Camera Actuator Magnet Layout for Slim OIS Tilt Guidance
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Solution Overview
Problem
Ultra-slim and ultra-small camera modules face challenges in providing effective optical image stabilization due to space constraints and magnetic field interference, which affects the performance of optical image stabilizers and increases current consumption.
Innovation Solution
A camera actuator design that includes a housing with a mover and a tilting guide unit, where a first magnet and a second magnet are positioned to reduce the force applied to the tilting guide unit and overlap its protruding portions, minimizing magnetic interference and frictional force, allowing for efficient optical image stabilization in high-resolution cameras.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the lens size is increased to increase the amount of received light in high-resolution cameras, then the light reception capability is improved, but the space occupied by the actuator for OIS increases, making it difficult to ensure sufficient space for tilting or moving the lens
Solution Approach 1:
The patent repositions the OIS magnet from a lateral arrangement to an arrangement along the optical axis direction. The magnet is positioned to overlap with the protruding portion of the tilting guide unit in the optical axis direction, utilizing the Z-axis dimension rather than consuming lateral space. This dimensional shift allows the lens to be larger while maintaining sufficient lateral space for actuator operation.
2Reliability
If the actuator for OIS is disposed around the lens, then the OIS function is achieved, but magnetic field interference occurs between the OIS magnet and AF or zoom magnets when all functions are included in the camera module
Solution Approach 1:
The patent introduces a tilting guide unit with a protruding portion as an intermediary element between the OIS magnet and the lens. The magnet is positioned to overlap with this protruding portion in the optical axis direction, creating a spatial buffer that reduces magnetic field interference with other magnets while maintaining the OIS function through the guide unit's mechanical action.
3Reliability
If the protruding portion of the tilting guide unit is affected by magnetic force generated by magnets, then the frictional force increases, but this increases current consumption and decreases the OIS suppression ratio
Solution Approach 1:
The patent strategically positions the magnet to overlap with the protruding portion in the optical axis direction, converting the potential harmful magnetic attraction into a beneficial pre-compression force. This positioning reduces the lateral frictional force during tilting motion by ensuring smooth contact, thereby decreasing current consumption while maintaining or improving the OIS suppression ratio through more efficient magnetic actuation.
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 optical image stabilization with reduced current consumption and increased suppression ratio for optical image stabilizers, making it suitable for ultra-slim and ultra-small, high-resolution camera modules.
Implementation Method 1
a first magnet and a second magnet smaller than the first magnet, which press the tilting guide unit against the mover
Data Source
AI summary
An embodiment of the present invention discloses a camera actuator comprising: a housing; a mover disposed in the housing and having an optical member disposed therein; a tilting guide portion for guiding tilting of the mover; and a first magnetic body which presses the tilting guide portion against the mover and a second magnetic body which is smaller than the first magnetic body, wherein the tilting guide portion comprises: a base; first protrusions protruding from one surface of the base toward the mover; and second protrusions protruding from the other surface of the base in the opposite direction to the first protrusions, wherein any one of the first protrusions and the second protrusions are spaced apart from each other in a horizontal direction and have a plurality of contact points with any one of the mover and the housing, and the first magnetic body is located within contact points facing each other among the plurality of contact points.