Lens Driving Structure With Flexible Terminal Support Against Disconnection

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Solution Overview

Problem

Existing voice coil motors in camera modules are difficult to apply to miniature low-power devices and are prone to electrical disconnection due to shocks and shaking, especially in small electronic products like smartphones.

Innovation Solution

A lens moving apparatus with a housing, bobbin, coil, magnet, elastic members, circuit board, and terminals, featuring a specific pad and coupler configuration to improve soldering and prevent electrical disconnection, including a groove and through via design on the circuit board for enhanced connectivity.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If a voice coil motor is used in a camera module, then the lens can be moved for focusing and stabilization, but the device becomes difficult to apply to miniature low-power camera modules and prone to electrical disconnection due to shocks and shaking

Engineering Contradiction:

Improveelectrical connection stabilityVSAvoidmotor structure complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent replaces the traditional voice coil motor structure with a simplified electromagnetic driving structure consisting of a coil, magnet, and elastic member. This substitution reduces mechanical complexity while maintaining the lens moving function, making it suitable for miniature low-power camera modules. The elastic member provides both mechanical support and electrical connection, eliminating the need for separate rigid connectors that are prone to disconnection under shock and vibration.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The patent employs an elastic member that functions as both a mechanical support structure and an electrical connection element. This flexible component can withstand shocks and shaking while maintaining electrical connectivity, solving the reliability issue of electrical disconnection in miniature camera modules subjected to vibration and impact.

Inventive Principle:

Principle #30Flexible shells and thin films

2Reliability

If traditional terminal connections are used on the circuit board, then the structure is simple, but electrical disconnection occurs due to shocks and shaking in small electronic products

Engineering Contradiction:

Improveterminal connection stabilityVSAvoidsoldering difficulty

Core Design Contradiction:

ReliabilityVSEase of manufacture

Solution Approach 1:

The patent merges the electrical connection function with the mechanical support function by integrating the terminal structure directly into the circuit board with through vias. The terminal includes a coupler that couples to the elastic member and connects to pads on the circuit board, creating a unified structure that provides both mechanical support and electrical connectivity, preventing disconnection under shock and vibration while maintaining manufacturing feasibility.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The patent utilizes the vertical dimension by implementing through vias that extend through the circuit board, allowing electrical connections to be established from both the upper and lower surfaces. This three-dimensional connection approach enhances connection stability against shocks and shaking while providing multiple soldering access points that facilitate ease of manufacture.

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

3Volume of moving object

If the circuit board is made compact for miniature camera modules, then the device size is reduced, but soldering becomes more difficult and electrical disconnection risk increases

Engineering Contradiction:

Improvecamera module sizeVSAvoidsoldering accessibility

Core Design Contradiction:

Volume of moving objectVSEase of manufacture

Solution Approach 1:

The patent segments the terminal structure into distinct components: a coupler portion that interfaces with the elastic member, a connector portion that provides electrical connection, and integration with through vias in the circuit board. This segmentation allows each component to be optimized for its specific function while maintaining compact overall dimensions, enabling accessible soldering points without increasing the camera module volume.

Inventive Principle:

Principle #1Segmentation

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

Enhances ease of soldering and prevents electrical disconnection of terminals, ensuring stable operation in miniature camera modules despite shocks and shaking.

Implementation Method 1

a first coil disposed at the bobbin, a magnet disposed at the housing

Methodology Applied

Scientific EffectElectromagnetic force: Lorentz Force

Implementation Method 2

an elastic member coupled both to the bobbin and to the housing

Methodology Applied

Scientific EffectElasticity: Elasticity

Data Source

PatentUS12523841B2Lens driving device, and camera module and optical device including same

Publication Date: 2026.01.13 LG INNOTEK CO LTD

AI summary

A lens moving apparatus including a housing; a bobbin disposed in the housing; a magnet disposed on the housing; a first coil disposed on the bobbin; an upper elastic member coupled to an upper portion of the bobbin and to an upper portion of the housing; a base disposed under the housing; a terminal disposed on the base; a circuit member disposed on the base and comprising a pad portion; and a support connecting the upper elastic member and the terminal.