Optical Drive Device Non-Uniform Yoke Thickness
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Solution Overview
Problem
Existing drive devices for optical systems face challenges in efficiently generating thrust while minimizing size and weight, especially when the movement amount in the optical axis direction is large and the weight of the movable portion is significant.
Innovation Solution
A drive device comprising a first member, a first coil, and a second coil, where the first member drives the coils using electromagnetic forces, and the thickness of a second yoke is greater than that of a first yoke, allowing for efficient thrust generation and reduced size and weight.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If a conventional drive device with uniform yoke thickness is used, then the structure is simple and easy to manufacture, but the thrust generation efficiency is insufficient for large movement amounts and heavy movable portions
Solution Approach 1:
The yoke is designed with non-uniform thickness where the first yoke portion has a first thickness and the second yoke portion has a second thickness different from the first. This local variation in thickness optimizes the magnetic flux distribution in different regions, enhancing thrust generation efficiency specifically in areas where it is most needed while maintaining overall structural feasibility.
Solution Approach 2:
The yoke is divided into multiple segments (first yoke portion and second yoke portion) with different thicknesses. This segmentation allows each portion to be optimized independently for its specific functional requirements, enabling better thrust generation without requiring a complete redesign of the entire yoke structure.
2Force
If the yoke thickness is increased to improve thrust generation, then the thrust efficiency improves, but the overall device size and weight increase
Solution Approach 1:
Instead of uniformly increasing the yoke thickness throughout, the invention applies increased thickness only to specific portions (first yoke portion and second yoke portion) where it most effectively enhances thrust generation. This localized approach improves force output while minimizing the additional weight compared to a uniform thickness increase.
Solution Approach 2:
The invention changes the thickness parameter of the yoke in a non-uniform manner, creating a gradient or stepped thickness profile. This parameter variation optimizes the magnetic circuit efficiency for thrust generation while controlling the overall material usage and device weight.
3Force
If a single yoke structure is used, then the device is compact and simple, but the thrust efficiency for multiple optical systems is insufficient
Solution Approach 1:
The yoke is segmented into a first yoke portion and a second yoke portion, each with different thicknesses optimized for driving specific optical systems. This segmentation enables independent optimization of thrust efficiency for each optical system while maintaining a relatively integrated structure that doesn't excessively increase device complexity.
Solution Approach 2:
The multi-thickness yoke structure serves multiple functions: it drives the first optical system through the first yoke portion, drives the second optical system through the second yoke portion, and optimizes magnetic flux distribution across the entire assembly. This multi-functionality achieves high thrust efficiency for multiple optical systems without requiring separate drive mechanisms for each.
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 efficient thrust generation for large movement amounts and heavy movable portions, while reducing the overall size and weight of the drive device, thereby improving the performance and efficiency of the optical system.
Implementation Method 1
the first member drives the first coil by an electromagnetic force generated in the first coil and drives the second coil by an electromagnetic force generated in the second coil
Data Source
AI summary
A drive device includes a magnetic circuit unit including a first magnet, a second magnet, a first yoke that holds the first magnet and the second magnet, and a second yoke disposed between the first magnet and the second magnet, a first coil that is bonded to a first zoom lens and corresponds to the first magnet, and a second coil that is bonded to a second zoom lens and corresponds to the second magnet, in which the magnetic circuit unit drives the first coil and the second coil, and a thickness of the second yoke is larger than a thickness of the first yoke.