Optical Image Stabilization Driver with Segmented Magnetic Circuit
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Solution Overview
Problem
Conventional optical image stabilization apparatuses face challenges in reducing size and power consumption due to inefficient force distribution and increased size requirements when dealing with camera tilting and vertical orientation, leading to larger electromagnetic actuators and increased thrust needs.
Innovation Solution
The apparatus incorporates a shift member and elastic members to support the image stabilization element, with a driver system featuring first and second magnet parts and coils, and magnetized portions strategically placed to generate balanced forces without increasing the actuator size, allowing for compact design and reduced power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If a ferromagnetic body is installed above the center of the coil to apply magnetic force and support its own weight, then the size of the electromagnetic actuator is reduced, but the force required cannot be reduced during imaging with vertically oriented camera
Solution Approach 1:
The magnetic circuit is segmented into multiple yokes (first yoke, second yoke, third yoke, fourth yoke) arranged around the coil, each contributing to the magnetic force in different directions. This segmentation allows the magnetic force to be distributed more effectively to counteract gravity in various camera orientations, solving the problem where a single ferromagnetic body cannot provide sufficient force reduction during vertical imaging.
Solution Approach 2:
Different yokes are positioned at specific locations around the coil (first and second yokes on one side, third and fourth yokes on the other side) to create localized magnetic force components. This local quality arrangement ensures that the magnetic force acts effectively in all orientations, particularly during vertical imaging where the ferromagnetic body alone would be insufficient.
2Force
If the yoke is attached to the shift frame when the coil is attached to the shift frame, then the electromagnetic actuator becomes larger, but the lens barrel size increases
Solution Approach 1:
The yoke is merged with the base member to form an integrated structure, eliminating the need for separate attachment of the yoke to the shift frame. This merging reduces the overall size of the electromagnetic actuator while maintaining the necessary holding force, as the yoke's magnetic circuit function is achieved through its integrated design with the base member rather than through additional components on the shift frame.
3Device complexity
If an elastic member is used to mechanically hold the shift frame, then the structure is simplified, but the required thrust becomes larger as the image stabilization element moves away from the center
Solution Approach 1:
The mechanical elastic member holding structure is supplemented and partially replaced by a magnetic holding force generated by the electromagnetic actuator. The magnetic force provides a holding component that does not increase with displacement distance, thereby reducing the required thrust from the electromagnetic actuator as the image stabilization element moves away from the center, while maintaining the simplified mechanical structure.
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 enables a compact optical image stabilization apparatus with reduced power consumption and effective image stabilization performance without increasing the size of the drive magnet, coil, or yoke, maintaining image stabilization performance while minimizing weight and power usage.
Implementation Method 1
a driver configured to move the shift member. The driver includes a first magnet part and a second magnet part provided on one of the base member and the shift member, a coil provided on the other of the base member and the shift member
Implementation Method 2
an elastic member configured to support the image stabilization element and the shift member
Implementation Method 3
The driver includes a first magnet part and a second magnet part provided on one of the base member and the shift member, a coil provided on the other of the base member and the shift member, a first magnetized portion provided on a side of the first magnet part with respect to a center axis of an opening in the coil
Data Source
AI summary
An optical image stabilization apparatus includes an image stabilization element, a base member, a shift member configured to hold the image stabilization element and movable in a direction including a component orthogonal to an optical axis relative to the base member, an elastic member configured to support the image stabilization element and the shift member, and a driver configured to move the shift member. The driver includes a first magnet part and a second magnet part provided on one of the base member and the shift member, a coil provided on the other of the base member and the shift member, a first magnetized portion provided on a side of the first magnet part with respect to a center axis of an opening in the coil, and a second magnetized portion provided on a side of the second magnet part with respect to the center axis.