Dual Camera Module Hall Sensor Layout for Magnetic Interference
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Solution Overview
Problem
Dual camera modules face challenges when two camera modules are arranged in parallel, as the magnetic forces of one camera's magnet can adversely affect the other, leading to issues like the bobbin being disengaged from its normal position or tilting.
Innovation Solution
A dual camera module configuration is proposed, where each lens driving device includes a housing, a bobbin, a driving magnet, a coil, a support member, a sensing magnet, a compensation magnet, and a Hall sensor. The Hall sensors are strategically placed to minimize mutual magnetic influence between the two camera modules.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If two camera modules are arranged in parallel to achieve dual camera functionality, then the performance of dual camera is improved, but the magnetic force of one camera's magnet adversely affects the other camera module, causing the bobbin to be disengaged or tilted
Solution Approach 1:
A non-magnetic shield plate is introduced as an intermediary component between the two camera modules. This shield plate blocks and redirects the magnetic field lines generated by the driving magnet of one camera module, preventing them from directly affecting the bobbin of the other camera module. The shield plate acts as a magnetic field mediator that allows the dual camera configuration to function while protecting against magnetic interference.
Solution Approach 2:
The patent changes the magnetic field distribution parameters by positioning the Hall sensor at specific locations relative to the driving magnet and bobbin. By adjusting the sensor's spatial parameters and the shield plate's position, the magnetic field strength at critical points is controlled to remain below threshold values that would cause bobbin disengagement or tilting, thus maintaining system reliability.
2Productivity
If two camera modules are arranged in parallel, then dual camera performance is improved, but the magnetic interference causes bobbin disengagement from normal position
Solution Approach 1:
The non-magnetic shield plate serves as a protective intermediary that absorbs and redirects magnetic field lines, preventing them from reaching the bobbin of the adjacent camera module. This intermediary structure allows the system to maintain high productivity through dual camera operation while filtering out harmful magnetic interference.
Solution Approach 2:
The patent converts the harmful magnetic field into a controlled phenomenon by using the shield plate to redirect field lines along predictable paths. The magnetic force that would otherwise cause bobbin disengagement is instead channeled through the shield plate, where its effect is neutralized or redirected away from sensitive components, turning a harmful factor into a manageable element.
3Adaptability or versatility
If two camera modules are arranged in parallel, then dual camera performance is improved, but the magnetic force causes bobbin tilting phenomenon
Solution Approach 1:
The shield plate acts as a stabilizing intermediary that creates a magnetic field barrier between the two camera modules. This barrier prevents asymmetric magnetic forces from acting on the bobbin, thereby maintaining proper alignment and preventing tilting. The intermediary structure ensures that the bobbin remains stable and properly oriented during dual camera operation.
Solution Approach 2:
The shield plate provides a counteracting magnetic field effect that balances the forces acting on the bobbin. By strategically positioning the shield plate and Hall sensor, the system creates a counterbalancing magnetic influence that offsets the tilting forces, maintaining bobbin alignment stability while preserving dual camera 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
This configuration effectively minimizes the mutual influence of magnetic forces between the two camera modules, allowing for closer spacing and maintaining the normal position and alignment of the bobbins, thus enhancing the performance and stability of the dual camera module.
Implementation Method 1
a first Hall sensor disposed at the first housing to detect the first sensing magnet
Implementation Method 2
a first driving magnet disposed at the first housing, a first coil disposed at the first bobbin to be opposite to the first driving magnet
Implementation Method 3
a first compensation magnet disposed at the first bobbin to be symmetrical with the first sensing magnet about the first optical axis
Data Source
AI summary
The present embodiment relates to a dual camera module, in which a first lens driving device is spaced apart from and arranged in parallel with a second lens driving device, a first Hall sensor of the first lens driving device is disposed is disposed at a corner portion which is spaced most apart from a second sensing magnet of the second lens driving device, among a plurality of corner portions of a first housing; and a second Hall sensor of the second lens driving device is disposed at a corner portion which is spaced most apart from the first Hall sensor, among a plurality of corner portions of a second housing.