Lens Moving Module Assembly for Precise Autofocus Alignment

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Solution Overview

Problem

Existing lens moving apparatuses face challenges in preventing deformation or damage during assembly, which can affect the precision and reliability of camera modules in portable devices.

Innovation Solution

The proposed lens moving apparatus includes a cover member, a housing, a bobbin with a screw thread, a first coil, a magnet, elastic members, and a circuit member with a second coil, designed to move in a specific direction for auto-focusing while being supported by elastic members and protected by a cover member.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Volume of moving object

If the lens moving apparatus uses a compact design with integrated components, then the device size is reduced for portable applications, but the risk of part deformation or damage during assembly increases

Engineering Contradiction:

Improvedevice sizeVSAvoidassembly reliability

Core Design Contradiction:

Volume of moving objectVSReliability

Solution Approach 1:

The lens moving apparatus is divided into distinct modular components including a drive assembly (with bobbin and coil), a lens assembly, a support assembly, and a housing. Each module can be manufactured and tested separately, then assembled together, reducing the risk of deformation while maintaining compact overall dimensions suitable for portable devices

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent implements preliminary positioning features such as protrusions and recesses on the bobbin, pre-assembled support members, and guide structures in the housing that ensure correct component alignment before final assembly. This preliminary action prevents misalignment and deformation during the assembly process while maintaining the compact design

Inventive Principle:

Principle #10Preliminary action

2Device complexity

If the lens moving apparatus integrates multiple functions (auto-focusing and optical image stabilization) in a single compact structure, then the device complexity is reduced, but the manufacturing precision requirements increase

Engineering Contradiction:

Improvestructural complexityVSAvoidassembly precision

Core Design Contradiction:

Device complexityVSManufacturing precision

Solution Approach 1:

The lens moving apparatus is designed as a multi-functional unit where the same compact housing and support structure serve both auto-focusing (moving lens along optical axis) and optical image stabilization (correcting lateral lens displacement) functions. This universal design reduces overall structural complexity while implementing precision-guided movement paths for both functions through integrated guide rails and magnetic field control

Inventive Principle:

Principle #6Universality (Multi-functionality)

3Strength

If the bobbin is designed with screw threads for secure mounting, then the mechanical strength is improved, but the manufacturing complexity and potential for assembly damage increase

Engineering Contradiction:

Improvemechanical strengthVSAvoidmanufacturing ease

Core Design Contradiction:

StrengthVSEase of manufacture

Solution Approach 1:

The patent replaces traditional mechanical screw-threaded fastening with a magnetic coupling system where the bobbin contains magnetic elements that interact with corresponding magnets in the housing. This substitution eliminates the need for screw threads and complex mechanical assembly operations, reducing manufacturing complexity and assembly damage risk while maintaining secure mounting and mechanical strength through magnetic holding force

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

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

This design enhances the assembly process by preventing deformation and damage, ensuring precise movement for auto-focusing, and maintaining the structural integrity of the lens moving apparatus.

Implementation Method 1

a first coil provided on an outer circumferential surface of the bobbin, a first magnet coupled to the housing so as to be opposite the first coil

Methodology Applied

Scientific EffectElectromagnetic induction: Electromagnetic Induction

Data Source

PatentUS12235516B2Lens moving apparatus, and camera module and portable device including the same

Publication Date: 2025.02.25 LG INNOTEK CO LTD

AI summary

A lens moving apparatus is disclosed. The lens moving apparatus includes a cover member, a housing disposed in the cover member, a bobbin disposed in the housing, the bobbin being provided in an inner circumferential surface thereof with a screw thread, the bobbin being configured to move in a first direction, which is parallel to an optical-axis direction, a first coil provided on an outer circumferential surface of the bobbin, a first magnet coupled to the housing so as to be opposite the first coil, an upper elastic member provided at an upper surface of the bobbin, the upper elastic member being coupled to the bobbin and the housing, a lower elastic member provided at a lower surface of the bobbin, the lower elastic member being coupled to the bobbin and the housing, a circuit member comprising a second coil disposed under the housing so as to be opposite the first magnet, a circuit board disposed at a lower side of the circuit member, the circuit board being connected to the circuit member, a plurality of support members connected to the upper elastic member, and a base disposed under the circuit board, the base being coupled to the cover member.