Folded Camera Module Magnetic Centering for Quiet OIS Motion
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Solution Overview
Problem
Existing camera modules in portable electronic devices face challenges in ensuring reliable operation of autofocus, image stabilization, and zoom functions while mitigating mechanical collisions and noise between lens mechanisms, particularly in low-end devices.
Innovation Solution
A camera module design incorporating OIS driving magnets and centering magnets to stabilize the movable holder, using magnetic forces to maintain alignment and prevent collisions, combined with OIS driving coils for electromagnetic stabilization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the movable holder is allowed to move freely for autofocus and image stabilization operations, then the camera module achieves functional versatility, but mechanical collisions and abnormal noise occur between the movable holder and housing
Solution Approach 1:
The patent replaces the traditional mechanical centering mechanism with a magnetic field-based centering system. OIS centering magnets mounted on the housing interact with OIS driving magnets on the movable holder through magnetic attraction forces, eliminating the need for physical mechanical contacts. This substitution of magnetic fields for mechanical structures prevents collisions and abnormal noise while maintaining the movable holder's center position during autofocus and image stabilization operations
Solution Approach 2:
The patent introduces magnetic fields as an intermediary between the housing and the movable holder. The OIS centering magnets and OIS driving magnets create a magnetic field that acts as a non-contact mediator to maintain the center position of the movable holder. This intermediary magnetic field enables the movable holder to move freely for autofocus and image stabilization while being continuously centered without direct mechanical contact, thus preventing collisions and abnormal noise
2Manufacturing precision
If mechanical centering mechanisms are used to maintain the movable holder's center position, then centering precision is achieved, but mechanical noise and friction are introduced
Solution Approach 1:
The patent replaces mechanical centering mechanisms with a magnetic field-based centering system. OIS centering magnets mounted on the housing interact with OIS driving magnets on the movable holder through magnetic attraction forces, eliminating the need for physical mechanical contacts. This substitution of magnetic fields for mechanical structures prevents collisions and abnormal noise while maintaining the movable holder's center position during autofocus and image stabilization operations
Solution Approach 2:
The patent changes the physical state and interaction mode from mechanical contact to magnetic field interaction. By using magnetic fields instead of mechanical structures, the system transitions from a contact-based centering mechanism to a non-contact magnetic attraction system. This parameter change eliminates friction and mechanical noise while maintaining precise centering control of the movable holder
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
Enhances the reliability of autofocus, image stabilization, and zoom operations by reducing mechanical collisions and noise, ensuring smooth functionality in low-end devices.
Implementation Method 1
OIS centering magnets provided adjacent to each other at a predetermined distance in a direction that intersects the OIS driving magnets, and disposed to apply magnetic forces to each other
Implementation Method 2
OIS driving coils, disposed to face the OIS driving magnets, and configured to apply electromagnetic forces to each other
Data Source
AI summary
A camera module is provided. The camera module includes a housing having an internal space; a folded module including a reflective member configured to change a path of light incident from the outside, and a movable holder on which the reflective member is mounted, the movable holder being disposed in the internal space and movably supported on an inner wall of the housing; a lens module including a lens barrel having a plurality of lenses aligned in an optical axis direction so that light reflected by the reflective member passes through the plurality of lenses; OIS driving magnets mounted on the movable holder; and OIS centering magnets provided adjacent to each other at a predetermined distance in a direction that intersects the OIS driving magnets, and disposed to apply magnetic forces to each other.