Anamorphic Imaging System Synchronization for High-Resolution Laser Scanning
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Solution Overview
Problem
Current laser imaging systems face challenges in achieving high resolution and high power imaging across large areas in a single pass, particularly in applications like lithography and texturing, due to limitations in optical performance, power levels, and hardware constraints, which restrict the ability to maintain image quality and speed.
Innovation Solution
A method involving a spatial light modulator and an anamorphic optical system that synchronizes the movement of the imaging surface with the modulation of a two-dimensional light field, allowing for the generation of a high power, elongated scan image using low-power light sources, and concentrating the light to achieve high optical intensity on a single line, enabling single-pass high resolution and high speed imaging.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If a single laser head motorized x-y flatbed architecture is used for large area coverage, then the imaging area is improved, but the imaging speed becomes too slow for high speed printing processes
Solution Approach 1:
The imaging system is divided into multiple stationary imaging modules (e.g., multiple LED arrays or laser sources) that each cover a portion of the large imaging area. These modules operate simultaneously to achieve both large area coverage and high imaging speed, eliminating the need for slow mechanical scanning of a single head across the entire area.
2Area of stationary object
If monolithic LED arrays are used for large width xerography, then the imaging area is improved, but the power level is limited to 10 milliWatt per pixel which is insufficient for high power applications
Solution Approach 1:
Multiple high-power laser sources are combined into a single imaging system to achieve both large area coverage and high power output. The lasers are spatially arranged and optically combined to illuminate the entire imaging area with sufficient power for applications like laser texturing and cutting, rather than relying on low-power LED arrays.
3Power
If higher power semiconductor laser arrays are used, then the power level is improved, but the laser pitch is incompatible with 600 dpi or higher imaging resolution
Solution Approach 1:
The system transitions from a one-dimensional array of high-power lasers to a two-dimensional spatial light modulator architecture. This allows individual control of each light source element at the required resolution (600 dpi or higher) while maintaining high power capability, as each element in the 2D grid can be independently addressed and controlled.
4Productivity
If two or more rows of staggered heads are used to extend LEDs to higher speeds or resolutions, then the imaging speed and resolution are improved, but the device complexity increases
Solution Approach 1:
A single spatial light modulator device performs multiple functions simultaneously: it provides high-resolution addressing (600 dpi or higher), achieves high imaging speeds through parallel operation of all light source elements, and maintains a compact single-module architecture. This eliminates the need for multiple staggered heads while achieving the same performance benefits.
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 allows for seamless, high-resolution, high-power imaging over large areas without the need for high-intensity light sources, reducing costs and preventing smearing issues, while maintaining high optical intensity and efficiency.
Implementation Method 1
anamorphically imaging and concentrating the modulated light onto an elongated imaging region defined on the imaging surface
Implementation Method 2
modulating a two-dimensional light field in response to predetermined scan image data
Data Source
AI summary
A method for generating an elongated concentrated scan image on an imaging surface of a scan structure (e.g., a drum cylinder) in an imaging (e.g., xerographic or lithographic) apparatus, wherein the imaging surface is caused to move in a cross-scan (process) direction. A spatial light modulator having a two-dimensional array of light modulating elements is used to modulate a two-dimensional light field in response to predetermined scan image data, and then the modulated light is anamorphically imaged and concentrated onto an elongated imaging region defined on the imaging surface. To avoid smearing, movement of the imaging surface is synchronized with the modulated states of the light modulating elements such that image features of the scan image are scrolled (moved in the cross-scan direction) at the same rate as the cross-scan movement of the imaging surface, whereby the features remain coincident with the same portion of the imaging surface.