Optical Coupling Element Dye Concentration Shielding

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Solution Overview

Problem

Existing optical coupling elements face challenges in improving the shielding property for incoming light without decreasing the transmission efficiency of signal light, particularly when dyes are added to the light transparent resin, leading to crystallization issues.

Innovation Solution

Incorporating a dye that absorbs light with a shorter wavelength than the light emitting element's wavelength range in a concentration of 0.7% by weight or less into the light transparent resin, which is made of silicone, to enhance shielding properties without compromising signal light transmission.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Object-affected harmful factors

If a dye is added to the light transparent resin to improve shielding property for incoming light, then the S/N ratio of the light receiving element is improved, but the transmission efficiency of signal light is decreased due to crystallization of the dye

Engineering Contradiction:

Improveshielding property for incoming lightVSAvoidtransmission efficiency of signal light

Core Design Contradiction:

Object-affected harmful factorsVSReliability

Solution Approach 1:

The patent applies parameter changes by precisely controlling the concentration of dye in the light transparent resin to 0.7% by weight or less. This specific concentration parameter prevents dye crystallization while maintaining adequate shielding property, thereby resolving the contradiction between improving shielding and maintaining signal light transmission efficiency

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent uses a composite material system consisting of silicone resin as the base light transparent resin combined with a controlled amount of dye. This composite structure allows the resin to maintain its transparency and signal transmission properties while the dye provides shielding against incoming light, without causing crystallization issues

Inventive Principle:

Principle #40Composite materials

2Volume of moving object

If the thickness of the outer covering light reflection resin is reduced to make the optical coupling element smaller and thinner, then the device size is reduced, but the shielding property for incoming light becomes insufficient

Engineering Contradiction:

Improveoptical coupling element sizeVSAvoidshielding property for incoming light

Core Design Contradiction:

Volume of moving objectVSObject-affected harmful factors

Solution Approach 1:

The patent changes the parameter of dye concentration in the light transparent resin to 0.7% by weight or less, which provides effective shielding against incoming light. This allows the outer covering light reflection resin to be made thinner without compromising shielding performance, thus enabling smaller and thinner optical coupling elements

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The dye in the light transparent resin acts as an intermediary shielding layer that provides additional protection against incoming light. This intermediary shielding mechanism compensates for the reduced thickness of the outer covering light reflection resin, allowing the overall device to be more compact while maintaining adequate shielding property

Inventive Principle:

Principle #24Intermediary (Mediator)

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 approach effectively improves the shielding of incoming light while maintaining high transmission efficiency of signal light, thereby enhancing the signal-to-noise ratio of the light receiving element without the adverse effects of dye crystallization.

Implementation Method 1

a dye which absorbs light having a shorter wavelength than a predetermined wavelength range including a light emitting wavelength of the light emitting element is added in a concentration of 0.7% by weight or less to the light transparent resin

Methodology Applied

Scientific EffectLight absorption: Absorption (EM radiation)

Implementation Method 2

transmits signal light emitted from the light emitting element to the light receiving element

Methodology Applied

Scientific EffectLight transmission:

Implementation Method 3

by the light reflection resin to which the reflective material is added, not only can light emitted from the light emitting element be effectively trapped in the light transparent resin, but also incoming light coming from a fluorescent lamp or the sun can be reflected

Methodology Applied

Scientific EffectLight reflection: Reflection

Data Source

PatentUS8729512B2Optical coupling element and method for manufacturing the same

Publication Date: 2014.05.20 RENESAS ELECTRONICS CORP

AI summary

An optical coupling element includes a light emitting element and a light receiving element which receives emitted light from the light emitting element. The optical coupling element contains a silicone resin and includes a light transparent resin which covers the light emitting element and the light receiving element and transmits the signal light emitted from the light emitting element to the light receiving element (for example, a specific light transparent gel resin) and a light reflection resin which covers a circumference of the light transparent resin. To the light transparent resin, a dye which absorbs light having a shorter wavelength than a predetermined wavelength range including a light emitting wavelength of the light emitting element is added in a concentration of 0.7% by weight or less.