Integrated VCM Camera Module With Tilt Coil Image Stabilization
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Solution Overview
Problem
Conventional camera modules in mobile devices lack auto focus functionality and handshake correction, leading to inefficiencies in adjusting the lens-image sensor gap and stabilizing images during use.
Innovation Solution
A compact Voice Coil Motor (VCM) design incorporating a rotor with a bobbin and driving coil, a stator with a driving magnet, and a tilting unit with a tilt magnet and coil, which enables auto focusing and handshake correction while minimizing volume, height, and area, and enhancing tilting performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a conventional camera module is used, then the device structure is simple, but it lacks auto focus function and handshake correction capability
Solution Approach 1:
The patent combines the auto focus mechanism and handshake correction mechanism into a single integrated VCM module. The rotor assembly includes both the driving coil for auto focus and the tilt coil for handshake correction, allowing both functions to be performed by one unified structure rather than separate components.
Solution Approach 2:
The VCM module serves multiple functions: it enables auto focus by adjusting the lens-image sensor gap, provides handshake correction through rotor tilting, and maintains a compact design. The single module performs what would traditionally require separate mechanisms.
2Adaptability or versatility
If auto focus and handshake correction functions are added, then functionality is improved, but device volume and height increase
Solution Approach 1:
The patent employs a nested arrangement where the flexible circuit board is inserted into the image sensor, and the rotor is positioned within the housing that contains the stator. This nesting allows components to occupy overlapping or nested spaces, reducing the overall volume required for the module.
Solution Approach 2:
The patent utilizes three-dimensional spatial arrangement to pack components efficiently. The flexible circuit board is routed through the housing and inserted into the image sensor from the rear, utilizing the depth dimension rather than requiring additional lateral space. The rotor tilts within the confined space defined by the housing and stator.
3Area of stationary object
If a flexible circuit board is used for tilting the image sensor, then the area is reduced, but the signal lines become congested
Solution Approach 1:
The flexible circuit board is divided into multiple segments or layers, with signal lines for the driving coil and tilt coil arranged in separate regions. The signal lines are dispersively arranged to prevent congestion, with specific routing paths defined to avoid interference between the auto focus and handshake correction signals.
4Adaptability or versatility
If the rotor tilting performance is enhanced, then handshake correction capability is improved, but the device height increases
Solution Approach 1:
The patent optimizes the magnetic field strength and coil parameters to achieve effective rotor tilting within a limited height range. By adjusting the magnetic properties and electrical parameters of the tilt coil and tilt magnet, the system achieves sufficient tilting performance without requiring increased physical dimensions.
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 VCM effectively integrates auto focus and handshake correction functions without increasing the device's volume or height, ensuring improved image stabilization and focus adjustment without compromising the compact design.
Implementation Method 1
a rotor (100) including a bobbin (110) arranged at an upper surface of a base (610), and a driving coil (120) wound on the bobbin (110)... a stator (200) including a driving magnet (220) opposite to the driving coil (120)
Implementation Method 2
a tilting unit (300) including a tilt magnet (310) arranged at an outer surface of a lateral plate (214)... and a tilt coil unit (330) opposite to the tilt magnet (310)
Data Source
AI summary
A VCM is disclosed, the VCM including a rotor including a bobbin arranged at an upper surface of a base formed with an opening, and a driving coil wound on the bobbin, a stator including a driving magnet opposite to the driving coil, and a yoke secured by the driving magnet at an inner surface of a lateral plate, and a tilting unit including a tilt magnet arranged at an outer surface of the lateral plate, a housing fixing the tilt magnet, and a tilt coil unit opposite to the tilt magnet.