Printer Beam Array Calibration via Dot Pattern Scanning
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Solution Overview
Problem
Current laser printing technologies face challenges in achieving high accuracy and speed due to inconsistencies in beam positioning and timing, particularly with multi-beam systems, where manual visual methods are slow, inaccurate, and less effective as image quality increases and the number of lasers increases.
Innovation Solution
An automated system and method for calibrating a beam array using a dot pattern printed with the beam array, where an optical scanner scans the pattern into an electronic file, and a software module calculates distance calibration errors, generating correction signals to adjust beam timing and drum advancement for precise alignment and spacing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If manual visual methods are used to calibrate beam positioning, then the process is simple to implement, but the accuracy and repeatability of calibration are insufficient
Solution Approach 1:
The patent replaces manual visual calibration methods with an automated optical measurement system. An optical scanner captures images of calibration patterns printed by the beam array, and software algorithms automatically analyze the patterns to calculate positioning errors. This substitution of mechanical/manual operations with optical and computational systems achieves high measurement precision while maintaining manageable system complexity through the use of standard commercial components.
2Productivity
If the number of laser beams is increased to achieve higher printing speeds, then the productivity increases, but the difficulty of detecting and measuring beam alignment errors increases
Solution Approach 1:
The patent uses calibration patterns that are printed by the multi-beam array and then scanned to create digital images. These images serve as copies of the actual beam positions and can be analyzed computationally. The calibration patterns include specific geometric features (such as dot patterns or line patterns) that are designed to be easily detectable and measurable, allowing the system to accurately determine beam positions even when multiple beams are present. This copying approach transforms the physical measurement problem into a digital image analysis problem, making it easier to handle increased numbers of beams.
3Measurement precision
If automated optical scanning is used to measure beam positions, then the measurement precision and repeatability improve, but the device complexity increases
Solution Approach 1:
The patent employs a commercial off-the-shelf optical scanner that can serve multiple functions: it can scan calibration patterns for beam positioning measurement, scan printed documents for copying/scanning purposes, and potentially other imaging tasks. By using a multi-functional device, the system achieves high measurement precision without significantly increasing overall system complexity, as the scanner is already a standardized component with built-in processing capabilities.
Solution Approach 2:
The calibration system uses the printer's own beam array to print the calibration patterns, and then uses those same beams to create the measurement data. The system is self-calibrating in the sense that it uses its own operational components (the laser beams themselves) to generate the calibration data, eliminating the need for external specialized measurement equipment and reducing overall system complexity.
4Manufacturing precision
If correction timing signals are generated to adjust beam timing, then the beam alignment accuracy improves, but the control system complexity increases
Solution Approach 1:
The patent implements a feedback-based calibration system where the measured beam positions from the optical scanner are used to calculate correction timing signals. The software analyzes the captured calibration patterns, determines positioning errors, and generates corrective timing adjustments that are fed back to the beam control system. This closed-loop feedback approach achieves high manufacturing precision through iterative correction while keeping the control system manageable by using standard computational algorithms and software-based control rather than complex hardware control circuits.
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 approach provides repeatable, accurate, and quantitative error correction, enabling higher printing speeds and quality by ensuring precise beam alignment and spacing, overcoming the limitations of manual visual methods.
Implementation Method 1
an optical scanner scans the pattern into an electronic file
Implementation Method 2
Laser printing directs beams of laser light to a photo-conducting drum in order to electro-statically charge the surface of the drum
Implementation Method 3
The laser illuminated drum regions electrostatically attracts toner particles
Data Source
AI summary
A system and method are provided for calibrating a beam array of a printer. The method includes the operation of printing a dot pattern using the beam array of the printer. The dot pattern can then be scanned into an electronic file using an optical scanner. Another operation is calculating distance calibration errors found in the dot pattern in the electronic file using a software module applied to the electronic file.