Lens Drive Terminal Layout for Stable Soldered Connections
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Solution Overview
Problem
Existing lens moving apparatuses in miniature camera modules face challenges in ease of soldering circuit boards to terminals and are prone to electrical disconnection, particularly in small electronic devices like smartphones that experience frequent shocks and shaking.
Innovation Solution
A lens moving apparatus with a bobbin, first coil, magnets, and elastic members, where the first coil is connected to the circuit board through soldered connections with elastic members, ensuring stable electrical contact and preventing disconnection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If terminals are connected to the circuit board in existing lens moving apparatuses, then electrical connection is established, but the soldering process becomes difficult and electrical disconnection occurs frequently
Solution Approach 1:
The terminal is divided into two separate connectors: a first connector that protrudes upward from the circuit board, and a second connector that protrudes downward. This segmentation allows the upward-facing first connector to be easily soldered to the circuit board while the downward-facing second connector connects to the lens module, resolving the contradiction between soldering ease and connection stability.
Solution Approach 2:
The terminal structure transitions from a conventional planar connection to a three-dimensional configuration with connectors extending in opposite directions (upward and downward). This dimensional change enables the first connector to be optimally positioned for soldering access from above, while the second connector maintains stable electrical connection to the lens module, simultaneously improving both soldering ease and connection reliability.
2Volume of moving object
If the camera module is miniaturized for small electronic products, then device size is reduced, but terminals become prone to electrical disconnection due to shocks and shaking
Solution Approach 1:
By segmenting the terminal into upward and downward connectors, the design isolates the soldering connection (first connector) from the mechanical stress of miniaturization. The downward second connector maintains stable connection to the lens module without being compromised by the reduced overall size, allowing miniaturization while preserving connection reliability.
Solution Approach 2:
The first connector acts as an intermediary element that facilitates reliable electrical connection between the circuit board and the terminal structure. Its upward protrusion design provides a stable intermediate connection point that resists disconnection under shocks and shaking, enabling the camera module to be miniaturized without sacrificing terminal reliability.
3Ease of operation
If the first connector is disposed above the second connector, then electrical connection is established, but accessibility for soldering is limited in miniaturized devices
Solution Approach 1:
The terminal structure utilizes vertical dimensionality with the first connector extending upward and the second connector extending downward. This three-dimensional arrangement maximizes soldering accessibility from the top surface while maintaining compact overall device size, as the connectors are stacked vertically rather than requiring lateral space.
Solution Approach 2:
Segmenting the terminal into vertically separated connectors allows the first connector to be optimally positioned for soldering access from above, independent of the second connector's position. This segmentation enables excellent soldering accessibility in miniaturized devices without increasing the horizontal footprint or overall device volume.
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
Improves the ease of soldering and prevents electrical disconnection of terminals, enhancing the stability and reliability of the lens moving apparatus in small electronic devices.
Implementation Method 1
a first coil disposed on the bobbin; a magnet which is disposed on the housing and faces the first coil
Implementation Method 2
a circuit member including a second coil facing the magnet
Implementation Method 3
an upper elastic member disposed on an upper portion of the bobbin and coupled to the bobbin and the housing
Data Source
Figure 1
Figure 2~3
Figure 4
AI summary
An embodiment comprises: a housing; a bobbin disposed in the housing; a first coil disposed on the bobbin; a magnet disposed at the housing; an elastic part coupled to the bobbin and the housing; a circuit board disposed under the housing and comprising a pad part; a base disposed under the circuit board; a terminal disposed on the base; and a support part, one end of which is coupled to the elastic part and the other end of which is coupled to the terminal, wherein the pad part comprises: a first pad disposed beneath the circuit board; a second pad on the circuit board; and a third pad connecting the first pad and the second pad.