TRUE ZOOM CAPABILITY ON A SPOT SCANNING ELECTRONIC PRINTER

摘要

A method and apparatus for producing a zoom system within a printer. The zoom system for enlarging or reducing an original image on a printed medium or adjusting aspect ratio of an image. The zoom system utilizing a phase lock loop to produce a pixel clock in a fast scan direction and governing motor control to alter incremental movement of the recording medium in the slow scan direction. Individual pixel size is then governed by varying a frequency of the pixel clock to alter a width of the pixel projected onto the recording medium and length of the pixel is governed by governing overlap of successive print lines and repeating print lines if necessary.