Image Stabilizer Reference Position Adjustment for Lens Shake Compensation
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Solution Overview
Problem
In image pickup apparatuses, accurate image stabilization is compromised when the image stabilizing reference position for the lens barrel and camera body image stabilizers differ, particularly in large or heavy lens barrels where setting the front principal point is difficult, leading to inconsistent image stabilization performance.
Innovation Solution
An image pickup apparatus with a control unit that adjusts the image stabilizing reference position of the image sensor based on whether the lens apparatus includes an optical image stabilizing unit, using the inspecting radius of gyration to calculate and correct for both rotational and parallel movement shakes, ensuring accurate stabilization even when the reference position does not coincide with the front principal point.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the lens barrel is large and heavy, then the lens barrel can provide sufficient structural support, but it becomes difficult to set the front principal point to the rotation center during inspection, causing the image stabilizing reference position to deviate from the front principal point
Solution Approach 1:
The patent applies dynamics by making the image stabilizing reference position adjustable rather than fixed. The control unit dynamically changes the reference position based on whether the lens barrel includes an optical image stabilizing unit, allowing the system to adapt to different lens barrel configurations and sizes while maintaining accurate image stabilization
Solution Approach 2:
The patent changes the parameter of the image stabilizing reference position based on the lens barrel type. When a lens barrel with an optical image stabilizing unit is mounted, the reference position is set to match that unit's reference position rather than always using the front principal point, thereby resolving the contradiction between structural support and ease of setting
2Adaptability or versatility
If the image stabilizing reference position of the lens barrel differs from that of the camera body, then each stabilizer can be optimized for its specific configuration, but accurate image stabilization cannot be achieved during cooperative control
Solution Approach 1:
The patent implements universality by designing the camera body's image stabilizer to work with multiple types of lens barrels. By making the reference position configurable based on the mounted lens barrel type, the camera body stabilizer can universally accommodate both lens barrels with front principal point reference and those with alternative reference positions, maintaining accurate cooperative control across different configurations
Solution Approach 2:
The system dynamically adjusts the image stabilizing reference position of the camera body based on the detected lens barrel type. This dynamic adaptation allows the system to maintain measurement precision across different lens barrel configurations, resolving the contradiction between adaptability and accuracy
3Device complexity
If the front principal point is used as the image stabilizing reference position, then the conversion coefficient calculation is simplified for distant objects, but parallel movement shake is not properly compensated for finitely distant objects
Solution Approach 1:
The patent applies local quality by using different image stabilizing reference positions for different object distances. For distant objects, the front principal point is used as the reference position, simplifying the conversion coefficient calculation. For finitely distant objects, the reference position is adjusted to properly account for parallel movement shake, thereby achieving both simplicity and accuracy in appropriate contexts
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 approach maintains high image stabilization performance by dynamically adjusting the image stabilizing reference position and calculating shake corrections, ensuring accurate image stabilization regardless of the lens barrel's stabilizing reference position, thus preventing performance degradation.
Implementation Method 1
a driving amount of the image stabilizer is calculated by multiplying a shake amount (corresponding to an angular variation amount) of the image pickup apparatus obtained by an inertial sensor, such as a gyro sensor
Data Source
AI summary
An image pickup apparatus is mountable with a lens apparatus including a first optical image stabilizing unit configured to move an optical element that is a part of the imaging optical system, in a direction intersecting an optical axis of the imaging optical system. The image pickup apparatus includes an image sensor, a second optical image stabilizing unit configured to move the image sensor in a direction intersecting the optical axis, and a control unit configured to control the second optical image stabilizing unit based on an image stabilizing reference position of the first optical image stabilizing unit which is a reference position for an image stabilization of the first optical image stabilizing unit.