Lens Driving Bobbin Structure for Debris Trapping and Bezel Reduction
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Solution Overview
Problem
Conventional camera modules face issues such as foreign matter scattering due to bobbin grounding, deformation of terminals, and challenges in reducing bezel size to accommodate wider display panels, which affect lens performance and optical device design.
Innovation Solution
A lens driving device with a bobbin structure that captures foreign matters and minimizes terminal deformation, featuring grooves and protrusions to trap debris, and shifts the optical axis to reduce bezel size, incorporating a cover and base design for stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the bobbin is grounded to provide electrical connection, then electrical conductivity is improved, but foreign matters are generated and scattered affecting lens and image sensor
Solution Approach 1:
A dust trap structure is introduced as an intermediary component between the bobbin and the lens/image sensor. This dust trap captures foreign matters generated during bobbin grounding operations, preventing them from scattering and contaminating the optical components while maintaining electrical connection functionality.
2Reliability
If the terminal is designed to provide current to the coil, then electrical function is achieved, but the terminal deforms under impact
Solution Approach 1:
The terminal structure incorporates beforehand cushioning design with extended portions that can deform elastically under impact. This allows the terminal to absorb impact energy through controlled deformation of the extended portions, protecting the main terminal body and maintaining electrical connectivity even under external impact conditions.
3Area of stationary object
If the cover glass is moved to the edge of the frame to reduce bezel size, then display panel width is increased, but the optical axis must be shifted from center
Solution Approach 1:
The lens driving device employs asymmetric design in positioning the optical axis and associated components. By deliberately shifting the optical axis from the center and asymmetrically arranging the lens module and drive mechanisms, the design enables cover glass to be positioned at the frame edge, maximizing display panel width while maintaining functional optical alignment.
4Reliability
If the cover is designed to protect built-in parts, then protection function is achieved, but the cover pulls out due to external impact
Solution Approach 1:
The cover retention mechanism extends from simple planar attachment to three-dimensional engagement. The cover includes downwardly extending portions that fit into corresponding grooves on the housing, creating multi-dimensional mechanical interlocking. This prevents the cover from pulling out under external impact while maintaining its protective function.
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 and retains foreign matters, minimizes terminal deformation, and reduces bezel size by shifting the optical axis, enhancing lens performance and enabling wider display panels in optical devices.
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.