Tilted Stabilizing Lens for Peripheral Blur Correction
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Solution Overview
Problem
Existing image stabilization methods fail to adequately correct image blur in both the central and peripheral areas of an image, often leading to insufficient correction or overcorrection, particularly in wide-angle optical systems.
Innovation Solution
Incorporating an image stabilizing lens unit that can tilt relative to the optical axis, combined with sensor shift or image processing, to correct image blur in both central and peripheral areas.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If image stabilization is performed by moving the image sensor or shifting a cut-out area, then image blur in the central area can be sufficiently corrected, but image blur in the peripheral area remains uncorrected or is overcorrected
Solution Approach 1:
The patent applies local quality by making different parts of the optical system perform different functions: the image stabilizing lens unit with negative refractive power is positioned to specifically address peripheral area blur, while the image sensor shift handles central area stabilization. This localized functional differentiation allows simultaneous optimization for both central and peripheral correction.
Solution Approach 2:
The patent segments the image stabilization function into two components: (1) image sensor shifting for central area correction, and (2) an additional image stabilizing lens unit for peripheral area correction. This segmentation allows each component to specialize in correcting blur in its respective region without interfering with the other.
2Volume of moving object
If a lens unit with positive refractive power is used for image stabilization, then the optical system can be compact, but the lens unit cannot be tilted without causing aberration
Solution Approach 1:
The patent changes the key parameter of refractive power from positive to negative for the image stabilizing lens unit. This parameter change enables the lens unit to be tilted for peripheral correction while maintaining aberration control, solving the contradiction between compactness and aberration control during tilting operations.
Solution Approach 2:
Instead of using a positive refractive power lens unit that would cause aberration when tilted, the patent inverts the approach by using a negative refractive power lens unit. This inversion allows the lens unit to be tilted effectively for peripheral area correction while maintaining optical quality.
3Measurement precision
If the focal length of the image stabilizing lens unit is made very short to improve peripheral correction, then peripheral blur correction improves, but distortion increases and the lens unit cannot be positioned close to the aperture stop
Solution Approach 1:
The patent carefully controls the focal length parameter of the image stabilizing lens unit, setting it within a specific range (0.05f to 0.3f) rather than using an extremely short focal length. This parameter optimization achieves effective peripheral correction while limiting distortion to acceptable levels and enabling proper positioning relative to the aperture stop.
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
Effectively corrects image blur in both central and peripheral areas, reducing distortion and improving image stabilization performance.
Implementation Method 1
an image stabilizing lens unit rotatable so as to tilt relative to an optical axis of the optical system
Data Source
AI summary
An optical system for use with an image pickup apparatus configured to perform an image stabilizing operation by moving an image sensor configured to image an object or by moving a cut-out area in an image generated using a signal from the image sensor includes an image stabilizing lens unit rotatable so as to tilt relative to an optical axis of the optical system, and at least one negative lens.