Image Shake Correction Magnet Arrangement for Position Detection Accuracy
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Solution Overview
Problem
Existing image shake correction devices face challenges in improving position detection accuracy due to magnetic field disturbances from adjacent magnets, leading to degraded performance in correcting image shake.
Innovation Solution
The solution involves providing separate drive magnets and position detection magnets for the movable member, with the latter positioned to avoid magnetic field interference, ensuring accurate position detection by arranging the same poles of adjacent magnets to face each other.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If four or more magnets are arranged for drive and position detection, then the image shake correction function is enabled, but the magnetic field of the position detection magnet is disturbed by adjacent magnets, degrading position detection performance
Solution Approach 1:
The patent segments the magnet array into distinct drive magnets and position detection magnets, with position detection magnets arranged at intervals rather than continuously. This segmentation reduces magnetic field interference between adjacent position detection magnets while maintaining sufficient coverage for accurate position detection across the movable member's range of motion.
Solution Approach 2:
The patent introduces non-magnetic materials or structural elements as intermediaries between adjacent magnets, particularly between position detection magnets. These intermediaries shield or isolate the magnetic fields, preventing disturbance to position detection accuracy while allowing the drive magnets to function effectively.
2Measurement precision
If drive magnets and position detection magnets are separately provided, then position detection accuracy is improved, but the device complexity increases due to additional components
Solution Approach 1:
The patent merges the drive magnets and position detection magnets into a single integrated magnet array structure on the movable member. Both types of magnets are arranged in alternating patterns or interleaved configurations, sharing common mounting structures and magnetic circuit elements, thereby reducing overall device complexity while maintaining separate functional zones.
Solution Approach 2:
The patent designs the magnet array to serve multiple functions: certain magnets function as drive magnets for actuation while simultaneously serving as reference points for position detection, or the same structural framework supports both drive and detection magnets. This multi-functionality reduces the number of separate components needed.
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 enhances the correction accuracy of image shake by improving position detection accuracy, stabilizing magnetic fields, and maintaining drive performance, thereby improving overall image stabilization.
Implementation Method 1
a plurality of drive coils that is fixed to one of the movable member and the support member to move the movable member in the plurality of directions
Implementation Method 2
a plurality of position detectors that is fixed to one of the movable member and the support member to detect a position of the movable member in the plurality of directions
Data Source
AI summary
There are provided an image shake correction device capable of improving correction accuracy of image shake by improving position detection accuracy of a movable member, and an imaging device including the image shake correction. An image shake correction device 3 includes a support member 1 that supports a movable member 2 to be movable in a plurality of directions along a flat surface, drive coils C1 to C3 fixed to the movable member 2, Hall elements H1 to H3 fixed to the movable member 2, drive magnets Mv1 to Mv3 fixed to the support member 1, and position detection magnets Mh1 to Mh3. In a case where two adjacent magnets of all the magnets including the drive magnets Mv1 to Mv3 and the position detection magnets Mh1 to Mh3 are focused as viewed in a direction Z perpendicular to the flat surface, the same poles of the two magnets face each other.