Optical Module Housing Stray Light Reduction
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Solution Overview
Problem
High-output laser modules face issues with stray light generation due to metal surfaces and white materials within the housing, which reduces the accuracy of photodiode monitoring and requires additional components for absorption or scattering, increasing costs and complexity.
Innovation Solution
The implementation of a reduced optical reflection area with a rough surface inside the housing, processed to absorb and scatter stray light, utilizing laser beam surface treatment to enhance optical absorption and reduce reflectivity, eliminating the need for additional components and coatings.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If additional components or coatings are added to absorb or scatter stray light, then stray light reduction effectiveness is improved, but device complexity and manufacturing cost increase
Solution Approach 1:
The patent extracts the stray light absorption function from separate components and integrates it directly into the housing surface through a reduced optical reflection area. This eliminates the need for additional absorption components while maintaining effective stray light reduction.
Solution Approach 2:
The patent combines the housing structure with the light absorption function by creating a reduced optical reflection area directly on the housing surface. This merging of structural and functional elements reduces device complexity while maintaining stray light reduction effectiveness.
2Object-affected harmful factors
If additional components or coatings are added to absorb or scatter stray light, then stray light reduction effectiveness is improved, but manufacturing cost increases
Solution Approach 1:
The patent extracts the light absorption function from separate purchasable components and integrates it into the housing manufacturing process itself. This eliminates the need to purchase and install additional absorption components, reducing manufacturing cost.
Solution Approach 2:
The housing structure serves dual purposes: providing mechanical support and absorbing stray light through the reduced optical reflection area. This multi-functionality eliminates the need for separate light absorption components, reducing manufacturing cost.
3Ease of operation
If a photodiode monitors laser beam intensity for operation control, then operation control accuracy is improved, but monitoring accuracy decreases when the photodiode receives stray light as noise
Solution Approach 1:
The patent converts the harmful stray light into a beneficial effect by using the reduced optical reflection area to absorb and scatter stray light before it reaches the photodiode. This protects the photodiode from noise while maintaining its operation control capability.
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
Effectively reduces stray light intensity by absorbing and scattering it within the housing, improving monitoring accuracy and maintaining manufacturing yield without additional costs or defects.
Implementation Method 1
a partial area of a surface inside the housing serves as a reduced optical reflection area processed so as to absorb the light
Implementation Method 2
have a rough surface
Data Source
AI summary
An optical module includes a housing and an optical element that is disposed in the housing and emits light in the housing, in which a partial area of a surface inside the housing serves as a reduced optical reflection area processed so as to absorb the light and have a rough surface.