Voice Coil Motor Architecture for Autofocus and IBIS Integration
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Solution Overview
Problem
Existing voice coil motors in mobile phones can only provide lens stabilization, failing to achieve both autofocus and in-body image stabilization (IBIS) functions, which are necessary for advanced photographic capabilities.
Innovation Solution
A voice coil motor is designed with both autofocus and IBIS mechanisms, incorporating a coil assembly and magnetic assembly for axial movement and a separate coil module with magnetic assembly for plane movement and rotation, enabling independent operation of autofocus and IBIS functions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a voice coil motor is designed to provide both autofocus and IBIS functions, then the functional versatility is improved, but the device complexity increases
Solution Approach 1:
The patent combines the autofocus mechanism and IBIS mechanism into a single voice coil motor assembly. The autofocus coil assembly and IBIS coil module share a common magnetic assembly and are integrated within the same motor housing, allowing both functions to be achieved through a unified structure rather than separate mechanisms.
Solution Approach 2:
The magnetic assembly serves dual purposes: it interacts with the autofocus coil assembly to enable focus adjustment, and simultaneously interacts with the IBIS coil module to enable image stabilization. This multi-functional design allows a single component to support multiple operational modes.
2Ease of manufacture
If the voice coil motor integrates both autofocus and IBIS mechanisms, then the manufacturing cost is reduced, but the manufacturing precision requirements increase
Solution Approach 1:
The voice coil motor is divided into distinct functional modules: the autofocus coil assembly and the IBIS coil module. Each module can be manufactured and adjusted independently, then assembled together with the shared magnetic assembly. This segmentation allows for specialized manufacturing processes for each function while maintaining overall integration.
3Length of moving object
If the voice coil motor design is optimized for compactness, then the axial size is reduced, but the component weight may increase
Solution Approach 1:
The IBIS coil module is positioned around the autofocus coil assembly in a concentric arrangement, with both coils sharing the same magnetic assembly. This nested configuration allows the IBIS mechanism to utilize the space around the autofocus mechanism, significantly reducing the overall axial height of the motor assembly.
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 image-stabilization performance, reduces component weight and manufacturing costs, and minimizes the motor's axial size, allowing for more compact designs and improved reliability in electronic devices.
Implementation Method 1
When the coil assembly is energized, a first electromagnetic force is generated between the coil assembly and the magnetic assembly to drive the coil assembly to move in an axial direction
Implementation Method 2
When the coil module is energized, a second electromagnetic force is generated between the coil module and the magnetic assembly to drive the second base and the coil module to move relative to the first base
Data Source
AI summary
A voice coil motor includes an autofocus mechanism and an in-body image stabilization (IBIS) mechanism. The autofocus mechanism includes a first base, a cover, a coil assembly disposed between the first base and the cover, and a magnetic assembly arranged on the cover and around the coil assembly. The IBIS mechanism includes a second base disposed at one side of the first base away from the cover and a coil module arranged on the second base. When the coil assembly is energized, a first electromagnetic force is generated between the coil assembly and the magnetic assembly to drive the coil assembly to move in an axial direction, thereby achieving an autofocusing function. When the coil module is energized, a second electromagnetic force is generated between the coil module and the magnetic assembly to drive the second base and the coil module to move relative to the first base.