Color Laser Printer Duo-Tone Background Generation
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Solution Overview
Problem
Conventional methods for creating copy-resistant documents require specialized security paper, which is expensive, difficult to store securely, and limits flexibility in changing background patterns, as they often involve offset printing presses and large quantity purchases.
Innovation Solution
A color laser printer system that can combine user-defined foreground data with a copy-resistant duo-tone background on plain paper during a single print job, allowing for on-demand creation of secure documents without the need for pre-printed security paper.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If specialized security paper with pre-printed duo-tone background is used, then copy-resistant background is achieved, but paper cost and storage complexity increase
Solution Approach 1:
The patent applies preliminary action by pre-configuring the printer with a duo-tone background pattern in its memory or firmware. This allows the background to be automatically applied to documents without requiring pre-printed security paper, eliminating the need for specialized paper storage while maintaining copy-resistant background functionality.
Solution Approach 2:
The patent uses copying by creating a digital replica of the duo-tone background pattern that can be reproduced on-demand through the printer. Instead of using physical pre-printed paper, the system creates and applies the background pattern electronically during the printing process, reducing storage requirements and enabling flexible pattern changes.
2Reliability
If pre-printed security paper is used, then copy-resistant background is achieved, but flexibility to change patterns is limited
Solution Approach 1:
The patent applies dynamics by making the background pattern changeable and adaptable through software control. The printer can dynamically adjust the duo-tone background pattern parameters (such as line orientation, spacing, and color distribution) based on user requirements, allowing frequent pattern changes without replacing physical paper supplies.
Solution Approach 2:
The patent uses parameter changes by modifying the digital parameters of the background pattern (such as frequency, amplitude, phase, and color values) to create different duo-tone patterns. This allows the same printing system to produce varied security backgrounds by simply changing the digital parameters rather than requiring different physical paper stocks.
3Reliability
If offset printing press is used for security paper, then copy-resistant background is achieved, but manufacturing cost and quantity requirements increase
Solution Approach 1:
The patent replaces the mechanical offset printing system with a digital printing system. Instead of using expensive offset printing presses that require large quantity purchases to achieve economies of scale, the invention uses a standard laser or inkjet printer that can produce the same duo-tone background pattern through digital image processing, significantly reducing manufacturing cost and eliminating minimum quantity requirements.
Solution Approach 2:
The patent applies parameter changes by transforming the manufacturing approach from physical printing parameters (offset cylinder settings, ink density) to digital parameters (image resolution, color values, pattern frequency). This allows the same security background to be produced at low cost using standard printer hardware by adjusting digital parameters rather than requiring expensive offset printing infrastructure.
4Ease of manufacture
If duo-tone background is printed on plain paper, then cost is reduced, but printing complexity increases
Solution Approach 1:
The patent applies segmentation by dividing the printing process into separate stages: first printing the duo-tone background pattern, then printing the foreground document content over it. This segmentation allows the complex background pattern to be printed as a separate layer, simplifying the overall process by allowing standard printer functionality to handle each component independently while achieving the final composite result.
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
Enables cost-effective, secure, and flexible production of copy-resistant documents by eliminating the need for specialized paper storage and allowing frequent changes in background patterns, enhancing security and reducing inventory costs.
Implementation Method 1
a print engine that applies image-forming material to print media at an image-forming station
Implementation Method 2
a print engine that applies image-forming material to print media at an image-forming station
Data Source
AI summary
An improved printing apparatus and method for its use is provided for printing copy-resistant prismatic, duo-tone patterns as a background on print media. A user or systems administrator can create a copy-resistant background design and store it as a background data file for later use, either on his or her personal computer, or at a secure network server. An authorized user can then create user-defined foreground data to be printed along with the copy-resistant background data, in a single printing operation, using a single printer, and using “blank” print media, such as standard “plain” copy paper. Highly secure documents, such as cashier's checks, thus could be printed in a single print job, without having to purchase and securely store pre-printed check paper.