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本文提出了在滚筒式激光束图象记录仪中获得高精度象元的一种方案。避免了由于对象元几何位置精度的高要求,导致对滚筒旋转速度均匀性、正确性的苛求。 文章论述了在滚筒旋转速度均匀性较差的情况下,从装置在滚筒上的传感器取出位置信号,使象素时钟成为空间位置的函数,从而获得象元几何位置的高精度。计算表明,本文提出的方案中,象元几何位置由电子系统引起的误差仅约0.1象元(此时象元直径为25微米)而不需要对扫描电机进行精密的伺服控制。
This paper presents a scheme for obtaining high-precision pixels in a tumbling laser beam image recorder. Avoid high requirements on the accuracy of the geometric position of the object element, resulting in the exactness and correctness of the rotation speed of the drum. The paper discusses the removal of the position signal from the sensor on the drum as a function of the spatial position of the pixel clock, resulting in a high degree of accuracy of the pixel geometry, with poor uniformity of drum rotation speed. The calculation shows that the error of the pixel geometry position caused by the electronic system is only about 0.1 pixel (in this case, the pixel diameter is 25 μm) without the need for precise servo control of the scanning motor.