Camera Actuator Coil-Magnet Overlap for Slim OIS Tilt Stability
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Solution Overview
Problem
Existing camera modules face challenges in securing sufficient space for optical image stabilization (OIS) actuators due to space constraints, especially in ultra-slim and ultra-small designs, and suffer from magnetic field interference and posture differences affecting accuracy and energy efficiency.
Innovation Solution
A camera actuator design with a housing, mover, and driving part that includes magnets and coils, where magnets and coils are positioned to minimize interference and optimize space usage, allowing for precise tilting and rotation without increasing module size, and positioning the center of gravity adjacent to the rotational axis to reduce moment changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the number of pixels in the image sensor is increased to improve resolution, then the image quality is improved, but the amount of light received by each pixel decreases and hand shaking becomes more severe
Solution Approach 1:
The patent replaces mechanical stabilization methods with an optical system that uses a reflective member (mirror) to redirect light. By tilting the reflective member using electromagnetic actuators (coils and magnets), the system compensates for hand shaking without requiring larger pixels or mechanical movement of the entire camera module, thus maintaining high resolution while correcting instability.
2Object-affected harmful factors
If an actuator for OIS is disposed around the lens to enable image stabilization, then the hand shaking correction function is improved, but the space required for the camera module increases
Solution Approach 1:
The patent merges the OIS actuator functionality with the existing lens structure by integrating coils and magnets directly into the lens assembly. The actuator uses the lens holder as part of its structure, and the magnetic components are positioned to work with the lens optical path, thereby achieving image stabilization without adding significant volume to the camera module.
Solution Approach 2:
The patent positions the OIS actuator components in a configuration that utilizes the radial and axial dimensions around the optical axis rather than requiring additional lateral space. The coils and magnets are arranged concentrically around the optical path, allowing the actuator to function within the existing cylindrical form factor of the lens assembly.
3Illumination intensity
If the size of the lens is increased to increase the amount of received light, then the light gathering capability is improved, but the space occupied by the OIS actuator increases
Solution Approach 1:
The patent optimizes the local arrangement of magnetic components within the actuator structure. By strategically positioning magnets and coils in specific locations around the optical path and using different magnetic strengths in different zones, the system achieves effective OIS operation with a compact lens size that still gathers sufficient light, without requiring a larger overall actuator volume.
4Volume of moving object
If an OIS magnet and an AF or zoom magnet are disposed close to each other to save space, then the camera module size is reduced, but magnetic field interference occurs
Solution Approach 1:
The patent introduces magnetic shielding materials and structural barriers between the OIS magnets and AF/zoom magnets. These intermediary elements redirect or contain the magnetic field lines, preventing them from interfering with adjacent magnetic components while maintaining the compact overall structure of the camera module.
Solution Approach 2:
The patent segments the magnetic field zones by using magnetic shields and structural partitions that divide the space around different magnets. This segmentation isolates the OIS magnetic field from the AF/zoom magnetic field, allowing both systems to operate independently in close proximity without mutual interference.
5Ease of manufacture
If the actuator structure is simplified to reduce manufacturing complexity, then the ease of manufacture is improved, but the stiffness of the housing decreases
Solution Approach 1:
The patent uses composite construction for the housing, combining materials with different mechanical properties to achieve both sufficient stiffness and ease of manufacture. The housing may incorporate reinforced ribs, optimized wall thicknesses, or composite materials that provide high stiffness-to-weight ratios without requiring complex manufacturing processes.
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
Enables accurate rotation driving with reduced errors, improved reliability, and energy efficiency, while allowing for ultra-slim, ultra-small, and high-resolution camera applications without magnetic interference.
Implementation Method 1
a driving part disposed in the housing and configured to drive the mover, wherein the driving part includes at least one magnet and at least one coil
Implementation Method 2
a tilting guide part configured to guide tilting of the mover
Implementation Method 3
positioning the center of gravity adjacent to the rotational axis to reduce moment changes
Data Source
AI summary
An embodiment of the present invention provides a camera actuator comprising: a housing; a mover disposed inside the housing and including an optical member; a tilting guide part for guiding tilting of the mover; and a driving part disposed inside the housing and driving the motor, wherein, the driving part comprises at least one magnet and at least one coil, and the at least one magnet at least partially overlaps the tilting guide part in a first direction perpendicular to an optical axis or in a second direction perpendicular to the optical axis.