Lens Driving Bobbin Structure for Foreign Matter Capture
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Solution Overview
Problem
Conventional camera modules face issues with foreign matter generation due to bobbin movement, leading to scattering and affecting lens and image sensor performance, and terminal deformation from impact, while also limiting the reduction of bezel size in optical devices.
Innovation Solution
A lens driving device with a bobbin structure that captures foreign matters using grooves and protrusions, and an elastic member system to minimize terminal deformation, allowing for autofocus functionality and bezel size reduction by shifting the optical axis, and enhanced pull-out force through a stable cover-base connection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the bobbin moves during autofocus operation, then the autofocus function is achieved, but foreign matters are generated and scattered affecting lens and image sensor
Solution Approach 1:
The patent converts the harmful foreign matters generated during bobbin movement into trapped particles by designing grooves on the bobbin surface. These grooves capture and retain the foreign matters, preventing them from scattering and affecting the lens and image sensor, thus transforming a harmful byproduct into a contained element that no longer causes damage
Solution Approach 2:
The grooves on the bobbin act as an intermediary structure between the moving bobbin and the surrounding environment. They serve as a mediating mechanism that captures foreign matters generated during movement, preventing direct contact and scattering of these particles with the lens and image sensor
2Ease of manufacture
If the terminal for providing current to the coil is designed conventionally, then electrical connection is achieved, but the terminal deforms due to impact
Solution Approach 1:
The patent applies beforehand cushioning by designing the terminal with an elastic member that can absorb and dissipate impact forces before they cause deformation. This pre-engineered cushioning mechanism protects the terminal structure from damage during operational impacts
3Area of stationary object
If the cover glass is moved to the edge of the frame to reduce bezel size, then the display panel width is increased, but the cover may separate from the lens driving device due to external impact
Solution Approach 1:
The patent addresses cover separation by introducing a multi-dimensional connection system. The cover is connected to the base through multiple lateral plates extending in different directions, creating a stable structural framework that resists separation forces from external impacts while allowing the cover glass to be positioned at the frame edge
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
Effectively captures foreign matters, prevents re-scattering, minimizes terminal deformation, reduces bezel size for wider display panels, and enhances the stability of the camera module and optical device.
Implementation Method 1
the autofocus function can be performed using the electromagnetic interaction between a coil and a magnet
Data Source
AI summary
The first embodiment of the present invention relates to a lens driving device comprising: a cover including an upper plate and a lateral plate extending from the upper plate; a bobbin arranged to move in a first direction within the cover; a coil arranged at the bobbin; a magnet which is arranged at the cover and faces the coil; and a base which is arranged below the bobbin and coupled to the cover, wherein the bobbin includes: a first surface facing the upper plate of the cover; a second surface which faces upwards and is arranged lower than the first surface; a first protrusion which is arranged at the first surface of the bobbin and overlapped with the upper plate of the cover in a first direction; and a groove concavely formed downwards on the second surface of the bobbin.