Camera Module Drive Layout for AF and OIS Magnetic Isolation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The increasing demand for high-quality imaging in mobile phone cameras is hindered by the limitations of motor volume and weight, leading to reduced focusing and anti-vibration capabilities due to larger and heavier lenses, which complicate the motor mechanism and increase internal magnetic interference.
Innovation Solution
A driving device with separate auto-focus and optical image stabilization assemblies, featuring focusing and vibration compensation magnets to drive lenses along and perpendicular to the optical axis, respectively, while minimizing magnetic interference and simplifying the motor structure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the lens volume and weight are increased to improve imaging quality, then the driving force requirement increases, but the motor volume and weight are limited, leading to reduced focusing and anti-vibration capabilities
Solution Approach 1:
The patent divides the motor system into two independent assemblies: a focusing assembly with focusing coil and focusing magnet for axial movement, and a vibration compensation assembly with vibration compensation coil and vibration compensation magnet for radial movement. This segmentation allows each assembly to be optimized independently for its specific function while working together to drive the lens, resolving the contradiction between required driving force and limited motor volume.
Solution Approach 2:
The patent introduces a radial vibration compensation dimension in addition to the axial focusing dimension. The vibration compensation assembly operates in a direction perpendicular to the optical axis, adding a new degree of freedom to the lens drive system. This dimensional expansion allows the system to address both focusing and anti-vibration requirements without increasing the overall motor footprint.
2Strength
If the lens weight is increased to improve imaging quality, then the motor driving capability is insufficient, resulting in shorter travel distance and slower movement speed
Solution Approach 1:
By segmenting the drive system into focusing and vibration compensation assemblies, the patent distributes the driving tasks. The focusing assembly handles axial movement while the vibration compensation assembly handles radial movements. This division reduces the burden on each individual assembly, enabling faster response times and higher movement speeds despite the increased lens weight.
Solution Approach 2:
The patent implements dynamic control where the vibration compensation assembly can rapidly adjust the lens position in the radial direction to counteract vibrations. This dynamic response capability allows the system to maintain high speed and accuracy in lens movement, overcoming the limitations imposed by increased lens weight.
3Strength
If the motor mechanism is complicated to provide sufficient driving force, then the number of components increases and device thickness increases, but the available space is limited
Solution Approach 1:
The patent segments the motor mechanism into two distinct but coordinated assemblies, each with a simple structure consisting of a coil and a magnet. This segmentation avoids the need for a single complex motor mechanism while still providing sufficient driving force through the combined action of both assemblies. The simplicity of each individual assembly keeps the overall device thickness within acceptable limits.
4Volume of moving object
If magnets are arranged close together (less than 7 mm) to reduce motor size, then magnetic field interference occurs, causing magnet displacement and affecting focusing and imaging quality
Solution Approach 1:
The patent segments the magnetic components into two separate assemblies: the focusing assembly with focusing magnet and the vibration compensation assembly with vibration compensation magnet. By spatially separating these magnetic components, the patent reduces magnetic field interference between them. This segmentation allows the magnets to be positioned at optimal distances for their respective functions while minimizing harmful magnetic interactions.
Solution Approach 2:
The patent introduces a non-magnetic intermediary structure (the lens barrel and housing) that separates and positions the two magnetic assemblies. This intermediary structure maintains appropriate spacing between the focusing magnet and vibration compensation magnet, preventing direct magnetic interference while still allowing the system to maintain a compact overall size.
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
Improves imaging quality by enhancing focusing and anti-vibration capabilities with larger travel ranges and reduced complexity, maintaining compact size and reducing magnetic interference.
Implementation Method 1
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 2
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
Data Source
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.