Title:
ULTRA CLEAR PRINTING SYSTEM
Document Type and Number:
Japanese Patent JP3842313
Kind Code:
B2
Abstract:
PURPOSE: To improve the halftone processing fidelity of a xerographic printer.
CONSTITUTION: In a halftone circuit 70, gray scale data input 197 decides which one of the 256 pieces of dot planes of a memory 190 is to be accessed. Accumulators 194 and 196 provide the (x) and (y) components of a screen address used for the rotation of a screen and the address information indicates the position of a laser spot 200 on (x) and (y) planes. The respective accumulators provide the memory 190 with most significant 5 bits as (x) and (y) addresses and cyclically roll over at the (x) and (y) and thus, halftone cells are duplicated in a regular two-dimensional array on the entire image area. In the meantime, intensity is changed, a different dot layer is accessed and the density of images is changed. A D/A conversion circuit makes the laser spot possess the intensity required for the rendering of halftone dots based on obtained data.
Inventors:
Douglas N. Curry
Application Number:
JP12820895A
Publication Date:
November 08, 2006
Filing Date:
May 26, 1995
Export Citation:
Assignee:
XEROX CORPORATION
International Classes:
B41J2/52; H04N1/405; G03G21/00; (IPC1-7): H04N1/405; B41J2/52; G03G21/00
Domestic Patent References:
| JP5500589A | ||||
| JP5031958A | ||||
| JP4501798A |
Attorney, Agent or Firm:
Atsushi Nakajima
Kato Kazunori
Kato Kazunori
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