ApplicationNo. 160155 filed on 02/25/1988
US Classes:358/3.09, Print element property varied to effect halftone pattern347/253, By varying intensity of light beam347/254, By varying dotting density358/3.2Screen property or geometry (e.g., shape, period, symmetry, aspect ratio)
ExaminersPrimary: Groody, James J.
Assistant: Svihla, Randall S.
Attorney, Agent or Firm
Foreign Patent References
International ClassH04N 001/40
Foreign Application Priority Data1987-02-27 JP
AbstractApparatus is provided for recording halftone dot images on a photosensitive material by emitting a light beam which is modulated in accordance with digital image data. In a screen pattern memory (23), screen pattern data provided with a value for each element area which is smaller than a light spot diameter of a light beam on a surface of a photosensitive material is stored. The level of a screen pattern signal obtained from the screen pattern data and that of an image signal obtained from digital image data are compared in a comparator (22). An intensity of the light beam is modulated according to a result of comparison in the comparator (22). Because the screen pattern signal is given as a high density signal, the light beam is modulated in each element area which is smaller than a light spot diameter.