Electrophotography Toner Set for Intermediate Color Reproduction
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Solution Overview
Problem
Conventional electrophotographic toner sets struggle to achieve broad color reproduction, particularly in the intermediate color region (red), especially in low to high lightness ranges, due to limitations in the color gamut provided by the standard four-color toners of yellow, magenta, cyan, and black.
Innovation Solution
An electrophotographic toner set comprising a yellow toner, a magenta toner, and a third toner with specific lightness and hue angle ranges in the CIE LAB color space, along with a compound represented by a particular formula, to expand the color reproduction range by optimizing the lightness and hue angle differences between the toners.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If conventional four-color toners (yellow, magenta, cyan, black) are used, then the basic color reproduction function is maintained, but the color reproduction range in intermediate color regions (red, blue, green) from low to high lightness is limited
Solution Approach 1:
The invention segments the color reproduction task by introducing a dedicated third toner for intermediate colors (red, blue, green), separating this function from the primary yellow, magenta, and cyan toners. This allows specialized optimization for intermediate color regions while maintaining the basic color reproduction function of the original four-color system.
Solution Approach 2:
The invention applies local quality by assigning specific lightness and hue angle ranges to the third toner (L*: 50-65, h: 0-65°) that are optimized for intermediate color regions. This localized optimization enhances color reproduction quality specifically in red, blue, and green intermediate areas without altering the properties of the primary color toners.
2Quantity of substance
If a special color toner with appropriate color angle is added, then the color reproduction area is expanded, but the broad color reproduction range from low to high lightness in intermediate regions is still not achieved
Solution Approach 1:
The invention changes the parameters of the third toner specifically to L*: 50-65 and h: 0-65°, which are optimized for intermediate color regions. This parameter optimization enables broad color reproduction range from low to high lightness in red, blue, and green areas, resolving the limitation of conventional special color toners that only expanded area but not lightness range.
3Quantity of substance
If the hue angle difference between yellow and magenta toners is optimized to 120 ± 10°, then red region expansion is achieved, but overall color reproducibility including blue and green regions is not enhanced
Solution Approach 1:
The third toner with L*: 50-65 and h: 0-65° serves multiple functions simultaneously: it enhances red intermediate colors when combined with yellow and magenta, blue intermediate colors when combined with magenta and cyan, and green intermediate colors when combined with cyan and yellow. This multi-functionality achieves overall color reproducibility enhancement across all intermediate regions.
Data Source
AI summary
Disclosed is a toner set for electrophotography, which has good color reproducibility from the low brightness part to the high brightness part in an intermediate color (red) region. Specifically disclosed is a toner set for electrophotography, which is configured of at least a yellow toner, a magenta toner and a third toner for electrophotography. The toner set for electrophotography is characterized in that: the brightness (L*) of the magenta toner is within the range of 35-50 and the brightness (L*) of the third toner for electrophotography is within the range of 50-65 in the CIE LAB color space system, the hue angle of the third toner for electrophotography is within the range of 0-65°; and the hue angle difference between the color produced by the yellow toner and the color produced by the magenta toner is within the range of 114-130°.