Camera Module Wiring Structure for Low-Force Sensor Shift OIS
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Solution Overview
Problem
Existing camera modules face issues with increased spring stiffness and force requirements for image sensor shift or tilting due to larger image sensors, complex structures, magnetic field interference, and reliability concerns under external impacts, particularly in OIS implementation, which affect image quality and safety in applications like ADAS.
Innovation Solution
A lens driving device with a unique housing and wiring structure that includes a bobbin, coil, and magnet arrangement, along with a sensor substrate and wiring frames, to minimize spring stiffness, prevent magnetic interference, and enhance reliability, allowing for efficient OIS and AF operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the image sensor size is increased to improve image quality, then the image quality is improved, but the spring stiffness increases and more force is required for image sensor shift or tilting
Solution Approach 1:
The patent replaces the mechanical spring-based support system with a magnetic field-based support system. Magnets are positioned to provide upward magnetic force to support the image sensor weight, eliminating or reducing the need for mechanical springs. This allows for reduced spring stiffness while maintaining support capability, thereby reducing the force required for image sensor shift or tilting operations while preserving image quality.
Solution Approach 2:
The patent changes the physical parameters of the support system by introducing magnetic fields as a supporting force mechanism. By adjusting magnetic field strength and distribution through strategically positioned magnets, the system can support larger image sensors without proportionally increasing spring stiffness, thus maintaining ease of movement while supporting higher quality sensors.
2Reliability
If magnets and coils are added for OIS function, then OIS capability is improved, but magnetic field interference occurs between components
Solution Approach 1:
The patent applies local quality by creating distinct magnetic field zones with different characteristics. Support magnets are positioned to generate magnetic fields primarily in vertical regions, while OIS magnets and coils are positioned to generate magnetic fields primarily in horizontal regions. This spatial differentiation of magnetic field characteristics minimizes interference between the support function and OIS function while maintaining both capabilities.
Solution Approach 2:
The patent positions magnets and coils to create regions of relatively uniform magnetic potential in different spatial zones. By carefully positioning the support magnets and OIS magnets/coils, the system creates equipotential regions that prevent unwanted magnetic field interactions, allowing both OIS and support functions to operate independently without significant interference.
3Reliability
If a mechanical driving device is used for lens movement, then OIS function is achieved, but the structure becomes complex and miniaturization is limited
Solution Approach 1:
The patent makes the magnetic field system multi-functional by using magnets and coils that simultaneously perform both support functions (holding the image sensor in position) and OIS functions (correcting image shake). This eliminates the need for separate mechanical driving devices, reducing structural complexity while maintaining OIS capability and enabling miniaturization.
Solution Approach 2:
The patent merges the support mechanism and OIS mechanism into a single integrated magnetic field-based system. By combining these functions into one system rather than using separate mechanical devices, the overall structure becomes simpler and more suitable for miniaturization while maintaining full OIS functionality.
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 reduces the force required for image sensor shift and tilting, prevents component separation, and maintains image quality by minimizing distortion and magnetic interference, enhancing the reliability and safety of camera modules, especially in vehicles.
Implementation Method 1
a coil disposed on the second housing; the first housing is capable of rotational driving and tilting driving with respect to an optical axis
Implementation Method 2
a magnet is disposed on the protruding part; the first housing is capable of rotational driving and tilting driving with respect to an optical axis
Data Source
AI summary
The embodiment relates to a lens driving device and a camera module including the same. A lens driving device according to an embodiment can include a first housing in which a bobbin including a lens is disposed and a magnet is disposed; a second housing disposed to surround the first housing and having a coil disposed thereon; a main substrate disposed below the second housing, a sensor substrate located between the main substrate and the second housing and having an image sensor disposed thereon, and a wiring substrate electrically connecting the main substrate and the sensor substrate.