Scanning method and apparatus for banding suppression

A method and apparatus for producing within an imaging area (18) of a charged surface (16) and without significant banding, an array of pixel spots forming image scan lines (20,22) including a start-of-image scan line (20a). The method and apparatus include a ROS (24) for generating an even number o...

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Bibliographic Details
Main Author WONG, LAM F
Format Patent
LanguageEnglish
French
German
Published 30.10.1996
Edition6
Subjects
CALCULATING
COMPUTING
CORRECTION OF TYPOGRAPHICAL ERRORS
COUNTING
ELECTRIC COMMUNICATION TECHNIQUE
ELECTRICITY
HANDLING RECORD CARRIERS
i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME
LINING MACHINES
OPTICAL ELEMENTS, SYSTEMS, OR APPARATUS
OPTICS
PERFORMING OPERATIONS
PHYSICS
PICTORIAL COMMUNICATION, e.g. TELEVISION
PRESENTATION OF DATA
PRINTING
RECOGNITION OF DATA
RECORD CARRIERS
SELECTIVE PRINTING MECHANISMS
STAMPS
TRANSPORTING
TYPEWRITERS
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Summary:A method and apparatus for producing within an imaging area (18) of a charged surface (16) and without significant banding, an array of pixel spots forming image scan lines (20,22) including a start-of-image scan line (20a). The method and apparatus include a ROS (24) for generating an even number of light beams. The ROS includes a rotating polygon assembly (40) having a plural number of facets 'F' for each deflecting the even number of light beams onto the imaging area of the charged surface forming scanning beams for simultaneously each producing an image scan line. The method and apparatus also include a controller (50) for controlling the even number of light beams so that a scanning beam spacing "d" is maintained where "d" is equal to 'F'-1, and so that at start-of-producing the pixel spots forming the image scan lines, the beams are offset relative to the start-of-image scan line and only one-half the even number of light beams is deflected onto the imaging area of the charged surface to each form an image scan line.
Bibliography:Application Number: EP19960302857