Optical Component Drive Layout for Large-Stroke Blur Correction
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Solution Overview
Problem
Existing drive devices for image blur correction in image capturing apparatuses face challenges in achieving a large stroke movement while maintaining required thrust, often resulting in increased size and complexity, and existing position detection methods are not suitable for large driving amounts, leading to inefficiencies and higher manufacturing costs.
Innovation Solution
A compact drive device design featuring a coil interposed between two magnet sections with non-overlapping polarization lines, allowing for a larger stroke and thrust, and utilizing position detection elements closer to the upper magnet group to enhance detection range and accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If magnets are arranged to increase the driving amount (stroke), then the stroke is increased, but the device size increases
Solution Approach 1:
The patent applies dimensionality change by arranging magnets in the optical axis direction (depth dimension) rather than only in the lateral direction. By placing first and second magnet sections at different positions along the optical axis with a predetermined spacing, the patent creates a three-dimensional magnet arrangement that increases the effective stroke without proportionally increasing the lateral device footprint, thus resolving the contradiction between stroke and device size.
Solution Approach 2:
The patent segments the magnet system into first and second magnet sections positioned at different locations along the optical axis. This segmentation allows each magnet section to contribute to the magnetic flux in a complementary manner, enabling increased stroke through coordinated magnetic interaction while maintaining a compact overall structure that would not be possible with a single large magnet arrangement.
2Force
If magnets are arranged to ensure thrust at large relative movement positions, then the thrust is ensured, but the device size increases
Solution Approach 1:
The patent utilizes the optical axis direction (depth dimension) to position multiple magnet sections, creating a layered magnetic field structure. This three-dimensional arrangement ensures that magnetic flux density remains sufficient at large relative movement positions without requiring lateral expansion of the device, thereby maintaining thrust while controlling device size.
Solution Approach 2:
The patent applies local quality by positioning magnet sections at specific locations along the optical axis where they can optimally contribute to magnetic flux generation. The first and second magnet sections are placed at predetermined spacings to create localized high-density magnetic fields precisely where needed during large relative movements, ensuring thrust without uniform expansion of the entire device.
3Device complexity
If a single magnet is used for both driving and position detection, then the device complexity is reduced, but the position detection accuracy decreases
Solution Approach 1:
The patent applies multi-functionality by using the same magnet sections (first and second magnet sections) for both driving the movable section and enabling position detection. The magnet sections generate magnetic fields that serve dual purposes: producing electromagnetic force for actuation and providing magnetic flux density variations for position sensing, thereby reducing device complexity while maintaining adequate position detection functionality.
Solution Approach 2:
The patent ensures that different regions of the magnet sections serve different functions - certain areas optimize for driving while other areas optimize for position detection. The predetermined spacing and positioning of magnet sections create localized magnetic field characteristics that simultaneously satisfy both driving and detection requirements, balancing functionality without requiring separate dedicated components.
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
The solution enables a compact drive device capable of moving optical components with a large stroke while ensuring sufficient thrust, reducing device size and manufacturing costs, and improving position detection accuracy even during large movements.
Implementation Method 1
the movable section is moved relative to the fixed section by using an interaction between a magnetic field generated by causing electric current to flow through the coil and a magnetic field of the magnet
Implementation Method 2
a magnetic sensor that outputs an electrical signal according to a change in magnetic flux density, such as a Hall element or an MR (magnetic resistance) element, is used
Data Source
AI summary
A drive device compact in size and capable of moving an optical component with a large stroke while ensuring a required thrust. A movable section holds the optical component. A coil is disposed in one of a fixed section and the movable section, and first and second magnet sections are arranged in the other of them with a predetermined spacing in an optical axis direction of the optical component with the coil interposed therebetween. The drive device moves the movable section in a first direction orthogonal to the optical axis direction. When viewed from the optical axis direction, a distance in the first direction from the optical axis of the optical component to the polarization line of the first magnet section is different from a distance in the first direction from the optical axis to the polarization line of the second magnet section.