Spot Size Modulation in Electrophotographic Printer
Original Publication Date: 1989-Jan-01
Included in the Prior Art Database: 2005-Jan-27
Disclosed is an apparatus for varying the size of the spot generated by a scanning light beam by diffracting the beam into one or more output beams displaced in a direction transverse to the scanning direction. The input light beam is diffracted into one or more output beams by passing the input beam through an acousto-optic modulator which is driven by an acoustic wave having one or more frequencies. As shown in Figs. 1 and 2, in an electrophotographic printer, an input light beam is diffracted into one or more output light beams by an acousto-optic modulator. The output light beams are scanned across a photosensor P in a line direction indicated by arrow A. During line scanning, the input light beam is modulated on and off to produce a series of spots on photosensor P.