Lens Driver Corner Conductor Layout to Prevent OIS Short-Circuits
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Solution Overview
Problem
Conventional camera modules with Optical Image Stabilization (OIS) functions face design limitations due to short-circuits from solder balls, limited contact area between OIS springs and bases, and spatial constraints, which affect the performance and reliability of the camera module.
Innovation Solution
A lens driving device with an optimized design that includes a conducting member positioned at the corner of the base to connect the OIS coil and substrate, reducing spatial restrictions and enhancing the contact area between the OIS spring and base, thereby preventing short-circuits and improving workability and reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If solder balls are used to electrically conduct substrate, then electrical connection is achieved, but short-circuit may be generated between OIS coil and other members
Solution Approach 1:
The patent introduces a conducting member as an intermediary component between the substrate and the OIS spring. This conducting member has a specific structure with a first contact portion contacting the substrate and a second contact portion contacting the OIS spring, thereby mediating the electrical connection and preventing direct contact between solder balls that could cause short-circuits.
2Volume of moving object
If OIS spring and base contact area is limited, then device size is reduced, but contact area between OIS spring and base is limited
Solution Approach 1:
The conducting member extends in the vertical direction (thickness direction of the base) to provide sufficient contact area. By utilizing the thickness dimension of the base, the conducting member achieves adequate contact area between the OIS spring and substrate without increasing the planar footprint of the device.
3Adaptability or versatility
If conducting member is positioned at corner of base, then spatial restrictions are reduced, but manufacturing complexity increases
Solution Approach 1:
The conducting member is segmented into distinct portions: a first contact portion for contacting the substrate and a second contact portion for contacting the OIS spring. This segmentation allows the conducting member to be positioned at the corner of the base while maintaining clear functional zones, simplifying the manufacturing process by providing distinct contact areas.
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 spatial restrictions, prevents short-circuits, and enhances the contact area between the OIS spring and base, improving the reliability and performance of the camera module, even with increased resolution and reduced external size.
Implementation Method 1
a conducting member for electrically connecting the coil part to the substrate
Implementation Method 2
an OIS spring movably supporting a mover relative to a stator
Implementation Method 3
a coil part having a second coil disposed between the housing and the base so as to face the magnet
Data Source
AI summary
A lens driving device includes a housing; a bobbin disposed inside the housing so as to move in a first direction; a first coil disposed on the outer circumferential surface of the bobbin; a magnet disposed in the housing; a base disposed below the housing; a coil part having a second coil disposed between the housing and the base so as to face the magnet; a substrate disposed between the housing and the base; and a conducting member for electrically connecting the coil part to the substrate. The conducting member is disposed at a corner of the base.