Segmented Lens Suspension for Resonance-Stable Camera Modules
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Solution Overview
Problem
The existing lens moving apparatuses in ultra-compact digital cameras face issues with resonance caused by mechanical vibration during autofocusing and camera shake correction, and they often suffer from assembly defects due to adhesive bonding.
Innovation Solution
A lens moving apparatus is designed with a bobbin having a first coil on its outer surface, a housing with a magnet, an upper elastic member divided into parts for increased rigidity, and a support member that allows the housing to move, along with a camera module that includes this apparatus and an image sensor, to suppress resonance and improve assembly precision.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the upper elastic member is made more rigid to suppress resonance, then vibration suppression improves, but assembly precision deteriorates due to adhesive bonding difficulties
Solution Approach 1:
The upper elastic member is divided into multiple parts (first upper elastic member and second upper elastic member) arranged in parallel. This segmentation allows each part to be bonded separately to the housing, improving assembly precision while collectively providing sufficient rigidity to suppress mechanical resonance in the lens moving apparatus.
2Device complexity
If adhesive bonding is used to assemble parts, then device complexity is reduced, but assembly defects increase due to adhesive protrusions
Solution Approach 1:
The lower surface of the base is designed with a recessed portion at the specific location where the printed circuit board is bonded. This local structural modification allows excess adhesive to be contained within the recessed area, preventing adhesive protrusions on the external surface while maintaining the simplicity of adhesive bonding for assembling multiple parts.
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 effectively reduces mechanical resonance and assembly defects by enhancing the elastic modulus and rigidity of the upper elastic member, allowing for stable autofocus and hand-tremor correction while preventing adhesive protrusions on the base surface.
Implementation Method 1
a bobbin (110) having a first coil (120) arranged on an outer circumferential surface thereof... a first magnet (130) fixed to the housing (140), a second coil (230) arranged on a lower side of the first magnet (130) to face the first magnet (130)
Implementation Method 2
an upper elastic member (150) disposed on an upper side of the housing (140)... the upper elastic member (150) is divided into a plurality of parts
Data Source
AI summary
A lens moving apparatus, according to one embodiment, comprises: a bobbin having a first coil installed on the outer circumferential surface thereof; a location detection sensor equipped to the bobbin; a housing in which the bobbin is provided; an upper elastic member disposed on the upper side of the housing; and a support member that supports the housing such that the housing can move in a second or third direction that is perpendicular to a first direction, wherein the upper elastic member is divided into a plurality of parts, at least two of which are disposed parallel to each other on the x-y plane in the second or third direction and are disposed such that end portions thereof face each other.