Spectacle Lens Polarizing Layer Spin Coating

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Solution Overview

Problem

Existing spectacle lenses face a trade-off between high luminous transmittance and polarizing function, where increasing the degree of polarization often results in reduced luminous transmittance, failing to meet the demand for a lens with both high luminous transmittance and effective glare reduction.

Innovation Solution

A method for manufacturing a spectacle lens involving the formation of a polarizing layer by applying a coating liquid containing 0.04% to 1.5% dichroic pigment by spin coating at speeds of 200 rpm to 600 rpm on a rubbing-treated surface, which enhances both luminous transmittance and polarizing function.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If the degree of polarization is increased to reduce glare, then the polarizing function is improved, but the luminous transmittance is reduced

Engineering Contradiction:

Improvepolarizing functionVSAvoidluminous transmittance

Core Design Contradiction:

ReliabilityVSIllumination intensity

Solution Approach 1:

The patent applies parameter changes by precisely controlling the concentration of dichroic pigment within 0.04% to 1.5% and spin coating speed within 200 rpm to 600 rpm. These parameter optimizations enable the polarizing layer to achieve high polarizing function while maintaining high luminous transmittance, resolving the trade-off between glare reduction and light transmission

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent uses composite materials by combining dichroic pigment with specific solvents and additives to create a coating liquid formulation. This composite approach allows the polarizing layer to achieve both high polarization degree and high luminous transmittance simultaneously, overcoming the limitations of conventional single-material approaches

Inventive Principle:

Principle #40Composite materials

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 enables the production of spectacle lenses with high luminous transmittance while maintaining a high degree of polarization, effectively reducing glare without compromising luminous transmittance, thereby addressing the trade-off limitations of existing technologies.

Implementation Method 1

coating liquid containing 0.04% by mass to 1.5% by mass of a dichroic pigment

Methodology Applied

Scientific EffectDichroism: Dichroic Filter

Implementation Method 2

applying a coating liquid containing 0.04% by mass to 1.5% by mass of a dichroic pigment by a spin coating method at a speed of 200 rpm to 600 rpm

Methodology Applied

Scientific EffectCentrifugal force: Centrifugal Force

Data Source

PatentUS10913226B2Method for manufacturing spectacle lens

Publication Date: 2021.02.09 HOYA LENS THAILAND LTD

AI summary

Provided is a spectacle lens endowed with high luminous transmittance as well as adequate polarizing function. A method for manufacturing a spectacle lens, comprising forming a polarizing layer by applying a coating liquid containing 0.04% by mass to 1.5% by mass of a dichroic pigment by a spin coating method at a speed of 200 rpm to 600 rpm on a rubbing-treated surface.