Camera Actuator Magnet Mounting for Impact-Stable Position Sensing
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Solution Overview
Problem
The existing camera modules with voice coil motors face issues where the magnet part can fall off from the movable-side member due to impacts, leading to structural instability.
Innovation Solution
A camera actuator design that includes a magnet fixing part with a metal attachment surface to securely attach the magnet part to the movable-side member, preventing it from falling off, and a control section to manage the camera module's operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a voice coil motor is used with a magnet part fixed to the movable-side member, then the camera module achieves autofocus and optical image stabilization functions, but the magnet part may fall off from the movable-side member when impact is applied
Solution Approach 1:
The patent applies preliminary action by providing a magnet fixing part with an attachment surface before impact occurs. This fixing part is pre-configured to securely hold the magnet part through attachment means (such as adhesive layers or mechanical fastening structures), ensuring that when impact is applied, the magnet part is already secured and prevented from falling off.
Solution Approach 2:
The magnet fixing part acts as an intermediary element between the movable-side member and the magnet part. This intermediate structure provides a dedicated attachment interface that mediates the connection, allowing the magnet part to be securely fixed to the movable-side member while maintaining the functionality of the voice coil motor system.
2Reliability
If the magnet part is securely attached to prevent falling off, then reliability under impact is improved, but the structure becomes more complex
Solution Approach 1:
The patent merges the magnet fixing part with the movable-side member structure, integrating the attachment functionality into the existing component rather than adding a completely separate fixing mechanism. This integration reduces overall structural complexity while still providing reliable magnet retention through the combined structure.
Solution Approach 2:
The magnet fixing part is designed to serve multiple functions: it provides structural support for the magnet part, ensures secure attachment under impact, and maintains the positional relationship between the magnet part and the coil part. This multi-functionality reduces the need for additional separate components, thereby limiting the increase in device complexity.
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 effectively prevents magnet detachment during impacts, ensuring the camera module's stability and functionality.
Implementation Method 1
The magnet part is used to detect a position of the movable-side member in one of the first direction and the second direction
Implementation Method 2
The magnet part is attached to the attachment surface made of a metal
Implementation Method 3
The magnet part is attached to the attachment surface
Data Source
AI summary
This camera actuator is provided with a stationary-side member, a movable-side member which is provided to the stationary-side member in a displaceable manner and which holds a lens section, and a drive section which displaces the movable-side member in a plane including a first direction and a second direction which is perpendicular to the first direction. The movable-side member has a magnet affixation section for affixing a magnet section thereto such that the magnet section faces the stationary-side member, the magnet section being used for detecting the position of the movable-side member in either the first direction or the second direction. The surface of the magnet affixation section, to which the magnet section is mounted, is formed from metal.