| 摘要 |
A roll microfilm printer and method includes preview optics sequentially to scan microfilm images for temporarily recording at least edge location and background density data and printing optics sequentially to print the microfilm images onto plain paper with masking and exposure control based upon the prerecorded data from the preview optics. The preview optics include a sensor board having an array of photo diode sensors to receive a light beam that sequentially passes through microfilm images contained on the moving microfilm strip, the optically sensed data from the images is electronically converted and temporarily recorded for use in subsequently controlling the printing optics. The printing optics includes a high speed mask assembly positioned adjacent the moving microfilm strip, the mask assembly having two high speed stepper motors controlled in accordance with the prerecorded data to drive edge masks toward or away from one another to mask unused image areas. |
