Dual Lens Module Magnet Layout for Stable AF and OIS
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Solution Overview
Problem
Conventional dual camera modules face issues such as magnet interference, increased design complexity due to multiple terminals, resonance in elastic members, and magnet disengagement during testing, which affect the performance and reliability of dual lens systems.
Innovation Solution
A dual lens driving apparatus is designed with a structure that fixes multiple magnets to a single housing, allowing independent AF and OIS operations for each lens, reduces terminal count, and prevents resonance and magnet disengagement by using a specific coil and elastic member configuration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If two individual camera modules are adjacently disposed, then dual camera functionality is achieved, but magnet interference is generated between the two camera modules
Solution Approach 1:
The patent merges two separate camera modules into a single integrated dual camera module. The housing contains both lens assemblies, image sensors, and processing circuits in one unified structure, eliminating the need for two separate modules and thereby preventing magnet interference between them.
Solution Approach 2:
The patent introduces magnetic shielding materials as intermediaries between magnetic components within the dual camera module. These shielding structures act as mediators that block or redirect magnetic field lines, preventing harmful magnetic interference between different components while maintaining the compact integrated design.
2Adaptability or versatility
If two individual camera modules are used, then dual camera functionality is achieved, but the number of terminals on substrates increases, causing design losses
Solution Approach 1:
The patent combines the terminal structures of two separate camera modules into a single unified terminal interface. The substrate design integrates connection points for both lens assemblies and image sensors, reducing the total number of terminals required compared to using two independent modules.
Solution Approach 2:
The patent designs the substrate with multi-functional terminal regions that can accommodate multiple connection types. A single terminal structure serves multiple purposes by providing electrical connections for both camera lenses and image sensors, thereby reducing the overall terminal count and simplifying the design.
3Ease of operation
If elastic members are used to support bobbin and housing movement, then lens adjustment is enabled, but resonance is generated on the elastic members
Solution Approach 1:
The patent incorporates damping materials and shock-absorbing structures within the housing and bobbin assemblies. These cushioning elements are pre-installed to suppress resonant vibrations of the elastic members during lens adjustment, preventing reliability issues before they occur.
Solution Approach 2:
The patent modifies the physical parameters of the elastic members by selecting materials with optimized viscoelastic properties. The elastic members are designed with specific damping coefficients and stiffness values that allow smooth lens adjustment while naturally suppressing resonance frequencies, thus improving reliability.
4Productivity
If magnets are used in the VCM structure, then lens driving is achieved, but magnet disengagement occurs during reliable test processes
Solution Approach 1:
The patent incorporates retaining structures and mechanical constraints within the VCM assembly that prevent magnet disengagement. These preventive features are built into the housing and bobbin designs to secure magnets in place during testing and operation, ensuring reliability while maintaining lens driving functionality.
Solution Approach 2:
The patent uses composite material structures for the VCM components, combining magnetic materials with mechanically strong bonding materials. The magnets are integrated into the housing and bobbin using composite construction methods that provide both magnetic functionality and mechanical retention, preventing disengagement during testing.
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 effectively prevents magnet interference, reduces terminal count, and enhances reliability by stabilizing the lens system against resonance and disengagement, ensuring smooth operation and improved performance.
Implementation Method 1
a coil disposed on the bobbin; a magnet disposed on the housing to face the coil
Implementation Method 2
a support member movably supporting the housing with respect to the board
Data Source
AI summary
A lens driving apparatus includes a housing; a bobbin; a coil disposed on the bobbin; a magnet facing the coil; a base disposed below the housing; a substrate disposed between the housing and the base; an elastic member disposed on the bobbin and coupled to the bobbin and the housing; and a support member coupled to the housing and the substrate. The elastic member includes an external part coupled to the housing, an internal part coupled to the bobbin, a connection part connecting the external part and the internal part. The bobbin includes a groove. The internal part of the elastic member includes a coupling hole. The coupling hole of the internal part includes a first area formed at a position corresponding to the groove, and a second area extending from the first area. An adhesive for fixing the elastic member to the bobbin is disposed in the coupling hole.