Camera Module Drive Assembly for Focus and Optical Stabilization
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Solution Overview
Problem
The increasing demand for high imaging quality 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 lenses, complex motor mechanisms, and magnetic interference within motors.
Innovation Solution
A driving device with separate auto-focus and optical image stabilization assemblies, utilizing focusing and vibration compensation magnets and coils to drive lenses along and perpendicular to the optical axis, with anti-vibration rollers to maintain distance and reduce friction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the lens volume and weight are increased to improve imaging quality, then the imaging quality is improved, but the motor driving force becomes insufficient and the device volume increases
Solution Approach 1:
The patent divides the motor system into two independent motors: a first motor dedicated to driving lens focusing movement, and a second motor dedicated to driving vibration compensation. This segmentation allows each motor to be optimized for its specific function, reducing the overall complexity and volume compared to a single motor system that would need to handle both functions.
Solution Approach 2:
The patent makes the lens movable in multiple directions by combining two motors: one for focusing (axial movement) and one for vibration compensation (perpendicular movement). This multi-functional arrangement allows a single lens assembly to achieve both auto-focus and optical image stabilization without requiring separate mechanisms.
2Manufacturing precision
If the lens weight is increased to improve imaging quality, then the imaging quality is improved, but the motor response speed decreases and focusing ability is affected
Solution Approach 1:
By separating the driving functions into two independent motors, each motor can be sized and optimized for its specific task. The first motor handles focusing while the second motor handles vibration compensation, allowing faster and more precise response for each function without being burdened by the other.
Solution Approach 2:
The patent replaces a single complex mechanical motor system with two simpler motor systems working in coordination. This substitution reduces mechanical complexity and improves response speed by eliminating the need for one motor to simultaneously manage multiple conflicting functions.
3Force
If the motor mechanism is made more complex to drive heavier lenses, then the driving capability is improved, but the device thickness increases and structure becomes complicated
Solution Approach 1:
The patent segments the motor mechanism into two independent units, each with its own drive coil and magnet assembly. This segmentation simplifies the overall mechanism by allowing each motor to be independently optimized and positioned, reducing the complexity of transmission mechanisms that would be required in a single motor system.
Solution Approach 2:
The patent merges the functions of focusing and vibration compensation into a single integrated lens assembly that can move in multiple directions. By combining these functions at the lens level rather than requiring separate mechanical systems, the overall device complexity is reduced while maintaining full functionality.
4Volume of moving object
If magnets are arranged closely in the motor to reduce volume, then the motor volume is reduced, but magnetic field interference occurs and imaging quality deteriorates
Solution Approach 1:
The patent segments the magnetic field sources into two separate motor systems with independent coil and magnet arrangements. This spatial segmentation prevents magnetic field interference between the focusing and vibration compensation mechanisms, allowing both to operate at optimal performance without mutual interference, even in a compact configuration.
Solution Approach 2:
The patent optimizes the magnetic field distribution in different local regions: the first motor's magnetic field is optimized for axial focusing, while the second motor's magnetic field is optimized for perpendicular vibration compensation. This localized optimization allows compact arrangement while maintaining imaging quality by ensuring each magnetic field performs its specific function without interfering with the other.
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 focusing and anti-vibration capabilities, allowing for larger anti-vibration travel and simpler motor structures, enhancing imaging quality by compensating for camera module vibrations.
Implementation Method 1
at least one focusing coil and at least one focusing magnet disposed on an outer sidewall of the focusing base, and 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
at least one vibration compensation coil and at least one vibration compensation magnet supported on the bottom of the fixed base, wherein 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.