Image Forming Toner Layering for Invisible-Light Visibility

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Solution Overview

Problem

Existing image forming technologies do not effectively create images that are invisible under visible light but visible under invisible light, such as ultraviolet light, for enhanced engagement in venues like concert halls or aquariums.

Innovation Solution

An image forming apparatus with multiple developing stations and containers, including a first toner with higher luminescence under invisible light and a second toner with higher luminescence under visible light, allows for the superimposition of toners to create images that are visible under invisible light but not visible under visible light.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If a single type of toner is used in the image forming apparatus, then the device complexity is reduced, but the ability to create images with different luminescence characteristics under visible and invisible light is lost

Engineering Contradiction:
Improveability to create images with different luminescence characteristicsVSAvoiddevice complexity
Core Design Contradiction:
Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The image forming apparatus is segmented into multiple developing stations, each equipped with a different type of toner (first toner with higher luminescence under invisible light, second toner with higher luminescence under visible light). This segmentation allows each station to specialize in forming images with specific luminescence characteristics, thereby achieving versatility in creating images that can be selectively visible under different lighting conditions while maintaining manageable device complexity through modular architecture.

Inventive Principle:
Principle #1Segmentation

Solution Approach 2:

The image forming apparatus is designed with multi-functionality by enabling it to produce images with different luminescence characteristics through multiple developing stations. Each station can be selectively activated depending on the desired output, making the apparatus capable of both standard printing and specialized luminescence-based printing, thus achieving adaptability without requiring entirely separate systems.

Inventive Principle:
Principle #6Universality (Multi-functionality)

2Adaptability or versatility

If multiple developing stations with different toners are used, then images with selective visibility under visible and invisible light can be created, but the device complexity increases

Engineering Contradiction:
Improveability to create invisible images visible under ultraviolet lightVSAvoiddevice complexity
Core Design Contradiction:
Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The image forming apparatus employs a nested structure where multiple developing stations are integrated within a single apparatus framework. Each developing station is self-contained with its own toner supply and image formation mechanism, allowing them to be nested within the overall system without requiring separate external systems. This nesting approach enables the creation of images with selective visibility under different light conditions while containing the complexity within a unified device architecture.

Inventive Principle:
Principle #7Nested doll (Nesting)

3Manufacturing precision

If the second toner (higher luminescence under visible light) is applied first and the first toner (higher luminescence under invisible light) is applied second, then the layering process is simplified, but the luminescence intensity under invisible light is reduced

Engineering Contradiction:
Improveluminescence intensity under invisible lightVSAvoidtoner layering process complexity
Core Design Contradiction:
Manufacturing precisionVSEase of manufacture

Solution Approach 1:

The image forming apparatus applies the first toner (with higher luminescence under invisible light) in advance to the print medium, creating a base layer that ensures high luminescence intensity under ultraviolet light. Subsequently, the second toner (with higher luminescence under visible light) is applied on top. This preliminary action of applying the invisible-light-optimized toner first guarantees that the luminescence characteristic is preserved, while the subsequent visible-light toner application enhances overall visibility without compromising the underlying luminescence properties.

Inventive Principle:
Principle #10Preliminary 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

The solution enables the creation of images that enhance visitor engagement by being invisible in bright conditions but visible under ultraviolet light, providing a unique experience in venues.

Implementation Method 1

The second toner has a higher luminescence intensity under invisible light than the first toner. The first toner and the second toner are toners that form an image having a higher luminescence intensity under the invisible light than under visible light.

Methodology Applied
Scientific EffectLuminescence: Luminescence

Data Source

PatentUS12372897B2Image forming apparatus, image forming method, and printed material
Publication Date: 2025.07.29 RICOH CO LTD
  • US12372897B2 patent drawing
  • US12372897B2 patent drawing
  • US12372897B2 patent drawing

AI summary

An image forming apparatus includes an image forming unit and developing containers. The image forming unit includes developing stations to form an image on a print medium with toners, based on input image data. The developing containers contain the toners and are attachable to and detachable from the developing stations. The developing containers include a first developing container containing a first toner and a second developing container containing a second toner having a higher luminescence intensity under invisible light than the first toner. The first toner and the second toner are toners that form an image having a higher luminescence intensity under the invisible light than under visible light. The image forming unit adheres the second toner to the print medium before adhering the first toner when the image forming unit superimposes the first toner and the second toner one atop another on the print medium.