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首页> 外文会议>International Conference on Digital Printing Technologies: Final Program and Proceedings; 20050918-23; Baltimore,MD(US) >Diagnostic Technique for Real-Time Measurement of Optical and Scan Properties of Optical Printheads
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Diagnostic Technique for Real-Time Measurement of Optical and Scan Properties of Optical Printheads

机译：实时测量光学打印头光学和扫描特性的诊断技术

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摘要

A diagnostic technique has been developed for rapid characterization of optical and scan properties in optical printers. The technique provides simultaneous real-time measures of beam profiles, including spot size, centroid and energy, at all or multiple positions along the print scan line for dynamically moving beams in laser printers or for static optical beams in LED printers. As such, it facilitates adjustments of f-θ lenses in laser printheads with air bearing spindles without the need to stop the polygonal scanning mirror. Also, since an entire raster is measured at once, measurements of the scan line bow and linearity characteristics are obtained in real-time. Polygonal scanner jitter characteristics can be measured in seconds. For LED printheads, it provides for optimal adjustment of lens/array assemblies, and for measurement of the many thousands of LEDs in seconds, yielding linearity, MTF, and power compensation values. When compared to conventional slit-scanning diagnostic methods, the 3 σ measurement accuracy for spot size is slightly less, but the 3 σ centroid accuracy is improved, primarily because there are no moving parts. For instruments using this diagnostic technique, real-time performance yields up to a thousandfold increase in measurement speed, with corresponding reductions in test time, allowing for vast improvement in fabrication tools and in quality control and assurance in printhead manufacturing.
机译：已经开发出一种诊断技术来快速表征光学打印机中的光学和扫描特性。该技术可在沿着打印扫描线的所有或多个位置同时提供光束轮廓的实时测量，包括光斑尺寸，质心和能量，用于激光打印机中的动态移动光束或LED打印机中的静态光束。这样一来，无需停止多角形扫描镜，即可轻松调整带有空气轴承主轴的激光打印头中的f-θ透镜。另外，由于一次测量整个栅格，因此可以实时获得扫描线弯曲度和线性度的测量结果。多边形扫描仪的抖动特性可以在几秒钟内测量。对于LED打印头，它可以优化调整镜头/阵列组件，并在几秒钟内测量成千上万个LED，从而产生线性度，MTF和功率补偿值。与常规狭缝扫描诊断方法相比，光点尺寸的3σ测量精度略低，但3σ质心精度有所提高，这主要是因为没有活动部件。对于使用这种诊断技术的仪器，实时性能可将测量速度提高多达一千倍，并相应地减少了测试时间，从而极大地改善了制造工具，质量控制并确保了打印头的制造。

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