Shake Correction Ball Guide With Magnetic Spring Biasing
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Solution Overview
Problem
Existing shake correction devices in cameras face challenges in efficiently biasing the movable unit to the fixing unit, particularly when using double magnet configurations, which require additional space and are constrained by magnet and coil positions, and coil springs necessitate separate space and complex hook designs.
Innovation Solution
A configuration using a magnetic spring with a non-magnetic member and a magnet member facing a ball with a magnetic member on one side and a non-magnetic member on the other, allowing the ball to roll without attraction to the magnet, thus eliminating the need for additional space and simplifying the design.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If a double magnet configuration is used to bias the movable unit, then the biasing force is improved, but the device complexity and space requirements increase
Solution Approach 1:
The magnetic biasing system is segmented into distinct functional components: a magnet member positioned in the movable unit and a separate non-magnetic member positioned in the fixing unit. This segmentation allows each component to be optimized independently and simplifies the overall structure compared to a double magnet configuration, while still achieving the required biasing force through the interaction between the magnet and the ball.
Solution Approach 2:
A non-magnetic member is introduced as an intermediary component between the magnet and the ball. This intermediary serves as a positioning reference and maintains the magnetic field distribution, enabling the magnet to effectively bias the movable unit without requiring additional magnets. The non-magnetic member acts as a mediator that transmits the magnetic force while preventing direct magnetic interaction that would cause unwanted attraction.
2Force
If coil springs are used to bias the movable unit, then the biasing function is achieved, but additional space and complex hook designs are required
Solution Approach 1:
The mechanical spring biasing system is replaced with a magnetic biasing system. Instead of using coil springs that require significant space and complex hook designs, a magnet member positioned in the movable unit interacts with a non-magnetic member in the fixing unit to provide the necessary biasing force. This substitution eliminates the need for mechanical springs and their associated structural requirements, thereby reducing the overall space requirement.
Solution Approach 2:
The biasing mechanism transitions from a mechanical parameter (spring stiffness, coil diameter) to a magnetic parameter (magnet strength, positioning). By changing the physical principle from mechanical to magnetic, the system achieves the same biasing function with reduced spatial requirements, as magnetic fields can be generated and controlled without the need for bulky mechanical spring components.
3Force
If magnets are positioned close to the ball, then the biasing force is strengthened, but the ball cannot roll freely due to magnetic attraction
Solution Approach 1:
A non-magnetic member is positioned between the magnet and the ball to serve as a mediator. This intermediary maintains the magnetic field necessary for biasing while preventing direct magnetic attraction between the magnet and the ball. The non-magnetic member acts as a barrier that allows the ball to roll freely on the magnetic surface without being pulled toward the magnet, thus resolving the contradiction between strong biasing force and rolling freedom.
Solution Approach 2:
The magnetic field distribution is copied and maintained through the non-magnetic member, which replicates the magnetic environment needed for biasing without creating direct magnetic interaction. The non-magnetic member effectively copies the magnetic field patterns while preventing the harmful effect of direct attraction, allowing the ball to move freely while still experiencing the necessary biasing force.
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 efficient biasing of the movable unit without requiring extra space and simplifies the design, while maintaining effective magnetic force application, suitable for large imaging elements and reducing constraints on size and position.
Implementation Method 1
a first magnet member, a first non-magnetic member, and a first member including a magnetic member are disposed with respect to a first ball that is at least one ball of the plurality of balls, and the first non-magnetic member and the first magnet member are disposed in order, to face the first member with the first ball interposed therebetween
Data Source
AI summary
An aspect of the present invention provides a shake correction device, an imaging apparatus, an optical device, and a driving device. A shake correction device according to an aspect of the present invention is a shake correction device including a fixing unit, a movable unit, and a plurality of balls disposed between the fixing unit and the movable unit, in which the movable unit is movable in contact with the plurality of balls, a first magnet member, a first non-magnetic member, and a first member including a magnetic member are disposed with respect to a first ball that is at least one ball of the plurality of balls, and the first non-magnetic member and the first magnet member are disposed in order, to face the first member with the first ball interposed therebetween.