Camera Actuator With Nested OIS and Magnetic Isolation
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Solution Overview
Problem
Existing camera devices face challenges in achieving ultra-slim, ultra-small, and high-resolution designs due to space constraints for optical image stabilizers (OIS) and potential magnetic field interference between OIS and auto focusing (AF) or zoom actuators, while also requiring improved position detection accuracy and resistance to impacts.
Innovation Solution
A camera actuator design with a housing, first and second lens assemblies, and a driving unit that allows for optical axis movement, utilizing non-overlapping bonding members and a driving magnet-coil-sensor configuration to prevent magnetic interference and optimize space usage, enabling precise OIS and AF functions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the lens size is increased to increase the amount of received light, then the image quality is improved, but the space occupied by the actuator for OIS increases
Solution Approach 1:
The patent implements nesting by placing the OIS actuator inside the lens assembly structure. The actuator is integrated into the lens barrel, utilizing the existing space within the lens assembly rather than occupying separate external space. This allows the lens to maintain its size for adequate light collection while the actuator is accommodated within the same structural envelope.
Solution Approach 2:
The patent transitions from a planar arrangement of components to a three-dimensional integrated structure. By moving the actuator into the longitudinal dimension within the lens barrel and utilizing the depth of the lens assembly, the design accommodates both the lens and actuator without increasing the overall footprint area of the camera module.
2Volume of moving object
If the OIS magnet and AF or zoom magnet are disposed close to each other, then the device size is reduced, but magnetic field interference occurs
Solution Approach 1:
The patent extracts the magnetic components from their traditional close-proximity arrangement and separates them into distinct locations. The OIS magnet is positioned in the lens barrel while the AF/zoom magnet is located in a separate actuator assembly. This spatial separation eliminates magnetic field interference between the different functional magnets while maintaining compact overall device dimensions through efficient space utilization.
Solution Approach 2:
The patent introduces non-magnetic spacer structures and partition walls as intermediary elements between the OIS magnet and AF/zoom magnet. These intermediaries physically separate the magnetic fields, preventing interference while allowing the magnets to remain in close proximity for compact design. The spacers act as magnetic shields that contain each magnet's field within its own local region.
3Reliability
If the actuator for OIS is disposed around the lens, then the OIS function is achieved, but the space constraint in ultra-slim and ultra-small camera devices is not satisfied
Solution Approach 1:
The patent embeds the OIS actuator within the lens assembly structure, nesting the actuator components inside the lens barrel. This integration allows the actuator to be disposed around the lens in a three-dimensional configuration rather than requiring external planar space. The actuator utilizes the longitudinal space within the lens assembly, enabling ultra-slim and ultra-small camera device designs while maintaining reliable 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 design enables efficient OIS function in ultra-slim cameras without increasing size, prevents magnetic interference, and enhances position detection accuracy with low power consumption, while maintaining high-resolution imaging capabilities.
Implementation Method 1
a bonding member in contact with at least one of the first outer side surface and the second outer side surface
Implementation Method 2
a driving unit configured to move the first lens assembly and the second lens assembly
Data Source
AI summary
An embodiment of the present invention discloses a camera actuator comprising: a housing; a first lens assembly and a second lens assembly moving in the optical axis direction in the housing; and a driving unit for moving the first lens assembly and the second lens assembly, wherein the first lens assembly includes a first outer side surface, and the second lens assembly includes a second outer side surface which faces the first outer side surface and at least partially overlaps the first outer side surface in the optical axis direction and a bonding member that is in contact with at least one of the first outer side surface and the second outer side surface.