Lens-Shift Camera Module With Damping for Larger OIS Correction
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Solution Overview
Problem
Existing camera modules face limitations in correcting large shakes or hand shaking due to limited correction angles and lack of damping members for reducing high-frequency noise, particularly in lens shift type OIS structures.
Innovation Solution
Incorporating a damping member made of vibration or shock-absorbing material between a fixed structure with an image sensor and a movable structure containing a lens, and utilizing a driving member with coils and magnets to move the lens unit relative to the optical axis and perpendicular to it, enhancing optical image stabilization and autofocus operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a lens shift type OIS structure is used to correct shake, then image stabilization function is provided, but correction angle is limited to a specified angle (e.g., about 1.5°) or less
Solution Approach 1:
The patent divides the OIS correction mechanism into two independent parts: a first carrier that moves the lens assembly in the optical axis direction, and a second carrier that moves the first carrier in a direction perpendicular to the optical axis. This segmentation allows each carrier to be optimized for its specific movement direction, enabling larger overall correction angles while maintaining effective stabilization.
Solution Approach 2:
The patent introduces an additional degree of freedom by adding the first carrier's optical axis movement to the second carrier's perpendicular movement. This dimensional expansion transforms the limited single-axis correction into a two-dimensional correction system, significantly increasing the effective correction angle beyond the traditional 1.5° limitation.
2Reliability
If a lens shift type OIS structure is used, then image stabilization is achieved, but high-frequency noise and strong impact cannot be reduced due to lack of damping member
Solution Approach 1:
The patent incorporates a damping member between the first carrier and the second carrier to provide beforehand cushioning against high-frequency vibrations and strong impacts. This damping member absorbs and dissipates harmful mechanical energy before it can affect the lens assembly and image sensor, protecting the system from noise and shock while maintaining stabilization performance.
3Object-affected harmful factors
If damping member is added to reduce noise and impact, then high-frequency noise reduction is achieved, but camera module height may increase
Solution Approach 1:
The patent employs a thin-film damping member that provides effective vibration damping while occupying minimal space. This thin-film structure achieves the required noise reduction functionality without significantly increasing the camera module's height, maintaining a compact overall design.
Solution Approach 2:
The patent optimizes the damping member's material properties and geometric parameters to achieve maximum damping efficiency at minimal thickness. By carefully selecting damping coefficient, layer thickness, and material composition, the system achieves effective high-frequency noise reduction while minimizing the increase in camera module height.
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 solution reduces noise and alleviates external shocks, allowing for improved OIS correction angles without increasing the camera module's height, thereby enhancing image stabilization and autofocus performance.
Implementation Method 1
a first damping member comprising a vibration or shock absorbing material, at least part of which is disposed between the stopper and the first carrier
Implementation Method 2
a driving member configured to move all or part of the lens unit and includes a plurality of coils disposed on the camera housing and a plurality of magnets disposed on the lens unit
Data Source
AI summary
An electronic device according to an embodiment of the disclosure includes: a housing and a camera module, at least part of which is disposed in the housing. The camera module includes a camera housing, a sensor assembly including an image sensor and is fixed to the camera housing, and a lens unit, at least part of which is accommodated in a space formed by the camera housing and the sensor assembly, the lens unit being configured such that all or part of the lens unit moves relative to the camera housing and the sensor assembly. The lens unit includes a lens assembly including a lens, a first carrier to which the lens assembly is coupled, a second carrier in which the first carrier is accommodated to be movable in a direction perpendicular to an optical axis of the lens, a stopper coupled to the second carrier to cover at least part of the first carrier, and a first damper, at least part of which is disposed between the stopper and the first carrier.