Lens Driving Structure for Slim OIS Camera Module Stability
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Solution Overview
Problem
The challenge of maintaining an effective elastic member length for optical image stabilization (OIS) functions in thinner smartphones, while preventing lens deviation due to shock, is exacerbated by the miniaturization and high-pixelation demands of camera modules.
Innovation Solution
A lens driving device with a housing, bobbin, coil, magnet, and elastic members, including a terminal member with connectors and support members, is designed to maintain elastic deformability and reduce overall length, inhibiting lens deviation during handshake corrections.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If the camera module is miniaturized to fit thinner smartphones, then the overall device thickness is reduced, but the elastic member length becomes insufficient for effective OIS function
Solution Approach 1:
The patent repositions the magnet from the mover to the stator, and places the coil on the mover. This spatial rearrangement allows the elastic member to be positioned more efficiently within the z-axis direction, maximizing its effective length for OIS operation while maintaining a compact overall module thickness. The dimensionality change in component layout enables both miniaturization and preserved OIS functionality.
2Reliability
If the elastic member length is increased to improve OIS function, then the image stabilization performance is enhanced, but the camera module thickness increases
Solution Approach 1:
By changing the spatial arrangement of components - specifically placing the magnet on the stator and coil on the mover - the patent enables the elastic member to achieve sufficient effective length for OIS operation within a reduced z-axis thickness. This dimensional reorganization allows the elastic member to function effectively without increasing overall module thickness.
Solution Approach 2:
The stator is designed to integrate multiple functions: it supports the magnet for electromagnetic interaction, provides structural mounting for the elastic member, and serves as a stable reference frame for OIS operation. This multi-functionality reduces the need for separate components, enabling compact design while maintaining OIS effectiveness.
3Reliability
If the lens module is made more stable to prevent shock-induced deviation, then image quality is improved, but the device complexity increases
Solution Approach 1:
The patent combines the magnet mounting function with the stator structure, eliminating the need for separate magnet holders or additional stabilizing components. The stator serves as both the electromagnetic field generator support and the mechanical stability reference, reducing overall device complexity while maintaining lens stability during shock events.
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 allows for a slim-structured lens driving device that effectively stabilizes images by reducing tilt angles and preventing lens disengagement, enhancing image quality and durability.
Implementation Method 1
a first coil disposed on the bobbin; a magnet which is disposed on the housing and faces the first coil
Data Source
AI summary
The present embodiment of the present invention relates to a lens driving device, comprising: a housing; a bobbin disposed in the housing; a first coil disposed on the bobbin; a magnet which is disposed on the housing and faces the first coil; a base disposed under the housing; a substrate which is disposed on an upper surface of the base and comprises a circuit member including a second coil facing the magnet; an upper elastic member disposed on an upper portion of the bobbin and coupled to the bobbin and the housing; a support member coupled to the upper elastic member; and a terminal member elastically connecting the support member with the substrate, wherein the terminal member comprises; a first connector coupled to the substrate; and a second connector coupled to the support member; and wherein the second connector is disposed at a position lower than the first connector.