Lens Driving Module Plastic Casing Assembly

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Solution Overview

Problem

Conventional lens driving modules face issues during assembly due to manufacturing tolerances, leading to tilted or skewed contact surfaces between the casing and base, which can result in improper operation and allow dust and particles to enter the lens unit, causing damage.

Innovation Solution

A lens driving module design featuring a base with protrusions and elastic elements, where glue is applied between the protrusions' side surfaces and the casing, ensuring secure assembly and minimizing dust entry, along with a sensing assembly for position sensing, and a plastic casing for reduced magnetic interference and miniaturization.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Manufacturing precision

If the casing is assembled to the base surface with conventional methods, then the assembly process is simple, but the contact surface becomes tilted or skewed due to manufacturing tolerances, negatively impacting proper operation

Engineering Contradiction:

Improvecontact surface alignmentVSAvoidassembly structure

Core Design Contradiction:

Manufacturing precisionVSDevice complexity

Solution Approach 1:

The base is pre-designed with protrusions that extend toward the casing before assembly. These protrusions are positioned and shaped in advance to guide the casing into proper alignment, ensuring the contact surface remains parallel to the optical lens central axis even when the casing opening is tilted or skewed during assembly.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The protrusions act as intermediary elements between the base and the casing. Instead of directly assembling the casing to the base surface, the glue is applied to the side surfaces of these protrusions, which mediate the connection and ensure proper alignment and parallelism of the contact surface.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Ease of manufacture

If additional space is provided for tool access to apply glue, then the assembly process is easier, but external dust and particles can enter the lens unit, causing damage

Engineering Contradiction:

Improveglue application accessibilityVSAvoiddust and particle contamination

Core Design Contradiction:

Ease of manufactureVSObject-affected harmful factors

Solution Approach 1:

The protrusions are strategically positioned and shaped to provide localized access points for glue application. The side surfaces of the protrusions are designed to be accessible to tools while maintaining the overall enclosed structure of the casing, allowing glue to be applied precisely where needed without creating large openings that would expose the lens unit to dust and particles.

Inventive Principle:

Principle #3Local quality

3Object-affected harmful factors

If the casing opening is reduced to prevent dust entry, then protection against contamination is improved, but access for tool application of glue becomes difficult

Engineering Contradiction:

Improvedust and particle protectionVSAvoidglue application accessibility

Core Design Contradiction:

Object-affected harmful factorsVSEase of manufacture

Solution Approach 1:

The protrusions extend in a direction perpendicular to the main casing opening, creating a three-dimensional structure that allows glue to be applied from the side. This dimensional approach enables the casing opening to remain small for dust protection while the protrusions provide side surfaces that are accessible to tools for glue application.

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

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 the structural integrity and prevents dust entry, ensuring proper operation while reducing magnetic interference and simplifying assembly, achieving improved reliability and reduced component count.

Implementation Method 1

an electromagnetic driving assembly disposed between the holder and the casing for moving the holder

Methodology Applied

Scientific EffectElectromagnetic driving: Electromagnetic Propulsion

Implementation Method 2

a first elastic element and a second elastic element, wherein the first elastic element connects the holder to the main body, and the second elastic element connects the protrusions to the holder

Methodology Applied

Scientific EffectElasticity: Elasticity

Implementation Method 3

The glue is disposed between the side surfaces and the casing

Methodology Applied

Scientific EffectAdhesion: Adhesive

Data Source

PatentUS11528394B2Lens driving module with casing having plastic material and assembly method thereof

Publication Date: 2022.12.13 ACTUTEK CORP

AI summary

An optical element driving module is provided, including a movable portion, a fixed portion, and a driving assembly. The movable portion is used for connecting an optical element. The fixed portion is movably connected to the movable portion, wherein the fixed portion includes a base and a casing. The casing is arranged with the base along a main axis, the casing includes a top wall and a side wall extended from edges of the top wall along the main axis, and the top wall includes a first surface facing the movable portion, a second surface and a third surface facing away from the first surface. The driving assembly is used for moving the movable portion relative to the fixed portion, a minimum distance between the first surface and the second surface is different from a minimum distance between the second surface and the third surface.