Integrated Camera Actuator Layout for Stable OIS Tilting
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Solution Overview
Problem
Existing camera modules face challenges in securing sufficient space for optical image stabilizer (OIS) actuators due to space constraints, particularly in ultra-slim and ultra-small designs, and magnetic field interference occurs when multiple functions like OIS, auto focusing (AF), and zooming are integrated, leading to oscillation and reduced light reception.
Innovation Solution
A camera actuator design incorporating a housing, mover, tilting guide unit, elastic member, and damper member to suppress oscillation, enhance reliability and durability, and prevent magnetic field interference, allowing for stable tilting and improved light reception.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If actuators for OIS are disposed around the lens to enable tilting, then optical image stabilization function is achieved, but space constraint prevents sufficient arrangement in ultra-slim and ultra-small camera modules
Solution Approach 1:
The patent combines the OIS actuator and the AF/zoom actuator into a single integrated actuator structure. The housing contains both the OIS mover that tilts the lens and the AF/zoom mover that moves the lens along the optical axis, eliminating the need for separate actuator spaces and enabling ultra-slim camera module design while maintaining OIS functionality
Solution Approach 2:
The integrated actuator performs multiple functions: OIS (optical image stabilization) through lens tilting, AF (auto focusing) through lens movement along optical axis, and zooming through focal length adjustment. This multi-functional design allows a single actuator to replace what would traditionally require multiple separate actuators, solving the space constraint problem
2Illumination intensity
If lens size is increased to increase light reception in high pixel density cameras, then image quality improves, but space for OIS actuators is reduced
Solution Approach 1:
By merging the OIS actuator with the AF/zoom actuator into a single integrated structure, the patent reduces the total volume required for actuation mechanisms. This allows the lens diameter to be increased for better light reception in high pixel density cameras without proportionally increasing the overall module size, as the actuator space is efficiently shared
3Device complexity
If OIS magnet and AF or zoom magnet are disposed close to each other, then integrated actuator design is achieved, but magnetic field interference occurs
Solution Approach 1:
The patent separates the magnetic fields by extracting or isolating the OIS magnet from the AF/zoom magnet within the integrated actuator. The OIS magnet is positioned to interact only with the OIS coil for lens tilting, while the AF/zoom magnet interacts with the AF/zoom coil for lens movement, preventing cross-interference despite close proximity
Solution Approach 2:
The patent uses magnetic shields or non-magnetic barriers as intermediaries between the OIS magnet and AF/zoom magnet. These intermediary elements block or redirect magnetic field lines to prevent interference between the two magnetic systems while allowing both functions to operate within the integrated actuator structure
4Stability of the object's composition
If elastic member is used to provide retention force in OIS actuator, then tilting stability is improved, but oscillation occurs during OIS operation
Solution Approach 1:
The patent converts the harmful oscillation caused by the elastic member into a beneficial damping effect. By introducing a damper member that works in conjunction with the elastic member, the system transforms the elastic rebound that causes oscillation into a controlled damping action that reduces oscillation while maintaining the retention force needed for tilting stability
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 design enables efficient arrangement of OIS actuators without increasing module size, stabilizes tilting movements, prevents magnetic interference, and ensures sufficient light reception, making it suitable for ultra-slim, ultra-small, and high-resolution cameras.
Implementation Method 1
a damper member coupled to at least one group of the elastic member the housing
Implementation Method 2
an elastic member that allows the tilting guide unit to be in close contact with the mover
Data Source
AI summary
Disclosed according to an embodiment of the present invention is a camera actuator comprising: a housing; a mover which is disposed in the housing; a tilting guide unit which is disposed between the housing and the mover; a driving unit which is disposed in the housing to drive the mover; an elastic member by which the tilting guide unit and the mover come into close contact with each other; and a damper member which is disposed between the elastic member and at least one of the mover and the housing.