Camera Module Hand-Shake Correction Using Magnetic Actuation
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Solution Overview
Problem
Miniature camera modules in mobile devices suffer from image degradation due to hand-shake, and existing optical image stabilization (OIS) actuators are prone to deformation under external forces, leading to reliability issues and high power consumption.
Innovation Solution
A camera module design featuring first and second frames with hand-shake correction units that generate driving forces perpendicular to the optical axis, utilizing magnetic and coil interactions, and ball bearing systems to support movement, allowing for orthogonal movement and reducing power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a suspension wire is used to support the lens module in the OIS actuator, then the lens module can be moved perpendicular to the optical axis, but the suspension wire becomes vulnerable to external impacts and deformation, reducing product reliability
Solution Approach 1:
The patent replaces the mechanical suspension wire system with a magnetic field-based OIS actuator. The actuator uses magnetic forces generated by coils to move the lens module, eliminating the need for physical suspension wires that are vulnerable to deformation and external impacts.
Solution Approach 2:
The patent changes the operational parameters by using electromagnetic fields instead of mechanical connections. The OIS actuator controls lens module position through magnetic force parameters (current, magnetic field strength) rather than mechanical tension and physical support.
2Reliability
If an OIS actuator is used to correct hand-shake, then image quality is improved, but a large amount of power is consumed
Solution Approach 1:
The patent implements partial action by activating the OIS actuator only when hand-shake correction is needed. The control unit detects hand-shake conditions and activates the actuator selectively rather than continuously, reducing overall power consumption while maintaining image quality when required.
Solution Approach 2:
The OIS actuator operates periodically based on detected hand-shake movements. The system continuously monitors for hand-shake conditions and activates the actuator in periodic intervals only when correction is necessary, rather than maintaining continuous operation.
3Reliability
If the housing sidewalls are made thicker to resist external impacts, then product reliability is improved, but the camera module size increases
Solution Approach 1:
The patent applies local quality by making only the necessary sidewalls thicker (those opposite to each other that need to accommodate the OIS actuator movement), rather than uniformly thickening all sidewalls. This provides sufficient impact resistance in critical areas while minimizing overall size increase.
Solution Approach 2:
The housing design uses asymmetric sidewall thicknesses where only specific sidewalls are thicker to accommodate the OIS actuator's operational requirements. This asymmetric design provides necessary structural support and impact resistance only where needed, optimizing the balance between reliability and compact size.
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 effectively corrects hand-shake, enhances product reliability by resisting external impacts, and minimizes power usage, enabling a compact camera module suitable for small spaces in portable devices.
Implementation Method 1
a hand-shake correction unit provided on the first frame or the second frame and configured to generate a driving force in a direction perpendicular to an optical axis of a lens
Implementation Method 2
The housing and the first frame may have a first ball bearing unit which is provided therebetween and is configured to roll in a first direction perpendicular to the optical axis
Data Source
AI summary
A camera module includes first and second frames accommodated in housing, and a hand-shake correction unit. The hand-shake correction unit is provided on the first frame or the second frame and configured to generate a driving force in a direction perpendicular to an optical axis of a lens accommodated in the first and second frames. Sidewalls of the housing opposite to each other comprise different thicknesses.