Camera Module Filter Seating Structure for Impact-Stable Assembly

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Solution Overview

Problem

Conventional camera modules face issues with filter and blocking member collisions due to external impacts, filter shifting or rotation, and thermosetting adhesive bursting or cracking, particularly in micro-scale modules used in small electronic devices like smartphones.

Innovation Solution

The camera module design includes a lens barrel movable in the optical-axis direction with a holder featuring a seating portion and a filter, where the spacing distances and thicknesses are strategically configured to prevent collisions and adhesive voids, using UV curable and thermosetting adhesives to secure components.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If the filter is attached to the seating portion of the holder, then the filter is secured in position, but the filter may collide with the holder due to external impacts

Engineering Contradiction:

Improvefilter positioning stabilityVSAvoidcollision damage from external impacts

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The patent designs the seating portion with a specific geometric structure where the inner side surface includes a first surface and a second surface positioned under the first surface. The spacing distance from the first surface to the filter side surface is greater than the spacing distance from the second surface to the filter side surface, creating a gradual transition zone that cushions and distributes impact forces before they reach the filter, thereby preventing collision damage while maintaining secure positioning

Inventive Principle:

Principle #11Beforehand cushioning (Prior cushioning)

2Reliability

If the filter is securely attached to the holder, then positioning stability is improved, but the filter may shift or rotate during attachment

Engineering Contradiction:

Improvefilter positioning stabilityVSAvoidfilter alignment accuracy

Core Design Contradiction:

ReliabilityVSManufacturing precision

Solution Approach 1:

The patent applies different spacing distances at different locations of the seating portion. The inner side surface has a first surface with a larger spacing distance and a second surface with a smaller spacing distance. This localized variation in spacing creates optimal attachment conditions at each position, preventing shifting and rotation during the attachment process while ensuring stable positioning once attached

Inventive Principle:

Principle #3Local quality

3Strength

If thermosetting adhesive is used to attach components, then strong bonding is achieved, but voids form during curing causing bursting or cracking

Engineering Contradiction:

Improveadhesive bonding strengthVSAvoidadhesive integrity

Core Design Contradiction:

StrengthVSReliability

Solution Approach 1:

The patent carefully controls the spacing distances between surfaces in the seating portion configuration. By optimizing the spacing distance from the first surface to the filter side surface versus the spacing distance from the second surface to the filter side surface, the design ensures proper adhesive distribution and curing without trapped voids, preventing bursting or cracking while maintaining strong bonding

Inventive Principle:

Principle #35Parameter changes

4Use of energy by moving object

If the camera module is designed for micro-scale applications, then power consumption is reduced, but the components become more susceptible to external impacts

Engineering Contradiction:

Improvepower consumptionVSAvoidimpact susceptibility

Core Design Contradiction:

Use of energy by moving objectVSObject-affected harmful factors

Solution Approach 1:

The patent incorporates a cushioning structure in the seating portion where the inner side surface transitions from a first surface with larger spacing to a second surface with smaller spacing. This gradual transition zone acts as a shock absorber that distributes and mitigates impact forces before they reach the filter, protecting the micro-scale camera module components from damage while maintaining the compact design

Inventive Principle:

Principle #11Beforehand cushioning (Prior cushioning)

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 effectively suppresses filter collisions and adhesive cracking, reducing the time required for assembly and enhancing the durability of the camera module.

Implementation Method 1

using UV curable and thermosetting adhesives to secure components

Methodology Applied

Scientific EffectPhotopolymerisation: Photopolymerisation

Data Source

PatentUS20250341755A1Camera module and optical device comprising same

Publication Date: 2025.11.06 LG INNOTEK CO LTD

AI summary

A camera module includes a lens barrel configured to be movable in an optical-axis direction, a holder disposed under the lens barrel and including a seating portion recessed from an upper surface thereof, a filter disposed on a bottom surface of the seating portion of the holder, a blocking member disposed on an upper surface of the filter, and an image sensor disposed under the filter, wherein the seating portion may include an inner side surface facing a side surface of the filter and the inner side surface of the seating portion may include a first surface and a second surface positioned under the first surface, and wherein a spacing distance from the first surface to an outer side surface of the blocking member may be greater than a spacing distance from the second surface to the side surface of the filter.