Lens Driving Device Sensing Coil Bonding Reliability
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing lens driving devices face challenges in maintaining bonding reliability of sensing coils, achieving easy soldering, and optimizing electromagnetic force in micro-camera modules, particularly for low power consumption and miniaturization.
Innovation Solution
A lens driving device design featuring a housing with a bobbin, a first coil, magnets, upper and lower elastic members, and a sensing coil, where the sensing coil is strategically positioned on the housing to generate induced voltage, with a receiving groove and stepped parts for easy installation and reduced interference, allowing for improved electromagnetic interaction and bonding reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If Voice Coil Motor technology is applied to micro-camera modules, then power consumption is reduced and miniaturization is achieved, but bonding reliability of sensing coil deteriorates
Solution Approach 1:
A receiving groove is introduced as an intermediary structure between the housing and sensing coil. The groove receives and secures the sensing coil, acting as a mediator that improves bonding reliability without affecting the power consumption benefits of the Voice Coil Motor technology.
Solution Approach 2:
The receiving groove is pre-formed on the housing before the sensing coil is installed. This preliminary preparation of the mounting structure ensures proper positioning and secure bonding of the sensing coil, addressing the reliability issue before the actual assembly occurs.
2Force
If sensing coil is positioned to generate induced voltage by interaction with magnets, then electromagnetic force is improved, but interference with other components increases
Solution Approach 1:
The receiving groove is positioned at a specific location on the housing that is optimized for electromagnetic interaction with the magnets while maintaining spatial separation from other components. This localized positioning ensures strong electromagnetic force generation in the required region while minimizing interference elsewhere.
Solution Approach 2:
The sensing coil is arranged in a specific three-dimensional configuration within the receiving groove, utilizing spatial dimensions to optimize electromagnetic interaction while maintaining clearance from other components. The groove's geometry provides vertical and horizontal positioning that resolves the interference issue.
3Reliability
If sensing coil is installed on housing, then bonding reliability is enhanced, but soldering difficulty increases
Solution Approach 1:
The receiving groove is pre-formed on the housing to provide a prepared mounting location for the sensing coil. This preliminary preparation facilitates easier soldering by providing a defined structure for coil placement and connection, while still ensuring reliable bonding through the groove's securing mechanism.
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 enhances bonding reliability, facilitates easy soldering, and increases electromagnetic force, enabling efficient operation in micro-camera modules with improved performance and miniaturization.
Implementation Method 1
a sensing coil disposed on the housing so as to be spaced apart from the magnet and generating induced voltage by interaction with the first coil
Data Source
AI summary
A lens driving device is provided which includes a housing supporting a magnet; a bobbin having a first coil disposed on the outer peripheral surface thereof and moved by an interaction between the magnet and the first coil; an upper elastic member and a lower elastic member coupled to the bobbin and the housing; and a sensing coil disposed at the housing to be spaced apart from the magnet and generating an induced voltage by an interaction with the first coil, the sensing coil being wound around a side part of the housing so as to rotate in a clockwise direction or in a counterclockwise direction with reference to an optical axis.