Camera Actuator Assembly Using Magnetostriction for Compact OIS Focus
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Solution Overview
Problem
Existing camera modules in electronic devices are limited to electromagnetic driving for focusing and anti-shake functions, which can interfere with surrounding magnetic devices and occupy excessive space.
Innovation Solution
A driving component utilizing a magnetostrictive member to control the position of a carrier unit through expansion and contraction, combined with elastic members, to achieve focusing and anti-shake functions without electromagnetic interference, reducing overall size and space occupation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If electromagnetic driving is used to drive the lens, then the camera can achieve focusing and anti-shake functions, but the structural size increases and design options are limited
Solution Approach 1:
The patent combines magnetostrictive driving and electromagnetic driving into a unified driving component. The magnetostrictive member (first coil) and electromagnetic driving member (second coil) are integrated within the same structural framework, allowing both driving modes to coexist in one compact unit. This merging enables multiple driving options without increasing overall structural size, directly resolving the contradiction between design versatility and compactness.
Solution Approach 2:
The driving component is designed to perform multiple functions through different driving modes. The same carrier unit can be driven by either the magnetostrictive member for focusing or the electromagnetic driving member for anti-shake operations. This multi-functionality allows a single component to replace what would traditionally require separate mechanisms, reducing structural size while maintaining design flexibility.
2Ease of operation
If electromagnetic driving components are used, then focusing and anti-shake functions are achieved, but the overall height of the driving component increases
Solution Approach 1:
The patent implements a nested structure where the second carrier (carrying the lens) is positioned inside the first carrier. The electromagnetic driving member and magnetostrictive member are arranged concentrically, with the second coil surrounding the first coil assembly. This nesting allows multiple driving mechanisms to occupy overlapping spatial volumes, significantly reducing the overall height of the driving component while maintaining full functionality.
3Productivity
If traditional electromagnetic driving is used, then the lens can be driven, but more space and weight are required
Solution Approach 1:
The patent substitutes part of the electromagnetic mechanical system with a magnetostrictive system. The magnetostrictive member converts electrical energy directly into mechanical deformation (expansion/contraction) without requiring the same level of mechanical infrastructure as traditional electromagnetic motors. This substitution reduces the weight of moving components while maintaining driving efficiency, as the magnetostrictive effect provides direct actuation with fewer mechanical parts.
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 magnetostrictive driving mode allows for more design flexibility, reduces magnetic interference, and minimizes structural size, enhancing the anti-shake performance and focusing accuracy while optimizing space utilization.
Implementation Method 1
a magnetostrictive member connected with the fixing frame and the carrier unit and configured to control a position of the carrier unit relative to the fixing frame through expansion and contraction of the magnetostrictive member
Implementation Method 2
the magnetostrictive member includes a magnetostrictive body and a first coil wound around the magnetostrictive body, and an expanded or contracted state of the magnetostrictive body is adjusted by controlling a current of the first coil
Implementation Method 3
the driving component further includes a first elastic member, and the first elastic member is connected with the fixing frame and the carrier unit, and the carrier unit is elastically moveable relative to the fixing frame
Data Source
Figure 1
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AI summary
A driving component includes a fixing frame (10), a carrier unit (20) and a magnetostrictive member (30). The carrier unit (20) is configured to carry a component to be driven, and the carrier unit (20) is connected to the fixing frame (10) and configured to move relative to the fixing frame (10). The magnetostrictive member (30) is connected with the fixing frame (10) and the carrier unit (20) and configured to control a position of the carrier unit (20) relative to the fixing frame (10) through expansion and contraction of the magnetostrictive member (30).