Imaging Lens Assembly Light Absorbing Layer Stray Light Control

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Solution Overview

Problem

Existing imaging lens assembly modules for portable electronic devices face challenges in reducing stray light reflection and enhancing mechanical strength while maintaining high optical quality.

Innovation Solution

The proposed imaging lens assembly module incorporates a plastic optical lens element with a light blocking sheet and a light absorbing layer. The light blocking sheet is spaced apart from the optical lens element and features a through hole surrounded by a concave-curved ring formed by the light absorbing layer, which is used to fix the light blocking sheet and absorb stray light.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If a light blocking sheet is added to reduce stray light reflection, then optical quality is improved, but device complexity increases

Engineering Contradiction:

Improveoptical qualityVSAvoiddevice complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The light blocking sheet is designed to perform multiple functions simultaneously: blocking stray light, providing mechanical support, and serving as a mounting surface for the optical lens element. This multi-functionality reduces the need for additional separate components, thereby improving optical quality without proportionally increasing device complexity

Inventive Principle:

Principle #6Universality (Multi-functionality)

Solution Approach 2:

The optical lens element is positioned within the aperture defined by the light blocking sheet, creating a nested configuration where the lens is housed by the light blocking structure. This nesting arrangement allows the light blocking sheet to enclose and protect the optical element while maintaining a compact overall structure

Inventive Principle:

Principle #7Nested doll (Nesting)

2Reliability

If the light blocking sheet is closely positioned to the optical lens element, then stray light blocking is improved, but mechanical strength is reduced due to potential damage during assembly

Engineering Contradiction:

Improvestray light blockingVSAvoidmechanical strength

Core Design Contradiction:

ReliabilityVSStrength

Solution Approach 1:

The light blocking sheet is segmented with a through hole that separates the blocking function from the mounting function. The through hole allows the optical lens element to be positioned and secured independently, providing mechanical protection during assembly while maintaining effective stray light blocking through the surrounding light blocking material

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The light absorbing layer acts as an intermediary between the light blocking sheet and the optical lens element. This intermediary layer provides cushioning and protection during assembly, preventing direct contact that could cause damage, while still maintaining the light blocking function through the surrounding light blocking sheet

Inventive Principle:

Principle #24Intermediary (Mediator)

3Reliability

If additional optical lens elements are added to improve optical quality, then imaging performance is improved, but device complexity and manufacturing difficulty increase

Engineering Contradiction:

Improveimaging performanceVSAvoidease of manufacture

Core Design Contradiction:

ReliabilityVSEase of manufacture

Solution Approach 1:

The patent extracts the light blocking function from the optical path by using a dedicated light blocking sheet with a through hole. This separation allows the optical lens element to be simpler in design (without additional lens elements) while still achieving good imaging performance through the effective light blocking arrangement

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

Instead of adding more optical lens elements to improve imaging performance, the patent inverts the approach by using a light blocking sheet to control stray light and improve optical quality. This inversion simplifies the optical path while maintaining or improving imaging performance through better stray light management

Inventive Principle:

Principle #13The other way round (Inversion)

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 configuration effectively reduces stray light reflection, enhances the mechanical strength of the imaging lens assembly module, and improves the optical quality by maintaining a precise structure and preventing damage during assembly.

Implementation Method 1

a light absorbing layer... for absorbing the stray light

Methodology Applied

Scientific EffectLight absorption: Absorption (EM radiation)

Data Source

PatentUS12313898B2Imaging lens assembly module, camera module and electronic device

Publication Date: 2025.05.27 LARGAN PRECISION

AI summary

An imaging lens assembly module has an optical axis, and includes an optical element set, a light blocking element assembling surface, and a light absorbing layer. The optical element set includes an optical lens element and a light blocking sheet. The optical lens element is a plastic lens element, and includes an optical effective portion and an outer peripheral portion. The light blocking sheet is disposed on the outer peripheral portion, and spaced apart from the outer peripheral portion. The light blocking sheet includes an object-side surface, an image-side surface and an inner opening surface. The inner opening surface surrounds a through hole of the light blocking sheet. The light blocking sheet is disposed on the light blocking element assembling surface. The light absorbing layer is disposed on the image-side surface and for fixing the light blocking sheet on the light blocking element assembling surface.