Light Filtering Assembly Bonding via Adhesive Injection

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Solution Overview

Problem

Conventional light filtering assemblies in lens modules face issues with inferior adhesive strength due to glue deterioration, non-homogeneous coating, and incomplete solidification, leading to peeling and reduced production yield, and the integration of the spacer with the light filter through injection molding can cause cracking and deformation, affecting imaging quality.

Innovation Solution

A light filtering assembly comprising a fixed mount, a light filter, a shutter, and a binding element, where an adhesive material is injected into a binding space to form a binding element that securely fixes the light filter and shutter to the fixed mount, preventing peeling and deformation, and an auxiliary binding element ensures stable positioning of the light filter.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of manufacture

If spot gluing method is used to attach light filter to spacer, then assembling process is simple, but adhesive strength is inferior due to glue deterioration and non-homogeneous coating

Engineering Contradiction:

Improveassembling process simplicityVSAvoidadhesive strength

Core Design Contradiction:

Ease of manufactureVSReliability

Solution Approach 1:

The light filter and spacer are merged into a single integral component through injection molding, eliminating the need for separate attachment processes. This combines two previously separate parts (light filter and spacer) into one unified structure, resolving the contradiction by removing the adhesive interface that caused reliability issues while maintaining manufacturing simplicity through a single molding operation.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

A support part is introduced as an intermediary component between the light filter and the fixed mount. The support part provides a dedicated attachment interface that distributes bonding forces evenly, preventing the adhesive defects seen in direct spot gluing applications. This intermediary structure enables reliable attachment while maintaining process simplicity.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Productivity

If light filter is formed integrally with spacer through injection molding, then spot gluing procedure is eliminated and production yield improves, but light filter cracks easily due to clamping force and spacer deforms during cooling

Engineering Contradiction:

Improveproduction yieldVSAvoidlight filter integrity and spacer dimensional stability

Core Design Contradiction:

ProductivityVSManufacturing precision

Solution Approach 1:

The integral structure is segmented into functionally distinct regions: a support part with increased thickness dedicated to attachment functions, and a standard-thickness region for optical functions. This segmentation allows the support part to absorb molding stresses and prevent cracking in the light filter while maintaining the dimensional stability needed for precise spacer positioning during cooling.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The support part is designed with locally increased thickness compared to the rest of the light filter structure. This local quality change concentrates structural reinforcement exactly where attachment forces are applied, preventing cracking at the attachment interface while maintaining the overall thin-profile design needed for optical performance and preventing deformation during cooling.

Inventive Principle:

Principle #3Local quality

3Reliability

If conventional spot gluing method is used, then labor cost is higher due to inferior adhesive power requiring rework, but at least peeling failure is avoided through better bonding

Engineering Contradiction:

Improvebonding reliabilityVSAvoidassembling efficiency

Core Design Contradiction:

ReliabilityVSProductivity

Solution Approach 1:

Inventive Principle:

Principle #5Merging (Combining)

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 solution enhances assembling efficiency and reduces labor costs by forming the light filtering assembly integrally, preventing peeling and deformation, and ensuring high production yield and good imaging quality.

Implementation Method 1

An adhesive material is injected into the first binding space and then cooled down to form the binding element in the first binding space, so as to stop the light filter and the shutter at the hollow part as well as fix the light filter and the shutter on the fixed mount

Methodology Applied

Scientific EffectAdhesive: Adhesive

Data Source

PatentEP3705925B1Light filtering assembly used in a lens module

Publication Date: 2023.07.26 DRAGONSTATE TECH CO LTD

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AI summary

A light filtering assembly is installed in a lens module, including a fixed mount having a hollow part, a light filter at the hollow part, a shutter annularly disposed on the light filter, and a binding element. The hollow part is annularly formed by a support part extending from the fixed mount toward the hollow part. A first binding space is formed between the support part and the fixed mount, extending the outer periphery of the light filter and the shutter into the first binding space. An adhesive material is injected into the first binding space, and is then cooled down to form the binding element in the first binding space, so as to stop the light filter and the shutter at the hollow part as well as fix the light filter and the shutter on the fixed mount.