Fluorescent Toner Set Hue Angle Optimization

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Solution Overview

Problem

Existing toner sets struggle to produce images with excellent graininess and gray tone, particularly when using cyan, magenta, yellow, and black toners in combination with fluorescent toners T A and T B, where the difference in hue angles between the fluorescent toners is less than 135 degrees.

Innovation Solution

A toner set comprising a cyan toner, a magenta toner, a yellow toner, a black toner, a fluorescent toner T A with a hue angle of 125 degrees or more and 165 degrees or less, and a fluorescent toner T B with a hue angle of -25 degrees or more and 15 degrees or less, where the difference between the hue angles of the fluorescent toners is 135 degrees or more.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If fluorescent toners T A and T B with a small difference in hue angles (less than 135 degrees) are used, then the color gamut is expanded, but the graininess and gray tone of the image deteriorate

Engineering Contradiction:

Improvecolor gamutVSAvoidgraininess and gray tone

Core Design Contradiction:

Adaptability or versatilityVSManufacturing precision

Solution Approach 1:

The patent applies parameter changes by adjusting the hue angle difference between fluorescent toners T A and T B to be 135 degrees or more. This specific parameter threshold resolves the contradiction by finding the optimal balance point where color gamut expansion is maintained while image quality (graininess and gray tone) is preserved or improved.

Inventive Principle:

Principle #35Parameter changes

2Manufacturing precision

If the difference in hue angles between fluorescent toners T A and T B is increased to 135 degrees or more, then the graininess and gray tone are improved, but the color gamut may be reduced

Engineering Contradiction:

Improvegraininess and gray toneVSAvoidcolor gamut

Core Design Contradiction:

Manufacturing precisionVSAdaptability or versatility

Solution Approach 1:

The patent optimizes the hue angle difference parameter to be 135 degrees or more, which resolves the contradiction by identifying the threshold where image quality improvement is achieved while maintaining acceptable color gamut. This parameter optimization balances the two competing requirements.

Inventive Principle:

Principle #35Parameter changes

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

The proposed toner set enables the formation of images with improved graininess and gray tone, as the larger difference in hue angles between the fluorescent toners T A and T B enhances the simulation of light colors and achromatic regions, reducing graininess and improving color reproduction.

Implementation Method 1

a fluorescent toner T A having a hue angle of 125 degrees or more and 165 degrees or less, and a fluorescent toner T B having a hue angle of -25 degrees or more and 15 degrees or less

Methodology Applied

Scientific EffectFluorescence: Fluorescence

Data Source

PatentEP4495695A1Toner set, electrostatic image developer set, toner cartridge set, process cartridge, image forming apparatus, image forming method, and printed material

Publication Date: 2025.01.22 FUJIFILM BUSINESS INNOVATION CORP

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AI summary

A toner set includes cyan, magenta, yellow, and black toners, a fluorescent toner TA having a hue angle of 125 degrees or more and 165 degrees or less, and a fluorescent toner TB having a hue angle of -25 degrees or more and 15 degrees or less, wherein a difference between the hue angles of the fluorescent toners TA and TB is 135 degrees or more.