公开(公告)号：US4482902A

公开(公告)日：1984-11-13

申请号：US413148

申请日：1982-08-30

申请人： David C. Bailey ,  Lee M. Burberry ,  Donald E. Trimble ,  Andrew M. Bardos ,  Philip M. Perry

发明人： David C. Bailey ,  Lee M. Burberry ,  Donald E. Trimble ,  Andrew M. Bardos ,  Philip M. Perry

IPC分类号： G01D9/42

CPC分类号： G01D9/42

摘要： A high resolution scanning system, employing non-linearly driven galvanometer deflection optics, compensates for both the non-linear rate of travel of the information pixel beam and for pixel position offset introduced by an optical subsystem (a flat field lens) that equalize pixel size and quality across the recording medium. The system employs a single high speed reference clock the output pulses of which are counted and used to address a compensation data-containing PROM (programmable read only memory). The contents of successive addresses of the PROM contain pixel location codes identifying the position on the recording medium where a pixel of interest is to be recorded. These codes are derived in accordance with the periodic non-linear rate of travel of the scanning optics across the recording medium and the measured parameters of a flat field lens disposed in the path of the scanning beam. For a sinusoidal scan, the successive PROM addresses contain pixel location defining codes that are effectively compensate for the non-linearity of the sinusoidal scan rate of the galvanometer deflection drive and the image position offset introduced by the flat field lens optical subsystem. Because of this complementary action, the spacing between pixels can be made constant along a recorded line of pixel data.

摘要翻译： 使用非线性驱动的电流计偏转光学器件的高分辨率扫描系统补偿信息像素束的非线性行进速率和用于平衡像素尺寸的光学子系统（平坦场透镜）引入的像素位置偏移 和质量跨越记录介质。 该系统采用单个高速参考时钟，其输出脉冲被计数并用于寻址包含补偿数据的PROM（可编程只读存储器）。 PROM的连续地址的内容包含识别要记录感兴趣像素的记录介质上的位置的像素位置代码。 这些代码根据扫描光学器件跨越记录介质的周期性非线性行进速率和设置在扫描光束路径中的平坦场透镜的测量参数导出。 对于正弦扫描，连续的PROM地址包含像素位置定义代码，其有效地补偿了电流计偏转驱动器的正弦扫描速率的非线性和由平面场透镜光学子系统引入的图像位置偏移。 由于这种互补作用，像素数据之间的间距可以沿记录的像素数据线变得不变。