Actuator Magnet Polarization for Imaging Device Position Detection
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Solution Overview
Problem
Existing electromagnetic actuators with magnetized magnets having three or more poles face limitations in design flexibility due to restricted layout of coils and magnetism detection elements, affecting drive performance in imaging devices.
Innovation Solution
An actuator design featuring a magnet with specific polarization lines and a magnetism detection element configuration, where the magnet moves relative to the coil, with the magnetism detection element positioned to optimize position detection accuracy and drive force, allowing for increased design latitude and improved drive performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a magnet with three or more magnetic poles is used to increase design latitude, then the layout flexibility of coil and magnetism detection element is improved, but the drive performance and position detection accuracy deteriorate
Solution Approach 1:
The magnet is designed with non-uniform magnetic pole arrangements and varying magnetic flux densities in different regions. Specifically, the magnetic flux density distribution is optimized locally to ensure that despite having multiple poles for design flexibility, the magnetism detection element receives sufficient magnetic signal strength for accurate position detection. Different regions of the magnet have tailored magnetic properties to satisfy both layout flexibility and detection accuracy requirements.
Solution Approach 2:
The patent optimizes key parameters including the distance between the magnetism detection element and the magnet (set to 0.5-2.0 times the magnet thickness), the magnetic pole arrangement, and the magnetic flux density distribution. By carefully adjusting these parameters, the system achieves both design latitude from multi-pole configuration and adequate position detection accuracy through optimized magnetic field characteristics.
2Measurement precision
If the magnetism detection element is positioned closer to the magnet to improve detection accuracy, then position detection accuracy is improved, but the drive force generated by the coil deteriorates
Solution Approach 1:
The magnetic circuit is segmented into distinct functional zones: a detection zone near the magnet where the magnetism detection element operates with high magnetic flux density for accurate position sensing, and a drive zone where the coil generates magnetic force. This spatial segmentation allows the magnetism detection element to be positioned close to the magnet for accurate detection while the coil operates in a region optimized for generating drive force, thus resolving the contradiction between detection accuracy and drive force.
Solution Approach 2:
The system transitions from a one-dimensional trade-off (distance affecting both detection and drive) to a multi-dimensional solution by optimizing the three-dimensional spatial arrangement. The magnetism detection element is positioned at an optimal distance (0.5-2.0 times magnet thickness) to detect magnetic field changes accurately, while the coil is arranged in a configuration that generates sufficient drive force. The magnetic pole arrangement and flux density distribution are optimized in multiple dimensions to satisfy both requirements simultaneously.
3Measurement precision
If the distance from the second polarization line to the first end of the magnet is increased to improve position detection accuracy, then position detection accuracy is improved, but the overall size of the actuator increases
Solution Approach 1:
The first end of the magnet serves multiple functions: it provides the detection surface for the magnetism detection element positioned at an optimized distance (0.5-2.0 times magnet thickness) for accurate position sensing, and it maintains a compact overall structure. The second polarization line is positioned such that the distance to the first end (1.25 times predetermined amount) creates an optimal magnetic field distribution that enables accurate detection without requiring excessive magnet length, thus achieving multi-functionality within a compact form factor.
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
Enhances drive performance and position detection accuracy, enabling more precise and efficient image blur correction in imaging devices while reducing the overall size of the actuator and imaging device.
Implementation Method 1
a magnet configured to move a predetermined distance relative to the coil via a magnetic force generated when current is passed through the coil
Implementation Method 2
a magnetism detection element configured to detect the position of the magnet
Data Source
AI summary
The actuator disclosed herein comprises a coil, a magnet and a magnetism detection element. The magnet is configured to move a predetermined distance relative to the coil via a magnetic force generated when current is passed through the coil. The magnet includes a first polarization line perpendicular to the direction in which the magnet moves relative to the coil, and a second polarization line parallel to the first polarization line. The magnetism detection element is configured to detect the position of the magnet. The coil faces the first polarization line and the magnetism detection element faces the second polarization line. The length from the second polarization line to a first end of the magnet is equal to or more than 1.25 times the predetermined distance. The first end of the magnet is closer to the magnetism detection element than to the coil.