Camera Actuator Coil Layout for Slim OIS and Zoom Modules
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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 magnetic field interference between actuators, limiting lens movement and image quality in low-light conditions.
Innovation Solution
A camera actuator with a driving coil design featuring varying pattern areas and a curved shape to increase lens assembly movement, separate magnets to prevent interference, and optical path redirection to maintain functionality without increasing size.
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 in low-light conditions is improved, but the space occupied by the actuator for OIS increases, making it difficult to ensure sufficient space for lens movement
Solution Approach 1:
The patent applies dimensionality change by transitioning from a conventional planar coil structure to a three-dimensional folded coil structure. The coil is folded multiple times to create a compact configuration that occupies less lateral space while maintaining the required electromagnetic interaction volume, thereby resolving the contradiction between lens size and actuator space requirements
Solution Approach 2:
The folded coil structure implements a nesting principle where the coil windings are arranged in a compact, space-efficient manner within the actuator housing. The multiple folds create a nested configuration that maximizes the use of available vertical space while minimizing the lateral footprint, allowing sufficient space for both the lens and its movement
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 between the magnets
Solution Approach 1:
The patent introduces magnetic shielding plates as intermediary elements positioned between the OIS magnet and the AF/zoom magnets. These shielding plates act as mediators that redirect and contain magnetic field lines, preventing direct interference between adjacent magnets while allowing the device to maintain a compact form factor
Solution Approach 2:
The patent modifies the magnetic field distribution parameters by introducing shielding structures that alter the field geometry. The shielding plates change the magnetic field parameters (direction, intensity distribution) in the regions between magnets, transforming the harmful interference pattern into a controlled field configuration that enables close magnet placement
3Device complexity
If a conventional planar driving coil is used, then the structure is simple, but the moving distance of the lens assembly is limited
Solution Approach 1:
The patent applies curvature principles by folding the coil into a three-dimensional configuration with multiple bends and angles. This folded structure creates a more complex geometric form that enables greater electromagnetic force generation, thereby increasing the lens assembly moving distance while maintaining reasonable structural complexity
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 precise optical image stabilization and high-magnification zoom in ultra-slim, ultra-small cameras without increasing thickness or causing magnetic interference, ensuring high-resolution image quality.
Implementation Method 1
a driving unit configured to move the first lens assembly and the second lens assembly, wherein the driving unit includes a driving coil and a driving magnet facing the driving coil
Data Source
AI summary
Disclosed in an embodiment of the present invention is a camera actuator comprising: a housing; a first lens assembly and a second lens assembly, moving in an optical axis direction with respect to the housing; and a driver unit for moving the first lens assembly and the second lens assembly, wherein the driver unit comprises: a driver coil; and a driver magnet facing the driver coil, and the driver coil comprises: a first pattern area; and a second pattern area arranged in a direction perpendicular to the first pattern area, wherein a width of the first pattern area differs from a width of the second pattern area.