Camera Module Drive Layout for AF and OIS Magnetic Separation
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Solution Overview
Problem
The increasing demand for high-quality mobile phone camera modules with optical image stabilization and auto-focus functions is hindered by the limitations of motor volume, weight, and magnetic interference, leading to reduced focusing and anti-vibration capabilities due to larger lenses and complex motor mechanisms.
Innovation Solution
A driving device with separate auto-focus and optical image stabilization assemblies, featuring focusing and vibration compensation magnets and coils, allows for larger anti-vibration travel and reduces magnetic interference, using rollers to maintain distance and reduce friction, enabling movement and rotation to compensate for image blurring.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the lens volume and weight are increased to improve imaging quality, then the driving force requirement increases, but the motor volume is limited by the camera module size
Solution Approach 1:
The patent divides the motor into two independent magnetic systems: a focusing magnetic system with focusing magnets and coils for auto-focus, and a vibration compensation magnetic system with vibration compensation magnets and coils for optical image stabilization. This segmentation allows each system to operate independently with optimized magnetic field strength, enabling sufficient driving force for heavier lenses without increasing overall motor volume
Solution Approach 2:
The patent positions the focusing magnets on the outer sidewall of the focusing base and the vibration compensation magnets on the bottom of the fixed base, creating spatial separation in different dimensions. This dimensional arrangement allows both magnetic systems to coexist within the limited camera module volume while providing sufficient driving force for high-quality imaging
2Manufacturing precision
If the lens weight is increased to improve imaging quality, then the focusing and anti-vibration travel decreases due to limited driving force
Solution Approach 1:
The patent segments the motor into independent focusing and vibration compensation systems, allowing each system to provide dedicated driving force. The vibration compensation system specifically addresses anti-vibration travel requirements, enabling heavier lenses to achieve sufficient compensation distance without compromising imaging quality
Solution Approach 2:
The patent changes the magnetic field parameters by using separate focusing and vibration compensation magnetic systems with independently adjustable coil currents. This allows optimization of the magnetic field strength and direction to achieve sufficient anti-vibration travel distance even with heavier lenses
3Manufacturing precision
If the lens weight is increased to improve imaging quality, then the movement speed decreases and the time to reach compensation position increases
Solution Approach 1:
The patent divides the driving system into separate focusing and vibration compensation magnetic systems. The vibration compensation system can independently generate strong magnetic forces to accelerate the lens assembly, maintaining high movement speed even with increased lens weight, thus reducing the time to reach compensation position
Solution Approach 2:
The vibration compensation magnetic system can generate strong instantaneous magnetic forces to rapidly accelerate the lens assembly to the required compensation position, effectively 'rushing through' the movement process to minimize response time despite heavier lens mass
4Volume of moving object
If magnets and coils are arranged closely to reduce motor volume, then magnetic field interference increases causing magnet displacement and vibration
Solution Approach 1:
The patent segments the magnetic system into separate focusing and vibration compensation subsystems with distinct magnet and coil arrangements. The focusing magnets are positioned on the outer sidewall while vibration compensation magnets are positioned on the bottom, creating sufficient spatial separation to avoid magnetic field interference between the two systems, ensuring magnetic field stability and preventing magnet displacement
Solution Approach 2:
The patent uses the focusing base and fixed base as intermediary structures to spatially separate the two magnetic systems. The focusing base with its outer sidewall positioning and the fixed base with bottom positioning act as mediators that maintain appropriate distance between the magnetic components, preventing direct magnetic interference while preserving compact overall dimensions
5Force
If the motor mechanism is made more complex to provide sufficient driving force, then the device thickness increases
Solution Approach 1:
The patent segments the motor into two independent magnetic systems that share common structural components (focusing base, fixed base, roller). This segmentation allows sufficient driving force to be achieved through magnetic field interactions rather than complex mechanical transmissions, reducing the overall device thickness while maintaining the required driving capability for both focusing and vibration compensation
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 enhances imaging quality by improving focusing and anti-vibration capabilities, simplifying the motor structure, and reducing the overall size and weight of the camera module.
Implementation Method 1
Magnets and coils are arranged in the motor to generate the necessary magnetic field to drive the lens to move
Implementation Method 2
the focusing coil is supported by the fixed base and corresponds to the focusing magnet so as to drive the lens to move along an optical axis direction of the lens by the focusing base in a case where the focusing coil is energized
Implementation Method 3
the vibration compensation coil is disposed on the vibration compensation base and corresponding to the vibration compensation magnet for driving the imaging assembly to move by the vibration compensation base in a case where the vibration compensation coil is energized
Implementation Method 4
the vibration compensation actuator includes at least one vibration compensation coil and at least one vibration compensation magnet supported on the bottom of the fixed base
Implementation Method 5
the anti-vibration of the driving device is designed in a single-layer roller manner, the roller is employed to maintain the distance between the movable portion and the fixed portion, and the friction force between the movable portion and the fixed portion is reduced
Data Source
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AI summary
The present disclosure provides a driving device and a camera module, wherein the driving device includes an auto-focus assembly and an optical image stabilizing assembly, the auto-focus assembly includes a focusing base, a focusing actuator and a fixed base, the focusing actuator includes at least one focusing coil and at least one focusing magnet disposed on an outer sidewall of the focusing base, the focusing coil is supported by the fixed base and corresponds to the focusing magnet so as to drive the lens to move along an optical axis direction of the lens by the focusing base in a case where the focusing coil is energized; and the optical image stabilizing assembly is supported by the fixed base and is transmissibly connected to the imaging assembly, so that the optical image stabilizing assembly drives the imaging assembly for vibration compensation.