Camera Actuator Magnet Merging for Miniaturization
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Solution Overview
Problem
Conventional camera device actuators with hall sensors require additional circuits and separate magnets for driving and detection, limiting miniaturization due to the inclusion of separate components for sensing and driving, which complicates assembly and increases size.
Innovation Solution
A camera device actuator design featuring a magnet on a lens carrier with a member to be detected, a driving coil, and a sensing coil, where the sensing coil includes two coils arranged in-line to accurately sense position changes without separate magnets, and a yoke on the panel to improve driving and sensing performance, allowing for miniaturization and simplified assembly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If separate magnets are used for driving and detection, then sensing accuracy is improved, but device size increases and miniaturization is limited
Solution Approach 1:
The patent combines the driving magnet and detection magnet into a single integrated magnet structure. The magnet is divided into a first magnet portion for driving the voice coil motor and a second magnet portion for detection by the hall sensor, eliminating the need for separate magnets and reducing overall actuator size while maintaining sensing accuracy.
Solution Approach 2:
The single magnet structure serves dual functions: the first magnet portion generates magnetic field for driving the voice coil motor, while the second magnet portion provides magnetic field for position detection by the hall sensor. This multi-functional design eliminates redundant components and enables miniaturization.
2Measurement precision
If hall sensor is included for position sensing, then sensing capability is improved, but device complexity and assembly difficulty increase
Solution Approach 1:
The hall sensor is integrated directly into the magnet structure, with the sensor positioned to detect the magnetic field from the second magnet portion. This integration eliminates separate sensing components and reduces assembly complexity while maintaining position sensing capability.
3Power
If conventional winding coil structure is used, then driving performance is achieved, but manufacturing complexity increases due to pad soldering
Solution Approach 1:
The patent replaces the conventional winding coil structure with a printed circuit board (PCB) integrated coil. The coil is formed by conducting traces on the PCB, eliminating the need for manual wire winding and pad soldering operations, thereby simplifying manufacturing while maintaining driving performance.
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 enhances miniaturization and sensing performance, reduces vulnerability to temperature and disturbance effects, and simplifies the assembly process by eliminating the need for separate magnets and additional circuits, leading to improved camera device actuator efficiency and cost-effectiveness.
Implementation Method 1
a driving coil disposed opposite to and spaced apart from the magnet, on a panel disposed on the housing
Implementation Method 2
a sensing coil including a first sensing coil and a second sensing coil disposed on the panel, spaced apart from and opposite to the member to be detected
Data Source
AI summary
A camera device actuator includes: a magnet disposed on a side surface of a lens carrier disposed to be movable in an optical axis direction in an internal space of a fixed housing; a member to be detected disposed on the side surface of the lens carrier, connected to the magnet, and having a width in the optical axis direction that is less than a width of the magnet in the optical axis direction; a driving coil disposed opposite to and spaced apart from the magnet, on a panel disposed on the housing; and a sensing coil including a first sensing coil and a second sensing coil disposed on the panel, spaced apart from and opposite to the member to be detected, and arranged in-line with each other in the optical axis direction.