Optical Waveguide Manufacturing via Frame-Shaped Irradiation

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Solution Overview

Problem

The manufacturing of optical waveguides is hindered by deformation such as warpage in the core layer, which increases with the size of non-irradiated regions, affecting the lamination and removal steps, thus requiring a method to suppress warpage and enhance manufacturing efficiency.

Innovation Solution

A manufacturing method involving a pre-exposure laminate with a core forming layer irradiated by active radiation, creating a post-exposure laminate with a core layer and side cladding portions, where the irradiated region forms a frame shape and occupies 20% or more of the core forming layer's area, and subsequent lamination and cutting steps to produce an optical waveguide.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Manufacturing precision

If the core forming layer is irradiated with active radiation to form a core layer, then the optical waveguide structure is created, but warpage and deformation occur in the post-exposure laminate

Engineering Contradiction:

Improvestructural integrityVSAvoidwarpage

Core Design Contradiction:

Manufacturing precisionVSShape

Solution Approach 1:

The irradiated region is segmented into a frame-shaped pattern rather than uniform irradiation, dividing the core forming layer into irradiated and non-irradiated portions that balance each other's deformation effects

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Different regions of the core forming layer are given different properties: the frame-shaped irradiated regions provide structural support to prevent warpage, while the non-irradiated regions maintain optical functionality, creating local quality differences that solve the contradiction

Inventive Principle:

Principle #3Local quality

2Productivity

If the area of irradiated region is increased to suppress warpage, then manufacturing efficiency improves, but the core portion area decreases

Engineering Contradiction:

Improvemanufacturing efficiencyVSAvoidcore portion area

Core Design Contradiction:

ProductivityVSArea of moving object

Solution Approach 1:

Instead of irradiating the entire core forming layer (excessive action), only frame-shaped regions are irradiated (partial action), which is sufficient to prevent warpage while preserving the core portion area for optical functionality

Inventive Principle:

Principle #16Partial or excessive action

Solution Approach 2:

The irradiation pattern parameter is changed from uniform coverage to frame-shaped distribution, and the irradiated area is optimized to be 20% or more of the total area, achieving the minimum threshold for warpage suppression while maximizing core portion retention

Inventive Principle:

Principle #35Parameter changes

3Ease of manufacture

If the core layer is laminated with cladding layers, then the optical waveguide structure is completed, but the warpage hinders the lamination process

Engineering Contradiction:

Improvelamination processVSAvoiddeformation

Core Design Contradiction:

Ease of manufactureVSShape

Solution Approach 1:

The frame-shaped irradiation is applied in advance to the core forming layer to create internal stress distribution that counteracts the warpage forces that would otherwise occur during subsequent lamination and substrate removal processes, preventing deformation before it happens

Inventive Principle:

Principle #9Preliminary anti-action

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 method effectively suppresses warpage in the post-exposure laminate, improving the manufacturing efficiency of optical waveguides by maintaining structural integrity and reducing deformation.

Implementation Method 1

a step of irradiating the core forming layer with active radiation to obtain a post-exposure laminate which has a core layer including a core portion corresponding to a non-irradiated region with the active radiation and a side cladding portion corresponding to an irradiated region with the active radiation

Methodology Applied

Scientific EffectPhotopolymerisation: Photopolymerisation

Implementation Method 2

the core forming layer contains a polymer and a monomer, and the monomer moves by the irradiation with active radiation to cause a difference in refractive index between the irradiated region and the non-irradiated region

Methodology Applied

Scientific EffectDiffusion: Diffusion

Data Source

PatentUS20250004174A1Manufacturing method of optical waveguide

Publication Date: 2025.01.02 SUMITOMO BAKELITE CO LTD

AI summary

The manufacturing method of an optical waveguide of the present invention includes a step of preparing a pre-exposure laminate including a substrate and a core forming layer laminated on the substrate, a step of irradiating the core forming layer with active radiation to obtain a post-exposure laminate which has a core layer including a core portion corresponding to a non-irradiated region with the active radiation and a side cladding portion corresponding to an irradiated region with the active radiation, and has the substrate supporting the core layer, a step of laminating a cladding layer on the core layer included in the post-exposure laminate to obtain a workpiece, and a step of cutting out an optical waveguide from the workpiece, in which the irradiated region includes a frame-shaped part extending along an outer edge of the core forming layer and having a frame shape, and an area of the irradiated region is 20% or more of an entire area of the core forming layer.