization of each sub-unit's function. This segmentation enables the negative power sub-unit to be specifically designated for image stabilization while the positive power sub-unit maintains focusing capability, resolving the conflict between compact size and optical performance by distributing functions across segmented components.
Solution Approach 2:
The image stabilization is achieved through dynamic movement of the negative power sub-unit within the third lens unit in the sub-unit moving direction, which is set to include a component orthogonal to the optical axis. This dynamic configuration allows the compact lens to maintain high optical performance by actively compensating for image blur without requiring additional lens elements that would increase overall size.
2Device complexity
If an improper image stabilizing unit is selected, then the lens structure is simplified, but aberration variation increases and optical performance degrades due to tilt errors during lens assembly
Solution Approach 1:
The negative power sub-unit within the third lens unit is specifically designed with localized negative refractive power to counteract image blur caused by tilt errors. This local quality approach places the correction function exactly where needed within the lens structure, maintaining simplicity while achieving precise aberration control that would be difficult to obtain with more complex overall lens designs.
Solution Approach 2:
The negative power sub-unit acts as an intermediary element within the third lens unit that mediates between the positive power sub-unit and the image plane. It specifically addresses tilt-induced aberrations by introducing compensating negative power in a controlled manner, allowing the overall lens structure to remain simple while achieving high manufacturing precision through this intermediate corrective element.
3Reliability
If the third lens unit is configured with a negative power sub-unit for image stabilization, then image blur correction is improved, but the lens barrel diameter may increase
Solution Approach 1:
The image stabilization function is merged into the third lens unit by incorporating a negative power sub-unit within it, rather than adding a separate dedicated stabilization unit. This merging allows the stabilization mechanism to share the same optical path and physical space as the existing lens units, improving image blur correction while avoiding the penalty of increased lens barrel diameter that would result from adding a separate stabilization subsystem.
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
This configuration enables high optical performance over the entire zoom range while reducing the overall lens length and lens barrel diameter, effectively minimizing aberration variation and maintaining image stabilization performance.
Implementation Method 1
The third lens unit includes a sub-unit having a negative refractive power as a whole that moves in a direction including a component orthogonally to an optical axis for image blur correcting
Implementation Method 2
a first lens unit having a positive refractive power, a second lens unit having a negative refractive power, a third lens unit having a positive refractive power, and a fourth lens unit having a positive refractive power
Data Source
AI summary
A zoom lens comprising, in order from an object side to an image side, a first lens unit having a positive refractive power, a second lens unit having a negative refractive power, a third lens unit having a positive refractive power, and a fourth lens unit having a positive refractive power an interval between adjacent lens units changing and the first to fourth lens units moving during zooming. An image blur is corrected by moving a sub-unit having a negative refractive power as a whole in the third lens unit orthogonally to an optical axis. A predetermined conditions are satisfied.