Magnetic Driver Yoke Segmentation for Stable Rotor Positioning
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Solution Overview
Problem
Conventional magnetic drivers for shutter devices and optical filter drivers face challenges in downsizing the rotor magnet while maintaining driving accuracy and stability, with complex yoke shapes leading to unstable positioning and increased component count.
Innovation Solution
A magnetic driver design featuring a rotor magnet, a coil bobbin with a through hole, a straight and arcuate yoke, a support member, and a thrust receiving member that regulates the rotor magnet's position, allowing for simplified assembly and stable positioning of the yoke, reducing the complexity of the yoke shape and component count.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a hook-shaped yoke is used to fix bearings, then the yoke can hold multiple components, but the yoke shape becomes complicated and positioning becomes unstable
Solution Approach 1:
The yoke is divided into two separate portions: a hook-shaped first portion for fixing bearings and a plate-shaped second portion for positioning. This segmentation allows each portion to have a simple, dedicated shape optimized for its specific function, avoiding the complexity and positioning instability of a single integrated hook-shaped yoke.
Solution Approach 2:
The plate-shaped second portion of the yoke acts as an intermediary element that provides a stable positioning surface between the coil bobbin and the arcuate magnetic pole portion. This intermediary structure enables accurate positioning without requiring the entire yoke to have a complex integrated shape.
2Ease of manufacture
If positioning is performed on only one surface of the main body case, then assembly is simplified, but positioning accuracy of the rotor magnet and yoke deteriorates
Solution Approach 1:
Positioning is achieved by extending from a single-surface approach to a multi-surface approach. The plate-shaped second portion of the yoke provides positioning on multiple surfaces (top surface and side surface), adding dimensional constraints that improve positioning accuracy while maintaining assembly simplicity through the modular yoke structure.
3Volume of moving object
If the rotor magnet outer shape is downsized, then the overall device size is reduced, but the driving accuracy and stability may deteriorate
Solution Approach 1:
The invention replaces complex mechanical positioning structures with a magnetic field-based positioning system. The plate-shaped second portion of the yoke, when magnetized, creates a magnetic field that accurately positions the rotor magnet through magnetic interaction, enabling downsizing of the rotor magnet while maintaining driving accuracy and stability.
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 design achieves a compact, accurate, and reliable magnetic driver that maintains driving torque without increasing the number of components, enabling precise control of shutter blades and aperture operations in image sensing apparatuses.
Implementation Method 1
a coil placed outside one end of the main body case in the axis direction, and formed by winding a wire around a bobbin
Implementation Method 2
a rotor made of a permanent magnet
Implementation Method 3
a yoke made of a magnetic material having two ends bent to form an almost U-shaped section
Data Source
AI summary
A magnetic driver includes a rotor magnet, a coil bobbin around which a coil is wound, and which has a through hole in a central portion, a yoke including a straight portion to be inserted into the through hole, and an arcuate portion connected to a distal end of the straight portion, a support member which rotatably supports the rotor magnet, and a thrust receiving member which includes an engaging portion to be engaged with the support member, has one surface which regulates one end of the rotor magnet in a thrust direction, and the other surface on which the coil bobbin is placed, and is held between the coil bobbin and the arcuate portion of the yoke. The yoke is assembled as an integrated yoke by inserting the straight portion into the through hole, and fixing the straight portion to the arcuate portion as another member.